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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | f9daq | 1 | /* |
| 2 | |||
| 3 | xpath2 ini/config.xml '//anode' |
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| 4 | |||
| 5 | * section: XPath |
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| 6 | * synopsis: Load a document, locate subelements with XPath, |
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| 7 | * usage: xpath2 <xml-file> <xpath-expr> |
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| 8 | * test: xpath2 test3.xml '//discarded' |
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| 9 | */ |
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| 10 | #include <stdlib.h> |
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| 11 | #include <stdio.h> |
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| 12 | #include <string.h> |
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| 13 | #include <assert.h> |
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| 14 | #include <vector> |
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| 15 | |||
| 16 | #include <libxml/tree.h> |
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| 17 | #include <libxml/parser.h> |
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| 18 | #include <libxml/xpath.h> |
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| 19 | #include <libxml/xpathInternals.h> |
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| 20 | |||
| 21 | #if defined(LIBXML_XPATH_ENABLED) && defined(LIBXML_SAX1_ENABLED) && \ |
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| 22 | defined(LIBXML_OUTPUT_ENABLED) |
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| 23 | |||
| 24 | |||
| 25 | |||
| 26 | static int getvalue(xmlXPathContextPtr xpathCtx, const xmlChar * xpathExpr, std::vector <xmlChar *> &retval); |
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| 27 | static xmlChar * getvalue(xmlXPathContextPtr xpathCtx, const xmlChar * xpathExpr, int which=0); |
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| 28 | |||
| 29 | |||
| 30 | int |
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| 31 | main(int argc, char **argv) { |
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| 32 | std::vector<xmlChar *> retval; |
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| 33 | xmlDocPtr doc; |
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| 34 | xmlXPathContextPtr xpathCtx; |
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| 35 | int size; |
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| 36 | |||
| 37 | xmlInitParser(); |
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| 38 | LIBXML_TEST_VERSION |
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| 39 | |||
| 40 | /* Load XML document */ |
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| 41 | doc = xmlParseFile(argv[1]); |
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| 42 | if (doc == NULL) { |
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| 43 | fprintf(stderr, "Error: unable to parse file \"%s\"\n", argv[1]); |
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| 44 | return(-1); |
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| 45 | } |
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| 46 | |||
| 47 | /* Create xpath evaluation context */ |
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| 48 | xpathCtx = xmlXPathNewContext(doc); |
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| 49 | if(xpathCtx == NULL) { |
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| 50 | fprintf(stderr,"Error: unable to create new XPath context\n"); |
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| 51 | xmlFreeDoc(doc); |
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| 52 | return(-1); |
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| 53 | } |
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| 54 | |||
| 55 | for (int i=2; i<argc;i++){ |
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| 56 | size = getvalue(xpathCtx, BAD_CAST argv[i] , retval); |
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| 57 | printf ("-->size = %d value %s\n",size, getvalue(xpathCtx, BAD_CAST argv[i]) ); |
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| 58 | } |
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| 59 | |||
| 60 | xmlXPathFreeContext(xpathCtx); |
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| 61 | xmlFreeDoc(doc); |
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| 62 | xmlCleanupParser(); |
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| 63 | xmlMemoryDump(); |
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| 64 | return 0; |
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| 65 | } |
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| 66 | |||
| 67 | |||
| 68 | /** |
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| 69 | * getvalue: |
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| 70 | * @xpathCtx: the input xmlXPathContextPtr |
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| 71 | * @xpathExpr: the xpath expression for evaluation. |
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| 72 | * |
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| 73 | * evaluates XPath expression |
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| 74 | * |
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| 75 | * Returns node content |
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| 76 | */ |
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| 77 | int getvalue(xmlXPathContextPtr xpathCtx, const xmlChar* xpathExpr, std::vector<xmlChar *> &retval) { |
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| 78 | |||
| 79 | xmlXPathObjectPtr xpathObj; |
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| 80 | xmlNodeSetPtr nodes; |
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| 81 | xmlChar * ret=NULL; |
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| 82 | int size; |
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| 83 | int i; |
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| 84 | assert(xpathExpr); |
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| 85 | /* Evaluate xpath expression */ |
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| 86 | xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx); |
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| 87 | if(xpathObj == NULL) { |
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| 88 | fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr); |
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| 89 | return retval.size(); |
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| 90 | } |
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| 91 | |||
| 92 | nodes = xpathObj->nodesetval; |
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| 93 | size = (nodes) ? nodes->nodeNr : 0; |
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| 94 | for(i = 0; i< size; i++) { |
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| 95 | ret = xmlNodeGetContent(nodes->nodeTab[i]); |
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| 96 | if(ret) { |
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| 97 | retval.push_back(ret); |
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| 98 | printf("[%d] %s Return value: %s\n", i, xpathExpr, ret); |
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| 99 | } |
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| 100 | } |
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| 101 | |||
| 102 | /* Cleanup of XPath data */ |
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| 103 | xmlXPathFreeObject(xpathObj); |
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| 104 | |||
| 105 | return retval.size(); |
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| 106 | } |
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| 107 | |||
| 108 | xmlChar * getvalue(xmlXPathContextPtr xpathCtx, const xmlChar* xpathExpr, int which) { |
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| 109 | |||
| 110 | xmlXPathObjectPtr xpathObj; |
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| 111 | xmlNodeSetPtr nodes; |
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| 112 | xmlChar * ret=NULL; |
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| 113 | int size; |
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| 114 | int i; |
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| 115 | assert(xpathExpr); |
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| 116 | /* Evaluate xpath expression */ |
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| 117 | xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx); |
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| 118 | if(xpathObj == NULL) { |
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| 119 | fprintf(stderr,"Error: unable to evaluate xpath expression \"%s\"\n", xpathExpr); |
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| 120 | return NULL; |
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| 121 | } |
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| 122 | |||
| 123 | nodes = xpathObj->nodesetval; |
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| 124 | size = (nodes) ? nodes->nodeNr : 0; |
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| 125 | for(i = 0; i< size; i++) { |
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| 126 | ret = xmlNodeGetContent(nodes->nodeTab[i]); |
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| 127 | if(ret) { |
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| 128 | printf("%s Return value: %s\n", xpathExpr, ret); |
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| 129 | return ret; |
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| 130 | } |
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| 131 | } |
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| 132 | |||
| 133 | /* Cleanup of XPath data */ |
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| 134 | xmlXPathFreeObject(xpathObj); |
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| 135 | |||
| 136 | return NULL; |
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| 137 | } |
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| 138 | |||
| 139 | #endif |