HTMLtree.c@ 61378

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libxml 2.9.2 unmodified
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1	/*
2	* HTMLtree.c : implementation of access function for an HTML tree.
3	*
4	* See Copyright for the status of this software.
5	*
6	* [email protected]
7	*/
8
9
10	#define IN_LIBXML
11	#include "libxml.h"
12	#ifdef LIBXML_HTML_ENABLED
13
14	#include <string.h> /* for memset() only ! */
15
16	#ifdef HAVE_CTYPE_H
17	#include <ctype.h>
18	#endif
19	#ifdef HAVE_STDLIB_H
20	#include <stdlib.h>
21	#endif
22
23	#include <libxml/xmlmemory.h>
24	#include <libxml/HTMLparser.h>
25	#include <libxml/HTMLtree.h>
26	#include <libxml/entities.h>
27	#include <libxml/valid.h>
28	#include <libxml/xmlerror.h>
29	#include <libxml/parserInternals.h>
30	#include <libxml/globals.h>
31	#include <libxml/uri.h>
32
33	#include "buf.h"
34
35	/************************************************************************
36	* *
37	* Getting/Setting encoding meta tags *
38	* *
39	************************************************************************/
40
41	/**
42	* htmlGetMetaEncoding:
43	* @doc: the document
44	*
45	* Encoding definition lookup in the Meta tags
46	*
47	* Returns the current encoding as flagged in the HTML source
48	*/
49	const xmlChar *
50	htmlGetMetaEncoding(htmlDocPtr doc) {
51	htmlNodePtr cur;
52	const xmlChar *content;
53	const xmlChar *encoding;
54
55	if (doc == NULL)
56	return(NULL);
57	cur = doc->children;
58
59	/*
60	* Search the html
61	*/
62	while (cur != NULL) {
63	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
64	if (xmlStrEqual(cur->name, BAD_CAST"html"))
65	break;
66	if (xmlStrEqual(cur->name, BAD_CAST"head"))
67	goto found_head;
68	if (xmlStrEqual(cur->name, BAD_CAST"meta"))
69	goto found_meta;
70	}
71	cur = cur->next;
72	}
73	if (cur == NULL)
74	return(NULL);
75	cur = cur->children;
76
77	/*
78	* Search the head
79	*/
80	while (cur != NULL) {
81	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
82	if (xmlStrEqual(cur->name, BAD_CAST"head"))
83	break;
84	if (xmlStrEqual(cur->name, BAD_CAST"meta"))
85	goto found_meta;
86	}
87	cur = cur->next;
88	}
89	if (cur == NULL)
90	return(NULL);
91	found_head:
92	cur = cur->children;
93
94	/*
95	* Search the meta elements
96	*/
97	found_meta:
98	while (cur != NULL) {
99	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
100	if (xmlStrEqual(cur->name, BAD_CAST"meta")) {
101	xmlAttrPtr attr = cur->properties;
102	int http;
103	const xmlChar *value;
104
105	content = NULL;
106	http = 0;
107	while (attr != NULL) {
108	if ((attr->children != NULL) &&
109	(attr->children->type == XML_TEXT_NODE) &&
110	(attr->children->next == NULL)) {
111	value = attr->children->content;
112	if ((!xmlStrcasecmp(attr->name, BAD_CAST"http-equiv"))
113	&& (!xmlStrcasecmp(value, BAD_CAST"Content-Type")))
114	http = 1;
115	else if ((value != NULL)
116	&& (!xmlStrcasecmp(attr->name, BAD_CAST"content")))
117	content = value;
118	if ((http != 0) && (content != NULL))
119	goto found_content;
120	}
121	attr = attr->next;
122	}
123	}
124	}
125	cur = cur->next;
126	}
127	return(NULL);
128
129	found_content:
130	encoding = xmlStrstr(content, BAD_CAST"charset=");
131	if (encoding == NULL)
132	encoding = xmlStrstr(content, BAD_CAST"Charset=");
133	if (encoding == NULL)
134	encoding = xmlStrstr(content, BAD_CAST"CHARSET=");
135	if (encoding != NULL) {
136	encoding += 8;
137	} else {
138	encoding = xmlStrstr(content, BAD_CAST"charset =");
139	if (encoding == NULL)
140	encoding = xmlStrstr(content, BAD_CAST"Charset =");
141	if (encoding == NULL)
142	encoding = xmlStrstr(content, BAD_CAST"CHARSET =");
143	if (encoding != NULL)
144	encoding += 9;
145	}
146	if (encoding != NULL) {
147	while ((encoding == ' ') \|\| (encoding == '\t')) encoding++;
148	}
149	return(encoding);
150	}
151
152	/**
153	* htmlSetMetaEncoding:
154	* @doc: the document
155	* @encoding: the encoding string
156	*
157	* Sets the current encoding in the Meta tags
158	* NOTE: this will not change the document content encoding, just
159	* the META flag associated.
