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//------------------------------------------------------------------------------
// <copyright file="WhitespaceRuleReader.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using System.Diagnostics;
using MS.Internal.Xml;
namespace System.Xml.Xsl.Runtime {
/// <summary>
/// </summary>
internal class WhitespaceRuleReader : XmlWrappingReader {
private WhitespaceRuleLookup wsRules;
private BitStack stkStrip;
private bool shouldStrip, preserveAdjacent;
private string val;
private XmlCharType xmlCharType = XmlCharType.Instance;
static public XmlReader CreateReader(XmlReader baseReader, WhitespaceRuleLookup wsRules) {
if (wsRules == null) {
return baseReader; // There is no rules to process
}
XmlReaderSettings readerSettings = baseReader.Settings;
if (readerSettings != null) {
if (readerSettings.IgnoreWhitespace) {
return baseReader; // V2 XmlReader that strips all WS
}
} else {
XmlTextReader txtReader = baseReader as XmlTextReader;
if (txtReader != null && txtReader.WhitespaceHandling == WhitespaceHandling.None) {
return baseReader; // V1 XmlTextReader that strips all WS
}
XmlTextReaderImpl txtReaderImpl = baseReader as XmlTextReaderImpl;
if (txtReaderImpl != null && txtReaderImpl.WhitespaceHandling == WhitespaceHandling.None) {
return baseReader; // XmlTextReaderImpl that strips all WS
}
}
return new WhitespaceRuleReader(baseReader, wsRules);
}
private WhitespaceRuleReader(XmlReader baseReader, WhitespaceRuleLookup wsRules) : base(baseReader) {
Debug.Assert(wsRules != null);
this.val = null;
this.stkStrip = new BitStack();
this.shouldStrip = false;
this.preserveAdjacent = false;
this.wsRules = wsRules;
this.wsRules.Atomize(baseReader.NameTable);
}
/// <summary>
/// Override Value in order to possibly prepend extra whitespace.
/// </summary>
public override string Value {
get { return (this.val == null) ? base.Value : this.val; }
}
/// <summary>
/// Override Read in order to search for strippable whitespace, to concatenate adjacent text nodes, and to
/// resolve entities.
/// </summary>
public override bool Read() {
XmlCharType xmlCharType = XmlCharType.Instance;
string ws = null;
// Clear text value
this.val = null;
while (base.Read()) {
switch (base.NodeType) {
case XmlNodeType.Element:
// Push boolean indicating whether whitespace children of this element should be stripped
if (!base.IsEmptyElement) {
this.stkStrip.PushBit(this.shouldStrip);
// Strip if rules say we should and we're not within the scope of xml:space="preserve"
this.shouldStrip = wsRules.ShouldStripSpace(base.LocalName, base.NamespaceURI) && (base.XmlSpace != XmlSpace.Preserve);
}
break;
case XmlNodeType.EndElement:
// Restore parent shouldStrip setting
this.shouldStrip = this.stkStrip.PopBit();
break;
case XmlNodeType.Text:
case XmlNodeType.CDATA:
// If preserving adjacent text, don't perform any further checks
if (this.preserveAdjacent)
return true;
if (this.shouldStrip) {
// Reader may report whitespace as Text or CDATA
if (xmlCharType.IsOnlyWhitespace(base.Value))
goto case XmlNodeType.Whitespace;
// If whitespace was cached, then prepend it to text or CDATA value
if (ws != null)
this.val = string.Concat(ws, base.Value);
// Preserve adjacent whitespace
this.preserveAdjacent = true;
return true;
}
break;
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
// If preserving adjacent text, don't perform any further checks
if (this.preserveAdjacent)
return true;
if (this.shouldStrip) {
// Save whitespace until it can be determined whether it will be stripped
if (ws == null)
ws = base.Value;
else
ws = string.Concat(ws, base.Value);
// Read next event
continue;
}
break;
case XmlNodeType.EndEntity:
// Read next event
continue;
}
// No longer preserve adjacent space
this.preserveAdjacent = false;
return true;
}
return false;
}
}
}
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