//
// System.Xml.XPath.XPathNavigator
//
// Author:
// Jason Diamond (jason@injektilo.org)
// Atsushi Enomoto (atsushi@ximian.com)
//
// (C) 2002 Jason Diamond http://injektilo.org/
// (C) 2004 Novell Inc.
//
//
// 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;
#if NET_2_0
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
#endif
using System.IO;
using System.Xml;
using System.Xml.Schema;
using Mono.Xml.XPath;
#if NET_2_0
using NSResolverSystem.Xml.IXmlNamespaceResolver;
#else
using NSResolverSystem.Xml.XmlNamespaceManager;
#endif
namespace System.Xml.XPath{
#if NET_2_0
public abstract class XPathNavigator : XPathItem,
ICloneable, IXPathNavigable, IXmlNamespaceResolver
#else
public abstract class XPathNavigator : ICloneable
#endif
{
class EnumerableIterator : XPathNodeIterator
{
IEnumerable source;
IEnumerator e;
int pos;
public EnumerableIterator (IEnumerable source, int pos)
{
this.source = source;
for (int i = 0; i < pos; i++)
MoveNext ();
}
public override XPathNodeIterator Clone ()
{
return new EnumerableIterator (source, pos);
}
public override bool MoveNext ()
{
if (e == null)
e = source.GetEnumerator ();
if (!e.MoveNext ())
return false;
pos++;
return true;
}
public override int CurrentPosition {
get { return pos; }
}
public override XPathNavigator Current {
get { return pos == 0 ? null : (XPathNavigator) e.Current; }
}
}
#region Static members
#if NET_2_0
public static IEqualityComparer NavigatorComparer {
get { return XPathNavigatorComparer.Instance; }
}
#endif
#endregion
#region Constructor
protected XPathNavigator ()
{
}
#endregion
#region Properties
public abstract string BaseURI { get; }
#if NET_2_0
public virtual bool CanEdit {
get { return false; }
}
public virtual bool HasAttributes {
get {
if (!MoveToFirstAttribute ())
return false;
MoveToParent ();
return true;
}
}
public virtual bool HasChildren {
get {
if (!MoveToFirstChild ())
return false;
MoveToParent ();
return true;
}
}
#else
public abstract bool HasAttributes { get; }
public abstract bool HasChildren { get; }
#endif
public abstract bool IsEmptyElement { get; }
public abstract string LocalName { get; }
public abstract string Name { get; }
public abstract string NamespaceURI { get; }
public abstract XmlNameTable NameTable { get; }
public abstract XPathNodeType NodeType { get; }
public abstract string Prefix { get; }
#if NET_2_0
public virtual string XmlLang {
get {
XPathNavigator nav = Clone ();
switch (nav.NodeType) {
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
nav.MoveToParent ();
break;
}
do {
if (nav.MoveToAttribute ("lang", "http://www.w3.org/XML/1998/namespace"))
return nav.Value;
} while (nav.MoveToParent ());
return String.Empty;
}
}
#else
public abstract string Value { get; }
public abstract string XmlLang { get; }
#endif
#endregion
#region Methods
public abstract XPathNavigator Clone ();
public virtual XmlNodeOrder ComparePosition (XPathNavigator nav)
{
if (IsSamePosition (nav))
return XmlNodeOrder.Same;
// quick check for direct descendant
if (IsDescendant (nav))
return XmlNodeOrder.Before;
// quick check for direct ancestor
if (nav.IsDescendant (this))
return XmlNodeOrder.After;
XPathNavigator nav1 = Clone ();
XPathNavigator nav2 = nav.Clone ();
// check if document instance is the same.
nav1.MoveToRoot ();
nav2.MoveToRoot ();
if (!nav1.IsSamePosition (nav2))
return XmlNodeOrder.Unknown;
nav1.MoveTo (this);
nav2.MoveTo (nav);
int depth1 = 0;
while (nav1.MoveToParent ())
depth1++;
nav1.MoveTo (this);
int depth2 = 0;
while (nav2.MoveToParent ())
depth2++;
nav2.MoveTo (nav);
// find common parent depth
int common = depth1;
for (;common > depth2; common--)
nav1.MoveToParent ();
for (int i = depth2; i > common; i--)
nav2.MoveToParent ();
while (!nav1.IsSamePosition (nav2)) {
nav1.MoveToParent ();
nav2.MoveToParent ();
common--;
}
// For each this and target, move to the node that is
// ancestor of the node and child of the common parent.
nav1.MoveTo (this);
for (int i = depth1; i > common + 1; i--)
nav1.MoveToParent ();
nav2.MoveTo (nav);
for (int i = depth2; i > common + 1; i--)
nav2.MoveToParent ();
// Those children of common parent are comparable.