160	*
161	* Returns 0 in case of success and -1 in case of error
162	*/
163	int
164	htmlSetMetaEncoding(htmlDocPtr doc, const xmlChar *encoding) {
165	htmlNodePtr cur, meta = NULL, head = NULL;
166	const xmlChar *content = NULL;
167	char newcontent[100];
168
169	newcontent[0] = 0;
170
171	if (doc == NULL)
172	return(-1);
173
174	/* html isn't a real encoding it's just libxml2 way to get entities */
175	if (!xmlStrcasecmp(encoding, BAD_CAST "html"))
176	return(-1);
177
178	if (encoding != NULL) {
179	snprintf(newcontent, sizeof(newcontent), "text/html; charset=%s",
180	(char *)encoding);
181	newcontent[sizeof(newcontent) - 1] = 0;
182	}
183
184	cur = doc->children;
185
186	/*
187	* Search the html
188	*/
189	while (cur != NULL) {
190	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
191	if (xmlStrcasecmp(cur->name, BAD_CAST"html") == 0)
192	break;
193	if (xmlStrcasecmp(cur->name, BAD_CAST"head") == 0)
194	goto found_head;
195	if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0)
196	goto found_meta;
197	}
198	cur = cur->next;
199	}
200	if (cur == NULL)
201	return(-1);
202	cur = cur->children;
203
204	/*
205	* Search the head
206	*/
207	while (cur != NULL) {
208	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
209	if (xmlStrcasecmp(cur->name, BAD_CAST"head") == 0)
210	break;
211	if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0) {
212	head = cur->parent;
213	goto found_meta;
214	}
215	}
216	cur = cur->next;
217	}
218	if (cur == NULL)
219	return(-1);
220	found_head:
221	head = cur;
222	if (cur->children == NULL)
223	goto create;
224	cur = cur->children;
225
226	found_meta:
227	/*
228	* Search and update all the remaining the meta elements carrying
229	* encoding informations
230	*/
231	while (cur != NULL) {
232	if ((cur->type == XML_ELEMENT_NODE) && (cur->name != NULL)) {
233	if (xmlStrcasecmp(cur->name, BAD_CAST"meta") == 0) {
234	xmlAttrPtr attr = cur->properties;
235	int http;
236	const xmlChar *value;
237
238	content = NULL;
239	http = 0;
240	while (attr != NULL) {
241	if ((attr->children != NULL) &&
242	(attr->children->type == XML_TEXT_NODE) &&
243	(attr->children->next == NULL)) {
244	value = attr->children->content;
245	if ((!xmlStrcasecmp(attr->name, BAD_CAST"http-equiv"))
246	&& (!xmlStrcasecmp(value, BAD_CAST"Content-Type")))
247	http = 1;
248	else
249	{
250	if ((value != NULL) &&
251	(!xmlStrcasecmp(attr->name, BAD_CAST"content")))
252	content = value;
253	}
254	if ((http != 0) && (content != NULL))
255	break;
256	}
257	attr = attr->next;
258	}
259	if ((http != 0) && (content != NULL)) {
260	meta = cur;
261	break;
262	}
263
264	}
265	}
266	cur = cur->next;
267	}
268	create:
269	if (meta == NULL) {
270	if ((encoding != NULL) && (head != NULL)) {
271	/*
272	* Create a new Meta element with the right attributes
273	*/
274
275	meta = xmlNewDocNode(doc, NULL, BAD_CAST"meta", NULL);
276	if (head->children == NULL)
277	xmlAddChild(head, meta);
278	else
279	xmlAddPrevSibling(head->children, meta);
280	xmlNewProp(meta, BAD_CAST"http-equiv", BAD_CAST"Content-Type");
281	xmlNewProp(meta, BAD_CAST"content", BAD_CAST newcontent);
282	}
283	} else {
284	/* remove the meta tag if NULL is passed */
285	if (encoding == NULL) {
286	xmlUnlinkNode(meta);
287	xmlFreeNode(meta);
288	}
289	/* change the document only if there is a real encoding change */
290	else if (xmlStrcasestr(content, encoding) == NULL) {
291	xmlSetProp(meta, BAD_CAST"content", BAD_CAST newcontent);
292	}
293	}
294
295
296	return(0);
297	}
298
299	/**
300	* booleanHTMLAttrs:
301	*
302	* These are the HTML attributes which will be output
303	* in minimized form, i.e. <option selected="selected"> will be
304	* output as <option selected>, as per XSLT 1.0 16.2 "HTML Output Method"
305	*
306	*/
307	static const char* htmlBooleanAttrs[] = {
308	"checked", "compact", "declare", "defer", "disabled", "ismap",
309	"multiple", "nohref", "noresize", "noshade", "nowrap", "readonly",
310	"selected", NULL
311	};
312
313
314	/**
315	* htmlIsBooleanAttr:
316	* @name: the name of the attribute to check
317	*
318	* Determine if a given attribute is a boolean attribute.
319	*
320	* returns: false if the attribute is not boolean, true otherwise.
321	*/
322	int
323	htmlIsBooleanAttr(const xmlChar *name)
324	{
325	int i = 0;
326
327	while (htmlBooleanAttrs[i] != NULL) {
328	if (xmlStrcasecmp((const xmlChar *)htmlBooleanAttrs[i], name) == 0)
329	return 1;
330	i++;
331	}
332	return 0;
333	}
334
335	#ifdef LIBXML_OUTPUT_ENABLED
336	/*
337	* private routine exported from xmlIO.c
338	*/
339	xmlOutputBufferPtr
340	xmlAllocOutputBufferInternal(xmlCharEncodingHandlerPtr encoder);
341	/************************************************************************
342	* *
343	* Output error handlers *
344	* *
345	************************************************************************/
346	/**
347	* htmlSaveErrMemory:
348	* @extra: extra informations
349	*
350	* Handle an out of memory condition
351	*/
352	static void
353	htmlSaveErrMemory(const char *extra)
354	{
355	__xmlSimpleError(XML_FROM_OUTPUT, XML_ERR_NO_MEMORY, NULL, NULL, extra);
356	}
357
358	/**
359	* htmlSaveErr:
360	* @code: the error number
361	* @node: the location of the error.
