+struct select_info {
+ NMEM nmem;
+ char *xpath_expr;
+};
+
+static void *construct_select(const xmlNode *ptr,
+ const char *path, WRBUF wr_error)
+{
+ if (strcmp((const char *) ptr->name, "select"))
+ return 0;
+ else
+ {
+ NMEM nmem = nmem_create();
+ struct select_info *info = nmem_malloc(nmem, sizeof(*info));
+ const char *attr_str;
+ const char *xpath = 0;
+
+ info->nmem = nmem;
+ info->xpath_expr = 0;
+ attr_str = yaz_xml_get_prop(ptr, "path%s", &xpath);
+ if (attr_str)
+ {
+ wrbuf_printf(wr_error, "Bad attribute '%s'"
+ "Expected xpath.", attr_str);
+ nmem_destroy(nmem);
+ return 0;
+ }
+ if (xpath)
+ info->xpath_expr = nmem_strdup(nmem, xpath);
+ return info;
+ }
+}
+
+static int convert_select(void *vinfo, WRBUF record, WRBUF wr_error)
+{
+ int ret = 0;
+ struct select_info *info = vinfo;
+
+ xmlDocPtr doc = xmlParseMemory(wrbuf_buf(record),
+ wrbuf_len(record));
+ if (!doc)
+ {
+ wrbuf_printf(wr_error, "xmlParseMemory failed");
+ ret = -1;
+ }
+ else
+ {
+ xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
+ if (xpathCtx && info->xpath_expr)
+ {
+ xmlXPathObjectPtr xpathObj =
+ xmlXPathEvalExpression((const xmlChar *) info->xpath_expr,
+ xpathCtx);
+ if (xpathObj)
+ {
+ xmlNodeSetPtr nodes = xpathObj->nodesetval;
+ if (nodes)
+ {
+ int i;
+ if (nodes->nodeNr > 0)
+ wrbuf_rewind(record);
+ for (i = 0; i < nodes->nodeNr; i++)
+ {
+ xmlNode *ptr = nodes->nodeTab[i];
+ if (ptr->type == XML_ELEMENT_NODE)
+ ptr = ptr->children;
+ for (; ptr; ptr = ptr->next)
+ if (ptr->type == XML_TEXT_NODE)
+ wrbuf_puts(record, (const char *) ptr->content);
+ }
+ }
+ xmlXPathFreeObject(xpathObj);
+ }
+ xmlXPathFreeContext(xpathCtx);
+ }
+ xmlFreeDoc(doc);
+ }
+ return ret;
+}
+
+static void destroy_select(void *vinfo)
+{
+ struct select_info *info = vinfo;
+
+ if (info)
+ nmem_destroy(info->nmem);
+}
+
+