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xml_xpath_context.c
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xml_xpath_context.c
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#include <xml_xpath_context.h>
static void deallocate(xmlXPathContextPtr ctx)
{
NOKOGIRI_DEBUG_START(ctx);
xmlXPathFreeContext(ctx);
NOKOGIRI_DEBUG_END(ctx);
}
/*
* call-seq:
* register_ns(prefix, uri)
*
* Register the namespace with +prefix+ and +uri+.
*/
static VALUE register_ns(VALUE self, VALUE prefix, VALUE uri)
{
xmlXPathContextPtr ctx;
Data_Get_Struct(self, xmlXPathContext, ctx);
xmlXPathRegisterNs( ctx,
(const xmlChar *)StringValueCStr(prefix),
(const xmlChar *)StringValueCStr(uri)
);
return self;
}
/*
* call-seq:
* register_variable(name, value)
*
* Register the variable +name+ with +value+.
*/
static VALUE register_variable(VALUE self, VALUE name, VALUE value)
{
xmlXPathContextPtr ctx;
xmlXPathObjectPtr xmlValue;
Data_Get_Struct(self, xmlXPathContext, ctx);
xmlValue = xmlXPathNewCString(StringValueCStr(value));
xmlXPathRegisterVariable( ctx,
(const xmlChar *)StringValueCStr(name),
xmlValue
);
return self;
}
void Nokogiri_marshal_xpath_funcall_and_return_values(xmlXPathParserContextPtr ctx, int nargs, VALUE handler, const char* function_name)
{
int i;
VALUE result, doc;
VALUE *argv;
VALUE node_set = Qnil;
xmlNodeSetPtr xml_node_set = NULL;
xmlXPathObjectPtr obj;
assert(ctx->context->doc);
assert(DOC_RUBY_OBJECT_TEST(ctx->context->doc));
argv = (VALUE *)calloc((size_t)nargs, sizeof(VALUE));
for (i = 0 ; i < nargs ; ++i) {
rb_gc_register_address(&argv[i]);
}
doc = DOC_RUBY_OBJECT(ctx->context->doc);
if (nargs > 0) {
i = nargs - 1;
do {
obj = valuePop(ctx);
switch(obj->type) {
case XPATH_STRING:
argv[i] = NOKOGIRI_STR_NEW2(obj->stringval);
break;
case XPATH_BOOLEAN:
argv[i] = obj->boolval == 1 ? Qtrue : Qfalse;
break;
case XPATH_NUMBER:
argv[i] = rb_float_new(obj->floatval);
break;
case XPATH_NODESET:
argv[i] = Nokogiri_wrap_xml_node_set(obj->nodesetval, doc);
break;
default:
argv[i] = NOKOGIRI_STR_NEW2(xmlXPathCastToString(obj));
}
xmlXPathFreeNodeSetList(obj);
} while(i-- > 0);
}
result = rb_funcall2(handler, rb_intern((const char*)function_name), nargs, argv);
for (i = 0 ; i < nargs ; ++i) {
rb_gc_unregister_address(&argv[i]);
}
free(argv);
switch(TYPE(result)) {
case T_FLOAT:
case T_BIGNUM:
case T_FIXNUM:
xmlXPathReturnNumber(ctx, NUM2DBL(result));
break;
case T_STRING:
xmlXPathReturnString(
ctx,
xmlCharStrdup(StringValueCStr(result))
);
break;
case T_TRUE:
xmlXPathReturnTrue(ctx);
break;
case T_FALSE:
xmlXPathReturnFalse(ctx);
break;
case T_NIL:
break;
case T_ARRAY:
{
VALUE args[2];
args[0] = doc;
args[1] = result;
node_set = rb_class_new_instance(2, args, cNokogiriXmlNodeSet);
Data_Get_Struct(node_set, xmlNodeSet, xml_node_set);
xmlXPathReturnNodeSet(ctx, xmlXPathNodeSetMerge(NULL, xml_node_set));
}
break;
case T_DATA:
if(rb_obj_is_kind_of(result, cNokogiriXmlNodeSet)) {
Data_Get_Struct(result, xmlNodeSet, xml_node_set);
/* Copy the node set, otherwise it will get GC'd. */
xmlXPathReturnNodeSet(ctx, xmlXPathNodeSetMerge(NULL, xml_node_set));
break;
}
default:
rb_raise(rb_eRuntimeError, "Invalid return type");
}
}
static void ruby_funcall(xmlXPathParserContextPtr ctx, int nargs)
{
VALUE handler = Qnil;
const char *function = NULL ;
assert(ctx);
assert(ctx->context);
assert(ctx->context->userData);
assert(ctx->context->function);
handler = (VALUE)(ctx->context->userData);
function = (const char*)(ctx->context->function);
Nokogiri_marshal_xpath_funcall_and_return_values(ctx, nargs, handler, function);
}
static xmlXPathFunction lookup( void *ctx,
const xmlChar * name,
const xmlChar* ns_uri )
{
VALUE xpath_handler = (VALUE)ctx;
if(rb_respond_to(xpath_handler, rb_intern((const char *)name)))
return ruby_funcall;
return NULL;
}
/*
* call-seq:
* evaluate(search_path, handler = nil)
*
* Evaluate the +search_path+ returning an XML::XPath object.