362	* @extra: extra informations
363	*
364	* Handle an out of memory condition
365	*/
366	static void
367	htmlSaveErr(int code, xmlNodePtr node, const char *extra)
368	{
369	const char *msg = NULL;
370
371	switch(code) {
372	case XML_SAVE_NOT_UTF8:
373	msg = "string is not in UTF-8\n";
374	break;
375	case XML_SAVE_CHAR_INVALID:
376	msg = "invalid character value\n";
377	break;
378	case XML_SAVE_UNKNOWN_ENCODING:
379	msg = "unknown encoding %s\n";
380	break;
381	case XML_SAVE_NO_DOCTYPE:
382	msg = "HTML has no DOCTYPE\n";
383	break;
384	default:
385	msg = "unexpected error number\n";
386	}
387	__xmlSimpleError(XML_FROM_OUTPUT, code, node, msg, extra);
388	}
389
390	/************************************************************************
391	* *
392	* Dumping HTML tree content to a simple buffer *
393	* *
394	************************************************************************/
395
396	/**
397	* htmlBufNodeDumpFormat:
398	* @buf: the xmlBufPtr output
399	* @doc: the document
400	* @cur: the current node
401	* @format: should formatting spaces been added
402	*
403	* Dump an HTML node, recursive behaviour,children are printed too.
404	*
405	* Returns the number of byte written or -1 in case of error
406	*/
407	static size_t
408	htmlBufNodeDumpFormat(xmlBufPtr buf, xmlDocPtr doc, xmlNodePtr cur,
409	int format) {
410	size_t use;
411	int ret;
412	xmlOutputBufferPtr outbuf;
413
414	if (cur == NULL) {
415	return (-1);
416	}
417	if (buf == NULL) {
418	return (-1);
419	}
420	outbuf = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));
421	if (outbuf == NULL) {
422	htmlSaveErrMemory("allocating HTML output buffer");
423	return (-1);
424	}
425	memset(outbuf, 0, (size_t) sizeof(xmlOutputBuffer));
426	outbuf->buffer = buf;
427	outbuf->encoder = NULL;
428	outbuf->writecallback = NULL;
429	outbuf->closecallback = NULL;
430	outbuf->context = NULL;
431	outbuf->written = 0;
432
433	use = xmlBufUse(buf);
434	htmlNodeDumpFormatOutput(outbuf, doc, cur, NULL, format);
435	xmlFree(outbuf);
436	ret = xmlBufUse(buf) - use;
437	return (ret);
438	}
439
440	/**
441	* htmlNodeDump:
442	* @buf: the HTML buffer output
443	* @doc: the document
444	* @cur: the current node
445	*
446	* Dump an HTML node, recursive behaviour,children are printed too,
447	* and formatting returns are added.
448	*
449	* Returns the number of byte written or -1 in case of error
450	*/
451	int
452	htmlNodeDump(xmlBufferPtr buf, xmlDocPtr doc, xmlNodePtr cur) {
453	xmlBufPtr buffer;
454	size_t ret;
455
456	if ((buf == NULL) \|\| (cur == NULL))
457	return(-1);
458
459	xmlInitParser();
460	buffer = xmlBufFromBuffer(buf);
461	if (buffer == NULL)
462	return(-1);
463
464	ret = htmlBufNodeDumpFormat(buffer, doc, cur, 1);
465
466	xmlBufBackToBuffer(buffer);
467
468	if (ret > INT_MAX)
469	return(-1);
470	return((int) ret);
471	}
472
473	/**
474	* htmlNodeDumpFileFormat:
475	* @out: the FILE pointer
476	* @doc: the document
477	* @cur: the current node
478	* @encoding: the document encoding
479	* @format: should formatting spaces been added
480	*
481	* Dump an HTML node, recursive behaviour,children are printed too.
482	*
483	* TODO: if encoding == NULL try to save in the doc encoding
484	*
485	* returns: the number of byte written or -1 in case of failure.
486	*/
487	int
488	htmlNodeDumpFileFormat(FILE *out, xmlDocPtr doc,
489	xmlNodePtr cur, const char *encoding, int format) {
490	xmlOutputBufferPtr buf;
491	xmlCharEncodingHandlerPtr handler = NULL;
492	int ret;
493
494	xmlInitParser();
495
496	if (encoding != NULL) {
497	xmlCharEncoding enc;
498
499	enc = xmlParseCharEncoding(encoding);
500	if (enc != XML_CHAR_ENCODING_UTF8) {
501	handler = xmlFindCharEncodingHandler(encoding);
502	if (handler == NULL)
503	htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
504	}
505	}
506
507	/*
508	* Fallback to HTML or ASCII when the encoding is unspecified
509	*/
510	if (handler == NULL)
511	handler = xmlFindCharEncodingHandler("HTML");
512	if (handler == NULL)
513	handler = xmlFindCharEncodingHandler("ascii");
514
515	/*
516	* save the content to a temp buffer.
517	*/
518	buf = xmlOutputBufferCreateFile(out, handler);
519	if (buf == NULL) return(0);
520
521	htmlNodeDumpFormatOutput(buf, doc, cur, encoding, format);
522
523	ret = xmlOutputBufferClose(buf);
524	return(ret);
525	}
526
527	/**
528	* htmlNodeDumpFile:
529	* @out: the FILE pointer
530	* @doc: the document
531	* @cur: the current node
532	*
533	* Dump an HTML node, recursive behaviour,children are printed too,
534	* and formatting returns are added.
