427 lines
16 KiB
C#
427 lines
16 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="RtfNavigator.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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//------------------------------------------------------------------------------
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using System;
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using System.Threading;
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using System.IO;
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using System.Collections;
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using System.Globalization;
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using System.Text;
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using System.Diagnostics;
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using System.Xml;
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using System.Xml.XPath;
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using System.Xml.Schema;
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namespace System.Xml.Xsl.Runtime {
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/// <summary>
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/// RtfNavigators store Xslt result-tree-fragments. At runtime, the Xslt library tests to see if a Navigator
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/// is an RtfNavigator in order to enforce certain restrictions, such as prohibiting querying into Rtfs.
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/// Furthermore, Rtfs must store extra serialization information required in order to properly implement the
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/// Xslt disable-output-escaping flag.
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/// </summary>
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internal abstract class RtfNavigator : XPathNavigator {
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//-----------------------------------------------
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// RtfNavigator
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//-----------------------------------------------
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/// <summary>
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/// Preserve serialization hints when deep copying.
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/// </summary>
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public abstract void CopyToWriter(XmlWriter writer);
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/// <summary>
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/// Discard serialization hints and return a navigator that actually allows navigation.
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/// </summary>
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public abstract XPathNavigator ToNavigator();
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//-----------------------------------------------
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// XPathNavigator
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//-----------------------------------------------
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/// <summary>
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/// Get the XPath node type of the current node.
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/// </summary>
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public override XPathNodeType NodeType {
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get { return XPathNodeType.Root; }
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}
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/// <summary>
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/// Get the local name portion of the current node's name.
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/// </summary>
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public override string LocalName {
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get { return string.Empty; }
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}
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/// <summary>
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/// Get the namespace portion of the current node's name.
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/// </summary>
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public override string NamespaceURI {
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get { return string.Empty; }
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}
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/// <summary>
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/// Get the name of the current node.
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/// </summary>
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public override string Name {
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get { return string.Empty; }
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}
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/// <summary>
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/// Get the prefix portion of the current node's name.
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/// </summary>
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public override string Prefix {
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get { return string.Empty; }
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}
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/// <summary>
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/// Return true if this is an element which used a shortcut tag in its Xml 1.0 serialized form.
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/// </summary>
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public override bool IsEmptyElement {
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get { return false; }
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}
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/// <summary>
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/// Return the xml name table which was used to atomize all prefixes, local-names, and
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/// namespace uris in the document.
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/// </summary>
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public override XmlNameTable NameTable {
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get { throw new NotSupportedException(); }
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}
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/// <summary>
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/// Position the navigator on the first attribute of the current node and return true. If no attributes
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/// can be found, return false.
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/// </summary>
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public override bool MoveToFirstAttribute() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// If positioned on an attribute, move to its next sibling attribute. If no attributes can be found,
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/// return false.
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/// </summary>
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public override bool MoveToNextAttribute() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Position the navigator on the namespace within the specified scope. If no matching namespace
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/// can be found, return false.
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/// </summary>
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public override bool MoveToFirstNamespace(XPathNamespaceScope namespaceScope) {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Position the navigator on the next namespace within the specified scope. If no matching namespace
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/// can be found, return false.
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/// </summary>
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public override bool MoveToNextNamespace(XPathNamespaceScope namespaceScope) {
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throw new NotSupportedException();
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}
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/// <summary>
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/// If the current node is an attribute or namespace (not content), return false. Otherwise,
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/// move to the next content node. Return false if there are no more content nodes.
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/// </summary>
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public override bool MoveToNext() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// If the current node is an attribute or namespace (not content), return false. Otherwise,
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/// move to the previous (sibling) content node. Return false if there are no previous content nodes.
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/// </summary>
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public override bool MoveToPrevious() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Move to the first content-typed child of the current node. Return false if the current
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/// node has no content children.
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/// </summary>
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public override bool MoveToFirstChild() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Position the navigator on the parent of the current node. If the current node has no parent,
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/// return false.
