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source: vbox/trunk/src/libs/libxml2-2.6.30/xpath.c@ 15017

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Merged dmik/s2 branch (r25959:26751) to the trunk.
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1/*
2 * xpath.c: XML Path Language implementation
3 * XPath is a language for addressing parts of an XML document,
4 * designed to be used by both XSLT and XPointer
5 *f
6 * Reference: W3C Recommendation 16 November 1999
7 * http://www.w3.org/TR/1999/REC-xpath-19991116
8 * Public reference:
9 * http://www.w3.org/TR/xpath
10 *
11 * See Copyright for the status of this software
12 *
13 * Author: [email protected]
14 *
15 */
16
17#define IN_LIBXML
18#include "libxml.h"
19
20#include <string.h>
21
22#ifdef HAVE_SYS_TYPES_H
23#include <sys/types.h>
24#endif
25#ifdef HAVE_MATH_H
26#include <math.h>
27#endif
28#ifdef HAVE_FLOAT_H
29#include <float.h>
30#endif
31#ifdef HAVE_CTYPE_H
32#include <ctype.h>
33#endif
34#ifdef HAVE_SIGNAL_H
35#include <signal.h>
36#endif
37
38#include <libxml/xmlmemory.h>
39#include <libxml/tree.h>
40#include <libxml/valid.h>
41#include <libxml/xpath.h>
42#include <libxml/xpathInternals.h>
43#include <libxml/parserInternals.h>
44#include <libxml/hash.h>
45#ifdef LIBXML_XPTR_ENABLED
46#include <libxml/xpointer.h>
47#endif
48#ifdef LIBXML_DEBUG_ENABLED
49#include <libxml/debugXML.h>
50#endif
51#include <libxml/xmlerror.h>
52#include <libxml/threads.h>
53#include <libxml/globals.h>
54#ifdef LIBXML_PATTERN_ENABLED
55#include <libxml/pattern.h>
56#endif
57
58#ifdef LIBXML_PATTERN_ENABLED
59#define XPATH_STREAMING
60#endif
61
62#define TODO \
63 xmlGenericError(xmlGenericErrorContext, \
64 "Unimplemented block at %s:%d\n", \
65 __FILE__, __LINE__);
66
67/*
68* XP_OPTIMIZED_NON_ELEM_COMPARISON:
69* If defined, this will use xmlXPathCmpNodesExt() instead of
70* xmlXPathCmpNodes(). The new function is optimized comparison of
71* non-element nodes; actually it will speed up comparison only if
72* xmlXPathOrderDocElems() was called in order to index the elements of
73* a tree in document order; Libxslt does such an indexing, thus it will
74* benefit from this optimization.
75*/
76#define XP_OPTIMIZED_NON_ELEM_COMPARISON
77
78/*
79* XP_OPTIMIZED_FILTER_FIRST:
80* If defined, this will optimize expressions like "key('foo', 'val')[b][1]"
81* in a way, that it stop evaluation at the first node.
82*/
83#define XP_OPTIMIZED_FILTER_FIRST
84
85/*
86* XP_DEBUG_OBJ_USAGE:
87* Internal flag to enable tracking of how much XPath objects have been
88* created.
89*/
90/* #define XP_DEBUG_OBJ_USAGE */
91
92/*
93 * TODO:
94 * There are a few spots where some tests are done which depend upon ascii
95 * data. These should be enhanced for full UTF8 support (see particularly
96 * any use of the macros IS_ASCII_CHARACTER and IS_ASCII_DIGIT)
97 */
98
99#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
100
101/************************************************************************
102 * *
103 * Floating point stuff *
104 * *
105 ************************************************************************/
106
107#ifndef TRIO_REPLACE_STDIO
108#define TRIO_PUBLIC static
109#endif
110#include "trionan.c"
111
112/*
113 * The lack of portability of this section of the libc is annoying !
114 */
115double xmlXPathNAN = 0;
116double xmlXPathPINF = 1;
117double xmlXPathNINF = -1;
118static double xmlXPathNZERO = 0; /* not exported from headers */
119static int xmlXPathInitialized = 0;
120
121/**
122 * xmlXPathInit:
123 *
124 * Initialize the XPath environment
125 */
126void
127xmlXPathInit(void) {
128 if (xmlXPathInitialized) return;
129
130 xmlXPathPINF = trio_pinf();
131 xmlXPathNINF = trio_ninf();
132 xmlXPathNAN = trio_nan();
133 xmlXPathNZERO = trio_nzero();
134
135 xmlXPathInitialized = 1;
136}
137
138/**
139 * xmlXPathIsNaN:
140 * @val: a double value
141 *
142 * Provides a portable isnan() function to detect whether a double
143 * is a NotaNumber. Based on trio code
144 * http://sourceforge.net/projects/ctrio/
145 *
146 * Returns 1 if the value is a NaN, 0 otherwise
147 */
148int
149xmlXPathIsNaN(double val) {
150 return(trio_isnan(val));
151}
152
153/**
154 * xmlXPathIsInf:
155 * @val: a double value
156 *
157 * Provides a portable isinf() function to detect whether a double
158 * is a +Infinite or -Infinite. Based on trio code
159 * http://sourceforge.net/projects/ctrio/
160 *
161 * Returns 1 vi the value is +Infinite, -1 if -Infinite, 0 otherwise
162 */
163int
164xmlXPathIsInf(double val) {
165 return(trio_isinf(val));
166}
167
168#endif /* SCHEMAS or XPATH */
169#ifdef LIBXML_XPATH_ENABLED
170/**
171 * xmlXPathGetSign:
172 * @val: a double value
173 *
174 * Provides a portable function to detect the sign of a double
175 * Modified from trio code
176 * http://sourceforge.net/projects/ctrio/
177 *
178 * Returns 1 if the value is Negative, 0 if positive
179 */
180static int
181xmlXPathGetSign(double val) {
182 return(trio_signbit(val));
183}
184
185
186/*
187 * TODO: when compatibility allows remove all "fake node libxslt" strings
188 * the test should just be name[0] = ' '
189 */
190/* #define DEBUG */
191/* #define DEBUG_STEP */
192/* #define DEBUG_STEP_NTH */
193/* #define DEBUG_EXPR */
194/* #define DEBUG_EVAL_COUNTS */
195
196static xmlNs xmlXPathXMLNamespaceStruct = {
197 NULL,
198 XML_NAMESPACE_DECL,
199 XML_XML_NAMESPACE,
200 BAD_CAST "xml",
201 NULL,
202 NULL
203};
204static xmlNsPtr xmlXPathXMLNamespace = &xmlXPathXMLNamespaceStruct;
205#ifndef LIBXML_THREAD_ENABLED
206/*
207 * Optimizer is disabled only when threaded apps are detected while
208 * the library ain't compiled for thread safety.
209 */
210static int xmlXPathDisableOptimizer = 0;
211#endif
212
213/************************************************************************
214 * *
215 * Error handling routines *
216 * *
217 ************************************************************************/
218
219/**
220 * XP_ERRORNULL:
221 * @X: the error code
222 *
223 * Macro to raise an XPath error and return NULL.
224 */
225#define XP_ERRORNULL(X) \
226 { xmlXPathErr(ctxt, X); return(NULL); }
227
228/*
229 * The array xmlXPathErrorMessages corresponds to the enum xmlXPathError
230 */
231static const char *xmlXPathErrorMessages[] = {
232 "Ok\n",
233 "Number encoding\n",
234 "Unfinished literal\n",
235 "Start of literal\n",
236 "Expected $ for variable reference\n",
237 "Undefined variable\n",
238 "Invalid predicate\n",
239 "Invalid expression\n",
240 "Missing closing curly brace\n",
241 "Unregistered function\n",
242 "Invalid operand\n",
243 "Invalid type\n",
244 "Invalid number of arguments\n",
245 "Invalid context size\n",
246 "Invalid context position\n",
247 "Memory allocation error\n",
248 "Syntax error\n",
249 "Resource error\n",
250 "Sub resource error\n",
251 "Undefined namespace prefix\n",
252 "Encoding error\n",
253 "Char out of XML range\n",
254 "Invalid or incomplete context\n",
255 "?? Unknown error ??\n" /* Must be last in the list! */
256};
257#define MAXERRNO ((int)(sizeof(xmlXPathErrorMessages) / \
258 sizeof(xmlXPathErrorMessages[0])) - 1)
259/**
260 * xmlXPathErrMemory:
261 * @ctxt: an XPath context
262 * @extra: extra informations
263 *
264 * Handle a redefinition of attribute error
265 */
266static void
267xmlXPathErrMemory(xmlXPathContextPtr ctxt, const char *extra)
268{
269 if (ctxt != NULL) {
270 if (extra) {
271 xmlChar buf[200];
272
273 xmlStrPrintf(buf, 200,
274 BAD_CAST "Memory allocation failed : %s\n",
275 extra);
276 ctxt->lastError.message = (char *) xmlStrdup(buf);
277 } else {
278 ctxt->lastError.message = (char *)
279 xmlStrdup(BAD_CAST "Memory allocation failed\n");
280 }
281 ctxt->lastError.domain = XML_FROM_XPATH;
282 ctxt->lastError.code = XML_ERR_NO_MEMORY;
283 if (ctxt->error != NULL)
284 ctxt->error(ctxt->userData, &ctxt->lastError);
285 } else {
286 if (extra)
287 __xmlRaiseError(NULL, NULL, NULL,
288 NULL, NULL, XML_FROM_XPATH,
289 XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0,
290 extra, NULL, NULL, 0, 0,
291 "Memory allocation failed : %s\n", extra);
292 else
293 __xmlRaiseError(NULL, NULL, NULL,
294 NULL, NULL, XML_FROM_XPATH,
295 XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0,
296 NULL, NULL, NULL, 0, 0,
297 "Memory allocation failed\n");
298 }
299}
300
301/**
302 * xmlXPathPErrMemory:
303 * @ctxt: an XPath parser context
304 * @extra: extra informations
305 *
306 * Handle a redefinition of attribute error
307 */
308static void
309xmlXPathPErrMemory(xmlXPathParserContextPtr ctxt, const char *extra)
310{
311 if (ctxt == NULL)
312 xmlXPathErrMemory(NULL, extra);
313 else {
314 ctxt->error = XPATH_MEMORY_ERROR;
315 xmlXPathErrMemory(ctxt->context, extra);
316 }
317}
318
319/**
320 * xmlXPathErr:
321 * @ctxt: a XPath parser context
322 * @error: the error code
323 *
324 * Handle an XPath error
325 */
326void
327xmlXPathErr(xmlXPathParserContextPtr ctxt, int error)
328{
329 if ((error < 0) || (error > MAXERRNO))
330 error = MAXERRNO;
331 if (ctxt == NULL) {
332 __xmlRaiseError(NULL, NULL, NULL,
333 NULL, NULL, XML_FROM_XPATH,
334 error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK,
335 XML_ERR_ERROR, NULL, 0,
336 NULL, NULL, NULL, 0, 0,
337 xmlXPathErrorMessages[error]);
338 return;
339 }
340 ctxt->error = error;
341 if (ctxt->context == NULL) {
342 __xmlRaiseError(NULL, NULL, NULL,
343 NULL, NULL, XML_FROM_XPATH,
344 error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK,
345 XML_ERR_ERROR, NULL, 0,
346 (const char *) ctxt->base, NULL, NULL,
347 ctxt->cur - ctxt->base, 0,
348 xmlXPathErrorMessages[error]);
349 return;
350 }
351
352 /* cleanup current last error */
353 xmlResetError(&ctxt->context->lastError);
354
355 ctxt->context->lastError.domain = XML_FROM_XPATH;
356 ctxt->context->lastError.code = error + XML_XPATH_EXPRESSION_OK -
357 XPATH_EXPRESSION_OK;
358 ctxt->context->lastError.level = XML_ERR_ERROR;
359 ctxt->context->lastError.str1 = (char *) xmlStrdup(ctxt->base);
360 ctxt->context->lastError.int1 = ctxt->cur - ctxt->base;
361 ctxt->context->lastError.node = ctxt->context->debugNode;
362 if (ctxt->context->error != NULL) {
363 ctxt->context->error(ctxt->context->userData,
364 &ctxt->context->lastError);
365 } else {
366 __xmlRaiseError(NULL, NULL, NULL,
367 NULL, ctxt->context->debugNode, XML_FROM_XPATH,
368 error + XML_XPATH_EXPRESSION_OK - XPATH_EXPRESSION_OK,
369 XML_ERR_ERROR, NULL, 0,
370 (const char *) ctxt->base, NULL, NULL,
371 ctxt->cur - ctxt->base, 0,
372 xmlXPathErrorMessages[error]);
373 }
374
375}
376
377/**
378 * xmlXPatherror:
379 * @ctxt: the XPath Parser context
380 * @file: the file name
381 * @line: the line number
382 * @no: the error number
383 *
384 * Formats an error message.
385 */
386void
387xmlXPatherror(xmlXPathParserContextPtr ctxt, const char *file ATTRIBUTE_UNUSED,
388 int line ATTRIBUTE_UNUSED, int no) {
389 xmlXPathErr(ctxt, no);
390}
391
392/************************************************************************
393 * *
394 * Utilities *
395 * *
396 ************************************************************************/
397
398/**
399 * xsltPointerList:
400 *
401 * Pointer-list for various purposes.
402 */
403typedef struct _xmlPointerList xmlPointerList;
404typedef xmlPointerList *xmlPointerListPtr;
405struct _xmlPointerList {
406 void **items;
407 int number;
408 int size;
409};
410/*
411* TODO: Since such a list-handling is used in xmlschemas.c and libxslt
412* and here, we should make the functions public.
413*/
414static int
415xmlPointerListAddSize(xmlPointerListPtr list,
416 void *item,
417 int initialSize)
418{
419 if (list->items == NULL) {
420 if (initialSize <= 0)
421 initialSize = 1;
422 list->items = (void **) xmlMalloc(
423 initialSize * sizeof(void *));
424 if (list->items == NULL) {
425 xmlXPathErrMemory(NULL,
426 "xmlPointerListCreate: allocating item\n");
427 return(-1);
428 }
429 list->number = 0;
430 list->size = initialSize;
431 } else if (list->size <= list->number) {
432 list->size *= 2;
433 list->items = (void **) xmlRealloc(list->items,
434 list->size * sizeof(void *));
435 if (list->items == NULL) {
436 xmlXPathErrMemory(NULL,
437 "xmlPointerListCreate: re-allocating item\n");
438 list->size = 0;
439 return(-1);
440 }
441 }
442 list->items[list->number++] = item;
443 return(0);
444}
445
446/**
447 * xsltPointerListCreate:
448 *
449 * Creates an xsltPointerList structure.
450 *
451 * Returns a xsltPointerList structure or NULL in case of an error.
452 */
453static xmlPointerListPtr
454xmlPointerListCreate(int initialSize)
455{
456 xmlPointerListPtr ret;
457
458 ret = xmlMalloc(sizeof(xmlPointerList));
459 if (ret == NULL) {
460 xmlXPathErrMemory(NULL,
461 "xmlPointerListCreate: allocating item\n");
462 return (NULL);
463 }
464 memset(ret, 0, sizeof(xmlPointerList));
465 if (initialSize > 0) {
466 xmlPointerListAddSize(ret, NULL, initialSize);
467 ret->number = 0;
468 }
469 return (ret);
470}
471
472/**
473 * xsltPointerListFree:
474 *
475 * Frees the xsltPointerList structure. This does not free
476 * the content of the list.
477 */
478static void
479xmlPointerListFree(xmlPointerListPtr list)
480{
481 if (list == NULL)
482 return;
483 if (list->items != NULL)
484 xmlFree(list->items);
485 xmlFree(list);
486}
487
488/************************************************************************
489 * *
490 * Parser Types *
491 * *
492 ************************************************************************/
493
494/*
495 * Types are private:
496 */
497
498typedef enum {
499 XPATH_OP_END=0,
500 XPATH_OP_AND,
501 XPATH_OP_OR,
502 XPATH_OP_EQUAL,
503 XPATH_OP_CMP,
504 XPATH_OP_PLUS,
505 XPATH_OP_MULT,
506 XPATH_OP_UNION,
507 XPATH_OP_ROOT,
508 XPATH_OP_NODE,
509 XPATH_OP_RESET, /* 10 */
510 XPATH_OP_COLLECT,
511 XPATH_OP_VALUE, /* 12 */
512 XPATH_OP_VARIABLE,
513 XPATH_OP_FUNCTION,
514 XPATH_OP_ARG,
515 XPATH_OP_PREDICATE,
516 XPATH_OP_FILTER, /* 17 */
517 XPATH_OP_SORT /* 18 */
518#ifdef LIBXML_XPTR_ENABLED
519 ,XPATH_OP_RANGETO
520#endif
521} xmlXPathOp;
522
523typedef enum {
524 AXIS_ANCESTOR = 1,
525 AXIS_ANCESTOR_OR_SELF,
526 AXIS_ATTRIBUTE,
527 AXIS_CHILD,
528 AXIS_DESCENDANT,
529 AXIS_DESCENDANT_OR_SELF,
530 AXIS_FOLLOWING,
531 AXIS_FOLLOWING_SIBLING,
532 AXIS_NAMESPACE,
533 AXIS_PARENT,
534 AXIS_PRECEDING,
535 AXIS_PRECEDING_SIBLING,
536 AXIS_SELF
537} xmlXPathAxisVal;
538
539typedef enum {
540 NODE_TEST_NONE = 0,
541 NODE_TEST_TYPE = 1,
542 NODE_TEST_PI = 2,
543 NODE_TEST_ALL = 3,
544 NODE_TEST_NS = 4,
545 NODE_TEST_NAME = 5
546} xmlXPathTestVal;
547
548typedef enum {
549 NODE_TYPE_NODE = 0,
550 NODE_TYPE_COMMENT = XML_COMMENT_NODE,
551 NODE_TYPE_TEXT = XML_TEXT_NODE,
552 NODE_TYPE_PI = XML_PI_NODE
553} xmlXPathTypeVal;
554
555#define XP_REWRITE_DOS_CHILD_ELEM 1
556
557typedef struct _xmlXPathStepOp xmlXPathStepOp;
558typedef xmlXPathStepOp *xmlXPathStepOpPtr;
559struct _xmlXPathStepOp {
560 xmlXPathOp op; /* The identifier of the operation */
561 int ch1; /* First child */
562 int ch2; /* Second child */
563 int value;
564 int value2;
565 int value3;
566 void *value4;
567 void *value5;
568 void *cache;
569 void *cacheURI;
570 int rewriteType;
571};
572
573struct _xmlXPathCompExpr {
574 int nbStep; /* Number of steps in this expression */
575 int maxStep; /* Maximum number of steps allocated */
576 xmlXPathStepOp *steps; /* ops for computation of this expression */
577 int last; /* index of last step in expression */
578 xmlChar *expr; /* the expression being computed */
579 xmlDictPtr dict; /* the dictionnary to use if any */
580#ifdef DEBUG_EVAL_COUNTS
581 int nb;
582 xmlChar *string;
583#endif
584#ifdef XPATH_STREAMING
585 xmlPatternPtr stream;
586#endif
587};
588
589/************************************************************************
590 * *
591 * Forward declarations *
592 * *
593 ************************************************************************/
594static void
595xmlXPathFreeValueTree(xmlNodeSetPtr obj);
596static void
597xmlXPathReleaseObject(xmlXPathContextPtr ctxt, xmlXPathObjectPtr obj);
598static int
599xmlXPathCompOpEvalFirst(xmlXPathParserContextPtr ctxt,
600 xmlXPathStepOpPtr op, xmlNodePtr *first);
601static int
602xmlXPathCompOpEvalToBoolean(xmlXPathParserContextPtr ctxt,
603 xmlXPathStepOpPtr op,
604 int isPredicate);
605
606/************************************************************************
607 * *
608 * Parser Type functions *
609 * *
610 ************************************************************************/
611
612/**
613 * xmlXPathNewCompExpr:
614 *
615 * Create a new Xpath component
616 *
617 * Returns the newly allocated xmlXPathCompExprPtr or NULL in case of error
618 */
619static xmlXPathCompExprPtr
620xmlXPathNewCompExpr(void) {
621 xmlXPathCompExprPtr cur;
622
623 cur = (xmlXPathCompExprPtr) xmlMalloc(sizeof(xmlXPathCompExpr));
624 if (cur == NULL) {
625 xmlXPathErrMemory(NULL, "allocating component\n");
626 return(NULL);
627 }
628 memset(cur, 0, sizeof(xmlXPathCompExpr));
629 cur->maxStep = 10;
630 cur->nbStep = 0;
631 cur->steps = (xmlXPathStepOp *) xmlMalloc(cur->maxStep *
632 sizeof(xmlXPathStepOp));
633 if (cur->steps == NULL) {
634 xmlXPathErrMemory(NULL, "allocating steps\n");
635 xmlFree(cur);
636 return(NULL);
637 }
638 memset(cur->steps, 0, cur->maxStep * sizeof(xmlXPathStepOp));
639 cur->last = -1;
640#ifdef DEBUG_EVAL_COUNTS
641 cur->nb = 0;
642#endif
643 return(cur);
644}
645
646/**
647 * xmlXPathFreeCompExpr:
648 * @comp: an XPATH comp
649 *
650 * Free up the memory allocated by @comp
651 */
652void
653xmlXPathFreeCompExpr(xmlXPathCompExprPtr comp)
654{
655 xmlXPathStepOpPtr op;
656 int i;
657
658 if (comp == NULL)
659 return;
660 if (comp->dict == NULL) {
661 for (i = 0; i < comp->nbStep; i++) {
662 op = &comp->steps[i];
663 if (op->value4 != NULL) {
664 if (op->op == XPATH_OP_VALUE)
665 xmlXPathFreeObject(op->value4);
666 else
667 xmlFree(op->value4);
668 }
669 if (op->value5 != NULL)
670 xmlFree(op->value5);
671 }
672 } else {
673 for (i = 0; i < comp->nbStep; i++) {
674 op = &comp->steps[i];
675 if (op->value4 != NULL) {
676 if (op->op == XPATH_OP_VALUE)
677 xmlXPathFreeObject(op->value4);
678 }
679 }
680 xmlDictFree(comp->dict);
681 }
682 if (comp->steps != NULL) {
683 xmlFree(comp->steps);
684 }
685#ifdef DEBUG_EVAL_COUNTS
686 if (comp->string != NULL) {
687 xmlFree(comp->string);
688 }
689#endif
690#ifdef XPATH_STREAMING
691 if (comp->stream != NULL) {
692 xmlFreePatternList(comp->stream);
693 }
694#endif
695 if (comp->expr != NULL) {
696 xmlFree(comp->expr);
697 }
698
699 xmlFree(comp);
700}
701
702/**
703 * xmlXPathCompExprAdd:
704 * @comp: the compiled expression
705 * @ch1: first child index
706 * @ch2: second child index
707 * @op: an op
708 * @value: the first int value
709 * @value2: the second int value
710 * @value3: the third int value
711 * @value4: the first string value
712 * @value5: the second string value
713 *
714 * Add a step to an XPath Compiled Expression
715 *
716 * Returns -1 in case of failure, the index otherwise
717 */
718static int
719xmlXPathCompExprAdd(xmlXPathCompExprPtr comp, int ch1, int ch2,
720 xmlXPathOp op, int value,
721 int value2, int value3, void *value4, void *value5) {
722 if (comp->nbStep >= comp->maxStep) {
723 xmlXPathStepOp *real;
724
725 comp->maxStep *= 2;
726 real = (xmlXPathStepOp *) xmlRealloc(comp->steps,
727 comp->maxStep * sizeof(xmlXPathStepOp));
728 if (real == NULL) {
729 comp->maxStep /= 2;
730 xmlXPathErrMemory(NULL, "adding step\n");
731 return(-1);
732 }
733 comp->steps = real;
734 }
735 comp->last = comp->nbStep;
736 comp->steps[comp->nbStep].rewriteType = 0;
737 comp->steps[comp->nbStep].ch1 = ch1;
738 comp->steps[comp->nbStep].ch2 = ch2;
739 comp->steps[comp->nbStep].op = op;
740 comp->steps[comp->nbStep].value = value;
741 comp->steps[comp->nbStep].value2 = value2;
742 comp->steps[comp->nbStep].value3 = value3;
743 if ((comp->dict != NULL) &&
744 ((op == XPATH_OP_FUNCTION) || (op == XPATH_OP_VARIABLE) ||
745 (op == XPATH_OP_COLLECT))) {
746 if (value4 != NULL) {
747 comp->steps[comp->nbStep].value4 = (xmlChar *)
748 (void *)xmlDictLookup(comp->dict, value4, -1);
749 xmlFree(value4);
750 } else
751 comp->steps[comp->nbStep].value4 = NULL;
752 if (value5 != NULL) {
753 comp->steps[comp->nbStep].value5 = (xmlChar *)
754 (void *)xmlDictLookup(comp->dict, value5, -1);
755 xmlFree(value5);
756 } else
757 comp->steps[comp->nbStep].value5 = NULL;
758 } else {
759 comp->steps[comp->nbStep].value4 = value4;
760 comp->steps[comp->nbStep].value5 = value5;
761 }
762 comp->steps[comp->nbStep].cache = NULL;
763 return(comp->nbStep++);
764}
765
766/**
767 * xmlXPathCompSwap:
768 * @comp: the compiled expression
769 * @op: operation index
770 *
771 * Swaps 2 operations in the compiled expression
772 */
773static void
774xmlXPathCompSwap(xmlXPathStepOpPtr op) {
775 int tmp;
776
777#ifndef LIBXML_THREAD_ENABLED
778 /*
779 * Since this manipulates possibly shared variables, this is
780 * disabled if one detects that the library is used in a multithreaded
781 * application
782 */
783 if (xmlXPathDisableOptimizer)
784 return;
785#endif
786
787 tmp = op->ch1;
788 op->ch1 = op->ch2;
789 op->ch2 = tmp;
790}
791
792#define PUSH_FULL_EXPR(op, op1, op2, val, val2, val3, val4, val5) \
793 xmlXPathCompExprAdd(ctxt->comp, (op1), (op2), \
794 (op), (val), (val2), (val3), (val4), (val5))
795#define PUSH_LONG_EXPR(op, val, val2, val3, val4, val5) \
796 xmlXPathCompExprAdd(ctxt->comp, ctxt->comp->last, -1, \
797 (op), (val), (val2), (val3), (val4), (val5))
798
799#define PUSH_LEAVE_EXPR(op, val, val2) \
800xmlXPathCompExprAdd(ctxt->comp, -1, -1, (op), (val), (val2), 0 ,NULL ,NULL)
801
802#define PUSH_UNARY_EXPR(op, ch, val, val2) \
803xmlXPathCompExprAdd(ctxt->comp, (ch), -1, (op), (val), (val2), 0 ,NULL ,NULL)
804
805#define PUSH_BINARY_EXPR(op, ch1, ch2, val, val2) \
806xmlXPathCompExprAdd(ctxt->comp, (ch1), (ch2), (op), \
807 (val), (val2), 0 ,NULL ,NULL)
808
809/************************************************************************
810 * *
811 * XPath object cache structures *
812 * *
813 ************************************************************************/
814
815/* #define XP_DEFAULT_CACHE_ON */
816
817#define XP_HAS_CACHE(c) ((c != NULL) && ((c)->cache != NULL))
818
819typedef struct _xmlXPathContextCache xmlXPathContextCache;
820typedef xmlXPathContextCache *xmlXPathContextCachePtr;
821struct _xmlXPathContextCache {
822 xmlPointerListPtr nodesetObjs; /* contains xmlXPathObjectPtr */
823 xmlPointerListPtr stringObjs; /* contains xmlXPathObjectPtr */
824 xmlPointerListPtr booleanObjs; /* contains xmlXPathObjectPtr */
825 xmlPointerListPtr numberObjs; /* contains xmlXPathObjectPtr */
826 xmlPointerListPtr miscObjs; /* contains xmlXPathObjectPtr */
827 int maxNodeset;
828 int maxString;
829 int maxBoolean;
830 int maxNumber;
831 int maxMisc;
832#ifdef XP_DEBUG_OBJ_USAGE
833 int dbgCachedAll;
834 int dbgCachedNodeset;
835 int dbgCachedString;
836 int dbgCachedBool;
837 int dbgCachedNumber;
838 int dbgCachedPoint;
839 int dbgCachedRange;
840 int dbgCachedLocset;
841 int dbgCachedUsers;
842 int dbgCachedXSLTTree;
843 int dbgCachedUndefined;
844
845
846 int dbgReusedAll;
847 int dbgReusedNodeset;
848 int dbgReusedString;
849 int dbgReusedBool;
850 int dbgReusedNumber;
851 int dbgReusedPoint;
852 int dbgReusedRange;
853 int dbgReusedLocset;
854 int dbgReusedUsers;
855 int dbgReusedXSLTTree;
856 int dbgReusedUndefined;
857
858#endif
859};
860
861/************************************************************************
862 * *
863 * Debugging related functions *
864 * *
865 ************************************************************************/
866
867#define STRANGE \
868 xmlGenericError(xmlGenericErrorContext, \
869 "Internal error at %s:%d\n", \
870 __FILE__, __LINE__);
871
872#ifdef LIBXML_DEBUG_ENABLED
873static void
874xmlXPathDebugDumpNode(FILE *output, xmlNodePtr cur, int depth) {
875 int i;
876 char shift[100];
877
878 for (i = 0;((i < depth) && (i < 25));i++)
879 shift[2 * i] = shift[2 * i + 1] = ' ';
880 shift[2 * i] = shift[2 * i + 1] = 0;
881 if (cur == NULL) {
882 fprintf(output, shift);
883 fprintf(output, "Node is NULL !\n");
884 return;
885
886 }
887
888 if ((cur->type == XML_DOCUMENT_NODE) ||
889 (cur->type == XML_HTML_DOCUMENT_NODE)) {
890 fprintf(output, shift);
891 fprintf(output, " /\n");
892 } else if (cur->type == XML_ATTRIBUTE_NODE)
893 xmlDebugDumpAttr(output, (xmlAttrPtr)cur, depth);
894 else
895 xmlDebugDumpOneNode(output, cur, depth);
896}
897static void
898xmlXPathDebugDumpNodeList(FILE *output, xmlNodePtr cur, int depth) {
899 xmlNodePtr tmp;
900 int i;
901 char shift[100];
902
903 for (i = 0;((i < depth) && (i < 25));i++)
904 shift[2 * i] = shift[2 * i + 1] = ' ';
905 shift[2 * i] = shift[2 * i + 1] = 0;
906 if (cur == NULL) {
907 fprintf(output, shift);
908 fprintf(output, "Node is NULL !\n");
909 return;
910
911 }
912
913 while (cur != NULL) {
914 tmp = cur;
915 cur = cur->next;
916 xmlDebugDumpOneNode(output, tmp, depth);
917 }
918}
919
920static void
921xmlXPathDebugDumpNodeSet(FILE *output, xmlNodeSetPtr cur, int depth) {
922 int i;
923 char shift[100];
924
925 for (i = 0;((i < depth) && (i < 25));i++)
926 shift[2 * i] = shift[2 * i + 1] = ' ';
927 shift[2 * i] = shift[2 * i + 1] = 0;
928
929 if (cur == NULL) {
930 fprintf(output, shift);
931 fprintf(output, "NodeSet is NULL !\n");
932 return;
933
934 }
935
936 if (cur != NULL) {
937 fprintf(output, "Set contains %d nodes:\n", cur->nodeNr);
938 for (i = 0;i < cur->nodeNr;i++) {
939 fprintf(output, shift);
940 fprintf(output, "%d", i + 1);
941 xmlXPathDebugDumpNode(output, cur->nodeTab[i], depth + 1);
942 }
943 }
944}
945
946static void
947xmlXPathDebugDumpValueTree(FILE *output, xmlNodeSetPtr cur, int depth) {
948 int i;
949 char shift[100];
950
951 for (i = 0;((i < depth) && (i < 25));i++)
952 shift[2 * i] = shift[2 * i + 1] = ' ';
953 shift[2 * i] = shift[2 * i + 1] = 0;
954
955 if ((cur == NULL) || (cur->nodeNr == 0) || (cur->nodeTab[0] == NULL)) {
956 fprintf(output, shift);
957 fprintf(output, "Value Tree is NULL !\n");
958 return;
959
960 }
961
962 fprintf(output, shift);
963 fprintf(output, "%d", i + 1);
964 xmlXPathDebugDumpNodeList(output, cur->nodeTab[0]->children, depth + 1);
965}
966#if defined(LIBXML_XPTR_ENABLED)
967static void
968xmlXPathDebugDumpLocationSet(FILE *output, xmlLocationSetPtr cur, int depth) {
969 int i;
970 char shift[100];
971
972 for (i = 0;((i < depth) && (i < 25));i++)
973 shift[2 * i] = shift[2 * i + 1] = ' ';
974 shift[2 * i] = shift[2 * i + 1] = 0;
975
976 if (cur == NULL) {
977 fprintf(output, shift);
978 fprintf(output, "LocationSet is NULL !\n");
979 return;
980
981 }
982
983 for (i = 0;i < cur->locNr;i++) {
984 fprintf(output, shift);
985 fprintf(output, "%d : ", i + 1);
986 xmlXPathDebugDumpObject(output, cur->locTab[i], depth + 1);
987 }
988}
989#endif /* LIBXML_XPTR_ENABLED */
990
991/**
992 * xmlXPathDebugDumpObject:
993 * @output: the FILE * to dump the output
994 * @cur: the object to inspect
995 * @depth: indentation level
996 *
997 * Dump the content of the object for debugging purposes
998 */
999void
1000xmlXPathDebugDumpObject(FILE *output, xmlXPathObjectPtr cur, int depth) {
1001 int i;
1002 char shift[100];
1003
1004 if (output == NULL) return;
1005
1006 for (i = 0;((i < depth) && (i < 25));i++)
1007 shift[2 * i] = shift[2 * i + 1] = ' ';
1008 shift[2 * i] = shift[2 * i + 1] = 0;
1009
1010
1011 fprintf(output, shift);
1012
1013 if (cur == NULL) {
1014 fprintf(output, "Object is empty (NULL)\n");
1015 return;
1016 }
1017 switch(cur->type) {
1018 case XPATH_UNDEFINED:
1019 fprintf(output, "Object is uninitialized\n");
1020 break;
1021 case XPATH_NODESET:
1022 fprintf(output, "Object is a Node Set :\n");
1023 xmlXPathDebugDumpNodeSet(output, cur->nodesetval, depth);
1024 break;
1025 case XPATH_XSLT_TREE:
1026 fprintf(output, "Object is an XSLT value tree :\n");
1027 xmlXPathDebugDumpValueTree(output, cur->nodesetval, depth);
1028 break;
1029 case XPATH_BOOLEAN:
1030 fprintf(output, "Object is a Boolean : ");
1031 if (cur->boolval) fprintf(output, "true\n");
1032 else fprintf(output, "false\n");
1033 break;
1034 case XPATH_NUMBER:
1035 switch (xmlXPathIsInf(cur->floatval)) {
1036 case 1:
1037 fprintf(output, "Object is a number : Infinity\n");
1038 break;
1039 case -1:
1040 fprintf(output, "Object is a number : -Infinity\n");
1041 break;
1042 default:
1043 if (xmlXPathIsNaN(cur->floatval)) {
1044 fprintf(output, "Object is a number : NaN\n");
1045 } else if (cur->floatval == 0 && xmlXPathGetSign(cur->floatval) != 0) {
1046 fprintf(output, "Object is a number : 0\n");
1047 } else {
1048 fprintf(output, "Object is a number : %0g\n", cur->floatval);
1049 }
1050 }
1051 break;
1052 case XPATH_STRING:
1053 fprintf(output, "Object is a string : ");
1054 xmlDebugDumpString(output, cur->stringval);
1055 fprintf(output, "\n");
1056 break;
1057 case XPATH_POINT:
1058 fprintf(output, "Object is a point : index %d in node", cur->index);
1059 xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user, depth + 1);
1060 fprintf(output, "\n");
1061 break;
1062 case XPATH_RANGE:
1063 if ((cur->user2 == NULL) ||
1064 ((cur->user2 == cur->user) && (cur->index == cur->index2))) {
1065 fprintf(output, "Object is a collapsed range :\n");
1066 fprintf(output, shift);
1067 if (cur->index >= 0)
1068 fprintf(output, "index %d in ", cur->index);
1069 fprintf(output, "node\n");
1070 xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user,
1071 depth + 1);
1072 } else {
1073 fprintf(output, "Object is a range :\n");
1074 fprintf(output, shift);
1075 fprintf(output, "From ");
1076 if (cur->index >= 0)
1077 fprintf(output, "index %d in ", cur->index);
1078 fprintf(output, "node\n");
1079 xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user,
1080 depth + 1);
1081 fprintf(output, shift);
1082 fprintf(output, "To ");
1083 if (cur->index2 >= 0)
1084 fprintf(output, "index %d in ", cur->index2);
1085 fprintf(output, "node\n");
1086 xmlXPathDebugDumpNode(output, (xmlNodePtr) cur->user2,
1087 depth + 1);
1088 fprintf(output, "\n");
1089 }
1090 break;
1091 case XPATH_LOCATIONSET:
1092#if defined(LIBXML_XPTR_ENABLED)
1093 fprintf(output, "Object is a Location Set:\n");
1094 xmlXPathDebugDumpLocationSet(output,
1095 (xmlLocationSetPtr) cur->user, depth);
1096#endif
1097 break;
1098 case XPATH_USERS:
1099 fprintf(output, "Object is user defined\n");
1100 break;
1101 }
1102}
1103
1104static void
1105xmlXPathDebugDumpStepOp(FILE *output, xmlXPathCompExprPtr comp,
1106 xmlXPathStepOpPtr op, int depth) {
1107 int i;
1108 char shift[100];
1109
1110 for (i = 0;((i < depth) && (i < 25));i++)
1111 shift[2 * i] = shift[2 * i + 1] = ' ';
1112 shift[2 * i] = shift[2 * i + 1] = 0;
1113
1114 fprintf(output, shift);
1115 if (op == NULL) {
1116 fprintf(output, "Step is NULL\n");
1117 return;
1118 }
1119 switch (op->op) {
1120 case XPATH_OP_END:
1121 fprintf(output, "END"); break;
1122 case XPATH_OP_AND:
1123 fprintf(output, "AND"); break;
1124 case XPATH_OP_OR:
1125 fprintf(output, "OR"); break;
1126 case XPATH_OP_EQUAL:
1127 if (op->value)
1128 fprintf(output, "EQUAL =");
1129 else
1130 fprintf(output, "EQUAL !=");
1131 break;
1132 case XPATH_OP_CMP:
1133 if (op->value)
1134 fprintf(output, "CMP <");
1135 else
1136 fprintf(output, "CMP >");
1137 if (!op->value2)
1138 fprintf(output, "=");
1139 break;
1140 case XPATH_OP_PLUS:
1141 if (op->value == 0)
1142 fprintf(output, "PLUS -");
1143 else if (op->value == 1)
1144 fprintf(output, "PLUS +");
1145 else if (op->value == 2)
1146 fprintf(output, "PLUS unary -");
1147 else if (op->value == 3)
1148 fprintf(output, "PLUS unary - -");
1149 break;
1150 case XPATH_OP_MULT:
1151 if (op->value == 0)
1152 fprintf(output, "MULT *");
1153 else if (op->value == 1)
1154 fprintf(output, "MULT div");
1155 else
1156 fprintf(output, "MULT mod");
1157 break;
1158 case XPATH_OP_UNION:
1159 fprintf(output, "UNION"); break;
1160 case XPATH_OP_ROOT:
1161 fprintf(output, "ROOT"); break;
1162 case XPATH_OP_NODE:
1163 fprintf(output, "NODE"); break;
1164 case XPATH_OP_RESET:
1165 fprintf(output, "RESET"); break;
1166 case XPATH_OP_SORT:
1167 fprintf(output, "SORT"); break;
1168 case XPATH_OP_COLLECT: {
1169 xmlXPathAxisVal axis = (xmlXPathAxisVal)op->value;
1170 xmlXPathTestVal test = (xmlXPathTestVal)op->value2;
1171 xmlXPathTypeVal type = (xmlXPathTypeVal)op->value3;
1172 const xmlChar *prefix = op->value4;
1173 const xmlChar *name = op->value5;
1174
1175 fprintf(output, "COLLECT ");
1176 switch (axis) {
1177 case AXIS_ANCESTOR:
1178 fprintf(output, " 'ancestors' "); break;
1179 case AXIS_ANCESTOR_OR_SELF:
1180 fprintf(output, " 'ancestors-or-self' "); break;
1181 case AXIS_ATTRIBUTE:
1182 fprintf(output, " 'attributes' "); break;
1183 case AXIS_CHILD:
1184 fprintf(output, " 'child' "); break;
1185 case AXIS_DESCENDANT:
1186 fprintf(output, " 'descendant' "); break;
1187 case AXIS_DESCENDANT_OR_SELF:
1188 fprintf(output, " 'descendant-or-self' "); break;
1189 case AXIS_FOLLOWING:
1190 fprintf(output, " 'following' "); break;
1191 case AXIS_FOLLOWING_SIBLING:
1192 fprintf(output, " 'following-siblings' "); break;
1193 case AXIS_NAMESPACE:
1194 fprintf(output, " 'namespace' "); break;
1195 case AXIS_PARENT:
1196 fprintf(output, " 'parent' "); break;
1197 case AXIS_PRECEDING:
1198 fprintf(output, " 'preceding' "); break;
1199 case AXIS_PRECEDING_SIBLING:
1200 fprintf(output, " 'preceding-sibling' "); break;
1201 case AXIS_SELF:
1202 fprintf(output, " 'self' "); break;
1203 }
1204 switch (test) {
1205 case NODE_TEST_NONE:
1206 fprintf(output, "'none' "); break;
1207 case NODE_TEST_TYPE:
1208 fprintf(output, "'type' "); break;
1209 case NODE_TEST_PI:
1210 fprintf(output, "'PI' "); break;
1211 case NODE_TEST_ALL:
1212 fprintf(output, "'all' "); break;
1213 case NODE_TEST_NS:
1214 fprintf(output, "'namespace' "); break;
1215 case NODE_TEST_NAME:
1216 fprintf(output, "'name' "); break;
1217 }
1218 switch (type) {
1219 case NODE_TYPE_NODE:
1220 fprintf(output, "'node' "); break;
1221 case NODE_TYPE_COMMENT:
1222 fprintf(output, "'comment' "); break;
1223 case NODE_TYPE_TEXT:
1224 fprintf(output, "'text' "); break;
1225 case NODE_TYPE_PI:
1226 fprintf(output, "'PI' "); break;
1227 }
1228 if (prefix != NULL)
1229 fprintf(output, "%s:", prefix);
1230 if (name != NULL)
1231 fprintf(output, "%s", (const char *) name);
1232 break;
1233
1234 }
1235 case XPATH_OP_VALUE: {
1236 xmlXPathObjectPtr object = (xmlXPathObjectPtr) op->value4;
1237
1238 fprintf(output, "ELEM ");
1239 xmlXPathDebugDumpObject(output, object, 0);
1240 goto finish;
1241 }
1242 case XPATH_OP_VARIABLE: {
1243 const xmlChar *prefix = op->value5;
1244 const xmlChar *name = op->value4;
1245
1246 if (prefix != NULL)
1247 fprintf(output, "VARIABLE %s:%s", prefix, name);
1248 else
1249 fprintf(output, "VARIABLE %s", name);
1250 break;
1251 }
1252 case XPATH_OP_FUNCTION: {
1253 int nbargs = op->value;
1254 const xmlChar *prefix = op->value5;
1255 const xmlChar *name = op->value4;
1256
1257 if (prefix != NULL)
1258 fprintf(output, "FUNCTION %s:%s(%d args)",
1259 prefix, name, nbargs);
1260 else
1261 fprintf(output, "FUNCTION %s(%d args)", name, nbargs);
1262 break;
1263 }
1264 case XPATH_OP_ARG: fprintf(output, "ARG"); break;
1265 case XPATH_OP_PREDICATE: fprintf(output, "PREDICATE"); break;
1266 case XPATH_OP_FILTER: fprintf(output, "FILTER"); break;
1267#ifdef LIBXML_XPTR_ENABLED
1268 case XPATH_OP_RANGETO: fprintf(output, "RANGETO"); break;
1269#endif
1270 default:
1271 fprintf(output, "UNKNOWN %d\n", op->op); return;
1272 }
1273 fprintf(output, "\n");
1274finish:
1275 if (op->ch1 >= 0)
1276 xmlXPathDebugDumpStepOp(output, comp, &comp->steps[op->ch1], depth + 1);
1277 if (op->ch2 >= 0)
1278 xmlXPathDebugDumpStepOp(output, comp, &comp->steps[op->ch2], depth + 1);
1279}
1280
1281/**
1282 * xmlXPathDebugDumpCompExpr:
1283 * @output: the FILE * for the output
1284 * @comp: the precompiled XPath expression
1285 * @depth: the indentation level.
1286 *
1287 * Dumps the tree of the compiled XPath expression.
1288 */
1289void
1290xmlXPathDebugDumpCompExpr(FILE *output, xmlXPathCompExprPtr comp,
1291 int depth) {
1292 int i;
1293 char shift[100];
1294
1295 if ((output == NULL) || (comp == NULL)) return;
1296
1297 for (i = 0;((i < depth) && (i < 25));i++)
1298 shift[2 * i] = shift[2 * i + 1] = ' ';
1299 shift[2 * i] = shift[2 * i + 1] = 0;
1300
1301 fprintf(output, shift);
1302
1303 fprintf(output, "Compiled Expression : %d elements\n",
1304 comp->nbStep);
1305 i = comp->last;
1306 xmlXPathDebugDumpStepOp(output, comp, &comp->steps[i], depth + 1);
1307}
1308
1309#ifdef XP_DEBUG_OBJ_USAGE
1310
1311/*
1312* XPath object usage related debugging variables.
1313*/
1314static int xmlXPathDebugObjCounterUndefined = 0;
1315static int xmlXPathDebugObjCounterNodeset = 0;
1316static int xmlXPathDebugObjCounterBool = 0;
1317static int xmlXPathDebugObjCounterNumber = 0;
1318static int xmlXPathDebugObjCounterString = 0;
1319static int xmlXPathDebugObjCounterPoint = 0;
1320static int xmlXPathDebugObjCounterRange = 0;
1321static int xmlXPathDebugObjCounterLocset = 0;
1322static int xmlXPathDebugObjCounterUsers = 0;
1323static int xmlXPathDebugObjCounterXSLTTree = 0;
1324static int xmlXPathDebugObjCounterAll = 0;
1325
1326static int xmlXPathDebugObjTotalUndefined = 0;
1327static int xmlXPathDebugObjTotalNodeset = 0;
1328static int xmlXPathDebugObjTotalBool = 0;
1329static int xmlXPathDebugObjTotalNumber = 0;
1330static int xmlXPathDebugObjTotalString = 0;
1331static int xmlXPathDebugObjTotalPoint = 0;
1332static int xmlXPathDebugObjTotalRange = 0;
1333static int xmlXPathDebugObjTotalLocset = 0;
1334static int xmlXPathDebugObjTotalUsers = 0;
1335static int xmlXPathDebugObjTotalXSLTTree = 0;
1336static int xmlXPathDebugObjTotalAll = 0;
1337
1338static int xmlXPathDebugObjMaxUndefined = 0;
1339static int xmlXPathDebugObjMaxNodeset = 0;
1340static int xmlXPathDebugObjMaxBool = 0;
1341static int xmlXPathDebugObjMaxNumber = 0;
1342static int xmlXPathDebugObjMaxString = 0;
1343static int xmlXPathDebugObjMaxPoint = 0;
1344static int xmlXPathDebugObjMaxRange = 0;
1345static int xmlXPathDebugObjMaxLocset = 0;
1346static int xmlXPathDebugObjMaxUsers = 0;
1347static int xmlXPathDebugObjMaxXSLTTree = 0;
1348static int xmlXPathDebugObjMaxAll = 0;
1349
1350/* REVISIT TODO: Make this static when committing */
1351static void
1352xmlXPathDebugObjUsageReset(xmlXPathContextPtr ctxt)
1353{
1354 if (ctxt != NULL) {
1355 if (ctxt->cache != NULL) {
1356 xmlXPathContextCachePtr cache =
1357 (xmlXPathContextCachePtr) ctxt->cache;
1358
1359 cache->dbgCachedAll = 0;
1360 cache->dbgCachedNodeset = 0;
1361 cache->dbgCachedString = 0;
1362 cache->dbgCachedBool = 0;
1363 cache->dbgCachedNumber = 0;
1364 cache->dbgCachedPoint = 0;
1365 cache->dbgCachedRange = 0;
1366 cache->dbgCachedLocset = 0;
1367 cache->dbgCachedUsers = 0;
1368 cache->dbgCachedXSLTTree = 0;
1369 cache->dbgCachedUndefined = 0;
1370
1371 cache->dbgReusedAll = 0;
1372 cache->dbgReusedNodeset = 0;
1373 cache->dbgReusedString = 0;
1374 cache->dbgReusedBool = 0;
1375 cache->dbgReusedNumber = 0;
1376 cache->dbgReusedPoint = 0;
1377 cache->dbgReusedRange = 0;
1378 cache->dbgReusedLocset = 0;
1379 cache->dbgReusedUsers = 0;
1380 cache->dbgReusedXSLTTree = 0;
1381 cache->dbgReusedUndefined = 0;
1382 }
1383 }
1384
1385 xmlXPathDebugObjCounterUndefined = 0;
1386 xmlXPathDebugObjCounterNodeset = 0;
1387 xmlXPathDebugObjCounterBool = 0;
1388 xmlXPathDebugObjCounterNumber = 0;
1389 xmlXPathDebugObjCounterString = 0;
1390 xmlXPathDebugObjCounterPoint = 0;
1391 xmlXPathDebugObjCounterRange = 0;
1392 xmlXPathDebugObjCounterLocset = 0;
1393 xmlXPathDebugObjCounterUsers = 0;
1394 xmlXPathDebugObjCounterXSLTTree = 0;
1395 xmlXPathDebugObjCounterAll = 0;
1396
1397 xmlXPathDebugObjTotalUndefined = 0;
1398 xmlXPathDebugObjTotalNodeset = 0;
1399 xmlXPathDebugObjTotalBool = 0;
1400 xmlXPathDebugObjTotalNumber = 0;
1401 xmlXPathDebugObjTotalString = 0;
1402 xmlXPathDebugObjTotalPoint = 0;
1403 xmlXPathDebugObjTotalRange = 0;
1404 xmlXPathDebugObjTotalLocset = 0;
1405 xmlXPathDebugObjTotalUsers = 0;
1406 xmlXPathDebugObjTotalXSLTTree = 0;
1407 xmlXPathDebugObjTotalAll = 0;
1408
1409 xmlXPathDebugObjMaxUndefined = 0;
1410 xmlXPathDebugObjMaxNodeset = 0;
1411 xmlXPathDebugObjMaxBool = 0;
1412 xmlXPathDebugObjMaxNumber = 0;
1413 xmlXPathDebugObjMaxString = 0;
1414 xmlXPathDebugObjMaxPoint = 0;
1415 xmlXPathDebugObjMaxRange = 0;
1416 xmlXPathDebugObjMaxLocset = 0;
1417 xmlXPathDebugObjMaxUsers = 0;
1418 xmlXPathDebugObjMaxXSLTTree = 0;
1419 xmlXPathDebugObjMaxAll = 0;
1420
1421}
1422
1423static void
1424xmlXPathDebugObjUsageRequested(xmlXPathContextPtr ctxt,
1425 xmlXPathObjectType objType)
1426{
1427 int isCached = 0;
1428
1429 if (ctxt != NULL) {
1430 if (ctxt->cache != NULL) {
1431 xmlXPathContextCachePtr cache =
1432 (xmlXPathContextCachePtr) ctxt->cache;
1433
1434 isCached = 1;
1435
1436 cache->dbgReusedAll++;
1437 switch (objType) {
1438 case XPATH_UNDEFINED:
1439 cache->dbgReusedUndefined++;
1440 break;
1441 case XPATH_NODESET:
1442 cache->dbgReusedNodeset++;
1443 break;
1444 case XPATH_BOOLEAN:
1445 cache->dbgReusedBool++;
1446 break;
1447 case XPATH_NUMBER:
1448 cache->dbgReusedNumber++;
1449 break;
1450 case XPATH_STRING:
1451 cache->dbgReusedString++;
1452 break;
1453 case XPATH_POINT:
1454 cache->dbgReusedPoint++;
1455 break;
1456 case XPATH_RANGE:
1457 cache->dbgReusedRange++;
1458 break;
1459 case XPATH_LOCATIONSET:
1460 cache->dbgReusedLocset++;
1461 break;
1462 case XPATH_USERS:
1463 cache->dbgReusedUsers++;
1464 break;
1465 case XPATH_XSLT_TREE:
1466 cache->dbgReusedXSLTTree++;
1467 break;
1468 default:
1469 break;
1470 }
1471 }
1472 }
1473
1474 switch (objType) {
1475 case XPATH_UNDEFINED:
1476 if (! isCached)
1477 xmlXPathDebugObjTotalUndefined++;
1478 xmlXPathDebugObjCounterUndefined++;
1479 if (xmlXPathDebugObjCounterUndefined >
1480 xmlXPathDebugObjMaxUndefined)
1481 xmlXPathDebugObjMaxUndefined =
1482 xmlXPathDebugObjCounterUndefined;
1483 break;
1484 case XPATH_NODESET:
1485 if (! isCached)
1486 xmlXPathDebugObjTotalNodeset++;
1487 xmlXPathDebugObjCounterNodeset++;
1488 if (xmlXPathDebugObjCounterNodeset >
1489 xmlXPathDebugObjMaxNodeset)
1490 xmlXPathDebugObjMaxNodeset =
1491 xmlXPathDebugObjCounterNodeset;
1492 break;
1493 case XPATH_BOOLEAN:
1494 if (! isCached)
1495 xmlXPathDebugObjTotalBool++;
1496 xmlXPathDebugObjCounterBool++;
1497 if (xmlXPathDebugObjCounterBool >
1498 xmlXPathDebugObjMaxBool)
1499 xmlXPathDebugObjMaxBool =
1500 xmlXPathDebugObjCounterBool;
1501 break;
1502 case XPATH_NUMBER:
1503 if (! isCached)
1504 xmlXPathDebugObjTotalNumber++;
1505 xmlXPathDebugObjCounterNumber++;
1506 if (xmlXPathDebugObjCounterNumber >
1507 xmlXPathDebugObjMaxNumber)
1508 xmlXPathDebugObjMaxNumber =
1509 xmlXPathDebugObjCounterNumber;
1510 break;
1511 case XPATH_STRING:
1512 if (! isCached)
1513 xmlXPathDebugObjTotalString++;
1514 xmlXPathDebugObjCounterString++;
1515 if (xmlXPathDebugObjCounterString >
1516 xmlXPathDebugObjMaxString)
1517 xmlXPathDebugObjMaxString =
1518 xmlXPathDebugObjCounterString;
1519 break;
1520 case XPATH_POINT:
1521 if (! isCached)
1522 xmlXPathDebugObjTotalPoint++;
1523 xmlXPathDebugObjCounterPoint++;
1524 if (xmlXPathDebugObjCounterPoint >
1525 xmlXPathDebugObjMaxPoint)
1526 xmlXPathDebugObjMaxPoint =
1527 xmlXPathDebugObjCounterPoint;
1528 break;
1529 case XPATH_RANGE:
1530 if (! isCached)
1531 xmlXPathDebugObjTotalRange++;
1532 xmlXPathDebugObjCounterRange++;
1533 if (xmlXPathDebugObjCounterRange >
1534 xmlXPathDebugObjMaxRange)
1535 xmlXPathDebugObjMaxRange =
1536 xmlXPathDebugObjCounterRange;
1537 break;
1538 case XPATH_LOCATIONSET:
1539 if (! isCached)
1540 xmlXPathDebugObjTotalLocset++;
1541 xmlXPathDebugObjCounterLocset++;
1542 if (xmlXPathDebugObjCounterLocset >
1543 xmlXPathDebugObjMaxLocset)
1544 xmlXPathDebugObjMaxLocset =
1545 xmlXPathDebugObjCounterLocset;
1546 break;
1547 case XPATH_USERS:
1548 if (! isCached)
1549 xmlXPathDebugObjTotalUsers++;
1550 xmlXPathDebugObjCounterUsers++;
1551 if (xmlXPathDebugObjCounterUsers >
1552 xmlXPathDebugObjMaxUsers)
1553 xmlXPathDebugObjMaxUsers =
1554 xmlXPathDebugObjCounterUsers;
1555 break;
1556 case XPATH_XSLT_TREE:
1557 if (! isCached)
1558 xmlXPathDebugObjTotalXSLTTree++;
1559 xmlXPathDebugObjCounterXSLTTree++;
1560 if (xmlXPathDebugObjCounterXSLTTree >
1561 xmlXPathDebugObjMaxXSLTTree)
1562 xmlXPathDebugObjMaxXSLTTree =
1563 xmlXPathDebugObjCounterXSLTTree;
1564 break;
1565 default:
1566 break;
1567 }
1568 if (! isCached)
1569 xmlXPathDebugObjTotalAll++;
1570 xmlXPathDebugObjCounterAll++;
1571 if (xmlXPathDebugObjCounterAll >
1572 xmlXPathDebugObjMaxAll)
1573 xmlXPathDebugObjMaxAll =
1574 xmlXPathDebugObjCounterAll;
1575}
1576
1577static void
1578xmlXPathDebugObjUsageReleased(xmlXPathContextPtr ctxt,
1579 xmlXPathObjectType objType)
1580{
1581 int isCached = 0;
1582
1583 if (ctxt != NULL) {
1584 if (ctxt->cache != NULL) {
1585 xmlXPathContextCachePtr cache =
1586 (xmlXPathContextCachePtr) ctxt->cache;
1587
1588 isCached = 1;
1589
1590 cache->dbgCachedAll++;
1591 switch (objType) {
1592 case XPATH_UNDEFINED:
1593 cache->dbgCachedUndefined++;
1594 break;
1595 case XPATH_NODESET:
1596 cache->dbgCachedNodeset++;
1597 break;
1598 case XPATH_BOOLEAN:
1599 cache->dbgCachedBool++;
1600 break;
1601 case XPATH_NUMBER:
1602 cache->dbgCachedNumber++;
1603 break;
1604 case XPATH_STRING:
1605 cache->dbgCachedString++;
1606 break;
1607 case XPATH_POINT:
1608 cache->dbgCachedPoint++;
1609 break;
1610 case XPATH_RANGE:
1611 cache->dbgCachedRange++;
1612 break;
1613 case XPATH_LOCATIONSET:
1614 cache->dbgCachedLocset++;
1615 break;
1616 case XPATH_USERS:
1617 cache->dbgCachedUsers++;
1618 break;
1619 case XPATH_XSLT_TREE:
1620 cache->dbgCachedXSLTTree++;
1621 break;
1622 default:
1623 break;
1624 }
1625
1626 }
1627 }
1628 switch (objType) {
1629 case XPATH_UNDEFINED:
1630 xmlXPathDebugObjCounterUndefined--;
1631 break;
1632 case XPATH_NODESET:
1633 xmlXPathDebugObjCounterNodeset--;
1634 break;
1635 case XPATH_BOOLEAN:
1636 xmlXPathDebugObjCounterBool--;
1637 break;
1638 case XPATH_NUMBER:
1639 xmlXPathDebugObjCounterNumber--;
1640 break;
1641 case XPATH_STRING:
1642 xmlXPathDebugObjCounterString--;
1643 break;
1644 case XPATH_POINT:
1645 xmlXPathDebugObjCounterPoint--;
1646 break;
1647 case XPATH_RANGE:
1648 xmlXPathDebugObjCounterRange--;
1649 break;
1650 case XPATH_LOCATIONSET:
1651 xmlXPathDebugObjCounterLocset--;
1652 break;
1653 case XPATH_USERS:
1654 xmlXPathDebugObjCounterUsers--;
1655 break;
1656 case XPATH_XSLT_TREE:
1657 xmlXPathDebugObjCounterXSLTTree--;
1658 break;
1659 default:
1660 break;
1661 }
1662 xmlXPathDebugObjCounterAll--;
1663}
1664
1665/* REVISIT TODO: Make this static when committing */
1666static void
1667xmlXPathDebugObjUsageDisplay(xmlXPathContextPtr ctxt)
1668{
1669 int reqAll, reqNodeset, reqString, reqBool, reqNumber,
1670 reqXSLTTree, reqUndefined;
1671 int caAll = 0, caNodeset = 0, caString = 0, caBool = 0,
1672 caNumber = 0, caXSLTTree = 0, caUndefined = 0;
1673 int reAll = 0, reNodeset = 0, reString = 0, reBool = 0,
1674 reNumber = 0, reXSLTTree = 0, reUndefined = 0;
1675 int leftObjs = xmlXPathDebugObjCounterAll;
1676
1677 reqAll = xmlXPathDebugObjTotalAll;
1678 reqNodeset = xmlXPathDebugObjTotalNodeset;
1679 reqString = xmlXPathDebugObjTotalString;
1680 reqBool = xmlXPathDebugObjTotalBool;
1681 reqNumber = xmlXPathDebugObjTotalNumber;
1682 reqXSLTTree = xmlXPathDebugObjTotalXSLTTree;
1683 reqUndefined = xmlXPathDebugObjTotalUndefined;
1684
1685 printf("# XPath object usage:\n");
1686
1687 if (ctxt != NULL) {
1688 if (ctxt->cache != NULL) {
1689 xmlXPathContextCachePtr cache =
1690 (xmlXPathContextCachePtr) ctxt->cache;
1691
1692 reAll = cache->dbgReusedAll;
1693 reqAll += reAll;
1694 reNodeset = cache->dbgReusedNodeset;
1695 reqNodeset += reNodeset;
1696 reString = cache->dbgReusedString;
1697 reqString += reString;
1698 reBool = cache->dbgReusedBool;
1699 reqBool += reBool;
1700 reNumber = cache->dbgReusedNumber;
1701 reqNumber += reNumber;
1702 reXSLTTree = cache->dbgReusedXSLTTree;
1703 reqXSLTTree += reXSLTTree;
1704 reUndefined = cache->dbgReusedUndefined;
1705 reqUndefined += reUndefined;
1706
1707 caAll = cache->dbgCachedAll;
1708 caBool = cache->dbgCachedBool;
1709 caNodeset = cache->dbgCachedNodeset;
1710 caString = cache->dbgCachedString;
1711 caNumber = cache->dbgCachedNumber;
1712 caXSLTTree = cache->dbgCachedXSLTTree;
1713 caUndefined = cache->dbgCachedUndefined;
1714
1715 if (cache->nodesetObjs)
1716 leftObjs -= cache->nodesetObjs->number;
1717 if (cache->stringObjs)
1718 leftObjs -= cache->stringObjs->number;
1719 if (cache->booleanObjs)
1720 leftObjs -= cache->booleanObjs->number;
1721 if (cache->numberObjs)
1722 leftObjs -= cache->numberObjs->number;
1723 if (cache->miscObjs)
1724 leftObjs -= cache->miscObjs->number;
1725 }
1726 }
1727
1728 printf("# all\n");
1729 printf("# total : %d\n", reqAll);
1730 printf("# left : %d\n", leftObjs);
1731 printf("# created: %d\n", xmlXPathDebugObjTotalAll);
1732 printf("# reused : %d\n", reAll);
1733 printf("# max : %d\n", xmlXPathDebugObjMaxAll);
1734
1735 printf("# node-sets\n");
1736 printf("# total : %d\n", reqNodeset);
1737 printf("# created: %d\n", xmlXPathDebugObjTotalNodeset);
1738 printf("# reused : %d\n", reNodeset);
1739 printf("# max : %d\n", xmlXPathDebugObjMaxNodeset);
1740
1741 printf("# strings\n");
1742 printf("# total : %d\n", reqString);
1743 printf("# created: %d\n", xmlXPathDebugObjTotalString);
1744 printf("# reused : %d\n", reString);
1745 printf("# max : %d\n", xmlXPathDebugObjMaxString);
1746
1747 printf("# booleans\n");
1748 printf("# total : %d\n", reqBool);
1749 printf("# created: %d\n", xmlXPathDebugObjTotalBool);
1750 printf("# reused : %d\n", reBool);
1751 printf("# max : %d\n", xmlXPathDebugObjMaxBool);
1752
1753 printf("# numbers\n");
1754 printf("# total : %d\n", reqNumber);
1755 printf("# created: %d\n", xmlXPathDebugObjTotalNumber);
1756 printf("# reused : %d\n", reNumber);
1757 printf("# max : %d\n", xmlXPathDebugObjMaxNumber);
1758
1759 printf("# XSLT result tree fragments\n");
1760 printf("# total : %d\n", reqXSLTTree);
1761 printf("# created: %d\n", xmlXPathDebugObjTotalXSLTTree);
1762 printf("# reused : %d\n", reXSLTTree);
1763 printf("# max : %d\n", xmlXPathDebugObjMaxXSLTTree);
1764
1765 printf("# undefined\n");
1766 printf("# total : %d\n", reqUndefined);
1767 printf("# created: %d\n", xmlXPathDebugObjTotalUndefined);
1768 printf("# reused : %d\n", reUndefined);
1769 printf("# max : %d\n", xmlXPathDebugObjMaxUndefined);
1770
1771}
1772
1773#endif /* XP_DEBUG_OBJ_USAGE */
1774
1775#endif /* LIBXML_DEBUG_ENABLED */
1776
1777/************************************************************************
1778 * *
1779 * XPath object caching *
1780 * *
1781 ************************************************************************/
1782
1783/**
1784 * xmlXPathNewCache:
1785 *
1786 * Create a new object cache
1787 *
1788 * Returns the xmlXPathCache just allocated.
1789 */
1790static xmlXPathContextCachePtr
1791xmlXPathNewCache(void)
1792{
1793 xmlXPathContextCachePtr ret;
1794
1795 ret = (xmlXPathContextCachePtr) xmlMalloc(sizeof(xmlXPathContextCache));
1796 if (ret == NULL) {
1797 xmlXPathErrMemory(NULL, "creating object cache\n");
1798 return(NULL);
1799 }
1800 memset(ret, 0 , (size_t) sizeof(xmlXPathContextCache));
1801 ret->maxNodeset = 100;
1802 ret->maxString = 100;
1803 ret->maxBoolean = 100;
1804 ret->maxNumber = 100;
1805 ret->maxMisc = 100;
1806 return(ret);
1807}
1808
1809static void
1810xmlXPathCacheFreeObjectList(xmlPointerListPtr list)
1811{
1812 int i;
1813 xmlXPathObjectPtr obj;
1814
1815 if (list == NULL)
1816 return;
1817
1818 for (i = 0; i < list->number; i++) {
1819 obj = list->items[i];
1820 /*
1821 * Note that it is already assured that we don't need to
1822 * look out for namespace nodes in the node-set.
1823 */
1824 if (obj->nodesetval != NULL) {
1825 if (obj->nodesetval->nodeTab != NULL)
1826 xmlFree(obj->nodesetval->nodeTab);
1827 xmlFree(obj->nodesetval);
1828 }
1829 xmlFree(obj);
1830#ifdef XP_DEBUG_OBJ_USAGE
1831 xmlXPathDebugObjCounterAll--;
1832#endif
1833 }
1834 xmlPointerListFree(list);
1835}
1836
1837static void
1838xmlXPathFreeCache(xmlXPathContextCachePtr cache)
1839{
1840 if (cache == NULL)
1841 return;
1842 if (cache->nodesetObjs)
1843 xmlXPathCacheFreeObjectList(cache->nodesetObjs);
1844 if (cache->stringObjs)
1845 xmlXPathCacheFreeObjectList(cache->stringObjs);
1846 if (cache->booleanObjs)
1847 xmlXPathCacheFreeObjectList(cache->booleanObjs);
1848 if (cache->numberObjs)
1849 xmlXPathCacheFreeObjectList(cache->numberObjs);
1850 if (cache->miscObjs)
1851 xmlXPathCacheFreeObjectList(cache->miscObjs);
1852 xmlFree(cache);
1853}
1854
1855/**
1856 * xmlXPathContextSetCache:
1857 *
1858 * @ctxt: the XPath context
1859 * @active: enables/disables (creates/frees) the cache
1860 * @value: a value with semantics dependant on @options
1861 * @options: options (currently only the value 0 is used)
1862 *
1863 * Creates/frees an object cache on the XPath context.
