void xpath::init_raw_(const std::string& str)
{
// Compile the XPath expression.
xmlXPathCompExpr* px = xmlXPathCompile(detail::to_xml_chars(str.c_str()));
if (px == 0)
{
std::string what = "fail to compile XPath expression: " + str;
throw xpath_error(what);
}
// Free the underlying XPath expression object as necessary.
if (raw_ != 0)
{
xmlXPathFreeCompExpr(raw_);
raw_ = 0;
}
// Reset raw.
raw_ = px;
}
int
main(int argc, char **argv) {
#else
int
xpath_locator(int argc, char **argv) {
#endif
if (argc < 2) {
fprintf(stderr, "Need to specify an input filename.\n"
"Usage: xpath_locator file.xml xpath1 xpath2 ...\n");
exit(1);
}
char *xml_filename = argv[1];
num_xpaths = argc - 2;
xpath_finders = (XPathFinder *) mmalloc(num_xpaths * sizeof(XPathFinder));
for (int xpath_num = 0; xpath_num < num_xpaths; ++xpath_num) {
xmlChar *xpath_expr = (xmlChar *) argv[xpath_num + 2];
XPathFinder *xpath_finder = &xpath_finders[xpath_num];
xpath_finder->original = new_string(xpath_expr);
xpath_finder->current_level = 0;
xpath_finder->line_number = 0;
xpath_finder->column_number = 0;
escape_uri_slashes(xpath_expr, TRUE);
int num_segs = xpath_finder->num_segs = count_chars(xpath_expr, '/');
XPathSegFinder *seg_finders =
(XPathSegFinder *) mmalloc(num_segs * sizeof(XPathSegFinder));
xpath_finder->seg_finders = seg_finders;
/* Extract each XPath segment */
xmlChar *seg = xstrtok(xpath_expr, "/");
int seg_num = 0;
while (seg != NULL) {
XPathSegFinder *seg_finder = &seg_finders[seg_num];
seg_finder->count = 0;
escape_uri_slashes(seg, FALSE);
seg_finder->original = new_string(seg);
// Get the element local name
xmlChar *lns = starts_with(seg, (const xmlChar *) "*:") ? seg + 2 : seg;
const xmlChar *bracket = xstrchr(seg, '[');
if (!bracket)
xpath_error(xpath_num, xpath_finder, seg_num, "No bracket found");
int local_name_len = bracket - lns;
xmlChar *local_name = seg_finder->local_name =
new_string_n(lns, local_name_len);
if (starts_with(bracket + 1, (const xmlChar *) "namespace-uri()=")) {
const xmlChar *ns_start = bracket + 18;
const xmlChar *ns_end = xstrchr(ns_start, '\'');
if (!ns_end)
xpath_error(xpath_num, xpath_finder, seg_num,
"No end to the namespace URI");
seg_finder->namespace_uri = new_string_n(ns_start, ns_end - ns_start);
bracket = xstrchr(ns_end, '[');
if (!bracket)
xpath_error(xpath_num, xpath_finder, seg_num, "No position found");
}
else {
seg_finder->namespace_uri = NULL;
}
const xmlChar *pos_start = bracket + 1;
const xmlChar *pos_end = xstrchr(pos_start, ']');
if (!pos_end)
xpath_error(xpath_num, xpath_finder, seg_num, "No closing bracket found");
size_t pos_str_len = pos_end - pos_start;
char pos_str[10];
strncpy(pos_str, (const char *) pos_start, pos_str_len);
pos_str[pos_str_len] = 0;
seg_finder->position = strtol(pos_str, NULL, 10);
if (seg_finder->position <= 0)
xpath_error(xpath_num, xpath_finder, seg_num, "Bad position argument");
seg = xstrtok(NULL, "/");
seg_num++;
}
}
// Initialize default handler structure for SAX 2
xmlSAXVersion(handlers, 2);
handlers->startElementNs = my_startElementNs;
handlers->endElementNs = my_endElementNs;
parser_level = 0; // [c] parser_level is safe
int res = xmlSAXUserParseFile(handlers, NULL, xml_filename);
// Output the results
for (int xpath_num = 0; xpath_num < num_xpaths; ++xpath_num) {
XPathFinder *xpath_finder = &xpath_finders[xpath_num];
printf("%d:%d\n", xpath_finder->line_number, xpath_finder->column_number);
}
for (int xpath_num = 0; xpath_num < num_xpaths; ++xpath_num) {
XPathFinder *xpath_finder = &xpath_finders[xpath_num];
int num_segs = xpath_finder->num_segs;
XPathSegFinder *seg_finders = xpath_finder->seg_finders;
for (int seg_num = 0; seg_num < num_segs; ++seg_num) {
XPathSegFinder *seg_finder = &seg_finders[seg_num];
ffree(seg_finder->original);
ffree(seg_finder->local_name);
ffree(seg_finder->namespace_uri);
}
ffree(xpath_finder->seg_finders);
ffree(xpath_finder->original);
}
ffree(xpath_finders);
return 0;
}