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/// </summary>
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public override bool MoveToParent() {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Position to the navigator to the element whose id is equal to the specified "id" string.
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/// </summary>
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public override bool MoveToId(string id) {
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throw new NotSupportedException();
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}
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/// <summary>
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/// Returns true if this navigator is positioned to the same node as the "other" navigator. Returns false
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/// if not, or if the "other" navigator is not the same type as this navigator.
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/// </summary>
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public override bool IsSamePosition(XPathNavigator other) {
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throw new NotSupportedException();
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}
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}
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/// <summary>
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/// This navigator is a cursor over a cache that stores Xslt disable-output-escaping flags.
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/// </summary>
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internal sealed class RtfTreeNavigator : RtfNavigator {
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private XmlEventCache events;
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private NavigatorConstructor constr;
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private XmlNameTable nameTable;
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//-----------------------------------------------
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// Constructors
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//-----------------------------------------------
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/// <summary>
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/// Create a new navigator over the specified cache of Xml events.
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/// </summary>
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public RtfTreeNavigator(XmlEventCache events, XmlNameTable nameTable) {
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this.events = events;
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this.constr = new NavigatorConstructor();
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this.nameTable = nameTable;
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}
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/// <summary>
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/// Copy constructor.
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/// </summary>
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public RtfTreeNavigator(RtfTreeNavigator that) {
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this.events = that.events;
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this.constr = that.constr;
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this.nameTable = that.nameTable;
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}
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//-----------------------------------------------
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// RtfNavigator
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//-----------------------------------------------
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/// <summary>
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/// Preserve serialization hints when deep copying.
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/// </summary>
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public override void CopyToWriter(XmlWriter writer) {
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this.events.EventsToWriter(writer);
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}
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/// <summary>
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/// Discard serialization hints and return a navigator that actually allows navigation.
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/// </summary>
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public override XPathNavigator ToNavigator() {
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return this.constr.GetNavigator(this.events, this.nameTable);
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}
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//-----------------------------------------------
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// XPathItem
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//-----------------------------------------------
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/// <summary>
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/// Get the string value of the current node, computed using data model dm:string-value rules.
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/// If the node has a typed value, return the string representation of the value. If the node
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/// is not a parent type (comment, text, pi, etc.), get its simple text value. Otherwise,
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/// concatenate all text node descendants of the current node.
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/// </summary>
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public override string Value {
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get { return this.events.EventsToString(); }
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}
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//-----------------------------------------------
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// XPathNavigator
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//-----------------------------------------------
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/// <summary>
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/// Get the base URI of the Rtf.
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/// </summary>
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public override string BaseURI {
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get { return this.events.BaseUri; }
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}
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/// <summary>
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/// Create a copy of this navigator, positioned to the same node in the tree.
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/// </summary>
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public override XPathNavigator Clone() {
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return new RtfTreeNavigator(this);
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}
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/// <summary>
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/// Position this navigator to the same position as the "other" navigator. If the "other" navigator
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/// is not of the same type as this navigator, then return false.
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/// </summary>
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public override bool MoveTo(XPathNavigator other) {
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RtfTreeNavigator that = other as RtfTreeNavigator;
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if (that != null) {
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this.events = that.events;
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this.constr = that.constr;
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this.nameTable = that.nameTable;
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return true;
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}
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return false;
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}
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}
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/// <summary>
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/// This RtfNavigator specializes the case of a root node having a single text node child. This is a very common
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/// case, such as in <xsl:variable name="foo">bar</xsl:variable>.
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/// </summary>
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internal sealed class RtfTextNavigator : RtfNavigator {
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private string text, baseUri;
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private NavigatorConstructor constr;
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//-----------------------------------------------
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// Constructors
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//-----------------------------------------------
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/// <summary>
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/// Create a new navigator having a text node with value = "text" string.
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/// </summary>
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public RtfTextNavigator(string text, string baseUri) {
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this.text = text;
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this.baseUri = baseUri;
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this.constr = new NavigatorConstructor();
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}
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/// <summary>
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/// Copy constructor.