1864 * If activates XPath objects (xmlXPathObject) will be cached internally
1865 * to be reused.
1866 * @options:
1867 * 0: This will set the XPath object caching:
1868 * @value:
1869 * This will set the maximum number of XPath objects
1870 * to be cached per slot
1871 * There are 5 slots for: node-set, string, number, boolean, and
1872 * misc objects. Use <0 for the default number (100).
1873 * Other values for @options have currently no effect.
1874 *
1875 * Returns 0 if the setting succeeded, and -1 on API or internal errors.
1876 */
1877int
1878xmlXPathContextSetCache(xmlXPathContextPtr ctxt,
1879 int active,
1880 int value,
1881 int options)
1882{
1883 if (ctxt == NULL)
1884 return(-1);
1885 if (active) {
1886 xmlXPathContextCachePtr cache;
1887
1888 if (ctxt->cache == NULL) {
1889 ctxt->cache = xmlXPathNewCache();
1890 if (ctxt->cache == NULL)
1891 return(-1);
1892 }
1893 cache = (xmlXPathContextCachePtr) ctxt->cache;
1894 if (options == 0) {
1895 if (value < 0)
1896 value = 100;
1897 cache->maxNodeset = value;
1898 cache->maxString = value;
1899 cache->maxNumber = value;
1900 cache->maxBoolean = value;
1901 cache->maxMisc = value;
1902 }
1903 } else if (ctxt->cache != NULL) {
1904 xmlXPathFreeCache((xmlXPathContextCachePtr) ctxt->cache);
1905 ctxt->cache = NULL;
1906 }
1907 return(0);
1908}
1909
1910/**
1911 * xmlXPathCacheWrapNodeSet:
1912 * @ctxt: the XPath context
1913 * @val: the NodePtr value
1914 *
1915 * This is the cached version of xmlXPathWrapNodeSet().
1916 * Wrap the Nodeset @val in a new xmlXPathObjectPtr
1917 *
1918 * Returns the created or reused object.
1919 */
1920static xmlXPathObjectPtr
1921xmlXPathCacheWrapNodeSet(xmlXPathContextPtr ctxt, xmlNodeSetPtr val)
1922{
1923 if ((ctxt != NULL) && (ctxt->cache != NULL)) {
1924 xmlXPathContextCachePtr cache =
1925 (xmlXPathContextCachePtr) ctxt->cache;
1926
1927 if ((cache->miscObjs != NULL) &&
1928 (cache->miscObjs->number != 0))
1929 {
1930 xmlXPathObjectPtr ret;
1931
1932 ret = (xmlXPathObjectPtr)
1933 cache->miscObjs->items[--cache->miscObjs->number];
1934 ret->type = XPATH_NODESET;
1935 ret->nodesetval = val;
1936#ifdef XP_DEBUG_OBJ_USAGE
1937 xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET);
1938#endif
1939 return(ret);
1940 }
1941 }
1942
1943 return(xmlXPathWrapNodeSet(val));
1944
1945}
1946
1947/**
1948 * xmlXPathCacheWrapString:
1949 * @ctxt: the XPath context
1950 * @val: the xmlChar * value
1951 *
1952 * This is the cached version of xmlXPathWrapString().
1953 * Wraps the @val string into an XPath object.
1954 *
1955 * Returns the created or reused object.
1956 */
1957static xmlXPathObjectPtr
1958xmlXPathCacheWrapString(xmlXPathContextPtr ctxt, xmlChar *val)
1959{
1960 if ((ctxt != NULL) && (ctxt->cache != NULL)) {
1961 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
1962
1963 if ((cache->stringObjs != NULL) &&
1964 (cache->stringObjs->number != 0))
1965 {
1966
1967 xmlXPathObjectPtr ret;
1968
1969 ret = (xmlXPathObjectPtr)
1970 cache->stringObjs->items[--cache->stringObjs->number];
1971 ret->type = XPATH_STRING;
1972 ret->stringval = val;
1973#ifdef XP_DEBUG_OBJ_USAGE
1974 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
1975#endif
1976 return(ret);
1977 } else if ((cache->miscObjs != NULL) &&
1978 (cache->miscObjs->number != 0))
1979 {
1980 xmlXPathObjectPtr ret;
1981 /*
1982 * Fallback to misc-cache.
1983 */
1984 ret = (xmlXPathObjectPtr)
1985 cache->miscObjs->items[--cache->miscObjs->number];
1986
1987 ret->type = XPATH_STRING;
1988 ret->stringval = val;
1989#ifdef XP_DEBUG_OBJ_USAGE
1990 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
1991#endif
1992 return(ret);
1993 }
1994 }
1995 return(xmlXPathWrapString(val));
1996}
1997
1998/**
1999 * xmlXPathCacheNewNodeSet:
2000 * @ctxt: the XPath context
2001 * @val: the NodePtr value
2002 *
2003 * This is the cached version of xmlXPathNewNodeSet().
2004 * Acquire an xmlXPathObjectPtr of type NodeSet and initialize
2005 * it with the single Node @val
2006 *
2007 * Returns the created or reused object.
2008 */
2009static xmlXPathObjectPtr
2010xmlXPathCacheNewNodeSet(xmlXPathContextPtr ctxt, xmlNodePtr val)
2011{
2012 if ((ctxt != NULL) && (ctxt->cache)) {
2013 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
2014
2015 if ((cache->nodesetObjs != NULL) &&
2016 (cache->nodesetObjs->number != 0))
2017 {
2018 xmlXPathObjectPtr ret;
2019 /*
2020 * Use the nodset-cache.
2021 */
2022 ret = (xmlXPathObjectPtr)
2023 cache->nodesetObjs->items[--cache->nodesetObjs->number];
2024 ret->type = XPATH_NODESET;
2025 ret->boolval = 0;
2026 if (val) {
2027 if ((ret->nodesetval->nodeMax == 0) ||
2028 (val->type == XML_NAMESPACE_DECL))
2029 {
2030 xmlXPathNodeSetAddUnique(ret->nodesetval, val);
2031 } else {
2032 ret->nodesetval->nodeTab[0] = val;
2033 ret->nodesetval->nodeNr = 1;
2034 }
2035 }
2036#ifdef XP_DEBUG_OBJ_USAGE
2037 xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET);
2038#endif
2039 return(ret);
2040 } else if ((cache->miscObjs != NULL) &&
2041 (cache->miscObjs->number != 0))
2042 {
2043 xmlXPathObjectPtr ret;
2044 /*
2045 * Fallback to misc-cache.
2046 */
2047
2048 ret = (xmlXPathObjectPtr)
2049 cache->miscObjs->items[--cache->miscObjs->number];
2050
2051 ret->type = XPATH_NODESET;
2052 ret->boolval = 0;
2053 ret->nodesetval = xmlXPathNodeSetCreate(val);
2054#ifdef XP_DEBUG_OBJ_USAGE
2055 xmlXPathDebugObjUsageRequested(ctxt, XPATH_NODESET);
2056#endif
2057 return(ret);
2058 }
2059 }
2060 return(xmlXPathNewNodeSet(val));
2061}
2062
2063/**
2064 * xmlXPathCacheNewCString:
2065 * @ctxt: the XPath context
2066 * @val: the char * value
2067 *
2068 * This is the cached version of xmlXPathNewCString().
2069 * Acquire an xmlXPathObjectPtr of type string and of value @val
2070 *
2071 * Returns the created or reused object.
2072 */
2073static xmlXPathObjectPtr
2074xmlXPathCacheNewCString(xmlXPathContextPtr ctxt, const char *val)
2075{
2076 if ((ctxt != NULL) && (ctxt->cache)) {
2077 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
2078
2079 if ((cache->stringObjs != NULL) &&
2080 (cache->stringObjs->number != 0))
2081 {
2082 xmlXPathObjectPtr ret;
2083
2084 ret = (xmlXPathObjectPtr)
2085 cache->stringObjs->items[--cache->stringObjs->number];
2086
2087 ret->type = XPATH_STRING;
2088 ret->stringval = xmlStrdup(BAD_CAST val);
2089#ifdef XP_DEBUG_OBJ_USAGE
2090 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
2091#endif
2092 return(ret);
2093 } else if ((cache->miscObjs != NULL) &&
2094 (cache->miscObjs->number != 0))
2095 {
2096 xmlXPathObjectPtr ret;
2097
2098 ret = (xmlXPathObjectPtr)
2099 cache->miscObjs->items[--cache->miscObjs->number];
2100
2101 ret->type = XPATH_STRING;
2102 ret->stringval = xmlStrdup(BAD_CAST val);
2103#ifdef XP_DEBUG_OBJ_USAGE
2104 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
2105#endif
2106 return(ret);
2107 }
2108 }
2109 return(xmlXPathNewCString(val));
2110}
2111
2112/**
2113 * xmlXPathCacheNewString:
2114 * @ctxt: the XPath context
2115 * @val: the xmlChar * value
2116 *
2117 * This is the cached version of xmlXPathNewString().
2118 * Acquire an xmlXPathObjectPtr of type string and of value @val
2119 *
2120 * Returns the created or reused object.
2121 */
2122static xmlXPathObjectPtr
2123xmlXPathCacheNewString(xmlXPathContextPtr ctxt, const xmlChar *val)
2124{
2125 if ((ctxt != NULL) && (ctxt->cache)) {
2126 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
2127
2128 if ((cache->stringObjs != NULL) &&
2129 (cache->stringObjs->number != 0))
2130 {
2131 xmlXPathObjectPtr ret;
2132
2133 ret = (xmlXPathObjectPtr)
2134 cache->stringObjs->items[--cache->stringObjs->number];
2135 ret->type = XPATH_STRING;
2136 if (val != NULL)
2137 ret->stringval = xmlStrdup(val);
2138 else
2139 ret->stringval = xmlStrdup((const xmlChar *)"");
2140#ifdef XP_DEBUG_OBJ_USAGE
2141 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
2142#endif
2143 return(ret);
2144 } else if ((cache->miscObjs != NULL) &&
2145 (cache->miscObjs->number != 0))
2146 {
2147 xmlXPathObjectPtr ret;
2148
2149 ret = (xmlXPathObjectPtr)
2150 cache->miscObjs->items[--cache->miscObjs->number];
2151
2152 ret->type = XPATH_STRING;
2153 if (val != NULL)
2154 ret->stringval = xmlStrdup(val);
2155 else
2156 ret->stringval = xmlStrdup((const xmlChar *)"");
2157#ifdef XP_DEBUG_OBJ_USAGE
2158 xmlXPathDebugObjUsageRequested(ctxt, XPATH_STRING);
2159#endif
2160 return(ret);
2161 }
2162 }
2163 return(xmlXPathNewString(val));
2164}
2165
2166/**
2167 * xmlXPathCacheNewBoolean:
2168 * @ctxt: the XPath context
2169 * @val: the boolean value
2170 *
2171 * This is the cached version of xmlXPathNewBoolean().
2172 * Acquires an xmlXPathObjectPtr of type boolean and of value @val
2173 *
2174 * Returns the created or reused object.
2175 */
2176static xmlXPathObjectPtr
2177xmlXPathCacheNewBoolean(xmlXPathContextPtr ctxt, int val)
2178{
2179 if ((ctxt != NULL) && (ctxt->cache)) {
2180 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
2181
2182 if ((cache->booleanObjs != NULL) &&
2183 (cache->booleanObjs->number != 0))
2184 {
2185 xmlXPathObjectPtr ret;
2186
2187 ret = (xmlXPathObjectPtr)
2188 cache->booleanObjs->items[--cache->booleanObjs->number];
2189 ret->type = XPATH_BOOLEAN;
2190 ret->boolval = (val != 0);
2191#ifdef XP_DEBUG_OBJ_USAGE
2192 xmlXPathDebugObjUsageRequested(ctxt, XPATH_BOOLEAN);
2193#endif
2194 return(ret);
2195 } else if ((cache->miscObjs != NULL) &&
2196 (cache->miscObjs->number != 0))
2197 {
2198 xmlXPathObjectPtr ret;
2199
2200 ret = (xmlXPathObjectPtr)
2201 cache->miscObjs->items[--cache->miscObjs->number];
2202
2203 ret->type = XPATH_BOOLEAN;
2204 ret->boolval = (val != 0);
2205#ifdef XP_DEBUG_OBJ_USAGE
2206 xmlXPathDebugObjUsageRequested(ctxt, XPATH_BOOLEAN);
2207#endif
2208 return(ret);
2209 }
2210 }
2211 return(xmlXPathNewBoolean(val));
2212}
2213
2214/**
2215 * xmlXPathCacheNewFloat:
2216 * @ctxt: the XPath context
2217 * @val: the double value
2218 *
2219 * This is the cached version of xmlXPathNewFloat().
2220 * Acquires an xmlXPathObjectPtr of type double and of value @val
2221 *
2222 * Returns the created or reused object.
2223 */
2224static xmlXPathObjectPtr
2225xmlXPathCacheNewFloat(xmlXPathContextPtr ctxt, double val)
2226{
2227 if ((ctxt != NULL) && (ctxt->cache)) {
2228 xmlXPathContextCachePtr cache = (xmlXPathContextCachePtr) ctxt->cache;
2229
2230 if ((cache->numberObjs != NULL) &&
2231 (cache->numberObjs->number != 0))
2232 {
2233 xmlXPathObjectPtr ret;
2234
2235 ret = (xmlXPathObjectPtr)
2236 cache->numberObjs->items[--cache->numberObjs->number];
2237 ret->type = XPATH_NUMBER;
2238 ret->floatval = val;
2239#ifdef XP_DEBUG_OBJ_USAGE
2240 xmlXPathDebugObjUsageRequested(ctxt, XPATH_NUMBER);
2241#endif
2242 return(ret);
2243 } else if ((cache->miscObjs != NULL) &&
2244 (cache->miscObjs->number != 0))
2245 {
2246 xmlXPathObjectPtr ret;
2247
2248 ret = (xmlXPathObjectPtr)
2249 cache->miscObjs->items[--cache->miscObjs->number];
2250
2251 ret->type = XPATH_NUMBER;
2252 ret->floatval = val;
2253#ifdef XP_DEBUG_OBJ_USAGE
2254 xmlXPathDebugObjUsageRequested(ctxt, XPATH_NUMBER);
2255#endif
2256 return(ret);
2257 }
2258 }
2259 return(xmlXPathNewFloat(val));
2260}
2261
2262/**
2263 * xmlXPathCacheConvertString:
2264 * @ctxt: the XPath context
2265 * @val: an XPath object
2266 *
2267 * This is the cached version of xmlXPathConvertString().
2268 * Converts an existing object to its string() equivalent
2269 *
2270 * Returns a created or reused object, the old one is freed (cached)
2271 * (or the operation is done directly on @val)
2272 */
2273
2274static xmlXPathObjectPtr
2275xmlXPathCacheConvertString(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) {
2276 xmlChar *res = NULL;
2277
2278 if (val == NULL)
2279 return(xmlXPathCacheNewCString(ctxt, ""));
2280
2281 switch (val->type) {
2282 case XPATH_UNDEFINED:
2283#ifdef DEBUG_EXPR
2284 xmlGenericError(xmlGenericErrorContext, "STRING: undefined\n");
2285#endif
2286 break;
2287 case XPATH_NODESET:
2288 case XPATH_XSLT_TREE:
2289 res = xmlXPathCastNodeSetToString(val->nodesetval);
2290 break;
2291 case XPATH_STRING:
2292 return(val);
2293 case XPATH_BOOLEAN:
2294 res = xmlXPathCastBooleanToString(val->boolval);
2295 break;
2296 case XPATH_NUMBER:
2297 res = xmlXPathCastNumberToString(val->floatval);
2298 break;
2299 case XPATH_USERS:
2300 case XPATH_POINT:
2301 case XPATH_RANGE:
2302 case XPATH_LOCATIONSET:
2303 TODO;
2304 break;
2305 }
2306 xmlXPathReleaseObject(ctxt, val);
2307 if (res == NULL)
2308 return(xmlXPathCacheNewCString(ctxt, ""));
2309 return(xmlXPathCacheWrapString(ctxt, res));
2310}
2311
2312/**
2313 * xmlXPathCacheObjectCopy:
2314 * @ctxt: the XPath context
2315 * @val: the original object
2316 *
2317 * This is the cached version of xmlXPathObjectCopy().
2318 * Acquire a copy of a given object
2319 *
2320 * Returns a created or reused created object.
2321 */
2322static xmlXPathObjectPtr
2323xmlXPathCacheObjectCopy(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val)
2324{
2325 if (val == NULL)
2326 return(NULL);
2327
2328 if (XP_HAS_CACHE(ctxt)) {
2329 switch (val->type) {
2330 case XPATH_NODESET:
2331 return(xmlXPathCacheWrapNodeSet(ctxt,
2332 xmlXPathNodeSetMerge(NULL, val->nodesetval)));
2333 case XPATH_STRING:
2334 return(xmlXPathCacheNewString(ctxt, val->stringval));
2335 case XPATH_BOOLEAN:
2336 return(xmlXPathCacheNewBoolean(ctxt, val->boolval));
2337 case XPATH_NUMBER:
2338 return(xmlXPathCacheNewFloat(ctxt, val->floatval));
2339 default:
2340 break;
2341 }
2342 }
2343 return(xmlXPathObjectCopy(val));
2344}
2345
2346/**
2347 * xmlXPathCacheConvertBoolean:
2348 * @ctxt: the XPath context
2349 * @val: an XPath object
2350 *
2351 * This is the cached version of xmlXPathConvertBoolean().
2352 * Converts an existing object to its boolean() equivalent
2353 *
2354 * Returns a created or reused object, the old one is freed (or the operation
2355 * is done directly on @val)
2356 */
2357static xmlXPathObjectPtr
2358xmlXPathCacheConvertBoolean(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) {
2359 xmlXPathObjectPtr ret;
2360
2361 if (val == NULL)
2362 return(xmlXPathCacheNewBoolean(ctxt, 0));
2363 if (val->type == XPATH_BOOLEAN)
2364 return(val);
2365 ret = xmlXPathCacheNewBoolean(ctxt, xmlXPathCastToBoolean(val));
2366 xmlXPathReleaseObject(ctxt, val);
2367 return(ret);
2368}
2369
2370/**
2371 * xmlXPathCacheConvertNumber:
2372 * @ctxt: the XPath context
2373 * @val: an XPath object
2374 *
2375 * This is the cached version of xmlXPathConvertNumber().
2376 * Converts an existing object to its number() equivalent
2377 *
2378 * Returns a created or reused object, the old one is freed (or the operation
2379 * is done directly on @val)
2380 */
2381static xmlXPathObjectPtr
2382xmlXPathCacheConvertNumber(xmlXPathContextPtr ctxt, xmlXPathObjectPtr val) {
2383 xmlXPathObjectPtr ret;
2384
2385 if (val == NULL)
2386 return(xmlXPathCacheNewFloat(ctxt, 0.0));
2387 if (val->type == XPATH_NUMBER)
2388 return(val);
2389 ret = xmlXPathCacheNewFloat(ctxt, xmlXPathCastToNumber(val));
2390 xmlXPathReleaseObject(ctxt, val);
2391 return(ret);
2392}
2393
2394/************************************************************************
2395 * *
2396 * Parser stacks related functions and macros *
2397 * *
2398 ************************************************************************/
2399
2400/**
2401 * valuePop:
2402 * @ctxt: an XPath evaluation context
2403 *
2404 * Pops the top XPath object from the value stack
2405 *
2406 * Returns the XPath object just removed
2407 */
2408xmlXPathObjectPtr
2409valuePop(xmlXPathParserContextPtr ctxt)
2410{
2411 xmlXPathObjectPtr ret;
2412
2413 if ((ctxt == NULL) || (ctxt->valueNr <= 0))
2414 return (NULL);
2415 ctxt->valueNr--;
2416 if (ctxt->valueNr > 0)
2417 ctxt->value = ctxt->valueTab[ctxt->valueNr - 1];
2418 else
2419 ctxt->value = NULL;
2420 ret = ctxt->valueTab[ctxt->valueNr];
2421 ctxt->valueTab[ctxt->valueNr] = NULL;
2422 return (ret);
2423}
2424/**
2425 * valuePush:
2426 * @ctxt: an XPath evaluation context
2427 * @value: the XPath object
2428 *
2429 * Pushes a new XPath object on top of the value stack
2430 *
2431 * returns the number of items on the value stack
2432 */
2433int
2434valuePush(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr value)
2435{
2436 if ((ctxt == NULL) || (value == NULL)) return(-1);
2437 if (ctxt->valueNr >= ctxt->valueMax) {
2438 xmlXPathObjectPtr *tmp;
2439
2440 tmp = (xmlXPathObjectPtr *) xmlRealloc(ctxt->valueTab,
2441 2 * ctxt->valueMax *
2442 sizeof(ctxt->valueTab[0]));
2443 if (tmp == NULL) {
2444 xmlGenericError(xmlGenericErrorContext, "realloc failed !\n");
2445 return (0);
2446 }
2447 ctxt->valueMax *= 2;
2448 ctxt->valueTab = tmp;
2449 }
2450 ctxt->valueTab[ctxt->valueNr] = value;
2451 ctxt->value = value;
2452 return (ctxt->valueNr++);
2453}
2454
2455/**
2456 * xmlXPathPopBoolean:
2457 * @ctxt: an XPath parser context
2458 *
2459 * Pops a boolean from the stack, handling conversion if needed.
2460 * Check error with #xmlXPathCheckError.
2461 *
2462 * Returns the boolean
2463 */
2464int
2465xmlXPathPopBoolean (xmlXPathParserContextPtr ctxt) {
2466 xmlXPathObjectPtr obj;
2467 int ret;
2468
2469 obj = valuePop(ctxt);
2470 if (obj == NULL) {
2471 xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND);
2472 return(0);
2473 }
2474 if (obj->type != XPATH_BOOLEAN)
2475 ret = xmlXPathCastToBoolean(obj);
2476 else
2477 ret = obj->boolval;
2478 xmlXPathReleaseObject(ctxt->context, obj);
2479 return(ret);
2480}
2481
2482/**
2483 * xmlXPathPopNumber:
2484 * @ctxt: an XPath parser context
2485 *
2486 * Pops a number from the stack, handling conversion if needed.
2487 * Check error with #xmlXPathCheckError.
2488 *
2489 * Returns the number
2490 */
2491double
2492xmlXPathPopNumber (xmlXPathParserContextPtr ctxt) {
2493 xmlXPathObjectPtr obj;
2494 double ret;
2495
2496 obj = valuePop(ctxt);
2497 if (obj == NULL) {
2498 xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND);
2499 return(0);
2500 }
2501 if (obj->type != XPATH_NUMBER)
2502 ret = xmlXPathCastToNumber(obj);
2503 else
2504 ret = obj->floatval;
2505 xmlXPathReleaseObject(ctxt->context, obj);
2506 return(ret);
2507}
2508
2509/**
2510 * xmlXPathPopString:
2511 * @ctxt: an XPath parser context
2512 *
2513 * Pops a string from the stack, handling conversion if needed.
2514 * Check error with #xmlXPathCheckError.
2515 *
2516 * Returns the string
2517 */
2518xmlChar *
2519xmlXPathPopString (xmlXPathParserContextPtr ctxt) {
2520 xmlXPathObjectPtr obj;
2521 xmlChar * ret;
2522
2523 obj = valuePop(ctxt);
2524 if (obj == NULL) {
2525 xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND);
2526 return(NULL);
2527 }
2528 ret = xmlXPathCastToString(obj); /* this does required strdup */
2529 /* TODO: needs refactoring somewhere else */
2530 if (obj->stringval == ret)
2531 obj->stringval = NULL;
2532 xmlXPathReleaseObject(ctxt->context, obj);
2533 return(ret);
2534}
2535
2536/**
2537 * xmlXPathPopNodeSet:
2538 * @ctxt: an XPath parser context
2539 *
2540 * Pops a node-set from the stack, handling conversion if needed.
2541 * Check error with #xmlXPathCheckError.
2542 *
2543 * Returns the node-set
2544 */
2545xmlNodeSetPtr
2546xmlXPathPopNodeSet (xmlXPathParserContextPtr ctxt) {
2547 xmlXPathObjectPtr obj;
2548 xmlNodeSetPtr ret;
2549
2550 if (ctxt == NULL) return(NULL);
2551 if (ctxt->value == NULL) {
2552 xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND);
2553 return(NULL);
2554 }
2555 if (!xmlXPathStackIsNodeSet(ctxt)) {
2556 xmlXPathSetTypeError(ctxt);
2557 return(NULL);
2558 }
2559 obj = valuePop(ctxt);
2560 ret = obj->nodesetval;
2561#if 0
2562 /* to fix memory leak of not clearing obj->user */
2563 if (obj->boolval && obj->user != NULL)
2564 xmlFreeNodeList((xmlNodePtr) obj->user);
2565#endif
2566 obj->nodesetval = NULL;
2567 xmlXPathReleaseObject(ctxt->context, obj);
2568 return(ret);
2569}
2570
2571/**
2572 * xmlXPathPopExternal:
2573 * @ctxt: an XPath parser context
2574 *
2575 * Pops an external object from the stack, handling conversion if needed.
2576 * Check error with #xmlXPathCheckError.
2577 *
2578 * Returns the object
2579 */
2580void *
2581xmlXPathPopExternal (xmlXPathParserContextPtr ctxt) {
2582 xmlXPathObjectPtr obj;
2583 void * ret;
2584
2585 if ((ctxt == NULL) || (ctxt->value == NULL)) {
2586 xmlXPathSetError(ctxt, XPATH_INVALID_OPERAND);
2587 return(NULL);
2588 }
2589 if (ctxt->value->type != XPATH_USERS) {
2590 xmlXPathSetTypeError(ctxt);
2591 return(NULL);
2592 }
2593 obj = valuePop(ctxt);
2594 ret = obj->user;
2595 obj->user = NULL;
2596 xmlXPathReleaseObject(ctxt->context, obj);
2597 return(ret);
2598}
2599
2600/*
2601 * Macros for accessing the content. Those should be used only by the parser,
2602 * and not exported.
2603 *
2604 * Dirty macros, i.e. one need to make assumption on the context to use them
2605 *
2606 * CUR_PTR return the current pointer to the xmlChar to be parsed.
2607 * CUR returns the current xmlChar value, i.e. a 8 bit value
2608 * in ISO-Latin or UTF-8.
2609 * This should be used internally by the parser
2610 * only to compare to ASCII values otherwise it would break when
2611 * running with UTF-8 encoding.
2612 * NXT(n) returns the n'th next xmlChar. Same as CUR is should be used only
2613 * to compare on ASCII based substring.
2614 * SKIP(n) Skip n xmlChar, and must also be used only to skip ASCII defined
2615 * strings within the parser.
2616 * CURRENT Returns the current char value, with the full decoding of
2617 * UTF-8 if we are using this mode. It returns an int.
2618 * NEXT Skip to the next character, this does the proper decoding
2619 * in UTF-8 mode. It also pop-up unfinished entities on the fly.
2620 * It returns the pointer to the current xmlChar.
2621 */
2622
2623#define CUR (*ctxt->cur)
2624#define SKIP(val) ctxt->cur += (val)
2625#define NXT(val) ctxt->cur[(val)]
2626#define CUR_PTR ctxt->cur
2627#define CUR_CHAR(l) xmlXPathCurrentChar(ctxt, &l)
2628
2629#define COPY_BUF(l,b,i,v) \
2630 if (l == 1) b[i++] = (xmlChar) v; \
2631 else i += xmlCopyChar(l,&b[i],v)
2632
2633#define NEXTL(l) ctxt->cur += l
2634
2635#define SKIP_BLANKS \
2636 while (IS_BLANK_CH(*(ctxt->cur))) NEXT
2637
2638#define CURRENT (*ctxt->cur)
2639#define NEXT ((*ctxt->cur) ? ctxt->cur++: ctxt->cur)
2640
2641
2642#ifndef DBL_DIG
2643#define DBL_DIG 16
2644#endif
2645#ifndef DBL_EPSILON
2646#define DBL_EPSILON 1E-9
2647#endif
2648
2649#define UPPER_DOUBLE 1E9
2650#define LOWER_DOUBLE 1E-5
2651#define LOWER_DOUBLE_EXP 5
2652
2653#define INTEGER_DIGITS DBL_DIG
2654#define FRACTION_DIGITS (DBL_DIG + 1 + (LOWER_DOUBLE_EXP))
2655#define EXPONENT_DIGITS (3 + 2)
2656
2657/**
2658 * xmlXPathFormatNumber:
2659 * @number: number to format
2660 * @buffer: output buffer
2661 * @buffersize: size of output buffer
2662 *
2663 * Convert the number into a string representation.
2664 */
2665static void
2666xmlXPathFormatNumber(double number, char buffer[], int buffersize)
2667{
2668 switch (xmlXPathIsInf(number)) {
2669 case 1:
2670 if (buffersize > (int)sizeof("Infinity"))
2671 snprintf(buffer, buffersize, "Infinity");
2672 break;
2673 case -1:
2674 if (buffersize > (int)sizeof("-Infinity"))
2675 snprintf(buffer, buffersize, "-Infinity");
2676 break;
2677 default:
2678 if (xmlXPathIsNaN(number)) {
2679 if (buffersize > (int)sizeof("NaN"))
2680 snprintf(buffer, buffersize, "NaN");
2681 } else if (number == 0 && xmlXPathGetSign(number) != 0) {
2682 snprintf(buffer, buffersize, "0");
2683 } else if (number == ((int) number)) {
2684 char work[30];
2685 char *ptr, *cur;
2686 int value = (int) number;
2687
2688 ptr = &buffer[0];
2689 if (value == 0) {
2690 *ptr++ = '0';
2691 } else {
2692 snprintf(work, 29, "%d", value);
2693 cur = &work[0];
2694 while ((*cur) && (ptr - buffer < buffersize)) {
2695 *ptr++ = *cur++;
2696 }
2697 }
2698 if (ptr - buffer < buffersize) {
2699 *ptr = 0;
2700 } else if (buffersize > 0) {
2701 ptr--;
2702 *ptr = 0;
2703 }
2704 } else {
2705 /*
2706 For the dimension of work,
2707 DBL_DIG is number of significant digits
2708 EXPONENT is only needed for "scientific notation"
2709 3 is sign, decimal point, and terminating zero
2710 LOWER_DOUBLE_EXP is max number of leading zeroes in fraction
2711 Note that this dimension is slightly (a few characters)
2712 larger than actually necessary.
2713 */
2714 char work[DBL_DIG + EXPONENT_DIGITS + 3 + LOWER_DOUBLE_EXP];
2715 int integer_place, fraction_place;
2716 char *ptr;
2717 char *after_fraction;
2718 double absolute_value;
2719 int size;
2720
2721 absolute_value = fabs(number);
2722
2723 /*
2724 * First choose format - scientific or regular floating point.
2725 * In either case, result is in work, and after_fraction points
2726 * just past the fractional part.
2727 */
2728 if ( ((absolute_value > UPPER_DOUBLE) ||
2729 (absolute_value < LOWER_DOUBLE)) &&
2730 (absolute_value != 0.0) ) {
2731 /* Use scientific notation */
2732 integer_place = DBL_DIG + EXPONENT_DIGITS + 1;
2733 fraction_place = DBL_DIG - 1;
2734 size = snprintf(work, sizeof(work),"%*.*e",
2735 integer_place, fraction_place, number);
2736 while ((size > 0) && (work[size] != 'e')) size--;
2737
2738 }
2739 else {
2740 /* Use regular notation */
2741 if (absolute_value > 0.0) {
2742 integer_place = (int)log10(absolute_value);
2743 if (integer_place > 0)
2744 fraction_place = DBL_DIG - integer_place - 1;
2745 else
2746 fraction_place = DBL_DIG - integer_place;
2747 } else {
2748 fraction_place = 1;
2749 }
2750 size = snprintf(work, sizeof(work), "%0.*f",
2751 fraction_place, number);
2752 }
2753
2754 /* Remove fractional trailing zeroes */
2755 after_fraction = work + size;
2756 ptr = after_fraction;
2757 while (*(--ptr) == '0')
2758 ;
2759 if (*ptr != '.')
2760 ptr++;
2761 while ((*ptr++ = *after_fraction++) != 0);
2762
2763 /* Finally copy result back to caller */
2764 size = strlen(work) + 1;
2765 if (size > buffersize) {
2766 work[buffersize - 1] = 0;
2767 size = buffersize;
2768 }
2769 memmove(buffer, work, size);
2770 }
2771 break;
2772 }
2773}
2774
2775
2776/************************************************************************
2777 * *
2778 * Routines to handle NodeSets *
2779 * *
2780 ************************************************************************/
2781
2782/**
2783 * xmlXPathOrderDocElems:
2784 * @doc: an input document
2785 *
2786 * Call this routine to speed up XPath computation on static documents.
2787 * This stamps all the element nodes with the document order
2788 * Like for line information, the order is kept in the element->content
2789 * field, the value stored is actually - the node number (starting at -1)
2790 * to be able to differentiate from line numbers.
2791 *
2792 * Returns the number of elements found in the document or -1 in case
2793 * of error.
2794 */
2795long
2796xmlXPathOrderDocElems(xmlDocPtr doc) {
2797 long count = 0;
2798 xmlNodePtr cur;
2799
2800 if (doc == NULL)
2801 return(-1);
2802 cur = doc->children;
2803 while (cur != NULL) {
2804 if (cur->type == XML_ELEMENT_NODE) {
2805 cur->content = (void *) (-(++count));
2806 if (cur->children != NULL) {
2807 cur = cur->children;
2808 continue;
2809 }
2810 }
2811 if (cur->next != NULL) {
2812 cur = cur->next;
2813 continue;
2814 }
2815 do {
2816 cur = cur->parent;
2817 if (cur == NULL)
2818 break;
2819 if (cur == (xmlNodePtr) doc) {
2820 cur = NULL;
2821 break;
2822 }
2823 if (cur->next != NULL) {
2824 cur = cur->next;
2825 break;
2826 }
2827 } while (cur != NULL);
2828 }
2829 return(count);
2830}
2831
2832/**
2833 * xmlXPathCmpNodes:
2834 * @node1: the first node
2835 * @node2: the second node
2836 *
2837 * Compare two nodes w.r.t document order
2838 *
2839 * Returns -2 in case of error 1 if first point < second point, 0 if
2840 * it's the same node, -1 otherwise
2841 */
2842int
2843xmlXPathCmpNodes(xmlNodePtr node1, xmlNodePtr node2) {
2844 int depth1, depth2;
2845 int attr1 = 0, attr2 = 0;
2846 xmlNodePtr attrNode1 = NULL, attrNode2 = NULL;
2847 xmlNodePtr cur, root;
2848
2849 if ((node1 == NULL) || (node2 == NULL))
2850 return(-2);
2851 /*
2852 * a couple of optimizations which will avoid computations in most cases
2853 */
2854 if (node1 == node2) /* trivial case */
2855 return(0);
2856 if (node1->type == XML_ATTRIBUTE_NODE) {
2857 attr1 = 1;
2858 attrNode1 = node1;
2859 node1 = node1->parent;
2860 }
2861 if (node2->type == XML_ATTRIBUTE_NODE) {
2862 attr2 = 1;
2863 attrNode2 = node2;
2864 node2 = node2->parent;
2865 }
2866 if (node1 == node2) {
2867 if (attr1 == attr2) {
2868 /* not required, but we keep attributes in order */
2869 if (attr1 != 0) {
2870 cur = attrNode2->prev;
2871 while (cur != NULL) {
2872 if (cur == attrNode1)
2873 return (1);
2874 cur = cur->prev;
2875 }
2876 return (-1);
2877 }
2878 return(0);
2879 }
2880 if (attr2 == 1)
2881 return(1);
2882 return(-1);
2883 }
2884 if ((node1->type == XML_NAMESPACE_DECL) ||
2885 (node2->type == XML_NAMESPACE_DECL))
2886 return(1);
2887 if (node1 == node2->prev)
2888 return(1);
2889 if (node1 == node2->next)
2890 return(-1);
2891
2892 /*
2893 * Speedup using document order if availble.
2894 */
2895 if ((node1->type == XML_ELEMENT_NODE) &&
2896 (node2->type == XML_ELEMENT_NODE) &&
2897 (0 > (long) node1->content) &&
2898 (0 > (long) node2->content) &&
2899 (node1->doc == node2->doc)) {
2900 long l1, l2;
2901
2902 l1 = -((long) node1->content);
2903 l2 = -((long) node2->content);
2904 if (l1 < l2)
2905 return(1);
2906 if (l1 > l2)
2907 return(-1);
2908 }
2909
2910 /*
2911 * compute depth to root
2912 */
2913 for (depth2 = 0, cur = node2;cur->parent != NULL;cur = cur->parent) {
2914 if (cur == node1)
2915 return(1);
2916 depth2++;
2917 }
2918 root = cur;
2919 for (depth1 = 0, cur = node1;cur->parent != NULL;cur = cur->parent) {
2920 if (cur == node2)
2921 return(-1);
2922 depth1++;
2923 }
2924 /*
2925 * Distinct document (or distinct entities :-( ) case.
2926 */
2927 if (root != cur) {
2928 return(-2);
2929 }
2930 /*
2931 * get the nearest common ancestor.
2932 */
2933 while (depth1 > depth2) {
2934 depth1--;
2935 node1 = node1->parent;
2936 }
2937 while (depth2 > depth1) {
2938 depth2--;
2939 node2 = node2->parent;
2940 }
2941 while (node1->parent != node2->parent) {
2942 node1 = node1->parent;
2943 node2 = node2->parent;
2944 /* should not happen but just in case ... */
2945 if ((node1 == NULL) || (node2 == NULL))
2946 return(-2);
2947 }
2948 /*
2949 * Find who's first.
2950 */
2951 if (node1 == node2->prev)
2952 return(1);
2953 if (node1 == node2->next)
2954 return(-1);
2955 /*
2956 * Speedup using document order if availble.
2957 */
2958 if ((node1->type == XML_ELEMENT_NODE) &&
2959 (node2->type == XML_ELEMENT_NODE) &&
2960 (0 > (long) node1->content) &&
2961 (0 > (long) node2->content) &&
2962 (node1->doc == node2->doc)) {
2963 long l1, l2;
2964
2965 l1 = -((long) node1->content);
2966 l2 = -((long) node2->content);
2967 if (l1 < l2)
2968 return(1);
2969 if (l1 > l2)
2970 return(-1);
2971 }
2972
2973 for (cur = node1->next;cur != NULL;cur = cur->next)
2974 if (cur == node2)
2975 return(1);
2976 return(-1); /* assume there is no sibling list corruption */
2977}
2978
2979#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON
2980/**
2981 * xmlXPathCmpNodesExt:
2982 * @node1: the first node
2983 * @node2: the second node
2984 *
2985 * Compare two nodes w.r.t document order.
2986 * This one is optimized for handling of non-element nodes.
2987 *
2988 * Returns -2 in case of error 1 if first point < second point, 0 if
2989 * it's the same node, -1 otherwise
2990 */
2991static int
2992xmlXPathCmpNodesExt(xmlNodePtr node1, xmlNodePtr node2) {
2993 int depth1, depth2;
2994 int misc = 0, precedence1 = 0, precedence2 = 0;
2995 xmlNodePtr miscNode1 = NULL, miscNode2 = NULL;
2996 xmlNodePtr cur, root;
2997 long l1, l2;
2998
2999 if ((node1 == NULL) || (node2 == NULL))
3000 return(-2);
3001
3002 if (node1 == node2)
3003 return(0);
3004
3005 /*
3006 * a couple of optimizations which will avoid computations in most cases
3007 */
3008 switch (node1->type) {
3009 case XML_ELEMENT_NODE:
3010 if (node2->type == XML_ELEMENT_NODE) {
3011 if ((0 > (long) node1->content) && /* TODO: Would a != 0 suffice here? */
3012 (0 > (long) node2->content) &&
3013 (node1->doc == node2->doc))
3014 {
3015 l1 = -((long) node1->content);
3016 l2 = -((long) node2->content);
3017 if (l1 < l2)
3018 return(1);
3019 if (l1 > l2)
3020 return(-1);
3021 } else
3022 goto turtle_comparison;
3023 }
3024 break;
3025 case XML_ATTRIBUTE_NODE:
3026 precedence1 = 1; /* element is owner */
3027 miscNode1 = node1;
3028 node1 = node1->parent;
3029 misc = 1;
3030 break;
3031 case XML_TEXT_NODE:
3032 case XML_CDATA_SECTION_NODE:
3033 case XML_COMMENT_NODE:
3034 case XML_PI_NODE: {
3035 miscNode1 = node1;
3036 /*
3037 * Find nearest element node.
3038 */
3039 if (node1->prev != NULL) {
3040 do {
3041 node1 = node1->prev;
3042 if (node1->type == XML_ELEMENT_NODE) {
3043 precedence1 = 3; /* element in prev-sibl axis */
3044 break;
3045 }
3046 if (node1->prev == NULL) {
3047 precedence1 = 2; /* element is parent */
3048 /*
3049 * URGENT TODO: Are there any cases, where the
3050 * parent of such a node is not an element node?
3051 */
3052 node1 = node1->parent;
3053 break;
3054 }
3055 } while (1);
3056 } else {
3057 precedence1 = 2; /* element is parent */
3058 node1 = node1->parent;
3059 }
3060 if ((node1 == NULL) || (node1->type != XML_ELEMENT_NODE) ||
3061 (0 <= (long) node1->content)) {
3062 /*
3063 * Fallback for whatever case.
3064 */
3065 node1 = miscNode1;
3066 precedence1 = 0;
3067 } else
3068 misc = 1;
3069 }
3070 break;
3071 case XML_NAMESPACE_DECL:
3072 /*
3073 * TODO: why do we return 1 for namespace nodes?
3074 */
3075 return(1);
3076 default:
3077 break;
3078 }
3079 switch (node2->type) {
3080 case XML_ELEMENT_NODE:
3081 break;
3082 case XML_ATTRIBUTE_NODE:
3083 precedence2 = 1; /* element is owner */
3084 miscNode2 = node2;
3085 node2 = node2->parent;
3086 misc = 1;
3087 break;
3088 case XML_TEXT_NODE:
3089 case XML_CDATA_SECTION_NODE:
3090 case XML_COMMENT_NODE:
3091 case XML_PI_NODE: {
3092 miscNode2 = node2;
3093 if (node2->prev != NULL) {
3094 do {
3095 node2 = node2->prev;
3096 if (node2->type == XML_ELEMENT_NODE) {
3097 precedence2 = 3; /* element in prev-sibl axis */
3098 break;
3099 }
3100 if (node2->prev == NULL) {
3101 precedence2 = 2; /* element is parent */
3102 node2 = node2->parent;
3103 break;
3104 }
3105 } while (1);
3106 } else {
3107 precedence2 = 2; /* element is parent */
3108 node2 = node2->parent;
3109 }
3110 if ((node2 == NULL) || (node2->type != XML_ELEMENT_NODE) ||
3111 (0 <= (long) node1->content))
3112 {
3113 node2 = miscNode2;
3114 precedence2 = 0;
3115 } else
3116 misc = 1;
3117 }
3118 break;
3119 case XML_NAMESPACE_DECL:
3120 return(1);
3121 default:
3122 break;
3123 }
3124 if (misc) {
3125 if (node1 == node2) {
3126 if (precedence1 == precedence2) {
3127 /*
3128 * The ugly case; but normally there aren't many
3129 * adjacent non-element nodes around.
3130 */
3131 cur = miscNode2->prev;
3132 while (cur != NULL) {
3133 if (cur == miscNode1)
3134 return(1);
3135 if (cur->type == XML_ELEMENT_NODE)
3136 return(-1);
3137 cur = cur->prev;
3138 }
3139 return (-1);
3140 } else {
3141 /*
3142 * Evaluate based on higher precedence wrt to the element.
3143 * TODO: This assumes attributes are sorted before content.
3144 * Is this 100% correct?
3145 */
3146 if (precedence1 < precedence2)
3147 return(1);
3148 else
3149 return(-1);
3150 }
3151 }
3152 /*
3153 * Special case: One of the helper-elements is contained by the other.
3154 * <foo>
3155 * <node2>
3156 * <node1>Text-1(precedence1 == 2)</node1>
3157 * </node2>
3158 * Text-6(precedence2 == 3)
3159 * </foo>
3160 */
3161 if ((precedence2 == 3) && (precedence1 > 1)) {
3162 cur = node1->parent;
3163 while (cur) {
3164 if (cur == node2)
3165 return(1);
3166 cur = cur->parent;
3167 }
3168 }
3169 if ((precedence1 == 3) && (precedence2 > 1)) {
3170 cur = node2->parent;
3171 while (cur) {
3172 if (cur == node1)
3173 return(-1);
3174 cur = cur->parent;
3175 }
3176 }
3177 }
3178
3179 /*
3180 * Speedup using document order if availble.
3181 */
3182 if ((node1->type == XML_ELEMENT_NODE) &&
3183 (node2->type == XML_ELEMENT_NODE) &&
3184 (0 > (long) node1->content) &&
3185 (0 > (long) node2->content) &&
3186 (node1->doc == node2->doc)) {
3187
3188 l1 = -((long) node1->content);
3189 l2 = -((long) node2->content);
3190 if (l1 < l2)
3191 return(1);
3192 if (l1 > l2)
3193 return(-1);
3194 }
3195
3196turtle_comparison:
3197
3198 if (node1 == node2->prev)
3199 return(1);
3200 if (node1 == node2->next)
3201 return(-1);
3202 /*
3203 * compute depth to root
3204 */
3205 for (depth2 = 0, cur = node2;cur->parent != NULL;cur = cur->parent) {
3206 if (cur == node1)
3207 return(1);
3208 depth2++;
3209 }
3210 root = cur;
3211 for (depth1 = 0, cur = node1;cur->parent != NULL;cur = cur->parent) {
3212 if (cur == node2)
3213 return(-1);
3214 depth1++;
3215 }
3216 /*
3217 * Distinct document (or distinct entities :-( ) case.
3218 */
3219 if (root != cur) {
3220 return(-2);
3221 }
3222 /*
3223 * get the nearest common ancestor.
3224 */
3225 while (depth1 > depth2) {
3226 depth1--;
3227 node1 = node1->parent;
3228 }
3229 while (depth2 > depth1) {
3230 depth2--;
3231 node2 = node2->parent;
3232 }
3233 while (node1->parent != node2->parent) {
3234 node1 = node1->parent;
3235 node2 = node2->parent;
3236 /* should not happen but just in case ... */
3237 if ((node1 == NULL) || (node2 == NULL))
3238 return(-2);
3239 }
3240 /*
3241 * Find who's first.
3242 */
3243 if (node1 == node2->prev)
3244 return(1);
3245 if (node1 == node2->next)
3246 return(-1);
3247 /*
3248 * Speedup using document order if availble.
3249 */
3250 if ((node1->type == XML_ELEMENT_NODE) &&
3251 (node2->type == XML_ELEMENT_NODE) &&
3252 (0 > (long) node1->content) &&
3253 (0 > (long) node2->content) &&
3254 (node1->doc == node2->doc)) {
3255
3256 l1 = -((long) node1->content);
3257 l2 = -((long) node2->content);
3258 if (l1 < l2)
3259 return(1);
3260 if (l1 > l2)
3261 return(-1);
3262 }
3263
3264 for (cur = node1->next;cur != NULL;cur = cur->next)
3265 if (cur == node2)
3266 return(1);
3267 return(-1); /* assume there is no sibling list corruption */
3268}
3269#endif /* XP_OPTIMIZED_NON_ELEM_COMPARISON */
3270
3271/**
3272 * xmlXPathNodeSetSort:
3273 * @set: the node set
3274 *
3275 * Sort the node set in document order
3276 */
3277void
3278xmlXPathNodeSetSort(xmlNodeSetPtr set) {
3279 int i, j, incr, len;
3280 xmlNodePtr tmp;
3281
3282 if (set == NULL)
3283 return;
3284
3285 /* Use Shell's sort to sort the node-set */
3286 len = set->nodeNr;
3287 for (incr = len / 2; incr > 0; incr /= 2) {
3288 for (i = incr; i < len; i++) {
3289 j = i - incr;
3290 while (j >= 0) {
3291#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON
3292 if (xmlXPathCmpNodesExt(set->nodeTab[j],
3293 set->nodeTab[j + incr]) == -1)
3294#else
3295 if (xmlXPathCmpNodes(set->nodeTab[j],
3296 set->nodeTab[j + incr]) == -1)
3297#endif
3298 {
3299 tmp = set->nodeTab[j];
3300 set->nodeTab[j] = set->nodeTab[j + incr];
3301 set->nodeTab[j + incr] = tmp;
3302 j -= incr;
3303 } else
3304 break;
3305 }
3306 }
3307 }
3308}
3309
3310#define XML_NODESET_DEFAULT 10
3311/**
3312 * xmlXPathNodeSetDupNs:
3313 * @node: the parent node of the namespace XPath node
3314 * @ns: the libxml namespace declaration node.
3315 *
3316 * Namespace node in libxml don't match the XPath semantic. In a node set
3317 * the namespace nodes are duplicated and the next pointer is set to the
3318 * parent node in the XPath semantic.
3319 *
3320 * Returns the newly created object.
3321 */
3322static xmlNodePtr
3323xmlXPathNodeSetDupNs(xmlNodePtr node, xmlNsPtr ns) {
3324 xmlNsPtr cur;
3325
3326 if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL))
3327 return(NULL);
3328 if ((node == NULL) || (node->type == XML_NAMESPACE_DECL))
3329 return((xmlNodePtr) ns);
3330
3331 /*
3332 * Allocate a new Namespace and fill the fields.
3333 */
3334 cur = (xmlNsPtr) xmlMalloc(sizeof(xmlNs));
3335 if (cur == NULL) {
3336 xmlXPathErrMemory(NULL, "duplicating namespace\n");
3337 return(NULL);
3338 }
3339 memset(cur, 0, sizeof(xmlNs));
3340 cur->type = XML_NAMESPACE_DECL;
3341 if (ns->href != NULL)
3342 cur->href = xmlStrdup(ns->href);
3343 if (ns->prefix != NULL)
3344 cur->prefix = xmlStrdup(ns->prefix);
3345 cur->next = (xmlNsPtr) node;
3346 return((xmlNodePtr) cur);
3347}
3348
3349/**
3350 * xmlXPathNodeSetFreeNs:
3351 * @ns: the XPath namespace node found in a nodeset.
3352 *
3353 * Namespace nodes in libxml don't match the XPath semantic. In a node set
3354 * the namespace nodes are duplicated and the next pointer is set to the
3355 * parent node in the XPath semantic. Check if such a node needs to be freed
3356 */
3357void
3358xmlXPathNodeSetFreeNs(xmlNsPtr ns) {
3359 if ((ns == NULL) || (ns->type != XML_NAMESPACE_DECL))
3360 return;
3361
3362 if ((ns->next != NULL) && (ns->next->type != XML_NAMESPACE_DECL)) {
3363 if (ns->href != NULL)
3364 xmlFree((xmlChar *)ns->href);
3365 if (ns->prefix != NULL)
3366 xmlFree((xmlChar *)ns->prefix);
3367 xmlFree(ns);
3368 }
3369}
3370
3371/**
3372 * xmlXPathNodeSetCreate:
3373 * @val: an initial xmlNodePtr, or NULL
3374 *
3375 * Create a new xmlNodeSetPtr of type double and of value @val
3376 *
3377 * Returns the newly created object.
3378 */
3379xmlNodeSetPtr
3380xmlXPathNodeSetCreate(xmlNodePtr val) {
3381 xmlNodeSetPtr ret;
3382
3383 ret = (xmlNodeSetPtr) xmlMalloc(sizeof(xmlNodeSet));
3384 if (ret == NULL) {
3385 xmlXPathErrMemory(NULL, "creating nodeset\n");
3386 return(NULL);
3387 }
3388 memset(ret, 0 , (size_t) sizeof(xmlNodeSet));
3389 if (val != NULL) {
3390 ret->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3391 sizeof(xmlNodePtr));
3392 if (ret->nodeTab == NULL) {
3393 xmlXPathErrMemory(NULL, "creating nodeset\n");
3394 xmlFree(ret);
3395 return(NULL);
3396 }
3397 memset(ret->nodeTab, 0 ,
3398 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3399 ret->nodeMax = XML_NODESET_DEFAULT;
3400 if (val->type == XML_NAMESPACE_DECL) {
3401 xmlNsPtr ns = (xmlNsPtr) val;
3402
3403 ret->nodeTab[ret->nodeNr++] =
3404 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3405 } else
3406 ret->nodeTab[ret->nodeNr++] = val;
3407 }
3408 return(ret);
3409}
3410
3411/**
3412 * xmlXPathNodeSetCreateSize:
3413 * @size: the initial size of the set
3414 *
3415 * Create a new xmlNodeSetPtr of type double and of value @val
3416 *
3417 * Returns the newly created object.
3418 */
3419static xmlNodeSetPtr
3420xmlXPathNodeSetCreateSize(int size) {
3421 xmlNodeSetPtr ret;
3422
3423 ret = (xmlNodeSetPtr) xmlMalloc(sizeof(xmlNodeSet));
3424 if (ret == NULL) {
3425 xmlXPathErrMemory(NULL, "creating nodeset\n");
3426 return(NULL);
3427 }
3428 memset(ret, 0 , (size_t) sizeof(xmlNodeSet));
3429 if (size < XML_NODESET_DEFAULT)
3430 size = XML_NODESET_DEFAULT;
3431 ret->nodeTab = (xmlNodePtr *) xmlMalloc(size * sizeof(xmlNodePtr));
3432 if (ret->nodeTab == NULL) {
3433 xmlXPathErrMemory(NULL, "creating nodeset\n");
3434 xmlFree(ret);
3435 return(NULL);
3436 }
3437 memset(ret->nodeTab, 0 , size * (size_t) sizeof(xmlNodePtr));
3438 ret->nodeMax = size;
3439 return(ret);
3440}
3441
3442/**
3443 * xmlXPathNodeSetContains:
3444 * @cur: the node-set
3445 * @val: the node
3446 *
3447 * checks whether @cur contains @val
3448 *
3449 * Returns true (1) if @cur contains @val, false (0) otherwise
3450 */
3451int
3452xmlXPathNodeSetContains (xmlNodeSetPtr cur, xmlNodePtr val) {
3453 int i;
3454
3455 if ((cur == NULL) || (val == NULL)) return(0);
3456 if (val->type == XML_NAMESPACE_DECL) {
3457 for (i = 0; i < cur->nodeNr; i++) {
3458 if (cur->nodeTab[i]->type == XML_NAMESPACE_DECL) {
3459 xmlNsPtr ns1, ns2;
3460
3461 ns1 = (xmlNsPtr) val;
3462 ns2 = (xmlNsPtr) cur->nodeTab[i];
3463 if (ns1 == ns2)
3464 return(1);
3465 if ((ns1->next != NULL) && (ns2->next == ns1->next) &&
3466 (xmlStrEqual(ns1->prefix, ns2->prefix)))
3467 return(1);
3468 }
3469 }
3470 } else {
3471 for (i = 0; i < cur->nodeNr; i++) {
3472 if (cur->nodeTab[i] == val)
3473 return(1);
3474 }
3475 }
3476 return(0);
3477}
3478
3479/**
3480 * xmlXPathNodeSetAddNs:
3481 * @cur: the initial node set
3482 * @node: the hosting node
3483 * @ns: a the namespace node
3484 *
3485 * add a new namespace node to an existing NodeSet
3486 */
3487void
3488xmlXPathNodeSetAddNs(xmlNodeSetPtr cur, xmlNodePtr node, xmlNsPtr ns) {
3489 int i;
3490
3491
3492 if ((cur == NULL) || (ns == NULL) || (node == NULL) ||
3493 (ns->type != XML_NAMESPACE_DECL) ||
3494 (node->type != XML_ELEMENT_NODE))
3495 return;
3496
3497 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
3498 /*
3499 * prevent duplicates
3500 */
3501 for (i = 0;i < cur->nodeNr;i++) {
3502 if ((cur->nodeTab[i] != NULL) &&
3503 (cur->nodeTab[i]->type == XML_NAMESPACE_DECL) &&
3504 (((xmlNsPtr)cur->nodeTab[i])->next == (xmlNsPtr) node) &&
3505 (xmlStrEqual(ns->prefix, ((xmlNsPtr)cur->nodeTab[i])->prefix)))
3506 return;
3507 }
3508
3509 /*
3510 * grow the nodeTab if needed
3511 */
3512 if (cur->nodeMax == 0) {
3513 cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3514 sizeof(xmlNodePtr));
3515 if (cur->nodeTab == NULL) {
3516 xmlXPathErrMemory(NULL, "growing nodeset\n");
3517 return;
3518 }
3519 memset(cur->nodeTab, 0 ,
3520 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3521 cur->nodeMax = XML_NODESET_DEFAULT;
3522 } else if (cur->nodeNr == cur->nodeMax) {
3523 xmlNodePtr *temp;
3524
3525 cur->nodeMax *= 2;
3526 temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax *
3527 sizeof(xmlNodePtr));
3528 if (temp == NULL) {
3529 xmlXPathErrMemory(NULL, "growing nodeset\n");
3530 return;
3531 }
3532 cur->nodeTab = temp;
3533 }
3534 cur->nodeTab[cur->nodeNr++] = xmlXPathNodeSetDupNs(node, ns);
3535}
3536
3537/**
3538 * xmlXPathNodeSetAdd:
3539 * @cur: the initial node set
3540 * @val: a new xmlNodePtr
3541 *
3542 * add a new xmlNodePtr to an existing NodeSet
3543 */
3544void
3545xmlXPathNodeSetAdd(xmlNodeSetPtr cur, xmlNodePtr val) {
3546 int i;
3547
3548 if ((cur == NULL) || (val == NULL)) return;
3549
3550#if 0
3551 if ((val->type == XML_ELEMENT_NODE) && (val->name[0] == ' '))
3552 return; /* an XSLT fake node */
3553#endif
3554
3555 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
3556 /*
3557 * prevent duplcates
3558 */
3559 for (i = 0;i < cur->nodeNr;i++)
3560 if (cur->nodeTab[i] == val) return;
3561
3562 /*
3563 * grow the nodeTab if needed
3564 */
3565 if (cur->nodeMax == 0) {
3566 cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3567 sizeof(xmlNodePtr));
3568 if (cur->nodeTab == NULL) {
3569 xmlXPathErrMemory(NULL, "growing nodeset\n");
3570 return;
3571 }
3572 memset(cur->nodeTab, 0 ,
3573 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3574 cur->nodeMax = XML_NODESET_DEFAULT;
3575 } else if (cur->nodeNr == cur->nodeMax) {
3576 xmlNodePtr *temp;
3577
3578 cur->nodeMax *= 2;
3579 temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax *
3580 sizeof(xmlNodePtr));
3581 if (temp == NULL) {
3582 xmlXPathErrMemory(NULL, "growing nodeset\n");
3583 return;
3584 }
3585 cur->nodeTab = temp;
3586 }
3587 if (val->type == XML_NAMESPACE_DECL) {
3588 xmlNsPtr ns = (xmlNsPtr) val;
3589
3590 cur->nodeTab[cur->nodeNr++] =
3591 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3592 } else
3593 cur->nodeTab[cur->nodeNr++] = val;
3594}
3595
3596/**
3597 * xmlXPathNodeSetAddUnique:
3598 * @cur: the initial node set
3599 * @val: a new xmlNodePtr
3600 *
3601 * add a new xmlNodePtr to an existing NodeSet, optimized version
3602 * when we are sure the node is not already in the set.
3603 */
3604void
3605xmlXPathNodeSetAddUnique(xmlNodeSetPtr cur, xmlNodePtr val) {
3606 if ((cur == NULL) || (val == NULL)) return;
3607
3608#if 0
3609 if ((val->type == XML_ELEMENT_NODE) && (val->name[0] == ' '))
3610 return; /* an XSLT fake node */
3611#endif
3612
3613 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
3614 /*
3615 * grow the nodeTab if needed
3616 */
3617 if (cur->nodeMax == 0) {
3618 cur->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3619 sizeof(xmlNodePtr));
3620 if (cur->nodeTab == NULL) {
3621 xmlXPathErrMemory(NULL, "growing nodeset\n");
3622 return;
3623 }
3624 memset(cur->nodeTab, 0 ,
3625 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3626 cur->nodeMax = XML_NODESET_DEFAULT;
3627 } else if (cur->nodeNr == cur->nodeMax) {
3628 xmlNodePtr *temp;
3629
3630 cur->nodeMax *= 2;
3631 temp = (xmlNodePtr *) xmlRealloc(cur->nodeTab, cur->nodeMax *
3632 sizeof(xmlNodePtr));
3633 if (temp == NULL) {
3634 xmlXPathErrMemory(NULL, "growing nodeset\n");
3635 return;
3636 }
3637 cur->nodeTab = temp;
3638 }
3639 if (val->type == XML_NAMESPACE_DECL) {
3640 xmlNsPtr ns = (xmlNsPtr) val;
3641
3642 cur->nodeTab[cur->nodeNr++] =
3643 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3644 } else
3645 cur->nodeTab[cur->nodeNr++] = val;
3646}
3647
3648/**
3649 * xmlXPathNodeSetMerge:
3650 * @val1: the first NodeSet or NULL
3651 * @val2: the second NodeSet
3652 *
3653 * Merges two nodesets, all nodes from @val2 are added to @val1
3654 * if @val1 is NULL, a new set is created and copied from @val2
3655 *
3656 * Returns @val1 once extended or NULL in case of error.
3657 */
3658xmlNodeSetPtr
3659xmlXPathNodeSetMerge(xmlNodeSetPtr val1, xmlNodeSetPtr val2) {
3660 int i, j, initNr, skip;
3661 xmlNodePtr n1, n2;
3662
3663 if (val2 == NULL) return(val1);
3664 if (val1 == NULL) {
3665 val1 = xmlXPathNodeSetCreate(NULL);
3666#if 0
3667 /*
3668 * TODO: The optimization won't work in every case, since
3669 * those nasty namespace nodes need to be added with
3670 * xmlXPathNodeSetDupNs() to the set; thus a pure
3671 * memcpy is not possible.
3672 * If there was a flag on the nodesetval, indicating that
3673 * some temporary nodes are in, that would be helpfull.
3674 */
3675 /*
3676 * Optimization: Create an equally sized node-set
3677 * and memcpy the content.
3678 */
3679 val1 = xmlXPathNodeSetCreateSize(val2->nodeNr);
3680 if (val1 == NULL)
3681 return(NULL);
3682 if (val2->nodeNr != 0) {
3683 if (val2->nodeNr == 1)
3684 *(val1->nodeTab) = *(val2->nodeTab);
3685 else {
3686 memcpy(val1->nodeTab, val2->nodeTab,
3687 val2->nodeNr * sizeof(xmlNodePtr));
3688 }
3689 val1->nodeNr = val2->nodeNr;
3690 }
3691 return(val1);
3692#endif
3693 }
3694
3695 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
3696 initNr = val1->nodeNr;
3697
3698 for (i = 0;i < val2->nodeNr;i++) {
3699 n2 = val2->nodeTab[i];
3700 /*
3701 * check against duplicates
3702 */
3703 skip = 0;
3704 for (j = 0; j < initNr; j++) {
3705 n1 = val1->nodeTab[j];
3706 if (n1 == n2) {
3707 skip = 1;
3708 break;
3709 } else if ((n1->type == XML_NAMESPACE_DECL) &&
3710 (n2->type == XML_NAMESPACE_DECL)) {
3711 if ((((xmlNsPtr) n1)->next == ((xmlNsPtr) n2)->next) &&
3712 (xmlStrEqual(((xmlNsPtr) n1)->prefix,
3713 ((xmlNsPtr) n2)->prefix)))
3714 {
3715 skip = 1;
3716 break;
3717 }
3718 }
3719 }
3720 if (skip)
3721 continue;
3722
3723 /*
3724 * grow the nodeTab if needed
3725 */
3726 if (val1->nodeMax == 0) {
3727 val1->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3728 sizeof(xmlNodePtr));
3729 if (val1->nodeTab == NULL) {
3730 xmlXPathErrMemory(NULL, "merging nodeset\n");
3731 return(NULL);
3732 }
3733 memset(val1->nodeTab, 0 ,
3734 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3735 val1->nodeMax = XML_NODESET_DEFAULT;
3736 } else if (val1->nodeNr == val1->nodeMax) {
3737 xmlNodePtr *temp;
3738
3739 val1->nodeMax *= 2;
3740 temp = (xmlNodePtr *) xmlRealloc(val1->nodeTab, val1->nodeMax *
3741 sizeof(xmlNodePtr));
3742 if (temp == NULL) {
3743 xmlXPathErrMemory(NULL, "merging nodeset\n");
3744 return(NULL);
3745 }
3746 val1->nodeTab = temp;
3747 }
3748 if (n2->type == XML_NAMESPACE_DECL) {
3749 xmlNsPtr ns = (xmlNsPtr) n2;
3750
3751 val1->nodeTab[val1->nodeNr++] =
3752 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3753 } else
3754 val1->nodeTab[val1->nodeNr++] = n2;
3755 }
3756
3757 return(val1);
3758}
3759
3760#if 0 /* xmlXPathNodeSetMergeUnique() is currently not used anymore */
3761/**
3762 * xmlXPathNodeSetMergeUnique:
3763 * @val1: the first NodeSet or NULL
3764 * @val2: the second NodeSet
3765 *
3766 * Merges two nodesets, all nodes from @val2 are added to @val1
3767 * if @val1 is NULL, a new set is created and copied from @val2
3768 *
3769 * Returns @val1 once extended or NULL in case of error.
3770 */
3771static xmlNodeSetPtr
3772xmlXPathNodeSetMergeUnique(xmlNodeSetPtr val1, xmlNodeSetPtr val2) {
3773 int i;
3774
3775 if (val2 == NULL) return(val1);
3776 if (val1 == NULL) {
3777 val1 = xmlXPathNodeSetCreate(NULL);
3778 }
3779
3780 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
3781
3782 for (i = 0;i < val2->nodeNr;i++) {
3783 /*
3784 * grow the nodeTab if needed
3785 */
3786 if (val1->nodeMax == 0) {
3787 val1->nodeTab = (xmlNodePtr *) xmlMalloc(XML_NODESET_DEFAULT *
3788 sizeof(xmlNodePtr));
3789 if (val1->nodeTab == NULL) {
3790 xmlXPathErrMemory(NULL, "merging nodeset\n");
3791 return(NULL);
3792 }
3793 memset(val1->nodeTab, 0 ,
3794 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3795 val1->nodeMax = XML_NODESET_DEFAULT;
3796 } else if (val1->nodeNr == val1->nodeMax) {
3797 xmlNodePtr *temp;
3798
3799 val1->nodeMax *= 2;
3800 temp = (xmlNodePtr *) xmlRealloc(val1->nodeTab, val1->nodeMax *
3801 sizeof(xmlNodePtr));
3802 if (temp == NULL) {
3803 xmlXPathErrMemory(NULL, "merging nodeset\n");
3804 return(NULL);
3805 }
3806 val1->nodeTab = temp;
3807 }
3808 if (val2->nodeTab[i]->type == XML_NAMESPACE_DECL) {
3809 xmlNsPtr ns = (xmlNsPtr) val2->nodeTab[i];
3810
3811 val1->nodeTab[val1->nodeNr++] =
3812 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3813 } else
3814 val1->nodeTab[val1->nodeNr++] = val2->nodeTab[i];
3815 }
3816
3817 return(val1);
3818}
3819#endif /* xmlXPathNodeSetMergeUnique() is currently not used anymore */
3820
3821/**
3822 * xmlXPathNodeSetMergeAndClear:
3823 * @set1: the first NodeSet or NULL
3824 * @set2: the second NodeSet
3825 * @hasSet2NsNodes: 1 if set2 contains namespaces nodes
3826 *
3827 * Merges two nodesets, all nodes from @set2 are added to @set1
3828 * if @set1 is NULL, a new set is created and copied from @set2.