// namespace nodes precede to attributes, and they
// precede to other nodes.
if (nav1.NodeType == XPathNodeType.Namespace) {
if (nav2.NodeType != XPathNodeType.Namespace)
return XmlNodeOrder.Before;
while (nav1.MoveToNextNamespace ())
if (nav1.IsSamePosition (nav2))
return XmlNodeOrder.Before;
return XmlNodeOrder.After;
}
if (nav2.NodeType == XPathNodeType.Namespace)
return XmlNodeOrder.After;
if (nav1.NodeType == XPathNodeType.Attribute) {
if (nav2.NodeType != XPathNodeType.Attribute)
return XmlNodeOrder.Before;
while (nav1.MoveToNextAttribute ())
if (nav1.IsSamePosition (nav2))
return XmlNodeOrder.Before;
return XmlNodeOrder.After;
}
while (nav1.MoveToNext ())
if (nav1.IsSamePosition (nav2))
return XmlNodeOrder.Before;
return XmlNodeOrder.After;
}
public virtual XPathExpression Compile (string xpath)
{
return XPathExpression.Compile (xpath);
}
internal virtual XPathExpression Compile (string xpath, System.Xml.Xsl.IStaticXsltContext ctx)
{
return XPathExpression.Compile (xpath, null, ctx);
}
public virtual object Evaluate (string xpath)
{
return Evaluate (Compile (xpath));
}
public virtual object Evaluate (XPathExpression expr)
{
return Evaluate (expr, null);
}
public virtual object Evaluate (XPathExpression expr, XPathNodeIterator context)
{
return Evaluate (expr, context, null);
}
BaseIterator ToBaseIterator (XPathNodeIterator iter, NSResolver ctx)
{
BaseIterator i = iter as BaseIterator;
if (i == null)
i = new WrapperIterator (iter, ctx);
return i;
}
object Evaluate (XPathExpression expr, XPathNodeIterator context, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
if (context == null)
context = new NullIterator (this, ctx);
BaseIterator iterContext = ToBaseIterator (context, ctx);
iterContext.NamespaceManager = ctx;
return cexpr.Evaluate (iterContext);
}
internal XPathNodeIterator EvaluateNodeSet (XPathExpression expr, XPathNodeIterator context, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
if (context == null)
context = new NullIterator (this, cexpr.NamespaceManager);
BaseIterator iterContext = ToBaseIterator (context, ctx);
iterContext.NamespaceManager = ctx;
return cexpr.EvaluateNodeSet (iterContext);
}
internal string EvaluateString (XPathExpression expr, XPathNodeIterator context, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
if (context == null)
context = new NullIterator (this, cexpr.NamespaceManager);
BaseIterator iterContext = ToBaseIterator (context, ctx);
return cexpr.EvaluateString (iterContext);
}
internal double EvaluateNumber (XPathExpression expr, XPathNodeIterator context, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
if (context == null)
context = new NullIterator (this, cexpr.NamespaceManager);
BaseIterator iterContext = ToBaseIterator (context, ctx);
iterContext.NamespaceManager = ctx;
return cexpr.EvaluateNumber (iterContext);
}
internal bool EvaluateBoolean (XPathExpression expr, XPathNodeIterator context, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
if (context == null)
context = new NullIterator (this, cexpr.NamespaceManager);
BaseIterator iterContext = ToBaseIterator (context, ctx);
iterContext.NamespaceManager = ctx;
return cexpr.EvaluateBoolean (iterContext);
}
#if NET_2_0
public virtual string GetAttribute (string localName, string namespaceURI)
{
if (!MoveToAttribute (localName, namespaceURI))
return String.Empty;
string value = Value;
