91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
//
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// Author: Wolfgang Spraul
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//
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// This is free and unencumbered software released into the public domain.
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// For details see the UNLICENSE file at the root of the source tree.
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//
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <libxml/tree.h>
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#include <libxml/parser.h>
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#include <libxml/xpath.h>
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#include <libxml/xpathInternals.h>
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static const xmlChar* empty_svg = (const xmlChar*)
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
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"<svg\n"
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" xmlns=\"http://www.w3.org/2000/svg\"\n"
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" version=\"2.0\"\n"
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" xmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
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" viewBox=\"0 0 1000 1000\" width=\"1000\" height=\"1000\">\n"
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" <rect width=\"100%\" height=\"100%\" style=\"fill:black;\"/>\n"
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" <g id=\"root\" transform=\"translate(0,1000) scale(1,-1)\">\n"
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" </g>\n"
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"</svg>\n";
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int main(int argc, char** argv)
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{
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xmlDocPtr doc = 0;
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xmlXPathContextPtr xpathCtx = 0;
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xmlXPathObjectPtr xpathObj = 0;
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xmlInitParser();
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doc = xmlParseDoc(empty_svg);
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if (!doc) {
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fprintf(stderr, "Internal error %i.\n", __LINE__);
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goto fail_xml;
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}
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xpathCtx = xmlXPathNewContext(doc);
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if (!xpathCtx) {
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fprintf(stderr, "Cannot create XPath context.\n");
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goto fail_xml;
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}
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xmlXPathRegisterNs(xpathCtx, BAD_CAST "svg", BAD_CAST "http://www.w3.org/2000/svg");
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xpathObj = xmlXPathEvalExpression(BAD_CAST "//svg:*[@id='root']", xpathCtx);
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if (!xpathObj) {
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fprintf(stderr, "Cannot evaluate root expression.\n");
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goto fail_xml;
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}
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if (!xpathObj->nodesetval) {
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fprintf(stderr, "Cannot find root node.\n");
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goto fail_xml;
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}
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if (xpathObj->nodesetval->nodeNr != 1) {
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fprintf(stderr, "Found %i root nodes.\n", xpathObj->nodesetval->nodeNr);
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goto fail_xml;
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}
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{
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xmlNodePtr new_node;
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int i;
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for (i = 0; i < 10; i++) {
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new_node = xmlNewChild(xpathObj->nodesetval->nodeTab[0], 0 /* xmlNsPtr */, BAD_CAST "use", 0 /* content */);
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xmlSetProp(new_node, BAD_CAST "xlink:href", BAD_CAST "lib.svg#IOB");
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xmlSetProp(new_node, BAD_CAST "x", xmlXPathCastNumberToString(50+i*50));
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xmlSetProp(new_node, BAD_CAST "y", BAD_CAST "50");
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xmlSetProp(new_node, BAD_CAST "width", BAD_CAST "50");
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xmlSetProp(new_node, BAD_CAST "height", BAD_CAST "50");
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}
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}
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xmlDocDump(stdout, doc);
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xmlXPathFreeObject(xpathObj);
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xmlXPathFreeContext(xpathCtx);
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xmlFreeDoc(doc);
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xmlCleanupParser();
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return EXIT_SUCCESS;
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fail_xml:
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if (xpathObj) xmlXPathFreeObject(xpathObj);
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if (xpathCtx) xmlXPathFreeContext(xpathCtx);
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if (doc) xmlFreeDoc(doc);
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xmlCleanupParser();
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return EXIT_FAILURE;
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}
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