535	*/
536	void
537	htmlNodeDumpFile(FILE *out, xmlDocPtr doc, xmlNodePtr cur) {
538	htmlNodeDumpFileFormat(out, doc, cur, NULL, 1);
539	}
540
541	/**
542	* htmlDocDumpMemoryFormat:
543	* @cur: the document
544	* @mem: OUT: the memory pointer
545	* @size: OUT: the memory length
546	* @format: should formatting spaces been added
547	*
548	* Dump an HTML document in memory and return the xmlChar * and it's size.
549	* It's up to the caller to free the memory.
550	*/
551	void
552	htmlDocDumpMemoryFormat(xmlDocPtr cur, xmlChar*mem, int size, int format) {
553	xmlOutputBufferPtr buf;
554	xmlCharEncodingHandlerPtr handler = NULL;
555	const char *encoding;
556
557	xmlInitParser();
558
559	if ((mem == NULL) \|\| (size == NULL))
560	return;
561	if (cur == NULL) {
562	*mem = NULL;
563	*size = 0;
564	return;
565	}
566
567	encoding = (const char *) htmlGetMetaEncoding(cur);
568
569	if (encoding != NULL) {
570	xmlCharEncoding enc;
571
572	enc = xmlParseCharEncoding(encoding);
573	if (enc != cur->charset) {
574	if (cur->charset != XML_CHAR_ENCODING_UTF8) {
575	/*
576	* Not supported yet
577	*/
578	*mem = NULL;
579	*size = 0;
580	return;
581	}
582
583	handler = xmlFindCharEncodingHandler(encoding);
584	if (handler == NULL)
585	htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
586
587	} else {
588	handler = xmlFindCharEncodingHandler(encoding);
589	}
590	}
591
592	/*
593	* Fallback to HTML or ASCII when the encoding is unspecified
594	*/
595	if (handler == NULL)
596	handler = xmlFindCharEncodingHandler("HTML");
597	if (handler == NULL)
598	handler = xmlFindCharEncodingHandler("ascii");
599
600	buf = xmlAllocOutputBufferInternal(handler);
601	if (buf == NULL) {
602	*mem = NULL;
603	*size = 0;
604	return;
605	}
606
607	htmlDocContentDumpFormatOutput(buf, cur, NULL, format);
608
609	xmlOutputBufferFlush(buf);
610	if (buf->conv != NULL) {
611	*size = xmlBufUse(buf->conv);
612	mem = xmlStrndup(xmlBufContent(buf->conv), size);
613	} else {
614	*size = xmlBufUse(buf->buffer);
615	mem = xmlStrndup(xmlBufContent(buf->buffer), size);
616	}
617	(void)xmlOutputBufferClose(buf);
618	}
619
620	/**
621	* htmlDocDumpMemory:
622	* @cur: the document
623	* @mem: OUT: the memory pointer
624	* @size: OUT: the memory length
625	*
626	* Dump an HTML document in memory and return the xmlChar * and it's size.
627	* It's up to the caller to free the memory.
628	*/
629	void
630	htmlDocDumpMemory(xmlDocPtr cur, xmlChar*mem, int size) {
631	htmlDocDumpMemoryFormat(cur, mem, size, 1);
632	}
633
634
635	/************************************************************************
636	* *
637	* Dumping HTML tree content to an I/O output buffer *
638	* *
639	************************************************************************/
640
641	void xmlNsListDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur);
642
643	/**
644	* htmlDtdDumpOutput:
645	* @buf: the HTML buffer output
646	* @doc: the document
647	* @encoding: the encoding string
648	*
649	* TODO: check whether encoding is needed
650	*
651	* Dump the HTML document DTD, if any.
652	*/
653	static void
654	htmlDtdDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,
655	const char *encoding ATTRIBUTE_UNUSED) {
656	xmlDtdPtr cur = doc->intSubset;
657
658	if (cur == NULL) {
659	htmlSaveErr(XML_SAVE_NO_DOCTYPE, (xmlNodePtr) doc, NULL);
660	return;
661	}
662	xmlOutputBufferWriteString(buf, "<!DOCTYPE ");
663	xmlOutputBufferWriteString(buf, (const char *)cur->name);
664	if (cur->ExternalID != NULL) {
665	xmlOutputBufferWriteString(buf, " PUBLIC ");
666	xmlBufWriteQuotedString(buf->buffer, cur->ExternalID);
667	if (cur->SystemID != NULL) {
668	xmlOutputBufferWriteString(buf, " ");
669	xmlBufWriteQuotedString(buf->buffer, cur->SystemID);
670	}
671	} else if (cur->SystemID != NULL) {
672	xmlOutputBufferWriteString(buf, " SYSTEM ");
673	xmlBufWriteQuotedString(buf->buffer, cur->SystemID);
674	}
675	xmlOutputBufferWriteString(buf, ">\n");
676	}
677
678	/**
679	* htmlAttrDumpOutput:
680	* @buf: the HTML buffer output
681	* @doc: the document
682	* @cur: the attribute pointer
683	* @encoding: the encoding string
684	*
685	* Dump an HTML attribute
686	*/
687	static void
688	htmlAttrDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, xmlAttrPtr cur,
689	const char *encoding ATTRIBUTE_UNUSED) {
690	xmlChar *value;
691
692	/*
693	* The html output method should not escape a & character
694	* occurring in an attribute value immediately followed by
695	* a { character (see Section B.7.1 of the HTML 4.0 Recommendation).