MoveToParent ();
return value;
}
public virtual string GetNamespace (string name)
{
if (!MoveToNamespace (name))
return String.Empty;
string value = Value;
MoveToParent ();
return value;
}
#else
public abstract string GetAttribute (string localName, string namespaceURI);
public abstract string GetNamespace (string name);
#endif
object ICloneable.Clone ()
{
return Clone ();
}
public virtual bool IsDescendant (XPathNavigator nav)
{
if (nav != null)
{
nav = nav.Clone ();
while (nav.MoveToParent ())
{
if (IsSamePosition (nav))
return true;
}
}
return false;
}
public abstract bool IsSamePosition (XPathNavigator other);
public virtual bool Matches (string xpath)
{
return Matches (Compile (xpath));
}
public virtual bool Matches (XPathExpression expr)
{
Expression e = ((CompiledExpression) expr).ExpressionNode;
if (e is ExprRoot)
return NodeType == XPathNodeType.Root;
NodeTest nt = e as NodeTest;
if (nt != null) {
switch (nt.Axis.Axis) {
case Axes.Child:
case Axes.Attribute:
break;
default:
throw new XPathException ("Only child and attribute pattern are allowed for a pattern.");
}
return nt.Match (((CompiledExpression)expr).NamespaceManager, this);
}
if (e is ExprFilter) {
do {
e = ((ExprFilter) e).LeftHandSide;
} while (e is ExprFilter);
if (e is NodeTest && !((NodeTest) e).Match (((CompiledExpression) expr).NamespaceManager, this))
return false;
}
XPathResultType resultType = e.ReturnType;
switch (resultType) {
case XPathResultType.Any:
case XPathResultType.NodeSet:
break;
default:
return false;
}
switch (e.EvaluatedNodeType) {
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
if (NodeType != e.EvaluatedNodeType)
return false;
break;
}
XPathNodeIterator nodes;
nodes = this.Select (expr);
while (nodes.MoveNext ()) {
if (IsSamePosition (nodes.Current))
return true;
}
// ancestors might select this node.
XPathNavigator navigator = Clone ();
while (navigator.MoveToParent ()) {
nodes = navigator.Select (expr);
while (nodes.MoveNext ()) {
if (IsSamePosition (nodes.Current))
return true;
}
}
return false;
}
public abstract bool MoveTo (XPathNavigator other);
#if NET_2_0
public virtual bool MoveToAttribute (string localName, string namespaceURI)
{
if (MoveToFirstAttribute ()) {
do {
if (LocalName == localName && NamespaceURI == namespaceURI)
return true;
} while (MoveToNextAttribute ());
MoveToParent ();
}
return false;
}
public virtual bool MoveToNamespace (string name)
{
if (MoveToFirstNamespace ()) {
do {
if (LocalName == name)
return true;
} while (MoveToNextNamespace ());
MoveToParent ();
}
return false;
}
/*
public virtual bool MoveToFirst ()
{
if (MoveToPrevious ()) {
// It would be able to invoke MoveToPrevious() until the end, but this way would be much faster
MoveToParent ();
MoveToFirstChild ();
return true;
}
return false;
}
*/
public virtual bool MoveToFirst ()
{
return MoveToFirstImpl ();
}
public virtual void MoveToRoot ()
{
while (MoveToParent ())
;
}
#else
public abstract bool MoveToAttribute (string localName, string namespaceURI);
public abstract bool MoveToNamespace (string name);
public abstract bool MoveToFirst ();
public abstract void MoveToRoot ();
#endif
internal bool MoveToFirstImpl ()
{
switch (NodeType) {
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
return false;
default:
if (!MoveToParent ())
return false;
// Follow these 2 steps so that we can skip
// some types of nodes .