3829 * Checks for duplicate nodes. Clears set2.
3830 *
3831 * Returns @set1 once extended or NULL in case of error.
3832 */
3833static xmlNodeSetPtr
3834xmlXPathNodeSetMergeAndClear(xmlNodeSetPtr set1, xmlNodeSetPtr set2,
3835 int hasNullEntries)
3836{
3837 if ((set1 == NULL) && (hasNullEntries == 0)) {
3838 /*
3839 * Note that doing a memcpy of the list, namespace nodes are
3840 * just assigned to set1, since set2 is cleared anyway.
3841 */
3842 set1 = xmlXPathNodeSetCreateSize(set2->nodeNr);
3843 if (set1 == NULL)
3844 return(NULL);
3845 if (set2->nodeNr != 0) {
3846 memcpy(set1->nodeTab, set2->nodeTab,
3847 set2->nodeNr * sizeof(xmlNodePtr));
3848 set1->nodeNr = set2->nodeNr;
3849 }
3850 } else {
3851 int i, j, initNbSet1;
3852 xmlNodePtr n1, n2;
3853
3854 if (set1 == NULL)
3855 set1 = xmlXPathNodeSetCreate(NULL);
3856
3857 initNbSet1 = set1->nodeNr;
3858 for (i = 0;i < set2->nodeNr;i++) {
3859 n2 = set2->nodeTab[i];
3860 /*
3861 * Skip NULLed entries.
3862 */
3863 if (n2 == NULL)
3864 continue;
3865 /*
3866 * Skip duplicates.
3867 */
3868 for (j = 0; j < initNbSet1; j++) {
3869 n1 = set1->nodeTab[j];
3870 if (n1 == n2) {
3871 goto skip_node;
3872 } else if ((n1->type == XML_NAMESPACE_DECL) &&
3873 (n2->type == XML_NAMESPACE_DECL))
3874 {
3875 if ((((xmlNsPtr) n1)->next == ((xmlNsPtr) n2)->next) &&
3876 (xmlStrEqual(((xmlNsPtr) n1)->prefix,
3877 ((xmlNsPtr) n2)->prefix)))
3878 {
3879 /*
3880 * Free the namespace node.
3881 */
3882 set2->nodeTab[i] = NULL;
3883 xmlXPathNodeSetFreeNs((xmlNsPtr) n2);
3884 goto skip_node;
3885 }
3886 }
3887 }
3888 /*
3889 * grow the nodeTab if needed
3890 */
3891 if (set1->nodeMax == 0) {
3892 set1->nodeTab = (xmlNodePtr *) xmlMalloc(
3893 XML_NODESET_DEFAULT * sizeof(xmlNodePtr));
3894 if (set1->nodeTab == NULL) {
3895 xmlXPathErrMemory(NULL, "merging nodeset\n");
3896 return(NULL);
3897 }
3898 memset(set1->nodeTab, 0,
3899 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3900 set1->nodeMax = XML_NODESET_DEFAULT;
3901 } else if (set1->nodeNr >= set1->nodeMax) {
3902 xmlNodePtr *temp;
3903
3904 set1->nodeMax *= 2;
3905 temp = (xmlNodePtr *) xmlRealloc(
3906 set1->nodeTab, set1->nodeMax * sizeof(xmlNodePtr));
3907 if (temp == NULL) {
3908 xmlXPathErrMemory(NULL, "merging nodeset\n");
3909 return(NULL);
3910 }
3911 set1->nodeTab = temp;
3912 }
3913 if (n2->type == XML_NAMESPACE_DECL) {
3914 xmlNsPtr ns = (xmlNsPtr) n2;
3915
3916 set1->nodeTab[set1->nodeNr++] =
3917 xmlXPathNodeSetDupNs((xmlNodePtr) ns->next, ns);
3918 } else
3919 set1->nodeTab[set1->nodeNr++] = n2;
3920skip_node:
3921 {}
3922 }
3923 }
3924 set2->nodeNr = 0;
3925 return(set1);
3926}
3927
3928/**
3929 * xmlXPathNodeSetMergeAndClearNoDupls:
3930 * @set1: the first NodeSet or NULL
3931 * @set2: the second NodeSet
3932 * @hasSet2NsNodes: 1 if set2 contains namespaces nodes
3933 *
3934 * Merges two nodesets, all nodes from @set2 are added to @set1
3935 * if @set1 is NULL, a new set is created and copied from @set2.
3936 * Doesn't chack for duplicate nodes. Clears set2.
3937 *
3938 * Returns @set1 once extended or NULL in case of error.
3939 */
3940static xmlNodeSetPtr
3941xmlXPathNodeSetMergeAndClearNoDupls(xmlNodeSetPtr set1, xmlNodeSetPtr set2,
3942 int hasNullEntries)
3943{
3944 if (set2 == NULL)
3945 return(set1);
3946 if ((set1 == NULL) && (hasNullEntries == 0)) {
3947 /*
3948 * Note that doing a memcpy of the list, namespace nodes are
3949 * just assigned to set1, since set2 is cleared anyway.
3950 */
3951 set1 = xmlXPathNodeSetCreateSize(set2->nodeNr);
3952 if (set1 == NULL)
3953 return(NULL);
3954 if (set2->nodeNr != 0) {
3955 memcpy(set1->nodeTab, set2->nodeTab,
3956 set2->nodeNr * sizeof(xmlNodePtr));
3957 set1->nodeNr = set2->nodeNr;
3958 }
3959 } else {
3960 int i;
3961 xmlNodePtr n2;
3962
3963 if (set1 == NULL)
3964 set1 = xmlXPathNodeSetCreate(NULL);
3965
3966 for (i = 0;i < set2->nodeNr;i++) {
3967 n2 = set2->nodeTab[i];
3968 /*
3969 * Skip NULLed entries.
3970 */
3971 if (n2 == NULL)
3972 continue;
3973 if (set1->nodeMax == 0) {
3974 set1->nodeTab = (xmlNodePtr *) xmlMalloc(
3975 XML_NODESET_DEFAULT * sizeof(xmlNodePtr));
3976 if (set1->nodeTab == NULL) {
3977 xmlXPathErrMemory(NULL, "merging nodeset\n");
3978 return(NULL);
3979 }
3980 memset(set1->nodeTab, 0,
3981 XML_NODESET_DEFAULT * (size_t) sizeof(xmlNodePtr));
3982 set1->nodeMax = XML_NODESET_DEFAULT;
3983 } else if (set1->nodeNr >= set1->nodeMax) {
3984 xmlNodePtr *temp;
3985
3986 set1->nodeMax *= 2;
3987 temp = (xmlNodePtr *) xmlRealloc(
3988 set1->nodeTab, set1->nodeMax * sizeof(xmlNodePtr));
3989 if (temp == NULL) {
3990 xmlXPathErrMemory(NULL, "merging nodeset\n");
3991 return(NULL);
3992 }
3993 set1->nodeTab = temp;
3994 }
3995 set1->nodeTab[set1->nodeNr++] = n2;
3996 }
3997 }
3998 set2->nodeNr = 0;
3999 return(set1);
4000}
4001
4002/**
4003 * xmlXPathNodeSetDel:
4004 * @cur: the initial node set
4005 * @val: an xmlNodePtr
4006 *
4007 * Removes an xmlNodePtr from an existing NodeSet
4008 */
4009void
4010xmlXPathNodeSetDel(xmlNodeSetPtr cur, xmlNodePtr val) {
4011 int i;
4012
4013 if (cur == NULL) return;
4014 if (val == NULL) return;
4015
4016 /*
4017 * find node in nodeTab
4018 */
4019 for (i = 0;i < cur->nodeNr;i++)
4020 if (cur->nodeTab[i] == val) break;
4021
4022 if (i >= cur->nodeNr) { /* not found */
4023#ifdef DEBUG
4024 xmlGenericError(xmlGenericErrorContext,
4025 "xmlXPathNodeSetDel: Node %s wasn't found in NodeList\n",
4026 val->name);
4027#endif
4028 return;
4029 }
4030 if ((cur->nodeTab[i] != NULL) &&
4031 (cur->nodeTab[i]->type == XML_NAMESPACE_DECL))
4032 xmlXPathNodeSetFreeNs((xmlNsPtr) cur->nodeTab[i]);
4033 cur->nodeNr--;
4034 for (;i < cur->nodeNr;i++)
4035 cur->nodeTab[i] = cur->nodeTab[i + 1];
4036 cur->nodeTab[cur->nodeNr] = NULL;
4037}
4038
4039/**
4040 * xmlXPathNodeSetRemove:
4041 * @cur: the initial node set
4042 * @val: the index to remove
4043 *
4044 * Removes an entry from an existing NodeSet list.
4045 */
4046void
4047xmlXPathNodeSetRemove(xmlNodeSetPtr cur, int val) {
4048 if (cur == NULL) return;
4049 if (val >= cur->nodeNr) return;
4050 if ((cur->nodeTab[val] != NULL) &&
4051 (cur->nodeTab[val]->type == XML_NAMESPACE_DECL))
4052 xmlXPathNodeSetFreeNs((xmlNsPtr) cur->nodeTab[val]);
4053 cur->nodeNr--;
4054 for (;val < cur->nodeNr;val++)
4055 cur->nodeTab[val] = cur->nodeTab[val + 1];
4056 cur->nodeTab[cur->nodeNr] = NULL;
4057}
4058
4059/**
4060 * xmlXPathFreeNodeSet:
4061 * @obj: the xmlNodeSetPtr to free
4062 *
4063 * Free the NodeSet compound (not the actual nodes !).
4064 */
4065void
4066xmlXPathFreeNodeSet(xmlNodeSetPtr obj) {
4067 if (obj == NULL) return;
4068 if (obj->nodeTab != NULL) {
4069 int i;
4070
4071 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
4072 for (i = 0;i < obj->nodeNr;i++)
4073 if ((obj->nodeTab[i] != NULL) &&
4074 (obj->nodeTab[i]->type == XML_NAMESPACE_DECL))
4075 xmlXPathNodeSetFreeNs((xmlNsPtr) obj->nodeTab[i]);
4076 xmlFree(obj->nodeTab);
4077 }
4078 xmlFree(obj);
4079}
4080
4081/**
4082 * xmlXPathNodeSetClear:
4083 * @set: the node set to clear
4084 *
4085 * Clears the list from all temporary XPath objects (e.g. namespace nodes
4086 * are feed), but does *not* free the list itself. Sets the length of the
4087 * list to 0.
4088 */
4089static void
4090xmlXPathNodeSetClear(xmlNodeSetPtr set, int hasNsNodes)
4091{
4092 if ((set == NULL) || (set->nodeNr <= 0))
4093 return;
4094 else if (hasNsNodes) {
4095 int i;
4096 xmlNodePtr node;
4097
4098 for (i = 0; i < set->nodeNr; i++) {
4099 node = set->nodeTab[i];
4100 if ((node != NULL) &&
4101 (node->type == XML_NAMESPACE_DECL))
4102 xmlXPathNodeSetFreeNs((xmlNsPtr) node);
4103 }
4104 }
4105 set->nodeNr = 0;
4106}
4107
4108/**
4109 * xmlXPathNodeSetClearFromPos:
4110 * @set: the node set to be cleared
4111 * @pos: the start position to clear from
4112 *
4113 * Clears the list from temporary XPath objects (e.g. namespace nodes
4114 * are feed) starting with the entry at @pos, but does *not* free the list
4115 * itself. Sets the length of the list to @pos.
4116 */
4117static void
4118xmlXPathNodeSetClearFromPos(xmlNodeSetPtr set, int pos, int hasNsNodes)
4119{
4120 if ((set == NULL) || (set->nodeNr <= 0) || (pos >= set->nodeNr))
4121 return;
4122 else if ((hasNsNodes)) {
4123 int i;
4124 xmlNodePtr node;
4125
4126 for (i = pos; i < set->nodeNr; i++) {
4127 node = set->nodeTab[i];
4128 if ((node != NULL) &&
4129 (node->type == XML_NAMESPACE_DECL))
4130 xmlXPathNodeSetFreeNs((xmlNsPtr) node);
4131 }
4132 }
4133 set->nodeNr = pos;
4134}
4135
4136/**
4137 * xmlXPathFreeValueTree:
4138 * @obj: the xmlNodeSetPtr to free
4139 *
4140 * Free the NodeSet compound and the actual tree, this is different
4141 * from xmlXPathFreeNodeSet()
4142 */
4143static void
4144xmlXPathFreeValueTree(xmlNodeSetPtr obj) {
4145 int i;
4146
4147 if (obj == NULL) return;
4148
4149 if (obj->nodeTab != NULL) {
4150 for (i = 0;i < obj->nodeNr;i++) {
4151 if (obj->nodeTab[i] != NULL) {
4152 if (obj->nodeTab[i]->type == XML_NAMESPACE_DECL) {
4153 xmlXPathNodeSetFreeNs((xmlNsPtr) obj->nodeTab[i]);
4154 } else {
4155 xmlFreeNodeList(obj->nodeTab[i]);
4156 }
4157 }
4158 }
4159 xmlFree(obj->nodeTab);
4160 }
4161 xmlFree(obj);
4162}
4163
4164#if defined(DEBUG) || defined(DEBUG_STEP)
4165/**
4166 * xmlGenericErrorContextNodeSet:
4167 * @output: a FILE * for the output
4168 * @obj: the xmlNodeSetPtr to display
4169 *
4170 * Quick display of a NodeSet
4171 */
4172void
4173xmlGenericErrorContextNodeSet(FILE *output, xmlNodeSetPtr obj) {
4174 int i;
4175
4176 if (output == NULL) output = xmlGenericErrorContext;
4177 if (obj == NULL) {
4178 fprintf(output, "NodeSet == NULL !\n");
4179 return;
4180 }
4181 if (obj->nodeNr == 0) {
4182 fprintf(output, "NodeSet is empty\n");
4183 return;
4184 }
4185 if (obj->nodeTab == NULL) {
4186 fprintf(output, " nodeTab == NULL !\n");
4187 return;
4188 }
4189 for (i = 0; i < obj->nodeNr; i++) {
4190 if (obj->nodeTab[i] == NULL) {
4191 fprintf(output, " NULL !\n");
4192 return;
4193 }
4194 if ((obj->nodeTab[i]->type == XML_DOCUMENT_NODE) ||
4195 (obj->nodeTab[i]->type == XML_HTML_DOCUMENT_NODE))
4196 fprintf(output, " /");
4197 else if (obj->nodeTab[i]->name == NULL)
4198 fprintf(output, " noname!");
4199 else fprintf(output, " %s", obj->nodeTab[i]->name);
4200 }
4201 fprintf(output, "\n");
4202}
4203#endif
4204
4205/**
4206 * xmlXPathNewNodeSet:
4207 * @val: the NodePtr value
4208 *
4209 * Create a new xmlXPathObjectPtr of type NodeSet and initialize
4210 * it with the single Node @val
4211 *
4212 * Returns the newly created object.
4213 */
4214xmlXPathObjectPtr
4215xmlXPathNewNodeSet(xmlNodePtr val) {
4216 xmlXPathObjectPtr ret;
4217
4218 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
4219 if (ret == NULL) {
4220 xmlXPathErrMemory(NULL, "creating nodeset\n");
4221 return(NULL);
4222 }
4223 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
4224 ret->type = XPATH_NODESET;
4225 ret->boolval = 0;
4226 ret->nodesetval = xmlXPathNodeSetCreate(val);
4227 /* @@ with_ns to check whether namespace nodes should be looked at @@ */
4228#ifdef XP_DEBUG_OBJ_USAGE
4229 xmlXPathDebugObjUsageRequested(NULL, XPATH_NODESET);
4230#endif
4231 return(ret);
4232}
4233
4234/**
4235 * xmlXPathNewValueTree:
4236 * @val: the NodePtr value
4237 *
4238 * Create a new xmlXPathObjectPtr of type Value Tree (XSLT) and initialize
4239 * it with the tree root @val
4240 *
4241 * Returns the newly created object.
4242 */
4243xmlXPathObjectPtr
4244xmlXPathNewValueTree(xmlNodePtr val) {
4245 xmlXPathObjectPtr ret;
4246
4247 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
4248 if (ret == NULL) {
4249 xmlXPathErrMemory(NULL, "creating result value tree\n");
4250 return(NULL);
4251 }
4252 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
4253 ret->type = XPATH_XSLT_TREE;
4254 ret->boolval = 1;
4255 ret->user = (void *) val;
4256 ret->nodesetval = xmlXPathNodeSetCreate(val);
4257#ifdef XP_DEBUG_OBJ_USAGE
4258 xmlXPathDebugObjUsageRequested(NULL, XPATH_XSLT_TREE);
4259#endif
4260 return(ret);
4261}
4262
4263/**
4264 * xmlXPathNewNodeSetList:
4265 * @val: an existing NodeSet
4266 *
4267 * Create a new xmlXPathObjectPtr of type NodeSet and initialize
4268 * it with the Nodeset @val
4269 *
4270 * Returns the newly created object.
4271 */
4272xmlXPathObjectPtr
4273xmlXPathNewNodeSetList(xmlNodeSetPtr val)
4274{
4275 xmlXPathObjectPtr ret;
4276 int i;
4277
4278 if (val == NULL)
4279 ret = NULL;
4280 else if (val->nodeTab == NULL)
4281 ret = xmlXPathNewNodeSet(NULL);
4282 else {
4283 ret = xmlXPathNewNodeSet(val->nodeTab[0]);
4284 for (i = 1; i < val->nodeNr; ++i)
4285 xmlXPathNodeSetAddUnique(ret->nodesetval, val->nodeTab[i]);
4286 }
4287
4288 return (ret);
4289}
4290
4291/**
4292 * xmlXPathWrapNodeSet:
4293 * @val: the NodePtr value
4294 *
4295 * Wrap the Nodeset @val in a new xmlXPathObjectPtr
4296 *
4297 * Returns the newly created object.
4298 */
4299xmlXPathObjectPtr
4300xmlXPathWrapNodeSet(xmlNodeSetPtr val) {
4301 xmlXPathObjectPtr ret;
4302
4303 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
4304 if (ret == NULL) {
4305 xmlXPathErrMemory(NULL, "creating node set object\n");
4306 return(NULL);
4307 }
4308 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
4309 ret->type = XPATH_NODESET;
4310 ret->nodesetval = val;
4311#ifdef XP_DEBUG_OBJ_USAGE
4312 xmlXPathDebugObjUsageRequested(NULL, XPATH_NODESET);
4313#endif
4314 return(ret);
4315}
4316
4317/**
4318 * xmlXPathFreeNodeSetList:
4319 * @obj: an existing NodeSetList object
4320 *
4321 * Free up the xmlXPathObjectPtr @obj but don't deallocate the objects in
4322 * the list contrary to xmlXPathFreeObject().
4323 */
4324void
4325xmlXPathFreeNodeSetList(xmlXPathObjectPtr obj) {
4326 if (obj == NULL) return;
4327#ifdef XP_DEBUG_OBJ_USAGE
4328 xmlXPathDebugObjUsageReleased(NULL, obj->type);
4329#endif
4330 xmlFree(obj);
4331}
4332
4333/**
4334 * xmlXPathDifference:
4335 * @nodes1: a node-set
4336 * @nodes2: a node-set
4337 *
4338 * Implements the EXSLT - Sets difference() function:
4339 * node-set set:difference (node-set, node-set)
4340 *
4341 * Returns the difference between the two node sets, or nodes1 if
4342 * nodes2 is empty
4343 */
4344xmlNodeSetPtr
4345xmlXPathDifference (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4346 xmlNodeSetPtr ret;
4347 int i, l1;
4348 xmlNodePtr cur;
4349
4350 if (xmlXPathNodeSetIsEmpty(nodes2))
4351 return(nodes1);
4352
4353 ret = xmlXPathNodeSetCreate(NULL);
4354 if (xmlXPathNodeSetIsEmpty(nodes1))
4355 return(ret);
4356
4357 l1 = xmlXPathNodeSetGetLength(nodes1);
4358
4359 for (i = 0; i < l1; i++) {
4360 cur = xmlXPathNodeSetItem(nodes1, i);
4361 if (!xmlXPathNodeSetContains(nodes2, cur))
4362 xmlXPathNodeSetAddUnique(ret, cur);
4363 }
4364 return(ret);
4365}
4366
4367/**
4368 * xmlXPathIntersection:
4369 * @nodes1: a node-set
4370 * @nodes2: a node-set
4371 *
4372 * Implements the EXSLT - Sets intersection() function:
4373 * node-set set:intersection (node-set, node-set)
4374 *
4375 * Returns a node set comprising the nodes that are within both the
4376 * node sets passed as arguments
4377 */
4378xmlNodeSetPtr
4379xmlXPathIntersection (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4380 xmlNodeSetPtr ret = xmlXPathNodeSetCreate(NULL);
4381 int i, l1;
4382 xmlNodePtr cur;
4383
4384 if (xmlXPathNodeSetIsEmpty(nodes1))
4385 return(ret);
4386 if (xmlXPathNodeSetIsEmpty(nodes2))
4387 return(ret);
4388
4389 l1 = xmlXPathNodeSetGetLength(nodes1);
4390
4391 for (i = 0; i < l1; i++) {
4392 cur = xmlXPathNodeSetItem(nodes1, i);
4393 if (xmlXPathNodeSetContains(nodes2, cur))
4394 xmlXPathNodeSetAddUnique(ret, cur);
4395 }
4396 return(ret);
4397}
4398
4399/**
4400 * xmlXPathDistinctSorted:
4401 * @nodes: a node-set, sorted by document order
4402 *
4403 * Implements the EXSLT - Sets distinct() function:
4404 * node-set set:distinct (node-set)
4405 *
4406 * Returns a subset of the nodes contained in @nodes, or @nodes if
4407 * it is empty
4408 */
4409xmlNodeSetPtr
4410xmlXPathDistinctSorted (xmlNodeSetPtr nodes) {
4411 xmlNodeSetPtr ret;
4412 xmlHashTablePtr hash;
4413 int i, l;
4414 xmlChar * strval;
4415 xmlNodePtr cur;
4416
4417 if (xmlXPathNodeSetIsEmpty(nodes))
4418 return(nodes);
4419
4420 ret = xmlXPathNodeSetCreate(NULL);
4421 l = xmlXPathNodeSetGetLength(nodes);
4422 hash = xmlHashCreate (l);
4423 for (i = 0; i < l; i++) {
4424 cur = xmlXPathNodeSetItem(nodes, i);
4425 strval = xmlXPathCastNodeToString(cur);
4426 if (xmlHashLookup(hash, strval) == NULL) {
4427 xmlHashAddEntry(hash, strval, strval);
4428 xmlXPathNodeSetAddUnique(ret, cur);
4429 } else {
4430 xmlFree(strval);
4431 }
4432 }
4433 xmlHashFree(hash, (xmlHashDeallocator) xmlFree);
4434 return(ret);
4435}
4436
4437/**
4438 * xmlXPathDistinct:
4439 * @nodes: a node-set
4440 *
4441 * Implements the EXSLT - Sets distinct() function:
4442 * node-set set:distinct (node-set)
4443 * @nodes is sorted by document order, then #exslSetsDistinctSorted
4444 * is called with the sorted node-set
4445 *
4446 * Returns a subset of the nodes contained in @nodes, or @nodes if
4447 * it is empty
4448 */
4449xmlNodeSetPtr
4450xmlXPathDistinct (xmlNodeSetPtr nodes) {
4451 if (xmlXPathNodeSetIsEmpty(nodes))
4452 return(nodes);
4453
4454 xmlXPathNodeSetSort(nodes);
4455 return(xmlXPathDistinctSorted(nodes));
4456}
4457
4458/**
4459 * xmlXPathHasSameNodes:
4460 * @nodes1: a node-set
4461 * @nodes2: a node-set
4462 *
4463 * Implements the EXSLT - Sets has-same-nodes function:
4464 * boolean set:has-same-node(node-set, node-set)
4465 *
4466 * Returns true (1) if @nodes1 shares any node with @nodes2, false (0)
4467 * otherwise
4468 */
4469int
4470xmlXPathHasSameNodes (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4471 int i, l;
4472 xmlNodePtr cur;
4473
4474 if (xmlXPathNodeSetIsEmpty(nodes1) ||
4475 xmlXPathNodeSetIsEmpty(nodes2))
4476 return(0);
4477
4478 l = xmlXPathNodeSetGetLength(nodes1);
4479 for (i = 0; i < l; i++) {
4480 cur = xmlXPathNodeSetItem(nodes1, i);
4481 if (xmlXPathNodeSetContains(nodes2, cur))
4482 return(1);
4483 }
4484 return(0);
4485}
4486
4487/**
4488 * xmlXPathNodeLeadingSorted:
4489 * @nodes: a node-set, sorted by document order
4490 * @node: a node
4491 *
4492 * Implements the EXSLT - Sets leading() function:
4493 * node-set set:leading (node-set, node-set)
4494 *
4495 * Returns the nodes in @nodes that precede @node in document order,
4496 * @nodes if @node is NULL or an empty node-set if @nodes
4497 * doesn't contain @node
4498 */
4499xmlNodeSetPtr
4500xmlXPathNodeLeadingSorted (xmlNodeSetPtr nodes, xmlNodePtr node) {
4501 int i, l;
4502 xmlNodePtr cur;
4503 xmlNodeSetPtr ret;
4504
4505 if (node == NULL)
4506 return(nodes);
4507
4508 ret = xmlXPathNodeSetCreate(NULL);
4509 if (xmlXPathNodeSetIsEmpty(nodes) ||
4510 (!xmlXPathNodeSetContains(nodes, node)))
4511 return(ret);
4512
4513 l = xmlXPathNodeSetGetLength(nodes);
4514 for (i = 0; i < l; i++) {
4515 cur = xmlXPathNodeSetItem(nodes, i);
4516 if (cur == node)
4517 break;
4518 xmlXPathNodeSetAddUnique(ret, cur);
4519 }
4520 return(ret);
4521}
4522
4523/**
4524 * xmlXPathNodeLeading:
4525 * @nodes: a node-set
4526 * @node: a node
4527 *
4528 * Implements the EXSLT - Sets leading() function:
4529 * node-set set:leading (node-set, node-set)
4530 * @nodes is sorted by document order, then #exslSetsNodeLeadingSorted
4531 * is called.
4532 *
4533 * Returns the nodes in @nodes that precede @node in document order,
4534 * @nodes if @node is NULL or an empty node-set if @nodes
4535 * doesn't contain @node
4536 */
4537xmlNodeSetPtr
4538xmlXPathNodeLeading (xmlNodeSetPtr nodes, xmlNodePtr node) {
4539 xmlXPathNodeSetSort(nodes);
4540 return(xmlXPathNodeLeadingSorted(nodes, node));
4541}
4542
4543/**
4544 * xmlXPathLeadingSorted:
4545 * @nodes1: a node-set, sorted by document order
4546 * @nodes2: a node-set, sorted by document order
4547 *
4548 * Implements the EXSLT - Sets leading() function:
4549 * node-set set:leading (node-set, node-set)
4550 *
4551 * Returns the nodes in @nodes1 that precede the first node in @nodes2
4552 * in document order, @nodes1 if @nodes2 is NULL or empty or
4553 * an empty node-set if @nodes1 doesn't contain @nodes2
4554 */
4555xmlNodeSetPtr
4556xmlXPathLeadingSorted (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4557 if (xmlXPathNodeSetIsEmpty(nodes2))
4558 return(nodes1);
4559 return(xmlXPathNodeLeadingSorted(nodes1,
4560 xmlXPathNodeSetItem(nodes2, 1)));
4561}
4562
4563/**
4564 * xmlXPathLeading:
4565 * @nodes1: a node-set
4566 * @nodes2: a node-set
4567 *
4568 * Implements the EXSLT - Sets leading() function:
4569 * node-set set:leading (node-set, node-set)
4570 * @nodes1 and @nodes2 are sorted by document order, then
4571 * #exslSetsLeadingSorted is called.
4572 *
4573 * Returns the nodes in @nodes1 that precede the first node in @nodes2
4574 * in document order, @nodes1 if @nodes2 is NULL or empty or
4575 * an empty node-set if @nodes1 doesn't contain @nodes2
4576 */
4577xmlNodeSetPtr
4578xmlXPathLeading (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4579 if (xmlXPathNodeSetIsEmpty(nodes2))
4580 return(nodes1);
4581 if (xmlXPathNodeSetIsEmpty(nodes1))
4582 return(xmlXPathNodeSetCreate(NULL));
4583 xmlXPathNodeSetSort(nodes1);
4584 xmlXPathNodeSetSort(nodes2);
4585 return(xmlXPathNodeLeadingSorted(nodes1,
4586 xmlXPathNodeSetItem(nodes2, 1)));
4587}
4588
4589/**
4590 * xmlXPathNodeTrailingSorted:
4591 * @nodes: a node-set, sorted by document order
4592 * @node: a node
4593 *
4594 * Implements the EXSLT - Sets trailing() function:
4595 * node-set set:trailing (node-set, node-set)
4596 *
4597 * Returns the nodes in @nodes that follow @node in document order,
4598 * @nodes if @node is NULL or an empty node-set if @nodes
4599 * doesn't contain @node
4600 */
4601xmlNodeSetPtr
4602xmlXPathNodeTrailingSorted (xmlNodeSetPtr nodes, xmlNodePtr node) {
4603 int i, l;
4604 xmlNodePtr cur;
4605 xmlNodeSetPtr ret;
4606
4607 if (node == NULL)
4608 return(nodes);
4609
4610 ret = xmlXPathNodeSetCreate(NULL);
4611 if (xmlXPathNodeSetIsEmpty(nodes) ||
4612 (!xmlXPathNodeSetContains(nodes, node)))
4613 return(ret);
4614
4615 l = xmlXPathNodeSetGetLength(nodes);
4616 for (i = l - 1; i >= 0; i--) {
4617 cur = xmlXPathNodeSetItem(nodes, i);
4618 if (cur == node)
4619 break;
4620 xmlXPathNodeSetAddUnique(ret, cur);
4621 }
4622 xmlXPathNodeSetSort(ret); /* bug 413451 */
4623 return(ret);
4624}
4625
4626/**
4627 * xmlXPathNodeTrailing:
4628 * @nodes: a node-set
4629 * @node: a node
4630 *
4631 * Implements the EXSLT - Sets trailing() function:
4632 * node-set set:trailing (node-set, node-set)
4633 * @nodes is sorted by document order, then #xmlXPathNodeTrailingSorted
4634 * is called.
4635 *
4636 * Returns the nodes in @nodes that follow @node in document order,
4637 * @nodes if @node is NULL or an empty node-set if @nodes
4638 * doesn't contain @node
4639 */
4640xmlNodeSetPtr
4641xmlXPathNodeTrailing (xmlNodeSetPtr nodes, xmlNodePtr node) {
4642 xmlXPathNodeSetSort(nodes);
4643 return(xmlXPathNodeTrailingSorted(nodes, node));
4644}
4645
4646/**
4647 * xmlXPathTrailingSorted:
4648 * @nodes1: a node-set, sorted by document order
4649 * @nodes2: a node-set, sorted by document order
4650 *
4651 * Implements the EXSLT - Sets trailing() function:
4652 * node-set set:trailing (node-set, node-set)
4653 *
4654 * Returns the nodes in @nodes1 that follow the first node in @nodes2
4655 * in document order, @nodes1 if @nodes2 is NULL or empty or
4656 * an empty node-set if @nodes1 doesn't contain @nodes2
4657 */
4658xmlNodeSetPtr
4659xmlXPathTrailingSorted (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4660 if (xmlXPathNodeSetIsEmpty(nodes2))
4661 return(nodes1);
4662 return(xmlXPathNodeTrailingSorted(nodes1,
4663 xmlXPathNodeSetItem(nodes2, 0)));
4664}
4665
4666/**
4667 * xmlXPathTrailing:
4668 * @nodes1: a node-set
4669 * @nodes2: a node-set
4670 *
4671 * Implements the EXSLT - Sets trailing() function:
4672 * node-set set:trailing (node-set, node-set)
4673 * @nodes1 and @nodes2 are sorted by document order, then
4674 * #xmlXPathTrailingSorted is called.
4675 *
4676 * Returns the nodes in @nodes1 that follow the first node in @nodes2
4677 * in document order, @nodes1 if @nodes2 is NULL or empty or
4678 * an empty node-set if @nodes1 doesn't contain @nodes2
4679 */
4680xmlNodeSetPtr
4681xmlXPathTrailing (xmlNodeSetPtr nodes1, xmlNodeSetPtr nodes2) {
4682 if (xmlXPathNodeSetIsEmpty(nodes2))
4683 return(nodes1);
4684 if (xmlXPathNodeSetIsEmpty(nodes1))
4685 return(xmlXPathNodeSetCreate(NULL));
4686 xmlXPathNodeSetSort(nodes1);
4687 xmlXPathNodeSetSort(nodes2);
4688 return(xmlXPathNodeTrailingSorted(nodes1,
4689 xmlXPathNodeSetItem(nodes2, 0)));
4690}
4691
4692/************************************************************************
4693 * *
4694 * Routines to handle extra functions *
4695 * *
4696 ************************************************************************/
4697
4698/**
4699 * xmlXPathRegisterFunc:
4700 * @ctxt: the XPath context
4701 * @name: the function name
4702 * @f: the function implementation or NULL
4703 *
4704 * Register a new function. If @f is NULL it unregisters the function
4705 *
4706 * Returns 0 in case of success, -1 in case of error
4707 */
4708int
4709xmlXPathRegisterFunc(xmlXPathContextPtr ctxt, const xmlChar *name,
4710 xmlXPathFunction f) {
4711 return(xmlXPathRegisterFuncNS(ctxt, name, NULL, f));
4712}
4713
4714/**
4715 * xmlXPathRegisterFuncNS:
4716 * @ctxt: the XPath context
4717 * @name: the function name
4718 * @ns_uri: the function namespace URI
4719 * @f: the function implementation or NULL
4720 *
4721 * Register a new function. If @f is NULL it unregisters the function
4722 *
4723 * Returns 0 in case of success, -1 in case of error
4724 */
4725int
4726xmlXPathRegisterFuncNS(xmlXPathContextPtr ctxt, const xmlChar *name,
4727 const xmlChar *ns_uri, xmlXPathFunction f) {
4728 if (ctxt == NULL)
4729 return(-1);
4730 if (name == NULL)
4731 return(-1);
4732
4733 if (ctxt->funcHash == NULL)
4734 ctxt->funcHash = xmlHashCreate(0);
4735 if (ctxt->funcHash == NULL)
4736 return(-1);
4737 if (f == NULL)
4738 return(xmlHashRemoveEntry2(ctxt->funcHash, name, ns_uri, NULL));
4739 return(xmlHashAddEntry2(ctxt->funcHash, name, ns_uri, XML_CAST_FPTR(f)));
4740}
4741
4742/**
4743 * xmlXPathRegisterFuncLookup:
4744 * @ctxt: the XPath context
4745 * @f: the lookup function
4746 * @funcCtxt: the lookup data
4747 *
4748 * Registers an external mechanism to do function lookup.
4749 */
4750void
4751xmlXPathRegisterFuncLookup (xmlXPathContextPtr ctxt,
4752 xmlXPathFuncLookupFunc f,
4753 void *funcCtxt) {
4754 if (ctxt == NULL)
4755 return;
4756 ctxt->funcLookupFunc = f;
4757 ctxt->funcLookupData = funcCtxt;
4758}
4759
4760/**
4761 * xmlXPathFunctionLookup:
4762 * @ctxt: the XPath context
4763 * @name: the function name
4764 *
4765 * Search in the Function array of the context for the given
4766 * function.
4767 *
4768 * Returns the xmlXPathFunction or NULL if not found
4769 */
4770xmlXPathFunction
4771xmlXPathFunctionLookup(xmlXPathContextPtr ctxt, const xmlChar *name) {
4772 if (ctxt == NULL)
4773 return (NULL);
4774
4775 if (ctxt->funcLookupFunc != NULL) {
4776 xmlXPathFunction ret;
4777 xmlXPathFuncLookupFunc f;
4778
4779 f = ctxt->funcLookupFunc;
4780 ret = f(ctxt->funcLookupData, name, NULL);
4781 if (ret != NULL)
4782 return(ret);
4783 }
4784 return(xmlXPathFunctionLookupNS(ctxt, name, NULL));
4785}
4786
4787/**
4788 * xmlXPathFunctionLookupNS:
4789 * @ctxt: the XPath context
4790 * @name: the function name
4791 * @ns_uri: the function namespace URI
4792 *
4793 * Search in the Function array of the context for the given
4794 * function.
4795 *
4796 * Returns the xmlXPathFunction or NULL if not found
4797 */
4798xmlXPathFunction
4799xmlXPathFunctionLookupNS(xmlXPathContextPtr ctxt, const xmlChar *name,
4800 const xmlChar *ns_uri) {
4801 xmlXPathFunction ret;
4802
4803 if (ctxt == NULL)
4804 return(NULL);
4805 if (name == NULL)
4806 return(NULL);
4807
4808 if (ctxt->funcLookupFunc != NULL) {
4809 xmlXPathFuncLookupFunc f;
4810
4811 f = ctxt->funcLookupFunc;
4812 ret = f(ctxt->funcLookupData, name, ns_uri);
4813 if (ret != NULL)
4814 return(ret);
4815 }
4816
4817 if (ctxt->funcHash == NULL)
4818 return(NULL);
4819
4820 XML_CAST_FPTR(ret) = xmlHashLookup2(ctxt->funcHash, name, ns_uri);
4821 return(ret);
4822}
4823
4824/**
4825 * xmlXPathRegisteredFuncsCleanup:
4826 * @ctxt: the XPath context
4827 *
4828 * Cleanup the XPath context data associated to registered functions
4829 */
4830void
4831xmlXPathRegisteredFuncsCleanup(xmlXPathContextPtr ctxt) {
4832 if (ctxt == NULL)
4833 return;
4834
4835 xmlHashFree(ctxt->funcHash, NULL);
4836 ctxt->funcHash = NULL;
4837}
4838
4839/************************************************************************
4840 * *
4841 * Routines to handle Variables *
4842 * *
4843 ************************************************************************/
4844
4845/**
4846 * xmlXPathRegisterVariable:
4847 * @ctxt: the XPath context
4848 * @name: the variable name
4849 * @value: the variable value or NULL
4850 *
4851 * Register a new variable value. If @value is NULL it unregisters
4852 * the variable
4853 *
4854 * Returns 0 in case of success, -1 in case of error
4855 */
4856int
4857xmlXPathRegisterVariable(xmlXPathContextPtr ctxt, const xmlChar *name,
4858 xmlXPathObjectPtr value) {
4859 return(xmlXPathRegisterVariableNS(ctxt, name, NULL, value));
4860}
4861
4862/**
4863 * xmlXPathRegisterVariableNS:
4864 * @ctxt: the XPath context
4865 * @name: the variable name
4866 * @ns_uri: the variable namespace URI
4867 * @value: the variable value or NULL
4868 *
4869 * Register a new variable value. If @value is NULL it unregisters
4870 * the variable
4871 *
4872 * Returns 0 in case of success, -1 in case of error
4873 */
4874int
4875xmlXPathRegisterVariableNS(xmlXPathContextPtr ctxt, const xmlChar *name,
4876 const xmlChar *ns_uri,
4877 xmlXPathObjectPtr value) {
4878 if (ctxt == NULL)
4879 return(-1);
4880 if (name == NULL)
4881 return(-1);
4882
4883 if (ctxt->varHash == NULL)
4884 ctxt->varHash = xmlHashCreate(0);
4885 if (ctxt->varHash == NULL)
4886 return(-1);
4887 if (value == NULL)
4888 return(xmlHashRemoveEntry2(ctxt->varHash, name, ns_uri,
4889 (xmlHashDeallocator)xmlXPathFreeObject));
4890 return(xmlHashUpdateEntry2(ctxt->varHash, name, ns_uri,
4891 (void *) value,
4892 (xmlHashDeallocator)xmlXPathFreeObject));
4893}
4894
4895/**
4896 * xmlXPathRegisterVariableLookup:
4897 * @ctxt: the XPath context
4898 * @f: the lookup function
4899 * @data: the lookup data
4900 *
4901 * register an external mechanism to do variable lookup
4902 */
4903void
4904xmlXPathRegisterVariableLookup(xmlXPathContextPtr ctxt,
4905 xmlXPathVariableLookupFunc f, void *data) {
4906 if (ctxt == NULL)
4907 return;
4908 ctxt->varLookupFunc = f;
4909 ctxt->varLookupData = data;
4910}
4911
4912/**
4913 * xmlXPathVariableLookup:
4914 * @ctxt: the XPath context
4915 * @name: the variable name
4916 *
4917 * Search in the Variable array of the context for the given
4918 * variable value.
4919 *
4920 * Returns a copy of the value or NULL if not found
4921 */
4922xmlXPathObjectPtr
4923xmlXPathVariableLookup(xmlXPathContextPtr ctxt, const xmlChar *name) {
4924 if (ctxt == NULL)
4925 return(NULL);
4926
4927 if (ctxt->varLookupFunc != NULL) {
4928 xmlXPathObjectPtr ret;
4929
4930 ret = ((xmlXPathVariableLookupFunc)ctxt->varLookupFunc)
4931 (ctxt->varLookupData, name, NULL);
4932 return(ret);
4933 }
4934 return(xmlXPathVariableLookupNS(ctxt, name, NULL));
4935}
4936
4937/**
4938 * xmlXPathVariableLookupNS:
4939 * @ctxt: the XPath context
4940 * @name: the variable name
4941 * @ns_uri: the variable namespace URI
4942 *
4943 * Search in the Variable array of the context for the given
4944 * variable value.
4945 *
4946 * Returns the a copy of the value or NULL if not found
4947 */
4948xmlXPathObjectPtr
4949xmlXPathVariableLookupNS(xmlXPathContextPtr ctxt, const xmlChar *name,
4950 const xmlChar *ns_uri) {
4951 if (ctxt == NULL)
4952 return(NULL);
4953
4954 if (ctxt->varLookupFunc != NULL) {
4955 xmlXPathObjectPtr ret;
4956
4957 ret = ((xmlXPathVariableLookupFunc)ctxt->varLookupFunc)
4958 (ctxt->varLookupData, name, ns_uri);
4959 if (ret != NULL) return(ret);
4960 }
4961
4962 if (ctxt->varHash == NULL)
4963 return(NULL);
4964 if (name == NULL)
4965 return(NULL);
4966
4967 return(xmlXPathCacheObjectCopy(ctxt, (xmlXPathObjectPtr)
4968 xmlHashLookup2(ctxt->varHash, name, ns_uri)));
4969}
4970
4971/**
4972 * xmlXPathRegisteredVariablesCleanup:
4973 * @ctxt: the XPath context
4974 *
4975 * Cleanup the XPath context data associated to registered variables
4976 */
4977void
4978xmlXPathRegisteredVariablesCleanup(xmlXPathContextPtr ctxt) {
4979 if (ctxt == NULL)
4980 return;
4981
4982 xmlHashFree(ctxt->varHash, (xmlHashDeallocator)xmlXPathFreeObject);
4983 ctxt->varHash = NULL;
4984}
4985
4986/**
4987 * xmlXPathRegisterNs:
4988 * @ctxt: the XPath context
4989 * @prefix: the namespace prefix
4990 * @ns_uri: the namespace name
4991 *
4992 * Register a new namespace. If @ns_uri is NULL it unregisters
4993 * the namespace
4994 *
4995 * Returns 0 in case of success, -1 in case of error
4996 */
4997int
4998xmlXPathRegisterNs(xmlXPathContextPtr ctxt, const xmlChar *prefix,
4999 const xmlChar *ns_uri) {
5000 if (ctxt == NULL)
5001 return(-1);
5002 if (prefix == NULL)
5003 return(-1);
5004
5005 if (ctxt->nsHash == NULL)
5006 ctxt->nsHash = xmlHashCreate(10);
5007 if (ctxt->nsHash == NULL)
5008 return(-1);
5009 if (ns_uri == NULL)
5010 return(xmlHashRemoveEntry(ctxt->nsHash, prefix,
5011 (xmlHashDeallocator)xmlFree));
5012 return(xmlHashUpdateEntry(ctxt->nsHash, prefix, (void *) xmlStrdup(ns_uri),
5013 (xmlHashDeallocator)xmlFree));
5014}
5015
5016/**
5017 * xmlXPathNsLookup:
5018 * @ctxt: the XPath context
5019 * @prefix: the namespace prefix value
5020 *
5021 * Search in the namespace declaration array of the context for the given
5022 * namespace name associated to the given prefix
5023 *
5024 * Returns the value or NULL if not found
5025 */
5026const xmlChar *
5027xmlXPathNsLookup(xmlXPathContextPtr ctxt, const xmlChar *prefix) {
5028 if (ctxt == NULL)
5029 return(NULL);
5030 if (prefix == NULL)
5031 return(NULL);
5032
5033#ifdef XML_XML_NAMESPACE
5034 if (xmlStrEqual(prefix, (const xmlChar *) "xml"))
5035 return(XML_XML_NAMESPACE);
5036#endif
5037
5038 if (ctxt->namespaces != NULL) {
5039 int i;
5040
5041 for (i = 0;i < ctxt->nsNr;i++) {
5042 if ((ctxt->namespaces[i] != NULL) &&
5043 (xmlStrEqual(ctxt->namespaces[i]->prefix, prefix)))
5044 return(ctxt->namespaces[i]->href);
5045 }
5046 }
5047
5048 return((const xmlChar *) xmlHashLookup(ctxt->nsHash, prefix));
5049}
5050
5051/**
5052 * xmlXPathRegisteredNsCleanup:
5053 * @ctxt: the XPath context
5054 *
5055 * Cleanup the XPath context data associated to registered variables
5056 */
5057void
5058xmlXPathRegisteredNsCleanup(xmlXPathContextPtr ctxt) {
5059 if (ctxt == NULL)
5060 return;
5061
5062 xmlHashFree(ctxt->nsHash, (xmlHashDeallocator)xmlFree);
5063 ctxt->nsHash = NULL;
5064}
5065
5066/************************************************************************
5067 * *
5068 * Routines to handle Values *
5069 * *
5070 ************************************************************************/
5071
5072/* Allocations are terrible, one needs to optimize all this !!! */
5073
5074/**
5075 * xmlXPathNewFloat:
5076 * @val: the double value
5077 *
5078 * Create a new xmlXPathObjectPtr of type double and of value @val
5079 *
5080 * Returns the newly created object.
5081 */
5082xmlXPathObjectPtr
5083xmlXPathNewFloat(double val) {
5084 xmlXPathObjectPtr ret;
5085
5086 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5087 if (ret == NULL) {
5088 xmlXPathErrMemory(NULL, "creating float object\n");
5089 return(NULL);
5090 }
5091 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5092 ret->type = XPATH_NUMBER;
5093 ret->floatval = val;
5094#ifdef XP_DEBUG_OBJ_USAGE
5095 xmlXPathDebugObjUsageRequested(NULL, XPATH_NUMBER);
5096#endif
5097 return(ret);
5098}
5099
5100/**
5101 * xmlXPathNewBoolean:
5102 * @val: the boolean value
5103 *
5104 * Create a new xmlXPathObjectPtr of type boolean and of value @val
5105 *
5106 * Returns the newly created object.
5107 */
5108xmlXPathObjectPtr
5109xmlXPathNewBoolean(int val) {
5110 xmlXPathObjectPtr ret;
5111
5112 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5113 if (ret == NULL) {
5114 xmlXPathErrMemory(NULL, "creating boolean object\n");
5115 return(NULL);
5116 }
5117 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5118 ret->type = XPATH_BOOLEAN;
5119 ret->boolval = (val != 0);
5120#ifdef XP_DEBUG_OBJ_USAGE
5121 xmlXPathDebugObjUsageRequested(NULL, XPATH_BOOLEAN);
5122#endif
5123 return(ret);
5124}
5125
5126/**
5127 * xmlXPathNewString:
5128 * @val: the xmlChar * value
5129 *
5130 * Create a new xmlXPathObjectPtr of type string and of value @val
5131 *
5132 * Returns the newly created object.
5133 */
5134xmlXPathObjectPtr
5135xmlXPathNewString(const xmlChar *val) {
5136 xmlXPathObjectPtr ret;
5137
5138 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5139 if (ret == NULL) {
5140 xmlXPathErrMemory(NULL, "creating string object\n");
5141 return(NULL);
5142 }
5143 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5144 ret->type = XPATH_STRING;
5145 if (val != NULL)
5146 ret->stringval = xmlStrdup(val);
5147 else
5148 ret->stringval = xmlStrdup((const xmlChar *)"");
5149#ifdef XP_DEBUG_OBJ_USAGE
5150 xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING);
5151#endif
5152 return(ret);
5153}
5154
5155/**
5156 * xmlXPathWrapString:
5157 * @val: the xmlChar * value
5158 *
5159 * Wraps the @val string into an XPath object.
5160 *
5161 * Returns the newly created object.
5162 */
5163xmlXPathObjectPtr
5164xmlXPathWrapString (xmlChar *val) {
5165 xmlXPathObjectPtr ret;
5166
5167 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5168 if (ret == NULL) {
5169 xmlXPathErrMemory(NULL, "creating string object\n");
5170 return(NULL);
5171 }
5172 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5173 ret->type = XPATH_STRING;
5174 ret->stringval = val;
5175#ifdef XP_DEBUG_OBJ_USAGE
5176 xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING);
5177#endif
5178 return(ret);
5179}
5180
5181/**
5182 * xmlXPathNewCString:
5183 * @val: the char * value
5184 *
5185 * Create a new xmlXPathObjectPtr of type string and of value @val
5186 *
5187 * Returns the newly created object.
5188 */
5189xmlXPathObjectPtr
5190xmlXPathNewCString(const char *val) {
5191 xmlXPathObjectPtr ret;
5192
5193 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5194 if (ret == NULL) {
5195 xmlXPathErrMemory(NULL, "creating string object\n");
5196 return(NULL);
5197 }
5198 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5199 ret->type = XPATH_STRING;
5200 ret->stringval = xmlStrdup(BAD_CAST val);
5201#ifdef XP_DEBUG_OBJ_USAGE
5202 xmlXPathDebugObjUsageRequested(NULL, XPATH_STRING);
5203#endif
5204 return(ret);
5205}
5206
5207/**
5208 * xmlXPathWrapCString:
5209 * @val: the char * value
5210 *
5211 * Wraps a string into an XPath object.
5212 *
5213 * Returns the newly created object.
5214 */
5215xmlXPathObjectPtr
5216xmlXPathWrapCString (char * val) {
5217 return(xmlXPathWrapString((xmlChar *)(val)));
5218}
5219
5220/**
5221 * xmlXPathWrapExternal:
5222 * @val: the user data
5223 *
5224 * Wraps the @val data into an XPath object.
5225 *
5226 * Returns the newly created object.
5227 */
5228xmlXPathObjectPtr
5229xmlXPathWrapExternal (void *val) {
5230 xmlXPathObjectPtr ret;
5231
5232 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5233 if (ret == NULL) {
5234 xmlXPathErrMemory(NULL, "creating user object\n");
5235 return(NULL);
5236 }
5237 memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
5238 ret->type = XPATH_USERS;
5239 ret->user = val;
5240#ifdef XP_DEBUG_OBJ_USAGE
5241 xmlXPathDebugObjUsageRequested(NULL, XPATH_USERS);
5242#endif
5243 return(ret);
5244}
5245
5246/**
5247 * xmlXPathObjectCopy:
5248 * @val: the original object
5249 *
5250 * allocate a new copy of a given object
5251 *
5252 * Returns the newly created object.
5253 */
5254xmlXPathObjectPtr
5255xmlXPathObjectCopy(xmlXPathObjectPtr val) {
5256 xmlXPathObjectPtr ret;
5257
5258 if (val == NULL)
5259 return(NULL);
5260
5261 ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
5262 if (ret == NULL) {
5263 xmlXPathErrMemory(NULL, "copying object\n");
5264 return(NULL);
5265 }
5266 memcpy(ret, val , (size_t) sizeof(xmlXPathObject));
5267#ifdef XP_DEBUG_OBJ_USAGE
5268 xmlXPathDebugObjUsageRequested(NULL, val->type);
5269#endif
5270 switch (val->type) {
5271 case XPATH_BOOLEAN:
5272 case XPATH_NUMBER:
5273 case XPATH_POINT:
5274 case XPATH_RANGE:
5275 break;
5276 case XPATH_STRING:
5277 ret->stringval = xmlStrdup(val->stringval);
5278 break;
5279 case XPATH_XSLT_TREE:
5280#if 0
5281/*
5282 Removed 11 July 2004 - the current handling of xslt tmpRVT nodes means that
5283 this previous handling is no longer correct, and can cause some serious
5284 problems (ref. bug 145547)
5285*/
5286 if ((val->nodesetval != NULL) &&
5287 (val->nodesetval->nodeTab != NULL)) {
5288 xmlNodePtr cur, tmp;
5289 xmlDocPtr top;
5290
5291 ret->boolval = 1;
5292 top = xmlNewDoc(NULL);
5293 top->name = (char *)
5294 xmlStrdup(val->nodesetval->nodeTab[0]->name);
5295 ret->user = top;
5296 if (top != NULL) {
5297 top->doc = top;
5298 cur = val->nodesetval->nodeTab[0]->children;
5299 while (cur != NULL) {
5300 tmp = xmlDocCopyNode(cur, top, 1);
5301 xmlAddChild((xmlNodePtr) top, tmp);
5302 cur = cur->next;
5303 }
5304 }
5305
5306 ret->nodesetval = xmlXPathNodeSetCreate((xmlNodePtr) top);
5307 } else
5308 ret->nodesetval = xmlXPathNodeSetCreate(NULL);
5309 /* Deallocate the copied tree value */
5310 break;
5311#endif
5312 case XPATH_NODESET:
5313 ret->nodesetval = xmlXPathNodeSetMerge(NULL, val->nodesetval);
5314 /* Do not deallocate the copied tree value */
5315 ret->boolval = 0;
5316 break;
5317 case XPATH_LOCATIONSET:
5318#ifdef LIBXML_XPTR_ENABLED
5319 {
5320 xmlLocationSetPtr loc = val->user;
5321 ret->user = (void *) xmlXPtrLocationSetMerge(NULL, loc);
5322 break;
5323 }
5324#endif
5325 case XPATH_USERS:
5326 ret->user = val->user;
5327 break;
5328 case XPATH_UNDEFINED:
5329 xmlGenericError(xmlGenericErrorContext,
5330 "xmlXPathObjectCopy: unsupported type %d\n",
5331 val->type);
5332 break;
5333 }
5334 return(ret);
5335}
5336
5337/**
5338 * xmlXPathFreeObject:
5339 * @obj: the object to free
5340 *
5341 * Free up an xmlXPathObjectPtr object.
5342 */
5343void
5344xmlXPathFreeObject(xmlXPathObjectPtr obj) {
5345 if (obj == NULL) return;
5346 if ((obj->type == XPATH_NODESET) || (obj->type == XPATH_XSLT_TREE)) {
5347 if (obj->boolval) {
5348#if 0
5349 if (obj->user != NULL) {
5350 xmlXPathFreeNodeSet(obj->nodesetval);
5351 xmlFreeNodeList((xmlNodePtr) obj->user);
5352 } else
5353#endif
5354 obj->type = XPATH_XSLT_TREE; /* TODO: Just for debugging. */
5355 if (obj->nodesetval != NULL)
5356 xmlXPathFreeValueTree(obj->nodesetval);
5357 } else {
5358 if (obj->nodesetval != NULL)
5359 xmlXPathFreeNodeSet(obj->nodesetval);
5360 }
5361#ifdef LIBXML_XPTR_ENABLED
5362 } else if (obj->type == XPATH_LOCATIONSET) {
5363 if (obj->user != NULL)
5364 xmlXPtrFreeLocationSet(obj->user);
5365#endif
5366 } else if (obj->type == XPATH_STRING) {
5367 if (obj->stringval != NULL)
5368 xmlFree(obj->stringval);
5369 }
5370#ifdef XP_DEBUG_OBJ_USAGE
5371 xmlXPathDebugObjUsageReleased(NULL, obj->type);
5372#endif
5373 xmlFree(obj);
5374}
5375
5376/**
5377 * xmlXPathReleaseObject:
5378 * @obj: the xmlXPathObjectPtr to free or to cache
5379 *
5380 * Depending on the state of the cache this frees the given
5381 * XPath object or stores it in the cache.
5382 */
5383static void
5384xmlXPathReleaseObject(xmlXPathContextPtr ctxt, xmlXPathObjectPtr obj)
5385{
5386#define XP_CACHE_ADD(sl, o) if (sl == NULL) { \
5387 sl = xmlPointerListCreate(10); if (sl == NULL) goto free_obj; } \
5388 if (xmlPointerListAddSize(sl, obj, 0) == -1) goto free_obj;
5389
5390#define XP_CACHE_WANTS(sl, n) ((sl == NULL) || ((sl)->number < n))
5391
5392 if (obj == NULL)
5393 return;
5394 if ((ctxt == NULL) || (ctxt->cache == NULL)) {
5395 xmlXPathFreeObject(obj);
5396 } else {
5397 xmlXPathContextCachePtr cache =
5398 (xmlXPathContextCachePtr) ctxt->cache;
5399
5400 switch (obj->type) {
5401 case XPATH_NODESET:
5402 case XPATH_XSLT_TREE:
5403 if (obj->nodesetval != NULL) {
5404 if (obj->boolval) {
5405 /*
5406 * It looks like the @boolval is used for
5407 * evaluation if this an XSLT Result Tree Fragment.
5408 * TODO: Check if this assumption is correct.
5409 */
5410 obj->type = XPATH_XSLT_TREE; /* just for debugging */
5411 xmlXPathFreeValueTree(obj->nodesetval);
5412 obj->nodesetval = NULL;
5413 } else if ((obj->nodesetval->nodeMax <= 40) &&
5414 (XP_CACHE_WANTS(cache->nodesetObjs,
5415 cache->maxNodeset)))
5416 {
5417 XP_CACHE_ADD(cache->nodesetObjs, obj);
5418 goto obj_cached;
5419 } else {
5420 xmlXPathFreeNodeSet(obj->nodesetval);
5421 obj->nodesetval = NULL;
5422 }
5423 }
5424 break;
5425 case XPATH_STRING:
5426 if (obj->stringval != NULL)
5427 xmlFree(obj->stringval);
5428
5429 if (XP_CACHE_WANTS(cache->stringObjs, cache->maxString)) {
5430 XP_CACHE_ADD(cache->stringObjs, obj);
5431 goto obj_cached;
5432 }
5433 break;
5434 case XPATH_BOOLEAN:
5435 if (XP_CACHE_WANTS(cache->booleanObjs, cache->maxBoolean)) {
5436 XP_CACHE_ADD(cache->booleanObjs, obj);
5437 goto obj_cached;
5438 }
5439 break;
5440 case XPATH_NUMBER:
5441 if (XP_CACHE_WANTS(cache->numberObjs, cache->maxNumber)) {
5442 XP_CACHE_ADD(cache->numberObjs, obj);
5443 goto obj_cached;
5444 }
5445 break;
5446#ifdef LIBXML_XPTR_ENABLED
5447 case XPATH_LOCATIONSET:
5448 if (obj->user != NULL) {
5449 xmlXPtrFreeLocationSet(obj->user);
5450 }
5451 goto free_obj;
5452#endif
5453 default:
5454 goto free_obj;
5455 }
5456
5457 /*
5458 * Fallback to adding to the misc-objects slot.
5459 */
5460 if (XP_CACHE_WANTS(cache->miscObjs, cache->maxMisc)) {
5461 XP_CACHE_ADD(cache->miscObjs, obj);
5462 } else
5463 goto free_obj;
5464
5465obj_cached:
5466
5467#ifdef XP_DEBUG_OBJ_USAGE
5468 xmlXPathDebugObjUsageReleased(ctxt, obj->type);
5469#endif
5470
5471 if (obj->nodesetval != NULL) {
5472 xmlNodeSetPtr tmpset = obj->nodesetval;
5473
5474 /*
5475 * TODO: Due to those nasty ns-nodes, we need to traverse
5476 * the list and free the ns-nodes.
5477 * URGENT TODO: Check if it's actually slowing things down.
5478 * Maybe we shouldn't try to preserve the list.
5479 */
5480 if (tmpset->nodeNr > 1) {
5481 int i;
5482 xmlNodePtr node;
5483
5484 for (i = 0; i < tmpset->nodeNr; i++) {
5485 node = tmpset->nodeTab[i];
5486 if ((node != NULL) &&
5487 (node->type == XML_NAMESPACE_DECL))
5488 {
5489 xmlXPathNodeSetFreeNs((xmlNsPtr) node);
5490 }
5491 }
5492 } else if (tmpset->nodeNr == 1) {
5493 if ((tmpset->nodeTab[0] != NULL) &&
5494 (tmpset->nodeTab[0]->type == XML_NAMESPACE_DECL))
5495 xmlXPathNodeSetFreeNs((xmlNsPtr) tmpset->nodeTab[0]);
5496 }
5497 tmpset->nodeNr = 0;
5498 memset(obj, 0, sizeof(xmlXPathObject));
5499 obj->nodesetval = tmpset;
5500 } else
5501 memset(obj, 0, sizeof(xmlXPathObject));
5502
5503 return;
5504
5505free_obj:
5506 /*
5507 * Cache is full; free the object.
5508 */
5509 if (obj->nodesetval != NULL)
5510 xmlXPathFreeNodeSet(obj->nodesetval);
5511#ifdef XP_DEBUG_OBJ_USAGE
5512 xmlXPathDebugObjUsageReleased(NULL, obj->type);
5513#endif
5514 xmlFree(obj);
5515 }
5516 return;
5517}
5518
5519
5520/************************************************************************
5521 * *
5522 * Type Casting Routines *
5523 * *
5524 ************************************************************************/
5525
5526/**
5527 * xmlXPathCastBooleanToString:
5528 * @val: a boolean
5529 *
5530 * Converts a boolean to its string value.
5531 *
5532 * Returns a newly allocated string.
5533 */
5534xmlChar *
5535xmlXPathCastBooleanToString (int val) {
5536 xmlChar *ret;
5537 if (val)
5538 ret = xmlStrdup((const xmlChar *) "true");
5539 else
5540 ret = xmlStrdup((const xmlChar *) "false");
5541 return(ret);
5542}
5543
5544/**
5545 * xmlXPathCastNumberToString:
5546 * @val: a number
5547 *
5548 * Converts a number to its string value.
5549 *
5550 * Returns a newly allocated string.
5551 */
5552xmlChar *
5553xmlXPathCastNumberToString (double val) {
5554 xmlChar *ret;
5555 switch (xmlXPathIsInf(val)) {
5556 case 1:
5557 ret = xmlStrdup((const xmlChar *) "Infinity");
5558 break;
5559 case -1:
5560 ret = xmlStrdup((const xmlChar *) "-Infinity");
5561 break;
5562 default:
5563 if (xmlXPathIsNaN(val)) {
5564 ret = xmlStrdup((const xmlChar *) "NaN");
5565 } else if (val == 0 && xmlXPathGetSign(val) != 0) {
5566 ret = xmlStrdup((const xmlChar *) "0");
5567 } else {
5568 /* could be improved */
5569 char buf[100];
5570 xmlXPathFormatNumber(val, buf, 99);
5571 buf[99] = 0;
5572 ret = xmlStrdup((const xmlChar *) buf);
5573 }
5574 }
5575 return(ret);
5576}
5577
5578/**
5579 * xmlXPathCastNodeToString:
5580 * @node: a node
5581 *
5582 * Converts a node to its string value.
5583 *
5584 * Returns a newly allocated string.
5585 */
5586xmlChar *
5587xmlXPathCastNodeToString (xmlNodePtr node) {
5588xmlChar *ret;
5589 if ((ret = xmlNodeGetContent(node)) == NULL)
5590 ret = xmlStrdup((const xmlChar *) "");
5591 return(ret);
5592}
5593
5594/**
5595 * xmlXPathCastNodeSetToString:
5596 * @ns: a node-set
5597 *
5598 * Converts a node-set to its string value.
5599 *
5600 * Returns a newly allocated string.
5601 */
5602xmlChar *
5603xmlXPathCastNodeSetToString (xmlNodeSetPtr ns) {
5604 if ((ns == NULL) || (ns->nodeNr == 0) || (ns->nodeTab == NULL))
5605 return(xmlStrdup((const xmlChar *) ""));
5606
5607 if (ns->nodeNr > 1)
5608 xmlXPathNodeSetSort(ns);
5609 return(xmlXPathCastNodeToString(ns->nodeTab[0]));
5610}
5611
5612/**
5613 * xmlXPathCastToString:
5614 * @val: an XPath object
5615 *
5616 * Converts an existing object to its string() equivalent
5617 *
5618 * Returns the allocated string value of the object, NULL in case of error.
5619 * It's up to the caller to free the string memory with xmlFree().
5620 */
5621xmlChar *
5622xmlXPathCastToString(xmlXPathObjectPtr val) {
5623 xmlChar *ret = NULL;
5624
5625 if (val == NULL)
5626 return(xmlStrdup((const xmlChar *) ""));
5627 switch (val->type) {
5628 case XPATH_UNDEFINED:
5629#ifdef DEBUG_EXPR
5630 xmlGenericError(xmlGenericErrorContext, "String: undefined\n");
5631#endif
5632 ret = xmlStrdup((const xmlChar *) "");
5633 break;
5634 case XPATH_NODESET:
5635 case XPATH_XSLT_TREE:
5636 ret = xmlXPathCastNodeSetToString(val->nodesetval);
5637 break;
5638 case XPATH_STRING:
5639 return(xmlStrdup(val->stringval));
5640 case XPATH_BOOLEAN:
5641 ret = xmlXPathCastBooleanToString(val->boolval);
5642 break;
5643 case XPATH_NUMBER: {
5644 ret = xmlXPathCastNumberToString(val->floatval);
5645 break;
5646 }
5647 case XPATH_USERS:
5648 case XPATH_POINT:
5649 case XPATH_RANGE:
5650 case XPATH_LOCATIONSET:
5651 TODO
5652 ret = xmlStrdup((const xmlChar *) "");
5653 break;
5654 }
5655 return(ret);
5656}
5657
5658/**
5659 * xmlXPathConvertString:
5660 * @val: an XPath object
5661 *
5662 * Converts an existing object to its string() equivalent
5663 *
5664 * Returns the new object, the old one is freed (or the operation
5665 * is done directly on @val)
5666 */
5667xmlXPathObjectPtr
5668xmlXPathConvertString(xmlXPathObjectPtr val) {
5669 xmlChar *res = NULL;
5670
5671 if (val == NULL)
5672 return(xmlXPathNewCString(""));
5673
5674 switch (val->type) {
5675 case XPATH_UNDEFINED:
5676#ifdef DEBUG_EXPR
5677 xmlGenericError(xmlGenericErrorContext, "STRING: undefined\n");
5678#endif
5679 break;
5680 case XPATH_NODESET:
5681 case XPATH_XSLT_TREE:
5682 res = xmlXPathCastNodeSetToString(val->nodesetval);
5683 break;
5684 case XPATH_STRING:
5685 return(val);
5686 case XPATH_BOOLEAN:
5687 res = xmlXPathCastBooleanToString(val->boolval);
5688 break;
5689 case XPATH_NUMBER:
5690 res = xmlXPathCastNumberToString(val->floatval);
5691 break;
5692 case XPATH_USERS:
5693 case XPATH_POINT:
5694 case XPATH_RANGE:
5695 case XPATH_LOCATIONSET:
5696 TODO;
5697 break;
5698 }
5699 xmlXPathFreeObject(val);
5700 if (res == NULL)
5701 return(xmlXPathNewCString(""));
5702 return(xmlXPathWrapString(res));
5703}
5704
5705/**
5706 * xmlXPathCastBooleanToNumber:
5707 * @val: a boolean
5708 *
5709 * Converts a boolean to its number value
5710 *
5711 * Returns the number value
5712 */
5713double
5714xmlXPathCastBooleanToNumber(int val) {
5715 if (val)
5716 return(1.0);
5717 return(0.0);
5718}
5719
5720/**
5721 * xmlXPathCastStringToNumber:
5722 * @val: a string
5723 *
5724 * Converts a string to its number value
5725 *
5726 * Returns the number value
5727 */
5728double
5729xmlXPathCastStringToNumber(const xmlChar * val) {
5730 return(xmlXPathStringEvalNumber(val));
5731}
5732
5733/**
5734 * xmlXPathCastNodeToNumber:
5735 * @node: a node
5736 *
5737 * Converts a node to its number value
5738 *
5739 * Returns the number value
5740 */
5741double
5742xmlXPathCastNodeToNumber (xmlNodePtr node) {
5743 xmlChar *strval;
5744 double ret;
5745
5746 if (node == NULL)
5747 return(xmlXPathNAN);
5748 strval = xmlXPathCastNodeToString(node);
5749 if (strval == NULL)
5750 return(xmlXPathNAN);
5751 ret = xmlXPathCastStringToNumber(strval);
5752 xmlFree(strval);
5753
5754 return(ret);
5755}
5756
5757/**
5758 * xmlXPathCastNodeSetToNumber:
5759 * @ns: a node-set
5760 *
5761 * Converts a node-set to its number value
5762 *
5763 * Returns the number value
5764 */
5765double
5766xmlXPathCastNodeSetToNumber (xmlNodeSetPtr ns) {
5767 xmlChar *str;
5768 double ret;
5769
5770 if (ns == NULL)
5771 return(xmlXPathNAN);
5772 str = xmlXPathCastNodeSetToString(ns);
5773 ret = xmlXPathCastStringToNumber(str);
5774 xmlFree(str);
5775 return(ret);
5776}
5777
5778/**
5779 * xmlXPathCastToNumber:
5780 * @val: an XPath object
5781 *
5782 * Converts an XPath object to its number value
5783 *
5784 * Returns the number value
5785 */
5786double
5787xmlXPathCastToNumber(xmlXPathObjectPtr val) {
5788 double ret = 0.0;
5789
5790 if (val == NULL)
5791 return(xmlXPathNAN);
5792 switch (val->type) {
5793 case XPATH_UNDEFINED:
5794#ifdef DEGUB_EXPR
5795 xmlGenericError(xmlGenericErrorContext, "NUMBER: undefined\n");
5796#endif
5797 ret = xmlXPathNAN;
5798 break;
5799 case XPATH_NODESET:
5800 case XPATH_XSLT_TREE:
5801 ret = xmlXPathCastNodeSetToNumber(val->nodesetval);
5802 break;
5803 case XPATH_STRING:
5804 ret = xmlXPathCastStringToNumber(val->stringval);
5805 break;
5806 case XPATH_NUMBER:
5807 ret = val->floatval;
5808 break;
5809 case XPATH_BOOLEAN:
5810 ret = xmlXPathCastBooleanToNumber(val->boolval);
5811 break;
5812 case XPATH_USERS:
5813 case XPATH_POINT:
5814 case XPATH_RANGE:
5815 case XPATH_LOCATIONSET:
5816 TODO;
5817 ret = xmlXPathNAN;
5818 break;
5819 }
5820 return(ret);
5821}
5822
5823/**
5824 * xmlXPathConvertNumber:
5825 * @val: an XPath object
5826 *
5827 * Converts an existing object to its number() equivalent
5828 *
5829 * Returns the new object, the old one is freed (or the operation
5830 * is done directly on @val)
5831 */
5832xmlXPathObjectPtr
5833xmlXPathConvertNumber(xmlXPathObjectPtr val) {
5834 xmlXPathObjectPtr ret;
5835
5836 if (val == NULL)
5837 return(xmlXPathNewFloat(0.0));
5838 if (val->type == XPATH_NUMBER)
5839 return(val);
5840 ret = xmlXPathNewFloat(xmlXPathCastToNumber(val));
5841 xmlXPathFreeObject(val);
5842 return(ret);
5843}
5844
5845/**
5846 * xmlXPathCastNumberToBoolean:
5847 * @val: a number
5848 *
5849 * Converts a number to its boolean value
5850 *
5851 * Returns the boolean value
5852 */
5853int
5854xmlXPathCastNumberToBoolean (double val) {
5855 if (xmlXPathIsNaN(val) || (val == 0.0))
5856 return(0);
5857 return(1);
5858}
5859
5860/**
5861 * xmlXPathCastStringToBoolean:
5862 * @val: a string
5863 *
5864 * Converts a string to its boolean value
5865 *
5866 * Returns the boolean value
5867 */
5868int
5869xmlXPathCastStringToBoolean (const xmlChar *val) {
5870 if ((val == NULL) || (xmlStrlen(val) == 0))
5871 return(0);
5872 return(1);
5873}
5874
5875/**
5876 * xmlXPathCastNodeSetToBoolean:
5877 * @ns: a node-set
5878 *
5879 * Converts a node-set to its boolean value
5880 *
5881 * Returns the boolean value
5882 */
5883int
5884xmlXPathCastNodeSetToBoolean (xmlNodeSetPtr ns) {
5885 if ((ns == NULL) || (ns->nodeNr == 0))
5886 return(0);
5887 return(1);
5888}
5889
5890/**
5891 * xmlXPathCastToBoolean:
5892 * @val: an XPath object
5893 *
5894 * Converts an XPath object to its boolean value
5895 *
5896 * Returns the boolean value
5897 */
5898int
5899xmlXPathCastToBoolean (xmlXPathObjectPtr val) {
5900 int ret = 0;
5901
5902 if (val == NULL)
5903 return(0);
5904 switch (val->type) {
5905 case XPATH_UNDEFINED:
5906#ifdef DEBUG_EXPR
5907 xmlGenericError(xmlGenericErrorContext, "BOOLEAN: undefined\n");
5908#endif
5909 ret = 0;
5910 break;
5911 case XPATH_NODESET:
5912 case XPATH_XSLT_TREE:
5913 ret = xmlXPathCastNodeSetToBoolean(val->nodesetval);
5914 break;
5915 case XPATH_STRING:
5916 ret = xmlXPathCastStringToBoolean(val->stringval);
5917 break;
5918 case XPATH_NUMBER:
5919 ret = xmlXPathCastNumberToBoolean(val->floatval);
5920 break;
5921 case XPATH_BOOLEAN:
5922 ret = val->boolval;
5923 break;
5924 case XPATH_USERS:
5925 case XPATH_POINT:
5926 case XPATH_RANGE:
5927 case XPATH_LOCATIONSET:
5928 TODO;
5929 ret = 0;
5930 break;
5931 }
5932 return(ret);
5933}
5934
5935
5936/**
5937 * xmlXPathConvertBoolean:
5938 * @val: an XPath object
5939 *
5940 * Converts an existing object to its boolean() equivalent
5941 *
5942 * Returns the new object, the old one is freed (or the operation
5943 * is done directly on @val)
5944 */
5945xmlXPathObjectPtr
5946xmlXPathConvertBoolean(xmlXPathObjectPtr val) {
5947 xmlXPathObjectPtr ret;
5948
5949 if (val == NULL)
5950 return(xmlXPathNewBoolean(0));
5951 if (val->type == XPATH_BOOLEAN)
5952 return(val);
5953 ret = xmlXPathNewBoolean(xmlXPathCastToBoolean(val));
5954 xmlXPathFreeObject(val);
5955 return(ret);
5956}
5957
5958/************************************************************************
5959 * *
5960 * Routines to handle XPath contexts *
5961 * *
5962 ************************************************************************/
5963
5964/**
5965 * xmlXPathNewContext:
5966 * @doc: the XML document
5967 *
5968 * Create a new xmlXPathContext
5969 *
5970 * Returns the xmlXPathContext just allocated. The caller will need to free it.
5971 */
5972xmlXPathContextPtr
5973xmlXPathNewContext(xmlDocPtr doc) {
5974 xmlXPathContextPtr ret;
5975
5976 ret = (xmlXPathContextPtr) xmlMalloc(sizeof(xmlXPathContext));
5977 if (ret == NULL) {
5978 xmlXPathErrMemory(NULL, "creating context\n");
5979 return(NULL);
5980 }
5981 memset(ret, 0 , (size_t) sizeof(xmlXPathContext));
5982 ret->doc = doc;
5983 ret->node = NULL;
5984
5985 ret->varHash = NULL;
5986
5987 ret->nb_types = 0;
5988 ret->max_types = 0;
5989 ret->types = NULL;
5990
5991 ret->funcHash = xmlHashCreate(0);
5992
5993 ret->nb_axis = 0;
5994 ret->max_axis = 0;
5995 ret->axis = NULL;
5996
5997 ret->nsHash = NULL;
5998 ret->user = NULL;
5999
6000 ret->contextSize = -1;
6001 ret->proximityPosition = -1;
6002
6003#ifdef XP_DEFAULT_CACHE_ON
6004 if (xmlXPathContextSetCache(ret, 1, -1, 0) == -1) {
6005 xmlXPathFreeContext(ret);
6006 return(NULL);
6007 }
6008#endif
6009
6010 xmlXPathRegisterAllFunctions(ret);
6011
6012 return(ret);
6013}
6014
6015/**
6016 * xmlXPathFreeContext:
6017 * @ctxt: the context to free
6018 *
6019 * Free up an xmlXPathContext
6020 */
6021void
6022xmlXPathFreeContext(xmlXPathContextPtr ctxt) {
6023 if (ctxt == NULL) return;
6024
6025 if (ctxt->cache != NULL)
6026 xmlXPathFreeCache((xmlXPathContextCachePtr) ctxt->cache);
6027 xmlXPathRegisteredNsCleanup(ctxt);
6028 xmlXPathRegisteredFuncsCleanup(ctxt);
6029 xmlXPathRegisteredVariablesCleanup(ctxt);
6030 xmlResetError(&ctxt->lastError);
6031 xmlFree(ctxt);
6032}
6033
6034/************************************************************************
6035 * *
6036 * Routines to handle XPath parser contexts *
6037 * *
6038 ************************************************************************/
6039
6040#define CHECK_CTXT(ctxt) \
6041 if (ctxt == NULL) { \
6042 __xmlRaiseError(NULL, NULL, NULL, \
6043 NULL, NULL, XML_FROM_XPATH, \
6044 XML_ERR_INTERNAL_ERROR, XML_ERR_FATAL, \
6045 __FILE__, __LINE__, \
6046 NULL, NULL, NULL, 0, 0, \
6047 "NULL context pointer\n"); \
6048 return(NULL); \
6049 } \
6050
6051#define CHECK_CTXT_NEG(ctxt) \
6052 if (ctxt == NULL) { \
6053 __xmlRaiseError(NULL, NULL, NULL, \
6054 NULL, NULL, XML_FROM_XPATH, \
6055 XML_ERR_INTERNAL_ERROR, XML_ERR_FATAL, \
6056 __FILE__, __LINE__, \
6057 NULL, NULL, NULL, 0, 0, \
6058 "NULL context pointer\n"); \
6059 return(-1); \
6060 } \
6061
6062
6063#define CHECK_CONTEXT(ctxt) \
6064 if ((ctxt == NULL) || (ctxt->doc == NULL) || \
6065 (ctxt->doc->children == NULL)) { \
6066 xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_INVALID_CTXT); \
6067 return(NULL); \
6068 }
6069
6070
6071/**
6072 * xmlXPathNewParserContext:
6073 * @str: the XPath expression
6074 * @ctxt: the XPath context
6075 *
6076 * Create a new xmlXPathParserContext
6077 *
6078 * Returns the xmlXPathParserContext just allocated.
6079 */
6080xmlXPathParserContextPtr
6081xmlXPathNewParserContext(const xmlChar *str, xmlXPathContextPtr ctxt) {
6082 xmlXPathParserContextPtr ret;
6083
6084 ret = (xmlXPathParserContextPtr) xmlMalloc(sizeof(xmlXPathParserContext));
6085 if (ret == NULL) {
6086 xmlXPathErrMemory(ctxt, "creating parser context\n");
6087 return(NULL);
6088 }
6089 memset(ret, 0 , (size_t) sizeof(xmlXPathParserContext));
6090 ret->cur = ret->base = str;
6091 ret->context = ctxt;
6092
6093 ret->comp = xmlXPathNewCompExpr();
6094 if (ret->comp == NULL) {
6095 xmlFree(ret->valueTab);
6096 xmlFree(ret);
6097 return(NULL);
6098 }
6099 if ((ctxt != NULL) && (ctxt->dict != NULL)) {
6100 ret->comp->dict = ctxt->dict;
6101 xmlDictReference(ret->comp->dict);
6102 }
6103
6104 return(ret);
6105}
6106
6107/**
6108 * xmlXPathCompParserContext:
6109 * @comp: the XPath compiled expression
6110 * @ctxt: the XPath context
6111 *
6112 * Create a new xmlXPathParserContext when processing a compiled expression
6113 *
6114 * Returns the xmlXPathParserContext just allocated.
6115 */
6116static xmlXPathParserContextPtr
6117xmlXPathCompParserContext(xmlXPathCompExprPtr comp, xmlXPathContextPtr ctxt) {
6118 xmlXPathParserContextPtr ret;
6119
6120 ret = (xmlXPathParserContextPtr) xmlMalloc(sizeof(xmlXPathParserContext));
6121 if (ret == NULL) {
6122 xmlXPathErrMemory(ctxt, "creating evaluation context\n");
6123 return(NULL);
6124 }
6125 memset(ret, 0 , (size_t) sizeof(xmlXPathParserContext));
6126
6127 /* Allocate the value stack */
6128 ret->valueTab = (xmlXPathObjectPtr *)
6129 xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
6130 if (ret->valueTab == NULL) {
6131 xmlFree(ret);
6132 xmlXPathErrMemory(ctxt, "creating evaluation context\n");
6133 return(NULL);
6134 }
6135 ret->valueNr = 0;
6136 ret->valueMax = 10;
6137 ret->value = NULL;
6138
6139 ret->context = ctxt;
6140 ret->comp = comp;
6141
6142 return(ret);
6143}
6144
6145/**
6146 * xmlXPathFreeParserContext:
6147 * @ctxt: the context to free
6148 *
6149 * Free up an xmlXPathParserContext
6150 */
6151void
6152xmlXPathFreeParserContext(xmlXPathParserContextPtr ctxt) {
6153 if (ctxt->valueTab != NULL) {
6154 xmlFree(ctxt->valueTab);
6155 }
6156 if (ctxt->comp != NULL) {
6157#ifdef XPATH_STREAMING
6158 if (ctxt->comp->stream != NULL) {
6159 xmlFreePatternList(ctxt->comp->stream);
6160 ctxt->comp->stream = NULL;
6161 }
6162#endif
6163 xmlXPathFreeCompExpr(ctxt->comp);
6164 }
6165 xmlFree(ctxt);
6166}
6167
6168/************************************************************************
6169 * *
6170 * The implicit core function library *
6171 * *
6172 ************************************************************************/
6173
6174/**
6175 * xmlXPathNodeValHash:
6176 * @node: a node pointer
6177 *
6178 * Function computing the beginning of the string value of the node,
6179 * used to speed up comparisons
6180 *
6181 * Returns an int usable as a hash
6182 */
6183static unsigned int
6184xmlXPathNodeValHash(xmlNodePtr node) {
6185 int len = 2;
6186 const xmlChar * string = NULL;
6187 xmlNodePtr tmp = NULL;
6188 unsigned int ret = 0;
6189
6190 if (node == NULL)
6191 return(0);
6192
6193 if (node->type == XML_DOCUMENT_NODE) {
6194 tmp = xmlDocGetRootElement((xmlDocPtr) node);
6195 if (tmp == NULL)
6196 node = node->children;
6197 else
6198 node = tmp;
6199
6200 if (node == NULL)
6201 return(0);
6202 }
6203
6204 switch (node->type) {
6205 case XML_COMMENT_NODE:
6206 case XML_PI_NODE:
6207 case XML_CDATA_SECTION_NODE:
6208 case XML_TEXT_NODE:
6209 string = node->content;
6210 if (string == NULL)
6211 return(0);
6212 if (string[0] == 0)
6213 return(0);
6214 return(((unsigned int) string[0]) +
6215 (((unsigned int) string[1]) << 8));
6216 case XML_NAMESPACE_DECL:
6217 string = ((xmlNsPtr)node)->href;
6218 if (string == NULL)
6219 return(0);
6220 if (string[0] == 0)
6221 return(0);
6222 return(((unsigned int) string[0]) +
6223 (((unsigned int) string[1]) << 8));
6224 case XML_ATTRIBUTE_NODE:
6225 tmp = ((xmlAttrPtr) node)->children;
6226 break;
6227 case XML_ELEMENT_NODE:
6228 tmp = node->children;
6229 break;
6230 default:
6231 return(0);
6232 }
6233 while (tmp != NULL) {
6234 switch (tmp->type) {
6235 case XML_COMMENT_NODE:
6236 case XML_PI_NODE:
6237 case XML_CDATA_SECTION_NODE:
6238 case XML_TEXT_NODE:
6239 string = tmp->content;
6240 break;
6241 case XML_NAMESPACE_DECL:
6242 string = ((xmlNsPtr)tmp)->href;
6243 break;
6244 default:
6245 break;
6246 }
6247 if ((string != NULL) && (string[0] != 0)) {
6248 if (len == 1) {
6249 return(ret + (((unsigned int) string[0]) << 8));
6250 }
6251 if (string[1] == 0) {
6252 len = 1;
6253 ret = (unsigned int) string[0];
6254 } else {
6255 return(((unsigned int) string[0]) +
6256 (((unsigned int) string[1]) << 8));
6257 }
6258 }
6259 /*
6260 * Skip to next node
6261 */
6262 if ((tmp->children != NULL) && (tmp->type != XML_DTD_NODE)) {
6263 if (tmp->children->type != XML_ENTITY_DECL) {
6264 tmp = tmp->children;
6265 continue;
6266 }
6267 }
6268 if (tmp == node)
6269 break;
6270
6271 if (tmp->next != NULL) {
6272 tmp = tmp->next;
6273 continue;
6274 }
6275
6276 do {
6277 tmp = tmp->parent;
6278 if (tmp == NULL)
6279 break;
6280 if (tmp == node) {
6281 tmp = NULL;
6282 break;
6283 }
6284 if (tmp->next != NULL) {
6285 tmp = tmp->next;
6286 break;
6287 }
6288 } while (tmp != NULL);
6289 }
6290 return(ret);
6291}
6292
6293/**
6294 * xmlXPathStringHash:
6295 * @string: a string
6296 *
6297 * Function computing the beginning of the string value of the node,
6298 * used to speed up comparisons
6299 *
6300 * Returns an int usable as a hash
6301 */
6302static unsigned int
6303xmlXPathStringHash(const xmlChar * string) {
6304 if (string == NULL)
6305 return((unsigned int) 0);
6306 if (string[0] == 0)
6307 return(0);
6308 return(((unsigned int) string[0]) +
6309 (((unsigned int) string[1]) << 8));
6310}
6311
6312/**
6313 * xmlXPathCompareNodeSetFloat:
6314 * @ctxt: the XPath Parser context
6315 * @inf: less than (1) or greater than (0)
6316 * @strict: is the comparison strict
6317 * @arg: the node set
6318 * @f: the value
6319 *
6320 * Implement the compare operation between a nodeset and a number
6321 * @ns < @val (1, 1, ...
6322 * @ns <= @val (1, 0, ...
6323 * @ns > @val (0, 1, ...
6324 * @ns >= @val (0, 0, ...
6325 *
6326 * If one object to be compared is a node-set and the other is a number,
6327 * then the comparison will be true if and only if there is a node in the
6328 * node-set such that the result of performing the comparison on the number
6329 * to be compared and on the result of converting the string-value of that
6330 * node to a number using the number function is true.
6331 *
6332 * Returns 0 or 1 depending on the results of the test.
6333 */
6334static int
6335xmlXPathCompareNodeSetFloat(xmlXPathParserContextPtr ctxt, int inf, int strict,
6336 xmlXPathObjectPtr arg, xmlXPathObjectPtr f) {
6337 int i, ret = 0;
6338 xmlNodeSetPtr ns;
6339 xmlChar *str2;
6340
6341 if ((f == NULL) || (arg == NULL) ||
6342 ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) {
6343 xmlXPathReleaseObject(ctxt->context, arg);
6344 xmlXPathReleaseObject(ctxt->context, f);
6345 return(0);
6346 }
6347 ns = arg->nodesetval;
6348 if (ns != NULL) {
6349 for (i = 0;i < ns->nodeNr;i++) {
6350 str2 = xmlXPathCastNodeToString(ns->nodeTab[i]);
6351 if (str2 != NULL) {
6352 valuePush(ctxt,
6353 xmlXPathCacheNewString(ctxt->context, str2));
6354 xmlFree(str2);
6355 xmlXPathNumberFunction(ctxt, 1);
6356 valuePush(ctxt, xmlXPathCacheObjectCopy(ctxt->context, f));
6357 ret = xmlXPathCompareValues(ctxt, inf, strict);
6358 if (ret)
6359 break;
6360 }
6361 }
6362 }
6363 xmlXPathReleaseObject(ctxt->context, arg);
6364 xmlXPathReleaseObject(ctxt->context, f);
6365 return(ret);
6366}
6367
6368/**
6369 * xmlXPathCompareNodeSetString:
6370 * @ctxt: the XPath Parser context
6371 * @inf: less than (1) or greater than (0)
6372 * @strict: is the comparison strict
6373 * @arg: the node set
6374 * @s: the value
6375 *
6376 * Implement the compare operation between a nodeset and a string
6377 * @ns < @val (1, 1, ...
6378 * @ns <= @val (1, 0, ...
6379 * @ns > @val (0, 1, ...
6380 * @ns >= @val (0, 0, ...
6381 *
6382 * If one object to be compared is a node-set and the other is a string,
6383 * then the comparison will be true if and only if there is a node in
6384 * the node-set such that the result of performing the comparison on the
6385 * string-value of the node and the other string is true.
6386 *
6387 * Returns 0 or 1 depending on the results of the test.
6388 */
6389static int
6390xmlXPathCompareNodeSetString(xmlXPathParserContextPtr ctxt, int inf, int strict,
6391 xmlXPathObjectPtr arg, xmlXPathObjectPtr s) {
6392 int i, ret = 0;
6393 xmlNodeSetPtr ns;
6394 xmlChar *str2;
6395
6396 if ((s == NULL) || (arg == NULL) ||
6397 ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE))) {
6398 xmlXPathReleaseObject(ctxt->context, arg);
6399 xmlXPathReleaseObject(ctxt->context, s);
6400 return(0);
6401 }
6402 ns = arg->nodesetval;
6403 if (ns != NULL) {
6404 for (i = 0;i < ns->nodeNr;i++) {
6405 str2 = xmlXPathCastNodeToString(ns->nodeTab[i]);
6406 if (str2 != NULL) {
6407 valuePush(ctxt,
6408 xmlXPathCacheNewString(ctxt->context, str2));
6409 xmlFree(str2);
6410 valuePush(ctxt, xmlXPathCacheObjectCopy(ctxt->context, s));
6411 ret = xmlXPathCompareValues(ctxt, inf, strict);
6412 if (ret)
6413 break;
6414 }
6415 }
6416 }
6417 xmlXPathReleaseObject(ctxt->context, arg);
6418 xmlXPathReleaseObject(ctxt->context, s);
6419 return(ret);
6420}
6421
6422/**
6423 * xmlXPathCompareNodeSets:
6424 * @inf: less than (1) or greater than (0)
6425 * @strict: is the comparison strict
6426 * @arg1: the first node set object
6427 * @arg2: the second node set object
6428 *
6429 * Implement the compare operation on nodesets:
6430 *
6431 * If both objects to be compared are node-sets, then the comparison
6432 * will be true if and only if there is a node in the first node-set
6433 * and a node in the second node-set such that the result of performing
6434 * the comparison on the string-values of the two nodes is true.
6435 * ....
6436 * When neither object to be compared is a node-set and the operator
6437 * is <=, <, >= or >, then the objects are compared by converting both
6438 * objects to numbers and comparing the numbers according to IEEE 754.
6439 * ....
6440 * The number function converts its argument to a number as follows:
6441 * - a string that consists of optional whitespace followed by an
6442 * optional minus sign followed by a Number followed by whitespace
6443 * is converted to the IEEE 754 number that is nearest (according
6444 * to the IEEE 754 round-to-nearest rule) to the mathematical value
6445 * represented by the string; any other string is converted to NaN
6446 *
6447 * Conclusion all nodes need to be converted first to their string value
6448 * and then the comparison must be done when possible
6449 */
6450static int
6451xmlXPathCompareNodeSets(int inf, int strict,
6452 xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2) {
6453 int i, j, init = 0;
6454 double val1;
6455 double *values2;
6456 int ret = 0;
6457 xmlNodeSetPtr ns1;
6458 xmlNodeSetPtr ns2;
6459
6460 if ((arg1 == NULL) ||
6461 ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE))) {
6462 xmlXPathFreeObject(arg2);
6463 return(0);
6464 }
6465 if ((arg2 == NULL) ||
6466 ((arg2->type != XPATH_NODESET) && (arg2->type != XPATH_XSLT_TREE))) {
6467 xmlXPathFreeObject(arg1);
6468 xmlXPathFreeObject(arg2);
6469 return(0);
6470 }
6471
6472 ns1 = arg1->nodesetval;
6473 ns2 = arg2->nodesetval;
6474
6475 if ((ns1 == NULL) || (ns1->nodeNr <= 0)) {
6476 xmlXPathFreeObject(arg1);
6477 xmlXPathFreeObject(arg2);
6478 return(0);
6479 }
6480 if ((ns2 == NULL) || (ns2->nodeNr <= 0)) {
6481 xmlXPathFreeObject(arg1);
6482 xmlXPathFreeObject(arg2);
6483 return(0);
6484 }
6485
6486 values2 = (double *) xmlMalloc(ns2->nodeNr * sizeof(double));
6487 if (values2 == NULL) {
6488 xmlXPathErrMemory(NULL, "comparing nodesets\n");
6489 xmlXPathFreeObject(arg1);
6490 xmlXPathFreeObject(arg2);
6491 return(0);
6492 }
6493 for (i = 0;i < ns1->nodeNr;i++) {
6494 val1 = xmlXPathCastNodeToNumber(ns1->nodeTab[i]);
6495 if (xmlXPathIsNaN(val1))
6496 continue;
6497 for (j = 0;j < ns2->nodeNr;j++) {
6498 if (init == 0) {
6499 values2[j] = xmlXPathCastNodeToNumber(ns2->nodeTab[j]);
6500 }
6501 if (xmlXPathIsNaN(values2[j]))
6502 continue;
6503 if (inf && strict)
6504 ret = (val1 < values2[j]);
6505 else if (inf && !strict)
6506 ret = (val1 <= values2[j]);
6507 else if (!inf && strict)
6508 ret = (val1 > values2[j]);
6509 else if (!inf && !strict)
6510 ret = (val1 >= values2[j]);
6511 if (ret)
6512 break;
6513 }
6514 if (ret)
6515 break;
6516 init = 1;
6517 }
6518 xmlFree(values2);
6519 xmlXPathFreeObject(arg1);
6520 xmlXPathFreeObject(arg2);
6521 return(ret);
6522}
6523
6524/**
6525 * xmlXPathCompareNodeSetValue:
6526 * @ctxt: the XPath Parser context
6527 * @inf: less than (1) or greater than (0)
6528 * @strict: is the comparison strict
6529 * @arg: the node set
6530 * @val: the value
6531 *
6532 * Implement the compare operation between a nodeset and a value
6533 * @ns < @val (1, 1, ...
6534 * @ns <= @val (1, 0, ...
6535 * @ns > @val (0, 1, ...
6536 * @ns >= @val (0, 0, ...
6537 *
6538 * If one object to be compared is a node-set and the other is a boolean,
6539 * then the comparison will be true if and only if the result of performing
6540 * the comparison on the boolean and on the result of converting
6541 * the node-set to a boolean using the boolean function is true.
6542 *
6543 * Returns 0 or 1 depending on the results of the test.
6544 */
6545static int
6546xmlXPathCompareNodeSetValue(xmlXPathParserContextPtr ctxt, int inf, int strict,
6547 xmlXPathObjectPtr arg, xmlXPathObjectPtr val) {
6548 if ((val == NULL) || (arg == NULL) ||
6549 ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE)))
6550 return(0);
6551
6552 switch(val->type) {
6553 case XPATH_NUMBER:
6554 return(xmlXPathCompareNodeSetFloat(ctxt, inf, strict, arg, val));
6555 case XPATH_NODESET:
6556 case XPATH_XSLT_TREE:
6557 return(xmlXPathCompareNodeSets(inf, strict, arg, val));
6558 case XPATH_STRING:
6559 return(xmlXPathCompareNodeSetString(ctxt, inf, strict, arg, val));
6560 case XPATH_BOOLEAN:
6561 valuePush(ctxt, arg);
6562 xmlXPathBooleanFunction(ctxt, 1);
6563 valuePush(ctxt, val);
6564 return(xmlXPathCompareValues(ctxt, inf, strict));
6565 default:
6566 TODO
6567 }
6568 return(0);
6569}
6570
6571/**
6572 * xmlXPathEqualNodeSetString:
6573 * @arg: the nodeset object argument
6574 * @str: the string to compare to.
6575 * @neq: flag to show whether for '=' (0) or '!=' (1)
6576 *
6577 * Implement the equal operation on XPath objects content: @arg1 == @arg2
6578 * If one object to be compared is a node-set and the other is a string,
6579 * then the comparison will be true if and only if there is a node in
6580 * the node-set such that the result of performing the comparison on the
6581 * string-value of the node and the other string is true.
6582 *
6583 * Returns 0 or 1 depending on the results of the test.
6584 */
6585static int
6586xmlXPathEqualNodeSetString(xmlXPathObjectPtr arg, const xmlChar * str, int neq)
6587{
6588 int i;
6589 xmlNodeSetPtr ns;
6590 xmlChar *str2;
6591 unsigned int hash;
6592
6593 if ((str == NULL) || (arg == NULL) ||
6594 ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE)))
6595 return (0);
6596 ns = arg->nodesetval;
6597 /*
6598 * A NULL nodeset compared with a string is always false
6599 * (since there is no node equal, and no node not equal)
6600 */
6601 if ((ns == NULL) || (ns->nodeNr <= 0) )
6602 return (0);
6603 hash = xmlXPathStringHash(str);
6604 for (i = 0; i < ns->nodeNr; i++) {
6605 if (xmlXPathNodeValHash(ns->nodeTab[i]) == hash) {
6606 str2 = xmlNodeGetContent(ns->nodeTab[i]);
6607 if ((str2 != NULL) && (xmlStrEqual(str, str2))) {
6608 xmlFree(str2);
6609 if (neq)
6610 continue;
6611 return (1);
6612 } else if ((str2 == NULL) && (xmlStrEqual(str, BAD_CAST ""))) {
6613 if (neq)
6614 continue;
6615 return (1);
6616 } else if (neq) {
6617 if (str2 != NULL)
6618 xmlFree(str2);
6619 return (1);
6620 }
6621 if (str2 != NULL)
6622 xmlFree(str2);
6623 } else if (neq)
6624 return (1);
6625 }
6626 return (0);
6627}
6628
6629/**
6630 * xmlXPathEqualNodeSetFloat:
6631 * @arg: the nodeset object argument
6632 * @f: the float to compare to
6633 * @neq: flag to show whether to compare '=' (0) or '!=' (1)
6634 *
6635 * Implement the equal operation on XPath objects content: @arg1 == @arg2
6636 * If one object to be compared is a node-set and the other is a number,
6637 * then the comparison will be true if and only if there is a node in
6638 * the node-set such that the result of performing the comparison on the
6639 * number to be compared and on the result of converting the string-value
6640 * of that node to a number using the number function is true.
6641 *
6642 * Returns 0 or 1 depending on the results of the test.
6643 */
6644static int
6645xmlXPathEqualNodeSetFloat(xmlXPathParserContextPtr ctxt,
6646 xmlXPathObjectPtr arg, double f, int neq) {
6647 int i, ret=0;
6648 xmlNodeSetPtr ns;
6649 xmlChar *str2;
6650 xmlXPathObjectPtr val;
6651 double v;
6652
6653 if ((arg == NULL) ||
6654 ((arg->type != XPATH_NODESET) && (arg->type != XPATH_XSLT_TREE)))
6655 return(0);
6656
6657 ns = arg->nodesetval;
6658 if (ns != NULL) {
6659 for (i=0;i<ns->nodeNr;i++) {
6660 str2 = xmlXPathCastNodeToString(ns->nodeTab[i]);
6661 if (str2 != NULL) {
6662 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, str2));
6663 xmlFree(str2);
6664 xmlXPathNumberFunction(ctxt, 1);
6665 val = valuePop(ctxt);
6666 v = val->floatval;
6667 xmlXPathReleaseObject(ctxt->context, val);
6668 if (!xmlXPathIsNaN(v)) {
6669 if ((!neq) && (v==f)) {
6670 ret = 1;
6671 break;
6672 } else if ((neq) && (v!=f)) {
6673 ret = 1;
6674 break;
6675 }
6676 } else { /* NaN is unequal to any value */
6677 if (neq)
6678 ret = 1;
6679 }
6680 }
6681 }
6682 }
6683
6684 return(ret);
6685}
6686
6687
6688/**
6689 * xmlXPathEqualNodeSets:
6690 * @arg1: first nodeset object argument
6691 * @arg2: second nodeset object argument
6692 * @neq: flag to show whether to test '=' (0) or '!=' (1)
6693 *
6694 * Implement the equal / not equal operation on XPath nodesets:
6695 * @arg1 == @arg2 or @arg1 != @arg2
6696 * If both objects to be compared are node-sets, then the comparison
6697 * will be true if and only if there is a node in the first node-set and
6698 * a node in the second node-set such that the result of performing the
6699 * comparison on the string-values of the two nodes is true.
6700 *
6701 * (needless to say, this is a costly operation)
6702 *
6703 * Returns 0 or 1 depending on the results of the test.
6704 */
6705static int
6706xmlXPathEqualNodeSets(xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2, int neq) {
6707 int i, j;
6708 unsigned int *hashs1;
6709 unsigned int *hashs2;
6710 xmlChar **values1;
6711 xmlChar **values2;
6712 int ret = 0;
6713 xmlNodeSetPtr ns1;
6714 xmlNodeSetPtr ns2;
6715
6716 if ((arg1 == NULL) ||
6717 ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE)))
6718 return(0);
6719 if ((arg2 == NULL) ||
6720 ((arg2->type != XPATH_NODESET) && (arg2->type != XPATH_XSLT_TREE)))
6721 return(0);
6722
6723 ns1 = arg1->nodesetval;
6724 ns2 = arg2->nodesetval;
6725
6726 if ((ns1 == NULL) || (ns1->nodeNr <= 0))
6727 return(0);
6728 if ((ns2 == NULL) || (ns2->nodeNr <= 0))
6729 return(0);
6730
6731 /*
6732 * for equal, check if there is a node pertaining to both sets
6733 */
6734 if (neq == 0)
6735 for (i = 0;i < ns1->nodeNr;i++)
6736 for (j = 0;j < ns2->nodeNr;j++)
6737 if (ns1->nodeTab[i] == ns2->nodeTab[j])
6738 return(1);
6739
6740 values1 = (xmlChar **) xmlMalloc(ns1->nodeNr * sizeof(xmlChar *));
6741 if (values1 == NULL) {
6742 xmlXPathErrMemory(NULL, "comparing nodesets\n");
6743 return(0);
6744 }
6745 hashs1 = (unsigned int *) xmlMalloc(ns1->nodeNr * sizeof(unsigned int));
6746 if (hashs1 == NULL) {
6747 xmlXPathErrMemory(NULL, "comparing nodesets\n");
6748 xmlFree(values1);
6749 return(0);
6750 }
6751 memset(values1, 0, ns1->nodeNr * sizeof(xmlChar *));
6752 values2 = (xmlChar **) xmlMalloc(ns2->nodeNr * sizeof(xmlChar *));
6753 if (values2 == NULL) {
6754 xmlXPathErrMemory(NULL, "comparing nodesets\n");
6755 xmlFree(hashs1);
6756 xmlFree(values1);
6757 return(0);
6758 }
6759 hashs2 = (unsigned int *) xmlMalloc(ns2->nodeNr * sizeof(unsigned int));
6760 if (hashs2 == NULL) {
6761 xmlXPathErrMemory(NULL, "comparing nodesets\n");
6762 xmlFree(hashs1);
6763 xmlFree(values1);
6764 xmlFree(values2);
6765 return(0);
6766 }
6767 memset(values2, 0, ns2->nodeNr * sizeof(xmlChar *));
6768 for (i = 0;i < ns1->nodeNr;i++) {
6769 hashs1[i] = xmlXPathNodeValHash(ns1->nodeTab[i]);
6770 for (j = 0;j < ns2->nodeNr;j++) {
6771 if (i == 0)
6772 hashs2[j] = xmlXPathNodeValHash(ns2->nodeTab[j]);
6773 if (hashs1[i] != hashs2[j]) {
6774 if (neq) {
6775 ret = 1;
6776 break;
6777 }
6778 }
6779 else {
6780 if (values1[i] == NULL)
6781 values1[i] = xmlNodeGetContent(ns1->nodeTab[i]);
6782 if (values2[j] == NULL)
6783 values2[j] = xmlNodeGetContent(ns2->nodeTab[j]);
6784 ret = xmlStrEqual(values1[i], values2[j]) ^ neq;
6785 if (ret)
6786 break;
6787 }
6788 }
6789 if (ret)
6790 break;
6791 }
6792 for (i = 0;i < ns1->nodeNr;i++)
6793 if (values1[i] != NULL)
6794 xmlFree(values1[i]);
6795 for (j = 0;j < ns2->nodeNr;j++)
6796 if (values2[j] != NULL)
6797 xmlFree(values2[j]);
6798 xmlFree(values1);
6799 xmlFree(values2);
6800 xmlFree(hashs1);
6801 xmlFree(hashs2);
6802 return(ret);
6803}
6804
6805static int
6806xmlXPathEqualValuesCommon(xmlXPathParserContextPtr ctxt,
6807 xmlXPathObjectPtr arg1, xmlXPathObjectPtr arg2) {
6808 int ret = 0;
6809 /*
6810 *At this point we are assured neither arg1 nor arg2
6811 *is a nodeset, so we can just pick the appropriate routine.
6812 */
6813 switch (arg1->type) {
6814 case XPATH_UNDEFINED:
6815#ifdef DEBUG_EXPR
6816 xmlGenericError(xmlGenericErrorContext,
6817 "Equal: undefined\n");
6818#endif
6819 break;
6820 case XPATH_BOOLEAN:
6821 switch (arg2->type) {
6822 case XPATH_UNDEFINED:
6823#ifdef DEBUG_EXPR
6824 xmlGenericError(xmlGenericErrorContext,
6825 "Equal: undefined\n");
6826#endif
6827 break;
6828 case XPATH_BOOLEAN:
6829#ifdef DEBUG_EXPR
6830 xmlGenericError(xmlGenericErrorContext,
6831 "Equal: %d boolean %d \n",
6832 arg1->boolval, arg2->boolval);
6833#endif
6834 ret = (arg1->boolval == arg2->boolval);
6835 break;
6836 case XPATH_NUMBER:
6837 ret = (arg1->boolval ==
6838 xmlXPathCastNumberToBoolean(arg2->floatval));
6839 break;
6840 case XPATH_STRING:
6841 if ((arg2->stringval == NULL) ||
6842 (arg2->stringval[0] == 0)) ret = 0;
6843 else
6844 ret = 1;
6845 ret = (arg1->boolval == ret);
6846 break;
6847 case XPATH_USERS:
6848 case XPATH_POINT:
6849 case XPATH_RANGE:
6850 case XPATH_LOCATIONSET:
6851 TODO
6852 break;
6853 case XPATH_NODESET:
6854 case XPATH_XSLT_TREE:
6855 break;
6856 }
6857 break;
6858 case XPATH_NUMBER:
6859 switch (arg2->type) {
6860 case XPATH_UNDEFINED:
6861#ifdef DEBUG_EXPR
6862 xmlGenericError(xmlGenericErrorContext,
6863 "Equal: undefined\n");
6864#endif
6865 break;
6866 case XPATH_BOOLEAN:
6867 ret = (arg2->boolval==
6868 xmlXPathCastNumberToBoolean(arg1->floatval));
6869 break;
6870 case XPATH_STRING:
6871 valuePush(ctxt, arg2);
6872 xmlXPathNumberFunction(ctxt, 1);
6873 arg2 = valuePop(ctxt);
6874 /* no break on purpose */
6875 case XPATH_NUMBER:
6876 /* Hand check NaN and Infinity equalities */
6877 if (xmlXPathIsNaN(arg1->floatval) ||
6878 xmlXPathIsNaN(arg2->floatval)) {
6879 ret = 0;
6880 } else if (xmlXPathIsInf(arg1->floatval) == 1) {
6881 if (xmlXPathIsInf(arg2->floatval) == 1)
6882 ret = 1;
6883 else
6884 ret = 0;
6885 } else if (xmlXPathIsInf(arg1->floatval) == -1) {
6886 if (xmlXPathIsInf(arg2->floatval) == -1)
6887 ret = 1;
6888 else
6889 ret = 0;
6890 } else if (xmlXPathIsInf(arg2->floatval) == 1) {
6891 if (xmlXPathIsInf(arg1->floatval) == 1)
6892 ret = 1;
6893 else
6894 ret = 0;
6895 } else if (xmlXPathIsInf(arg2->floatval) == -1) {
6896 if (xmlXPathIsInf(arg1->floatval) == -1)
6897 ret = 1;
6898 else
6899 ret = 0;
6900 } else {
6901 ret = (arg1->floatval == arg2->floatval);
6902 }
6903 break;
6904 case XPATH_USERS:
6905 case XPATH_POINT:
6906 case XPATH_RANGE:
6907 case XPATH_LOCATIONSET:
6908 TODO
6909 break;
6910 case XPATH_NODESET:
6911 case XPATH_XSLT_TREE:
6912 break;
6913 }
6914 break;
6915 case XPATH_STRING:
6916 switch (arg2->type) {
6917 case XPATH_UNDEFINED:
6918#ifdef DEBUG_EXPR
6919 xmlGenericError(xmlGenericErrorContext,
6920 "Equal: undefined\n");
6921#endif
6922 break;
6923 case XPATH_BOOLEAN:
6924 if ((arg1->stringval == NULL) ||
6925 (arg1->stringval[0] == 0)) ret = 0;
6926 else
6927 ret = 1;
6928 ret = (arg2->boolval == ret);
6929 break;
6930 case XPATH_STRING:
6931 ret = xmlStrEqual(arg1->stringval, arg2->stringval);
6932 break;
6933 case XPATH_NUMBER:
6934 valuePush(ctxt, arg1);
6935 xmlXPathNumberFunction(ctxt, 1);
6936 arg1 = valuePop(ctxt);
6937 /* Hand check NaN and Infinity equalities */
6938 if (xmlXPathIsNaN(arg1->floatval) ||
6939 xmlXPathIsNaN(arg2->floatval)) {
6940 ret = 0;
6941 } else if (xmlXPathIsInf(arg1->floatval) == 1) {
6942 if (xmlXPathIsInf(arg2->floatval) == 1)
6943 ret = 1;
6944 else
6945 ret = 0;
6946 } else if (xmlXPathIsInf(arg1->floatval) == -1) {
6947 if (xmlXPathIsInf(arg2->floatval) == -1)
6948 ret = 1;
6949 else
6950 ret = 0;
6951 } else if (xmlXPathIsInf(arg2->floatval) == 1) {
6952 if (xmlXPathIsInf(arg1->floatval) == 1)
6953 ret = 1;
6954 else
6955 ret = 0;
6956 } else if (xmlXPathIsInf(arg2->floatval) == -1) {
6957 if (xmlXPathIsInf(arg1->floatval) == -1)
6958 ret = 1;
6959 else
6960 ret = 0;
6961 } else {
6962 ret = (arg1->floatval == arg2->floatval);
6963 }
6964 break;
6965 case XPATH_USERS:
6966 case XPATH_POINT:
6967 case XPATH_RANGE:
6968 case XPATH_LOCATIONSET:
6969 TODO
6970 break;
6971 case XPATH_NODESET:
6972 case XPATH_XSLT_TREE:
6973 break;
6974 }
6975 break;
6976 case XPATH_USERS:
6977 case XPATH_POINT:
6978 case XPATH_RANGE:
6979 case XPATH_LOCATIONSET:
6980 TODO
6981 break;
6982 case XPATH_NODESET:
6983 case XPATH_XSLT_TREE:
6984 break;
6985 }
6986 xmlXPathReleaseObject(ctxt->context, arg1);
6987 xmlXPathReleaseObject(ctxt->context, arg2);
6988 return(ret);
6989}
6990
6991/**
6992 * xmlXPathEqualValues:
6993 * @ctxt: the XPath Parser context
6994 *
6995 * Implement the equal operation on XPath objects content: @arg1 == @arg2
6996 *
6997 * Returns 0 or 1 depending on the results of the test.
6998 */
6999int
7000xmlXPathEqualValues(xmlXPathParserContextPtr ctxt) {
7001 xmlXPathObjectPtr arg1, arg2, argtmp;
7002 int ret = 0;
7003
7004 if ((ctxt == NULL) || (ctxt->context == NULL)) return(0);
7005 arg2 = valuePop(ctxt);
7006 arg1 = valuePop(ctxt);
7007 if ((arg1 == NULL) || (arg2 == NULL)) {
7008 if (arg1 != NULL)
7009 xmlXPathReleaseObject(ctxt->context, arg1);
7010 else
7011 xmlXPathReleaseObject(ctxt->context, arg2);
7012 XP_ERROR0(XPATH_INVALID_OPERAND);
7013 }
7014
7015 if (arg1 == arg2) {
7016#ifdef DEBUG_EXPR
7017 xmlGenericError(xmlGenericErrorContext,
7018 "Equal: by pointer\n");
7019#endif
7020 xmlXPathFreeObject(arg1);
7021 return(1);
7022 }
7023
7024 /*
7025 *If either argument is a nodeset, it's a 'special case'
7026 */
7027 if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) ||
7028 (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) {
7029 /*
7030 *Hack it to assure arg1 is the nodeset
7031 */
7032 if ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE)) {
7033 argtmp = arg2;
7034 arg2 = arg1;
7035 arg1 = argtmp;
7036 }
7037 switch (arg2->type) {
7038 case XPATH_UNDEFINED:
7039#ifdef DEBUG_EXPR
7040 xmlGenericError(xmlGenericErrorContext,
7041 "Equal: undefined\n");
7042#endif
7043 break;
7044 case XPATH_NODESET:
7045 case XPATH_XSLT_TREE:
7046 ret = xmlXPathEqualNodeSets(arg1, arg2, 0);
7047 break;
7048 case XPATH_BOOLEAN:
7049 if ((arg1->nodesetval == NULL) ||
7050 (arg1->nodesetval->nodeNr == 0)) ret = 0;
7051 else
7052 ret = 1;
7053 ret = (ret == arg2->boolval);
7054 break;
7055 case XPATH_NUMBER:
7056 ret = xmlXPathEqualNodeSetFloat(ctxt, arg1, arg2->floatval, 0);
7057 break;
7058 case XPATH_STRING:
7059 ret = xmlXPathEqualNodeSetString(arg1, arg2->stringval, 0);
7060 break;
7061 case XPATH_USERS:
7062 case XPATH_POINT:
7063 case XPATH_RANGE:
7064 case XPATH_LOCATIONSET:
7065 TODO
7066 break;
7067 }
7068 xmlXPathReleaseObject(ctxt->context, arg1);
7069 xmlXPathReleaseObject(ctxt->context, arg2);
7070 return(ret);
7071 }
7072
7073 return (xmlXPathEqualValuesCommon(ctxt, arg1, arg2));
7074}
7075
7076/**
7077 * xmlXPathNotEqualValues:
7078 * @ctxt: the XPath Parser context
7079 *
7080 * Implement the equal operation on XPath objects content: @arg1 == @arg2
7081 *
7082 * Returns 0 or 1 depending on the results of the test.
7083 */
7084int
7085xmlXPathNotEqualValues(xmlXPathParserContextPtr ctxt) {
7086 xmlXPathObjectPtr arg1, arg2, argtmp;
7087 int ret = 0;
7088
7089 if ((ctxt == NULL) || (ctxt->context == NULL)) return(0);
7090 arg2 = valuePop(ctxt);
7091 arg1 = valuePop(ctxt);
7092 if ((arg1 == NULL) || (arg2 == NULL)) {
7093 if (arg1 != NULL)
7094 xmlXPathReleaseObject(ctxt->context, arg1);
7095 else
7096 xmlXPathReleaseObject(ctxt->context, arg2);
7097 XP_ERROR0(XPATH_INVALID_OPERAND);
7098 }
7099
7100 if (arg1 == arg2) {
7101#ifdef DEBUG_EXPR
7102 xmlGenericError(xmlGenericErrorContext,
7103 "NotEqual: by pointer\n");
7104#endif
7105 xmlXPathReleaseObject(ctxt->context, arg1);
7106 return(0);
7107 }
7108
7109 /*
7110 *If either argument is a nodeset, it's a 'special case'
7111 */
7112 if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) ||
7113 (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) {
7114 /*
7115 *Hack it to assure arg1 is the nodeset
7116 */
7117 if ((arg1->type != XPATH_NODESET) && (arg1->type != XPATH_XSLT_TREE)) {
7118 argtmp = arg2;
7119 arg2 = arg1;
7120 arg1 = argtmp;
7121 }
7122 switch (arg2->type) {
7123 case XPATH_UNDEFINED:
7124#ifdef DEBUG_EXPR
7125 xmlGenericError(xmlGenericErrorContext,
7126 "NotEqual: undefined\n");
7127#endif
7128 break;
7129 case XPATH_NODESET:
7130 case XPATH_XSLT_TREE:
7131 ret = xmlXPathEqualNodeSets(arg1, arg2, 1);
7132 break;
7133 case XPATH_BOOLEAN:
7134 if ((arg1->nodesetval == NULL) ||
7135 (arg1->nodesetval->nodeNr == 0)) ret = 0;
7136 else
7137 ret = 1;
7138 ret = (ret != arg2->boolval);
7139 break;
7140 case XPATH_NUMBER:
7141 ret = xmlXPathEqualNodeSetFloat(ctxt, arg1, arg2->floatval, 1);
7142 break;
7143 case XPATH_STRING:
7144 ret = xmlXPathEqualNodeSetString(arg1, arg2->stringval,1);
7145 break;
7146 case XPATH_USERS:
7147 case XPATH_POINT:
7148 case XPATH_RANGE:
7149 case XPATH_LOCATIONSET:
7150 TODO
7151 break;
7152 }
7153 xmlXPathReleaseObject(ctxt->context, arg1);
7154 xmlXPathReleaseObject(ctxt->context, arg2);
7155 return(ret);
7156 }
7157
7158 return (!xmlXPathEqualValuesCommon(ctxt, arg1, arg2));
7159}
7160
7161/**
7162 * xmlXPathCompareValues:
7163 * @ctxt: the XPath Parser context
7164 * @inf: less than (1) or greater than (0)
7165 * @strict: is the comparison strict
7166 *
7167 * Implement the compare operation on XPath objects:
7168 * @arg1 < @arg2 (1, 1, ...
7169 * @arg1 <= @arg2 (1, 0, ...
7170 * @arg1 > @arg2 (0, 1, ...
7171 * @arg1 >= @arg2 (0, 0, ...
7172 *
7173 * When neither object to be compared is a node-set and the operator is
7174 * <=, <, >=, >, then the objects are compared by converted both objects
7175 * to numbers and comparing the numbers according to IEEE 754. The <
7176 * comparison will be true if and only if the first number is less than the
7177 * second number. The <= comparison will be true if and only if the first
7178 * number is less than or equal to the second number. The > comparison
7179 * will be true if and only if the first number is greater than the second
7180 * number. The >= comparison will be true if and only if the first number
7181 * is greater than or equal to the second number.
7182 *
7183 * Returns 1 if the comparison succeeded, 0 if it failed
7184 */
7185int
7186xmlXPathCompareValues(xmlXPathParserContextPtr ctxt, int inf, int strict) {
7187 int ret = 0, arg1i = 0, arg2i = 0;
7188 xmlXPathObjectPtr arg1, arg2;
7189
7190 if ((ctxt == NULL) || (ctxt->context == NULL)) return(0);
7191 arg2 = valuePop(ctxt);
7192 arg1 = valuePop(ctxt);
7193 if ((arg1 == NULL) || (arg2 == NULL)) {
7194 if (arg1 != NULL)
7195 xmlXPathReleaseObject(ctxt->context, arg1);
7196 else
7197 xmlXPathReleaseObject(ctxt->context, arg2);
7198 XP_ERROR0(XPATH_INVALID_OPERAND);
7199 }
7200
7201 if ((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE) ||
7202 (arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) {
7203 /*
7204 * If either argument is a XPATH_NODESET or XPATH_XSLT_TREE the two arguments
7205 * are not freed from within this routine; they will be freed from the
7206 * called routine, e.g. xmlXPathCompareNodeSets or xmlXPathCompareNodeSetValue
7207 */
7208 if (((arg2->type == XPATH_NODESET) || (arg2->type == XPATH_XSLT_TREE)) &&
7209 ((arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE))){
7210 ret = xmlXPathCompareNodeSets(inf, strict, arg1, arg2);
7211 } else {
7212 if ((arg1->type == XPATH_NODESET) || (arg1->type == XPATH_XSLT_TREE)) {
7213 ret = xmlXPathCompareNodeSetValue(ctxt, inf, strict,
7214 arg1, arg2);
7215 } else {
7216 ret = xmlXPathCompareNodeSetValue(ctxt, !inf, strict,
7217 arg2, arg1);
7218 }
7219 }
7220 return(ret);
7221 }
7222
7223 if (arg1->type != XPATH_NUMBER) {
7224 valuePush(ctxt, arg1);
7225 xmlXPathNumberFunction(ctxt, 1);
7226 arg1 = valuePop(ctxt);
7227 }
7228 if (arg1->type != XPATH_NUMBER) {
7229 xmlXPathFreeObject(arg1);
7230 xmlXPathFreeObject(arg2);
7231 XP_ERROR0(XPATH_INVALID_OPERAND);
7232 }
7233 if (arg2->type != XPATH_NUMBER) {
7234 valuePush(ctxt, arg2);
7235 xmlXPathNumberFunction(ctxt, 1);
7236 arg2 = valuePop(ctxt);
7237 }
7238 if (arg2->type != XPATH_NUMBER) {
7239 xmlXPathReleaseObject(ctxt->context, arg1);
7240 xmlXPathReleaseObject(ctxt->context, arg2);
7241 XP_ERROR0(XPATH_INVALID_OPERAND);
7242 }
7243 /*
7244 * Add tests for infinity and nan
7245 * => feedback on 3.4 for Inf and NaN
7246 */
7247 /* Hand check NaN and Infinity comparisons */
7248 if (xmlXPathIsNaN(arg1->floatval) || xmlXPathIsNaN(arg2->floatval)) {
7249 ret=0;
7250 } else {
7251 arg1i=xmlXPathIsInf(arg1->floatval);
7252 arg2i=xmlXPathIsInf(arg2->floatval);
7253 if (inf && strict) {
7254 if ((arg1i == -1 && arg2i != -1) ||
7255 (arg2i == 1 && arg1i != 1)) {
7256 ret = 1;
7257 } else if (arg1i == 0 && arg2i == 0) {
7258 ret = (arg1->floatval < arg2->floatval);
7259 } else {
7260 ret = 0;
7261 }
7262 }
7263 else if (inf && !strict) {
7264 if (arg1i == -1 || arg2i == 1) {
7265 ret = 1;
7266 } else if (arg1i == 0 && arg2i == 0) {
7267 ret = (arg1->floatval <= arg2->floatval);
7268 } else {
7269 ret = 0;
7270 }
7271 }
7272 else if (!inf && strict) {
7273 if ((arg1i == 1 && arg2i != 1) ||
7274 (arg2i == -1 && arg1i != -1)) {
7275 ret = 1;
7276 } else if (arg1i == 0 && arg2i == 0) {
7277 ret = (arg1->floatval > arg2->floatval);
7278 } else {
7279 ret = 0;
7280 }
7281 }
7282 else if (!inf && !strict) {
7283 if (arg1i == 1 || arg2i == -1) {
7284 ret = 1;
7285 } else if (arg1i == 0 && arg2i == 0) {
7286 ret = (arg1->floatval >= arg2->floatval);
7287 } else {
7288 ret = 0;
7289 }
7290 }
7291 }
7292 xmlXPathReleaseObject(ctxt->context, arg1);
7293 xmlXPathReleaseObject(ctxt->context, arg2);
7294 return(ret);
7295}
7296
7297/**
7298 * xmlXPathValueFlipSign:
7299 * @ctxt: the XPath Parser context
7300 *
7301 * Implement the unary - operation on an XPath object
7302 * The numeric operators convert their operands to numbers as if
7303 * by calling the number function.
7304 */
7305void
7306xmlXPathValueFlipSign(xmlXPathParserContextPtr ctxt) {
7307 if ((ctxt == NULL) || (ctxt->context == NULL)) return;
7308 CAST_TO_NUMBER;
7309 CHECK_TYPE(XPATH_NUMBER);
7310 if (xmlXPathIsNaN(ctxt->value->floatval))
7311 ctxt->value->floatval=xmlXPathNAN;
7312 else if (xmlXPathIsInf(ctxt->value->floatval) == 1)
7313 ctxt->value->floatval=xmlXPathNINF;
7314 else if (xmlXPathIsInf(ctxt->value->floatval) == -1)
7315 ctxt->value->floatval=xmlXPathPINF;
7316 else if (ctxt->value->floatval == 0) {
7317 if (xmlXPathGetSign(ctxt->value->floatval) == 0)
7318 ctxt->value->floatval = xmlXPathNZERO;
7319 else
7320 ctxt->value->floatval = 0;
7321 }
7322 else
7323 ctxt->value->floatval = - ctxt->value->floatval;
7324}
7325
7326/**
7327 * xmlXPathAddValues:
7328 * @ctxt: the XPath Parser context
7329 *
7330 * Implement the add operation on XPath objects:
7331 * The numeric operators convert their operands to numbers as if
7332 * by calling the number function.
7333 */
7334void
7335xmlXPathAddValues(xmlXPathParserContextPtr ctxt) {
7336 xmlXPathObjectPtr arg;
7337 double val;
7338
7339 arg = valuePop(ctxt);
7340 if (arg == NULL)
7341 XP_ERROR(XPATH_INVALID_OPERAND);
7342 val = xmlXPathCastToNumber(arg);
7343 xmlXPathReleaseObject(ctxt->context, arg);
7344 CAST_TO_NUMBER;
7345 CHECK_TYPE(XPATH_NUMBER);
7346 ctxt->value->floatval += val;
7347}
7348
7349/**
7350 * xmlXPathSubValues:
7351 * @ctxt: the XPath Parser context
7352 *
7353 * Implement the subtraction operation on XPath objects:
7354 * The numeric operators convert their operands to numbers as if
7355 * by calling the number function.
7356 */
7357void
7358xmlXPathSubValues(xmlXPathParserContextPtr ctxt) {
7359 xmlXPathObjectPtr arg;
7360 double val;
7361
7362 arg = valuePop(ctxt);
7363 if (arg == NULL)
7364 XP_ERROR(XPATH_INVALID_OPERAND);
7365 val = xmlXPathCastToNumber(arg);
7366 xmlXPathReleaseObject(ctxt->context, arg);
7367 CAST_TO_NUMBER;
7368 CHECK_TYPE(XPATH_NUMBER);
7369 ctxt->value->floatval -= val;
7370}
7371
7372/**
7373 * xmlXPathMultValues:
7374 * @ctxt: the XPath Parser context
7375 *
7376 * Implement the multiply operation on XPath objects:
7377 * The numeric operators convert their operands to numbers as if
7378 * by calling the number function.
7379 */
7380void
7381xmlXPathMultValues(xmlXPathParserContextPtr ctxt) {
7382 xmlXPathObjectPtr arg;
7383 double val;
7384
7385 arg = valuePop(ctxt);
7386 if (arg == NULL)
7387 XP_ERROR(XPATH_INVALID_OPERAND);
7388 val = xmlXPathCastToNumber(arg);
7389 xmlXPathReleaseObject(ctxt->context, arg);
7390 CAST_TO_NUMBER;
7391 CHECK_TYPE(XPATH_NUMBER);
7392 ctxt->value->floatval *= val;
7393}
7394
7395/**
7396 * xmlXPathDivValues:
7397 * @ctxt: the XPath Parser context
7398 *
7399 * Implement the div operation on XPath objects @arg1 / @arg2:
7400 * The numeric operators convert their operands to numbers as if
7401 * by calling the number function.
7402 */
7403void
7404xmlXPathDivValues(xmlXPathParserContextPtr ctxt) {
7405 xmlXPathObjectPtr arg;
7406 double val;
7407
7408 arg = valuePop(ctxt);
7409 if (arg == NULL)
7410 XP_ERROR(XPATH_INVALID_OPERAND);
7411 val = xmlXPathCastToNumber(arg);
7412 xmlXPathReleaseObject(ctxt->context, arg);
7413 CAST_TO_NUMBER;
7414 CHECK_TYPE(XPATH_NUMBER);
7415 if (xmlXPathIsNaN(val) || xmlXPathIsNaN(ctxt->value->floatval))
7416 ctxt->value->floatval = xmlXPathNAN;
7417 else if (val == 0 && xmlXPathGetSign(val) != 0) {
7418 if (ctxt->value->floatval == 0)
7419 ctxt->value->floatval = xmlXPathNAN;
7420 else if (ctxt->value->floatval > 0)
7421 ctxt->value->floatval = xmlXPathNINF;
7422 else if (ctxt->value->floatval < 0)
7423 ctxt->value->floatval = xmlXPathPINF;
7424 }
7425 else if (val == 0) {
7426 if (ctxt->value->floatval == 0)
7427 ctxt->value->floatval = xmlXPathNAN;
7428 else if (ctxt->value->floatval > 0)
7429 ctxt->value->floatval = xmlXPathPINF;
7430 else if (ctxt->value->floatval < 0)
7431 ctxt->value->floatval = xmlXPathNINF;
7432 } else
7433 ctxt->value->floatval /= val;
7434}
7435
7436/**
7437 * xmlXPathModValues:
7438 * @ctxt: the XPath Parser context
7439 *
7440 * Implement the mod operation on XPath objects: @arg1 / @arg2
7441 * The numeric operators convert their operands to numbers as if
7442 * by calling the number function.
7443 */
7444void
7445xmlXPathModValues(xmlXPathParserContextPtr ctxt) {
7446 xmlXPathObjectPtr arg;
7447 double arg1, arg2;
7448
7449 arg = valuePop(ctxt);
7450 if (arg == NULL)
7451 XP_ERROR(XPATH_INVALID_OPERAND);
7452 arg2 = xmlXPathCastToNumber(arg);
7453 xmlXPathReleaseObject(ctxt->context, arg);
7454 CAST_TO_NUMBER;
7455 CHECK_TYPE(XPATH_NUMBER);
7456 arg1 = ctxt->value->floatval;
7457 if (arg2 == 0)
7458 ctxt->value->floatval = xmlXPathNAN;
7459 else {
7460 ctxt->value->floatval = fmod(arg1, arg2);
7461 }
7462}
7463
7464/************************************************************************
7465 * *
7466 * The traversal functions *
7467 * *
7468 ************************************************************************/
7469
7470/*
7471 * A traversal function enumerates nodes along an axis.
7472 * Initially it must be called with NULL, and it indicates
7473 * termination on the axis by returning NULL.
7474 */
7475typedef xmlNodePtr (*xmlXPathTraversalFunction)
7476 (xmlXPathParserContextPtr ctxt, xmlNodePtr cur);
7477
7478/*
7479 * xmlXPathTraversalFunctionExt:
7480 * A traversal function enumerates nodes along an axis.
7481 * Initially it must be called with NULL, and it indicates
7482 * termination on the axis by returning NULL.
7483 * The context node of the traversal is specified via @contextNode.
7484 */
7485typedef xmlNodePtr (*xmlXPathTraversalFunctionExt)
7486 (xmlNodePtr cur, xmlNodePtr contextNode);
7487
7488/*
7489 * xmlXPathNodeSetMergeFunction:
7490 * Used for merging node sets in xmlXPathCollectAndTest().
7491 */
7492typedef xmlNodeSetPtr (*xmlXPathNodeSetMergeFunction)
7493 (xmlNodeSetPtr, xmlNodeSetPtr, int);
7494
7495
7496/**
7497 * xmlXPathNextSelf:
7498 * @ctxt: the XPath Parser context
7499 * @cur: the current node in the traversal
7500 *
7501 * Traversal function for the "self" direction
7502 * The self axis contains just the context node itself
7503 *
7504 * Returns the next element following that axis
7505 */
7506xmlNodePtr
7507xmlXPathNextSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7508 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7509 if (cur == NULL)
7510 return(ctxt->context->node);
7511 return(NULL);
7512}
7513
7514/**
7515 * xmlXPathNextChild:
7516 * @ctxt: the XPath Parser context
7517 * @cur: the current node in the traversal
7518 *
7519 * Traversal function for the "child" direction
7520 * The child axis contains the children of the context node in document order.
7521 *
7522 * Returns the next element following that axis
7523 */
7524xmlNodePtr
7525xmlXPathNextChild(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7526 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7527 if (cur == NULL) {
7528 if (ctxt->context->node == NULL) return(NULL);
7529 switch (ctxt->context->node->type) {
7530 case XML_ELEMENT_NODE:
7531 case XML_TEXT_NODE:
7532 case XML_CDATA_SECTION_NODE:
7533 case XML_ENTITY_REF_NODE:
7534 case XML_ENTITY_NODE:
7535 case XML_PI_NODE:
7536 case XML_COMMENT_NODE:
7537 case XML_NOTATION_NODE:
7538 case XML_DTD_NODE:
7539 return(ctxt->context->node->children);
7540 case XML_DOCUMENT_NODE:
7541 case XML_DOCUMENT_TYPE_NODE:
7542 case XML_DOCUMENT_FRAG_NODE:
7543 case XML_HTML_DOCUMENT_NODE:
7544#ifdef LIBXML_DOCB_ENABLED
7545 case XML_DOCB_DOCUMENT_NODE:
7546#endif
7547 return(((xmlDocPtr) ctxt->context->node)->children);
7548 case XML_ELEMENT_DECL:
7549 case XML_ATTRIBUTE_DECL:
7550 case XML_ENTITY_DECL:
7551 case XML_ATTRIBUTE_NODE:
7552 case XML_NAMESPACE_DECL:
7553 case XML_XINCLUDE_START:
7554 case XML_XINCLUDE_END:
7555 return(NULL);
7556 }
7557 return(NULL);
7558 }
7559 if ((cur->type == XML_DOCUMENT_NODE) ||
7560 (cur->type == XML_HTML_DOCUMENT_NODE))
7561 return(NULL);
7562 return(cur->next);
7563}
7564
7565/**
7566 * xmlXPathNextChildElement:
7567 * @ctxt: the XPath Parser context
7568 * @cur: the current node in the traversal
7569 *
7570 * Traversal function for the "child" direction and nodes of type element.
7571 * The child axis contains the children of the context node in document order.
7572 *
7573 * Returns the next element following that axis
7574 */
7575static xmlNodePtr
7576xmlXPathNextChildElement(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7577 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7578 if (cur == NULL) {
7579 cur = ctxt->context->node;
7580 if (cur == NULL) return(NULL);
7581 /*
7582 * Get the first element child.