696	* This is implemented in xmlEncodeEntitiesReentrant
697	*/
698
699	if (cur == NULL) {
700	return;
701	}
702	xmlOutputBufferWriteString(buf, " ");
703	if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
704	xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
705	xmlOutputBufferWriteString(buf, ":");
706	}
707	xmlOutputBufferWriteString(buf, (const char *)cur->name);
708	if ((cur->children != NULL) && (!htmlIsBooleanAttr(cur->name))) {
709	value = xmlNodeListGetString(doc, cur->children, 0);
710	if (value) {
711	xmlOutputBufferWriteString(buf, "=");
712	if ((cur->ns == NULL) && (cur->parent != NULL) &&
713	(cur->parent->ns == NULL) &&
714	((!xmlStrcasecmp(cur->name, BAD_CAST "href")) \|\|
715	(!xmlStrcasecmp(cur->name, BAD_CAST "action")) \|\|
716	(!xmlStrcasecmp(cur->name, BAD_CAST "src")) \|\|
717	((!xmlStrcasecmp(cur->name, BAD_CAST "name")) &&
718	(!xmlStrcasecmp(cur->parent->name, BAD_CAST "a"))))) {
719	xmlChar *tmp = value;
720	/* xmlURIEscapeStr() escapes '"' so it can be safely used. */
721	xmlBufCCat(buf->buffer, "\"");
722
723	while (IS_BLANK_CH(*tmp)) tmp++;
724
725	/* URI Escape everything, except server side includes. */
726	for ( ; ; ) {
727	xmlChar *escaped;
728	xmlChar endChar;
729	xmlChar *end = NULL;
730	xmlChar start = (xmlChar )xmlStrstr(tmp, BAD_CAST "<!--");
731	if (start != NULL) {
732	end = (xmlChar *)xmlStrstr(tmp, BAD_CAST "-->");
733	if (end != NULL) {
734	*start = '\0';
735	}
736	}
737
738	/* Escape the whole string, or until start (set to '\0'). */
739	escaped = xmlURIEscapeStr(tmp, BAD_CAST"@/:=?;#%&,+");
740	if (escaped != NULL) {
741	xmlBufCat(buf->buffer, escaped);
742	xmlFree(escaped);
743	} else {
744	xmlBufCat(buf->buffer, tmp);
745	}
746
747	if (end == NULL) { /* Everything has been written. */
748	break;
749	}
750
751	/* Do not escape anything within server side includes. */
752	start = '<'; / Restore the first character of "<!--". */
753	end += 3; /* strlen("-->") */
754	endChar = *end;
755	*end = '\0';
756	xmlBufCat(buf->buffer, start);
757	*end = endChar;
758	tmp = end;
759	}
760
761	xmlBufCCat(buf->buffer, "\"");
762	} else {
763	xmlBufWriteQuotedString(buf->buffer, value);
764	}
765	xmlFree(value);
766	} else {
767	xmlOutputBufferWriteString(buf, "=\"\"");
768	}
769	}
770	}
771
772	/**
773	* htmlAttrListDumpOutput:
774	* @buf: the HTML buffer output
775	* @doc: the document
776	* @cur: the first attribute pointer
777	* @encoding: the encoding string
778	*
779	* Dump a list of HTML attributes
780	*/
781	static void
782	htmlAttrListDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc, xmlAttrPtr cur, const char *encoding) {
783	if (cur == NULL) {
784	return;
785	}
786	while (cur != NULL) {
787	htmlAttrDumpOutput(buf, doc, cur, encoding);
788	cur = cur->next;
789	}
790	}
791
792
793
794	/**
795	* htmlNodeListDumpOutput:
796	* @buf: the HTML buffer output
797	* @doc: the document
798	* @cur: the first node
799	* @encoding: the encoding string
800	* @format: should formatting spaces been added
801	*
802	* Dump an HTML node list, recursive behaviour,children are printed too.
803	*/
804	static void
805	htmlNodeListDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,
806	xmlNodePtr cur, const char *encoding, int format) {
807	if (cur == NULL) {
808	return;
809	}
810	while (cur != NULL) {
811	htmlNodeDumpFormatOutput(buf, doc, cur, encoding, format);
812	cur = cur->next;
813	}
814	}
815
816	/**
817	* htmlNodeDumpFormatOutput:
818	* @buf: the HTML buffer output
819	* @doc: the document
820	* @cur: the current node
821	* @encoding: the encoding string
822	* @format: should formatting spaces been added
823	*
824	* Dump an HTML node, recursive behaviour,children are printed too.
825	*/
826	void
827	htmlNodeDumpFormatOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,
828	xmlNodePtr cur, const char *encoding, int format) {
829	const htmlElemDesc * info;
830
831	xmlInitParser();
832
833	if ((cur == NULL) \|\| (buf == NULL)) {
834	return;
835	}
836	/*
837	* Special cases.
