Function xmlXPathEval

ThirdParty/libxml2/vtklibxml2/xpath.c:13287–13315

* xmlXPathEval: * @str: the XPath expression * @ctx: the XPath context * * Evaluate the XPath Location Path in the given context. * * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL. * the caller has to free the object. */

 *         the caller has to free the object.
 */
xmlXPathObjectPtr
xmlXPathEval(const xmlChar *str, xmlXPathContextPtr ctx) {
    xmlXPathParserContextPtr ctxt;
    xmlXPathObjectPtr res;

    if (ctx == NULL)
        return(NULL);

    xmlInitParser();

    xmlResetError(&ctx->lastError);

    ctxt = xmlXPathNewParserContext(str, ctx);
    if (ctxt == NULL)
        return NULL;
    xmlXPathEvalExpr(ctxt);

    if (ctxt->error != XPATH_EXPRESSION_OK) {
	res = NULL;
    } else if (ctxt->valueNr != 1) {
        xmlXPathErr(ctxt, XPATH_STACK_ERROR);
	res = NULL;
    } else {
	res = valuePop(ctxt);
    }

    xmlXPathFreeParserContext(ctxt);
    return(res);
}

/**
 * xmlXPathSetContextNode: