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1e90661bb8
* globals.c xmlwriter.c doc/apibuild.py include/libxml/globals.h include/libxml/pattern.h include/libxml/schemasInternals.h include/libxml/xmlexports.h include/libxml/xmlwriter.h: cleanup the make rebuild in doc, this include new directive to stop documentation warnings * doc/* doc/html/*: rebuilt the docs * pattern.c xmlreader.c include/libxml/pattern.h include/libxml/xmlreader.h: adding xmlTextReaderPreservePattern() to save nodes while scanning the tree with the reader, cleanup the way element were freed, and xmlTextReaderPreserve() implementation, the API might change for namespace binding support when compiling patterns. * doc/examples/*: added reader3.c exposing the xmlTextReaderPreserve() Daniel
105 lines
2.5 KiB
C
105 lines
2.5 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.out ; 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) < 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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return(0);
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}
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