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  1. /*  
  2.  
  3. xpath2 ini/config.xml '//anode'
  4.  
  5.  * section:     XPath
  6.  * synopsis:    Load a document, locate subelements with XPath,
  7.  * usage:       xpath2 <xml-file> <xpath-expr>
  8.  * test:        xpath2 test3.xml '//discarded'
  9.  */
  10. #include <stdlib.h>
  11. #include <stdio.h>
  12. #include <string.h>
  13. #include <assert.h>
  14. #include <vector>
  15.  
  16. #include <libxml/tree.h>
  17. #include <libxml/parser.h>
  18. #include <libxml/xpath.h>
  19. #include <libxml/xpathInternals.h>
  20.  
  21. #if defined(LIBXML_XPATH_ENABLED) && defined(LIBXML_SAX1_ENABLED) && \
  22.     defined(LIBXML_OUTPUT_ENABLED)
  23.  
  24.  
  25.  
  26. static int  getvalue(xmlXPathContextPtr xpathCtx, const xmlChar * xpathExpr, std::vector <xmlChar *> &retval);
  27. static xmlChar * getvalue(xmlXPathContextPtr xpathCtx, const xmlChar * xpathExpr, int which=0);
  28.  
  29.  
  30. int
  31. main(int argc, char **argv) {
  32.     std::vector<xmlChar *> retval;
  33.     xmlDocPtr doc;
  34.     xmlXPathContextPtr xpathCtx;
  35.     int size;
  36.    
  37.     xmlInitParser();
  38.     LIBXML_TEST_VERSION
  39.    
  40.      /* Load XML document */
  41.     doc = xmlParseFile(argv[1]);
  42.     if (doc == NULL) {
  43.         fprintf(stderr, "Error: unable to parse file \"%s\"\n", argv[1]);
  44.         return(-1);
  45.     }
  46.  
  47.     /* Create xpath evaluation context */
  48.     xpathCtx = xmlXPathNewContext(doc);
  49.     if(xpathCtx == NULL) {
  50.         fprintf(stderr,"Error: unable to create new XPath context\n");
  51.         xmlFreeDoc(doc);
  52.         return(-1);
  53.     }
  54.    
  55.     for (int i=2; i<argc;i++){    
  56.       size = getvalue(xpathCtx, BAD_CAST argv[i] , retval);
  57.       printf ("-->size = %d value %s\n",size, getvalue(xpathCtx, BAD_CAST argv[i])   );
  58.     }
  59.      
  60.     xmlXPathFreeContext(xpathCtx);
  61.     xmlFreeDoc(doc);    
  62.     xmlCleanupParser();
  63.     xmlMemoryDump();
  64.     return 0;
  65. }
  66.  
  67.  
  68. /**
  69.  * getvalue:
  70.  * @xpathCtx:           the input xmlXPathContextPtr
  71.  * @xpathExpr:          the xpath expression for evaluation.
  72.  *
  73.  * evaluates XPath expression
  74.  *
  75.  * Returns node content
  76.  */
  77. int getvalue(xmlXPathContextPtr xpathCtx, const xmlChar* xpathExpr, std::vector<xmlChar *> &retval) {
  78.    
  79.     xmlXPathObjectPtr xpathObj;
  80.     xmlNodeSetPtr nodes;
  81.     xmlChar * ret=NULL;
  82.     int size;
  83.     int i;
  84.     assert(xpathExpr);
  85.     /* Evaluate xpath expression */
  86.     xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
  87.     if(xpathObj == NULL) {
  88.         fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr);
  89.         return retval.size();
  90.     }
  91.    
  92.     nodes  = xpathObj->nodesetval;
  93.     size   = (nodes) ? nodes->nodeNr : 0;
  94.     for(i = 0; i< size; i++) {
  95.       ret = xmlNodeGetContent(nodes->nodeTab[i]);
  96.       if(ret) {
  97.         retval.push_back(ret);
  98.         printf("[%d] %s         Return value: %s\n", i, xpathExpr, ret);
  99.       }  
  100.     }
  101.    
  102.     /* Cleanup of XPath data */
  103.     xmlXPathFreeObject(xpathObj);
  104.    
  105.     return retval.size();
  106. }
  107.  
  108. xmlChar *  getvalue(xmlXPathContextPtr xpathCtx, const xmlChar* xpathExpr, int which) {
  109.    
  110.     xmlXPathObjectPtr xpathObj;
  111.     xmlNodeSetPtr nodes;
  112.     xmlChar * ret=NULL;
  113.     int size;
  114.     int i;
  115.     assert(xpathExpr);
  116.     /* Evaluate xpath expression */
  117.     xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
  118.     if(xpathObj == NULL) {
  119.         fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr);
  120.         return NULL;
  121.     }
  122.    
  123.     nodes  = xpathObj->nodesetval;
  124.     size   = (nodes) ? nodes->nodeNr : 0;
  125.     for(i = 0; i< size; i++) {
  126.       ret = xmlNodeGetContent(nodes->nodeTab[i]);
  127.       if(ret) {  
  128.         printf("%s         Return value: %s\n",  xpathExpr, ret);
  129.         return ret;
  130.       }  
  131.     }
  132.    
  133.     /* Cleanup of XPath data */
  134.     xmlXPathFreeObject(xpathObj);
  135.    
  136.     return NULL;
  137. }
  138.  
  139. #endif
  140.