Function xmlXPathGetElementsByIds

ThirdParty/libxml2/vtklibxml2/xpath.c:7495–7547

* xmlXPathGetElementsByIds: * @doc: the document * @ids: a whitespace separated list of IDs * * Selects elements by their unique ID. * * Returns a node-set of selected elements. */

 * Returns a node-set of selected elements.
 */
static xmlNodeSetPtr
xmlXPathGetElementsByIds (xmlDocPtr doc, const xmlChar *ids) {
    xmlNodeSetPtr ret;
    const xmlChar *cur = ids;
    xmlChar *ID;
    xmlAttrPtr attr;
    xmlNodePtr elem = NULL;

    if (ids == NULL) return(NULL);

    ret = xmlXPathNodeSetCreate(NULL);
    if (ret == NULL)
        return(ret);

    while (IS_BLANK_CH(*cur)) cur++;
    while (*cur != 0) {
	while ((!IS_BLANK_CH(*cur)) && (*cur != 0))
	    cur++;

        ID = xmlStrndup(ids, cur - ids);
	if (ID == NULL) {
            xmlXPathFreeNodeSet(ret);
            return(NULL);
        }
        /*
         * We used to check the fact that the value passed
         * was an NCName, but this generated much troubles for
         * me and Aleksey Sanin, people blatantly violated that
         * constraint, like Visa3D spec.
         * if (xmlValidateNCName(ID, 1) == 0)
         */
        attr = xmlGetID(doc, ID);
        xmlFree(ID);
        if (attr != NULL) {
            if (attr->type == XML_ATTRIBUTE_NODE)
                elem = attr->parent;
            else if (attr->type == XML_ELEMENT_NODE)
                elem = (xmlNodePtr) attr;
            else
                elem = NULL;
            if (elem != NULL) {
                if (xmlXPathNodeSetAdd(ret, elem) < 0) {
                    xmlXPathFreeNodeSet(ret);
                    return(NULL);
                }
            }
        }

	while (IS_BLANK_CH(*cur)) cur++;
	ids = cur;
    }
    return(ret);
}

/**
 * xmlXPathIdFunction: