Jo Shields a575963da9 Imported Upstream version 3.6.0
Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14
2014-08-13 10:39:27 +01:00

96 lines
3.2 KiB
C#

//
// Authors:
// Atsushi Enomoto
//
// Copyright 2007 Novell (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
namespace System.Xml.XPath
{
public static class Extensions
{
public static XPathNavigator CreateNavigator (this XNode node)
{
return CreateNavigator (node, new NameTable ());
}
public static XPathNavigator CreateNavigator (this XNode node, XmlNameTable nameTable)
{
return new XNodeNavigator (node, nameTable);
}
public static object XPathEvaluate (this XNode node, string expression)
{
return XPathEvaluate (node, expression, null);
}
public static object XPathEvaluate (this XNode node, string expression, IXmlNamespaceResolver resolver)
{
object navigationResult = CreateNavigator (node).Evaluate (expression, resolver);
if (!(navigationResult is XPathNodeIterator))
return navigationResult;
return GetUnderlyingXObjects((XPathNodeIterator) navigationResult);
}
private static IEnumerable<object> GetUnderlyingXObjects(XPathNodeIterator nodeIterator)
{
foreach (XPathNavigator nav in nodeIterator)
{
yield return nav.UnderlyingObject;
}
}
public static XElement XPathSelectElement (this XNode node, string expression)
{
return XPathSelectElement (node, expression, null);
}
public static XElement XPathSelectElement (this XNode node, string expression, IXmlNamespaceResolver resolver)
{
XPathNavigator nav = CreateNavigator (node).SelectSingleNode (expression, resolver);
if (nav == null)
return null;
return nav.UnderlyingObject as XElement;
}
public static IEnumerable<XElement> XPathSelectElements (this XNode node, string expression)
{
return XPathSelectElements (node, expression, null);
}
public static IEnumerable<XElement> XPathSelectElements (this XNode node, string expression, IXmlNamespaceResolver resolver)
{
XPathNodeIterator iter = CreateNavigator (node).Select (expression, resolver);
foreach (XPathNavigator nav in iter){
if (nav.UnderlyingObject is XElement)
yield return (XElement) nav.UnderlyingObject;
}
}
}
}