7583 */
7584 switch (cur->type) {
7585 case XML_ELEMENT_NODE:
7586 case XML_DOCUMENT_FRAG_NODE:
7587 case XML_ENTITY_REF_NODE: /* URGENT TODO: entify-refs as well? */
7588 case XML_ENTITY_NODE:
7589 cur = cur->children;
7590 if (cur != NULL) {
7591 if (cur->type == XML_ELEMENT_NODE)
7592 return(cur);
7593 do {
7594 cur = cur->next;
7595 } while ((cur != NULL) &&
7596 (cur->type != XML_ELEMENT_NODE));
7597 return(cur);
7598 }
7599 return(NULL);
7600 case XML_DOCUMENT_NODE:
7601 case XML_HTML_DOCUMENT_NODE:
7602#ifdef LIBXML_DOCB_ENABLED
7603 case XML_DOCB_DOCUMENT_NODE:
7604#endif
7605 return(xmlDocGetRootElement((xmlDocPtr) cur));
7606 default:
7607 return(NULL);
7608 }
7609 return(NULL);
7610 }
7611 /*
7612 * Get the next sibling element node.
7613 */
7614 switch (cur->type) {
7615 case XML_ELEMENT_NODE:
7616 case XML_TEXT_NODE:
7617 case XML_ENTITY_REF_NODE:
7618 case XML_ENTITY_NODE:
7619 case XML_CDATA_SECTION_NODE:
7620 case XML_PI_NODE:
7621 case XML_COMMENT_NODE:
7622 case XML_XINCLUDE_END:
7623 break;
7624 /* case XML_DTD_NODE: */ /* URGENT TODO: DTD-node as well? */
7625 default:
7626 return(NULL);
7627 }
7628 if (cur->next != NULL) {
7629 if (cur->next->type == XML_ELEMENT_NODE)
7630 return(cur->next);
7631 cur = cur->next;
7632 do {
7633 cur = cur->next;
7634 } while ((cur != NULL) && (cur->type != XML_ELEMENT_NODE));
7635 return(cur);
7636 }
7637 return(NULL);
7638}
7639
7640/**
7641 * xmlXPathNextDescendantOrSelfElemParent:
7642 * @ctxt: the XPath Parser context
7643 * @cur: the current node in the traversal
7644 *
7645 * Traversal function for the "descendant-or-self" axis.
7646 * Additionally it returns only nodes which can be parents of
7647 * element nodes.
7648 *
7649 *
7650 * Returns the next element following that axis
7651 */
7652static xmlNodePtr
7653xmlXPathNextDescendantOrSelfElemParent(xmlNodePtr cur,
7654 xmlNodePtr contextNode)
7655{
7656 if (cur == NULL) {
7657 if (contextNode == NULL)
7658 return(NULL);
7659 switch (contextNode->type) {
7660 case XML_ELEMENT_NODE:
7661 case XML_XINCLUDE_START:
7662 case XML_DOCUMENT_FRAG_NODE:
7663 case XML_DOCUMENT_NODE:
7664#ifdef LIBXML_DOCB_ENABLED
7665 case XML_DOCB_DOCUMENT_NODE:
7666#endif
7667 case XML_HTML_DOCUMENT_NODE:
7668 return(contextNode);
7669 default:
7670 return(NULL);
7671 }
7672 return(NULL);
7673 } else {
7674 xmlNodePtr start = cur;
7675
7676 while (cur != NULL) {
7677 switch (cur->type) {
7678 case XML_ELEMENT_NODE:
7679 /* TODO: OK to have XInclude here? */
7680 case XML_XINCLUDE_START:
7681 case XML_DOCUMENT_FRAG_NODE:
7682 if (cur != start)
7683 return(cur);
7684 if (cur->children != NULL) {
7685 cur = cur->children;
7686 continue;
7687 }
7688 break;
7689 /* Not sure if we need those here. */
7690 case XML_DOCUMENT_NODE:
7691#ifdef LIBXML_DOCB_ENABLED
7692 case XML_DOCB_DOCUMENT_NODE:
7693#endif
7694 case XML_HTML_DOCUMENT_NODE:
7695 if (cur != start)
7696 return(cur);
7697 return(xmlDocGetRootElement((xmlDocPtr) cur));
7698 default:
7699 break;
7700 }
7701
7702next_sibling:
7703 if ((cur == NULL) || (cur == contextNode))
7704 return(NULL);
7705 if (cur->next != NULL) {
7706 cur = cur->next;
7707 } else {
7708 cur = cur->parent;
7709 goto next_sibling;
7710 }
7711 }
7712 }
7713 return(NULL);
7714}
7715
7716/**
7717 * xmlXPathNextDescendant:
7718 * @ctxt: the XPath Parser context
7719 * @cur: the current node in the traversal
7720 *
7721 * Traversal function for the "descendant" direction
7722 * the descendant axis contains the descendants of the context node in document
7723 * order; a descendant is a child or a child of a child and so on.
7724 *
7725 * Returns the next element following that axis
7726 */
7727xmlNodePtr
7728xmlXPathNextDescendant(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7729 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7730 if (cur == NULL) {
7731 if (ctxt->context->node == NULL)
7732 return(NULL);
7733 if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) ||
7734 (ctxt->context->node->type == XML_NAMESPACE_DECL))
7735 return(NULL);
7736
7737 if (ctxt->context->node == (xmlNodePtr) ctxt->context->doc)
7738 return(ctxt->context->doc->children);
7739 return(ctxt->context->node->children);
7740 }
7741
7742 if (cur->children != NULL) {
7743 /*
7744 * Do not descend on entities declarations
7745 */
7746 if (cur->children->type != XML_ENTITY_DECL) {
7747 cur = cur->children;
7748 /*
7749 * Skip DTDs
7750 */
7751 if (cur->type != XML_DTD_NODE)
7752 return(cur);
7753 }
7754 }
7755
7756 if (cur == ctxt->context->node) return(NULL);
7757
7758 while (cur->next != NULL) {
7759 cur = cur->next;
7760 if ((cur->type != XML_ENTITY_DECL) &&
7761 (cur->type != XML_DTD_NODE))
7762 return(cur);
7763 }
7764
7765 do {
7766 cur = cur->parent;
7767 if (cur == NULL) break;
7768 if (cur == ctxt->context->node) return(NULL);
7769 if (cur->next != NULL) {
7770 cur = cur->next;
7771 return(cur);
7772 }
7773 } while (cur != NULL);
7774 return(cur);
7775}
7776
7777/**
7778 * xmlXPathNextDescendantOrSelf:
7779 * @ctxt: the XPath Parser context
7780 * @cur: the current node in the traversal
7781 *
7782 * Traversal function for the "descendant-or-self" direction
7783 * the descendant-or-self axis contains the context node and the descendants
7784 * of the context node in document order; thus the context node is the first
7785 * node on the axis, and the first child of the context node is the second node
7786 * on the axis
7787 *
7788 * Returns the next element following that axis
7789 */
7790xmlNodePtr
7791xmlXPathNextDescendantOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7792 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7793 if (cur == NULL) {
7794 if (ctxt->context->node == NULL)
7795 return(NULL);
7796 if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) ||
7797 (ctxt->context->node->type == XML_NAMESPACE_DECL))
7798 return(NULL);
7799 return(ctxt->context->node);
7800 }
7801
7802 return(xmlXPathNextDescendant(ctxt, cur));
7803}
7804
7805/**
7806 * xmlXPathNextParent:
7807 * @ctxt: the XPath Parser context
7808 * @cur: the current node in the traversal
7809 *
7810 * Traversal function for the "parent" direction
7811 * The parent axis contains the parent of the context node, if there is one.
7812 *
7813 * Returns the next element following that axis
7814 */
7815xmlNodePtr
7816xmlXPathNextParent(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7817 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7818 /*
7819 * the parent of an attribute or namespace node is the element
7820 * to which the attribute or namespace node is attached
7821 * Namespace handling !!!
7822 */
7823 if (cur == NULL) {
7824 if (ctxt->context->node == NULL) return(NULL);
7825 switch (ctxt->context->node->type) {
7826 case XML_ELEMENT_NODE:
7827 case XML_TEXT_NODE:
7828 case XML_CDATA_SECTION_NODE:
7829 case XML_ENTITY_REF_NODE:
7830 case XML_ENTITY_NODE:
7831 case XML_PI_NODE:
7832 case XML_COMMENT_NODE:
7833 case XML_NOTATION_NODE:
7834 case XML_DTD_NODE:
7835 case XML_ELEMENT_DECL:
7836 case XML_ATTRIBUTE_DECL:
7837 case XML_XINCLUDE_START:
7838 case XML_XINCLUDE_END:
7839 case XML_ENTITY_DECL:
7840 if (ctxt->context->node->parent == NULL)
7841 return((xmlNodePtr) ctxt->context->doc);
7842 if ((ctxt->context->node->parent->type == XML_ELEMENT_NODE) &&
7843 ((ctxt->context->node->parent->name[0] == ' ') ||
7844 (xmlStrEqual(ctxt->context->node->parent->name,
7845 BAD_CAST "fake node libxslt"))))
7846 return(NULL);
7847 return(ctxt->context->node->parent);
7848 case XML_ATTRIBUTE_NODE: {
7849 xmlAttrPtr att = (xmlAttrPtr) ctxt->context->node;
7850
7851 return(att->parent);
7852 }
7853 case XML_DOCUMENT_NODE:
7854 case XML_DOCUMENT_TYPE_NODE:
7855 case XML_DOCUMENT_FRAG_NODE:
7856 case XML_HTML_DOCUMENT_NODE:
7857#ifdef LIBXML_DOCB_ENABLED
7858 case XML_DOCB_DOCUMENT_NODE:
7859#endif
7860 return(NULL);
7861 case XML_NAMESPACE_DECL: {
7862 xmlNsPtr ns = (xmlNsPtr) ctxt->context->node;
7863
7864 if ((ns->next != NULL) &&
7865 (ns->next->type != XML_NAMESPACE_DECL))
7866 return((xmlNodePtr) ns->next);
7867 return(NULL);
7868 }
7869 }
7870 }
7871 return(NULL);
7872}
7873
7874/**
7875 * xmlXPathNextAncestor:
7876 * @ctxt: the XPath Parser context
7877 * @cur: the current node in the traversal
7878 *
7879 * Traversal function for the "ancestor" direction
7880 * the ancestor axis contains the ancestors of the context node; the ancestors
7881 * of the context node consist of the parent of context node and the parent's
7882 * parent and so on; the nodes are ordered in reverse document order; thus the
7883 * parent is the first node on the axis, and the parent's parent is the second
7884 * node on the axis
7885 *
7886 * Returns the next element following that axis
7887 */
7888xmlNodePtr
7889xmlXPathNextAncestor(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
7890 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
7891 /*
7892 * the parent of an attribute or namespace node is the element
7893 * to which the attribute or namespace node is attached
7894 * !!!!!!!!!!!!!
7895 */
7896 if (cur == NULL) {
7897 if (ctxt->context->node == NULL) return(NULL);
7898 switch (ctxt->context->node->type) {
7899 case XML_ELEMENT_NODE:
7900 case XML_TEXT_NODE:
7901 case XML_CDATA_SECTION_NODE:
7902 case XML_ENTITY_REF_NODE:
7903 case XML_ENTITY_NODE:
7904 case XML_PI_NODE:
7905 case XML_COMMENT_NODE:
7906 case XML_DTD_NODE:
7907 case XML_ELEMENT_DECL:
7908 case XML_ATTRIBUTE_DECL:
7909 case XML_ENTITY_DECL:
7910 case XML_NOTATION_NODE:
7911 case XML_XINCLUDE_START:
7912 case XML_XINCLUDE_END:
7913 if (ctxt->context->node->parent == NULL)
7914 return((xmlNodePtr) ctxt->context->doc);
7915 if ((ctxt->context->node->parent->type == XML_ELEMENT_NODE) &&
7916 ((ctxt->context->node->parent->name[0] == ' ') ||
7917 (xmlStrEqual(ctxt->context->node->parent->name,
7918 BAD_CAST "fake node libxslt"))))
7919 return(NULL);
7920 return(ctxt->context->node->parent);
7921 case XML_ATTRIBUTE_NODE: {
7922 xmlAttrPtr tmp = (xmlAttrPtr) ctxt->context->node;
7923
7924 return(tmp->parent);
7925 }
7926 case XML_DOCUMENT_NODE:
7927 case XML_DOCUMENT_TYPE_NODE:
7928 case XML_DOCUMENT_FRAG_NODE:
7929 case XML_HTML_DOCUMENT_NODE:
7930#ifdef LIBXML_DOCB_ENABLED
7931 case XML_DOCB_DOCUMENT_NODE:
7932#endif
7933 return(NULL);
7934 case XML_NAMESPACE_DECL: {
7935 xmlNsPtr ns = (xmlNsPtr) ctxt->context->node;
7936
7937 if ((ns->next != NULL) &&
7938 (ns->next->type != XML_NAMESPACE_DECL))
7939 return((xmlNodePtr) ns->next);
7940 /* Bad, how did that namespace end up here ? */
7941 return(NULL);
7942 }
7943 }
7944 return(NULL);
7945 }
7946 if (cur == ctxt->context->doc->children)
7947 return((xmlNodePtr) ctxt->context->doc);
7948 if (cur == (xmlNodePtr) ctxt->context->doc)
7949 return(NULL);
7950 switch (cur->type) {
7951 case XML_ELEMENT_NODE:
7952 case XML_TEXT_NODE:
7953 case XML_CDATA_SECTION_NODE:
7954 case XML_ENTITY_REF_NODE:
7955 case XML_ENTITY_NODE:
7956 case XML_PI_NODE:
7957 case XML_COMMENT_NODE:
7958 case XML_NOTATION_NODE:
7959 case XML_DTD_NODE:
7960 case XML_ELEMENT_DECL:
7961 case XML_ATTRIBUTE_DECL:
7962 case XML_ENTITY_DECL:
7963 case XML_XINCLUDE_START:
7964 case XML_XINCLUDE_END:
7965 if (cur->parent == NULL)
7966 return(NULL);
7967 if ((cur->parent->type == XML_ELEMENT_NODE) &&
7968 ((cur->parent->name[0] == ' ') ||
7969 (xmlStrEqual(cur->parent->name,
7970 BAD_CAST "fake node libxslt"))))
7971 return(NULL);
7972 return(cur->parent);
7973 case XML_ATTRIBUTE_NODE: {
7974 xmlAttrPtr att = (xmlAttrPtr) ctxt->context->node;
7975
7976 return(att->parent);
7977 }
7978 case XML_NAMESPACE_DECL: {
7979 xmlNsPtr ns = (xmlNsPtr) ctxt->context->node;
7980
7981 if ((ns->next != NULL) &&
7982 (ns->next->type != XML_NAMESPACE_DECL))
7983 return((xmlNodePtr) ns->next);
7984 /* Bad, how did that namespace end up here ? */
7985 return(NULL);
7986 }
7987 case XML_DOCUMENT_NODE:
7988 case XML_DOCUMENT_TYPE_NODE:
7989 case XML_DOCUMENT_FRAG_NODE:
7990 case XML_HTML_DOCUMENT_NODE:
7991#ifdef LIBXML_DOCB_ENABLED
7992 case XML_DOCB_DOCUMENT_NODE:
7993#endif
7994 return(NULL);
7995 }
7996 return(NULL);
7997}
7998
7999/**
8000 * xmlXPathNextAncestorOrSelf:
8001 * @ctxt: the XPath Parser context
8002 * @cur: the current node in the traversal
8003 *
8004 * Traversal function for the "ancestor-or-self" direction
8005 * he ancestor-or-self axis contains the context node and ancestors of
8006 * the context node in reverse document order; thus the context node is
8007 * the first node on the axis, and the context node's parent the second;
8008 * parent here is defined the same as with the parent axis.
8009 *
8010 * Returns the next element following that axis
8011 */
8012xmlNodePtr
8013xmlXPathNextAncestorOrSelf(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8014 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8015 if (cur == NULL)
8016 return(ctxt->context->node);
8017 return(xmlXPathNextAncestor(ctxt, cur));
8018}
8019
8020/**
8021 * xmlXPathNextFollowingSibling:
8022 * @ctxt: the XPath Parser context
8023 * @cur: the current node in the traversal
8024 *
8025 * Traversal function for the "following-sibling" direction
8026 * The following-sibling axis contains the following siblings of the context
8027 * node in document order.
8028 *
8029 * Returns the next element following that axis
8030 */
8031xmlNodePtr
8032xmlXPathNextFollowingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8033 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8034 if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) ||
8035 (ctxt->context->node->type == XML_NAMESPACE_DECL))
8036 return(NULL);
8037 if (cur == (xmlNodePtr) ctxt->context->doc)
8038 return(NULL);
8039 if (cur == NULL)
8040 return(ctxt->context->node->next);
8041 return(cur->next);
8042}
8043
8044/**
8045 * xmlXPathNextPrecedingSibling:
8046 * @ctxt: the XPath Parser context
8047 * @cur: the current node in the traversal
8048 *
8049 * Traversal function for the "preceding-sibling" direction
8050 * The preceding-sibling axis contains the preceding siblings of the context
8051 * node in reverse document order; the first preceding sibling is first on the
8052 * axis; the sibling preceding that node is the second on the axis and so on.
8053 *
8054 * Returns the next element following that axis
8055 */
8056xmlNodePtr
8057xmlXPathNextPrecedingSibling(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8058 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8059 if ((ctxt->context->node->type == XML_ATTRIBUTE_NODE) ||
8060 (ctxt->context->node->type == XML_NAMESPACE_DECL))
8061 return(NULL);
8062 if (cur == (xmlNodePtr) ctxt->context->doc)
8063 return(NULL);
8064 if (cur == NULL)
8065 return(ctxt->context->node->prev);
8066 if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE)) {
8067 cur = cur->prev;
8068 if (cur == NULL)
8069 return(ctxt->context->node->prev);
8070 }
8071 return(cur->prev);
8072}
8073
8074/**
8075 * xmlXPathNextFollowing:
8076 * @ctxt: the XPath Parser context
8077 * @cur: the current node in the traversal
8078 *
8079 * Traversal function for the "following" direction
8080 * The following axis contains all nodes in the same document as the context
8081 * node that are after the context node in document order, excluding any
8082 * descendants and excluding attribute nodes and namespace nodes; the nodes
8083 * are ordered in document order
8084 *
8085 * Returns the next element following that axis
8086 */
8087xmlNodePtr
8088xmlXPathNextFollowing(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8089 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8090 if (cur != NULL && cur->children != NULL)
8091 return cur->children ;
8092 if (cur == NULL) cur = ctxt->context->node;
8093 if (cur == NULL) return(NULL) ; /* ERROR */
8094 if (cur->next != NULL) return(cur->next) ;
8095 do {
8096 cur = cur->parent;
8097 if (cur == NULL) break;
8098 if (cur == (xmlNodePtr) ctxt->context->doc) return(NULL);
8099 if (cur->next != NULL) return(cur->next);
8100 } while (cur != NULL);
8101 return(cur);
8102}
8103
8104/*
8105 * xmlXPathIsAncestor:
8106 * @ancestor: the ancestor node
8107 * @node: the current node
8108 *
8109 * Check that @ancestor is a @node's ancestor
8110 *
8111 * returns 1 if @ancestor is a @node's ancestor, 0 otherwise.
8112 */
8113static int
8114xmlXPathIsAncestor(xmlNodePtr ancestor, xmlNodePtr node) {
8115 if ((ancestor == NULL) || (node == NULL)) return(0);
8116 /* nodes need to be in the same document */
8117 if (ancestor->doc != node->doc) return(0);
8118 /* avoid searching if ancestor or node is the root node */
8119 if (ancestor == (xmlNodePtr) node->doc) return(1);
8120 if (node == (xmlNodePtr) ancestor->doc) return(0);
8121 while (node->parent != NULL) {
8122 if (node->parent == ancestor)
8123 return(1);
8124 node = node->parent;
8125 }
8126 return(0);
8127}
8128
8129/**
8130 * xmlXPathNextPreceding:
8131 * @ctxt: the XPath Parser context
8132 * @cur: the current node in the traversal
8133 *
8134 * Traversal function for the "preceding" direction
8135 * the preceding axis contains all nodes in the same document as the context
8136 * node that are before the context node in document order, excluding any
8137 * ancestors and excluding attribute nodes and namespace nodes; the nodes are
8138 * ordered in reverse document order
8139 *
8140 * Returns the next element following that axis
8141 */
8142xmlNodePtr
8143xmlXPathNextPreceding(xmlXPathParserContextPtr ctxt, xmlNodePtr cur)
8144{
8145 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8146 if (cur == NULL)
8147 cur = ctxt->context->node;
8148 if (cur == NULL)
8149 return (NULL);
8150 if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE))
8151 cur = cur->prev;
8152 do {
8153 if (cur->prev != NULL) {
8154 for (cur = cur->prev; cur->last != NULL; cur = cur->last) ;
8155 return (cur);
8156 }
8157
8158 cur = cur->parent;
8159 if (cur == NULL)
8160 return (NULL);
8161 if (cur == ctxt->context->doc->children)
8162 return (NULL);
8163 } while (xmlXPathIsAncestor(cur, ctxt->context->node));
8164 return (cur);
8165}
8166
8167/**
8168 * xmlXPathNextPrecedingInternal:
8169 * @ctxt: the XPath Parser context
8170 * @cur: the current node in the traversal
8171 *
8172 * Traversal function for the "preceding" direction
8173 * the preceding axis contains all nodes in the same document as the context
8174 * node that are before the context node in document order, excluding any
8175 * ancestors and excluding attribute nodes and namespace nodes; the nodes are
8176 * ordered in reverse document order
8177 * This is a faster implementation but internal only since it requires a
8178 * state kept in the parser context: ctxt->ancestor.
8179 *
8180 * Returns the next element following that axis
8181 */
8182static xmlNodePtr
8183xmlXPathNextPrecedingInternal(xmlXPathParserContextPtr ctxt,
8184 xmlNodePtr cur)
8185{
8186 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8187 if (cur == NULL) {
8188 cur = ctxt->context->node;
8189 if (cur == NULL)
8190 return (NULL);
8191 if (cur->type == XML_NAMESPACE_DECL)
8192 cur = (xmlNodePtr)((xmlNsPtr)cur)->next;
8193 ctxt->ancestor = cur->parent;
8194 }
8195 if ((cur->prev != NULL) && (cur->prev->type == XML_DTD_NODE))
8196 cur = cur->prev;
8197 while (cur->prev == NULL) {
8198 cur = cur->parent;
8199 if (cur == NULL)
8200 return (NULL);
8201 if (cur == ctxt->context->doc->children)
8202 return (NULL);
8203 if (cur != ctxt->ancestor)
8204 return (cur);
8205 ctxt->ancestor = cur->parent;
8206 }
8207 cur = cur->prev;
8208 while (cur->last != NULL)
8209 cur = cur->last;
8210 return (cur);
8211}
8212
8213/**
8214 * xmlXPathNextNamespace:
8215 * @ctxt: the XPath Parser context
8216 * @cur: the current attribute in the traversal
8217 *
8218 * Traversal function for the "namespace" direction
8219 * the namespace axis contains the namespace nodes of the context node;
8220 * the order of nodes on this axis is implementation-defined; the axis will
8221 * be empty unless the context node is an element
8222 *
8223 * We keep the XML namespace node at the end of the list.
8224 *
8225 * Returns the next element following that axis
8226 */
8227xmlNodePtr
8228xmlXPathNextNamespace(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8229 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8230 if (ctxt->context->node->type != XML_ELEMENT_NODE) return(NULL);
8231 if (ctxt->context->tmpNsList == NULL && cur != (xmlNodePtr) xmlXPathXMLNamespace) {
8232 if (ctxt->context->tmpNsList != NULL)
8233 xmlFree(ctxt->context->tmpNsList);
8234 ctxt->context->tmpNsList =
8235 xmlGetNsList(ctxt->context->doc, ctxt->context->node);
8236 ctxt->context->tmpNsNr = 0;
8237 if (ctxt->context->tmpNsList != NULL) {
8238 while (ctxt->context->tmpNsList[ctxt->context->tmpNsNr] != NULL) {
8239 ctxt->context->tmpNsNr++;
8240 }
8241 }
8242 return((xmlNodePtr) xmlXPathXMLNamespace);
8243 }
8244 if (ctxt->context->tmpNsNr > 0) {
8245 return (xmlNodePtr)ctxt->context->tmpNsList[--ctxt->context->tmpNsNr];
8246 } else {
8247 if (ctxt->context->tmpNsList != NULL)
8248 xmlFree(ctxt->context->tmpNsList);
8249 ctxt->context->tmpNsList = NULL;
8250 return(NULL);
8251 }
8252}
8253
8254/**
8255 * xmlXPathNextAttribute:
8256 * @ctxt: the XPath Parser context
8257 * @cur: the current attribute in the traversal
8258 *
8259 * Traversal function for the "attribute" direction
8260 * TODO: support DTD inherited default attributes
8261 *
8262 * Returns the next element following that axis
8263 */
8264xmlNodePtr
8265xmlXPathNextAttribute(xmlXPathParserContextPtr ctxt, xmlNodePtr cur) {
8266 if ((ctxt == NULL) || (ctxt->context == NULL)) return(NULL);
8267 if (ctxt->context->node == NULL)
8268 return(NULL);
8269 if (ctxt->context->node->type != XML_ELEMENT_NODE)
8270 return(NULL);
8271 if (cur == NULL) {
8272 if (ctxt->context->node == (xmlNodePtr) ctxt->context->doc)
8273 return(NULL);
8274 return((xmlNodePtr)ctxt->context->node->properties);
8275 }
8276 return((xmlNodePtr)cur->next);
8277}
8278
8279/************************************************************************
8280 * *
8281 * NodeTest Functions *
8282 * *
8283 ************************************************************************/
8284
8285#define IS_FUNCTION 200
8286
8287
8288/************************************************************************
8289 * *
8290 * Implicit tree core function library *
8291 * *
8292 ************************************************************************/
8293
8294/**
8295 * xmlXPathRoot:
8296 * @ctxt: the XPath Parser context
8297 *
8298 * Initialize the context to the root of the document
8299 */
8300void
8301xmlXPathRoot(xmlXPathParserContextPtr ctxt) {
8302 if ((ctxt == NULL) || (ctxt->context == NULL))
8303 return;
8304 ctxt->context->node = (xmlNodePtr) ctxt->context->doc;
8305 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
8306 ctxt->context->node));
8307}
8308
8309/************************************************************************
8310 * *
8311 * The explicit core function library *
8312 *http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html#corelib *
8313 * *
8314 ************************************************************************/
8315
8316
8317/**
8318 * xmlXPathLastFunction:
8319 * @ctxt: the XPath Parser context
8320 * @nargs: the number of arguments
8321 *
8322 * Implement the last() XPath function
8323 * number last()
8324 * The last function returns the number of nodes in the context node list.
8325 */
8326void
8327xmlXPathLastFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8328 CHECK_ARITY(0);
8329 if (ctxt->context->contextSize >= 0) {
8330 valuePush(ctxt,
8331 xmlXPathCacheNewFloat(ctxt->context,
8332 (double) ctxt->context->contextSize));
8333#ifdef DEBUG_EXPR
8334 xmlGenericError(xmlGenericErrorContext,
8335 "last() : %d\n", ctxt->context->contextSize);
8336#endif
8337 } else {
8338 XP_ERROR(XPATH_INVALID_CTXT_SIZE);
8339 }
8340}
8341
8342/**
8343 * xmlXPathPositionFunction:
8344 * @ctxt: the XPath Parser context
8345 * @nargs: the number of arguments
8346 *
8347 * Implement the position() XPath function
8348 * number position()
8349 * The position function returns the position of the context node in the
8350 * context node list. The first position is 1, and so the last position
8351 * will be equal to last().
8352 */
8353void
8354xmlXPathPositionFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8355 CHECK_ARITY(0);
8356 if (ctxt->context->proximityPosition >= 0) {
8357 valuePush(ctxt,
8358 xmlXPathCacheNewFloat(ctxt->context,
8359 (double) ctxt->context->proximityPosition));
8360#ifdef DEBUG_EXPR
8361 xmlGenericError(xmlGenericErrorContext, "position() : %d\n",
8362 ctxt->context->proximityPosition);
8363#endif
8364 } else {
8365 XP_ERROR(XPATH_INVALID_CTXT_POSITION);
8366 }
8367}
8368
8369/**
8370 * xmlXPathCountFunction:
8371 * @ctxt: the XPath Parser context
8372 * @nargs: the number of arguments
8373 *
8374 * Implement the count() XPath function
8375 * number count(node-set)
8376 */
8377void
8378xmlXPathCountFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8379 xmlXPathObjectPtr cur;
8380
8381 CHECK_ARITY(1);
8382 if ((ctxt->value == NULL) ||
8383 ((ctxt->value->type != XPATH_NODESET) &&
8384 (ctxt->value->type != XPATH_XSLT_TREE)))
8385 XP_ERROR(XPATH_INVALID_TYPE);
8386 cur = valuePop(ctxt);
8387
8388 if ((cur == NULL) || (cur->nodesetval == NULL))
8389 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) 0));
8390 else if ((cur->type == XPATH_NODESET) || (cur->type == XPATH_XSLT_TREE)) {
8391 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context,
8392 (double) cur->nodesetval->nodeNr));
8393 } else {
8394 if ((cur->nodesetval->nodeNr != 1) ||
8395 (cur->nodesetval->nodeTab == NULL)) {
8396 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) 0));
8397 } else {
8398 xmlNodePtr tmp;
8399 int i = 0;
8400
8401 tmp = cur->nodesetval->nodeTab[0];
8402 if (tmp != NULL) {
8403 tmp = tmp->children;
8404 while (tmp != NULL) {
8405 tmp = tmp->next;
8406 i++;
8407 }
8408 }
8409 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, (double) i));
8410 }
8411 }
8412 xmlXPathReleaseObject(ctxt->context, cur);
8413}
8414
8415/**
8416 * xmlXPathGetElementsByIds:
8417 * @doc: the document
8418 * @ids: a whitespace separated list of IDs
8419 *
8420 * Selects elements by their unique ID.
8421 *
8422 * Returns a node-set of selected elements.
8423 */
8424static xmlNodeSetPtr
8425xmlXPathGetElementsByIds (xmlDocPtr doc, const xmlChar *ids) {
8426 xmlNodeSetPtr ret;
8427 const xmlChar *cur = ids;
8428 xmlChar *ID;
8429 xmlAttrPtr attr;
8430 xmlNodePtr elem = NULL;
8431
8432 if (ids == NULL) return(NULL);
8433
8434 ret = xmlXPathNodeSetCreate(NULL);
8435
8436 while (IS_BLANK_CH(*cur)) cur++;
8437 while (*cur != 0) {
8438 while ((!IS_BLANK_CH(*cur)) && (*cur != 0))
8439 cur++;
8440
8441 ID = xmlStrndup(ids, cur - ids);
8442 if (ID != NULL) {
8443 /*
8444 * We used to check the fact that the value passed
8445 * was an NCName, but this generated much troubles for
8446 * me and Aleksey Sanin, people blatantly violated that
8447 * constaint, like Visa3D spec.
8448 * if (xmlValidateNCName(ID, 1) == 0)
8449 */
8450 attr = xmlGetID(doc, ID);
8451 if (attr != NULL) {
8452 if (attr->type == XML_ATTRIBUTE_NODE)
8453 elem = attr->parent;
8454 else if (attr->type == XML_ELEMENT_NODE)
8455 elem = (xmlNodePtr) attr;
8456 else
8457 elem = NULL;
8458 if (elem != NULL)
8459 xmlXPathNodeSetAdd(ret, elem);
8460 }
8461 xmlFree(ID);
8462 }
8463
8464 while (IS_BLANK_CH(*cur)) cur++;
8465 ids = cur;
8466 }
8467 return(ret);
8468}
8469
8470/**
8471 * xmlXPathIdFunction:
8472 * @ctxt: the XPath Parser context
8473 * @nargs: the number of arguments
8474 *
8475 * Implement the id() XPath function
8476 * node-set id(object)
8477 * The id function selects elements by their unique ID
8478 * (see [5.2.1 Unique IDs]). When the argument to id is of type node-set,
8479 * then the result is the union of the result of applying id to the
8480 * string value of each of the nodes in the argument node-set. When the
8481 * argument to id is of any other type, the argument is converted to a
8482 * string as if by a call to the string function; the string is split
8483 * into a whitespace-separated list of tokens (whitespace is any sequence
8484 * of characters matching the production S); the result is a node-set
8485 * containing the elements in the same document as the context node that
8486 * have a unique ID equal to any of the tokens in the list.
8487 */
8488void
8489xmlXPathIdFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8490 xmlChar *tokens;
8491 xmlNodeSetPtr ret;
8492 xmlXPathObjectPtr obj;
8493
8494 CHECK_ARITY(1);
8495 obj = valuePop(ctxt);
8496 if (obj == NULL) XP_ERROR(XPATH_INVALID_OPERAND);
8497 if ((obj->type == XPATH_NODESET) || (obj->type == XPATH_XSLT_TREE)) {
8498 xmlNodeSetPtr ns;
8499 int i;
8500
8501 ret = xmlXPathNodeSetCreate(NULL);
8502
8503 if (obj->nodesetval != NULL) {
8504 for (i = 0; i < obj->nodesetval->nodeNr; i++) {
8505 tokens =
8506 xmlXPathCastNodeToString(obj->nodesetval->nodeTab[i]);
8507 ns = xmlXPathGetElementsByIds(ctxt->context->doc, tokens);
8508 ret = xmlXPathNodeSetMerge(ret, ns);
8509 xmlXPathFreeNodeSet(ns);
8510 if (tokens != NULL)
8511 xmlFree(tokens);
8512 }
8513 }
8514 xmlXPathReleaseObject(ctxt->context, obj);
8515 valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, ret));
8516 return;
8517 }
8518 obj = xmlXPathCacheConvertString(ctxt->context, obj);
8519 ret = xmlXPathGetElementsByIds(ctxt->context->doc, obj->stringval);
8520 valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, ret));
8521 xmlXPathReleaseObject(ctxt->context, obj);
8522 return;
8523}
8524
8525/**
8526 * xmlXPathLocalNameFunction:
8527 * @ctxt: the XPath Parser context
8528 * @nargs: the number of arguments
8529 *
8530 * Implement the local-name() XPath function
8531 * string local-name(node-set?)
8532 * The local-name function returns a string containing the local part
8533 * of the name of the node in the argument node-set that is first in
8534 * document order. If the node-set is empty or the first node has no
8535 * name, an empty string is returned. If the argument is omitted it
8536 * defaults to the context node.
8537 */
8538void
8539xmlXPathLocalNameFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8540 xmlXPathObjectPtr cur;
8541
8542 if (ctxt == NULL) return;
8543
8544 if (nargs == 0) {
8545 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
8546 ctxt->context->node));
8547 nargs = 1;
8548 }
8549
8550 CHECK_ARITY(1);
8551 if ((ctxt->value == NULL) ||
8552 ((ctxt->value->type != XPATH_NODESET) &&
8553 (ctxt->value->type != XPATH_XSLT_TREE)))
8554 XP_ERROR(XPATH_INVALID_TYPE);
8555 cur = valuePop(ctxt);
8556
8557 if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) {
8558 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8559 } else {
8560 int i = 0; /* Should be first in document order !!!!! */
8561 switch (cur->nodesetval->nodeTab[i]->type) {
8562 case XML_ELEMENT_NODE:
8563 case XML_ATTRIBUTE_NODE:
8564 case XML_PI_NODE:
8565 if (cur->nodesetval->nodeTab[i]->name[0] == ' ')
8566 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8567 else
8568 valuePush(ctxt,
8569 xmlXPathCacheNewString(ctxt->context,
8570 cur->nodesetval->nodeTab[i]->name));
8571 break;
8572 case XML_NAMESPACE_DECL:
8573 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
8574 ((xmlNsPtr)cur->nodesetval->nodeTab[i])->prefix));
8575 break;
8576 default:
8577 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8578 }
8579 }
8580 xmlXPathReleaseObject(ctxt->context, cur);
8581}
8582
8583/**
8584 * xmlXPathNamespaceURIFunction:
8585 * @ctxt: the XPath Parser context
8586 * @nargs: the number of arguments
8587 *
8588 * Implement the namespace-uri() XPath function
8589 * string namespace-uri(node-set?)
8590 * The namespace-uri function returns a string containing the
8591 * namespace URI of the expanded name of the node in the argument
8592 * node-set that is first in document order. If the node-set is empty,
8593 * the first node has no name, or the expanded name has no namespace
8594 * URI, an empty string is returned. If the argument is omitted it
8595 * defaults to the context node.
8596 */
8597void
8598xmlXPathNamespaceURIFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8599 xmlXPathObjectPtr cur;
8600
8601 if (ctxt == NULL) return;
8602
8603 if (nargs == 0) {
8604 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
8605 ctxt->context->node));
8606 nargs = 1;
8607 }
8608 CHECK_ARITY(1);
8609 if ((ctxt->value == NULL) ||
8610 ((ctxt->value->type != XPATH_NODESET) &&
8611 (ctxt->value->type != XPATH_XSLT_TREE)))
8612 XP_ERROR(XPATH_INVALID_TYPE);
8613 cur = valuePop(ctxt);
8614
8615 if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) {
8616 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8617 } else {
8618 int i = 0; /* Should be first in document order !!!!! */
8619 switch (cur->nodesetval->nodeTab[i]->type) {
8620 case XML_ELEMENT_NODE:
8621 case XML_ATTRIBUTE_NODE:
8622 if (cur->nodesetval->nodeTab[i]->ns == NULL)
8623 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8624 else
8625 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
8626 cur->nodesetval->nodeTab[i]->ns->href));
8627 break;
8628 default:
8629 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8630 }
8631 }
8632 xmlXPathReleaseObject(ctxt->context, cur);
8633}
8634
8635/**
8636 * xmlXPathNameFunction:
8637 * @ctxt: the XPath Parser context
8638 * @nargs: the number of arguments
8639 *
8640 * Implement the name() XPath function
8641 * string name(node-set?)
8642 * The name function returns a string containing a QName representing
8643 * the name of the node in the argument node-set that is first in document
8644 * order. The QName must represent the name with respect to the namespace
8645 * declarations in effect on the node whose name is being represented.
8646 * Typically, this will be the form in which the name occurred in the XML
8647 * source. This need not be the case if there are namespace declarations
8648 * in effect on the node that associate multiple prefixes with the same
8649 * namespace. However, an implementation may include information about
8650 * the original prefix in its representation of nodes; in this case, an
8651 * implementation can ensure that the returned string is always the same
8652 * as the QName used in the XML source. If the argument it omitted it
8653 * defaults to the context node.
8654 * Libxml keep the original prefix so the "real qualified name" used is
8655 * returned.
8656 */
8657static void
8658xmlXPathNameFunction(xmlXPathParserContextPtr ctxt, int nargs)
8659{
8660 xmlXPathObjectPtr cur;
8661
8662 if (nargs == 0) {
8663 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
8664 ctxt->context->node));
8665 nargs = 1;
8666 }
8667
8668 CHECK_ARITY(1);
8669 if ((ctxt->value == NULL) ||
8670 ((ctxt->value->type != XPATH_NODESET) &&
8671 (ctxt->value->type != XPATH_XSLT_TREE)))
8672 XP_ERROR(XPATH_INVALID_TYPE);
8673 cur = valuePop(ctxt);
8674
8675 if ((cur->nodesetval == NULL) || (cur->nodesetval->nodeNr == 0)) {
8676 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
8677 } else {
8678 int i = 0; /* Should be first in document order !!!!! */
8679
8680 switch (cur->nodesetval->nodeTab[i]->type) {
8681 case XML_ELEMENT_NODE:
8682 case XML_ATTRIBUTE_NODE:
8683 if (cur->nodesetval->nodeTab[i]->name[0] == ' ')
8684 valuePush(ctxt,
8685 xmlXPathCacheNewCString(ctxt->context, ""));
8686 else if ((cur->nodesetval->nodeTab[i]->ns == NULL) ||
8687 (cur->nodesetval->nodeTab[i]->ns->prefix == NULL)) {
8688 valuePush(ctxt,
8689 xmlXPathCacheNewString(ctxt->context,
8690 cur->nodesetval->nodeTab[i]->name));
8691 } else {
8692 xmlChar *fullname;
8693
8694 fullname = xmlBuildQName(cur->nodesetval->nodeTab[i]->name,
8695 cur->nodesetval->nodeTab[i]->ns->prefix,
8696 NULL, 0);
8697 if (fullname == cur->nodesetval->nodeTab[i]->name)
8698 fullname = xmlStrdup(cur->nodesetval->nodeTab[i]->name);
8699 if (fullname == NULL) {
8700 XP_ERROR(XPATH_MEMORY_ERROR);
8701 }
8702 valuePush(ctxt, xmlXPathCacheWrapString(
8703 ctxt->context, fullname));
8704 }
8705 break;
8706 default:
8707 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
8708 cur->nodesetval->nodeTab[i]));
8709 xmlXPathLocalNameFunction(ctxt, 1);
8710 }
8711 }
8712 xmlXPathReleaseObject(ctxt->context, cur);
8713}
8714
8715
8716/**
8717 * xmlXPathStringFunction:
8718 * @ctxt: the XPath Parser context
8719 * @nargs: the number of arguments
8720 *
8721 * Implement the string() XPath function
8722 * string string(object?)
8723 * The string function converts an object to a string as follows:
8724 * - A node-set is converted to a string by returning the value of
8725 * the node in the node-set that is first in document order.
8726 * If the node-set is empty, an empty string is returned.
8727 * - A number is converted to a string as follows
8728 * + NaN is converted to the string NaN
8729 * + positive zero is converted to the string 0
8730 * + negative zero is converted to the string 0
8731 * + positive infinity is converted to the string Infinity
8732 * + negative infinity is converted to the string -Infinity
8733 * + if the number is an integer, the number is represented in
8734 * decimal form as a Number with no decimal point and no leading
8735 * zeros, preceded by a minus sign (-) if the number is negative
8736 * + otherwise, the number is represented in decimal form as a
8737 * Number including a decimal point with at least one digit
8738 * before the decimal point and at least one digit after the
8739 * decimal point, preceded by a minus sign (-) if the number
8740 * is negative; there must be no leading zeros before the decimal
8741 * point apart possibly from the one required digit immediately
8742 * before the decimal point; beyond the one required digit
8743 * after the decimal point there must be as many, but only as
8744 * many, more digits as are needed to uniquely distinguish the
8745 * number from all other IEEE 754 numeric values.
8746 * - The boolean false value is converted to the string false.
8747 * The boolean true value is converted to the string true.
8748 *
8749 * If the argument is omitted, it defaults to a node-set with the
8750 * context node as its only member.
8751 */
8752void
8753xmlXPathStringFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8754 xmlXPathObjectPtr cur;
8755
8756 if (ctxt == NULL) return;
8757 if (nargs == 0) {
8758 valuePush(ctxt,
8759 xmlXPathCacheWrapString(ctxt->context,
8760 xmlXPathCastNodeToString(ctxt->context->node)));
8761 return;
8762 }
8763
8764 CHECK_ARITY(1);
8765 cur = valuePop(ctxt);
8766 if (cur == NULL) XP_ERROR(XPATH_INVALID_OPERAND);
8767 valuePush(ctxt, xmlXPathCacheConvertString(ctxt->context, cur));
8768}
8769
8770/**
8771 * xmlXPathStringLengthFunction:
8772 * @ctxt: the XPath Parser context
8773 * @nargs: the number of arguments
8774 *
8775 * Implement the string-length() XPath function
8776 * number string-length(string?)
8777 * The string-length returns the number of characters in the string
8778 * (see [3.6 Strings]). If the argument is omitted, it defaults to
8779 * the context node converted to a string, in other words the value
8780 * of the context node.
8781 */
8782void
8783xmlXPathStringLengthFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8784 xmlXPathObjectPtr cur;
8785
8786 if (nargs == 0) {
8787 if ((ctxt == NULL) || (ctxt->context == NULL))
8788 return;
8789 if (ctxt->context->node == NULL) {
8790 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, 0));
8791 } else {
8792 xmlChar *content;
8793
8794 content = xmlXPathCastNodeToString(ctxt->context->node);
8795 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context,
8796 xmlUTF8Strlen(content)));
8797 xmlFree(content);
8798 }
8799 return;
8800 }
8801 CHECK_ARITY(1);
8802 CAST_TO_STRING;
8803 CHECK_TYPE(XPATH_STRING);
8804 cur = valuePop(ctxt);
8805 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context,
8806 xmlUTF8Strlen(cur->stringval)));
8807 xmlXPathReleaseObject(ctxt->context, cur);
8808}
8809
8810/**
8811 * xmlXPathConcatFunction:
8812 * @ctxt: the XPath Parser context
8813 * @nargs: the number of arguments
8814 *
8815 * Implement the concat() XPath function
8816 * string concat(string, string, string*)
8817 * The concat function returns the concatenation of its arguments.
8818 */
8819void
8820xmlXPathConcatFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8821 xmlXPathObjectPtr cur, newobj;
8822 xmlChar *tmp;
8823
8824 if (ctxt == NULL) return;
8825 if (nargs < 2) {
8826 CHECK_ARITY(2);
8827 }
8828
8829 CAST_TO_STRING;
8830 cur = valuePop(ctxt);
8831 if ((cur == NULL) || (cur->type != XPATH_STRING)) {
8832 xmlXPathReleaseObject(ctxt->context, cur);
8833 return;
8834 }
8835 nargs--;
8836
8837 while (nargs > 0) {
8838 CAST_TO_STRING;
8839 newobj = valuePop(ctxt);
8840 if ((newobj == NULL) || (newobj->type != XPATH_STRING)) {
8841 xmlXPathReleaseObject(ctxt->context, newobj);
8842 xmlXPathReleaseObject(ctxt->context, cur);
8843 XP_ERROR(XPATH_INVALID_TYPE);
8844 }
8845 tmp = xmlStrcat(newobj->stringval, cur->stringval);
8846 newobj->stringval = cur->stringval;
8847 cur->stringval = tmp;
8848 xmlXPathReleaseObject(ctxt->context, newobj);
8849 nargs--;
8850 }
8851 valuePush(ctxt, cur);
8852}
8853
8854/**
8855 * xmlXPathContainsFunction:
8856 * @ctxt: the XPath Parser context
8857 * @nargs: the number of arguments
8858 *
8859 * Implement the contains() XPath function
8860 * boolean contains(string, string)
8861 * The contains function returns true if the first argument string
8862 * contains the second argument string, and otherwise returns false.
8863 */
8864void
8865xmlXPathContainsFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8866 xmlXPathObjectPtr hay, needle;
8867
8868 CHECK_ARITY(2);
8869 CAST_TO_STRING;
8870 CHECK_TYPE(XPATH_STRING);
8871 needle = valuePop(ctxt);
8872 CAST_TO_STRING;
8873 hay = valuePop(ctxt);
8874
8875 if ((hay == NULL) || (hay->type != XPATH_STRING)) {
8876 xmlXPathReleaseObject(ctxt->context, hay);
8877 xmlXPathReleaseObject(ctxt->context, needle);
8878 XP_ERROR(XPATH_INVALID_TYPE);
8879 }
8880 if (xmlStrstr(hay->stringval, needle->stringval))
8881 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1));
8882 else
8883 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0));
8884 xmlXPathReleaseObject(ctxt->context, hay);
8885 xmlXPathReleaseObject(ctxt->context, needle);
8886}
8887
8888/**
8889 * xmlXPathStartsWithFunction:
8890 * @ctxt: the XPath Parser context
8891 * @nargs: the number of arguments
8892 *
8893 * Implement the starts-with() XPath function
8894 * boolean starts-with(string, string)
8895 * The starts-with function returns true if the first argument string
8896 * starts with the second argument string, and otherwise returns false.
8897 */
8898void
8899xmlXPathStartsWithFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8900 xmlXPathObjectPtr hay, needle;
8901 int n;
8902
8903 CHECK_ARITY(2);
8904 CAST_TO_STRING;
8905 CHECK_TYPE(XPATH_STRING);
8906 needle = valuePop(ctxt);
8907 CAST_TO_STRING;
8908 hay = valuePop(ctxt);
8909
8910 if ((hay == NULL) || (hay->type != XPATH_STRING)) {
8911 xmlXPathReleaseObject(ctxt->context, hay);
8912 xmlXPathReleaseObject(ctxt->context, needle);
8913 XP_ERROR(XPATH_INVALID_TYPE);
8914 }
8915 n = xmlStrlen(needle->stringval);
8916 if (xmlStrncmp(hay->stringval, needle->stringval, n))
8917 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0));
8918 else
8919 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1));
8920 xmlXPathReleaseObject(ctxt->context, hay);
8921 xmlXPathReleaseObject(ctxt->context, needle);
8922}
8923
8924/**
8925 * xmlXPathSubstringFunction:
8926 * @ctxt: the XPath Parser context
8927 * @nargs: the number of arguments
8928 *
8929 * Implement the substring() XPath function
8930 * string substring(string, number, number?)
8931 * The substring function returns the substring of the first argument
8932 * starting at the position specified in the second argument with
8933 * length specified in the third argument. For example,
8934 * substring("12345",2,3) returns "234". If the third argument is not
8935 * specified, it returns the substring starting at the position specified
8936 * in the second argument and continuing to the end of the string. For
8937 * example, substring("12345",2) returns "2345". More precisely, each
8938 * character in the string (see [3.6 Strings]) is considered to have a
8939 * numeric position: the position of the first character is 1, the position
8940 * of the second character is 2 and so on. The returned substring contains
8941 * those characters for which the position of the character is greater than
8942 * or equal to the second argument and, if the third argument is specified,
8943 * less than the sum of the second and third arguments; the comparisons
8944 * and addition used for the above follow the standard IEEE 754 rules. Thus:
8945 * - substring("12345", 1.5, 2.6) returns "234"
8946 * - substring("12345", 0, 3) returns "12"
8947 * - substring("12345", 0 div 0, 3) returns ""
8948 * - substring("12345", 1, 0 div 0) returns ""
8949 * - substring("12345", -42, 1 div 0) returns "12345"
8950 * - substring("12345", -1 div 0, 1 div 0) returns ""
8951 */
8952void
8953xmlXPathSubstringFunction(xmlXPathParserContextPtr ctxt, int nargs) {
8954 xmlXPathObjectPtr str, start, len;
8955 double le=0, in;
8956 int i, l, m;
8957 xmlChar *ret;
8958
8959 if (nargs < 2) {
8960 CHECK_ARITY(2);
8961 }
8962 if (nargs > 3) {
8963 CHECK_ARITY(3);
8964 }
8965 /*
8966 * take care of possible last (position) argument
8967 */
8968 if (nargs == 3) {
8969 CAST_TO_NUMBER;
8970 CHECK_TYPE(XPATH_NUMBER);
8971 len = valuePop(ctxt);
8972 le = len->floatval;
8973 xmlXPathReleaseObject(ctxt->context, len);
8974 }
8975
8976 CAST_TO_NUMBER;
8977 CHECK_TYPE(XPATH_NUMBER);
8978 start = valuePop(ctxt);
8979 in = start->floatval;
8980 xmlXPathReleaseObject(ctxt->context, start);
8981 CAST_TO_STRING;
8982 CHECK_TYPE(XPATH_STRING);
8983 str = valuePop(ctxt);
8984 m = xmlUTF8Strlen((const unsigned char *)str->stringval);
8985
8986 /*
8987 * If last pos not present, calculate last position
8988 */
8989 if (nargs != 3) {
8990 le = (double)m;
8991 if (in < 1.0)
8992 in = 1.0;
8993 }
8994
8995 /* Need to check for the special cases where either
8996 * the index is NaN, the length is NaN, or both
8997 * arguments are infinity (relying on Inf + -Inf = NaN)
8998 */
8999 if (!xmlXPathIsNaN(in + le) && !xmlXPathIsInf(in)) {
9000 /*
9001 * To meet the requirements of the spec, the arguments
9002 * must be converted to integer format before
9003 * initial index calculations are done
9004 *
9005 * First we go to integer form, rounding up
9006 * and checking for special cases
9007 */
9008 i = (int) in;
9009 if (((double)i)+0.5 <= in) i++;
9010
9011 if (xmlXPathIsInf(le) == 1) {
9012 l = m;
9013 if (i < 1)
9014 i = 1;
9015 }
9016 else if (xmlXPathIsInf(le) == -1 || le < 0.0)
9017 l = 0;
9018 else {
9019 l = (int) le;
9020 if (((double)l)+0.5 <= le) l++;
9021 }
9022
9023 /* Now we normalize inidices */
9024 i -= 1;
9025 l += i;
9026 if (i < 0)
9027 i = 0;
9028 if (l > m)
9029 l = m;
9030
9031 /* number of chars to copy */
9032 l -= i;
9033
9034 ret = xmlUTF8Strsub(str->stringval, i, l);
9035 }
9036 else {
9037 ret = NULL;
9038 }
9039 if (ret == NULL)
9040 valuePush(ctxt, xmlXPathCacheNewCString(ctxt->context, ""));
9041 else {
9042 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context, ret));
9043 xmlFree(ret);
9044 }
9045 xmlXPathReleaseObject(ctxt->context, str);
9046}
9047
9048/**
9049 * xmlXPathSubstringBeforeFunction:
9050 * @ctxt: the XPath Parser context
9051 * @nargs: the number of arguments
9052 *
9053 * Implement the substring-before() XPath function
9054 * string substring-before(string, string)
9055 * The substring-before function returns the substring of the first
9056 * argument string that precedes the first occurrence of the second
9057 * argument string in the first argument string, or the empty string
9058 * if the first argument string does not contain the second argument
9059 * string. For example, substring-before("1999/04/01","/") returns 1999.
9060 */
9061void
9062xmlXPathSubstringBeforeFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9063 xmlXPathObjectPtr str;
9064 xmlXPathObjectPtr find;
9065 xmlBufferPtr target;
9066 const xmlChar *point;
9067 int offset;
9068
9069 CHECK_ARITY(2);
9070 CAST_TO_STRING;
9071 find = valuePop(ctxt);
9072 CAST_TO_STRING;
9073 str = valuePop(ctxt);
9074
9075 target = xmlBufferCreate();
9076 if (target) {
9077 point = xmlStrstr(str->stringval, find->stringval);
9078 if (point) {
9079 offset = (int)(point - str->stringval);
9080 xmlBufferAdd(target, str->stringval, offset);
9081 }
9082 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
9083 xmlBufferContent(target)));
9084 xmlBufferFree(target);
9085 }
9086 xmlXPathReleaseObject(ctxt->context, str);
9087 xmlXPathReleaseObject(ctxt->context, find);
9088}
9089
9090/**
9091 * xmlXPathSubstringAfterFunction:
9092 * @ctxt: the XPath Parser context
9093 * @nargs: the number of arguments
9094 *
9095 * Implement the substring-after() XPath function
9096 * string substring-after(string, string)
9097 * The substring-after function returns the substring of the first
9098 * argument string that follows the first occurrence of the second
9099 * argument string in the first argument string, or the empty stringi
9100 * if the first argument string does not contain the second argument
9101 * string. For example, substring-after("1999/04/01","/") returns 04/01,
9102 * and substring-after("1999/04/01","19") returns 99/04/01.
9103 */
9104void
9105xmlXPathSubstringAfterFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9106 xmlXPathObjectPtr str;
9107 xmlXPathObjectPtr find;
9108 xmlBufferPtr target;
9109 const xmlChar *point;
9110 int offset;
9111
9112 CHECK_ARITY(2);
9113 CAST_TO_STRING;
9114 find = valuePop(ctxt);
9115 CAST_TO_STRING;
9116 str = valuePop(ctxt);
9117
9118 target = xmlBufferCreate();
9119 if (target) {
9120 point = xmlStrstr(str->stringval, find->stringval);
9121 if (point) {
9122 offset = (int)(point - str->stringval) + xmlStrlen(find->stringval);
9123 xmlBufferAdd(target, &str->stringval[offset],
9124 xmlStrlen(str->stringval) - offset);
9125 }
9126 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
9127 xmlBufferContent(target)));
9128 xmlBufferFree(target);
9129 }
9130 xmlXPathReleaseObject(ctxt->context, str);
9131 xmlXPathReleaseObject(ctxt->context, find);
9132}
9133
9134/**
9135 * xmlXPathNormalizeFunction:
9136 * @ctxt: the XPath Parser context
9137 * @nargs: the number of arguments
9138 *
9139 * Implement the normalize-space() XPath function
9140 * string normalize-space(string?)
9141 * The normalize-space function returns the argument string with white
9142 * space normalized by stripping leading and trailing whitespace
9143 * and replacing sequences of whitespace characters by a single
9144 * space. Whitespace characters are the same allowed by the S production
9145 * in XML. If the argument is omitted, it defaults to the context
9146 * node converted to a string, in other words the value of the context node.
9147 */
9148void
9149xmlXPathNormalizeFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9150 xmlXPathObjectPtr obj = NULL;
9151 xmlChar *source = NULL;
9152 xmlBufferPtr target;
9153 xmlChar blank;
9154
9155 if (ctxt == NULL) return;
9156 if (nargs == 0) {
9157 /* Use current context node */
9158 valuePush(ctxt,
9159 xmlXPathCacheWrapString(ctxt->context,
9160 xmlXPathCastNodeToString(ctxt->context->node)));
9161 nargs = 1;
9162 }
9163
9164 CHECK_ARITY(1);
9165 CAST_TO_STRING;
9166 CHECK_TYPE(XPATH_STRING);
9167 obj = valuePop(ctxt);
9168 source = obj->stringval;
9169
9170 target = xmlBufferCreate();
9171 if (target && source) {
9172
9173 /* Skip leading whitespaces */
9174 while (IS_BLANK_CH(*source))
9175 source++;
9176
9177 /* Collapse intermediate whitespaces, and skip trailing whitespaces */
9178 blank = 0;
9179 while (*source) {
9180 if (IS_BLANK_CH(*source)) {
9181 blank = 0x20;
9182 } else {
9183 if (blank) {
9184 xmlBufferAdd(target, &blank, 1);
9185 blank = 0;
9186 }
9187 xmlBufferAdd(target, source, 1);
9188 }
9189 source++;
9190 }
9191 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
9192 xmlBufferContent(target)));
9193 xmlBufferFree(target);
9194 }
9195 xmlXPathReleaseObject(ctxt->context, obj);
9196}
9197
9198/**
9199 * xmlXPathTranslateFunction:
9200 * @ctxt: the XPath Parser context
9201 * @nargs: the number of arguments
9202 *
9203 * Implement the translate() XPath function
9204 * string translate(string, string, string)
9205 * The translate function returns the first argument string with
9206 * occurrences of characters in the second argument string replaced
9207 * by the character at the corresponding position in the third argument
9208 * string. For example, translate("bar","abc","ABC") returns the string
9209 * BAr. If there is a character in the second argument string with no
9210 * character at a corresponding position in the third argument string
9211 * (because the second argument string is longer than the third argument
9212 * string), then occurrences of that character in the first argument
9213 * string are removed. For example, translate("--aaa--","abc-","ABC")
9214 * returns "AAA". If a character occurs more than once in second
9215 * argument string, then the first occurrence determines the replacement
9216 * character. If the third argument string is longer than the second
9217 * argument string, then excess characters are ignored.
9218 */
9219void
9220xmlXPathTranslateFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9221 xmlXPathObjectPtr str;
9222 xmlXPathObjectPtr from;
9223 xmlXPathObjectPtr to;
9224 xmlBufferPtr target;
9225 int offset, max;
9226 xmlChar ch;
9227 const xmlChar *point;
9228 xmlChar *cptr;
9229
9230 CHECK_ARITY(3);
9231
9232 CAST_TO_STRING;
9233 to = valuePop(ctxt);
9234 CAST_TO_STRING;
9235 from = valuePop(ctxt);
9236 CAST_TO_STRING;
9237 str = valuePop(ctxt);
9238
9239 target = xmlBufferCreate();
9240 if (target) {
9241 max = xmlUTF8Strlen(to->stringval);
9242 for (cptr = str->stringval; (ch=*cptr); ) {
9243 offset = xmlUTF8Strloc(from->stringval, cptr);
9244 if (offset >= 0) {
9245 if (offset < max) {
9246 point = xmlUTF8Strpos(to->stringval, offset);
9247 if (point)
9248 xmlBufferAdd(target, point, xmlUTF8Strsize(point, 1));
9249 }
9250 } else
9251 xmlBufferAdd(target, cptr, xmlUTF8Strsize(cptr, 1));
9252
9253 /* Step to next character in input */
9254 cptr++;
9255 if ( ch & 0x80 ) {
9256 /* if not simple ascii, verify proper format */
9257 if ( (ch & 0xc0) != 0xc0 ) {
9258 xmlGenericError(xmlGenericErrorContext,
9259 "xmlXPathTranslateFunction: Invalid UTF8 string\n");
9260 break;
9261 }
9262 /* then skip over remaining bytes for this char */
9263 while ( (ch <<= 1) & 0x80 )
9264 if ( (*cptr++ & 0xc0) != 0x80 ) {
9265 xmlGenericError(xmlGenericErrorContext,
9266 "xmlXPathTranslateFunction: Invalid UTF8 string\n");
9267 break;
9268 }
9269 if (ch & 0x80) /* must have had error encountered */
9270 break;
9271 }
9272 }
9273 }
9274 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
9275 xmlBufferContent(target)));
9276 xmlBufferFree(target);
9277 xmlXPathReleaseObject(ctxt->context, str);
9278 xmlXPathReleaseObject(ctxt->context, from);
9279 xmlXPathReleaseObject(ctxt->context, to);
9280}
9281
9282/**
9283 * xmlXPathBooleanFunction:
9284 * @ctxt: the XPath Parser context
9285 * @nargs: the number of arguments
9286 *
9287 * Implement the boolean() XPath function
9288 * boolean boolean(object)
9289 * The boolean function converts its argument to a boolean as follows:
9290 * - a number is true if and only if it is neither positive or
9291 * negative zero nor NaN
9292 * - a node-set is true if and only if it is non-empty
9293 * - a string is true if and only if its length is non-zero
9294 */
9295void
9296xmlXPathBooleanFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9297 xmlXPathObjectPtr cur;
9298
9299 CHECK_ARITY(1);
9300 cur = valuePop(ctxt);
9301 if (cur == NULL) XP_ERROR(XPATH_INVALID_OPERAND);
9302 cur = xmlXPathCacheConvertBoolean(ctxt->context, cur);
9303 valuePush(ctxt, cur);
9304}
9305
9306/**
9307 * xmlXPathNotFunction:
9308 * @ctxt: the XPath Parser context
9309 * @nargs: the number of arguments
9310 *
9311 * Implement the not() XPath function
9312 * boolean not(boolean)
9313 * The not function returns true if its argument is false,
9314 * and false otherwise.
9315 */
9316void
9317xmlXPathNotFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9318 CHECK_ARITY(1);
9319 CAST_TO_BOOLEAN;
9320 CHECK_TYPE(XPATH_BOOLEAN);
9321 ctxt->value->boolval = ! ctxt->value->boolval;
9322}
9323
9324/**
9325 * xmlXPathTrueFunction:
9326 * @ctxt: the XPath Parser context
9327 * @nargs: the number of arguments
9328 *
9329 * Implement the true() XPath function
9330 * boolean true()
9331 */
9332void
9333xmlXPathTrueFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9334 CHECK_ARITY(0);
9335 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 1));
9336}
9337
9338/**
9339 * xmlXPathFalseFunction:
9340 * @ctxt: the XPath Parser context
9341 * @nargs: the number of arguments
9342 *
9343 * Implement the false() XPath function
9344 * boolean false()
9345 */
9346void
9347xmlXPathFalseFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9348 CHECK_ARITY(0);
9349 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, 0));
9350}
9351
9352/**
9353 * xmlXPathLangFunction:
9354 * @ctxt: the XPath Parser context
9355 * @nargs: the number of arguments
9356 *
9357 * Implement the lang() XPath function
9358 * boolean lang(string)
9359 * The lang function returns true or false depending on whether the
9360 * language of the context node as specified by xml:lang attributes
9361 * is the same as or is a sublanguage of the language specified by
9362 * the argument string. The language of the context node is determined
9363 * by the value of the xml:lang attribute on the context node, or, if
9364 * the context node has no xml:lang attribute, by the value of the
9365 * xml:lang attribute on the nearest ancestor of the context node that
9366 * has an xml:lang attribute. If there is no such attribute, then lang
9367 * returns false. If there is such an attribute, then lang returns
9368 * true if the attribute value is equal to the argument ignoring case,
9369 * or if there is some suffix starting with - such that the attribute
9370 * value is equal to the argument ignoring that suffix of the attribute
9371 * value and ignoring case.
9372 */
9373void
9374xmlXPathLangFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9375 xmlXPathObjectPtr val = NULL;
9376 const xmlChar *theLang = NULL;
9377 const xmlChar *lang;
9378 int ret = 0;
9379 int i;
9380
9381 CHECK_ARITY(1);
9382 CAST_TO_STRING;
9383 CHECK_TYPE(XPATH_STRING);
9384 val = valuePop(ctxt);
9385 lang = val->stringval;
9386 theLang = xmlNodeGetLang(ctxt->context->node);
9387 if ((theLang != NULL) && (lang != NULL)) {
9388 for (i = 0;lang[i] != 0;i++)
9389 if (toupper(lang[i]) != toupper(theLang[i]))
9390 goto not_equal;
9391 if ((theLang[i] == 0) || (theLang[i] == '-'))
9392 ret = 1;
9393 }
9394not_equal:
9395 if (theLang != NULL)
9396 xmlFree((void *)theLang);
9397
9398 xmlXPathReleaseObject(ctxt->context, val);
9399 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, ret));
9400}
9401
9402/**
9403 * xmlXPathNumberFunction:
9404 * @ctxt: the XPath Parser context
9405 * @nargs: the number of arguments
9406 *
9407 * Implement the number() XPath function
9408 * number number(object?)
9409 */
9410void
9411xmlXPathNumberFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9412 xmlXPathObjectPtr cur;
9413 double res;
9414
9415 if (ctxt == NULL) return;
9416 if (nargs == 0) {
9417 if (ctxt->context->node == NULL) {
9418 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, 0.0));
9419 } else {
9420 xmlChar* content = xmlNodeGetContent(ctxt->context->node);
9421
9422 res = xmlXPathStringEvalNumber(content);
9423 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, res));
9424 xmlFree(content);
9425 }
9426 return;
9427 }
9428
9429 CHECK_ARITY(1);
9430 cur = valuePop(ctxt);
9431 valuePush(ctxt, xmlXPathCacheConvertNumber(ctxt->context, cur));
9432}
9433
9434/**
9435 * xmlXPathSumFunction:
9436 * @ctxt: the XPath Parser context
9437 * @nargs: the number of arguments
9438 *
9439 * Implement the sum() XPath function
9440 * number sum(node-set)
9441 * The sum function returns the sum of the values of the nodes in
9442 * the argument node-set.
9443 */
9444void
9445xmlXPathSumFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9446 xmlXPathObjectPtr cur;
9447 int i;
9448 double res = 0.0;
9449
9450 CHECK_ARITY(1);
9451 if ((ctxt->value == NULL) ||
9452 ((ctxt->value->type != XPATH_NODESET) &&
9453 (ctxt->value->type != XPATH_XSLT_TREE)))
9454 XP_ERROR(XPATH_INVALID_TYPE);
9455 cur = valuePop(ctxt);
9456
9457 if ((cur->nodesetval != NULL) && (cur->nodesetval->nodeNr != 0)) {
9458 for (i = 0; i < cur->nodesetval->nodeNr; i++) {
9459 res += xmlXPathCastNodeToNumber(cur->nodesetval->nodeTab[i]);
9460 }
9461 }
9462 valuePush(ctxt, xmlXPathCacheNewFloat(ctxt->context, res));
9463 xmlXPathReleaseObject(ctxt->context, cur);
9464}
9465
9466/*
9467 * To assure working code on multiple platforms, we want to only depend
9468 * upon the characteristic truncation of converting a floating point value
9469 * to an integer. Unfortunately, because of the different storage sizes
9470 * of our internal floating point value (double) and integer (int), we
9471 * can't directly convert (see bug 301162). This macro is a messy
9472 * 'workaround'
9473 */
9474#define XTRUNC(f, v) \
9475 f = fmod((v), INT_MAX); \
9476 f = (v) - (f) + (double)((int)(f));
9477
9478/**
9479 * xmlXPathFloorFunction:
9480 * @ctxt: the XPath Parser context
9481 * @nargs: the number of arguments
9482 *
9483 * Implement the floor() XPath function
9484 * number floor(number)
9485 * The floor function returns the largest (closest to positive infinity)
9486 * number that is not greater than the argument and that is an integer.