838	*/
839	if (cur->type == XML_DTD_NODE)
840	return;
841	if ((cur->type == XML_HTML_DOCUMENT_NODE) \|\|
842	(cur->type == XML_DOCUMENT_NODE)){
843	htmlDocContentDumpOutput(buf, (xmlDocPtr) cur, encoding);
844	return;
845	}
846	if (cur->type == XML_ATTRIBUTE_NODE) {
847	htmlAttrDumpOutput(buf, doc, (xmlAttrPtr) cur, encoding);
848	return;
849	}
850	if (cur->type == HTML_TEXT_NODE) {
851	if (cur->content != NULL) {
852	if (((cur->name == (const xmlChar *)xmlStringText) \|\|
853	(cur->name != (const xmlChar *)xmlStringTextNoenc)) &&
854	((cur->parent == NULL) \|\|
855	((xmlStrcasecmp(cur->parent->name, BAD_CAST "script")) &&
856	(xmlStrcasecmp(cur->parent->name, BAD_CAST "style"))))) {
857	xmlChar *buffer;
858
859	buffer = xmlEncodeEntitiesReentrant(doc, cur->content);
860	if (buffer != NULL) {
861	xmlOutputBufferWriteString(buf, (const char *)buffer);
862	xmlFree(buffer);
863	}
864	} else {
865	xmlOutputBufferWriteString(buf, (const char *)cur->content);
866	}
867	}
868	return;
869	}
870	if (cur->type == HTML_COMMENT_NODE) {
871	if (cur->content != NULL) {
872	xmlOutputBufferWriteString(buf, "<!--");
873	xmlOutputBufferWriteString(buf, (const char *)cur->content);
874	xmlOutputBufferWriteString(buf, "-->");
875	}
876	return;
877	}
878	if (cur->type == HTML_PI_NODE) {
879	if (cur->name == NULL)
880	return;
881	xmlOutputBufferWriteString(buf, "<?");
882	xmlOutputBufferWriteString(buf, (const char *)cur->name);
883	if (cur->content != NULL) {
884	xmlOutputBufferWriteString(buf, " ");
885	xmlOutputBufferWriteString(buf, (const char *)cur->content);
886	}
887	xmlOutputBufferWriteString(buf, ">");
888	return;
889	}
890	if (cur->type == HTML_ENTITY_REF_NODE) {
891	xmlOutputBufferWriteString(buf, "&");
892	xmlOutputBufferWriteString(buf, (const char *)cur->name);
893	xmlOutputBufferWriteString(buf, ";");
894	return;
895	}
896	if (cur->type == HTML_PRESERVE_NODE) {
897	if (cur->content != NULL) {
898	xmlOutputBufferWriteString(buf, (const char *)cur->content);
899	}
900	return;
901	}
902
903	/*
904	* Get specific HTML info for that node.
905	*/
906	if (cur->ns == NULL)
907	info = htmlTagLookup(cur->name);
908	else
909	info = NULL;
910
911	xmlOutputBufferWriteString(buf, "<");
912	if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
913	xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
914	xmlOutputBufferWriteString(buf, ":");
915	}
916	xmlOutputBufferWriteString(buf, (const char *)cur->name);
917	if (cur->nsDef)
918	xmlNsListDumpOutput(buf, cur->nsDef);
919	if (cur->properties != NULL)
920	htmlAttrListDumpOutput(buf, doc, cur->properties, encoding);
921
922	if ((info != NULL) && (info->empty)) {
923	xmlOutputBufferWriteString(buf, ">");
924	if ((format) && (!info->isinline) && (cur->next != NULL)) {
925	if ((cur->next->type != HTML_TEXT_NODE) &&
926	(cur->next->type != HTML_ENTITY_REF_NODE) &&
927	(cur->parent != NULL) &&
928	(cur->parent->name != NULL) &&
929	(cur->parent->name[0] != 'p')) /* p, pre, param */
930	xmlOutputBufferWriteString(buf, "\n");
931	}
932	return;
933	}
934	if (((cur->type == XML_ELEMENT_NODE) \|\| (cur->content == NULL)) &&
935	(cur->children == NULL)) {
936	if ((info != NULL) && (info->saveEndTag != 0) &&
937	(xmlStrcmp(BAD_CAST info->name, BAD_CAST "html")) &&
938	(xmlStrcmp(BAD_CAST info->name, BAD_CAST "body"))) {
939	xmlOutputBufferWriteString(buf, ">");
940	} else {
941	xmlOutputBufferWriteString(buf, "></");
942	if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
943	xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
944	xmlOutputBufferWriteString(buf, ":");
945	}
946	xmlOutputBufferWriteString(buf, (const char *)cur->name);
947	xmlOutputBufferWriteString(buf, ">");
948	}
949	if ((format) && (cur->next != NULL) &&
950	(info != NULL) && (!info->isinline)) {
951	if ((cur->next->type != HTML_TEXT_NODE) &&
952	(cur->next->type != HTML_ENTITY_REF_NODE) &&
953	(cur->parent != NULL) &&
954	(cur->parent->name != NULL) &&
955	(cur->parent->name[0] != 'p')) /* p, pre, param */
956	xmlOutputBufferWriteString(buf, "\n");
957	}
958	return;
959	}
960	xmlOutputBufferWriteString(buf, ">");
961	if ((cur->type != XML_ELEMENT_NODE) &&
962	(cur->content != NULL)) {
963	/*
964	* Uses the OutputBuffer property to automatically convert
965	* invalids to charrefs
966	*/
967
968	xmlOutputBufferWriteString(buf, (const char *) cur->content);
969	}
970	if (cur->children != NULL) {
971	if ((format) && (info != NULL) && (!info->isinline) &&
972	(cur->children->type != HTML_TEXT_NODE) &&
973	(cur->children->type != HTML_ENTITY_REF_NODE) &&
974	(cur->children != cur->last) &&
975	(cur->name != NULL) &&
976	(cur->name[0] != 'p')) /* p, pre, param */
977	xmlOutputBufferWriteString(buf, "\n");
978	htmlNodeListDumpOutput(buf, doc, cur->children, encoding, format);
