1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
//------------------------------------------------------------------------------
// <copyright file="XmlEntityReference.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
// <code>EntityReference</code> objects may be inserted into the structure
// model when an entity reference is in the source document, or when the user
// wishes to insert an entity reference. Note that character references and
// references to predefined entities are considered to be expanded by the
// HTML or XML processor so that characters are represented by their Unicode
// equivalent rather than by an entity reference. Moreover, the XML
// processor may completely expand references to entities while building the
// structure model, instead of providing <code>EntityReference</code>
// objects. If it does provide such objects, then for a given
// <code>EntityReference</code> node, it may be that there is no
// <code>Entity</code> node representing the referenced entity; but if such
// an <code>Entity</code> exists, then the child list of the
// <code>EntityReference</code> node is the same as that of the
// <code>Entity</code> node. As with the <code>Entity</code> node, all
// descendants of the <code>EntityReference</code> are readonly.
// <p>The resolution of the children of the <code>EntityReference</code> (the
// replacement value of the referenced <code>Entity</code>) may be lazily
// evaluated; actions by the user (such as calling the
// <code>childNodes</code> method on the <code>EntityReference</code> node)
// are assumed to trigger the evaluation.
namespace System.Xml {
using System.Diagnostics;
// Represents an entity reference node.
public class XmlEntityReference : XmlLinkedNode {
string name;
XmlLinkedNode lastChild;
protected internal XmlEntityReference( string name, XmlDocument doc ) : base( doc ) {
if ( !doc.IsLoading ) {
if ( name.Length > 0 && name[0] == '#' ) {
throw new ArgumentException( Res.GetString( Res.Xdom_InvalidCharacter_EntityReference ) );
}
}
this.name = doc.NameTable.Add(name);
doc.fEntRefNodesPresent = true;
}
// Gets the name of the node.
public override string Name {
get { return name;}
}
// Gets the name of the node without the namespace prefix.
public override string LocalName {
get { return name;}
}
// Gets or sets the value of the node.
public override String Value {
get {
return null;
}
set {
throw new InvalidOperationException(Res.GetString(Res.Xdom_EntRef_SetVal));
}
}
// Gets the type of the node.
public override XmlNodeType NodeType {
get { return XmlNodeType.EntityReference;}
}
// Creates a duplicate of this node.
public override XmlNode CloneNode(bool deep) {
Debug.Assert( OwnerDocument != null );
XmlEntityReference eref = OwnerDocument.CreateEntityReference( name );
return eref;
}
//
// Microsoft extensions
//
// Gets a value indicating whether the node is read-only.
public override bool IsReadOnly {
get {
return true; // Make entity references readonly
}
}
internal override bool IsContainer {
get { return true;}
}
internal override void SetParent( XmlNode node ) {
base.SetParent(node);
if ( LastNode == null && node != null && node != OwnerDocument ) {
//first time insert the entity reference into the tree, we should expand its children now
XmlLoader loader = new XmlLoader();
loader.ExpandEntityReference(this);
}
}
internal override void SetParentForLoad( XmlNode node ) {
this.SetParent( node );
}
internal override XmlLinkedNode LastNode {
get {
return lastChild;
}
set { lastChild = value;}
}
internal override bool IsValidChildType( XmlNodeType type ) {
switch (type) {
case XmlNodeType.Element:
case XmlNodeType.Text:
case XmlNodeType.EntityReference:
case XmlNodeType.Comment:
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
case XmlNodeType.ProcessingInstruction:
case XmlNodeType.CDATA:
return true;
default:
return false;
}
}
// Saves the node to the specified XmlWriter.
public override void WriteTo(XmlWriter w) {
w.WriteEntityRef(name);
}
// Saves all the children of the node to the specified XmlWriter.
public override void WriteContentTo(XmlWriter w) {
// -- eventually will the fix. commented out waiting for finalizing on the issue.
foreach( XmlNode n in this ) {
n.WriteTo( w );
} //still use the old code to generate the output
/*
foreach( XmlNode n in this ) {
if ( n.NodeType != XmlNodeType.EntityReference )
n.WriteTo( w );
else
n.WriteContentTo( w );
}*/
}
public override String BaseURI {
get {
return OwnerDocument.BaseURI;
}
}
private string ConstructBaseURI( string baseURI, string systemId ) {
if ( baseURI == null )
return systemId;
int nCount = baseURI.LastIndexOf('/')+1;
string buf = baseURI;
if ( nCount > 0 && nCount < baseURI.Length )
buf = baseURI.Substring(0, nCount);
else if ( nCount == 0 )
buf = buf + "\\";
return (buf + systemId.Replace('\\', '/'));
}
//childrenBaseURI returns where the entity reference node's children come from
internal String ChildBaseURI {
get {
//get the associate entity and return its baseUri
XmlEntity ent = OwnerDocument.GetEntityNode( name );
if ( ent != null ) {
if ( ent.SystemId != null && ent.SystemId.Length > 0 )
return ConstructBaseURI(ent.BaseURI, ent.SystemId);
else
return ent.BaseURI;
}
return String.Empty;
}
}
}
}
|