*/
static VALUE evaluate(int argc, VALUE *argv, VALUE self)
{
VALUE search_path, xpath_handler;
VALUE thing = Qnil;
xmlXPathContextPtr ctx;
xmlXPathObjectPtr xpath;
xmlChar *query;
VALUE error_list = rb_ary_new();
Data_Get_Struct(self, xmlXPathContext, ctx);
if(rb_scan_args(argc, argv, "11", &search_path, &xpath_handler) == 1)
xpath_handler = Qnil;
query = (xmlChar *)StringValueCStr(search_path);
if(Qnil != xpath_handler) {
/* FIXME: not sure if this is the correct place to shove private data. */
ctx->userData = (void *)xpath_handler;
xmlXPathRegisterFuncLookup(ctx, lookup, (void *)xpath_handler);
}
xmlSetStructuredErrorFunc((void*)error_list, Nokogiri_error_array_pusher);
xmlSetGenericErrorFunc((void*)error_list, Nokogiri_generic_error_array_pusher);
xpath = xmlXPathEvalExpression(query, ctx);
xmlSetStructuredErrorFunc(NULL, NULL);
xmlSetGenericErrorFunc(NULL, NULL);
if(xpath == NULL) {
rb_exc_raise(rb_ary_entry(error_list, -1));
}
assert(ctx->doc);
assert(DOC_RUBY_OBJECT_TEST(ctx->doc));
switch(xpath->type) {
case XPATH_STRING:
thing = NOKOGIRI_STR_NEW2(xpath->stringval);
xmlFree(xpath->stringval);
break;
case XPATH_NODESET:
thing = Nokogiri_wrap_xml_node_set(xpath->nodesetval,
DOC_RUBY_OBJECT(ctx->doc));
break;
case XPATH_NUMBER:
thing = rb_float_new(xpath->floatval);
break;
case XPATH_BOOLEAN:
thing = xpath->boolval == 1 ? Qtrue : Qfalse;
break;
default:
thing = Nokogiri_wrap_xml_node_set(NULL, DOC_RUBY_OBJECT(ctx->doc));
}
xmlXPathFreeNodeSetList(xpath);
return thing;
}
/*
* call-seq:
* new(node)
*
* Create a new XPathContext with +node+ as the reference point.
*/
static VALUE new(VALUE klass, VALUE nodeobj)
{
xmlNodePtr node;
xmlXPathContextPtr ctx;
VALUE self;
xmlXPathInit();
Data_Get_Struct(nodeobj, xmlNode, node);
ctx = xmlXPathNewContext(node->doc);
ctx->node = node;
self = Data_Wrap_Struct(klass, 0, deallocate, ctx);
/*rb_iv_set(self, "@xpath_handler", Qnil); */
return self;
}
VALUE cNokogiriXmlXpathContext;
void init_xml_xpath_context(void)
{
VALUE module = rb_define_module("Nokogiri");
/*
* Nokogiri::XML
*/
VALUE xml = rb_define_module_under(module, "XML");
/*
* XPathContext is the entry point for searching a Document by using XPath.
*/
VALUE klass = rb_define_class_under(xml, "XPathContext", rb_cObject);
cNokogiriXmlXpathContext = klass;
rb_define_singleton_method(klass, "new", new, 1);
rb_define_method(klass, "evaluate", evaluate, -1);
rb_define_method(klass, "register_variable", register_variable, 2);
rb_define_method(klass, "register_ns", register_ns, 2);
}