979	if ((format) && (info != NULL) && (!info->isinline) &&
980	(cur->last->type != HTML_TEXT_NODE) &&
981	(cur->last->type != HTML_ENTITY_REF_NODE) &&
982	(cur->children != cur->last) &&
983	(cur->name != NULL) &&
984	(cur->name[0] != 'p')) /* p, pre, param */
985	xmlOutputBufferWriteString(buf, "\n");
986	}
987	xmlOutputBufferWriteString(buf, "</");
988	if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
989	xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
990	xmlOutputBufferWriteString(buf, ":");
991	}
992	xmlOutputBufferWriteString(buf, (const char *)cur->name);
993	xmlOutputBufferWriteString(buf, ">");
994	if ((format) && (info != NULL) && (!info->isinline) &&
995	(cur->next != NULL)) {
996	if ((cur->next->type != HTML_TEXT_NODE) &&
997	(cur->next->type != HTML_ENTITY_REF_NODE) &&
998	(cur->parent != NULL) &&
999	(cur->parent->name != NULL) &&
1000	(cur->parent->name[0] != 'p')) /* p, pre, param */
1001	xmlOutputBufferWriteString(buf, "\n");
1002	}
1003	}
1004
1005	/**
1006	* htmlNodeDumpOutput:
1007	* @buf: the HTML buffer output
1008	* @doc: the document
1009	* @cur: the current node
1010	* @encoding: the encoding string
1011	*
1012	* Dump an HTML node, recursive behaviour,children are printed too,
1013	* and formatting returns/spaces are added.
1014	*/
1015	void
1016	htmlNodeDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr doc,
1017	xmlNodePtr cur, const char *encoding) {
1018	htmlNodeDumpFormatOutput(buf, doc, cur, encoding, 1);
1019	}
1020
1021	/**
1022	* htmlDocContentDumpFormatOutput:
1023	* @buf: the HTML buffer output
1024	* @cur: the document
1025	* @encoding: the encoding string
1026	* @format: should formatting spaces been added
1027	*
1028	* Dump an HTML document.
1029	*/
1030	void
1031	htmlDocContentDumpFormatOutput(xmlOutputBufferPtr buf, xmlDocPtr cur,
1032	const char *encoding, int format) {
1033	int type;
1034
1035	xmlInitParser();
1036
1037	if ((buf == NULL) \|\| (cur == NULL))
1038	return;
1039
1040	/*
1041	* force to output the stuff as HTML, especially for entities
1042	*/
1043	type = cur->type;
1044	cur->type = XML_HTML_DOCUMENT_NODE;
1045	if (cur->intSubset != NULL) {
1046	htmlDtdDumpOutput(buf, cur, NULL);
1047	}
1048	if (cur->children != NULL) {
1049	htmlNodeListDumpOutput(buf, cur, cur->children, encoding, format);
1050	}
1051	xmlOutputBufferWriteString(buf, "\n");
1052	cur->type = (xmlElementType) type;
1053	}
1054
1055	/**
1056	* htmlDocContentDumpOutput:
1057	* @buf: the HTML buffer output
1058	* @cur: the document
1059	* @encoding: the encoding string
1060	*
1061	* Dump an HTML document. Formating return/spaces are added.
1062	*/
1063	void
1064	htmlDocContentDumpOutput(xmlOutputBufferPtr buf, xmlDocPtr cur,
1065	const char *encoding) {
1066	htmlDocContentDumpFormatOutput(buf, cur, encoding, 1);
1067	}
1068
1069	/************************************************************************
1070	* *
1071	* Saving functions front-ends *
1072	* *
1073	************************************************************************/
1074
1075	/**
1076	* htmlDocDump:
1077	* @f: the FILE*
1078	* @cur: the document
1079	*
1080	* Dump an HTML document to an open FILE.
1081	*
1082	* returns: the number of byte written or -1 in case of failure.
1083	*/
1084	int
1085	htmlDocDump(FILE *f, xmlDocPtr cur) {
1086	xmlOutputBufferPtr buf;
1087	xmlCharEncodingHandlerPtr handler = NULL;
1088	const char *encoding;
1089	int ret;
1090
1091	xmlInitParser();
1092
1093	if ((cur == NULL) \|\| (f == NULL)) {
1094	return(-1);
1095	}
1096
1097	encoding = (const char *) htmlGetMetaEncoding(cur);
1098
1099	if (encoding != NULL) {
1100	xmlCharEncoding enc;
1101
1102	enc = xmlParseCharEncoding(encoding);
1103	if (enc != cur->charset) {
1104	if (cur->charset != XML_CHAR_ENCODING_UTF8) {
1105	/*
1106	* Not supported yet
1107	*/
1108	return(-1);
1109	}
1110
1111	handler = xmlFindCharEncodingHandler(encoding);
1112	if (handler == NULL)
1113	htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
1114	} else {
1115	handler = xmlFindCharEncodingHandler(encoding);
1116	}
1117	}
1118
1119	/*
1120	* Fallback to HTML or ASCII when the encoding is unspecified
1121	*/
1122	if (handler == NULL)
1123	handler = xmlFindCharEncodingHandler("HTML");
1124	if (handler == NULL)
1125	handler = xmlFindCharEncodingHandler("ascii");
1126
1127	buf = xmlOutputBufferCreateFile(f, handler);
1128	if (buf == NULL) return(-1);
1129	htmlDocContentDumpOutput(buf, cur, NULL);
1130
1131	ret = xmlOutputBufferClose(buf);
1132	return(ret);
1133	}
1134
1135	/**
1136	* htmlSaveFile:
1137	* @filename: the filename (or URL)
1138	* @cur: the document
1139	*
1140	* Dump an HTML document to a file. If @filename is "-" the stdout file is
1141	* used.