9487 */
9488void
9489xmlXPathFloorFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9490 double f;
9491
9492 CHECK_ARITY(1);
9493 CAST_TO_NUMBER;
9494 CHECK_TYPE(XPATH_NUMBER);
9495
9496 XTRUNC(f, ctxt->value->floatval);
9497 if (f != ctxt->value->floatval) {
9498 if (ctxt->value->floatval > 0)
9499 ctxt->value->floatval = f;
9500 else
9501 ctxt->value->floatval = f - 1;
9502 }
9503}
9504
9505/**
9506 * xmlXPathCeilingFunction:
9507 * @ctxt: the XPath Parser context
9508 * @nargs: the number of arguments
9509 *
9510 * Implement the ceiling() XPath function
9511 * number ceiling(number)
9512 * The ceiling function returns the smallest (closest to negative infinity)
9513 * number that is not less than the argument and that is an integer.
9514 */
9515void
9516xmlXPathCeilingFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9517 double f;
9518
9519 CHECK_ARITY(1);
9520 CAST_TO_NUMBER;
9521 CHECK_TYPE(XPATH_NUMBER);
9522
9523#if 0
9524 ctxt->value->floatval = ceil(ctxt->value->floatval);
9525#else
9526 XTRUNC(f, ctxt->value->floatval);
9527 if (f != ctxt->value->floatval) {
9528 if (ctxt->value->floatval > 0)
9529 ctxt->value->floatval = f + 1;
9530 else {
9531 if (ctxt->value->floatval < 0 && f == 0)
9532 ctxt->value->floatval = xmlXPathNZERO;
9533 else
9534 ctxt->value->floatval = f;
9535 }
9536
9537 }
9538#endif
9539}
9540
9541/**
9542 * xmlXPathRoundFunction:
9543 * @ctxt: the XPath Parser context
9544 * @nargs: the number of arguments
9545 *
9546 * Implement the round() XPath function
9547 * number round(number)
9548 * The round function returns the number that is closest to the
9549 * argument and that is an integer. If there are two such numbers,
9550 * then the one that is even is returned.
9551 */
9552void
9553xmlXPathRoundFunction(xmlXPathParserContextPtr ctxt, int nargs) {
9554 double f;
9555
9556 CHECK_ARITY(1);
9557 CAST_TO_NUMBER;
9558 CHECK_TYPE(XPATH_NUMBER);
9559
9560 if ((xmlXPathIsNaN(ctxt->value->floatval)) ||
9561 (xmlXPathIsInf(ctxt->value->floatval) == 1) ||
9562 (xmlXPathIsInf(ctxt->value->floatval) == -1) ||
9563 (ctxt->value->floatval == 0.0))
9564 return;
9565
9566 XTRUNC(f, ctxt->value->floatval);
9567 if (ctxt->value->floatval < 0) {
9568 if (ctxt->value->floatval < f - 0.5)
9569 ctxt->value->floatval = f - 1;
9570 else
9571 ctxt->value->floatval = f;
9572 if (ctxt->value->floatval == 0)
9573 ctxt->value->floatval = xmlXPathNZERO;
9574 } else {
9575 if (ctxt->value->floatval < f + 0.5)
9576 ctxt->value->floatval = f;
9577 else
9578 ctxt->value->floatval = f + 1;
9579 }
9580}
9581
9582/************************************************************************
9583 * *
9584 * The Parser *
9585 * *
9586 ************************************************************************/
9587
9588/*
9589 * a few forward declarations since we use a recursive call based
9590 * implementation.
9591 */
9592static void xmlXPathCompileExpr(xmlXPathParserContextPtr ctxt, int sort);
9593static void xmlXPathCompPredicate(xmlXPathParserContextPtr ctxt, int filter);
9594static void xmlXPathCompLocationPath(xmlXPathParserContextPtr ctxt);
9595static void xmlXPathCompRelativeLocationPath(xmlXPathParserContextPtr ctxt);
9596static xmlChar * xmlXPathParseNameComplex(xmlXPathParserContextPtr ctxt,
9597 int qualified);
9598
9599/**
9600 * xmlXPathCurrentChar:
9601 * @ctxt: the XPath parser context
9602 * @cur: pointer to the beginning of the char
9603 * @len: pointer to the length of the char read
9604 *
9605 * The current char value, if using UTF-8 this may actually span multiple
9606 * bytes in the input buffer.
9607 *
9608 * Returns the current char value and its length
9609 */
9610
9611static int
9612xmlXPathCurrentChar(xmlXPathParserContextPtr ctxt, int *len) {
9613 unsigned char c;
9614 unsigned int val;
9615 const xmlChar *cur;
9616
9617 if (ctxt == NULL)
9618 return(0);
9619 cur = ctxt->cur;
9620
9621 /*
9622 * We are supposed to handle UTF8, check it's valid
9623 * From rfc2044: encoding of the Unicode values on UTF-8:
9624 *
9625 * UCS-4 range (hex.) UTF-8 octet sequence (binary)
9626 * 0000 0000-0000 007F 0xxxxxxx
9627 * 0000 0080-0000 07FF 110xxxxx 10xxxxxx
9628 * 0000 0800-0000 FFFF 1110xxxx 10xxxxxx 10xxxxxx
9629 *
9630 * Check for the 0x110000 limit too
9631 */
9632 c = *cur;
9633 if (c & 0x80) {
9634 if ((cur[1] & 0xc0) != 0x80)
9635 goto encoding_error;
9636 if ((c & 0xe0) == 0xe0) {
9637
9638 if ((cur[2] & 0xc0) != 0x80)
9639 goto encoding_error;
9640 if ((c & 0xf0) == 0xf0) {
9641 if (((c & 0xf8) != 0xf0) ||
9642 ((cur[3] & 0xc0) != 0x80))
9643 goto encoding_error;
9644 /* 4-byte code */
9645 *len = 4;
9646 val = (cur[0] & 0x7) << 18;
9647 val |= (cur[1] & 0x3f) << 12;
9648 val |= (cur[2] & 0x3f) << 6;
9649 val |= cur[3] & 0x3f;
9650 } else {
9651 /* 3-byte code */
9652 *len = 3;
9653 val = (cur[0] & 0xf) << 12;
9654 val |= (cur[1] & 0x3f) << 6;
9655 val |= cur[2] & 0x3f;
9656 }
9657 } else {
9658 /* 2-byte code */
9659 *len = 2;
9660 val = (cur[0] & 0x1f) << 6;
9661 val |= cur[1] & 0x3f;
9662 }
9663 if (!IS_CHAR(val)) {
9664 XP_ERROR0(XPATH_INVALID_CHAR_ERROR);
9665 }
9666 return(val);
9667 } else {
9668 /* 1-byte code */
9669 *len = 1;
9670 return((int) *cur);
9671 }
9672encoding_error:
9673 /*
9674 * If we detect an UTF8 error that probably means that the
9675 * input encoding didn't get properly advertised in the
9676 * declaration header. Report the error and switch the encoding
9677 * to ISO-Latin-1 (if you don't like this policy, just declare the
9678 * encoding !)
9679 */
9680 *len = 0;
9681 XP_ERROR0(XPATH_ENCODING_ERROR);
9682}
9683
9684/**
9685 * xmlXPathParseNCName:
9686 * @ctxt: the XPath Parser context
9687 *
9688 * parse an XML namespace non qualified name.
9689 *
9690 * [NS 3] NCName ::= (Letter | '_') (NCNameChar)*
9691 *
9692 * [NS 4] NCNameChar ::= Letter | Digit | '.' | '-' | '_' |
9693 * CombiningChar | Extender
9694 *
9695 * Returns the namespace name or NULL
9696 */
9697
9698xmlChar *
9699xmlXPathParseNCName(xmlXPathParserContextPtr ctxt) {
9700 const xmlChar *in;
9701 xmlChar *ret;
9702 int count = 0;
9703
9704 if ((ctxt == NULL) || (ctxt->cur == NULL)) return(NULL);
9705 /*
9706 * Accelerator for simple ASCII names
9707 */
9708 in = ctxt->cur;
9709 if (((*in >= 0x61) && (*in <= 0x7A)) ||
9710 ((*in >= 0x41) && (*in <= 0x5A)) ||
9711 (*in == '_')) {
9712 in++;
9713 while (((*in >= 0x61) && (*in <= 0x7A)) ||
9714 ((*in >= 0x41) && (*in <= 0x5A)) ||
9715 ((*in >= 0x30) && (*in <= 0x39)) ||
9716 (*in == '_') || (*in == '.') ||
9717 (*in == '-'))
9718 in++;
9719 if ((*in == ' ') || (*in == '>') || (*in == '/') ||
9720 (*in == '[') || (*in == ']') || (*in == ':') ||
9721 (*in == '@') || (*in == '*')) {
9722 count = in - ctxt->cur;
9723 if (count == 0)
9724 return(NULL);
9725 ret = xmlStrndup(ctxt->cur, count);
9726 ctxt->cur = in;
9727 return(ret);
9728 }
9729 }
9730 return(xmlXPathParseNameComplex(ctxt, 0));
9731}
9732
9733
9734/**
9735 * xmlXPathParseQName:
9736 * @ctxt: the XPath Parser context
9737 * @prefix: a xmlChar **
9738 *
9739 * parse an XML qualified name
9740 *
9741 * [NS 5] QName ::= (Prefix ':')? LocalPart
9742 *
9743 * [NS 6] Prefix ::= NCName
9744 *
9745 * [NS 7] LocalPart ::= NCName
9746 *
9747 * Returns the function returns the local part, and prefix is updated
9748 * to get the Prefix if any.
9749 */
9750
9751static xmlChar *
9752xmlXPathParseQName(xmlXPathParserContextPtr ctxt, xmlChar **prefix) {
9753 xmlChar *ret = NULL;
9754
9755 *prefix = NULL;
9756 ret = xmlXPathParseNCName(ctxt);
9757 if (CUR == ':') {
9758 *prefix = ret;
9759 NEXT;
9760 ret = xmlXPathParseNCName(ctxt);
9761 }
9762 return(ret);
9763}
9764
9765/**
9766 * xmlXPathParseName:
9767 * @ctxt: the XPath Parser context
9768 *
9769 * parse an XML name
9770 *
9771 * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' |
9772 * CombiningChar | Extender
9773 *
9774 * [5] Name ::= (Letter | '_' | ':') (NameChar)*
9775 *
9776 * Returns the namespace name or NULL
9777 */
9778
9779xmlChar *
9780xmlXPathParseName(xmlXPathParserContextPtr ctxt) {
9781 const xmlChar *in;
9782 xmlChar *ret;
9783 int count = 0;
9784
9785 if ((ctxt == NULL) || (ctxt->cur == NULL)) return(NULL);
9786 /*
9787 * Accelerator for simple ASCII names
9788 */
9789 in = ctxt->cur;
9790 if (((*in >= 0x61) && (*in <= 0x7A)) ||
9791 ((*in >= 0x41) && (*in <= 0x5A)) ||
9792 (*in == '_') || (*in == ':')) {
9793 in++;
9794 while (((*in >= 0x61) && (*in <= 0x7A)) ||
9795 ((*in >= 0x41) && (*in <= 0x5A)) ||
9796 ((*in >= 0x30) && (*in <= 0x39)) ||
9797 (*in == '_') || (*in == '-') ||
9798 (*in == ':') || (*in == '.'))
9799 in++;
9800 if ((*in > 0) && (*in < 0x80)) {
9801 count = in - ctxt->cur;
9802 ret = xmlStrndup(ctxt->cur, count);
9803 ctxt->cur = in;
9804 return(ret);
9805 }
9806 }
9807 return(xmlXPathParseNameComplex(ctxt, 1));
9808}
9809
9810static xmlChar *
9811xmlXPathParseNameComplex(xmlXPathParserContextPtr ctxt, int qualified) {
9812 xmlChar buf[XML_MAX_NAMELEN + 5];
9813 int len = 0, l;
9814 int c;
9815
9816 /*
9817 * Handler for more complex cases
9818 */
9819 c = CUR_CHAR(l);
9820 if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
9821 (c == '[') || (c == ']') || (c == '@') || /* accelerators */
9822 (c == '*') || /* accelerators */
9823 (!IS_LETTER(c) && (c != '_') &&
9824 ((qualified) && (c != ':')))) {
9825 return(NULL);
9826 }
9827
9828 while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */
9829 ((IS_LETTER(c)) || (IS_DIGIT(c)) ||
9830 (c == '.') || (c == '-') ||
9831 (c == '_') || ((qualified) && (c == ':')) ||
9832 (IS_COMBINING(c)) ||
9833 (IS_EXTENDER(c)))) {
9834 COPY_BUF(l,buf,len,c);
9835 NEXTL(l);
9836 c = CUR_CHAR(l);
9837 if (len >= XML_MAX_NAMELEN) {
9838 /*
9839 * Okay someone managed to make a huge name, so he's ready to pay
9840 * for the processing speed.
9841 */
9842 xmlChar *buffer;
9843 int max = len * 2;
9844
9845 buffer = (xmlChar *) xmlMallocAtomic(max * sizeof(xmlChar));
9846 if (buffer == NULL) {
9847 XP_ERRORNULL(XPATH_MEMORY_ERROR);
9848 }
9849 memcpy(buffer, buf, len);
9850 while ((IS_LETTER(c)) || (IS_DIGIT(c)) || /* test bigname.xml */
9851 (c == '.') || (c == '-') ||
9852 (c == '_') || ((qualified) && (c == ':')) ||
9853 (IS_COMBINING(c)) ||
9854 (IS_EXTENDER(c))) {
9855 if (len + 10 > max) {
9856 max *= 2;
9857 buffer = (xmlChar *) xmlRealloc(buffer,
9858 max * sizeof(xmlChar));
9859 if (buffer == NULL) {
9860 XP_ERRORNULL(XPATH_MEMORY_ERROR);
9861 }
9862 }
9863 COPY_BUF(l,buffer,len,c);
9864 NEXTL(l);
9865 c = CUR_CHAR(l);
9866 }
9867 buffer[len] = 0;
9868 return(buffer);
9869 }
9870 }
9871 if (len == 0)
9872 return(NULL);
9873 return(xmlStrndup(buf, len));
9874}
9875
9876#define MAX_FRAC 20
9877
9878/*
9879 * These are used as divisors for the fractional part of a number.
9880 * Since the table includes 1.0 (representing '0' fractional digits),
9881 * it must be dimensioned at MAX_FRAC+1 (bug 133921)
9882 */
9883static double my_pow10[MAX_FRAC+1] = {
9884 1.0, 10.0, 100.0, 1000.0, 10000.0,
9885 100000.0, 1000000.0, 10000000.0, 100000000.0, 1000000000.0,
9886 10000000000.0, 100000000000.0, 1000000000000.0, 10000000000000.0,
9887 100000000000000.0,
9888 1000000000000000.0, 10000000000000000.0, 100000000000000000.0,
9889 1000000000000000000.0, 10000000000000000000.0, 100000000000000000000.0
9890};
9891
9892/**
9893 * xmlXPathStringEvalNumber:
9894 * @str: A string to scan
9895 *
9896 * [30a] Float ::= Number ('e' Digits?)?
9897 *
9898 * [30] Number ::= Digits ('.' Digits?)?
9899 * | '.' Digits
9900 * [31] Digits ::= [0-9]+
9901 *
9902 * Compile a Number in the string
9903 * In complement of the Number expression, this function also handles
9904 * negative values : '-' Number.
9905 *
9906 * Returns the double value.
9907 */
9908double
9909xmlXPathStringEvalNumber(const xmlChar *str) {
9910 const xmlChar *cur = str;
9911 double ret;
9912 int ok = 0;
9913 int isneg = 0;
9914 int exponent = 0;
9915 int is_exponent_negative = 0;
9916#ifdef __GNUC__
9917 unsigned long tmp = 0;
9918 double temp;
9919#endif
9920 if (cur == NULL) return(0);
9921 while (IS_BLANK_CH(*cur)) cur++;
9922 if ((*cur != '.') && ((*cur < '0') || (*cur > '9')) && (*cur != '-')) {
9923 return(xmlXPathNAN);
9924 }
9925 if (*cur == '-') {
9926 isneg = 1;
9927 cur++;
9928 }
9929
9930#ifdef __GNUC__
9931 /*
9932 * tmp/temp is a workaround against a gcc compiler bug
9933 * http://veillard.com/gcc.bug
9934 */
9935 ret = 0;
9936 while ((*cur >= '0') && (*cur <= '9')) {
9937 ret = ret * 10;
9938 tmp = (*cur - '0');
9939 ok = 1;
9940 cur++;
9941 temp = (double) tmp;
9942 ret = ret + temp;
9943 }
9944#else
9945 ret = 0;
9946 while ((*cur >= '0') && (*cur <= '9')) {
9947 ret = ret * 10 + (*cur - '0');
9948 ok = 1;
9949 cur++;
9950 }
9951#endif
9952
9953 if (*cur == '.') {
9954 int v, frac = 0;
9955 double fraction = 0;
9956
9957 cur++;
9958 if (((*cur < '0') || (*cur > '9')) && (!ok)) {
9959 return(xmlXPathNAN);
9960 }
9961 while (((*cur >= '0') && (*cur <= '9')) && (frac < MAX_FRAC)) {
9962 v = (*cur - '0');
9963 fraction = fraction * 10 + v;
9964 frac = frac + 1;
9965 cur++;
9966 }
9967 fraction /= my_pow10[frac];
9968 ret = ret + fraction;
9969 while ((*cur >= '0') && (*cur <= '9'))
9970 cur++;
9971 }
9972 if ((*cur == 'e') || (*cur == 'E')) {
9973 cur++;
9974 if (*cur == '-') {
9975 is_exponent_negative = 1;
9976 cur++;
9977 } else if (*cur == '+') {
9978 cur++;
9979 }
9980 while ((*cur >= '0') && (*cur <= '9')) {
9981 exponent = exponent * 10 + (*cur - '0');
9982 cur++;
9983 }
9984 }
9985 while (IS_BLANK_CH(*cur)) cur++;
9986 if (*cur != 0) return(xmlXPathNAN);
9987 if (isneg) ret = -ret;
9988 if (is_exponent_negative) exponent = -exponent;
9989 ret *= pow(10.0, (double)exponent);
9990 return(ret);
9991}
9992
9993/**
9994 * xmlXPathCompNumber:
9995 * @ctxt: the XPath Parser context
9996 *
9997 * [30] Number ::= Digits ('.' Digits?)?
9998 * | '.' Digits
9999 * [31] Digits ::= [0-9]+
10000 *
10001 * Compile a Number, then push it on the stack
10002 *
10003 */
10004static void
10005xmlXPathCompNumber(xmlXPathParserContextPtr ctxt)
10006{
10007 double ret = 0.0;
10008 double mult = 1;
10009 int ok = 0;
10010 int exponent = 0;
10011 int is_exponent_negative = 0;
10012#ifdef __GNUC__
10013 unsigned long tmp = 0;
10014 double temp;
10015#endif
10016
10017 CHECK_ERROR;
10018 if ((CUR != '.') && ((CUR < '0') || (CUR > '9'))) {
10019 XP_ERROR(XPATH_NUMBER_ERROR);
10020 }
10021#ifdef __GNUC__
10022 /*
10023 * tmp/temp is a workaround against a gcc compiler bug
10024 * http://veillard.com/gcc.bug
10025 */
10026 ret = 0;
10027 while ((CUR >= '0') && (CUR <= '9')) {
10028 ret = ret * 10;
10029 tmp = (CUR - '0');
10030 ok = 1;
10031 NEXT;
10032 temp = (double) tmp;
10033 ret = ret + temp;
10034 }
10035#else
10036 ret = 0;
10037 while ((CUR >= '0') && (CUR <= '9')) {
10038 ret = ret * 10 + (CUR - '0');
10039 ok = 1;
10040 NEXT;
10041 }
10042#endif
10043 if (CUR == '.') {
10044 NEXT;
10045 if (((CUR < '0') || (CUR > '9')) && (!ok)) {
10046 XP_ERROR(XPATH_NUMBER_ERROR);
10047 }
10048 while ((CUR >= '0') && (CUR <= '9')) {
10049 mult /= 10;
10050 ret = ret + (CUR - '0') * mult;
10051 NEXT;
10052 }
10053 }
10054 if ((CUR == 'e') || (CUR == 'E')) {
10055 NEXT;
10056 if (CUR == '-') {
10057 is_exponent_negative = 1;
10058 NEXT;
10059 } else if (CUR == '+') {
10060 NEXT;
10061 }
10062 while ((CUR >= '0') && (CUR <= '9')) {
10063 exponent = exponent * 10 + (CUR - '0');
10064 NEXT;
10065 }
10066 if (is_exponent_negative)
10067 exponent = -exponent;
10068 ret *= pow(10.0, (double) exponent);
10069 }
10070 PUSH_LONG_EXPR(XPATH_OP_VALUE, XPATH_NUMBER, 0, 0,
10071 xmlXPathCacheNewFloat(ctxt->context, ret), NULL);
10072}
10073
10074/**
10075 * xmlXPathParseLiteral:
10076 * @ctxt: the XPath Parser context
10077 *
10078 * Parse a Literal
10079 *
10080 * [29] Literal ::= '"' [^"]* '"'
10081 * | "'" [^']* "'"
10082 *
10083 * Returns the value found or NULL in case of error
10084 */
10085static xmlChar *
10086xmlXPathParseLiteral(xmlXPathParserContextPtr ctxt) {
10087 const xmlChar *q;
10088 xmlChar *ret = NULL;
10089
10090 if (CUR == '"') {
10091 NEXT;
10092 q = CUR_PTR;
10093 while ((IS_CHAR_CH(CUR)) && (CUR != '"'))
10094 NEXT;
10095 if (!IS_CHAR_CH(CUR)) {
10096 XP_ERRORNULL(XPATH_UNFINISHED_LITERAL_ERROR);
10097 } else {
10098 ret = xmlStrndup(q, CUR_PTR - q);
10099 NEXT;
10100 }
10101 } else if (CUR == '\'') {
10102 NEXT;
10103 q = CUR_PTR;
10104 while ((IS_CHAR_CH(CUR)) && (CUR != '\''))
10105 NEXT;
10106 if (!IS_CHAR_CH(CUR)) {
10107 XP_ERRORNULL(XPATH_UNFINISHED_LITERAL_ERROR);
10108 } else {
10109 ret = xmlStrndup(q, CUR_PTR - q);
10110 NEXT;
10111 }
10112 } else {
10113 XP_ERRORNULL(XPATH_START_LITERAL_ERROR);
10114 }
10115 return(ret);
10116}
10117
10118/**
10119 * xmlXPathCompLiteral:
10120 * @ctxt: the XPath Parser context
10121 *
10122 * Parse a Literal and push it on the stack.
10123 *
10124 * [29] Literal ::= '"' [^"]* '"'
10125 * | "'" [^']* "'"
10126 *
10127 * TODO: xmlXPathCompLiteral memory allocation could be improved.
10128 */
10129static void
10130xmlXPathCompLiteral(xmlXPathParserContextPtr ctxt) {
10131 const xmlChar *q;
10132 xmlChar *ret = NULL;
10133
10134 if (CUR == '"') {
10135 NEXT;
10136 q = CUR_PTR;
10137 while ((IS_CHAR_CH(CUR)) && (CUR != '"'))
10138 NEXT;
10139 if (!IS_CHAR_CH(CUR)) {
10140 XP_ERROR(XPATH_UNFINISHED_LITERAL_ERROR);
10141 } else {
10142 ret = xmlStrndup(q, CUR_PTR - q);
10143 NEXT;
10144 }
10145 } else if (CUR == '\'') {
10146 NEXT;
10147 q = CUR_PTR;
10148 while ((IS_CHAR_CH(CUR)) && (CUR != '\''))
10149 NEXT;
10150 if (!IS_CHAR_CH(CUR)) {
10151 XP_ERROR(XPATH_UNFINISHED_LITERAL_ERROR);
10152 } else {
10153 ret = xmlStrndup(q, CUR_PTR - q);
10154 NEXT;
10155 }
10156 } else {
10157 XP_ERROR(XPATH_START_LITERAL_ERROR);
10158 }
10159 if (ret == NULL) return;
10160 PUSH_LONG_EXPR(XPATH_OP_VALUE, XPATH_STRING, 0, 0,
10161 xmlXPathCacheNewString(ctxt->context, ret), NULL);
10162 xmlFree(ret);
10163}
10164
10165/**
10166 * xmlXPathCompVariableReference:
10167 * @ctxt: the XPath Parser context
10168 *
10169 * Parse a VariableReference, evaluate it and push it on the stack.
10170 *
10171 * The variable bindings consist of a mapping from variable names
10172 * to variable values. The value of a variable is an object, which can be
10173 * of any of the types that are possible for the value of an expression,
10174 * and may also be of additional types not specified here.
10175 *
10176 * Early evaluation is possible since:
10177 * The variable bindings [...] used to evaluate a subexpression are
10178 * always the same as those used to evaluate the containing expression.
10179 *
10180 * [36] VariableReference ::= '$' QName
10181 */
10182static void
10183xmlXPathCompVariableReference(xmlXPathParserContextPtr ctxt) {
10184 xmlChar *name;
10185 xmlChar *prefix;
10186
10187 SKIP_BLANKS;
10188 if (CUR != '$') {
10189 XP_ERROR(XPATH_VARIABLE_REF_ERROR);
10190 }
10191 NEXT;
10192 name = xmlXPathParseQName(ctxt, &prefix);
10193 if (name == NULL) {
10194 XP_ERROR(XPATH_VARIABLE_REF_ERROR);
10195 }
10196 ctxt->comp->last = -1;
10197 PUSH_LONG_EXPR(XPATH_OP_VARIABLE, 0, 0, 0,
10198 name, prefix);
10199 SKIP_BLANKS;
10200 if ((ctxt->context != NULL) && (ctxt->context->flags & XML_XPATH_NOVAR)) {
10201 XP_ERROR(XPATH_UNDEF_VARIABLE_ERROR);
10202 }
10203}
10204
10205/**
10206 * xmlXPathIsNodeType:
10207 * @name: a name string
10208 *
10209 * Is the name given a NodeType one.
10210 *
10211 * [38] NodeType ::= 'comment'
10212 * | 'text'
10213 * | 'processing-instruction'
10214 * | 'node'
10215 *
10216 * Returns 1 if true 0 otherwise
10217 */
10218int
10219xmlXPathIsNodeType(const xmlChar *name) {
10220 if (name == NULL)
10221 return(0);
10222
10223 if (xmlStrEqual(name, BAD_CAST "node"))
10224 return(1);
10225 if (xmlStrEqual(name, BAD_CAST "text"))
10226 return(1);
10227 if (xmlStrEqual(name, BAD_CAST "comment"))
10228 return(1);
10229 if (xmlStrEqual(name, BAD_CAST "processing-instruction"))
10230 return(1);
10231 return(0);
10232}
10233
10234/**
10235 * xmlXPathCompFunctionCall:
10236 * @ctxt: the XPath Parser context
10237 *
10238 * [16] FunctionCall ::= FunctionName '(' ( Argument ( ',' Argument)*)? ')'
10239 * [17] Argument ::= Expr
10240 *
10241 * Compile a function call, the evaluation of all arguments are
10242 * pushed on the stack
10243 */
10244static void
10245xmlXPathCompFunctionCall(xmlXPathParserContextPtr ctxt) {
10246 xmlChar *name;
10247 xmlChar *prefix;
10248 int nbargs = 0;
10249 int sort = 1;
10250
10251 name = xmlXPathParseQName(ctxt, &prefix);
10252 if (name == NULL) {
10253 XP_ERROR(XPATH_EXPR_ERROR);
10254 }
10255 SKIP_BLANKS;
10256#ifdef DEBUG_EXPR
10257 if (prefix == NULL)
10258 xmlGenericError(xmlGenericErrorContext, "Calling function %s\n",
10259 name);
10260 else
10261 xmlGenericError(xmlGenericErrorContext, "Calling function %s:%s\n",
10262 prefix, name);
10263#endif
10264
10265 if (CUR != '(') {
10266 XP_ERROR(XPATH_EXPR_ERROR);
10267 }
10268 NEXT;
10269 SKIP_BLANKS;
10270
10271 /*
10272 * Optimization for count(): we don't need the node-set to be sorted.
10273 */
10274 if ((prefix == NULL) && (name[0] == 'c') &&
10275 xmlStrEqual(name, BAD_CAST "count"))
10276 {
10277 sort = 0;
10278 }
10279 ctxt->comp->last = -1;
10280 if (CUR != ')') {
10281 while (CUR != 0) {
10282 int op1 = ctxt->comp->last;
10283 ctxt->comp->last = -1;
10284 xmlXPathCompileExpr(ctxt, sort);
10285 CHECK_ERROR;
10286 PUSH_BINARY_EXPR(XPATH_OP_ARG, op1, ctxt->comp->last, 0, 0);
10287 nbargs++;
10288 if (CUR == ')') break;
10289 if (CUR != ',') {
10290 XP_ERROR(XPATH_EXPR_ERROR);
10291 }
10292 NEXT;
10293 SKIP_BLANKS;
10294 }
10295 }
10296 PUSH_LONG_EXPR(XPATH_OP_FUNCTION, nbargs, 0, 0,
10297 name, prefix);
10298 NEXT;
10299 SKIP_BLANKS;
10300}
10301
10302/**
10303 * xmlXPathCompPrimaryExpr:
10304 * @ctxt: the XPath Parser context
10305 *
10306 * [15] PrimaryExpr ::= VariableReference
10307 * | '(' Expr ')'
10308 * | Literal
10309 * | Number
10310 * | FunctionCall
10311 *
10312 * Compile a primary expression.
10313 */
10314static void
10315xmlXPathCompPrimaryExpr(xmlXPathParserContextPtr ctxt) {
10316 SKIP_BLANKS;
10317 if (CUR == '$') xmlXPathCompVariableReference(ctxt);
10318 else if (CUR == '(') {
10319 NEXT;
10320 SKIP_BLANKS;
10321 xmlXPathCompileExpr(ctxt, 1);
10322 CHECK_ERROR;
10323 if (CUR != ')') {
10324 XP_ERROR(XPATH_EXPR_ERROR);
10325 }
10326 NEXT;
10327 SKIP_BLANKS;
10328 } else if (IS_ASCII_DIGIT(CUR) || (CUR == '.' && IS_ASCII_DIGIT(NXT(1)))) {
10329 xmlXPathCompNumber(ctxt);
10330 } else if ((CUR == '\'') || (CUR == '"')) {
10331 xmlXPathCompLiteral(ctxt);
10332 } else {
10333 xmlXPathCompFunctionCall(ctxt);
10334 }
10335 SKIP_BLANKS;
10336}
10337
10338/**
10339 * xmlXPathCompFilterExpr:
10340 * @ctxt: the XPath Parser context
10341 *
10342 * [20] FilterExpr ::= PrimaryExpr
10343 * | FilterExpr Predicate
10344 *
10345 * Compile a filter expression.
10346 * Square brackets are used to filter expressions in the same way that
10347 * they are used in location paths. It is an error if the expression to
10348 * be filtered does not evaluate to a node-set. The context node list
10349 * used for evaluating the expression in square brackets is the node-set
10350 * to be filtered listed in document order.
10351 */
10352
10353static void
10354xmlXPathCompFilterExpr(xmlXPathParserContextPtr ctxt) {
10355 xmlXPathCompPrimaryExpr(ctxt);
10356 CHECK_ERROR;
10357 SKIP_BLANKS;
10358
10359 while (CUR == '[') {
10360 xmlXPathCompPredicate(ctxt, 1);
10361 SKIP_BLANKS;
10362 }
10363
10364
10365}
10366
10367/**
10368 * xmlXPathScanName:
10369 * @ctxt: the XPath Parser context
10370 *
10371 * Trickery: parse an XML name but without consuming the input flow
10372 * Needed to avoid insanity in the parser state.
10373 *
10374 * [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':' |
10375 * CombiningChar | Extender
10376 *
10377 * [5] Name ::= (Letter | '_' | ':') (NameChar)*
10378 *
10379 * [6] Names ::= Name (S Name)*
10380 *
10381 * Returns the Name parsed or NULL
10382 */
10383
10384static xmlChar *
10385xmlXPathScanName(xmlXPathParserContextPtr ctxt) {
10386 int len = 0, l;
10387 int c;
10388 const xmlChar *cur;
10389 xmlChar *ret;
10390
10391 cur = ctxt->cur;
10392
10393 c = CUR_CHAR(l);
10394 if ((c == ' ') || (c == '>') || (c == '/') || /* accelerators */
10395 (!IS_LETTER(c) && (c != '_') &&
10396 (c != ':'))) {
10397 return(NULL);
10398 }
10399
10400 while ((c != ' ') && (c != '>') && (c != '/') && /* test bigname.xml */
10401 ((IS_LETTER(c)) || (IS_DIGIT(c)) ||
10402 (c == '.') || (c == '-') ||
10403 (c == '_') || (c == ':') ||
10404 (IS_COMBINING(c)) ||
10405 (IS_EXTENDER(c)))) {
10406 len += l;
10407 NEXTL(l);
10408 c = CUR_CHAR(l);
10409 }
10410 ret = xmlStrndup(cur, ctxt->cur - cur);
10411 ctxt->cur = cur;
10412 return(ret);
10413}
10414
10415/**
10416 * xmlXPathCompPathExpr:
10417 * @ctxt: the XPath Parser context
10418 *
10419 * [19] PathExpr ::= LocationPath
10420 * | FilterExpr
10421 * | FilterExpr '/' RelativeLocationPath
10422 * | FilterExpr '//' RelativeLocationPath
10423 *
10424 * Compile a path expression.
10425 * The / operator and // operators combine an arbitrary expression
10426 * and a relative location path. It is an error if the expression
10427 * does not evaluate to a node-set.
10428 * The / operator does composition in the same way as when / is
10429 * used in a location path. As in location paths, // is short for
10430 * /descendant-or-self::node()/.
10431 */
10432
10433static void
10434xmlXPathCompPathExpr(xmlXPathParserContextPtr ctxt) {
10435 int lc = 1; /* Should we branch to LocationPath ? */
10436 xmlChar *name = NULL; /* we may have to preparse a name to find out */
10437
10438 SKIP_BLANKS;
10439 if ((CUR == '$') || (CUR == '(') ||
10440 (IS_ASCII_DIGIT(CUR)) ||
10441 (CUR == '\'') || (CUR == '"') ||
10442 (CUR == '.' && IS_ASCII_DIGIT(NXT(1)))) {
10443 lc = 0;
10444 } else if (CUR == '*') {
10445 /* relative or absolute location path */
10446 lc = 1;
10447 } else if (CUR == '/') {
10448 /* relative or absolute location path */
10449 lc = 1;
10450 } else if (CUR == '@') {
10451 /* relative abbreviated attribute location path */
10452 lc = 1;
10453 } else if (CUR == '.') {
10454 /* relative abbreviated attribute location path */
10455 lc = 1;
10456 } else {
10457 /*
10458 * Problem is finding if we have a name here whether it's:
10459 * - a nodetype
10460 * - a function call in which case it's followed by '('
10461 * - an axis in which case it's followed by ':'
10462 * - a element name
10463 * We do an a priori analysis here rather than having to
10464 * maintain parsed token content through the recursive function
10465 * calls. This looks uglier but makes the code easier to
10466 * read/write/debug.
10467 */
10468 SKIP_BLANKS;
10469 name = xmlXPathScanName(ctxt);
10470 if ((name != NULL) && (xmlStrstr(name, (xmlChar *) "::") != NULL)) {
10471#ifdef DEBUG_STEP
10472 xmlGenericError(xmlGenericErrorContext,
10473 "PathExpr: Axis\n");
10474#endif
10475 lc = 1;
10476 xmlFree(name);
10477 } else if (name != NULL) {
10478 int len =xmlStrlen(name);
10479
10480
10481 while (NXT(len) != 0) {
10482 if (NXT(len) == '/') {
10483 /* element name */
10484#ifdef DEBUG_STEP
10485 xmlGenericError(xmlGenericErrorContext,
10486 "PathExpr: AbbrRelLocation\n");
10487#endif
10488 lc = 1;
10489 break;
10490 } else if (IS_BLANK_CH(NXT(len))) {
10491 /* ignore blanks */
10492 ;
10493 } else if (NXT(len) == ':') {
10494#ifdef DEBUG_STEP
10495 xmlGenericError(xmlGenericErrorContext,
10496 "PathExpr: AbbrRelLocation\n");
10497#endif
10498 lc = 1;
10499 break;
10500 } else if ((NXT(len) == '(')) {
10501 /* Note Type or Function */
10502 if (xmlXPathIsNodeType(name)) {
10503#ifdef DEBUG_STEP
10504 xmlGenericError(xmlGenericErrorContext,
10505 "PathExpr: Type search\n");
10506#endif
10507 lc = 1;
10508 } else {
10509#ifdef DEBUG_STEP
10510 xmlGenericError(xmlGenericErrorContext,
10511 "PathExpr: function call\n");
10512#endif
10513 lc = 0;
10514 }
10515 break;
10516 } else if ((NXT(len) == '[')) {
10517 /* element name */
10518#ifdef DEBUG_STEP
10519 xmlGenericError(xmlGenericErrorContext,
10520 "PathExpr: AbbrRelLocation\n");
10521#endif
10522 lc = 1;
10523 break;
10524 } else if ((NXT(len) == '<') || (NXT(len) == '>') ||
10525 (NXT(len) == '=')) {
10526 lc = 1;
10527 break;
10528 } else {
10529 lc = 1;
10530 break;
10531 }
10532 len++;
10533 }
10534 if (NXT(len) == 0) {
10535#ifdef DEBUG_STEP
10536 xmlGenericError(xmlGenericErrorContext,
10537 "PathExpr: AbbrRelLocation\n");
10538#endif
10539 /* element name */
10540 lc = 1;
10541 }
10542 xmlFree(name);
10543 } else {
10544 /* make sure all cases are covered explicitly */
10545 XP_ERROR(XPATH_EXPR_ERROR);
10546 }
10547 }
10548
10549 if (lc) {
10550 if (CUR == '/') {
10551 PUSH_LEAVE_EXPR(XPATH_OP_ROOT, 0, 0);
10552 } else {
10553 PUSH_LEAVE_EXPR(XPATH_OP_NODE, 0, 0);
10554 }
10555 xmlXPathCompLocationPath(ctxt);
10556 } else {
10557 xmlXPathCompFilterExpr(ctxt);
10558 CHECK_ERROR;
10559 if ((CUR == '/') && (NXT(1) == '/')) {
10560 SKIP(2);
10561 SKIP_BLANKS;
10562
10563 PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF,
10564 NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL);
10565 PUSH_UNARY_EXPR(XPATH_OP_RESET, ctxt->comp->last, 1, 0);
10566
10567 xmlXPathCompRelativeLocationPath(ctxt);
10568 } else if (CUR == '/') {
10569 xmlXPathCompRelativeLocationPath(ctxt);
10570 }
10571 }
10572 SKIP_BLANKS;
10573}
10574
10575/**
10576 * xmlXPathCompUnionExpr:
10577 * @ctxt: the XPath Parser context
10578 *
10579 * [18] UnionExpr ::= PathExpr
10580 * | UnionExpr '|' PathExpr
10581 *
10582 * Compile an union expression.
10583 */
10584
10585static void
10586xmlXPathCompUnionExpr(xmlXPathParserContextPtr ctxt) {
10587 xmlXPathCompPathExpr(ctxt);
10588 CHECK_ERROR;
10589 SKIP_BLANKS;
10590 while (CUR == '|') {
10591 int op1 = ctxt->comp->last;
10592 PUSH_LEAVE_EXPR(XPATH_OP_NODE, 0, 0);
10593
10594 NEXT;
10595 SKIP_BLANKS;
10596 xmlXPathCompPathExpr(ctxt);
10597
10598 PUSH_BINARY_EXPR(XPATH_OP_UNION, op1, ctxt->comp->last, 0, 0);
10599
10600 SKIP_BLANKS;
10601 }
10602}
10603
10604/**
10605 * xmlXPathCompUnaryExpr:
10606 * @ctxt: the XPath Parser context
10607 *
10608 * [27] UnaryExpr ::= UnionExpr
10609 * | '-' UnaryExpr
10610 *
10611 * Compile an unary expression.
10612 */
10613
10614static void
10615xmlXPathCompUnaryExpr(xmlXPathParserContextPtr ctxt) {
10616 int minus = 0;
10617 int found = 0;
10618
10619 SKIP_BLANKS;
10620 while (CUR == '-') {
10621 minus = 1 - minus;
10622 found = 1;
10623 NEXT;
10624 SKIP_BLANKS;
10625 }
10626
10627 xmlXPathCompUnionExpr(ctxt);
10628 CHECK_ERROR;
10629 if (found) {
10630 if (minus)
10631 PUSH_UNARY_EXPR(XPATH_OP_PLUS, ctxt->comp->last, 2, 0);
10632 else
10633 PUSH_UNARY_EXPR(XPATH_OP_PLUS, ctxt->comp->last, 3, 0);
10634 }
10635}
10636
10637/**
10638 * xmlXPathCompMultiplicativeExpr:
10639 * @ctxt: the XPath Parser context
10640 *
10641 * [26] MultiplicativeExpr ::= UnaryExpr
10642 * | MultiplicativeExpr MultiplyOperator UnaryExpr
10643 * | MultiplicativeExpr 'div' UnaryExpr
10644 * | MultiplicativeExpr 'mod' UnaryExpr
10645 * [34] MultiplyOperator ::= '*'
10646 *
10647 * Compile an Additive expression.
10648 */
10649
10650static void
10651xmlXPathCompMultiplicativeExpr(xmlXPathParserContextPtr ctxt) {
10652 xmlXPathCompUnaryExpr(ctxt);
10653 CHECK_ERROR;
10654 SKIP_BLANKS;
10655 while ((CUR == '*') ||
10656 ((CUR == 'd') && (NXT(1) == 'i') && (NXT(2) == 'v')) ||
10657 ((CUR == 'm') && (NXT(1) == 'o') && (NXT(2) == 'd'))) {
10658 int op = -1;
10659 int op1 = ctxt->comp->last;
10660
10661 if (CUR == '*') {
10662 op = 0;
10663 NEXT;
10664 } else if (CUR == 'd') {
10665 op = 1;
10666 SKIP(3);
10667 } else if (CUR == 'm') {
10668 op = 2;
10669 SKIP(3);
10670 }
10671 SKIP_BLANKS;
10672 xmlXPathCompUnaryExpr(ctxt);
10673 CHECK_ERROR;
10674 PUSH_BINARY_EXPR(XPATH_OP_MULT, op1, ctxt->comp->last, op, 0);
10675 SKIP_BLANKS;
10676 }
10677}
10678
10679/**
10680 * xmlXPathCompAdditiveExpr:
10681 * @ctxt: the XPath Parser context
10682 *
10683 * [25] AdditiveExpr ::= MultiplicativeExpr
10684 * | AdditiveExpr '+' MultiplicativeExpr
10685 * | AdditiveExpr '-' MultiplicativeExpr
10686 *
10687 * Compile an Additive expression.
10688 */
10689
10690static void
10691xmlXPathCompAdditiveExpr(xmlXPathParserContextPtr ctxt) {
10692
10693 xmlXPathCompMultiplicativeExpr(ctxt);
10694 CHECK_ERROR;
10695 SKIP_BLANKS;
10696 while ((CUR == '+') || (CUR == '-')) {
10697 int plus;
10698 int op1 = ctxt->comp->last;
10699
10700 if (CUR == '+') plus = 1;
10701 else plus = 0;
10702 NEXT;
10703 SKIP_BLANKS;
10704 xmlXPathCompMultiplicativeExpr(ctxt);
10705 CHECK_ERROR;
10706 PUSH_BINARY_EXPR(XPATH_OP_PLUS, op1, ctxt->comp->last, plus, 0);
10707 SKIP_BLANKS;
10708 }
10709}
10710
10711/**
10712 * xmlXPathCompRelationalExpr:
10713 * @ctxt: the XPath Parser context
10714 *
10715 * [24] RelationalExpr ::= AdditiveExpr
10716 * | RelationalExpr '<' AdditiveExpr
10717 * | RelationalExpr '>' AdditiveExpr
10718 * | RelationalExpr '<=' AdditiveExpr
10719 * | RelationalExpr '>=' AdditiveExpr
10720 *
10721 * A <= B > C is allowed ? Answer from James, yes with
10722 * (AdditiveExpr <= AdditiveExpr) > AdditiveExpr
10723 * which is basically what got implemented.
10724 *
10725 * Compile a Relational expression, then push the result
10726 * on the stack
10727 */
10728
10729static void
10730xmlXPathCompRelationalExpr(xmlXPathParserContextPtr ctxt) {
10731 xmlXPathCompAdditiveExpr(ctxt);
10732 CHECK_ERROR;
10733 SKIP_BLANKS;
10734 while ((CUR == '<') ||
10735 (CUR == '>') ||
10736 ((CUR == '<') && (NXT(1) == '=')) ||
10737 ((CUR == '>') && (NXT(1) == '='))) {
10738 int inf, strict;
10739 int op1 = ctxt->comp->last;
10740
10741 if (CUR == '<') inf = 1;
10742 else inf = 0;
10743 if (NXT(1) == '=') strict = 0;
10744 else strict = 1;
10745 NEXT;
10746 if (!strict) NEXT;
10747 SKIP_BLANKS;
10748 xmlXPathCompAdditiveExpr(ctxt);
10749 CHECK_ERROR;
10750 PUSH_BINARY_EXPR(XPATH_OP_CMP, op1, ctxt->comp->last, inf, strict);
10751 SKIP_BLANKS;
10752 }
10753}
10754
10755/**
10756 * xmlXPathCompEqualityExpr:
10757 * @ctxt: the XPath Parser context
10758 *
10759 * [23] EqualityExpr ::= RelationalExpr
10760 * | EqualityExpr '=' RelationalExpr
10761 * | EqualityExpr '!=' RelationalExpr
10762 *
10763 * A != B != C is allowed ? Answer from James, yes with
10764 * (RelationalExpr = RelationalExpr) = RelationalExpr
10765 * (RelationalExpr != RelationalExpr) != RelationalExpr
10766 * which is basically what got implemented.
10767 *
10768 * Compile an Equality expression.
10769 *
10770 */
10771static void
10772xmlXPathCompEqualityExpr(xmlXPathParserContextPtr ctxt) {
10773 xmlXPathCompRelationalExpr(ctxt);
10774 CHECK_ERROR;
10775 SKIP_BLANKS;
10776 while ((CUR == '=') || ((CUR == '!') && (NXT(1) == '='))) {
10777 int eq;
10778 int op1 = ctxt->comp->last;
10779
10780 if (CUR == '=') eq = 1;
10781 else eq = 0;
10782 NEXT;
10783 if (!eq) NEXT;
10784 SKIP_BLANKS;
10785 xmlXPathCompRelationalExpr(ctxt);
10786 CHECK_ERROR;
10787 PUSH_BINARY_EXPR(XPATH_OP_EQUAL, op1, ctxt->comp->last, eq, 0);
10788 SKIP_BLANKS;
10789 }
10790}
10791
10792/**
10793 * xmlXPathCompAndExpr:
10794 * @ctxt: the XPath Parser context
10795 *
10796 * [22] AndExpr ::= EqualityExpr
10797 * | AndExpr 'and' EqualityExpr
10798 *
10799 * Compile an AND expression.
10800 *
10801 */
10802static void
10803xmlXPathCompAndExpr(xmlXPathParserContextPtr ctxt) {
10804 xmlXPathCompEqualityExpr(ctxt);
10805 CHECK_ERROR;
10806 SKIP_BLANKS;
10807 while ((CUR == 'a') && (NXT(1) == 'n') && (NXT(2) == 'd')) {
10808 int op1 = ctxt->comp->last;
10809 SKIP(3);
10810 SKIP_BLANKS;
10811 xmlXPathCompEqualityExpr(ctxt);
10812 CHECK_ERROR;
10813 PUSH_BINARY_EXPR(XPATH_OP_AND, op1, ctxt->comp->last, 0, 0);
10814 SKIP_BLANKS;
10815 }
10816}
10817
10818/**
10819 * xmlXPathCompileExpr:
10820 * @ctxt: the XPath Parser context
10821 *
10822 * [14] Expr ::= OrExpr
10823 * [21] OrExpr ::= AndExpr
10824 * | OrExpr 'or' AndExpr
10825 *
10826 * Parse and compile an expression
10827 */
10828static void
10829xmlXPathCompileExpr(xmlXPathParserContextPtr ctxt, int sort) {
10830 xmlXPathCompAndExpr(ctxt);
10831 CHECK_ERROR;
10832 SKIP_BLANKS;
10833 while ((CUR == 'o') && (NXT(1) == 'r')) {
10834 int op1 = ctxt->comp->last;
10835 SKIP(2);
10836 SKIP_BLANKS;
10837 xmlXPathCompAndExpr(ctxt);
10838 CHECK_ERROR;
10839 PUSH_BINARY_EXPR(XPATH_OP_OR, op1, ctxt->comp->last, 0, 0);
10840 op1 = ctxt->comp->nbStep;
10841 SKIP_BLANKS;
10842 }
10843 if ((sort) && (ctxt->comp->steps[ctxt->comp->last].op != XPATH_OP_VALUE)) {
10844 /* more ops could be optimized too */
10845 /*
10846 * This is the main place to eliminate sorting for
10847 * operations which don't require a sorted node-set.
10848 * E.g. count().
10849 */
10850 PUSH_UNARY_EXPR(XPATH_OP_SORT, ctxt->comp->last , 0, 0);
10851 }
10852}
10853
10854/**
10855 * xmlXPathCompPredicate:
10856 * @ctxt: the XPath Parser context
10857 * @filter: act as a filter
10858 *
10859 * [8] Predicate ::= '[' PredicateExpr ']'
10860 * [9] PredicateExpr ::= Expr
10861 *
10862 * Compile a predicate expression
10863 */
10864static void
10865xmlXPathCompPredicate(xmlXPathParserContextPtr ctxt, int filter) {
10866 int op1 = ctxt->comp->last;
10867
10868 SKIP_BLANKS;
10869 if (CUR != '[') {
10870 XP_ERROR(XPATH_INVALID_PREDICATE_ERROR);
10871 }
10872 NEXT;
10873 SKIP_BLANKS;
10874
10875 ctxt->comp->last = -1;
10876 /*
10877 * This call to xmlXPathCompileExpr() will deactivate sorting
10878 * of the predicate result.
10879 * TODO: Sorting is still activated for filters, since I'm not
10880 * sure if needed. Normally sorting should not be needed, since
10881 * a filter can only diminish the number of items in a sequence,
10882 * but won't change its order; so if the initial sequence is sorted,
10883 * subsequent sorting is not needed.
10884 */
10885 if (! filter)
10886 xmlXPathCompileExpr(ctxt, 0);
10887 else
10888 xmlXPathCompileExpr(ctxt, 1);
10889 CHECK_ERROR;
10890
10891 if (CUR != ']') {
10892 XP_ERROR(XPATH_INVALID_PREDICATE_ERROR);
10893 }
10894
10895 if (filter)
10896 PUSH_BINARY_EXPR(XPATH_OP_FILTER, op1, ctxt->comp->last, 0, 0);
10897 else
10898 PUSH_BINARY_EXPR(XPATH_OP_PREDICATE, op1, ctxt->comp->last, 0, 0);
10899
10900 NEXT;
10901 SKIP_BLANKS;
10902}
10903
10904/**
10905 * xmlXPathCompNodeTest:
10906 * @ctxt: the XPath Parser context
10907 * @test: pointer to a xmlXPathTestVal
10908 * @type: pointer to a xmlXPathTypeVal
10909 * @prefix: placeholder for a possible name prefix
10910 *
10911 * [7] NodeTest ::= NameTest
10912 * | NodeType '(' ')'
10913 * | 'processing-instruction' '(' Literal ')'
10914 *
10915 * [37] NameTest ::= '*'
10916 * | NCName ':' '*'
10917 * | QName
10918 * [38] NodeType ::= 'comment'
10919 * | 'text'
10920 * | 'processing-instruction'
10921 * | 'node'
10922 *
10923 * Returns the name found and updates @test, @type and @prefix appropriately
10924 */
10925static xmlChar *
10926xmlXPathCompNodeTest(xmlXPathParserContextPtr ctxt, xmlXPathTestVal *test,
10927 xmlXPathTypeVal *type, const xmlChar **prefix,
10928 xmlChar *name) {
10929 int blanks;
10930
10931 if ((test == NULL) || (type == NULL) || (prefix == NULL)) {
10932 STRANGE;
10933 return(NULL);
10934 }
10935 *type = (xmlXPathTypeVal) 0;
10936 *test = (xmlXPathTestVal) 0;
10937 *prefix = NULL;
10938 SKIP_BLANKS;
10939
10940 if ((name == NULL) && (CUR == '*')) {
10941 /*
10942 * All elements
10943 */
10944 NEXT;
10945 *test = NODE_TEST_ALL;
10946 return(NULL);
10947 }
10948
10949 if (name == NULL)
10950 name = xmlXPathParseNCName(ctxt);
10951 if (name == NULL) {
10952 XP_ERRORNULL(XPATH_EXPR_ERROR);
10953 }
10954
10955 blanks = IS_BLANK_CH(CUR);
10956 SKIP_BLANKS;
10957 if (CUR == '(') {
10958 NEXT;
10959 /*
10960 * NodeType or PI search
10961 */
10962 if (xmlStrEqual(name, BAD_CAST "comment"))
10963 *type = NODE_TYPE_COMMENT;
10964 else if (xmlStrEqual(name, BAD_CAST "node"))
10965 *type = NODE_TYPE_NODE;
10966 else if (xmlStrEqual(name, BAD_CAST "processing-instruction"))
10967 *type = NODE_TYPE_PI;
10968 else if (xmlStrEqual(name, BAD_CAST "text"))
10969 *type = NODE_TYPE_TEXT;
10970 else {
10971 if (name != NULL)
10972 xmlFree(name);
10973 XP_ERRORNULL(XPATH_EXPR_ERROR);
10974 }
10975
10976 *test = NODE_TEST_TYPE;
10977
10978 SKIP_BLANKS;
10979 if (*type == NODE_TYPE_PI) {
10980 /*
10981 * Specific case: search a PI by name.
10982 */
10983 if (name != NULL)
10984 xmlFree(name);
10985 name = NULL;
10986 if (CUR != ')') {
10987 name = xmlXPathParseLiteral(ctxt);
10988 CHECK_ERROR NULL;
10989 *test = NODE_TEST_PI;
10990 SKIP_BLANKS;
10991 }
10992 }
10993 if (CUR != ')') {
10994 if (name != NULL)
10995 xmlFree(name);
10996 XP_ERRORNULL(XPATH_UNCLOSED_ERROR);
10997 }
10998 NEXT;
10999 return(name);
11000 }
11001 *test = NODE_TEST_NAME;
11002 if ((!blanks) && (CUR == ':')) {
11003 NEXT;
11004
11005 /*
11006 * Since currently the parser context don't have a
11007 * namespace list associated:
11008 * The namespace name for this prefix can be computed
11009 * only at evaluation time. The compilation is done
11010 * outside of any context.
11011 */
11012#if 0
11013 *prefix = xmlXPathNsLookup(ctxt->context, name);
11014 if (name != NULL)
11015 xmlFree(name);
11016 if (*prefix == NULL) {
11017 XP_ERROR0(XPATH_UNDEF_PREFIX_ERROR);
11018 }
11019#else
11020 *prefix = name;
11021#endif
11022
11023 if (CUR == '*') {
11024 /*
11025 * All elements
11026 */
11027 NEXT;
11028 *test = NODE_TEST_ALL;
11029 return(NULL);
11030 }
11031
11032 name = xmlXPathParseNCName(ctxt);
11033 if (name == NULL) {
11034 XP_ERRORNULL(XPATH_EXPR_ERROR);
11035 }
11036 }
11037 return(name);
11038}
11039
11040/**
11041 * xmlXPathIsAxisName:
11042 * @name: a preparsed name token
11043 *
11044 * [6] AxisName ::= 'ancestor'
11045 * | 'ancestor-or-self'
11046 * | 'attribute'
11047 * | 'child'
11048 * | 'descendant'
11049 * | 'descendant-or-self'
11050 * | 'following'
11051 * | 'following-sibling'
11052 * | 'namespace'
11053 * | 'parent'
11054 * | 'preceding'
11055 * | 'preceding-sibling'
11056 * | 'self'
11057 *
11058 * Returns the axis or 0
11059 */
11060static xmlXPathAxisVal
11061xmlXPathIsAxisName(const xmlChar *name) {
11062 xmlXPathAxisVal ret = (xmlXPathAxisVal) 0;
11063 switch (name[0]) {
11064 case 'a':
11065 if (xmlStrEqual(name, BAD_CAST "ancestor"))
11066 ret = AXIS_ANCESTOR;
11067 if (xmlStrEqual(name, BAD_CAST "ancestor-or-self"))
11068 ret = AXIS_ANCESTOR_OR_SELF;
11069 if (xmlStrEqual(name, BAD_CAST "attribute"))
11070 ret = AXIS_ATTRIBUTE;
11071 break;
11072 case 'c':
11073 if (xmlStrEqual(name, BAD_CAST "child"))
11074 ret = AXIS_CHILD;
11075 break;
11076 case 'd':
11077 if (xmlStrEqual(name, BAD_CAST "descendant"))
11078 ret = AXIS_DESCENDANT;
11079 if (xmlStrEqual(name, BAD_CAST "descendant-or-self"))
11080 ret = AXIS_DESCENDANT_OR_SELF;
11081 break;
11082 case 'f':
11083 if (xmlStrEqual(name, BAD_CAST "following"))
11084 ret = AXIS_FOLLOWING;
11085 if (xmlStrEqual(name, BAD_CAST "following-sibling"))
11086 ret = AXIS_FOLLOWING_SIBLING;
11087 break;
11088 case 'n':
11089 if (xmlStrEqual(name, BAD_CAST "namespace"))
11090 ret = AXIS_NAMESPACE;
11091 break;
11092 case 'p':
11093 if (xmlStrEqual(name, BAD_CAST "parent"))
11094 ret = AXIS_PARENT;
11095 if (xmlStrEqual(name, BAD_CAST "preceding"))
11096 ret = AXIS_PRECEDING;
11097 if (xmlStrEqual(name, BAD_CAST "preceding-sibling"))
11098 ret = AXIS_PRECEDING_SIBLING;
11099 break;
11100 case 's':
11101 if (xmlStrEqual(name, BAD_CAST "self"))
11102 ret = AXIS_SELF;
11103 break;
11104 }
11105 return(ret);
11106}
11107
11108/**
11109 * xmlXPathCompStep:
11110 * @ctxt: the XPath Parser context
11111 *
11112 * [4] Step ::= AxisSpecifier NodeTest Predicate*
11113 * | AbbreviatedStep
11114 *
11115 * [12] AbbreviatedStep ::= '.' | '..'
11116 *
11117 * [5] AxisSpecifier ::= AxisName '::'
11118 * | AbbreviatedAxisSpecifier
11119 *
11120 * [13] AbbreviatedAxisSpecifier ::= '@'?
11121 *
11122 * Modified for XPtr range support as:
11123 *
11124 * [4xptr] Step ::= AxisSpecifier NodeTest Predicate*
11125 * | AbbreviatedStep
11126 * | 'range-to' '(' Expr ')' Predicate*
11127 *
11128 * Compile one step in a Location Path
11129 * A location step of . is short for self::node(). This is
11130 * particularly useful in conjunction with //. For example, the
11131 * location path .//para is short for
11132 * self::node()/descendant-or-self::node()/child::para
11133 * and so will select all para descendant elements of the context
11134 * node.
11135 * Similarly, a location step of .. is short for parent::node().
11136 * For example, ../title is short for parent::node()/child::title
11137 * and so will select the title children of the parent of the context
11138 * node.
11139 */
11140static void
11141xmlXPathCompStep(xmlXPathParserContextPtr ctxt) {
11142#ifdef LIBXML_XPTR_ENABLED
11143 int rangeto = 0;
11144 int op2 = -1;
11145#endif
11146
11147 SKIP_BLANKS;
11148 if ((CUR == '.') && (NXT(1) == '.')) {
11149 SKIP(2);
11150 SKIP_BLANKS;
11151 PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_PARENT,
11152 NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL);
11153 } else if (CUR == '.') {
11154 NEXT;
11155 SKIP_BLANKS;
11156 } else {
11157 xmlChar *name = NULL;
11158 const xmlChar *prefix = NULL;
11159 xmlXPathTestVal test = (xmlXPathTestVal) 0;
11160 xmlXPathAxisVal axis = (xmlXPathAxisVal) 0;
11161 xmlXPathTypeVal type = (xmlXPathTypeVal) 0;
11162 int op1;
11163
11164 /*
11165 * The modification needed for XPointer change to the production
11166 */
11167#ifdef LIBXML_XPTR_ENABLED
11168 if (ctxt->xptr) {
11169 name = xmlXPathParseNCName(ctxt);
11170 if ((name != NULL) && (xmlStrEqual(name, BAD_CAST "range-to"))) {
11171 op2 = ctxt->comp->last;
11172 xmlFree(name);
11173 SKIP_BLANKS;
11174 if (CUR != '(') {
11175 XP_ERROR(XPATH_EXPR_ERROR);
11176 }
11177 NEXT;
11178 SKIP_BLANKS;
11179
11180 xmlXPathCompileExpr(ctxt, 1);
11181 /* PUSH_BINARY_EXPR(XPATH_OP_RANGETO, op2, ctxt->comp->last, 0, 0); */
11182 CHECK_ERROR;
11183
11184 SKIP_BLANKS;
11185 if (CUR != ')') {
11186 XP_ERROR(XPATH_EXPR_ERROR);
11187 }
11188 NEXT;
11189 rangeto = 1;
11190 goto eval_predicates;
11191 }
11192 }
11193#endif
11194 if (CUR == '*') {
11195 axis = AXIS_CHILD;
11196 } else {
11197 if (name == NULL)
11198 name = xmlXPathParseNCName(ctxt);
11199 if (name != NULL) {
11200 axis = xmlXPathIsAxisName(name);
11201 if (axis != 0) {
11202 SKIP_BLANKS;
11203 if ((CUR == ':') && (NXT(1) == ':')) {
11204 SKIP(2);
11205 xmlFree(name);
11206 name = NULL;
11207 } else {
11208 /* an element name can conflict with an axis one :-\ */
11209 axis = AXIS_CHILD;
11210 }
11211 } else {
11212 axis = AXIS_CHILD;
11213 }
11214 } else if (CUR == '@') {
11215 NEXT;
11216 axis = AXIS_ATTRIBUTE;
11217 } else {
11218 axis = AXIS_CHILD;
11219 }
11220 }
11221
11222 CHECK_ERROR;
11223
11224 name = xmlXPathCompNodeTest(ctxt, &test, &type, &prefix, name);
11225 if (test == 0)
11226 return;
11227
11228 if ((prefix != NULL) && (ctxt->context != NULL) &&
11229 (ctxt->context->flags & XML_XPATH_CHECKNS)) {
11230 if (xmlXPathNsLookup(ctxt->context, prefix) == NULL) {
11231 xmlXPathErr(ctxt, XPATH_UNDEF_PREFIX_ERROR);
11232 }
11233 }
11234#ifdef DEBUG_STEP
11235 xmlGenericError(xmlGenericErrorContext,
11236 "Basis : computing new set\n");
11237#endif
11238
11239#ifdef DEBUG_STEP
11240 xmlGenericError(xmlGenericErrorContext, "Basis : ");
11241 if (ctxt->value == NULL)
11242 xmlGenericError(xmlGenericErrorContext, "no value\n");
11243 else if (ctxt->value->nodesetval == NULL)
11244 xmlGenericError(xmlGenericErrorContext, "Empty\n");
11245 else
11246 xmlGenericErrorContextNodeSet(stdout, ctxt->value->nodesetval);
11247#endif
11248
11249#ifdef LIBXML_XPTR_ENABLED
11250eval_predicates:
11251#endif
11252 op1 = ctxt->comp->last;
11253 ctxt->comp->last = -1;
11254
11255 SKIP_BLANKS;
11256 while (CUR == '[') {
11257 xmlXPathCompPredicate(ctxt, 0);
11258 }
11259
11260#ifdef LIBXML_XPTR_ENABLED
11261 if (rangeto) {
11262 PUSH_BINARY_EXPR(XPATH_OP_RANGETO, op2, op1, 0, 0);
11263 } else
11264#endif
11265 PUSH_FULL_EXPR(XPATH_OP_COLLECT, op1, ctxt->comp->last, axis,
11266 test, type, (void *)prefix, (void *)name);
11267
11268 }
11269#ifdef DEBUG_STEP
11270 xmlGenericError(xmlGenericErrorContext, "Step : ");
11271 if (ctxt->value == NULL)
11272 xmlGenericError(xmlGenericErrorContext, "no value\n");
11273 else if (ctxt->value->nodesetval == NULL)
11274 xmlGenericError(xmlGenericErrorContext, "Empty\n");
11275 else
11276 xmlGenericErrorContextNodeSet(xmlGenericErrorContext,
11277 ctxt->value->nodesetval);
11278#endif
11279}
11280
11281/**
11282 * xmlXPathCompRelativeLocationPath:
11283 * @ctxt: the XPath Parser context
11284 *
11285 * [3] RelativeLocationPath ::= Step
11286 * | RelativeLocationPath '/' Step
11287 * | AbbreviatedRelativeLocationPath
11288 * [11] AbbreviatedRelativeLocationPath ::= RelativeLocationPath '//' Step
11289 *
11290 * Compile a relative location path.
11291 */
11292static void
11293xmlXPathCompRelativeLocationPath
11294(xmlXPathParserContextPtr ctxt) {
11295 SKIP_BLANKS;
11296 if ((CUR == '/') && (NXT(1) == '/')) {
11297 SKIP(2);
11298 SKIP_BLANKS;
11299 PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF,
11300 NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL);
11301 } else if (CUR == '/') {
11302 NEXT;
11303 SKIP_BLANKS;
11304 }
11305 xmlXPathCompStep(ctxt);
11306 SKIP_BLANKS;
11307 while (CUR == '/') {
11308 if ((CUR == '/') && (NXT(1) == '/')) {
11309 SKIP(2);
11310 SKIP_BLANKS;
11311 PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF,
11312 NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL);
11313 xmlXPathCompStep(ctxt);
11314 } else if (CUR == '/') {
11315 NEXT;
11316 SKIP_BLANKS;
11317 xmlXPathCompStep(ctxt);
11318 }
11319 SKIP_BLANKS;
11320 }
11321}
11322
11323/**
11324 * xmlXPathCompLocationPath:
11325 * @ctxt: the XPath Parser context
11326 *
11327 * [1] LocationPath ::= RelativeLocationPath
11328 * | AbsoluteLocationPath
11329 * [2] AbsoluteLocationPath ::= '/' RelativeLocationPath?
11330 * | AbbreviatedAbsoluteLocationPath
11331 * [10] AbbreviatedAbsoluteLocationPath ::=
11332 * '//' RelativeLocationPath
11333 *
11334 * Compile a location path
11335 *
11336 * // is short for /descendant-or-self::node()/. For example,
11337 * //para is short for /descendant-or-self::node()/child::para and
11338 * so will select any para element in the document (even a para element
11339 * that is a document element will be selected by //para since the
11340 * document element node is a child of the root node); div//para is
11341 * short for div/descendant-or-self::node()/child::para and so will
11342 * select all para descendants of div children.
