Function xmlReversePattern

ThirdParty/libxml2/vtklibxml2/pattern.c:407–455

* xmlReversePattern: * @comp: the compiled match expression * * reverse all the stack of expressions * * returns 0 in case of success and -1 in case of error. */

 * returns 0 in case of success and -1 in case of error.
 */
static int
xmlReversePattern(xmlPatternPtr comp) {
    int i, j;

    /*
     * remove the leading // for //a or .//a
     */
    if ((comp->nbStep > 0) && (comp->steps[0].op == XML_OP_ANCESTOR)) {
        for (i = 0, j = 1;j < comp->nbStep;i++,j++) {
	    comp->steps[i].value = comp->steps[j].value;
	    comp->steps[i].value2 = comp->steps[j].value2;
	    comp->steps[i].op = comp->steps[j].op;
	}
	comp->nbStep--;
    }
    if (comp->nbStep >= comp->maxStep) {
        xmlStepOpPtr temp;
	temp = (xmlStepOpPtr) xmlRealloc(comp->steps, comp->maxStep * 2 *
	                                 sizeof(xmlStepOp));
        if (temp == NULL) {
	    ERROR(ctxt, NULL, NULL,
			     "xmlReversePattern: realloc failed\n");
	    return (-1);
	}
	comp->steps = temp;
	comp->maxStep *= 2;
    }
    i = 0;
    j = comp->nbStep - 1;
    while (j > i) {
	register const xmlChar *tmp;
	register xmlPatOp op;
	tmp = comp->steps[i].value;
	comp->steps[i].value = comp->steps[j].value;
	comp->steps[j].value = tmp;
	tmp = comp->steps[i].value2;
	comp->steps[i].value2 = comp->steps[j].value2;
	comp->steps[j].value2 = tmp;
	op = comp->steps[i].op;
	comp->steps[i].op = comp->steps[j].op;
	comp->steps[j].op = op;
	j--;
	i++;
    }
    comp->steps[comp->nbStep].value = NULL;
    comp->steps[comp->nbStep].value2 = NULL;
    comp->steps[comp->nbStep++].op = XML_OP_END;
    return(0);
}

/************************************************************************
 *									*