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/* $Id: ruby_xml_xpointer.c 188 2007-09-24 01:43:21Z danj $ */
/* Please see the LICENSE file for copyright and distribution information */
#include "libxml.h"
#include "ruby_xml_xpointer.h"
VALUE cXMLXPointer;
VALUE eXMLXPointerInvalidExpression;
VALUE
ruby_xml_xpointer_point(VALUE class, VALUE rnode, VALUE xptr_str) {
#ifdef LIBXML_XPTR_ENABLED
ruby_xml_node *node;
xmlXPathContextPtr ctxt;
VALUE rxptr_xpth_ctxt, rxxp;
xmlXPathObjectPtr xpath;
Check_Type(xptr_str, T_STRING);
if (rb_obj_is_kind_of(rnode, cXMLNode) == Qfalse)
rb_raise(rb_eTypeError, "require an XML::Node object");
Data_Get_Struct(rnode, ruby_xml_node, node);
rxptr_xpth_ctxt =
ruby_xml_xpath_context_wrap(ctxt=xmlXPtrNewContext(node->node->doc, node->node, NULL));
if (NIL_P(rxptr_xpth_ctxt))
return(Qnil);
xpath = xmlXPtrEval((xmlChar*)StringValuePtr(xptr_str), ctxt);
if (xpath == NULL)
rb_raise(eXMLXPointerInvalidExpression, "invalid xpointer expression");
rxxp = ruby_xml_xpath_object_wrap(xpath);
return(rxxp);
#else
rb_warn("libxml was compiled without XPointer support");
return(Qfalse);
#endif
}
VALUE
ruby_xml_xpointer_point2(VALUE node, VALUE xptr_str) {
return(ruby_xml_xpointer_point(cXMLXPointer, node, xptr_str));
}
/*
* call-seq:
* XML::XPointer.range(start_node, end_node) => xpath
*
* Create an xpath representing the range between the supplied
* start and end node.
*/
VALUE
ruby_xml_xpointer_range(VALUE class, VALUE rstart, VALUE rend) {
#ifdef LIBXML_XPTR_ENABLED
ruby_xml_node *start, *end;
VALUE rxxp;
xmlXPathObjectPtr xpath;
if (rb_obj_is_kind_of(rstart, cXMLNode) == Qfalse)
rb_raise(rb_eTypeError, "require an XML::Node object as a starting point");
if (rb_obj_is_kind_of(rend, cXMLNode) == Qfalse)
rb_raise(rb_eTypeError, "require an XML::Node object as an ending point");
Data_Get_Struct(rstart, ruby_xml_node, start);
if (start->node == NULL)
return(Qnil);
Data_Get_Struct(rend, ruby_xml_node, end);
if (end->node == NULL)
return(Qnil);
xpath = xmlXPtrNewRangeNodes(start->node, end->node);
if (xpath == NULL)
rb_fatal("You shouldn't be able to have this happen");
rxxp = ruby_xml_xpath_object_wrap(xpath);
return(rxxp);
#else
rb_warn("libxml was compiled without XPointer support");
return(Qfalse);
#endif
}
// Rdoc needs to know
#ifdef RDOC_NEVER_DEFINED
mXML = rb_define_module("XML");
#endif
void
ruby_init_xml_xpointer(void) {
cXMLXPointer = rb_define_class_under(mXML, "XPointer", rb_cObject);
eXMLXPointerInvalidExpression = rb_define_class_under(cXMLXPointer, "InvalidExpression", eXMLError);
rb_define_singleton_method(cXMLXPointer, "range", ruby_xml_xpointer_range, 2);
}
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