11343 */
11344static void
11345xmlXPathCompLocationPath(xmlXPathParserContextPtr ctxt) {
11346 SKIP_BLANKS;
11347 if (CUR != '/') {
11348 xmlXPathCompRelativeLocationPath(ctxt);
11349 } else {
11350 while (CUR == '/') {
11351 if ((CUR == '/') && (NXT(1) == '/')) {
11352 SKIP(2);
11353 SKIP_BLANKS;
11354 PUSH_LONG_EXPR(XPATH_OP_COLLECT, AXIS_DESCENDANT_OR_SELF,
11355 NODE_TEST_TYPE, NODE_TYPE_NODE, NULL, NULL);
11356 xmlXPathCompRelativeLocationPath(ctxt);
11357 } else if (CUR == '/') {
11358 NEXT;
11359 SKIP_BLANKS;
11360 if ((CUR != 0 ) &&
11361 ((IS_ASCII_LETTER(CUR)) || (CUR == '_') || (CUR == '.') ||
11362 (CUR == '@') || (CUR == '*')))
11363 xmlXPathCompRelativeLocationPath(ctxt);
11364 }
11365 }
11366 }
11367}
11368
11369/************************************************************************
11370 * *
11371 * XPath precompiled expression evaluation *
11372 * *
11373 ************************************************************************/
11374
11375static int
11376xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op);
11377
11378#ifdef DEBUG_STEP
11379static void
11380xmlXPathDebugDumpStepAxis(xmlXPathAxisVal axis,
11381 xmlXPathTestVal test,
11382 int nbNodes)
11383{
11384 xmlGenericError(xmlGenericErrorContext, "new step : ");
11385 switch (axis) {
11386 case AXIS_ANCESTOR:
11387 xmlGenericError(xmlGenericErrorContext, "axis 'ancestors' ");
11388 break;
11389 case AXIS_ANCESTOR_OR_SELF:
11390 xmlGenericError(xmlGenericErrorContext,
11391 "axis 'ancestors-or-self' ");
11392 break;
11393 case AXIS_ATTRIBUTE:
11394 xmlGenericError(xmlGenericErrorContext, "axis 'attributes' ");
11395 break;
11396 case AXIS_CHILD:
11397 xmlGenericError(xmlGenericErrorContext, "axis 'child' ");
11398 break;
11399 case AXIS_DESCENDANT:
11400 xmlGenericError(xmlGenericErrorContext, "axis 'descendant' ");
11401 break;
11402 case AXIS_DESCENDANT_OR_SELF:
11403 xmlGenericError(xmlGenericErrorContext,
11404 "axis 'descendant-or-self' ");
11405 break;
11406 case AXIS_FOLLOWING:
11407 xmlGenericError(xmlGenericErrorContext, "axis 'following' ");
11408 break;
11409 case AXIS_FOLLOWING_SIBLING:
11410 xmlGenericError(xmlGenericErrorContext,
11411 "axis 'following-siblings' ");
11412 break;
11413 case AXIS_NAMESPACE:
11414 xmlGenericError(xmlGenericErrorContext, "axis 'namespace' ");
11415 break;
11416 case AXIS_PARENT:
11417 xmlGenericError(xmlGenericErrorContext, "axis 'parent' ");
11418 break;
11419 case AXIS_PRECEDING:
11420 xmlGenericError(xmlGenericErrorContext, "axis 'preceding' ");
11421 break;
11422 case AXIS_PRECEDING_SIBLING:
11423 xmlGenericError(xmlGenericErrorContext,
11424 "axis 'preceding-sibling' ");
11425 break;
11426 case AXIS_SELF:
11427 xmlGenericError(xmlGenericErrorContext, "axis 'self' ");
11428 break;
11429 }
11430 xmlGenericError(xmlGenericErrorContext,
11431 " context contains %d nodes\n", nbNodes);
11432 switch (test) {
11433 case NODE_TEST_NONE:
11434 xmlGenericError(xmlGenericErrorContext,
11435 " searching for none !!!\n");
11436 break;
11437 case NODE_TEST_TYPE:
11438 xmlGenericError(xmlGenericErrorContext,
11439 " searching for type %d\n", type);
11440 break;
11441 case NODE_TEST_PI:
11442 xmlGenericError(xmlGenericErrorContext,
11443 " searching for PI !!!\n");
11444 break;
11445 case NODE_TEST_ALL:
11446 xmlGenericError(xmlGenericErrorContext,
11447 " searching for *\n");
11448 break;
11449 case NODE_TEST_NS:
11450 xmlGenericError(xmlGenericErrorContext,
11451 " searching for namespace %s\n",
11452 prefix);
11453 break;
11454 case NODE_TEST_NAME:
11455 xmlGenericError(xmlGenericErrorContext,
11456 " searching for name %s\n", name);
11457 if (prefix != NULL)
11458 xmlGenericError(xmlGenericErrorContext,
11459 " with namespace %s\n", prefix);
11460 break;
11461 }
11462 xmlGenericError(xmlGenericErrorContext, "Testing : ");
11463}
11464#endif /* DEBUG_STEP */
11465
11466static int
11467xmlXPathCompOpEvalPredicate(xmlXPathParserContextPtr ctxt,
11468 xmlXPathStepOpPtr op,
11469 xmlNodeSetPtr set,
11470 int contextSize,
11471 int hasNsNodes)
11472{
11473 if (op->ch1 != -1) {
11474 xmlXPathCompExprPtr comp = ctxt->comp;
11475 /*
11476 * Process inner predicates first.
11477 */
11478 if (comp->steps[op->ch1].op != XPATH_OP_PREDICATE) {
11479 /*
11480 * TODO: raise an internal error.
11481 */
11482 }
11483 contextSize = xmlXPathCompOpEvalPredicate(ctxt,
11484 &comp->steps[op->ch1], set, contextSize, hasNsNodes);
11485 CHECK_ERROR0;
11486 if (contextSize <= 0)
11487 return(0);
11488 }
11489 if (op->ch2 != -1) {
11490 xmlXPathContextPtr xpctxt = ctxt->context;
11491 xmlNodePtr contextNode, oldContextNode;
11492 xmlDocPtr oldContextDoc;
11493 int i, res, contextPos = 0, newContextSize;
11494 xmlXPathStepOpPtr exprOp;
11495 xmlXPathObjectPtr contextObj = NULL, exprRes = NULL;
11496
11497#ifdef LIBXML_XPTR_ENABLED
11498 /*
11499 * URGENT TODO: Check the following:
11500 * We don't expect location sets if evaluating prediates, right?
11501 * Only filters should expect location sets, right?
11502 */
11503#endif
11504 /*
11505 * SPEC XPath 1.0:
11506 * "For each node in the node-set to be filtered, the
11507 * PredicateExpr is evaluated with that node as the
11508 * context node, with the number of nodes in the
11509 * node-set as the context size, and with the proximity
11510 * position of the node in the node-set with respect to
11511 * the axis as the context position;"
11512 * @oldset is the node-set" to be filtered.
11513 *
11514 * SPEC XPath 1.0:
11515 * "only predicates change the context position and
11516 * context size (see [2.4 Predicates])."
11517 * Example:
11518 * node-set context pos
11519 * nA 1
11520 * nB 2
11521 * nC 3
11522 * After applying predicate [position() > 1] :
11523 * node-set context pos
11524 * nB 1
11525 * nC 2
11526 */
11527 oldContextNode = xpctxt->node;
11528 oldContextDoc = xpctxt->doc;
11529 /*
11530 * Get the expression of this predicate.
11531 */
11532 exprOp = &ctxt->comp->steps[op->ch2];
11533 newContextSize = 0;
11534 for (i = 0; i < set->nodeNr; i++) {
11535 if (set->nodeTab[i] == NULL)
11536 continue;
11537
11538 contextNode = set->nodeTab[i];
11539 xpctxt->node = contextNode;
11540 xpctxt->contextSize = contextSize;
11541 xpctxt->proximityPosition = ++contextPos;
11542
11543 /*
11544 * Also set the xpath document in case things like
11545 * key() are evaluated in the predicate.
11546 */
11547 if ((contextNode->type != XML_NAMESPACE_DECL) &&
11548 (contextNode->doc != NULL))
11549 xpctxt->doc = contextNode->doc;
11550 /*
11551 * Evaluate the predicate expression with 1 context node
11552 * at a time; this node is packaged into a node set; this
11553 * node set is handed over to the evaluation mechanism.
11554 */
11555 if (contextObj == NULL)
11556 contextObj = xmlXPathCacheNewNodeSet(xpctxt, contextNode);
11557 else
11558 xmlXPathNodeSetAddUnique(contextObj->nodesetval,
11559 contextNode);
11560
11561 valuePush(ctxt, contextObj);
11562
11563 res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1);
11564
11565 if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) {
11566 xmlXPathNodeSetClear(set, hasNsNodes);
11567 newContextSize = 0;
11568 goto evaluation_exit;
11569 }
11570
11571 if (res != 0) {
11572 newContextSize++;
11573 } else {
11574 /*
11575 * Remove the entry from the initial node set.
11576 */
11577 set->nodeTab[i] = NULL;
11578 if (contextNode->type == XML_NAMESPACE_DECL)
11579 xmlXPathNodeSetFreeNs((xmlNsPtr) contextNode);
11580 }
11581 if (ctxt->value == contextObj) {
11582 /*
11583 * Don't free the temporary XPath object holding the
11584 * context node, in order to avoid massive recreation
11585 * inside this loop.
11586 */
11587 valuePop(ctxt);
11588 xmlXPathNodeSetClear(contextObj->nodesetval, hasNsNodes);
11589 } else {
11590 /*
11591 * TODO: The object was lost in the evaluation machinery.
11592 * Can this happen? Maybe in internal-error cases.
11593 */
11594 contextObj = NULL;
11595 }
11596 }
11597
11598 if (contextObj != NULL) {
11599 if (ctxt->value == contextObj)
11600 valuePop(ctxt);
11601 xmlXPathReleaseObject(xpctxt, contextObj);
11602 }
11603evaluation_exit:
11604 if (exprRes != NULL)
11605 xmlXPathReleaseObject(ctxt->context, exprRes);
11606 /*
11607 * Reset/invalidate the context.
11608 */
11609 xpctxt->node = oldContextNode;
11610 xpctxt->doc = oldContextDoc;
11611 xpctxt->contextSize = -1;
11612 xpctxt->proximityPosition = -1;
11613 return(newContextSize);
11614 }
11615 return(contextSize);
11616}
11617
11618static int
11619xmlXPathCompOpEvalPositionalPredicate(xmlXPathParserContextPtr ctxt,
11620 xmlXPathStepOpPtr op,
11621 xmlNodeSetPtr set,
11622 int contextSize,
11623 int minPos,
11624 int maxPos,
11625 int hasNsNodes)
11626{
11627 if (op->ch1 != -1) {
11628 xmlXPathCompExprPtr comp = ctxt->comp;
11629 if (comp->steps[op->ch1].op != XPATH_OP_PREDICATE) {
11630 /*
11631 * TODO: raise an internal error.
11632 */
11633 }
11634 contextSize = xmlXPathCompOpEvalPredicate(ctxt,
11635 &comp->steps[op->ch1], set, contextSize, hasNsNodes);
11636 CHECK_ERROR0;
11637 if (contextSize <= 0)
11638 return(0);
11639 }
11640 /*
11641 * Check if the node set contains a sufficient number of nodes for
11642 * the requested range.
11643 */
11644 if (contextSize < minPos) {
11645 xmlXPathNodeSetClear(set, hasNsNodes);
11646 return(0);
11647 }
11648 if (op->ch2 == -1) {
11649 /*
11650 * TODO: Can this ever happen?
11651 */
11652 return (contextSize);
11653 } else {
11654 xmlDocPtr oldContextDoc;
11655 int i, pos = 0, newContextSize = 0, contextPos = 0, res;
11656 xmlXPathStepOpPtr exprOp;
11657 xmlXPathObjectPtr contextObj = NULL, exprRes = NULL;
11658 xmlNodePtr oldContextNode, contextNode = NULL;
11659 xmlXPathContextPtr xpctxt = ctxt->context;
11660
11661#ifdef LIBXML_XPTR_ENABLED
11662 /*
11663 * URGENT TODO: Check the following:
11664 * We don't expect location sets if evaluating prediates, right?
11665 * Only filters should expect location sets, right?
11666 */
11667#endif /* LIBXML_XPTR_ENABLED */
11668
11669 /*
11670 * Save old context.
11671 */
11672 oldContextNode = xpctxt->node;
11673 oldContextDoc = xpctxt->doc;
11674 /*
11675 * Get the expression of this predicate.
11676 */
11677 exprOp = &ctxt->comp->steps[op->ch2];
11678 for (i = 0; i < set->nodeNr; i++) {
11679 if (set->nodeTab[i] == NULL)
11680 continue;
11681
11682 contextNode = set->nodeTab[i];
11683 xpctxt->node = contextNode;
11684 xpctxt->contextSize = contextSize;
11685 xpctxt->proximityPosition = ++contextPos;
11686
11687 /*
11688 * Initialize the new set.
11689 * Also set the xpath document in case things like
11690 * key() evaluation are attempted on the predicate
11691 */
11692 if ((contextNode->type != XML_NAMESPACE_DECL) &&
11693 (contextNode->doc != NULL))
11694 xpctxt->doc = contextNode->doc;
11695 /*
11696 * Evaluate the predicate expression with 1 context node
11697 * at a time; this node is packaged into a node set; this
11698 * node set is handed over to the evaluation mechanism.
11699 */
11700 if (contextObj == NULL)
11701 contextObj = xmlXPathCacheNewNodeSet(xpctxt, contextNode);
11702 else
11703 xmlXPathNodeSetAddUnique(contextObj->nodesetval,
11704 contextNode);
11705
11706 valuePush(ctxt, contextObj);
11707 res = xmlXPathCompOpEvalToBoolean(ctxt, exprOp, 1);
11708
11709 if ((ctxt->error != XPATH_EXPRESSION_OK) || (res == -1)) {
11710 xmlXPathObjectPtr tmp;
11711 /* pop the result */
11712 tmp = valuePop(ctxt);
11713 xmlXPathReleaseObject(xpctxt, tmp);
11714 /* then pop off contextObj, which will be freed later */
11715 valuePop(ctxt);
11716 goto evaluation_error;
11717 }
11718
11719 if (res)
11720 pos++;
11721
11722 if (res && (pos >= minPos) && (pos <= maxPos)) {
11723 /*
11724 * Fits in the requested range.
11725 */
11726 newContextSize++;
11727 if (minPos == maxPos) {
11728 /*
11729 * Only 1 node was requested.
11730 */
11731 if (contextNode->type == XML_NAMESPACE_DECL) {
11732 /*
11733 * As always: take care of those nasty
11734 * namespace nodes.
11735 */
11736 set->nodeTab[i] = NULL;
11737 }
11738 xmlXPathNodeSetClear(set, hasNsNodes);
11739 set->nodeNr = 1;
11740 set->nodeTab[0] = contextNode;
11741 goto evaluation_exit;
11742 }
11743 if (pos == maxPos) {
11744 /*
11745 * We are done.
11746 */
11747 xmlXPathNodeSetClearFromPos(set, i +1, hasNsNodes);
11748 goto evaluation_exit;
11749 }
11750 } else {
11751 /*
11752 * Remove the entry from the initial node set.
11753 */
11754 set->nodeTab[i] = NULL;
11755 if (contextNode->type == XML_NAMESPACE_DECL)
11756 xmlXPathNodeSetFreeNs((xmlNsPtr) contextNode);
11757 }
11758 if (exprRes != NULL) {
11759 xmlXPathReleaseObject(ctxt->context, exprRes);
11760 exprRes = NULL;
11761 }
11762 if (ctxt->value == contextObj) {
11763 /*
11764 * Don't free the temporary XPath object holding the
11765 * context node, in order to avoid massive recreation
11766 * inside this loop.
11767 */
11768 valuePop(ctxt);
11769 xmlXPathNodeSetClear(contextObj->nodesetval, hasNsNodes);
11770 } else {
11771 /*
11772 * The object was lost in the evaluation machinery.
11773 * Can this happen? Maybe in case of internal-errors.
11774 */
11775 contextObj = NULL;
11776 }
11777 }
11778 goto evaluation_exit;
11779
11780evaluation_error:
11781 xmlXPathNodeSetClear(set, hasNsNodes);
11782 newContextSize = 0;
11783
11784evaluation_exit:
11785 if (contextObj != NULL) {
11786 if (ctxt->value == contextObj)
11787 valuePop(ctxt);
11788 xmlXPathReleaseObject(xpctxt, contextObj);
11789 }
11790 if (exprRes != NULL)
11791 xmlXPathReleaseObject(ctxt->context, exprRes);
11792 /*
11793 * Reset/invalidate the context.
11794 */
11795 xpctxt->node = oldContextNode;
11796 xpctxt->doc = oldContextDoc;
11797 xpctxt->contextSize = -1;
11798 xpctxt->proximityPosition = -1;
11799 return(newContextSize);
11800 }
11801 return(contextSize);
11802}
11803
11804static int
11805xmlXPathIsPositionalPredicate(xmlXPathParserContextPtr ctxt,
11806 xmlXPathStepOpPtr op,
11807 int *maxPos)
11808{
11809
11810 xmlXPathStepOpPtr exprOp;
11811
11812 /*
11813 * BIG NOTE: This is not intended for XPATH_OP_FILTER yet!
11814 */
11815
11816 /*
11817 * If not -1, then ch1 will point to:
11818 * 1) For predicates (XPATH_OP_PREDICATE):
11819 * - an inner predicate operator
11820 * 2) For filters (XPATH_OP_FILTER):
11821 * - an inner filter operater OR
11822 * - an expression selecting the node set.
11823 * E.g. "key('a', 'b')" or "(//foo | //bar)".
11824 */
11825 if ((op->op != XPATH_OP_PREDICATE) && (op->op != XPATH_OP_FILTER))
11826 return(0);
11827
11828 if (op->ch2 != -1) {
11829 exprOp = &ctxt->comp->steps[op->ch2];
11830 } else
11831 return(0);
11832
11833 if ((exprOp != NULL) &&
11834 (exprOp->op == XPATH_OP_VALUE) &&
11835 (exprOp->value4 != NULL) &&
11836 (((xmlXPathObjectPtr) exprOp->value4)->type == XPATH_NUMBER))
11837 {
11838 /*
11839 * We have a "[n]" predicate here.
11840 * TODO: Unfortunately this simplistic test here is not
11841 * able to detect a position() predicate in compound
11842 * expressions like "[@attr = 'a" and position() = 1],
11843 * and even not the usage of position() in
11844 * "[position() = 1]"; thus - obviously - a position-range,
11845 * like it "[position() < 5]", is also not detected.
11846 * Maybe we could rewrite the AST to ease the optimization.
11847 */
11848 *maxPos = (int) ((xmlXPathObjectPtr) exprOp->value4)->floatval;
11849
11850 if (((xmlXPathObjectPtr) exprOp->value4)->floatval ==
11851 (float) *maxPos)
11852 {
11853 return(1);
11854 }
11855 }
11856 return(0);
11857}
11858
11859static int
11860xmlXPathNodeCollectAndTest(xmlXPathParserContextPtr ctxt,
11861 xmlXPathStepOpPtr op,
11862 xmlNodePtr * first, xmlNodePtr * last,
11863 int toBool)
11864{
11865
11866#define XP_TEST_HIT \
11867 if (hasAxisRange != 0) { \
11868 if (++pos == maxPos) { \
11869 addNode(seq, cur); \
11870 goto axis_range_end; } \
11871 } else { \
11872 addNode(seq, cur); \
11873 if (breakOnFirstHit) goto first_hit; }
11874
11875#define XP_TEST_HIT_NS \
11876 if (hasAxisRange != 0) { \
11877 if (++pos == maxPos) { \
11878 hasNsNodes = 1; \
11879 xmlXPathNodeSetAddNs(seq, xpctxt->node, (xmlNsPtr) cur); \
11880 goto axis_range_end; } \
11881 } else { \
11882 hasNsNodes = 1; \
11883 xmlXPathNodeSetAddNs(seq, \
11884 xpctxt->node, (xmlNsPtr) cur); \
11885 if (breakOnFirstHit) goto first_hit; }
11886
11887 xmlXPathAxisVal axis = (xmlXPathAxisVal) op->value;
11888 xmlXPathTestVal test = (xmlXPathTestVal) op->value2;
11889 xmlXPathTypeVal type = (xmlXPathTypeVal) op->value3;
11890 const xmlChar *prefix = op->value4;
11891 const xmlChar *name = op->value5;
11892 const xmlChar *URI = NULL;
11893
11894#ifdef DEBUG_STEP
11895 int nbMatches = 0, prevMatches = 0;
11896#endif
11897 int total = 0, hasNsNodes = 0;
11898 /* The popped object holding the context nodes */
11899 xmlXPathObjectPtr obj;
11900 /* The set of context nodes for the node tests */
11901 xmlNodeSetPtr contextSeq;
11902 int contextIdx;
11903 xmlNodePtr contextNode;
11904 /* The context node for a compound traversal */
11905 xmlNodePtr outerContextNode;
11906 /* The final resulting node set wrt to all context nodes */
11907 xmlNodeSetPtr outSeq;
11908 /*
11909 * The temporary resulting node set wrt 1 context node.
11910 * Used to feed predicate evaluation.
11911 */
11912 xmlNodeSetPtr seq;
11913 xmlNodePtr cur;
11914 /* First predicate operator */
11915 xmlXPathStepOpPtr predOp;
11916 int maxPos; /* The requested position() (when a "[n]" predicate) */
11917 int hasPredicateRange, hasAxisRange, pos, size, newSize;
11918 int breakOnFirstHit;
11919
11920 xmlXPathTraversalFunction next = NULL;
11921 /* compound axis traversal */
11922 xmlXPathTraversalFunctionExt outerNext = NULL;
11923 void (*addNode) (xmlNodeSetPtr, xmlNodePtr);
11924 xmlXPathNodeSetMergeFunction mergeAndClear;
11925 xmlNodePtr oldContextNode;
11926 xmlXPathContextPtr xpctxt = ctxt->context;
11927
11928
11929 CHECK_TYPE0(XPATH_NODESET);
11930 obj = valuePop(ctxt);
11931 /*
11932 * Setup namespaces.
11933 */
11934 if (prefix != NULL) {
11935 URI = xmlXPathNsLookup(xpctxt, prefix);
11936 if (URI == NULL) {
11937 xmlXPathReleaseObject(xpctxt, obj);
11938 XP_ERROR0(XPATH_UNDEF_PREFIX_ERROR);
11939 }
11940 }
11941 /*
11942 * Setup axis.
11943 *
11944 * MAYBE FUTURE TODO: merging optimizations:
11945 * - If the nodes to be traversed wrt to the initial nodes and
11946 * the current axis cannot overlap, then we could avoid searching
11947 * for duplicates during the merge.
11948 * But the question is how/when to evaluate if they cannot overlap.
11949 * Example: if we know that for two initial nodes, the one is
11950 * not in the ancestor-or-self axis of the other, then we could safely
11951 * avoid a duplicate-aware merge, if the axis to be traversed is e.g.
11952 * the descendant-or-self axis.
11953 */
11954 addNode = xmlXPathNodeSetAdd;
11955 mergeAndClear = xmlXPathNodeSetMergeAndClear;
11956 switch (axis) {
11957 case AXIS_ANCESTOR:
11958 first = NULL;
11959 next = xmlXPathNextAncestor;
11960 break;
11961 case AXIS_ANCESTOR_OR_SELF:
11962 first = NULL;
11963 next = xmlXPathNextAncestorOrSelf;
11964 break;
11965 case AXIS_ATTRIBUTE:
11966 first = NULL;
11967 last = NULL;
11968 next = xmlXPathNextAttribute;
11969 mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls;
11970 break;
11971 case AXIS_CHILD:
11972 last = NULL;
11973 if (op->rewriteType == XP_REWRITE_DOS_CHILD_ELEM) {
11974 /*
11975 * This iterator will give us only nodes which can
11976 * hold element nodes.
11977 */
11978 outerNext = xmlXPathNextDescendantOrSelfElemParent;
11979 }
11980 if (((test == NODE_TEST_NAME) || (test == NODE_TEST_ALL)) &&
11981 (type == NODE_TYPE_NODE))
11982 {
11983 /*
11984 * Optimization if an element node type is 'element'.
11985 */
11986 next = xmlXPathNextChildElement;
11987 } else
11988 next = xmlXPathNextChild;
11989 mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls;
11990 break;
11991 case AXIS_DESCENDANT:
11992 last = NULL;
11993 next = xmlXPathNextDescendant;
11994 break;
11995 case AXIS_DESCENDANT_OR_SELF:
11996 last = NULL;
11997 next = xmlXPathNextDescendantOrSelf;
11998 break;
11999 case AXIS_FOLLOWING:
12000 last = NULL;
12001 next = xmlXPathNextFollowing;
12002 break;
12003 case AXIS_FOLLOWING_SIBLING:
12004 last = NULL;
12005 next = xmlXPathNextFollowingSibling;
12006 break;
12007 case AXIS_NAMESPACE:
12008 first = NULL;
12009 last = NULL;
12010 next = (xmlXPathTraversalFunction) xmlXPathNextNamespace;
12011 mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls;
12012 break;
12013 case AXIS_PARENT:
12014 first = NULL;
12015 next = xmlXPathNextParent;
12016 break;
12017 case AXIS_PRECEDING:
12018 first = NULL;
12019 next = xmlXPathNextPrecedingInternal;
12020 break;
12021 case AXIS_PRECEDING_SIBLING:
12022 first = NULL;
12023 next = xmlXPathNextPrecedingSibling;
12024 break;
12025 case AXIS_SELF:
12026 first = NULL;
12027 last = NULL;
12028 next = xmlXPathNextSelf;
12029 mergeAndClear = xmlXPathNodeSetMergeAndClearNoDupls;
12030 break;
12031 }
12032
12033#ifdef DEBUG_STEP
12034 xmlXPathDebugDumpStepAxis(axis, test,
12035 (obj->nodesetval != NULL) ? obj->nodsetval->nodeNr : 0);
12036#endif
12037
12038 if (next == NULL) {
12039 xmlXPathReleaseObject(xpctxt, obj);
12040 return(0);
12041 }
12042 contextSeq = obj->nodesetval;
12043 if ((contextSeq == NULL) || (contextSeq->nodeNr <= 0)) {
12044 xmlXPathReleaseObject(xpctxt, obj);
12045 valuePush(ctxt, xmlXPathCacheWrapNodeSet(xpctxt, NULL));
12046 return(0);
12047 }
12048 /*
12049 * Predicate optimization ---------------------------------------------
12050 * If this step has a last predicate, which contains a position(),
12051 * then we'll optimize (although not exactly "position()", but only
12052 * the short-hand form, i.e., "[n]".
12053 *
12054 * Example - expression "/foo[parent::bar][1]":
12055 *
12056 * COLLECT 'child' 'name' 'node' foo -- op (we are here)
12057 * ROOT -- op->ch1
12058 * PREDICATE -- op->ch2 (predOp)
12059 * PREDICATE -- predOp->ch1 = [parent::bar]
12060 * SORT
12061 * COLLECT 'parent' 'name' 'node' bar
12062 * NODE
12063 * ELEM Object is a number : 1 -- predOp->ch2 = [1]
12064 *
12065 */
12066 maxPos = 0;
12067 predOp = NULL;
12068 hasPredicateRange = 0;
12069 hasAxisRange = 0;
12070 if (op->ch2 != -1) {
12071 /*
12072 * There's at least one predicate. 16 == XPATH_OP_PREDICATE
12073 */
12074 predOp = &ctxt->comp->steps[op->ch2];
12075 if (xmlXPathIsPositionalPredicate(ctxt, predOp, &maxPos)) {
12076 if (predOp->ch1 != -1) {
12077 /*
12078 * Use the next inner predicate operator.
12079 */
12080 predOp = &ctxt->comp->steps[predOp->ch1];
12081 hasPredicateRange = 1;
12082 } else {
12083 /*
12084 * There's no other predicate than the [n] predicate.
12085 */
12086 predOp = NULL;
12087 hasAxisRange = 1;
12088 }
12089 }
12090 }
12091 breakOnFirstHit = ((toBool) && (predOp == NULL)) ? 1 : 0;
12092 /*
12093 * Axis traversal -----------------------------------------------------
12094 */
12095 /*
12096 * 2.3 Node Tests
12097 * - For the attribute axis, the principal node type is attribute.
12098 * - For the namespace axis, the principal node type is namespace.
12099 * - For other axes, the principal node type is element.
12100 *
12101 * A node test * is true for any node of the
12102 * principal node type. For example, child::* will
12103 * select all element children of the context node
12104 */
12105 oldContextNode = xpctxt->node;
12106 addNode = xmlXPathNodeSetAddUnique;
12107 outSeq = NULL;
12108 seq = NULL;
12109 outerContextNode = NULL;
12110 contextNode = NULL;
12111 contextIdx = 0;
12112
12113
12114 while ((contextIdx < contextSeq->nodeNr) || (contextNode != NULL)) {
12115 if (outerNext != NULL) {
12116 /*
12117 * This is a compound traversal.
12118 */
12119 if (contextNode == NULL) {
12120 /*
12121 * Set the context for the outer traversal.
12122 */
12123 outerContextNode = contextSeq->nodeTab[contextIdx++];
12124 contextNode = outerNext(NULL, outerContextNode);
12125 } else
12126 contextNode = outerNext(contextNode, outerContextNode);
12127 if (contextNode == NULL)
12128 continue;
12129 /*
12130 * Set the context for the main traversal.
12131 */
12132 xpctxt->node = contextNode;
12133 } else
12134 xpctxt->node = contextSeq->nodeTab[contextIdx++];
12135
12136 if (seq == NULL) {
12137 seq = xmlXPathNodeSetCreate(NULL);
12138 if (seq == NULL) {
12139 total = 0;
12140 goto error;
12141 }
12142 }
12143 /*
12144 * Traverse the axis and test the nodes.
12145 */
12146 pos = 0;
12147 cur = NULL;
12148 hasNsNodes = 0;
12149 do {
12150 cur = next(ctxt, cur);
12151 if (cur == NULL)
12152 break;
12153
12154 /*
12155 * QUESTION TODO: What does the "first" and "last" stuff do?
12156 */
12157 if ((first != NULL) && (*first != NULL)) {
12158 if (*first == cur)
12159 break;
12160 if (((total % 256) == 0) &&
12161#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON
12162 (xmlXPathCmpNodesExt(*first, cur) >= 0))
12163#else
12164 (xmlXPathCmpNodes(*first, cur) >= 0))
12165#endif
12166 {
12167 break;
12168 }
12169 }
12170 if ((last != NULL) && (*last != NULL)) {
12171 if (*last == cur)
12172 break;
12173 if (((total % 256) == 0) &&
12174#ifdef XP_OPTIMIZED_NON_ELEM_COMPARISON
12175 (xmlXPathCmpNodesExt(cur, *last) >= 0))
12176#else
12177 (xmlXPathCmpNodes(cur, *last) >= 0))
12178#endif
12179 {
12180 break;
12181 }
12182 }
12183
12184 total++;
12185
12186#ifdef DEBUG_STEP
12187 xmlGenericError(xmlGenericErrorContext, " %s", cur->name);
12188#endif
12189
12190 switch (test) {
12191 case NODE_TEST_NONE:
12192 total = 0;
12193 STRANGE
12194 goto error;
12195 case NODE_TEST_TYPE:
12196 /*
12197 * TODO: Don't we need to use
12198 * xmlXPathNodeSetAddNs() for namespace nodes here?
12199 * Surprisingly, some c14n tests fail, if we do this.
12200 */
12201 if (type == NODE_TYPE_NODE) {
12202 switch (cur->type) {
12203 case XML_DOCUMENT_NODE:
12204 case XML_HTML_DOCUMENT_NODE:
12205#ifdef LIBXML_DOCB_ENABLED
12206 case XML_DOCB_DOCUMENT_NODE:
12207#endif
12208 case XML_ELEMENT_NODE:
12209 case XML_ATTRIBUTE_NODE:
12210 case XML_PI_NODE:
12211 case XML_COMMENT_NODE:
12212 case XML_CDATA_SECTION_NODE:
12213 case XML_TEXT_NODE:
12214 case XML_NAMESPACE_DECL:
12215 XP_TEST_HIT
12216 break;
12217 default:
12218 break;
12219 }
12220 } else if (cur->type == type) {
12221 if (type == XML_NAMESPACE_DECL)
12222 XP_TEST_HIT_NS
12223 else
12224 XP_TEST_HIT
12225 } else if ((type == NODE_TYPE_TEXT) &&
12226 (cur->type == XML_CDATA_SECTION_NODE))
12227 {
12228 XP_TEST_HIT
12229 }
12230 break;
12231 case NODE_TEST_PI:
12232 if ((cur->type == XML_PI_NODE) &&
12233 ((name == NULL) || xmlStrEqual(name, cur->name)))
12234 {
12235 XP_TEST_HIT
12236 }
12237 break;
12238 case NODE_TEST_ALL:
12239 if (axis == AXIS_ATTRIBUTE) {
12240 if (cur->type == XML_ATTRIBUTE_NODE)
12241 {
12242 XP_TEST_HIT
12243 }
12244 } else if (axis == AXIS_NAMESPACE) {
12245 if (cur->type == XML_NAMESPACE_DECL)
12246 {
12247 XP_TEST_HIT_NS
12248 }
12249 } else {
12250 if (cur->type == XML_ELEMENT_NODE) {
12251 if (prefix == NULL)
12252 {
12253 XP_TEST_HIT
12254
12255 } else if ((cur->ns != NULL) &&
12256 (xmlStrEqual(URI, cur->ns->href)))
12257 {
12258 XP_TEST_HIT
12259 }
12260 }
12261 }
12262 break;
12263 case NODE_TEST_NS:{
12264 TODO;
12265 break;
12266 }
12267 case NODE_TEST_NAME:
12268 if (axis == AXIS_ATTRIBUTE) {
12269 if (cur->type != XML_ATTRIBUTE_NODE)
12270 break;
12271 } else if (axis == AXIS_NAMESPACE) {
12272 if (cur->type != XML_NAMESPACE_DECL)
12273 break;
12274 } else {
12275 if (cur->type != XML_ELEMENT_NODE)
12276 break;
12277 }
12278 switch (cur->type) {
12279 case XML_ELEMENT_NODE:
12280 if (xmlStrEqual(name, cur->name)) {
12281 if (prefix == NULL) {
12282 if (cur->ns == NULL)
12283 {
12284 XP_TEST_HIT
12285 }
12286 } else {
12287 if ((cur->ns != NULL) &&
12288 (xmlStrEqual(URI, cur->ns->href)))
12289 {
12290 XP_TEST_HIT
12291 }
12292 }
12293 }
12294 break;
12295 case XML_ATTRIBUTE_NODE:{
12296 xmlAttrPtr attr = (xmlAttrPtr) cur;
12297
12298 if (xmlStrEqual(name, attr->name)) {
12299 if (prefix == NULL) {
12300 if ((attr->ns == NULL) ||
12301 (attr->ns->prefix == NULL))
12302 {
12303 XP_TEST_HIT
12304 }
12305 } else {
12306 if ((attr->ns != NULL) &&
12307 (xmlStrEqual(URI,
12308 attr->ns->href)))
12309 {
12310 XP_TEST_HIT
12311 }
12312 }
12313 }
12314 break;
12315 }
12316 case XML_NAMESPACE_DECL:
12317 if (cur->type == XML_NAMESPACE_DECL) {
12318 xmlNsPtr ns = (xmlNsPtr) cur;
12319
12320 if ((ns->prefix != NULL) && (name != NULL)
12321 && (xmlStrEqual(ns->prefix, name)))
12322 {
12323 XP_TEST_HIT_NS
12324 }
12325 }
12326 break;
12327 default:
12328 break;
12329 }
12330 break;
12331 } /* switch(test) */
12332 } while (cur != NULL);
12333
12334 goto apply_predicates;
12335
12336axis_range_end: /* ----------------------------------------------------- */
12337 /*
12338 * We have a "/foo[n]", and position() = n was reached.
12339 * Note that we can have as well "/foo/::parent::foo[1]", so
12340 * a duplicate-aware merge is still needed.
12341 * Merge with the result.
12342 */
12343 if (outSeq == NULL) {
12344 outSeq = seq;
12345 seq = NULL;
12346 } else
12347 outSeq = mergeAndClear(outSeq, seq, 0);
12348 /*
12349 * Break if only a true/false result was requested.
12350 */
12351 if (toBool)
12352 break;
12353 continue;
12354
12355first_hit: /* ---------------------------------------------------------- */
12356 /*
12357 * Break if only a true/false result was requested and
12358 * no predicates existed and a node test succeeded.
12359 */
12360 if (outSeq == NULL) {
12361 outSeq = seq;
12362 seq = NULL;
12363 } else
12364 outSeq = mergeAndClear(outSeq, seq, 0);
12365 break;
12366
12367#ifdef DEBUG_STEP
12368 if (seq != NULL)
12369 nbMatches += seq->nodeNr;
12370#endif
12371
12372apply_predicates: /* --------------------------------------------------- */
12373 /*
12374 * Apply predicates.
12375 */
12376 if ((predOp != NULL) && (seq->nodeNr > 0)) {
12377 /*
12378 * E.g. when we have a "/foo[some expression][n]".
12379 */
12380 /*
12381 * QUESTION TODO: The old predicate evaluation took into
12382 * account location-sets.
12383 * (E.g. ctxt->value->type == XPATH_LOCATIONSET)
12384 * Do we expect such a set here?
12385 * All what I learned now from the evaluation semantics
12386 * does not indicate that a location-set will be processed
12387 * here, so this looks OK.
12388 */
12389 /*
12390 * Iterate over all predicates, starting with the outermost
12391 * predicate.
12392 * TODO: Problem: we cannot execute the inner predicates first
12393 * since we cannot go back *up* the operator tree!
12394 * Options we have:
12395 * 1) Use of recursive functions (like is it currently done
12396 * via xmlXPathCompOpEval())
12397 * 2) Add a predicate evaluation information stack to the
12398 * context struct
12399 * 3) Change the way the operators are linked; we need a
12400 * "parent" field on xmlXPathStepOp
12401 *
12402 * For the moment, I'll try to solve this with a recursive
12403 * function: xmlXPathCompOpEvalPredicate().
12404 */
12405 size = seq->nodeNr;
12406 if (hasPredicateRange != 0)
12407 newSize = xmlXPathCompOpEvalPositionalPredicate(ctxt,
12408 predOp, seq, size, maxPos, maxPos, hasNsNodes);
12409 else
12410 newSize = xmlXPathCompOpEvalPredicate(ctxt,
12411 predOp, seq, size, hasNsNodes);
12412
12413 if (ctxt->error != XPATH_EXPRESSION_OK) {
12414 total = 0;
12415 goto error;
12416 }
12417 /*
12418 * Add the filtered set of nodes to the result node set.
12419 */
12420 if (newSize == 0) {
12421 /*
12422 * The predicates filtered all nodes out.
12423 */
12424 xmlXPathNodeSetClear(seq, hasNsNodes);
12425 } else if (seq->nodeNr > 0) {
12426 /*
12427 * Add to result set.
12428 */
12429 if (outSeq == NULL) {
12430 if (size != newSize) {
12431 /*
12432 * We need to merge and clear here, since
12433 * the sequence will contained NULLed entries.
12434 */
12435 outSeq = mergeAndClear(NULL, seq, 1);
12436 } else {
12437 outSeq = seq;
12438 seq = NULL;
12439 }
12440 } else
12441 outSeq = mergeAndClear(outSeq, seq,
12442 (size != newSize) ? 1: 0);
12443 /*
12444 * Break if only a true/false result was requested.
12445 */
12446 if (toBool)
12447 break;
12448 }
12449 } else if (seq->nodeNr > 0) {
12450 /*
12451 * Add to result set.
12452 */
12453 if (outSeq == NULL) {
12454 outSeq = seq;
12455 seq = NULL;
12456 } else {
12457 outSeq = mergeAndClear(outSeq, seq, 0);
12458 }
12459 }
12460 }
12461
12462error:
12463 if ((obj->boolval) && (obj->user != NULL)) {
12464 /*
12465 * QUESTION TODO: What does this do and why?
12466 * TODO: Do we have to do this also for the "error"
12467 * cleanup further down?
12468 */
12469 ctxt->value->boolval = 1;
12470 ctxt->value->user = obj->user;
12471 obj->user = NULL;
12472 obj->boolval = 0;
12473 }
12474 xmlXPathReleaseObject(xpctxt, obj);
12475
12476 /*
12477 * Ensure we return at least an emtpy set.
12478 */
12479 if (outSeq == NULL) {
12480 if ((seq != NULL) && (seq->nodeNr == 0))
12481 outSeq = seq;
12482 else
12483 outSeq = xmlXPathNodeSetCreate(NULL);
12484 }
12485 if ((seq != NULL) && (seq != outSeq)) {
12486 xmlXPathFreeNodeSet(seq);
12487 }
12488 /*
12489 * Hand over the result. Better to push the set also in
12490 * case of errors.
12491 */
12492 valuePush(ctxt, xmlXPathCacheWrapNodeSet(xpctxt, outSeq));
12493 /*
12494 * Reset the context node.
12495 */
12496 xpctxt->node = oldContextNode;
12497
12498#ifdef DEBUG_STEP
12499 xmlGenericError(xmlGenericErrorContext,
12500 "\nExamined %d nodes, found %d nodes at that step\n",
12501 total, nbMatches);
12502#endif
12503
12504 return(total);
12505}
12506
12507static int
12508xmlXPathCompOpEvalFilterFirst(xmlXPathParserContextPtr ctxt,
12509 xmlXPathStepOpPtr op, xmlNodePtr * first);
12510
12511/**
12512 * xmlXPathCompOpEvalFirst:
12513 * @ctxt: the XPath parser context with the compiled expression
12514 * @op: an XPath compiled operation
12515 * @first: the first elem found so far
12516 *
12517 * Evaluate the Precompiled XPath operation searching only the first
12518 * element in document order
12519 *
12520 * Returns the number of examined objects.
12521 */
12522static int
12523xmlXPathCompOpEvalFirst(xmlXPathParserContextPtr ctxt,
12524 xmlXPathStepOpPtr op, xmlNodePtr * first)
12525{
12526 int total = 0, cur;
12527 xmlXPathCompExprPtr comp;
12528 xmlXPathObjectPtr arg1, arg2;
12529
12530 CHECK_ERROR0;
12531 comp = ctxt->comp;
12532 switch (op->op) {
12533 case XPATH_OP_END:
12534 return (0);
12535 case XPATH_OP_UNION:
12536 total =
12537 xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch1],
12538 first);
12539 CHECK_ERROR0;
12540 if ((ctxt->value != NULL)
12541 && (ctxt->value->type == XPATH_NODESET)
12542 && (ctxt->value->nodesetval != NULL)
12543 && (ctxt->value->nodesetval->nodeNr >= 1)) {
12544 /*
12545 * limit tree traversing to first node in the result
12546 */
12547 /*
12548 * OPTIMIZE TODO: This implicitely sorts
12549 * the result, even if not needed. E.g. if the argument
12550 * of the count() function, no sorting is needed.
12551 * OPTIMIZE TODO: How do we know if the node-list wasn't
12552 * aready sorted?
12553 */
12554 if (ctxt->value->nodesetval->nodeNr > 1)
12555 xmlXPathNodeSetSort(ctxt->value->nodesetval);
12556 *first = ctxt->value->nodesetval->nodeTab[0];
12557 }
12558 cur =
12559 xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch2],
12560 first);
12561 CHECK_ERROR0;
12562 CHECK_TYPE0(XPATH_NODESET);
12563 arg2 = valuePop(ctxt);
12564
12565 CHECK_TYPE0(XPATH_NODESET);
12566 arg1 = valuePop(ctxt);
12567
12568 arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval,
12569 arg2->nodesetval);
12570 valuePush(ctxt, arg1);
12571 xmlXPathReleaseObject(ctxt->context, arg2);
12572 /* optimizer */
12573 if (total > cur)
12574 xmlXPathCompSwap(op);
12575 return (total + cur);
12576 case XPATH_OP_ROOT:
12577 xmlXPathRoot(ctxt);
12578 return (0);
12579 case XPATH_OP_NODE:
12580 if (op->ch1 != -1)
12581 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12582 CHECK_ERROR0;
12583 if (op->ch2 != -1)
12584 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12585 CHECK_ERROR0;
12586 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
12587 ctxt->context->node));
12588 return (total);
12589 case XPATH_OP_RESET:
12590 if (op->ch1 != -1)
12591 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12592 CHECK_ERROR0;
12593 if (op->ch2 != -1)
12594 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12595 CHECK_ERROR0;
12596 ctxt->context->node = NULL;
12597 return (total);
12598 case XPATH_OP_COLLECT:{
12599 if (op->ch1 == -1)
12600 return (total);
12601
12602 total = xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12603 CHECK_ERROR0;
12604
12605 total += xmlXPathNodeCollectAndTest(ctxt, op, first, NULL, 0);
12606 return (total);
12607 }
12608 case XPATH_OP_VALUE:
12609 valuePush(ctxt,
12610 xmlXPathCacheObjectCopy(ctxt->context,
12611 (xmlXPathObjectPtr) op->value4));
12612 return (0);
12613 case XPATH_OP_SORT:
12614 if (op->ch1 != -1)
12615 total +=
12616 xmlXPathCompOpEvalFirst(ctxt, &comp->steps[op->ch1],
12617 first);
12618 CHECK_ERROR0;
12619 if ((ctxt->value != NULL)
12620 && (ctxt->value->type == XPATH_NODESET)
12621 && (ctxt->value->nodesetval != NULL)
12622 && (ctxt->value->nodesetval->nodeNr > 1))
12623 xmlXPathNodeSetSort(ctxt->value->nodesetval);
12624 return (total);
12625#ifdef XP_OPTIMIZED_FILTER_FIRST
12626 case XPATH_OP_FILTER:
12627 total =+ xmlXPathCompOpEvalFilterFirst(ctxt, op, first);
12628 return (total);
12629#endif
12630 default:
12631 return (xmlXPathCompOpEval(ctxt, op));
12632 }
12633}
12634
12635/**
12636 * xmlXPathCompOpEvalLast:
12637 * @ctxt: the XPath parser context with the compiled expression
12638 * @op: an XPath compiled operation
12639 * @last: the last elem found so far
12640 *
12641 * Evaluate the Precompiled XPath operation searching only the last
12642 * element in document order
12643 *
12644 * Returns the number of nodes traversed
12645 */
12646static int
12647xmlXPathCompOpEvalLast(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op,
12648 xmlNodePtr * last)
12649{
12650 int total = 0, cur;
12651 xmlXPathCompExprPtr comp;
12652 xmlXPathObjectPtr arg1, arg2;
12653 xmlNodePtr bak;
12654 xmlDocPtr bakd;
12655 int pp;
12656 int cs;
12657
12658 CHECK_ERROR0;
12659 comp = ctxt->comp;
12660 switch (op->op) {
12661 case XPATH_OP_END:
12662 return (0);
12663 case XPATH_OP_UNION:
12664 bakd = ctxt->context->doc;
12665 bak = ctxt->context->node;
12666 pp = ctxt->context->proximityPosition;
12667 cs = ctxt->context->contextSize;
12668 total =
12669 xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch1], last);
12670 CHECK_ERROR0;
12671 if ((ctxt->value != NULL)
12672 && (ctxt->value->type == XPATH_NODESET)
12673 && (ctxt->value->nodesetval != NULL)
12674 && (ctxt->value->nodesetval->nodeNr >= 1)) {
12675 /*
12676 * limit tree traversing to first node in the result
12677 */
12678 if (ctxt->value->nodesetval->nodeNr > 1)
12679 xmlXPathNodeSetSort(ctxt->value->nodesetval);
12680 *last =
12681 ctxt->value->nodesetval->nodeTab[ctxt->value->
12682 nodesetval->nodeNr -
12683 1];
12684 }
12685 ctxt->context->doc = bakd;
12686 ctxt->context->node = bak;
12687 ctxt->context->proximityPosition = pp;
12688 ctxt->context->contextSize = cs;
12689 cur =
12690 xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch2], last);
12691 CHECK_ERROR0;
12692 if ((ctxt->value != NULL)
12693 && (ctxt->value->type == XPATH_NODESET)
12694 && (ctxt->value->nodesetval != NULL)
12695 && (ctxt->value->nodesetval->nodeNr >= 1)) { /* TODO: NOP ? */
12696 }
12697 CHECK_TYPE0(XPATH_NODESET);
12698 arg2 = valuePop(ctxt);
12699
12700 CHECK_TYPE0(XPATH_NODESET);
12701 arg1 = valuePop(ctxt);
12702
12703 arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval,
12704 arg2->nodesetval);
12705 valuePush(ctxt, arg1);
12706 xmlXPathReleaseObject(ctxt->context, arg2);
12707 /* optimizer */
12708 if (total > cur)
12709 xmlXPathCompSwap(op);
12710 return (total + cur);
12711 case XPATH_OP_ROOT:
12712 xmlXPathRoot(ctxt);
12713 return (0);
12714 case XPATH_OP_NODE:
12715 if (op->ch1 != -1)
12716 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12717 CHECK_ERROR0;
12718 if (op->ch2 != -1)
12719 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12720 CHECK_ERROR0;
12721 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
12722 ctxt->context->node));
12723 return (total);
12724 case XPATH_OP_RESET:
12725 if (op->ch1 != -1)
12726 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12727 CHECK_ERROR0;
12728 if (op->ch2 != -1)
12729 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12730 CHECK_ERROR0;
12731 ctxt->context->node = NULL;
12732 return (total);
12733 case XPATH_OP_COLLECT:{
12734 if (op->ch1 == -1)
12735 return (0);
12736
12737 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12738 CHECK_ERROR0;
12739
12740 total += xmlXPathNodeCollectAndTest(ctxt, op, NULL, last, 0);
12741 return (total);
12742 }
12743 case XPATH_OP_VALUE:
12744 valuePush(ctxt,
12745 xmlXPathCacheObjectCopy(ctxt->context,
12746 (xmlXPathObjectPtr) op->value4));
12747 return (0);
12748 case XPATH_OP_SORT:
12749 if (op->ch1 != -1)
12750 total +=
12751 xmlXPathCompOpEvalLast(ctxt, &comp->steps[op->ch1],
12752 last);
12753 CHECK_ERROR0;
12754 if ((ctxt->value != NULL)
12755 && (ctxt->value->type == XPATH_NODESET)
12756 && (ctxt->value->nodesetval != NULL)
12757 && (ctxt->value->nodesetval->nodeNr > 1))
12758 xmlXPathNodeSetSort(ctxt->value->nodesetval);
12759 return (total);
12760 default:
12761 return (xmlXPathCompOpEval(ctxt, op));
12762 }
12763}
12764
12765#ifdef XP_OPTIMIZED_FILTER_FIRST
12766static int
12767xmlXPathCompOpEvalFilterFirst(xmlXPathParserContextPtr ctxt,
12768 xmlXPathStepOpPtr op, xmlNodePtr * first)
12769{
12770 int total = 0;
12771 xmlXPathCompExprPtr comp;
12772 xmlXPathObjectPtr res;
12773 xmlXPathObjectPtr obj;
12774 xmlNodeSetPtr oldset;
12775 xmlNodePtr oldnode;
12776 xmlDocPtr oldDoc;
12777 int i;
12778
12779 CHECK_ERROR0;
12780 comp = ctxt->comp;
12781 /*
12782 * Optimization for ()[last()] selection i.e. the last elem
12783 */
12784 if ((op->ch1 != -1) && (op->ch2 != -1) &&
12785 (comp->steps[op->ch1].op == XPATH_OP_SORT) &&
12786 (comp->steps[op->ch2].op == XPATH_OP_SORT)) {
12787 int f = comp->steps[op->ch2].ch1;
12788
12789 if ((f != -1) &&
12790 (comp->steps[f].op == XPATH_OP_FUNCTION) &&
12791 (comp->steps[f].value5 == NULL) &&
12792 (comp->steps[f].value == 0) &&
12793 (comp->steps[f].value4 != NULL) &&
12794 (xmlStrEqual
12795 (comp->steps[f].value4, BAD_CAST "last"))) {
12796 xmlNodePtr last = NULL;
12797
12798 total +=
12799 xmlXPathCompOpEvalLast(ctxt,
12800 &comp->steps[op->ch1],
12801 &last);
12802 CHECK_ERROR0;
12803 /*
12804 * The nodeset should be in document order,
12805 * Keep only the last value
12806 */
12807 if ((ctxt->value != NULL) &&
12808 (ctxt->value->type == XPATH_NODESET) &&
12809 (ctxt->value->nodesetval != NULL) &&
12810 (ctxt->value->nodesetval->nodeTab != NULL) &&
12811 (ctxt->value->nodesetval->nodeNr > 1)) {
12812 ctxt->value->nodesetval->nodeTab[0] =
12813 ctxt->value->nodesetval->nodeTab[ctxt->
12814 value->
12815 nodesetval->
12816 nodeNr -
12817 1];
12818 ctxt->value->nodesetval->nodeNr = 1;
12819 *first = *(ctxt->value->nodesetval->nodeTab);
12820 }
12821 return (total);
12822 }
12823 }
12824
12825 if (op->ch1 != -1)
12826 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
12827 CHECK_ERROR0;
12828 if (op->ch2 == -1)
12829 return (total);
12830 if (ctxt->value == NULL)
12831 return (total);
12832
12833#ifdef LIBXML_XPTR_ENABLED
12834 oldnode = ctxt->context->node;
12835 /*
12836 * Hum are we filtering the result of an XPointer expression
12837 */
12838 if (ctxt->value->type == XPATH_LOCATIONSET) {
12839 xmlXPathObjectPtr tmp = NULL;
12840 xmlLocationSetPtr newlocset = NULL;
12841 xmlLocationSetPtr oldlocset;
12842
12843 /*
12844 * Extract the old locset, and then evaluate the result of the
12845 * expression for all the element in the locset. use it to grow
12846 * up a new locset.
12847 */
12848 CHECK_TYPE0(XPATH_LOCATIONSET);
12849 obj = valuePop(ctxt);
12850 oldlocset = obj->user;
12851 ctxt->context->node = NULL;
12852
12853 if ((oldlocset == NULL) || (oldlocset->locNr == 0)) {
12854 ctxt->context->contextSize = 0;
12855 ctxt->context->proximityPosition = 0;
12856 if (op->ch2 != -1)
12857 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12858 res = valuePop(ctxt);
12859 if (res != NULL) {
12860 xmlXPathReleaseObject(ctxt->context, res);
12861 }
12862 valuePush(ctxt, obj);
12863 CHECK_ERROR0;
12864 return (total);
12865 }
12866 newlocset = xmlXPtrLocationSetCreate(NULL);
12867
12868 for (i = 0; i < oldlocset->locNr; i++) {
12869 /*
12870 * Run the evaluation with a node list made of a
12871 * single item in the nodelocset.
12872 */
12873 ctxt->context->node = oldlocset->locTab[i]->user;
12874 ctxt->context->contextSize = oldlocset->locNr;
12875 ctxt->context->proximityPosition = i + 1;
12876 if (tmp == NULL) {
12877 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
12878 ctxt->context->node);
12879 } else {
12880 xmlXPathNodeSetAddUnique(tmp->nodesetval,
12881 ctxt->context->node);
12882 }
12883 valuePush(ctxt, tmp);
12884 if (op->ch2 != -1)
12885 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
12886 if (ctxt->error != XPATH_EXPRESSION_OK) {
12887 xmlXPathFreeObject(obj);
12888 return(0);
12889 }
12890 /*
12891 * The result of the evaluation need to be tested to
12892 * decided whether the filter succeeded or not
12893 */
12894 res = valuePop(ctxt);
12895 if (xmlXPathEvaluatePredicateResult(ctxt, res)) {
12896 xmlXPtrLocationSetAdd(newlocset,
12897 xmlXPathCacheObjectCopy(ctxt->context,
12898 oldlocset->locTab[i]));
12899 }
12900 /*
12901 * Cleanup
12902 */
12903 if (res != NULL) {
12904 xmlXPathReleaseObject(ctxt->context, res);
12905 }
12906 if (ctxt->value == tmp) {
12907 valuePop(ctxt);
12908 xmlXPathNodeSetClear(tmp->nodesetval, 1);
12909 /*
12910 * REVISIT TODO: Don't create a temporary nodeset
12911 * for everly iteration.
12912 */
12913 /* OLD: xmlXPathFreeObject(res); */
12914 } else
12915 tmp = NULL;
12916 ctxt->context->node = NULL;
12917 /*
12918 * Only put the first node in the result, then leave.
12919 */
12920 if (newlocset->locNr > 0) {
12921 *first = (xmlNodePtr) oldlocset->locTab[i]->user;
12922 break;
12923 }
12924 }
12925 if (tmp != NULL) {
12926 xmlXPathReleaseObject(ctxt->context, tmp);
12927 }
12928 /*
12929 * The result is used as the new evaluation locset.
12930 */
12931 xmlXPathReleaseObject(ctxt->context, obj);
12932 ctxt->context->node = NULL;
12933 ctxt->context->contextSize = -1;
12934 ctxt->context->proximityPosition = -1;
12935 valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset));
12936 ctxt->context->node = oldnode;
12937 return (total);
12938 }
12939#endif /* LIBXML_XPTR_ENABLED */
12940
12941 /*
12942 * Extract the old set, and then evaluate the result of the
12943 * expression for all the element in the set. use it to grow
12944 * up a new set.
12945 */
12946 CHECK_TYPE0(XPATH_NODESET);
12947 obj = valuePop(ctxt);
12948 oldset = obj->nodesetval;
12949
12950 oldnode = ctxt->context->node;
12951 oldDoc = ctxt->context->doc;
12952 ctxt->context->node = NULL;
12953
12954 if ((oldset == NULL) || (oldset->nodeNr == 0)) {
12955 ctxt->context->contextSize = 0;
12956 ctxt->context->proximityPosition = 0;
12957 /* QUESTION TODO: Why was this code commented out?
12958 if (op->ch2 != -1)
12959 total +=
12960 xmlXPathCompOpEval(ctxt,
12961 &comp->steps[op->ch2]);
12962 CHECK_ERROR0;
12963 res = valuePop(ctxt);
12964 if (res != NULL)
12965 xmlXPathFreeObject(res);
12966 */
12967 valuePush(ctxt, obj);
12968 ctxt->context->node = oldnode;
12969 CHECK_ERROR0;
12970 } else {
12971 xmlNodeSetPtr newset;
12972 xmlXPathObjectPtr tmp = NULL;
12973 /*
12974 * Initialize the new set.
12975 * Also set the xpath document in case things like
12976 * key() evaluation are attempted on the predicate
12977 */
12978 newset = xmlXPathNodeSetCreate(NULL);
12979
12980 for (i = 0; i < oldset->nodeNr; i++) {
12981 /*
12982 * Run the evaluation with a node list made of
12983 * a single item in the nodeset.
12984 */
12985 ctxt->context->node = oldset->nodeTab[i];
12986 if ((oldset->nodeTab[i]->type != XML_NAMESPACE_DECL) &&
12987 (oldset->nodeTab[i]->doc != NULL))
12988 ctxt->context->doc = oldset->nodeTab[i]->doc;
12989 if (tmp == NULL) {
12990 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
12991 ctxt->context->node);
12992 } else {
12993 xmlXPathNodeSetAddUnique(tmp->nodesetval,
12994 ctxt->context->node);
12995 }
12996 valuePush(ctxt, tmp);
12997 ctxt->context->contextSize = oldset->nodeNr;
12998 ctxt->context->proximityPosition = i + 1;
12999 if (op->ch2 != -1)
13000 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13001 if (ctxt->error != XPATH_EXPRESSION_OK) {
13002 xmlXPathFreeNodeSet(newset);
13003 xmlXPathFreeObject(obj);
13004 return(0);
13005 }
13006 /*
13007 * The result of the evaluation needs to be tested to
13008 * decide whether the filter succeeded or not
13009 */
13010 res = valuePop(ctxt);
13011 if (xmlXPathEvaluatePredicateResult(ctxt, res)) {
13012 xmlXPathNodeSetAdd(newset, oldset->nodeTab[i]);
13013 }
13014 /*
13015 * Cleanup
13016 */
13017 if (res != NULL) {
13018 xmlXPathReleaseObject(ctxt->context, res);
13019 }
13020 if (ctxt->value == tmp) {
13021 valuePop(ctxt);
13022 /*
13023 * Don't free the temporary nodeset
13024 * in order to avoid massive recreation inside this
13025 * loop.
13026 */
13027 xmlXPathNodeSetClear(tmp->nodesetval, 1);
13028 } else
13029 tmp = NULL;
13030 ctxt->context->node = NULL;
13031 /*
13032 * Only put the first node in the result, then leave.
13033 */
13034 if (newset->nodeNr > 0) {
13035 *first = *(newset->nodeTab);
13036 break;
13037 }
13038 }
13039 if (tmp != NULL) {
13040 xmlXPathReleaseObject(ctxt->context, tmp);
13041 }
13042 /*
13043 * The result is used as the new evaluation set.
13044 */
13045 xmlXPathReleaseObject(ctxt->context, obj);
13046 ctxt->context->node = NULL;
13047 ctxt->context->contextSize = -1;
13048 ctxt->context->proximityPosition = -1;
13049 /* may want to move this past the '}' later */
13050 ctxt->context->doc = oldDoc;
13051 valuePush(ctxt, xmlXPathCacheWrapNodeSet(ctxt->context, newset));
13052 }
13053 ctxt->context->node = oldnode;
13054 return(total);
13055}
13056#endif /* XP_OPTIMIZED_FILTER_FIRST */
13057
13058/**
13059 * xmlXPathCompOpEval:
13060 * @ctxt: the XPath parser context with the compiled expression
13061 * @op: an XPath compiled operation
13062 *
13063 * Evaluate the Precompiled XPath operation
13064 * Returns the number of nodes traversed
13065 */
13066static int
13067xmlXPathCompOpEval(xmlXPathParserContextPtr ctxt, xmlXPathStepOpPtr op)
13068{
13069 int total = 0;
13070 int equal, ret;
13071 xmlXPathCompExprPtr comp;
13072 xmlXPathObjectPtr arg1, arg2;
13073 xmlNodePtr bak;
13074 xmlDocPtr bakd;
13075 int pp;
13076 int cs;
13077
13078 CHECK_ERROR0;
13079 comp = ctxt->comp;
13080 switch (op->op) {
13081 case XPATH_OP_END:
13082 return (0);
13083 case XPATH_OP_AND:
13084 bakd = ctxt->context->doc;
13085 bak = ctxt->context->node;
13086 pp = ctxt->context->proximityPosition;
13087 cs = ctxt->context->contextSize;
13088 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13089 CHECK_ERROR0;
13090 xmlXPathBooleanFunction(ctxt, 1);
13091 if ((ctxt->value == NULL) || (ctxt->value->boolval == 0))
13092 return (total);
13093 arg2 = valuePop(ctxt);
13094 ctxt->context->doc = bakd;
13095 ctxt->context->node = bak;
13096 ctxt->context->proximityPosition = pp;
13097 ctxt->context->contextSize = cs;
13098 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13099 if (ctxt->error) {
13100 xmlXPathFreeObject(arg2);
13101 return(0);
13102 }
13103 xmlXPathBooleanFunction(ctxt, 1);
13104 arg1 = valuePop(ctxt);
13105 arg1->boolval &= arg2->boolval;
13106 valuePush(ctxt, arg1);
13107 xmlXPathReleaseObject(ctxt->context, arg2);
13108 return (total);
13109 case XPATH_OP_OR:
13110 bakd = ctxt->context->doc;
13111 bak = ctxt->context->node;
13112 pp = ctxt->context->proximityPosition;
13113 cs = ctxt->context->contextSize;
13114 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13115 CHECK_ERROR0;
13116 xmlXPathBooleanFunction(ctxt, 1);
13117 if ((ctxt->value == NULL) || (ctxt->value->boolval == 1))
13118 return (total);
13119 arg2 = valuePop(ctxt);
13120 ctxt->context->doc = bakd;
13121 ctxt->context->node = bak;
13122 ctxt->context->proximityPosition = pp;
13123 ctxt->context->contextSize = cs;
13124 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13125 if (ctxt->error) {
13126 xmlXPathFreeObject(arg2);
13127 return(0);
13128 }
13129 xmlXPathBooleanFunction(ctxt, 1);
13130 arg1 = valuePop(ctxt);
13131 arg1->boolval |= arg2->boolval;
13132 valuePush(ctxt, arg1);
13133 xmlXPathReleaseObject(ctxt->context, arg2);
13134 return (total);
13135 case XPATH_OP_EQUAL:
13136 bakd = ctxt->context->doc;
13137 bak = ctxt->context->node;
13138 pp = ctxt->context->proximityPosition;
13139 cs = ctxt->context->contextSize;
13140 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13141 CHECK_ERROR0;
13142 ctxt->context->doc = bakd;
13143 ctxt->context->node = bak;
13144 ctxt->context->proximityPosition = pp;
13145 ctxt->context->contextSize = cs;
13146 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13147 CHECK_ERROR0;
13148 if (op->value)
13149 equal = xmlXPathEqualValues(ctxt);
13150 else
13151 equal = xmlXPathNotEqualValues(ctxt);
13152 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, equal));
13153 return (total);
13154 case XPATH_OP_CMP:
13155 bakd = ctxt->context->doc;
13156 bak = ctxt->context->node;
13157 pp = ctxt->context->proximityPosition;
13158 cs = ctxt->context->contextSize;
13159 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13160 CHECK_ERROR0;
13161 ctxt->context->doc = bakd;
13162 ctxt->context->node = bak;
13163 ctxt->context->proximityPosition = pp;
13164 ctxt->context->contextSize = cs;
13165 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13166 CHECK_ERROR0;
13167 ret = xmlXPathCompareValues(ctxt, op->value, op->value2);
13168 valuePush(ctxt, xmlXPathCacheNewBoolean(ctxt->context, ret));
13169 return (total);
13170 case XPATH_OP_PLUS:
13171 bakd = ctxt->context->doc;
13172 bak = ctxt->context->node;
13173 pp = ctxt->context->proximityPosition;
13174 cs = ctxt->context->contextSize;
13175 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13176 CHECK_ERROR0;
13177 if (op->ch2 != -1) {
13178 ctxt->context->doc = bakd;
13179 ctxt->context->node = bak;
13180 ctxt->context->proximityPosition = pp;
13181 ctxt->context->contextSize = cs;
13182 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13183 }
13184 CHECK_ERROR0;
13185 if (op->value == 0)
13186 xmlXPathSubValues(ctxt);
13187 else if (op->value == 1)
13188 xmlXPathAddValues(ctxt);
13189 else if (op->value == 2)
13190 xmlXPathValueFlipSign(ctxt);
13191 else if (op->value == 3) {
13192 CAST_TO_NUMBER;
13193 CHECK_TYPE0(XPATH_NUMBER);
13194 }
13195 return (total);
13196 case XPATH_OP_MULT:
13197 bakd = ctxt->context->doc;
13198 bak = ctxt->context->node;
13199 pp = ctxt->context->proximityPosition;
13200 cs = ctxt->context->contextSize;
13201 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13202 CHECK_ERROR0;
13203 ctxt->context->doc = bakd;
13204 ctxt->context->node = bak;
13205 ctxt->context->proximityPosition = pp;
13206 ctxt->context->contextSize = cs;
13207 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13208 CHECK_ERROR0;
13209 if (op->value == 0)
13210 xmlXPathMultValues(ctxt);
13211 else if (op->value == 1)
13212 xmlXPathDivValues(ctxt);
13213 else if (op->value == 2)
13214 xmlXPathModValues(ctxt);
13215 return (total);
13216 case XPATH_OP_UNION:
13217 bakd = ctxt->context->doc;
13218 bak = ctxt->context->node;
13219 pp = ctxt->context->proximityPosition;
13220 cs = ctxt->context->contextSize;
13221 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13222 CHECK_ERROR0;
13223 ctxt->context->doc = bakd;
13224 ctxt->context->node = bak;
13225 ctxt->context->proximityPosition = pp;
13226 ctxt->context->contextSize = cs;
13227 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13228 CHECK_ERROR0;
13229 CHECK_TYPE0(XPATH_NODESET);
13230 arg2 = valuePop(ctxt);
13231
13232 CHECK_TYPE0(XPATH_NODESET);
13233 arg1 = valuePop(ctxt);
13234
13235 if ((arg1->nodesetval == NULL) ||
13236 ((arg2->nodesetval != NULL) &&
13237 (arg2->nodesetval->nodeNr != 0)))
13238 {
13239 arg1->nodesetval = xmlXPathNodeSetMerge(arg1->nodesetval,
13240 arg2->nodesetval);
13241 }
13242
13243 valuePush(ctxt, arg1);
13244 xmlXPathReleaseObject(ctxt->context, arg2);
13245 return (total);
13246 case XPATH_OP_ROOT:
13247 xmlXPathRoot(ctxt);
13248 return (total);
13249 case XPATH_OP_NODE:
13250 if (op->ch1 != -1)
13251 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13252 CHECK_ERROR0;
13253 if (op->ch2 != -1)
13254 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13255 CHECK_ERROR0;
13256 valuePush(ctxt, xmlXPathCacheNewNodeSet(ctxt->context,
13257 ctxt->context->node));
13258 return (total);
13259 case XPATH_OP_RESET:
13260 if (op->ch1 != -1)
13261 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13262 CHECK_ERROR0;
13263 if (op->ch2 != -1)
13264 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13265 CHECK_ERROR0;
13266 ctxt->context->node = NULL;
13267 return (total);
13268 case XPATH_OP_COLLECT:{
13269 if (op->ch1 == -1)
13270 return (total);
13271
13272 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13273 CHECK_ERROR0;
13274
13275 total += xmlXPathNodeCollectAndTest(ctxt, op, NULL, NULL, 0);
13276 return (total);
13277 }
13278 case XPATH_OP_VALUE:
13279 valuePush(ctxt,
13280 xmlXPathCacheObjectCopy(ctxt->context,
13281 (xmlXPathObjectPtr) op->value4));
13282 return (total);
13283 case XPATH_OP_VARIABLE:{
13284 xmlXPathObjectPtr val;
13285
13286 if (op->ch1 != -1)
13287 total +=
13288 xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13289 if (op->value5 == NULL) {
13290 val = xmlXPathVariableLookup(ctxt->context, op->value4);
13291 if (val == NULL) {
13292 ctxt->error = XPATH_UNDEF_VARIABLE_ERROR;
13293 return(0);
13294 }
13295 valuePush(ctxt, val);
13296 } else {
13297 const xmlChar *URI;
13298
13299 URI = xmlXPathNsLookup(ctxt->context, op->value5);
13300 if (URI == NULL) {
13301 xmlGenericError(xmlGenericErrorContext,
13302 "xmlXPathCompOpEval: variable %s bound to undefined prefix %s\n",
13303 op->value4, op->value5);
13304 return (total);
13305 }
13306 val = xmlXPathVariableLookupNS(ctxt->context,
13307 op->value4, URI);
13308 if (val == NULL) {
13309 ctxt->error = XPATH_UNDEF_VARIABLE_ERROR;
13310 return(0);
13311 }
13312 valuePush(ctxt, val);
13313 }
13314 return (total);
13315 }
13316 case XPATH_OP_FUNCTION:{
13317 xmlXPathFunction func;
13318 const xmlChar *oldFunc, *oldFuncURI;
13319 int i;
13320
13321 if (op->ch1 != -1)
13322 total +=
13323 xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13324 if (ctxt->valueNr < op->value) {
13325 xmlGenericError(xmlGenericErrorContext,
13326 "xmlXPathCompOpEval: parameter error\n");
13327 ctxt->error = XPATH_INVALID_OPERAND;
13328 return (total);
13329 }
13330 for (i = 0; i < op->value; i++)
13331 if (ctxt->valueTab[(ctxt->valueNr - 1) - i] == NULL) {
13332 xmlGenericError(xmlGenericErrorContext,
13333 "xmlXPathCompOpEval: parameter error\n");
13334 ctxt->error = XPATH_INVALID_OPERAND;
13335 return (total);
13336 }
13337 if (op->cache != NULL)
13338 XML_CAST_FPTR(func) = op->cache;
13339 else {
13340 const xmlChar *URI = NULL;
13341
13342 if (op->value5 == NULL)
13343 func =
13344 xmlXPathFunctionLookup(ctxt->context,
13345 op->value4);
13346 else {
13347 URI = xmlXPathNsLookup(ctxt->context, op->value5);
13348 if (URI == NULL) {
13349 xmlGenericError(xmlGenericErrorContext,
13350 "xmlXPathCompOpEval: function %s bound to undefined prefix %s\n",
13351 op->value4, op->value5);
13352 return (total);
13353 }
13354 func = xmlXPathFunctionLookupNS(ctxt->context,
13355 op->value4, URI);
13356 }
13357 if (func == NULL) {
13358 xmlGenericError(xmlGenericErrorContext,
13359 "xmlXPathCompOpEval: function %s not found\n",
13360 op->value4);
13361 XP_ERROR0(XPATH_UNKNOWN_FUNC_ERROR);
13362 }
13363 op->cache = XML_CAST_FPTR(func);
13364 op->cacheURI = (void *) URI;
13365 }
13366 oldFunc = ctxt->context->function;
13367 oldFuncURI = ctxt->context->functionURI;
13368 ctxt->context->function = op->value4;
13369 ctxt->context->functionURI = op->cacheURI;
13370 func(ctxt, op->value);
13371 ctxt->context->function = oldFunc;
13372 ctxt->context->functionURI = oldFuncURI;
13373 return (total);
13374 }
13375 case XPATH_OP_ARG:
13376 bakd = ctxt->context->doc;
13377 bak = ctxt->context->node;
13378 pp = ctxt->context->proximityPosition;
13379 cs = ctxt->context->contextSize;
13380 if (op->ch1 != -1)
13381 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13382 ctxt->context->contextSize = cs;
13383 ctxt->context->proximityPosition = pp;
13384 ctxt->context->node = bak;
13385 ctxt->context->doc = bakd;
13386 CHECK_ERROR0;
13387 if (op->ch2 != -1) {
13388 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch2]);
13389 ctxt->context->doc = bakd;
13390 ctxt->context->node = bak;
13391 CHECK_ERROR0;
13392 }
13393 return (total);
13394 case XPATH_OP_PREDICATE:
13395 case XPATH_OP_FILTER:{
13396 xmlXPathObjectPtr res;
13397 xmlXPathObjectPtr obj, tmp;
13398 xmlNodeSetPtr newset = NULL;
13399 xmlNodeSetPtr oldset;
13400 xmlNodePtr oldnode;
13401 xmlDocPtr oldDoc;
13402 int i;
13403
13404 /*
13405 * Optimization for ()[1] selection i.e. the first elem
13406 */
13407 if ((op->ch1 != -1) && (op->ch2 != -1) &&
13408#ifdef XP_OPTIMIZED_FILTER_FIRST
13409 /*
13410 * FILTER TODO: Can we assume that the inner processing
13411 * will result in an ordered list if we have an
13412 * XPATH_OP_FILTER?
