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4773df2a58
* doc/examples/*: added io1.c an example ox xmlIO usage and io1.res test result, fixed a awful lot of memory leaks showing up in testWriter.c, changed the examples and the Makefiles to test memory leaks. * xmlwriter.c: fixed a memory leak * Makefile.am: run the doc/examples regression tests as part of make tests * xpath.c include/libxml/xpath.h: added xmlXPathCtxtCompile() to compile an XPath expression within a context, currently the goal is to be able to reuse the XSLT stylesheet dictionnary, but this opens the door to others possible optimizations. * dict.c include/libxml/dict.h: added xmlDictCreateSub() which allows to build a new dictionnary based on another read-only dictionnary. This is needed for XSLT to keep the stylesheet dictionnary read-only while being able to reuse the strings for the transformation dictionnary. * xinclude.c: fixed a dictionnar reference counting problem occuring when document parsing failed. * testSAX.c: adding option --repeat for timing 100times the parsing * doc/* : rebuilt all the docs Daniel
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/**
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* section: xmlReader
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* synopsis: Show how to extract subdocuments with xmlReader
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* purpose: Demonstrate the use of xmlTextReaderPreservePattern()
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* to parse an XML file with the xmlReader while collecting
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* only some subparts of the document
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* usage: reader3
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* test: reader3 > reader3.tmp ; diff reader3.tmp reader3.res ; rm reader3.tmp
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* author: Daniel Veillard
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* copy: see Copyright for the status of this software.
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*/
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#include <stdio.h>
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#include <libxml/xmlreader.h>
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/**
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* streamFile:
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* @filename: the file name to parse
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*
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* Parse and print information about an XML file.
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*
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* Returns the resulting doc with just the elements preserved.
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*/
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static xmlDocPtr
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extractFile(const char *filename, const xmlChar *pattern) {
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xmlDocPtr doc;
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xmlTextReaderPtr reader;
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int ret;
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/*
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* build an xmlReader for that file
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*/
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reader = xmlReaderForFile(filename, NULL, 0);
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if (reader != NULL) {
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/*
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* add the pattern to preserve
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*/
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if (xmlTextReaderPreservePattern(reader, pattern, NULL) < 0) {
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fprintf(stderr, "%s : failed add preserve pattern %s\n",
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filename, (const char *) pattern);
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}
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/*
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* Parse and traverse the tree, collecting the nodes in the process
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*/
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ret = xmlTextReaderRead(reader);
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while (ret == 1) {
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ret = xmlTextReaderRead(reader);
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}
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if (ret != 0) {
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fprintf(stderr, "%s : failed to parse\n", filename);
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xmlFreeTextReader(reader);
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return(NULL);
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}
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/*
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* get the resulting nodes
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*/
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doc = xmlTextReaderCurrentDoc(reader);
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/*
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* Free up the reader
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*/
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xmlFreeTextReader(reader);
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} else {
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fprintf(stderr, "Unable to open %s\n", filename);
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return(NULL);
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}
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return(doc);
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}
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int main(int argc, char **argv) {
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const char *filename = "test3.xml";
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const char *pattern = "preserved";
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xmlDocPtr doc;
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if (argc == 3) {
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filename = argv[1];
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pattern = argv[2];
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}
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/*
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* this initialize the library and check potential ABI mismatches
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* between the version it was compiled for and the actual shared
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* library used.
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*/
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LIBXML_TEST_VERSION
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doc = extractFile(filename, (const xmlChar *) pattern);
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if (doc != NULL) {
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/*
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* ouptut the result.
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*/
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xmlDocDump(stdout, doc);
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/*
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* don't forget to free up the doc
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*/
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xmlFreeDoc(doc);
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}
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/*
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* Cleanup function for the XML library.
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*/
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xmlCleanupParser();
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/*
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* this is to debug memory for regression tests
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*/
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xmlMemoryDump();
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return(0);
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}
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