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Contents
/* $Id: rxml_xpath.c 461 2008-07-15 21:35:56Z cfis $ */
/* Please see the LICENSE file for copyright and distribution information */
#include "ruby_libxml.h"
#include "ruby_xml_xpath.h"
#include "ruby_xml_xpath_expression.h"
/*
* Document-class: LibXML::XML::XPath::Expression
*
* The XML::XPath::Expression class is used to compile
* XPath expressions so they can be parsed only once
* but reused multiple times.
*
* doc = XML::Document.string(IO.read('some xml file'))
* expr = XPath::Expression.new('//first')
* doc.root.each do |node|
* result = node.find(expr) # many, many, many times
* # ...
* end
*/
VALUE cXMLXPathExpression;
static void
rxml_xpath_expression_free(xmlXPathCompExprPtr expr) {
xmlXPathFreeCompExpr(expr);
}
static VALUE
rxml_xpath_expression_alloc(VALUE klass) {
return Data_Wrap_Struct(cXMLXPathExpression,
NULL,
rxml_xpath_expression_free,
NULL);
}
/* call-seq:
* XPath::Expression.new(expression) -> XPath::Expression
*
* Compiled XPatch expression. Work faster when find called many times
* same expression.
*
* doc = XML::Document.string('<header><first>hi</first></header>')
* expr = XPath::Expression.new('//first')
* nodes = doc.find(expr)
*/
static VALUE
rxml_xpath_expression_initialize(VALUE self, VALUE expression) {
xmlXPathCompExprPtr compexpr = xmlXPathCompile(StringValueCStr(expression));
if (compexpr == NULL) {
xmlErrorPtr xerror = xmlGetLastError();
rxml_raise(xerror);
}
DATA_PTR(self) = compexpr;
return self;
}
void
ruby_init_xml_xpath_expression(void) {
cXMLXPathExpression = rb_define_class_under(mXPath, "Expression", rb_cObject);
rb_define_alloc_func(cXMLXPathExpression, rxml_xpath_expression_alloc);
rb_define_singleton_method(rb_cRegexp, "compile", rb_class_new_instance, 1);
rb_define_method(cXMLXPathExpression, "initialize", rxml_xpath_expression_initialize, 1);
}
Version data entries
4 entries across 4 versions & 1 rubygems