13413 * What about an additional field or flag on
13414 * xmlXPathObject like @sorted ? This way we wouln'd need
13415 * to assume anything, so it would be more robust and
13416 * easier to optimize.
13417 */
13418 ((comp->steps[op->ch1].op == XPATH_OP_SORT) || /* 18 */
13419 (comp->steps[op->ch1].op == XPATH_OP_FILTER)) && /* 17 */
13420#else
13421 (comp->steps[op->ch1].op == XPATH_OP_SORT) &&
13422#endif
13423 (comp->steps[op->ch2].op == XPATH_OP_VALUE)) { /* 12 */
13424 xmlXPathObjectPtr val;
13425
13426 val = comp->steps[op->ch2].value4;
13427 if ((val != NULL) && (val->type == XPATH_NUMBER) &&
13428 (val->floatval == 1.0)) {
13429 xmlNodePtr first = NULL;
13430
13431 total +=
13432 xmlXPathCompOpEvalFirst(ctxt,
13433 &comp->steps[op->ch1],
13434 &first);
13435 CHECK_ERROR0;
13436 /*
13437 * The nodeset should be in document order,
13438 * Keep only the first value
13439 */
13440 if ((ctxt->value != NULL) &&
13441 (ctxt->value->type == XPATH_NODESET) &&
13442 (ctxt->value->nodesetval != NULL) &&
13443 (ctxt->value->nodesetval->nodeNr > 1))
13444 ctxt->value->nodesetval->nodeNr = 1;
13445 return (total);
13446 }
13447 }
13448 /*
13449 * Optimization for ()[last()] selection i.e. the last elem
13450 */
13451 if ((op->ch1 != -1) && (op->ch2 != -1) &&
13452 (comp->steps[op->ch1].op == XPATH_OP_SORT) &&
13453 (comp->steps[op->ch2].op == XPATH_OP_SORT)) {
13454 int f = comp->steps[op->ch2].ch1;
13455
13456 if ((f != -1) &&
13457 (comp->steps[f].op == XPATH_OP_FUNCTION) &&
13458 (comp->steps[f].value5 == NULL) &&
13459 (comp->steps[f].value == 0) &&
13460 (comp->steps[f].value4 != NULL) &&
13461 (xmlStrEqual
13462 (comp->steps[f].value4, BAD_CAST "last"))) {
13463 xmlNodePtr last = NULL;
13464
13465 total +=
13466 xmlXPathCompOpEvalLast(ctxt,
13467 &comp->steps[op->ch1],
13468 &last);
13469 CHECK_ERROR0;
13470 /*
13471 * The nodeset should be in document order,
13472 * Keep only the last value
13473 */
13474 if ((ctxt->value != NULL) &&
13475 (ctxt->value->type == XPATH_NODESET) &&
13476 (ctxt->value->nodesetval != NULL) &&
13477 (ctxt->value->nodesetval->nodeTab != NULL) &&
13478 (ctxt->value->nodesetval->nodeNr > 1)) {
13479 ctxt->value->nodesetval->nodeTab[0] =
13480 ctxt->value->nodesetval->nodeTab[ctxt->
13481 value->
13482 nodesetval->
13483 nodeNr -
13484 1];
13485 ctxt->value->nodesetval->nodeNr = 1;
13486 }
13487 return (total);
13488 }
13489 }
13490 /*
13491 * Process inner predicates first.
13492 * Example "index[parent::book][1]":
13493 * ...
13494 * PREDICATE <-- we are here "[1]"
13495 * PREDICATE <-- process "[parent::book]" first
13496 * SORT
13497 * COLLECT 'parent' 'name' 'node' book
13498 * NODE
13499 * ELEM Object is a number : 1
13500 */
13501 if (op->ch1 != -1)
13502 total +=
13503 xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13504 CHECK_ERROR0;
13505 if (op->ch2 == -1)
13506 return (total);
13507 if (ctxt->value == NULL)
13508 return (total);
13509
13510 oldnode = ctxt->context->node;
13511
13512#ifdef LIBXML_XPTR_ENABLED
13513 /*
13514 * Hum are we filtering the result of an XPointer expression
13515 */
13516 if (ctxt->value->type == XPATH_LOCATIONSET) {
13517 xmlLocationSetPtr newlocset = NULL;
13518 xmlLocationSetPtr oldlocset;
13519
13520 /*
13521 * Extract the old locset, and then evaluate the result of the
13522 * expression for all the element in the locset. use it to grow
13523 * up a new locset.
13524 */
13525 CHECK_TYPE0(XPATH_LOCATIONSET);
13526 obj = valuePop(ctxt);
13527 oldlocset = obj->user;
13528 ctxt->context->node = NULL;
13529
13530 if ((oldlocset == NULL) || (oldlocset->locNr == 0)) {
13531 ctxt->context->contextSize = 0;
13532 ctxt->context->proximityPosition = 0;
13533 if (op->ch2 != -1)
13534 total +=
13535 xmlXPathCompOpEval(ctxt,
13536 &comp->steps[op->ch2]);
13537 res = valuePop(ctxt);
13538 if (res != NULL) {
13539 xmlXPathReleaseObject(ctxt->context, res);
13540 }
13541 valuePush(ctxt, obj);
13542 CHECK_ERROR0;
13543 return (total);
13544 }
13545 newlocset = xmlXPtrLocationSetCreate(NULL);
13546
13547 for (i = 0; i < oldlocset->locNr; i++) {
13548 /*
13549 * Run the evaluation with a node list made of a
13550 * single item in the nodelocset.
13551 */
13552 ctxt->context->node = oldlocset->locTab[i]->user;
13553 ctxt->context->contextSize = oldlocset->locNr;
13554 ctxt->context->proximityPosition = i + 1;
13555 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
13556 ctxt->context->node);
13557 valuePush(ctxt, tmp);
13558
13559 if (op->ch2 != -1)
13560 total +=
13561 xmlXPathCompOpEval(ctxt,
13562 &comp->steps[op->ch2]);
13563 if (ctxt->error != XPATH_EXPRESSION_OK) {
13564 xmlXPathFreeObject(obj);
13565 return(0);
13566 }
13567
13568 /*
13569 * The result of the evaluation need to be tested to
13570 * decided whether the filter succeeded or not
13571 */
13572 res = valuePop(ctxt);
13573 if (xmlXPathEvaluatePredicateResult(ctxt, res)) {
13574 xmlXPtrLocationSetAdd(newlocset,
13575 xmlXPathObjectCopy
13576 (oldlocset->locTab[i]));
13577 }
13578
13579 /*
13580 * Cleanup
13581 */
13582 if (res != NULL) {
13583 xmlXPathReleaseObject(ctxt->context, res);
13584 }
13585 if (ctxt->value == tmp) {
13586 res = valuePop(ctxt);
13587 xmlXPathReleaseObject(ctxt->context, res);
13588 }
13589
13590 ctxt->context->node = NULL;
13591 }
13592
13593 /*
13594 * The result is used as the new evaluation locset.
13595 */
13596 xmlXPathReleaseObject(ctxt->context, obj);
13597 ctxt->context->node = NULL;
13598 ctxt->context->contextSize = -1;
13599 ctxt->context->proximityPosition = -1;
13600 valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset));
13601 ctxt->context->node = oldnode;
13602 return (total);
13603 }
13604#endif /* LIBXML_XPTR_ENABLED */
13605
13606 /*
13607 * Extract the old set, and then evaluate the result of the
13608 * expression for all the element in the set. use it to grow
13609 * up a new set.
13610 */
13611 CHECK_TYPE0(XPATH_NODESET);
13612 obj = valuePop(ctxt);
13613 oldset = obj->nodesetval;
13614
13615 oldnode = ctxt->context->node;
13616 oldDoc = ctxt->context->doc;
13617 ctxt->context->node = NULL;
13618
13619 if ((oldset == NULL) || (oldset->nodeNr == 0)) {
13620 ctxt->context->contextSize = 0;
13621 ctxt->context->proximityPosition = 0;
13622/*
13623 if (op->ch2 != -1)
13624 total +=
13625 xmlXPathCompOpEval(ctxt,
13626 &comp->steps[op->ch2]);
13627 CHECK_ERROR0;
13628 res = valuePop(ctxt);
13629 if (res != NULL)
13630 xmlXPathFreeObject(res);
13631*/
13632 valuePush(ctxt, obj);
13633 ctxt->context->node = oldnode;
13634 CHECK_ERROR0;
13635 } else {
13636 tmp = NULL;
13637 /*
13638 * Initialize the new set.
13639 * Also set the xpath document in case things like
13640 * key() evaluation are attempted on the predicate
13641 */
13642 newset = xmlXPathNodeSetCreate(NULL);
13643 /*
13644 * SPEC XPath 1.0:
13645 * "For each node in the node-set to be filtered, the
13646 * PredicateExpr is evaluated with that node as the
13647 * context node, with the number of nodes in the
13648 * node-set as the context size, and with the proximity
13649 * position of the node in the node-set with respect to
13650 * the axis as the context position;"
13651 * @oldset is the node-set" to be filtered.
13652 *
13653 * SPEC XPath 1.0:
13654 * "only predicates change the context position and
13655 * context size (see [2.4 Predicates])."
13656 * Example:
13657 * node-set context pos
13658 * nA 1
13659 * nB 2
13660 * nC 3
13661 * After applying predicate [position() > 1] :
13662 * node-set context pos
13663 * nB 1
13664 * nC 2
13665 *
13666 * removed the first node in the node-set, then
13667 * the context position of the
13668 */
13669 for (i = 0; i < oldset->nodeNr; i++) {
13670 /*
13671 * Run the evaluation with a node list made of
13672 * a single item in the nodeset.
13673 */
13674 ctxt->context->node = oldset->nodeTab[i];
13675 if ((oldset->nodeTab[i]->type != XML_NAMESPACE_DECL) &&
13676 (oldset->nodeTab[i]->doc != NULL))
13677 ctxt->context->doc = oldset->nodeTab[i]->doc;
13678 if (tmp == NULL) {
13679 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
13680 ctxt->context->node);
13681 } else {
13682 xmlXPathNodeSetAddUnique(tmp->nodesetval,
13683 ctxt->context->node);
13684 }
13685 valuePush(ctxt, tmp);
13686 ctxt->context->contextSize = oldset->nodeNr;
13687 ctxt->context->proximityPosition = i + 1;
13688 /*
13689 * Evaluate the predicate against the context node.
13690 * Can/should we optimize position() predicates
13691 * here (e.g. "[1]")?
13692 */
13693 if (op->ch2 != -1)
13694 total +=
13695 xmlXPathCompOpEval(ctxt,
13696 &comp->steps[op->ch2]);
13697 if (ctxt->error != XPATH_EXPRESSION_OK) {
13698 xmlXPathFreeNodeSet(newset);
13699 xmlXPathFreeObject(obj);
13700 return(0);
13701 }
13702
13703 /*
13704 * The result of the evaluation needs to be tested to
13705 * decide whether the filter succeeded or not
13706 */
13707 /*
13708 * OPTIMIZE TODO: Can we use
13709 * xmlXPathNodeSetAdd*Unique()* instead?
13710 */
13711 res = valuePop(ctxt);
13712 if (xmlXPathEvaluatePredicateResult(ctxt, res)) {
13713 xmlXPathNodeSetAdd(newset, oldset->nodeTab[i]);
13714 }
13715
13716 /*
13717 * Cleanup
13718 */
13719 if (res != NULL) {
13720 xmlXPathReleaseObject(ctxt->context, res);
13721 }
13722 if (ctxt->value == tmp) {
13723 valuePop(ctxt);
13724 xmlXPathNodeSetClear(tmp->nodesetval, 1);
13725 /*
13726 * Don't free the temporary nodeset
13727 * in order to avoid massive recreation inside this
13728 * loop.
13729 */
13730 } else
13731 tmp = NULL;
13732 ctxt->context->node = NULL;
13733 }
13734 if (tmp != NULL)
13735 xmlXPathReleaseObject(ctxt->context, tmp);
13736 /*
13737 * The result is used as the new evaluation set.
13738 */
13739 xmlXPathReleaseObject(ctxt->context, obj);
13740 ctxt->context->node = NULL;
13741 ctxt->context->contextSize = -1;
13742 ctxt->context->proximityPosition = -1;
13743 /* may want to move this past the '}' later */
13744 ctxt->context->doc = oldDoc;
13745 valuePush(ctxt,
13746 xmlXPathCacheWrapNodeSet(ctxt->context, newset));
13747 }
13748 ctxt->context->node = oldnode;
13749 return (total);
13750 }
13751 case XPATH_OP_SORT:
13752 if (op->ch1 != -1)
13753 total += xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13754 CHECK_ERROR0;
13755 if ((ctxt->value != NULL) &&
13756 (ctxt->value->type == XPATH_NODESET) &&
13757 (ctxt->value->nodesetval != NULL) &&
13758 (ctxt->value->nodesetval->nodeNr > 1))
13759 {
13760 xmlXPathNodeSetSort(ctxt->value->nodesetval);
13761 }
13762 return (total);
13763#ifdef LIBXML_XPTR_ENABLED
13764 case XPATH_OP_RANGETO:{
13765 xmlXPathObjectPtr range;
13766 xmlXPathObjectPtr res, obj;
13767 xmlXPathObjectPtr tmp;
13768 xmlLocationSetPtr newlocset = NULL;
13769 xmlLocationSetPtr oldlocset;
13770 xmlNodeSetPtr oldset;
13771 int i, j;
13772
13773 if (op->ch1 != -1)
13774 total +=
13775 xmlXPathCompOpEval(ctxt, &comp->steps[op->ch1]);
13776 if (op->ch2 == -1)
13777 return (total);
13778
13779 if (ctxt->value->type == XPATH_LOCATIONSET) {
13780 /*
13781 * Extract the old locset, and then evaluate the result of the
13782 * expression for all the element in the locset. use it to grow
13783 * up a new locset.
13784 */
13785 CHECK_TYPE0(XPATH_LOCATIONSET);
13786 obj = valuePop(ctxt);
13787 oldlocset = obj->user;
13788
13789 if ((oldlocset == NULL) || (oldlocset->locNr == 0)) {
13790 ctxt->context->node = NULL;
13791 ctxt->context->contextSize = 0;
13792 ctxt->context->proximityPosition = 0;
13793 total += xmlXPathCompOpEval(ctxt,&comp->steps[op->ch2]);
13794 res = valuePop(ctxt);
13795 if (res != NULL) {
13796 xmlXPathReleaseObject(ctxt->context, res);
13797 }
13798 valuePush(ctxt, obj);
13799 CHECK_ERROR0;
13800 return (total);
13801 }
13802 newlocset = xmlXPtrLocationSetCreate(NULL);
13803
13804 for (i = 0; i < oldlocset->locNr; i++) {
13805 /*
13806 * Run the evaluation with a node list made of a
13807 * single item in the nodelocset.
13808 */
13809 ctxt->context->node = oldlocset->locTab[i]->user;
13810 ctxt->context->contextSize = oldlocset->locNr;
13811 ctxt->context->proximityPosition = i + 1;
13812 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
13813 ctxt->context->node);
13814 valuePush(ctxt, tmp);
13815
13816 if (op->ch2 != -1)
13817 total +=
13818 xmlXPathCompOpEval(ctxt,
13819 &comp->steps[op->ch2]);
13820 if (ctxt->error != XPATH_EXPRESSION_OK) {
13821 xmlXPathFreeObject(obj);
13822 return(0);
13823 }
13824
13825 res = valuePop(ctxt);
13826 if (res->type == XPATH_LOCATIONSET) {
13827 xmlLocationSetPtr rloc =
13828 (xmlLocationSetPtr)res->user;
13829 for (j=0; j<rloc->locNr; j++) {
13830 range = xmlXPtrNewRange(
13831 oldlocset->locTab[i]->user,
13832 oldlocset->locTab[i]->index,
13833 rloc->locTab[j]->user2,
13834 rloc->locTab[j]->index2);
13835 if (range != NULL) {
13836 xmlXPtrLocationSetAdd(newlocset, range);
13837 }
13838 }
13839 } else {
13840 range = xmlXPtrNewRangeNodeObject(
13841 (xmlNodePtr)oldlocset->locTab[i]->user, res);
13842 if (range != NULL) {
13843 xmlXPtrLocationSetAdd(newlocset,range);
13844 }
13845 }
13846
13847 /*
13848 * Cleanup
13849 */
13850 if (res != NULL) {
13851 xmlXPathReleaseObject(ctxt->context, res);
13852 }
13853 if (ctxt->value == tmp) {
13854 res = valuePop(ctxt);
13855 xmlXPathReleaseObject(ctxt->context, res);
13856 }
13857
13858 ctxt->context->node = NULL;
13859 }
13860 } else { /* Not a location set */
13861 CHECK_TYPE0(XPATH_NODESET);
13862 obj = valuePop(ctxt);
13863 oldset = obj->nodesetval;
13864 ctxt->context->node = NULL;
13865
13866 newlocset = xmlXPtrLocationSetCreate(NULL);
13867
13868 if (oldset != NULL) {
13869 for (i = 0; i < oldset->nodeNr; i++) {
13870 /*
13871 * Run the evaluation with a node list made of a single item
13872 * in the nodeset.
13873 */
13874 ctxt->context->node = oldset->nodeTab[i];
13875 /*
13876 * OPTIMIZE TODO: Avoid recreation for every iteration.
13877 */
13878 tmp = xmlXPathCacheNewNodeSet(ctxt->context,
13879 ctxt->context->node);
13880 valuePush(ctxt, tmp);
13881
13882 if (op->ch2 != -1)
13883 total +=
13884 xmlXPathCompOpEval(ctxt,
13885 &comp->steps[op->ch2]);
13886 if (ctxt->error != XPATH_EXPRESSION_OK) {
13887 xmlXPathFreeObject(obj);
13888 return(0);
13889 }
13890
13891 res = valuePop(ctxt);
13892 range =
13893 xmlXPtrNewRangeNodeObject(oldset->nodeTab[i],
13894 res);
13895 if (range != NULL) {
13896 xmlXPtrLocationSetAdd(newlocset, range);
13897 }
13898
13899 /*
13900 * Cleanup
13901 */
13902 if (res != NULL) {
13903 xmlXPathReleaseObject(ctxt->context, res);
13904 }
13905 if (ctxt->value == tmp) {
13906 res = valuePop(ctxt);
13907 xmlXPathReleaseObject(ctxt->context, res);
13908 }
13909
13910 ctxt->context->node = NULL;
13911 }
13912 }
13913 }
13914
13915 /*
13916 * The result is used as the new evaluation set.
13917 */
13918 xmlXPathReleaseObject(ctxt->context, obj);
13919 ctxt->context->node = NULL;
13920 ctxt->context->contextSize = -1;
13921 ctxt->context->proximityPosition = -1;
13922 valuePush(ctxt, xmlXPtrWrapLocationSet(newlocset));
13923 return (total);
13924 }
13925#endif /* LIBXML_XPTR_ENABLED */
13926 }
13927 xmlGenericError(xmlGenericErrorContext,
13928 "XPath: unknown precompiled operation %d\n", op->op);
13929 return (total);
13930}
13931
13932/**
13933 * xmlXPathCompOpEvalToBoolean:
13934 * @ctxt: the XPath parser context
13935 *
13936 * Evaluates if the expression evaluates to true.
13937 *
13938 * Returns 1 if true, 0 if false and -1 on API or internal errors.
13939 */
13940static int
13941xmlXPathCompOpEvalToBoolean(xmlXPathParserContextPtr ctxt,
13942 xmlXPathStepOpPtr op,
13943 int isPredicate)
13944{
13945 xmlXPathObjectPtr resObj = NULL;
13946
13947start:
13948 /* comp = ctxt->comp; */
13949 switch (op->op) {
13950 case XPATH_OP_END:
13951 return (0);
13952 case XPATH_OP_VALUE:
13953 resObj = (xmlXPathObjectPtr) op->value4;
13954 if (isPredicate)
13955 return(xmlXPathEvaluatePredicateResult(ctxt, resObj));
13956 return(xmlXPathCastToBoolean(resObj));
13957 case XPATH_OP_SORT:
13958 /*
13959 * We don't need sorting for boolean results. Skip this one.
13960 */
13961 if (op->ch1 != -1) {
13962 op = &ctxt->comp->steps[op->ch1];
13963 goto start;
13964 }
13965 return(0);
13966 case XPATH_OP_COLLECT:
13967 if (op->ch1 == -1)
13968 return(0);
13969
13970 xmlXPathCompOpEval(ctxt, &ctxt->comp->steps[op->ch1]);
13971 if (ctxt->error != XPATH_EXPRESSION_OK)
13972 return(-1);
13973
13974 xmlXPathNodeCollectAndTest(ctxt, op, NULL, NULL, 1);
13975 if (ctxt->error != XPATH_EXPRESSION_OK)
13976 return(-1);
13977
13978 resObj = valuePop(ctxt);
13979 if (resObj == NULL)
13980 return(-1);
13981 break;
13982 default:
13983 /*
13984 * Fallback to call xmlXPathCompOpEval().
13985 */
13986 xmlXPathCompOpEval(ctxt, op);
13987 if (ctxt->error != XPATH_EXPRESSION_OK)
13988 return(-1);
13989
13990 resObj = valuePop(ctxt);
13991 if (resObj == NULL)
13992 return(-1);
13993 break;
13994 }
13995
13996 if (resObj) {
13997 int res;
13998
13999 if (resObj->type == XPATH_BOOLEAN) {
14000 res = resObj->boolval;
14001 } else if (isPredicate) {
14002 /*
14003 * For predicates a result of type "number" is handled
14004 * differently:
14005 * SPEC XPath 1.0:
14006 * "If the result is a number, the result will be converted
14007 * to true if the number is equal to the context position
14008 * and will be converted to false otherwise;"
14009 */
14010 res = xmlXPathEvaluatePredicateResult(ctxt, resObj);
14011 } else {
14012 res = xmlXPathCastToBoolean(resObj);
14013 }
14014 xmlXPathReleaseObject(ctxt->context, resObj);
14015 return(res);
14016 }
14017
14018 return(0);
14019}
14020
14021#ifdef XPATH_STREAMING
14022/**
14023 * xmlXPathRunStreamEval:
14024 * @ctxt: the XPath parser context with the compiled expression
14025 *
14026 * Evaluate the Precompiled Streamable XPath expression in the given context.
14027 */
14028static int
14029xmlXPathRunStreamEval(xmlXPathContextPtr ctxt, xmlPatternPtr comp,
14030 xmlXPathObjectPtr *resultSeq, int toBool)
14031{
14032 int max_depth, min_depth;
14033 int from_root;
14034 int ret, depth;
14035 int eval_all_nodes;
14036 xmlNodePtr cur = NULL, limit = NULL;
14037 xmlStreamCtxtPtr patstream = NULL;
14038
14039 int nb_nodes = 0;
14040
14041 if ((ctxt == NULL) || (comp == NULL))
14042 return(-1);
14043 max_depth = xmlPatternMaxDepth(comp);
14044 if (max_depth == -1)
14045 return(-1);
14046 if (max_depth == -2)
14047 max_depth = 10000;
14048 min_depth = xmlPatternMinDepth(comp);
14049 if (min_depth == -1)
14050 return(-1);
14051 from_root = xmlPatternFromRoot(comp);
14052 if (from_root < 0)
14053 return(-1);
14054#if 0
14055 printf("stream eval: depth %d from root %d\n", max_depth, from_root);
14056#endif
14057
14058 if (! toBool) {
14059 if (resultSeq == NULL)
14060 return(-1);
14061 *resultSeq = xmlXPathCacheNewNodeSet(ctxt, NULL);
14062 if (*resultSeq == NULL)
14063 return(-1);
14064 }
14065
14066 /*
14067 * handle the special cases of "/" amd "." being matched
14068 */
14069 if (min_depth == 0) {
14070 if (from_root) {
14071 /* Select "/" */
14072 if (toBool)
14073 return(1);
14074 xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval,
14075 (xmlNodePtr) ctxt->doc);
14076 } else {
14077 /* Select "self::node()" */
14078 if (toBool)
14079 return(1);
14080 xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, ctxt->node);
14081 }
14082 }
14083 if (max_depth == 0) {
14084 return(0);
14085 }
14086
14087 if (from_root) {
14088 cur = (xmlNodePtr)ctxt->doc;
14089 } else if (ctxt->node != NULL) {
14090 switch (ctxt->node->type) {
14091 case XML_ELEMENT_NODE:
14092 case XML_DOCUMENT_NODE:
14093 case XML_DOCUMENT_FRAG_NODE:
14094 case XML_HTML_DOCUMENT_NODE:
14095#ifdef LIBXML_DOCB_ENABLED
14096 case XML_DOCB_DOCUMENT_NODE:
14097#endif
14098 cur = ctxt->node;
14099 break;
14100 case XML_ATTRIBUTE_NODE:
14101 case XML_TEXT_NODE:
14102 case XML_CDATA_SECTION_NODE:
14103 case XML_ENTITY_REF_NODE:
14104 case XML_ENTITY_NODE:
14105 case XML_PI_NODE:
14106 case XML_COMMENT_NODE:
14107 case XML_NOTATION_NODE:
14108 case XML_DTD_NODE:
14109 case XML_DOCUMENT_TYPE_NODE:
14110 case XML_ELEMENT_DECL:
14111 case XML_ATTRIBUTE_DECL:
14112 case XML_ENTITY_DECL:
14113 case XML_NAMESPACE_DECL:
14114 case XML_XINCLUDE_START:
14115 case XML_XINCLUDE_END:
14116 break;
14117 }
14118 limit = cur;
14119 }
14120 if (cur == NULL) {
14121 return(0);
14122 }
14123
14124 patstream = xmlPatternGetStreamCtxt(comp);
14125 if (patstream == NULL) {
14126 /*
14127 * QUESTION TODO: Is this an error?
14128 */
14129 return(0);
14130 }
14131
14132 eval_all_nodes = xmlStreamWantsAnyNode(patstream);
14133
14134 if (from_root) {
14135 ret = xmlStreamPush(patstream, NULL, NULL);
14136 if (ret < 0) {
14137 } else if (ret == 1) {
14138 if (toBool)
14139 goto return_1;
14140 xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, cur);
14141 }
14142 }
14143 depth = 0;
14144 goto scan_children;
14145next_node:
14146 do {
14147 nb_nodes++;
14148
14149 switch (cur->type) {
14150 case XML_ELEMENT_NODE:
14151 case XML_TEXT_NODE:
14152 case XML_CDATA_SECTION_NODE:
14153 case XML_COMMENT_NODE:
14154 case XML_PI_NODE:
14155 if (cur->type == XML_ELEMENT_NODE) {
14156 ret = xmlStreamPush(patstream, cur->name,
14157 (cur->ns ? cur->ns->href : NULL));
14158 } else if (eval_all_nodes)
14159 ret = xmlStreamPushNode(patstream, NULL, NULL, cur->type);
14160 else
14161 break;
14162
14163 if (ret < 0) {
14164 /* NOP. */
14165 } else if (ret == 1) {
14166 if (toBool)
14167 goto return_1;
14168 xmlXPathNodeSetAddUnique((*resultSeq)->nodesetval, cur);
14169 }
14170 if ((cur->children == NULL) || (depth >= max_depth)) {
14171 ret = xmlStreamPop(patstream);
14172 while (cur->next != NULL) {
14173 cur = cur->next;
14174 if ((cur->type != XML_ENTITY_DECL) &&
14175 (cur->type != XML_DTD_NODE))
14176 goto next_node;
14177 }
14178 }
14179 default:
14180 break;
14181 }
14182
14183scan_children:
14184 if ((cur->children != NULL) && (depth < max_depth)) {
14185 /*
14186 * Do not descend on entities declarations
14187 */
14188 if (cur->children->type != XML_ENTITY_DECL) {
14189 cur = cur->children;
14190 depth++;
14191 /*
14192 * Skip DTDs
14193 */
14194 if (cur->type != XML_DTD_NODE)
14195 continue;
14196 }
14197 }
14198
14199 if (cur == limit)
14200 break;
14201
14202 while (cur->next != NULL) {
14203 cur = cur->next;
14204 if ((cur->type != XML_ENTITY_DECL) &&
14205 (cur->type != XML_DTD_NODE))
14206 goto next_node;
14207 }
14208
14209 do {
14210 cur = cur->parent;
14211 depth--;
14212 if ((cur == NULL) || (cur == limit))
14213 goto done;
14214 if (cur->type == XML_ELEMENT_NODE) {
14215 ret = xmlStreamPop(patstream);
14216 } else if ((eval_all_nodes) &&
14217 ((cur->type == XML_TEXT_NODE) ||
14218 (cur->type == XML_CDATA_SECTION_NODE) ||
14219 (cur->type == XML_COMMENT_NODE) ||
14220 (cur->type == XML_PI_NODE)))
14221 {
14222 ret = xmlStreamPop(patstream);
14223 }
14224 if (cur->next != NULL) {
14225 cur = cur->next;
14226 break;
14227 }
14228 } while (cur != NULL);
14229
14230 } while ((cur != NULL) && (depth >= 0));
14231
14232done:
14233
14234#if 0
14235 printf("stream eval: checked %d nodes selected %d\n",
14236 nb_nodes, retObj->nodesetval->nodeNr);
14237#endif
14238
14239 if (patstream)
14240 xmlFreeStreamCtxt(patstream);
14241 return(0);
14242
14243return_1:
14244 if (patstream)
14245 xmlFreeStreamCtxt(patstream);
14246 return(1);
14247}
14248#endif /* XPATH_STREAMING */
14249
14250/**
14251 * xmlXPathRunEval:
14252 * @ctxt: the XPath parser context with the compiled expression
14253 * @toBool: evaluate to a boolean result
14254 *
14255 * Evaluate the Precompiled XPath expression in the given context.
14256 */
14257static int
14258xmlXPathRunEval(xmlXPathParserContextPtr ctxt, int toBool)
14259{
14260 xmlXPathCompExprPtr comp;
14261
14262 if ((ctxt == NULL) || (ctxt->comp == NULL))
14263 return(-1);
14264
14265 if (ctxt->valueTab == NULL) {
14266 /* Allocate the value stack */
14267 ctxt->valueTab = (xmlXPathObjectPtr *)
14268 xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
14269 if (ctxt->valueTab == NULL) {
14270 xmlXPathPErrMemory(ctxt, "creating evaluation context\n");
14271 xmlFree(ctxt);
14272 }
14273 ctxt->valueNr = 0;
14274 ctxt->valueMax = 10;
14275 ctxt->value = NULL;
14276 }
14277#ifdef XPATH_STREAMING
14278 if (ctxt->comp->stream) {
14279 int res;
14280
14281 if (toBool) {
14282 /*
14283 * Evaluation to boolean result.
14284 */
14285 res = xmlXPathRunStreamEval(ctxt->context,
14286 ctxt->comp->stream, NULL, 1);
14287 if (res != -1)
14288 return(res);
14289 } else {
14290 xmlXPathObjectPtr resObj = NULL;
14291
14292 /*
14293 * Evaluation to a sequence.
14294 */
14295 res = xmlXPathRunStreamEval(ctxt->context,
14296 ctxt->comp->stream, &resObj, 0);
14297
14298 if ((res != -1) && (resObj != NULL)) {
14299 valuePush(ctxt, resObj);
14300 return(0);
14301 }
14302 if (resObj != NULL)
14303 xmlXPathReleaseObject(ctxt->context, resObj);
14304 }
14305 /*
14306 * QUESTION TODO: This falls back to normal XPath evaluation
14307 * if res == -1. Is this intended?
14308 */
14309 }
14310#endif
14311 comp = ctxt->comp;
14312 if (comp->last < 0) {
14313 xmlGenericError(xmlGenericErrorContext,
14314 "xmlXPathRunEval: last is less than zero\n");
14315 return(-1);
14316 }
14317 if (toBool)
14318 return(xmlXPathCompOpEvalToBoolean(ctxt,
14319 &comp->steps[comp->last], 0));
14320 else
14321 xmlXPathCompOpEval(ctxt, &comp->steps[comp->last]);
14322
14323 return(0);
14324}
14325
14326/************************************************************************
14327 * *
14328 * Public interfaces *
14329 * *
14330 ************************************************************************/
14331
14332/**
14333 * xmlXPathEvalPredicate:
14334 * @ctxt: the XPath context
14335 * @res: the Predicate Expression evaluation result
14336 *
14337 * Evaluate a predicate result for the current node.
14338 * A PredicateExpr is evaluated by evaluating the Expr and converting
14339 * the result to a boolean. If the result is a number, the result will
14340 * be converted to true if the number is equal to the position of the
14341 * context node in the context node list (as returned by the position
14342 * function) and will be converted to false otherwise; if the result
14343 * is not a number, then the result will be converted as if by a call
14344 * to the boolean function.
14345 *
14346 * Returns 1 if predicate is true, 0 otherwise
14347 */
14348int
14349xmlXPathEvalPredicate(xmlXPathContextPtr ctxt, xmlXPathObjectPtr res) {
14350 if ((ctxt == NULL) || (res == NULL)) return(0);
14351 switch (res->type) {
14352 case XPATH_BOOLEAN:
14353 return(res->boolval);
14354 case XPATH_NUMBER:
14355 return(res->floatval == ctxt->proximityPosition);
14356 case XPATH_NODESET:
14357 case XPATH_XSLT_TREE:
14358 if (res->nodesetval == NULL)
14359 return(0);
14360 return(res->nodesetval->nodeNr != 0);
14361 case XPATH_STRING:
14362 return((res->stringval != NULL) &&
14363 (xmlStrlen(res->stringval) != 0));
14364 default:
14365 STRANGE
14366 }
14367 return(0);
14368}
14369
14370/**
14371 * xmlXPathEvaluatePredicateResult:
14372 * @ctxt: the XPath Parser context
14373 * @res: the Predicate Expression evaluation result
14374 *
14375 * Evaluate a predicate result for the current node.
14376 * A PredicateExpr is evaluated by evaluating the Expr and converting
14377 * the result to a boolean. If the result is a number, the result will
14378 * be converted to true if the number is equal to the position of the
14379 * context node in the context node list (as returned by the position
14380 * function) and will be converted to false otherwise; if the result
14381 * is not a number, then the result will be converted as if by a call
14382 * to the boolean function.
14383 *
14384 * Returns 1 if predicate is true, 0 otherwise
14385 */
14386int
14387xmlXPathEvaluatePredicateResult(xmlXPathParserContextPtr ctxt,
14388 xmlXPathObjectPtr res) {
14389 if ((ctxt == NULL) || (res == NULL)) return(0);
14390 switch (res->type) {
14391 case XPATH_BOOLEAN:
14392 return(res->boolval);
14393 case XPATH_NUMBER:
14394#if defined(__BORLANDC__) || (defined(_MSC_VER) && (_MSC_VER == 1200))
14395 return((res->floatval == ctxt->context->proximityPosition) &&
14396 (!xmlXPathIsNaN(res->floatval))); /* MSC pbm Mark Vakoc !*/
14397#else
14398 return(res->floatval == ctxt->context->proximityPosition);
14399#endif
14400 case XPATH_NODESET:
14401 case XPATH_XSLT_TREE:
14402 if (res->nodesetval == NULL)
14403 return(0);
14404 return(res->nodesetval->nodeNr != 0);
14405 case XPATH_STRING:
14406 return((res->stringval != NULL) && (res->stringval[0] != 0));
14407#ifdef LIBXML_XPTR_ENABLED
14408 case XPATH_LOCATIONSET:{
14409 xmlLocationSetPtr ptr = res->user;
14410 if (ptr == NULL)
14411 return(0);
14412 return (ptr->locNr != 0);
14413 }
14414#endif
14415 default:
14416 STRANGE
14417 }
14418 return(0);
14419}
14420
14421#ifdef XPATH_STREAMING
14422/**
14423 * xmlXPathTryStreamCompile:
14424 * @ctxt: an XPath context
14425 * @str: the XPath expression
14426 *
14427 * Try to compile the XPath expression as a streamable subset.
14428 *
14429 * Returns the compiled expression or NULL if failed to compile.
14430 */
14431static xmlXPathCompExprPtr
14432xmlXPathTryStreamCompile(xmlXPathContextPtr ctxt, const xmlChar *str) {
14433 /*
14434 * Optimization: use streaming patterns when the XPath expression can
14435 * be compiled to a stream lookup
14436 */
14437 xmlPatternPtr stream;
14438 xmlXPathCompExprPtr comp;
14439 xmlDictPtr dict = NULL;
14440 const xmlChar **namespaces = NULL;
14441 xmlNsPtr ns;
14442 int i, j;
14443
14444 if ((!xmlStrchr(str, '[')) && (!xmlStrchr(str, '(')) &&
14445 (!xmlStrchr(str, '@'))) {
14446 const xmlChar *tmp;
14447
14448 /*
14449 * We don't try to handle expressions using the verbose axis
14450 * specifiers ("::"), just the simplied form at this point.
14451 * Additionally, if there is no list of namespaces available and
14452 * there's a ":" in the expression, indicating a prefixed QName,
14453 * then we won't try to compile either. xmlPatterncompile() needs
14454 * to have a list of namespaces at compilation time in order to
14455 * compile prefixed name tests.
14456 */
14457 tmp = xmlStrchr(str, ':');
14458 if ((tmp != NULL) &&
14459 ((ctxt == NULL) || (ctxt->nsNr == 0) || (tmp[1] == ':')))
14460 return(NULL);
14461
14462 if (ctxt != NULL) {
14463 dict = ctxt->dict;
14464 if (ctxt->nsNr > 0) {
14465 namespaces = xmlMalloc(2 * (ctxt->nsNr + 1) * sizeof(xmlChar*));
14466 if (namespaces == NULL) {
14467 xmlXPathErrMemory(ctxt, "allocating namespaces array\n");
14468 return(NULL);
14469 }
14470 for (i = 0, j = 0; (j < ctxt->nsNr); j++) {
14471 ns = ctxt->namespaces[j];
14472 namespaces[i++] = ns->href;
14473 namespaces[i++] = ns->prefix;
14474 }
14475 namespaces[i++] = NULL;
14476 namespaces[i++] = NULL;
14477 }
14478 }
14479
14480 stream = xmlPatterncompile(str, dict, XML_PATTERN_XPATH,
14481 &namespaces[0]);
14482 if (namespaces != NULL) {
14483 xmlFree((xmlChar **)namespaces);
14484 }
14485 if ((stream != NULL) && (xmlPatternStreamable(stream) == 1)) {
14486 comp = xmlXPathNewCompExpr();
14487 if (comp == NULL) {
14488 xmlXPathErrMemory(ctxt, "allocating streamable expression\n");
14489 return(NULL);
14490 }
14491 comp->stream = stream;
14492 comp->dict = dict;
14493 if (comp->dict)
14494 xmlDictReference(comp->dict);
14495 return(comp);
14496 }
14497 xmlFreePattern(stream);
14498 }
14499 return(NULL);
14500}
14501#endif /* XPATH_STREAMING */
14502
14503static int
14504xmlXPathCanRewriteDosExpression(xmlChar *expr)
14505{
14506 if (expr == NULL)
14507 return(0);
14508 do {
14509 if ((*expr == '/') && (*(++expr) == '/'))
14510 return(1);
14511 } while (*expr++);
14512 return(0);
14513}
14514static void
14515xmlXPathRewriteDOSExpression(xmlXPathCompExprPtr comp, xmlXPathStepOpPtr op)
14516{
14517 /*
14518 * Try to rewrite "descendant-or-self::node()/foo" to an optimized
14519 * internal representation.
14520 */
14521 if (op->ch1 != -1) {
14522 if ((op->op == XPATH_OP_COLLECT /* 11 */) &&
14523 ((xmlXPathAxisVal) op->value == AXIS_CHILD /* 4 */) &&
14524 ((xmlXPathTestVal) op->value2 == NODE_TEST_NAME /* 5 */) &&
14525 ((xmlXPathTypeVal) op->value3 == NODE_TYPE_NODE /* 0 */))
14526 {
14527 /*
14528 * This is a "child::foo"
14529 */
14530 xmlXPathStepOpPtr prevop = &comp->steps[op->ch1];
14531
14532 if ((prevop->op == XPATH_OP_COLLECT /* 11 */) &&
14533 (prevop->ch1 != -1) &&
14534 ((xmlXPathAxisVal) prevop->value ==
14535 AXIS_DESCENDANT_OR_SELF) &&
14536 (prevop->ch2 == -1) &&
14537 ((xmlXPathTestVal) prevop->value2 == NODE_TEST_TYPE) &&
14538 ((xmlXPathTypeVal) prevop->value3 == NODE_TYPE_NODE) &&
14539 (comp->steps[prevop->ch1].op == XPATH_OP_ROOT))
14540 {
14541 /*
14542 * This is a "/descendant-or-self::node()" without predicates.
14543 * Eliminate it.
14544 */
14545 op->ch1 = prevop->ch1;
14546 op->rewriteType = XP_REWRITE_DOS_CHILD_ELEM;
14547 }
14548 }
14549 if (op->ch1 != -1)
14550 xmlXPathRewriteDOSExpression(comp, &comp->steps[op->ch1]);
14551 }
14552 if (op->ch2 != -1)
14553 xmlXPathRewriteDOSExpression(comp, &comp->steps[op->ch2]);
14554}
14555
14556/**
14557 * xmlXPathCtxtCompile:
14558 * @ctxt: an XPath context
14559 * @str: the XPath expression
14560 *
14561 * Compile an XPath expression
14562 *
14563 * Returns the xmlXPathCompExprPtr resulting from the compilation or NULL.
14564 * the caller has to free the object.
14565 */
14566xmlXPathCompExprPtr
14567xmlXPathCtxtCompile(xmlXPathContextPtr ctxt, const xmlChar *str) {
14568 xmlXPathParserContextPtr pctxt;
14569 xmlXPathCompExprPtr comp;
14570
14571#ifdef XPATH_STREAMING
14572 comp = xmlXPathTryStreamCompile(ctxt, str);
14573 if (comp != NULL)
14574 return(comp);
14575#endif
14576
14577 xmlXPathInit();
14578
14579 pctxt = xmlXPathNewParserContext(str, ctxt);
14580 if (pctxt == NULL)
14581 return NULL;
14582 xmlXPathCompileExpr(pctxt, 1);
14583
14584 if( pctxt->error != XPATH_EXPRESSION_OK )
14585 {
14586 xmlXPathFreeParserContext(pctxt);
14587 return(NULL);
14588 }
14589
14590 if (*pctxt->cur != 0) {
14591 /*
14592 * aleksey: in some cases this line prints *second* error message
14593 * (see bug #78858) and probably this should be fixed.
14594 * However, we are not sure that all error messages are printed
14595 * out in other places. It's not critical so we leave it as-is for now
14596 */
14597 xmlXPatherror(pctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR);
14598 comp = NULL;
14599 } else {
14600 comp = pctxt->comp;
14601 pctxt->comp = NULL;
14602 }
14603 xmlXPathFreeParserContext(pctxt);
14604
14605 if (comp != NULL) {
14606 comp->expr = xmlStrdup(str);
14607#ifdef DEBUG_EVAL_COUNTS
14608 comp->string = xmlStrdup(str);
14609 comp->nb = 0;
14610#endif
14611 if ((comp->expr != NULL) &&
14612 (comp->nbStep > 2) &&
14613 (comp->last >= 0) &&
14614 (xmlXPathCanRewriteDosExpression(comp->expr) == 1))
14615 {
14616 xmlXPathRewriteDOSExpression(comp, &comp->steps[comp->last]);
14617 }
14618 }
14619 return(comp);
14620}
14621
14622/**
14623 * xmlXPathCompile:
14624 * @str: the XPath expression
14625 *
14626 * Compile an XPath expression
14627 *
14628 * Returns the xmlXPathCompExprPtr resulting from the compilation or NULL.
14629 * the caller has to free the object.
14630 */
14631xmlXPathCompExprPtr
14632xmlXPathCompile(const xmlChar *str) {
14633 return(xmlXPathCtxtCompile(NULL, str));
14634}
14635
14636/**
14637 * xmlXPathCompiledEvalInternal:
14638 * @comp: the compiled XPath expression
14639 * @ctxt: the XPath context
14640 * @resObj: the resulting XPath object or NULL
14641 * @toBool: 1 if only a boolean result is requested
14642 *
14643 * Evaluate the Precompiled XPath expression in the given context.
14644 * The caller has to free @resObj.
14645 *
14646 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
14647 * the caller has to free the object.
14648 */
14649static int
14650xmlXPathCompiledEvalInternal(xmlXPathCompExprPtr comp,
14651 xmlXPathContextPtr ctxt,
14652 xmlXPathObjectPtr *resObj,
14653 int toBool)
14654{
14655 xmlXPathParserContextPtr pctxt;
14656#ifndef LIBXML_THREAD_ENABLED
14657 static int reentance = 0;
14658#endif
14659 int res;
14660
14661 CHECK_CTXT_NEG(ctxt)
14662
14663 if (comp == NULL)
14664 return(-1);
14665 xmlXPathInit();
14666
14667#ifndef LIBXML_THREAD_ENABLED
14668 reentance++;
14669 if (reentance > 1)
14670 xmlXPathDisableOptimizer = 1;
14671#endif
14672
14673#ifdef DEBUG_EVAL_COUNTS
14674 comp->nb++;
14675 if ((comp->string != NULL) && (comp->nb > 100)) {
14676 fprintf(stderr, "100 x %s\n", comp->string);
14677 comp->nb = 0;
14678 }
14679#endif
14680 pctxt = xmlXPathCompParserContext(comp, ctxt);
14681 res = xmlXPathRunEval(pctxt, toBool);
14682
14683 if (resObj) {
14684 if (pctxt->value == NULL) {
14685 xmlGenericError(xmlGenericErrorContext,
14686 "xmlXPathCompiledEval: evaluation failed\n");
14687 *resObj = NULL;
14688 } else {
14689 *resObj = valuePop(pctxt);
14690 }
14691 }
14692
14693 /*
14694 * Pop all remaining objects from the stack.
14695 */
14696 if (pctxt->valueNr > 0) {
14697 xmlXPathObjectPtr tmp;
14698 int stack = 0;
14699
14700 do {
14701 tmp = valuePop(pctxt);
14702 if (tmp != NULL) {
14703 stack++;
14704 xmlXPathReleaseObject(ctxt, tmp);
14705 }
14706 } while (tmp != NULL);
14707 if ((stack != 0) &&
14708 ((toBool) || ((resObj) && (*resObj))))
14709 {
14710 xmlGenericError(xmlGenericErrorContext,
14711 "xmlXPathCompiledEval: %d objects left on the stack.\n",
14712 stack);
14713 }
14714 }
14715
14716 if ((pctxt->error != XPATH_EXPRESSION_OK) && (resObj) && (*resObj)) {
14717 xmlXPathFreeObject(*resObj);
14718 *resObj = NULL;
14719 }
14720 pctxt->comp = NULL;
14721 xmlXPathFreeParserContext(pctxt);
14722#ifndef LIBXML_THREAD_ENABLED
14723 reentance--;
14724#endif
14725
14726 return(res);
14727}
14728
14729/**
14730 * xmlXPathCompiledEval:
14731 * @comp: the compiled XPath expression
14732 * @ctx: the XPath context
14733 *
14734 * Evaluate the Precompiled XPath expression in the given context.
14735 *
14736 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
14737 * the caller has to free the object.
14738 */
14739xmlXPathObjectPtr
14740xmlXPathCompiledEval(xmlXPathCompExprPtr comp, xmlXPathContextPtr ctx)
14741{
14742 xmlXPathObjectPtr res = NULL;
14743
14744 xmlXPathCompiledEvalInternal(comp, ctx, &res, 0);
14745 return(res);
14746}
14747
14748/**
14749 * xmlXPathCompiledEvalToBoolean:
14750 * @comp: the compiled XPath expression
14751 * @ctxt: the XPath context
14752 *
14753 * Applies the XPath boolean() function on the result of the given
14754 * compiled expression.
14755 *
14756 * Returns 1 if the expression evaluated to true, 0 if to false and
14757 * -1 in API and internal errors.
14758 */
14759int
14760xmlXPathCompiledEvalToBoolean(xmlXPathCompExprPtr comp,
14761 xmlXPathContextPtr ctxt)
14762{
14763 return(xmlXPathCompiledEvalInternal(comp, ctxt, NULL, 1));
14764}
14765
14766/**
14767 * xmlXPathEvalExpr:
14768 * @ctxt: the XPath Parser context
14769 *
14770 * Parse and evaluate an XPath expression in the given context,
14771 * then push the result on the context stack
14772 */
14773void
14774xmlXPathEvalExpr(xmlXPathParserContextPtr ctxt) {
14775#ifdef XPATH_STREAMING
14776 xmlXPathCompExprPtr comp;
14777#endif
14778
14779 if (ctxt == NULL) return;
14780
14781#ifdef XPATH_STREAMING
14782 comp = xmlXPathTryStreamCompile(ctxt->context, ctxt->base);
14783 if (comp != NULL) {
14784 if (ctxt->comp != NULL)
14785 xmlXPathFreeCompExpr(ctxt->comp);
14786 ctxt->comp = comp;
14787 if (ctxt->cur != NULL)
14788 while (*ctxt->cur != 0) ctxt->cur++;
14789 } else
14790#endif
14791 {
14792 xmlXPathCompileExpr(ctxt, 1);
14793 /*
14794 * In this scenario the expression string will sit in ctxt->base.
14795 */
14796 if ((ctxt->error == XPATH_EXPRESSION_OK) &&
14797 (ctxt->comp != NULL) &&
14798 (ctxt->base != NULL) &&
14799 (ctxt->comp->nbStep > 2) &&
14800 (ctxt->comp->last >= 0) &&
14801 (xmlXPathCanRewriteDosExpression((xmlChar *) ctxt->base) == 1))
14802 {
14803 xmlXPathRewriteDOSExpression(ctxt->comp,
14804 &ctxt->comp->steps[ctxt->comp->last]);
14805 }
14806 }
14807 CHECK_ERROR;
14808 xmlXPathRunEval(ctxt, 0);
14809}
14810
14811/**
14812 * xmlXPathEval:
14813 * @str: the XPath expression
14814 * @ctx: the XPath context
14815 *
14816 * Evaluate the XPath Location Path in the given context.
14817 *
14818 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
14819 * the caller has to free the object.
14820 */
14821xmlXPathObjectPtr
14822xmlXPathEval(const xmlChar *str, xmlXPathContextPtr ctx) {
14823 xmlXPathParserContextPtr ctxt;
14824 xmlXPathObjectPtr res, tmp, init = NULL;
14825 int stack = 0;
14826
14827 CHECK_CTXT(ctx)
14828
14829 xmlXPathInit();
14830
14831 ctxt = xmlXPathNewParserContext(str, ctx);
14832 if (ctxt == NULL)
14833 return NULL;
14834 xmlXPathEvalExpr(ctxt);
14835
14836 if (ctxt->value == NULL) {
14837 xmlGenericError(xmlGenericErrorContext,
14838 "xmlXPathEval: evaluation failed\n");
14839 res = NULL;
14840 } else if ((*ctxt->cur != 0) && (ctxt->comp != NULL)
14841#ifdef XPATH_STREAMING
14842 && (ctxt->comp->stream == NULL)
14843#endif
14844 ) {
14845 xmlXPatherror(ctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR);
14846 res = NULL;
14847 } else {
14848 res = valuePop(ctxt);
14849 }
14850
14851 do {
14852 tmp = valuePop(ctxt);
14853 if (tmp != NULL) {
14854 if (tmp != init)
14855 stack++;
14856 xmlXPathReleaseObject(ctx, tmp);
14857 }
14858 } while (tmp != NULL);
14859 if ((stack != 0) && (res != NULL)) {
14860 xmlGenericError(xmlGenericErrorContext,
14861 "xmlXPathEval: %d object left on the stack\n",
14862 stack);
14863 }
14864 if (ctxt->error != XPATH_EXPRESSION_OK) {
14865 xmlXPathFreeObject(res);
14866 res = NULL;
14867 }
14868
14869 xmlXPathFreeParserContext(ctxt);
14870 return(res);
14871}
14872
14873/**
14874 * xmlXPathEvalExpression:
14875 * @str: the XPath expression
14876 * @ctxt: the XPath context
14877 *
14878 * Evaluate the XPath expression in the given context.
14879 *
14880 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
14881 * the caller has to free the object.
14882 */
14883xmlXPathObjectPtr
14884xmlXPathEvalExpression(const xmlChar *str, xmlXPathContextPtr ctxt) {
14885 xmlXPathParserContextPtr pctxt;
14886 xmlXPathObjectPtr res, tmp;
14887 int stack = 0;
14888
14889 CHECK_CTXT(ctxt)
14890
14891 xmlXPathInit();
14892
14893 pctxt = xmlXPathNewParserContext(str, ctxt);
14894 if (pctxt == NULL)
14895 return NULL;
14896 xmlXPathEvalExpr(pctxt);
14897
14898 if ((*pctxt->cur != 0) || (pctxt->error != XPATH_EXPRESSION_OK)) {
14899 xmlXPatherror(pctxt, __FILE__, __LINE__, XPATH_EXPR_ERROR);
14900 res = NULL;
14901 } else {
14902 res = valuePop(pctxt);
14903 }
14904 do {
14905 tmp = valuePop(pctxt);
14906 if (tmp != NULL) {
14907 xmlXPathReleaseObject(ctxt, tmp);
14908 stack++;
14909 }
14910 } while (tmp != NULL);
14911 if ((stack != 0) && (res != NULL)) {
14912 xmlGenericError(xmlGenericErrorContext,
14913 "xmlXPathEvalExpression: %d object left on the stack\n",
14914 stack);
14915 }
14916 xmlXPathFreeParserContext(pctxt);
14917 return(res);
14918}
14919
14920/************************************************************************
14921 * *
14922 * Extra functions not pertaining to the XPath spec *
14923 * *
14924 ************************************************************************/
14925/**
14926 * xmlXPathEscapeUriFunction:
14927 * @ctxt: the XPath Parser context
14928 * @nargs: the number of arguments
14929 *
14930 * Implement the escape-uri() XPath function
14931 * string escape-uri(string $str, bool $escape-reserved)
14932 *
14933 * This function applies the URI escaping rules defined in section 2 of [RFC
14934 * 2396] to the string supplied as $uri-part, which typically represents all
14935 * or part of a URI. The effect of the function is to replace any special
14936 * character in the string by an escape sequence of the form %xx%yy...,
14937 * where xxyy... is the hexadecimal representation of the octets used to
14938 * represent the character in UTF-8.
14939 *
14940 * The set of characters that are escaped depends on the setting of the
14941 * boolean argument $escape-reserved.
14942 *
14943 * If $escape-reserved is true, all characters are escaped other than lower
14944 * case letters a-z, upper case letters A-Z, digits 0-9, and the characters
14945 * referred to in [RFC 2396] as "marks": specifically, "-" | "_" | "." | "!"
14946 * | "~" | "*" | "'" | "(" | ")". The "%" character itself is escaped only
14947 * if it is not followed by two hexadecimal digits (that is, 0-9, a-f, and
14948 * A-F).
14949 *
14950 * If $escape-reserved is false, the behavior differs in that characters
14951 * referred to in [RFC 2396] as reserved characters are not escaped. These
14952 * characters are ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ",".
14953 *
14954 * [RFC 2396] does not define whether escaped URIs should use lower case or
14955 * upper case for hexadecimal digits. To ensure that escaped URIs can be
14956 * compared using string comparison functions, this function must always use
14957 * the upper-case letters A-F.
14958 *
14959 * Generally, $escape-reserved should be set to true when escaping a string
14960 * that is to form a single part of a URI, and to false when escaping an
14961 * entire URI or URI reference.
14962 *
14963 * In the case of non-ascii characters, the string is encoded according to
14964 * utf-8 and then converted according to RFC 2396.
14965 *
14966 * Examples
14967 * xf:escape-uri ("gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles#ocean"), true())
14968 * returns "gopher%3A%2F%2Fspinaltap.micro.umn.edu%2F00%2FWeather%2FCalifornia%2FLos%20Angeles%23ocean"
14969 * xf:escape-uri ("gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles#ocean"), false())
14970 * returns "gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles%23ocean"
14971 *
14972 */
14973static void
14974xmlXPathEscapeUriFunction(xmlXPathParserContextPtr ctxt, int nargs) {
14975 xmlXPathObjectPtr str;
14976 int escape_reserved;
14977 xmlBufferPtr target;
14978 xmlChar *cptr;
14979 xmlChar escape[4];
14980
14981 CHECK_ARITY(2);
14982
14983 escape_reserved = xmlXPathPopBoolean(ctxt);
14984
14985 CAST_TO_STRING;
14986 str = valuePop(ctxt);
14987
14988 target = xmlBufferCreate();
14989
14990 escape[0] = '%';
14991 escape[3] = 0;
14992
14993 if (target) {
14994 for (cptr = str->stringval; *cptr; cptr++) {
14995 if ((*cptr >= 'A' && *cptr <= 'Z') ||
14996 (*cptr >= 'a' && *cptr <= 'z') ||
14997 (*cptr >= '0' && *cptr <= '9') ||
14998 *cptr == '-' || *cptr == '_' || *cptr == '.' ||
14999 *cptr == '!' || *cptr == '~' || *cptr == '*' ||
15000 *cptr == '\''|| *cptr == '(' || *cptr == ')' ||
15001 (*cptr == '%' &&
15002 ((cptr[1] >= 'A' && cptr[1] <= 'F') ||
15003 (cptr[1] >= 'a' && cptr[1] <= 'f') ||
15004 (cptr[1] >= '0' && cptr[1] <= '9')) &&
15005 ((cptr[2] >= 'A' && cptr[2] <= 'F') ||
15006 (cptr[2] >= 'a' && cptr[2] <= 'f') ||
15007 (cptr[2] >= '0' && cptr[2] <= '9'))) ||
15008 (!escape_reserved &&
15009 (*cptr == ';' || *cptr == '/' || *cptr == '?' ||
15010 *cptr == ':' || *cptr == '@' || *cptr == '&' ||
15011 *cptr == '=' || *cptr == '+' || *cptr == '$' ||
15012 *cptr == ','))) {
15013 xmlBufferAdd(target, cptr, 1);
15014 } else {
15015 if ((*cptr >> 4) < 10)
15016 escape[1] = '0' + (*cptr >> 4);
15017 else
15018 escape[1] = 'A' - 10 + (*cptr >> 4);
15019 if ((*cptr & 0xF) < 10)
15020 escape[2] = '0' + (*cptr & 0xF);
15021 else
15022 escape[2] = 'A' - 10 + (*cptr & 0xF);
15023
15024 xmlBufferAdd(target, &escape[0], 3);
15025 }
15026 }
15027 }
15028 valuePush(ctxt, xmlXPathCacheNewString(ctxt->context,
15029 xmlBufferContent(target)));
15030 xmlBufferFree(target);
15031 xmlXPathReleaseObject(ctxt->context, str);
15032}
15033
15034/**
15035 * xmlXPathRegisterAllFunctions:
15036 * @ctxt: the XPath context
15037 *
15038 * Registers all default XPath functions in this context
15039 */
15040void
15041xmlXPathRegisterAllFunctions(xmlXPathContextPtr ctxt)
15042{
15043 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"boolean",
15044 xmlXPathBooleanFunction);
15045 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"ceiling",
15046 xmlXPathCeilingFunction);
15047 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"count",
15048 xmlXPathCountFunction);
15049 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"concat",
15050 xmlXPathConcatFunction);
15051 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"contains",
15052 xmlXPathContainsFunction);
15053 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"id",
15054 xmlXPathIdFunction);
15055 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"false",
15056 xmlXPathFalseFunction);
15057 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"floor",
15058 xmlXPathFloorFunction);
15059 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"last",
15060 xmlXPathLastFunction);
15061 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"lang",
15062 xmlXPathLangFunction);
15063 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"local-name",
15064 xmlXPathLocalNameFunction);
15065 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"not",
15066 xmlXPathNotFunction);
15067 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"name",
15068 xmlXPathNameFunction);
15069 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"namespace-uri",
15070 xmlXPathNamespaceURIFunction);
15071 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"normalize-space",
15072 xmlXPathNormalizeFunction);
15073 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"number",
15074 xmlXPathNumberFunction);
15075 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"position",
15076 xmlXPathPositionFunction);
15077 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"round",
15078 xmlXPathRoundFunction);
15079 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"string",
15080 xmlXPathStringFunction);
15081 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"string-length",
15082 xmlXPathStringLengthFunction);
15083 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"starts-with",
15084 xmlXPathStartsWithFunction);
15085 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring",
15086 xmlXPathSubstringFunction);
15087 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring-before",
15088 xmlXPathSubstringBeforeFunction);
15089 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"substring-after",
15090 xmlXPathSubstringAfterFunction);
15091 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"sum",
15092 xmlXPathSumFunction);
15093 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"true",
15094 xmlXPathTrueFunction);
15095 xmlXPathRegisterFunc(ctxt, (const xmlChar *)"translate",
15096 xmlXPathTranslateFunction);
15097
15098 xmlXPathRegisterFuncNS(ctxt, (const xmlChar *)"escape-uri",
15099 (const xmlChar *)"http://www.w3.org/2002/08/xquery-functions",
15100 xmlXPathEscapeUriFunction);
15101}
15102
15103#endif /* LIBXML_XPATH_ENABLED */
15104#define bottom_xpath
15105#include "elfgcchack.h"
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