MoveToFirstChild ();
return true;
}
}
public abstract bool MoveToFirstAttribute ();
public abstract bool MoveToFirstChild ();
public bool MoveToFirstNamespace ()
{
return MoveToFirstNamespace (XPathNamespaceScope.All);
}
public abstract bool MoveToFirstNamespace (XPathNamespaceScope namespaceScope);
public abstract bool MoveToId (string id);
public abstract bool MoveToNext ();
public abstract bool MoveToNextAttribute ();
public bool MoveToNextNamespace ()
{
return MoveToNextNamespace (XPathNamespaceScope.All);
}
public abstract bool MoveToNextNamespace (XPathNamespaceScope namespaceScope);
public abstract bool MoveToParent ();
public abstract bool MoveToPrevious ();
public virtual XPathNodeIterator Select (string xpath)
{
return Select (Compile (xpath));
}
public virtual XPathNodeIterator Select (XPathExpression expr)
{
return Select (expr, null);
}
internal XPathNodeIterator Select (XPathExpression expr, NSResolver ctx)
{
CompiledExpression cexpr = (CompiledExpression) expr;
if (ctx == null)
ctx = cexpr.NamespaceManager;
BaseIterator iter = new NullIterator (this, ctx);
return cexpr.EvaluateNodeSet (iter);
}
public virtual XPathNodeIterator SelectAncestors (XPathNodeType type, bool matchSelf)
{
Axes axis = (matchSelf) ? Axes.AncestorOrSelf : Axes.Ancestor;
return SelectTest (new NodeTypeTest (axis, type));
}
public virtual XPathNodeIterator SelectAncestors (string name, string namespaceURI, bool matchSelf)
{
if (name == null)
throw new ArgumentNullException ("name");
if (namespaceURI == null)
throw new ArgumentNullException ("namespaceURI");
Axes axis = (matchSelf) ? Axes.AncestorOrSelf : Axes.Ancestor;
XmlQualifiedName qname = new XmlQualifiedName (name, namespaceURI);
return SelectTest (new NodeNameTest (axis, qname, true));
}
static IEnumerable EnumerateChildren (XPathNavigator n, XPathNodeType type)
{
if (!n.MoveToFirstChild ())
yield break;
n.MoveToParent ();
XPathNavigator nav = n.Clone ();
nav.MoveToFirstChild ();
XPathNavigator nav2 = null;
do {
if (type == XPathNodeType.All || nav.NodeType == type) {
if (nav2 == null)
nav2 = nav.Clone ();
else
nav2.MoveTo (nav);
yield return nav2;
}
} while (nav.MoveToNext ());
}
public virtual XPathNodeIterator SelectChildren (XPathNodeType type)
{
#if false
return SelectTest (new NodeTypeTest (Axes.Child, type));
#else
return new WrapperIterator (new EnumerableIterator (EnumerateChildren (this, type), 0), null);
// FIXME: make it work i.e. remove dependency on BaseIterator
// return new EnumerableIterator (EnumerateChildren (this, type), 0);
#endif
}
static IEnumerable EnumerateChildren (XPathNavigator n, string name, string ns)
{
if (!n.MoveToFirstChild ())
yield break;
n.MoveToParent ();
XPathNavigator nav = n.Clone ();
nav.MoveToFirstChild ();
XPathNavigator nav2 = nav.Clone ();
do {
if ((name == String.Empty || nav.LocalName == name) && (ns == String.Empty || nav.NamespaceURI == ns)) {
nav2.MoveTo (nav);
yield return nav2;
}
} while (nav.MoveToNext ());
}
public virtual XPathNodeIterator SelectChildren (string name, string namespaceURI)
{
if (name == null)
throw new ArgumentNullException ("name");
if (namespaceURI == null)
throw new ArgumentNullException ("namespaceURI");
#if false
Axes axis = Axes.Child;
XmlQualifiedName qname = new XmlQualifiedName (name, namespaceURI);
return SelectTest (new NodeNameTest (axis, qname, true));
#else
return new WrapperIterator (new EnumerableIterator (EnumerateChildren (this, name, namespaceURI), 0), null);
#endif
}
public virtual XPathNodeIterator SelectDescendants (XPathNodeType type, bool matchSelf)
{
Axes axis = (matchSelf) ? Axes.DescendantOrSelf : Axes.Descendant;
return SelectTest (new NodeTypeTest (axis, type));
}
public virtual XPathNodeIterator SelectDescendants (string name, string namespaceURI, bool matchSelf)
{
if (name == null)
throw new ArgumentNullException ("name");
if (namespaceURI == null)
throw new ArgumentNullException ("namespaceURI");
Axes axis = (matchSelf) ? Axes.DescendantOrSelf : Axes.Descendant;
XmlQualifiedName qname = new XmlQualifiedName (name, namespaceURI);
return SelectTest (new NodeNameTest (axis, qname, true));
}
internal XPathNodeIterator SelectTest (NodeTest test)
{
return test.EvaluateNodeSet (new NullIterator (this));
}
public override string ToString ()
{
return Value;
}
#endregion
#if NET_2_0
public virtual bool CheckValidity (XmlSchemaSet schemas, ValidationEventHandler handler)
{
XmlReaderSettings settings = new XmlReaderSettings ();
settings.NameTable = NameTable;
settings.SetSchemas (schemas);
settings.ValidationEventHandler += handler;
settings.ValidationType = ValidationType.Schema;
try {
XmlReader r = XmlReader.Create (
ReadSubtree (), settings);
while (!r.EOF)
r.Read ();
} catch (XmlSchemaValidationException) {
return false;
}
return true;
}
public virtual XPathNavigator CreateNavigator ()
{
return Clone ();
}
public virtual object Evaluate (string xpath, IXmlNamespaceResolver nsResolver)
{
return Evaluate (Compile (xpath), null, nsResolver);
}
public virtual IDictionary<string, string> GetNamespacesInScope (XmlNamespaceScope scope)
{
IDictionary<string, string> table = new Dictionary<string, string> ();
XPathNamespaceScope xpscope =
scope == XmlNamespaceScope.Local ?