1142	* returns: the number of byte written or -1 in case of failure.
1143	*/
1144	int
1145	htmlSaveFile(const char *filename, xmlDocPtr cur) {
1146	xmlOutputBufferPtr buf;
1147	xmlCharEncodingHandlerPtr handler = NULL;
1148	const char *encoding;
1149	int ret;
1150
1151	if ((cur == NULL) \|\| (filename == NULL))
1152	return(-1);
1153
1154	xmlInitParser();
1155
1156	encoding = (const char *) htmlGetMetaEncoding(cur);
1157
1158	if (encoding != NULL) {
1159	xmlCharEncoding enc;
1160
1161	enc = xmlParseCharEncoding(encoding);
1162	if (enc != cur->charset) {
1163	if (cur->charset != XML_CHAR_ENCODING_UTF8) {
1164	/*
1165	* Not supported yet
1166	*/
1167	return(-1);
1168	}
1169
1170	handler = xmlFindCharEncodingHandler(encoding);
1171	if (handler == NULL)
1172	htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
1173	}
1174	}
1175
1176	/*
1177	* Fallback to HTML or ASCII when the encoding is unspecified
1178	*/
1179	if (handler == NULL)
1180	handler = xmlFindCharEncodingHandler("HTML");
1181	if (handler == NULL)
1182	handler = xmlFindCharEncodingHandler("ascii");
1183
1184	/*
1185	* save the content to a temp buffer.
1186	*/
1187	buf = xmlOutputBufferCreateFilename(filename, handler, cur->compression);
1188	if (buf == NULL) return(0);
1189
1190	htmlDocContentDumpOutput(buf, cur, NULL);
1191
1192	ret = xmlOutputBufferClose(buf);
1193	return(ret);
1194	}
1195
1196	/**
1197	* htmlSaveFileFormat:
1198	* @filename: the filename
1199	* @cur: the document
1200	* @format: should formatting spaces been added
1201	* @encoding: the document encoding
1202	*
1203	* Dump an HTML document to a file using a given encoding.
1204	*
1205	* returns: the number of byte written or -1 in case of failure.
1206	*/
1207	int
1208	htmlSaveFileFormat(const char *filename, xmlDocPtr cur,
1209	const char *encoding, int format) {
1210	xmlOutputBufferPtr buf;
1211	xmlCharEncodingHandlerPtr handler = NULL;
1212	int ret;
1213
1214	if ((cur == NULL) \|\| (filename == NULL))
1215	return(-1);
1216
1217	xmlInitParser();
1218
1219	if (encoding != NULL) {
1220	xmlCharEncoding enc;
1221
1222	enc = xmlParseCharEncoding(encoding);
1223	if (enc != cur->charset) {
1224	if (cur->charset != XML_CHAR_ENCODING_UTF8) {
1225	/*
1226	* Not supported yet
1227	*/
1228	return(-1);
1229	}
1230
1231	handler = xmlFindCharEncodingHandler(encoding);
1232	if (handler == NULL)
1233	htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
1234	}
1235	htmlSetMetaEncoding(cur, (const xmlChar *) encoding);
1236	} else {
1237	htmlSetMetaEncoding(cur, (const xmlChar *) "UTF-8");
1238	}
1239
1240	/*
1241	* Fallback to HTML or ASCII when the encoding is unspecified
1242	*/
1243	if (handler == NULL)
1244	handler = xmlFindCharEncodingHandler("HTML");
1245	if (handler == NULL)
1246	handler = xmlFindCharEncodingHandler("ascii");
1247
1248	/*
1249	* save the content to a temp buffer.
1250	*/
1251	buf = xmlOutputBufferCreateFilename(filename, handler, 0);
1252	if (buf == NULL) return(0);
1253
1254	htmlDocContentDumpFormatOutput(buf, cur, encoding, format);
1255
1256	ret = xmlOutputBufferClose(buf);
1257	return(ret);
1258	}
1259
1260	/**
1261	* htmlSaveFileEnc:
1262	* @filename: the filename
1263	* @cur: the document
1264	* @encoding: the document encoding
1265	*
1266	* Dump an HTML document to a file using a given encoding
1267	* and formatting returns/spaces are added.
1268	*
1269	* returns: the number of byte written or -1 in case of failure.
1270	*/
1271	int
1272	htmlSaveFileEnc(const char filename, xmlDocPtr cur, const char encoding) {
1273	return(htmlSaveFileFormat(filename, cur, encoding, 1));
1274	}
1275
1276	#endif /* LIBXML_OUTPUT_ENABLED */
1277
1278	#define bottom_HTMLtree
1279	#include "elfgcchack.h"
1280	#endif /* LIBXML_HTML_ENABLED */

注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

source: vbox/trunk/src/libs/libxml2-2.9.2/HTMLtree.c@ 61378

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