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/// </summary>
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public RtfTextNavigator(RtfTextNavigator that) {
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this.text = that.text;
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this.baseUri = that.baseUri;
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this.constr = that.constr;
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}
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//-----------------------------------------------
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// RtfNavigator
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//-----------------------------------------------
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/// <summary>
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/// Preserve serialization hints when deep copying.
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/// </summary>
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public override void CopyToWriter(XmlWriter writer) {
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writer.WriteString(Value);
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}
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/// <summary>
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/// Discard serialization hints and return a navigator that actually allows navigation.
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/// </summary>
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public override XPathNavigator ToNavigator() {
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return this.constr.GetNavigator(this.text, this.baseUri, new NameTable());
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}
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//-----------------------------------------------
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// XPathItem
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//-----------------------------------------------
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/// <summary>
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/// Get the string value of the current node, computed using data model dm:string-value rules.
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/// If the node has a typed value, return the string representation of the value. If the node
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/// is not a parent type (comment, text, pi, etc.), get its simple text value. Otherwise,
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/// concatenate all text node descendants of the current node.
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/// </summary>
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public override string Value {
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get { return this.text; }
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}
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//-----------------------------------------------
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// XPathNavigator
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//-----------------------------------------------
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/// <summary>
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/// Get the base URI of the Rtf.
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/// </summary>
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public override string BaseURI {
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get { return this.baseUri; }
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}
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/// <summary>
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/// Create a copy of this navigator, positioned to the same node in the tree.
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/// </summary>
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public override XPathNavigator Clone() {
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return new RtfTextNavigator(this);
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}
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/// <summary>
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/// Position this navigator to the same position as the "other" navigator. If the "other" navigator
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/// is not of the same type as this navigator, then return false.
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/// </summary>
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public override bool MoveTo(XPathNavigator other) {
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RtfTextNavigator that = other as RtfTextNavigator;
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if (that != null) {
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this.text = that.text;
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this.baseUri = that.baseUri;
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this.constr = that.constr;
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return true;
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}
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return false;
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}
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}
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/// <summary>
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/// This class creates a document on the first call to GetNavigator(), and returns a Navigator from it. On
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/// subsequent calls, Navigators from the same document are returned (no new document is created).
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/// </summary>
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internal sealed class NavigatorConstructor {
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object cache;
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/// <summary>
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/// Create a document from the cache of events. If a document has already been created previously, return it.
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/// This method is thread-safe, and is always guaranteed to return the exact same document, no matter how many
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/// threads have called it concurrently.
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/// </summary>
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public XPathNavigator GetNavigator(XmlEventCache events, XmlNameTable nameTable) {
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if (this.cache == null) {
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// Create XPathDocument from event cache
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XPathDocument doc = new XPathDocument(nameTable);
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XmlRawWriter writer = doc.LoadFromWriter(XPathDocument.LoadFlags.AtomizeNames | (events.HasRootNode ? XPathDocument.LoadFlags.None : XPathDocument.LoadFlags.Fragment), events.BaseUri);
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events.EventsToWriter(writer);
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writer.Close();
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this.cache = doc;
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}
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return ((XPathDocument) this.cache).CreateNavigator();
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}
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/// <summary>
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/// Create a document containing a root node and a single text node child with "text" as its text value.
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/// This method is thread-safe, and is always guaranteed to return the exact same document, no matter how many
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/// threads have called it concurrently.
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/// </summary>
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public XPathNavigator GetNavigator(string text, string baseUri, XmlNameTable nameTable) {
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if (this.cache == null) {
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// Create XPathDocument
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XPathDocument doc = new XPathDocument(nameTable);
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XmlRawWriter writer = doc.LoadFromWriter(XPathDocument.LoadFlags.AtomizeNames, baseUri);
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writer.WriteString(text);
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writer.Close();
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this.cache = doc;
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}
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return ((XPathDocument) this.cache).CreateNavigator();
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}
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}
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}
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