XPathNamespaceScope.Local :
scope == XmlNamespaceScope.ExcludeXml ?
XPathNamespaceScope.ExcludeXml :
XPathNamespaceScope.All;
XPathNavigator nav = Clone ();
if (nav.NodeType != XPathNodeType.Element)
nav.MoveToParent ();
if (!nav.MoveToFirstNamespace (xpscope))
return table;
do {
table.Add (nav.Name, nav.Value);
} while (nav.MoveToNextNamespace (xpscope));
return table;
}
#endif
#if NET_2_0
public
#else
internal
#endif
virtual string LookupNamespace (string prefix)
{
XPathNavigator nav = Clone ();
if (nav.NodeType != XPathNodeType.Element)
nav.MoveToParent ();
if (nav.MoveToNamespace (prefix))
return nav.Value;
return null;
}
#if NET_2_0
public
#else
internal
#endif
virtual string LookupPrefix (string namespaceUri)
{
XPathNavigator nav = Clone ();
if (nav.NodeType != XPathNodeType.Element)
nav.MoveToParent ();
if (!nav.MoveToFirstNamespace ())
return null;
do {
if (nav.Value == namespaceUri)
return nav.Name;
} while (nav.MoveToNextNamespace ());
return null;
}
private bool MoveTo (XPathNodeIterator iter)
{
if (iter.MoveNext ()) {
MoveTo (iter.Current);
return true;
}
else
return false;
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToChild (XPathNodeType type)
{
return MoveTo (SelectChildren (type));
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToChild (string localName, string namespaceURI)
{
return MoveTo (SelectChildren (localName, namespaceURI));
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToNext (string localName, string namespaceURI)
{
XPathNavigator nav = Clone ();
while (nav.MoveToNext ()) {
if (nav.LocalName == localName &&
nav.NamespaceURI == namespaceURI) {
MoveTo (nav);
return true;
}
}
return false;
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToNext (XPathNodeType type)
{
XPathNavigator nav = Clone ();
while (nav.MoveToNext ()) {
if (type == XPathNodeType.All || nav.NodeType == type) {
MoveTo (nav);
return true;
}
}
return false;
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToFollowing (string localName,
string namespaceURI)
{
return MoveToFollowing (localName, namespaceURI, null);
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToFollowing (string localName,
string namespaceURI, XPathNavigator end)
{
if (localName == null)
throw new ArgumentNullException ("localName");
if (namespaceURI == null)
throw new ArgumentNullException ("namespaceURI");
localName = NameTable.Get (localName);
if (localName == null)
return false;
namespaceURI = NameTable.Get (namespaceURI);
if (namespaceURI == null)
return false;
XPathNavigator nav = Clone ();
switch (nav.NodeType) {
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
nav.MoveToParent ();
break;
}
do {
if (!nav.MoveToFirstChild ()) {
do {
if (!nav.MoveToNext ()) {
if (!nav.MoveToParent ())
return false;
}
else
break;
} while (true);
}
if (end != null && end.IsSamePosition (nav))
return false;
if (object.ReferenceEquals (localName, nav.LocalName) &&
object.ReferenceEquals (namespaceURI, nav.NamespaceURI)) {
MoveTo (nav);
return true;
}
} while (true);
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToFollowing (XPathNodeType type)
{
return MoveToFollowing (type, null);
}
#if NET_2_0
public
#else
internal
#endif
virtual bool MoveToFollowing (XPathNodeType type,
XPathNavigator end)
{
if (type == XPathNodeType.Root)
return false; // will never match
XPathNavigator nav = Clone ();
switch (nav.NodeType) {
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
nav.MoveToParent ();
break;
}
do {
if (!nav.MoveToFirstChild ()) {
do {
if (!nav.MoveToNext ()) {
if (!nav.MoveToParent ())
return false;
}
else
break;
} while (true);
}
if (end != null && end.IsSamePosition (nav))
return false;
if (type == XPathNodeType.All || nav.NodeType == type) {
MoveTo (nav);
return true;
}
} while (true);
}
#if NET_2_0
public virtual XmlReader ReadSubtree ()
{
switch (NodeType) {
case XPathNodeType.Element:
case XPathNodeType.Root:
return new XPathNavigatorReader (this);
default:
throw new InvalidOperationException (String.Format ("NodeType {0} is not supported to read as a subtree of an XPathNavigator.", NodeType));
}
}
public virtual XPathNodeIterator Select (string xpath, IXmlNamespaceResolver nsResolver)
{
return Select (Compile (xpath), nsResolver);
}
public virtual XPathNavigator SelectSingleNode (string xpath)
{
return SelectSingleNode (xpath, null);
}
public virtual XPathNavigator SelectSingleNode (string xpath, IXmlNamespaceResolver nsResolver)
{
XPathExpression expr = Compile (xpath);
expr.SetContext (nsResolver);
return SelectSingleNode (expr);
}
public virtual XPathNavigator SelectSingleNode (XPathExpression expression)
{
XPathNodeIterator iter = Select (expression);
if (iter.MoveNext ())
return iter.Current;
else
return null;
}
// it is not very effective code but should just work
public override object ValueAs (Type type, IXmlNamespaceResolver nsResolver)
{
return new XmlAtomicValue (Value, XmlSchemaSimpleType.XsString).ValueAs (type, nsResolver);
}
public virtual void WriteSubtree (XmlWriter writer)
{
writer.WriteNode (this, false);
}
static readonly char [] escape_text_chars =
new char [] {'&', '<', '>'};
static readonly char [] escape_attr_chars =
new char [] {'"', '&', '<', '>', '\r', '\n'};
static string EscapeString (string value, bool attr)
{
StringBuilder sb = null;
char [] escape = attr ? escape_attr_chars : escape_text_chars;
if (value.IndexOfAny (escape) < 0)
return value;
sb = new StringBuilder (value, value.Length + 10);
if (attr)
sb.Replace ("\"", """);
sb.Replace ("<", "<");
sb.Replace (">", ">");
if (attr) {
sb.Replace ("\r\n", " ");
sb.Replace ("\r", " ");
sb.Replace ("\n", " ");
}
return sb.ToString ();
}
public virtual string InnerXml {
get {
switch (NodeType) {
case XPathNodeType.Element:
case XPathNodeType.Root:
break;
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
return EscapeString (Value, true);
case XPathNodeType.Text:
case XPathNodeType.Whitespace:
case XPathNodeType.SignificantWhitespace:
return String.Empty;
case XPathNodeType.ProcessingInstruction:
case XPathNodeType.Comment:
return Value;
}
XmlReader r = ReadSubtree ();
r.Read (); // start
// skip the element itself (or will reach to
// EOF if other than element) unless writing
// doc itself
int depth = r.Depth;
if (NodeType != XPathNodeType.Root)
r.Read ();
else
depth = -1; // for Root, it should consume the entire tree, so no depth check is done.
StringWriter sw = new StringWriter ();
XmlWriterSettings s = new XmlWriterSettings ();
s.Indent = true;
s.ConformanceLevel = ConformanceLevel.Fragment;
s.OmitXmlDeclaration = true;
XmlWriter xtw = XmlWriter.Create (sw, s);
while (!r.EOF && r.Depth > depth)
xtw.WriteNode (r, false);
return sw.ToString ();
}
set {
DeleteChildren ();
if (NodeType == XPathNodeType.Attribute) {
SetValue (value);
return;
}
AppendChild (value);
}
}
public override sealed bool IsNode {
get { return true; }
}
public virtual string OuterXml {
get {
switch (NodeType) {
case XPathNodeType.Attribute:
return String.Concat (
Prefix,
Prefix.Length > 0 ? ":" : String.Empty,
LocalName,
"=\"",
EscapeString (Value, true),
"\"");
case XPathNodeType.Namespace:
return String.Concat (
"xmlns",
LocalName.Length > 0 ? ":" : String.Empty,
LocalName,
"=\"",
EscapeString (Value, true),
"\"");
case XPathNodeType.Text:
return EscapeString (Value, false);
case XPathNodeType.Whitespace:
case XPathNodeType.SignificantWhitespace:
return Value;
}
XmlWriterSettings s = new XmlWriterSettings ();
s.Indent = true;
s.OmitXmlDeclaration = true;
s.ConformanceLevel = ConformanceLevel.Fragment;
StringBuilder sb = new StringBuilder ();
using (XmlWriter w = XmlWriter.Create (sb, s)) {
WriteSubtree (w);
}
return sb.ToString ();
}
set {
switch (NodeType) {
case XPathNodeType.Root:
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
throw new XmlException ("Setting OuterXml Root, Attribute and Namespace is not supported.");
}
DeleteSelf ();
AppendChild (value);
MoveToFirstChild ();
}
}
public virtual IXmlSchemaInfo SchemaInfo {
get {
return null;
}
}
public override object TypedValue {
get {
switch (NodeType) {
case XPathNodeType.Element:
case XPathNodeType.Attribute:
if (XmlType == null)
break;
XmlSchemaDatatype dt = XmlType.Datatype;
if (dt == null)
break;
return dt.ParseValue (Value, NameTable, this as IXmlNamespaceResolver);
}
return Value;
}
}
public virtual object UnderlyingObject {
get { return null; }
}
public override bool ValueAsBoolean {
get { return XQueryConvert.StringToBoolean (Value); }
}
public override DateTime ValueAsDateTime {
get { return XmlConvert.ToDateTime (Value); }
}
public override double ValueAsDouble {
get { return XQueryConvert.StringToDouble (Value); }
}
public override int ValueAsInt {
get { return XQueryConvert.StringToInt (Value); }
}
public override long ValueAsLong {
get { return XQueryConvert.StringToInteger (Value); }
}
public override Type ValueType {
get {
return SchemaInfo != null &&
SchemaInfo.SchemaType != null &&
SchemaInfo.SchemaType.Datatype != null ?
SchemaInfo.SchemaType.Datatype.ValueType
: null;
}
}
public override XmlSchemaType XmlType {
get {
if (SchemaInfo != null)
return SchemaInfo.SchemaType;
return null;
}
}
private XmlReader CreateFragmentReader (string fragment)
{
XmlReaderSettings settings = new XmlReaderSettings ();
settings.ConformanceLevel = ConformanceLevel.Fragment;
XmlNamespaceManager nsmgr = new XmlNamespaceManager (NameTable);
foreach (KeyValuePair<string,string> nss in GetNamespacesInScope (XmlNamespaceScope.All))
nsmgr.AddNamespace (nss.Key, nss.Value);
return XmlReader.Create (
new StringReader (fragment),
settings,
new XmlParserContext (NameTable, nsmgr, null, XmlSpace.None));
}
// must override it.
public virtual XmlWriter AppendChild ()
{
throw new NotSupportedException ();
}
public virtual void AppendChild (
string xmlFragments)
{
AppendChild (CreateFragmentReader (xmlFragments));
}
public virtual void AppendChild (
XmlReader reader)
{
XmlWriter w = AppendChild ();
while (!reader.EOF)
w.WriteNode (reader, false);
w.Close ();
}
public virtual void AppendChild (
XPathNavigator nav)
{
AppendChild (new XPathNavigatorReader (nav));
}
public virtual void AppendChildElement (string prefix, string name, string ns, string value)
{
XmlWriter xw = AppendChild ();
xw.WriteStartElement (prefix, name, ns);
xw.WriteString (value);
xw.WriteEndElement ();
xw.Close ();
}
public virtual void CreateAttribute (string prefix, string localName, string namespaceURI, string value)
{
using (XmlWriter w = CreateAttributes ()) {
w.WriteAttributeString (prefix, localName, namespaceURI, value);
}
}
// must override it.
public virtual XmlWriter CreateAttributes ()
{
throw new NotSupportedException ();
}
// must override it.
