Function xmlXPathRunEval

ThirdParty/libxml2/vtklibxml2/xpath.c:12693–12760

* xmlXPathRunEval: * @ctxt: the XPath parser context with the compiled expression * @toBool: evaluate to a boolean result * * Evaluate the Precompiled XPath expression in the given context. */

 * Evaluate the Precompiled XPath expression in the given context.
 */
static int
xmlXPathRunEval(xmlXPathParserContextPtr ctxt, int toBool)
{
    xmlXPathCompExprPtr comp;
    int oldDepth;

    if ((ctxt == NULL) || (ctxt->comp == NULL))
	return(-1);

    if (ctxt->valueTab == NULL) {
	/* Allocate the value stack */
	ctxt->valueTab = (xmlXPathObjectPtr *)
			 xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
	if (ctxt->valueTab == NULL) {
	    xmlXPathPErrMemory(ctxt);
	    return(-1);
	}
	ctxt->valueNr = 0;
	ctxt->valueMax = 10;
	ctxt->value = NULL;
    }
#ifdef XPATH_STREAMING
    if (ctxt->comp->stream) {
	int res;

	if (toBool) {
	    /*
	    * Evaluation to boolean result.
	    */
	    res = xmlXPathRunStreamEval(ctxt, ctxt->comp->stream, NULL, 1);
	    if (res != -1)
		return(res);
	} else {
	    xmlXPathObjectPtr resObj = NULL;

	    /*
	    * Evaluation to a sequence.
	    */
	    res = xmlXPathRunStreamEval(ctxt, ctxt->comp->stream, &resObj, 0);

	    if ((res != -1) && (resObj != NULL)) {
		valuePush(ctxt, resObj);
		return(0);
	    }
	    if (resObj != NULL)
		xmlXPathReleaseObject(ctxt->context, resObj);
	}
	/*
	* QUESTION TODO: This falls back to normal XPath evaluation
	* if res == -1. Is this intended?
	*/
    }
#endif
    comp = ctxt->comp;
    if (comp->last < 0) {
        xmlXPathErr(ctxt, XPATH_STACK_ERROR);
	return(-1);
    }