public virtual void DeleteSelf ()
{
throw new NotSupportedException ();
}
// must override it.
public virtual void DeleteRange (XPathNavigator nav)
{
throw new NotSupportedException ();
}
public virtual XmlWriter ReplaceRange (XPathNavigator nav)
{
throw new NotSupportedException ();
}
public virtual XmlWriter InsertAfter ()
{
switch (NodeType) {
case XPathNodeType.Root:
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
throw new InvalidOperationException (String.Format ("Insertion after {0} is not allowed.", NodeType));
}
XPathNavigator nav = Clone ();
if (nav.MoveToNext ())
return nav.InsertBefore ();
else if (nav.MoveToParent ())
return nav.AppendChild ();
else
throw new InvalidOperationException ("Could not move to parent to insert sibling node");
}
public virtual void InsertAfter (string xmlFragments)
{
InsertAfter (CreateFragmentReader (xmlFragments));
}
public virtual void InsertAfter (XmlReader reader)
{
using (XmlWriter w = InsertAfter ()) {
w.WriteNode (reader, false);
}
}
public virtual void InsertAfter (XPathNavigator nav)
{
InsertAfter (new XPathNavigatorReader (nav));
}
public virtual XmlWriter InsertBefore ()
{
throw new NotSupportedException ();
}
public virtual void InsertBefore (string xmlFragments)
{
InsertBefore (CreateFragmentReader (xmlFragments));
}
public virtual void InsertBefore (XmlReader reader)
{
using (XmlWriter w = InsertBefore ()) {
w.WriteNode (reader, false);
}
}
public virtual void InsertBefore (XPathNavigator nav)
{
InsertBefore (new XPathNavigatorReader (nav));
}
public virtual void InsertElementAfter (string prefix,
string localName, string namespaceURI, string value)
{
using (XmlWriter w = InsertAfter ()) {
w.WriteElementString (prefix, localName, namespaceURI, value);
}
}
public virtual void InsertElementBefore (string prefix,
string localName, string namespaceURI, string value)
{
using (XmlWriter w = InsertBefore ()) {
w.WriteElementString (prefix, localName, namespaceURI, value);
}
}
public virtual XmlWriter PrependChild ()
{
XPathNavigator nav = Clone ();
if (nav.MoveToFirstChild ())
return nav.InsertBefore ();
else
return AppendChild ();
}
public virtual void PrependChild (string xmlFragments)
{
PrependChild (CreateFragmentReader (xmlFragments));
}
public virtual void PrependChild (XmlReader reader)
{
using (XmlWriter w = PrependChild ()) {
w.WriteNode (reader, false);
}
}
public virtual void PrependChild (XPathNavigator nav)
{
PrependChild (new XPathNavigatorReader (nav));
}
public virtual void PrependChildElement (string prefix,
string localName, string namespaceURI, string value)
{
using (XmlWriter w = PrependChild ()) {
w.WriteElementString (prefix, localName, namespaceURI, value);
}
}
public virtual void ReplaceSelf (string xmlFragment)
{
ReplaceSelf (CreateFragmentReader (xmlFragment));
}
// must override it.
public virtual void ReplaceSelf (XmlReader reader)
{
throw new NotSupportedException ();
}
public virtual void ReplaceSelf (XPathNavigator navigator)
{
ReplaceSelf (new XPathNavigatorReader (navigator));
}
// Dunno the exact purpose, but maybe internal editor use
[MonoTODO]
public virtual void SetTypedValue (object value)
{
throw new NotSupportedException ();
}
public virtual void SetValue (string value)
{
throw new NotSupportedException ();
}
private void DeleteChildren ()
{
switch (NodeType) {
case XPathNodeType.Namespace:
throw new InvalidOperationException ("Removing namespace node content is not supported.");
case XPathNodeType.Attribute:
return;
case XPathNodeType.Text:
case XPathNodeType.SignificantWhitespace:
case XPathNodeType.Whitespace:
case XPathNodeType.ProcessingInstruction:
case XPathNodeType.Comment:
DeleteSelf ();
return;
}
if (!HasChildren)
return;
XPathNavigator nav = Clone ();
nav.MoveToFirstChild ();
while (!nav.IsSamePosition (this))
nav.DeleteSelf ();
}
#endif
}
}
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