summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Xaml/XamlNode.cs
blob: a19e7d5cbed4540503b000513b8f71740ec24280 (plain)
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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Xml;
using Xamarin.Forms.Internals;

namespace Xamarin.Forms.Xaml
{
	internal interface INode
	{
		List<string> IgnorablePrefixes { get; set; }

		IXmlNamespaceResolver NamespaceResolver { get; }

		INode Parent { get; set; }

		void Accept(IXamlNodeVisitor visitor, INode parentNode);
		INode Clone();
	}

	internal interface IValueNode : INode
	{
	}

	internal interface IElementNode : INode, IListNode
	{
		Dictionary<XmlName, INode> Properties { get; }

		List<XmlName> SkipProperties { get; }

		INameScope Namescope { get; }

		XmlType XmlType { get; }

		string NamespaceURI { get; }
	}

	internal interface IListNode : INode
	{
		List<INode> CollectionItems { get; }
	}

	[DebuggerDisplay("{NamespaceUri}:{Name}")]
	internal class XmlType
	{
		public XmlType(string namespaceUri, string name, IList<XmlType> typeArguments)
		{
			NamespaceUri = namespaceUri;
			Name = name;
			TypeArguments = typeArguments;
		}

		public string NamespaceUri { get; }
		public string Name { get; }
		public IList<XmlType> TypeArguments { get; private set; }

	}

	internal abstract class BaseNode : IXmlLineInfo, INode
	{
		protected BaseNode(IXmlNamespaceResolver namespaceResolver, int linenumber = -1, int lineposition = -1)
		{
			NamespaceResolver = namespaceResolver;
			LineNumber = linenumber;
			LinePosition = lineposition;
		}

		public IXmlNamespaceResolver NamespaceResolver { get; }

		public abstract void Accept(IXamlNodeVisitor visitor, INode parentNode);

		public INode Parent { get; set; }

		public List<string> IgnorablePrefixes { get; set; }

		public bool HasLineInfo()
		{
			return LineNumber >= 0 && LinePosition >= 0;
		}

		public int LineNumber { get; set; }

		public int LinePosition { get; set; }

		public abstract INode Clone();
	}

	[DebuggerDisplay("{Value}")]
	internal class ValueNode : BaseNode, IValueNode
	{
		public ValueNode(object value, IXmlNamespaceResolver namespaceResolver, int linenumber = -1, int lineposition = -1)
			: base(namespaceResolver, linenumber, lineposition)
		{
			Value = value;
		}

		public object Value { get; set; }

		public override void Accept(IXamlNodeVisitor visitor, INode parentNode)
		{
			visitor.Visit(this, parentNode);
		}

		public override INode Clone()
		{
			return new ValueNode(Value, NamespaceResolver, LineNumber, LinePosition) {
				IgnorablePrefixes = IgnorablePrefixes
			};
		}
	}

	[DebuggerDisplay("{MarkupString}")]
	internal class MarkupNode : BaseNode, IValueNode
	{
		public MarkupNode(string markupString, IXmlNamespaceResolver namespaceResolver, int linenumber = -1,
			int lineposition = -1)
			: base(namespaceResolver, linenumber, lineposition)
		{
			MarkupString = markupString;
		}

		public string MarkupString { get; }

		public override void Accept(IXamlNodeVisitor visitor, INode parentNode)
		{
			visitor.Visit(this, parentNode);
		}

		public override INode Clone()
		{
			return new MarkupNode(MarkupString, NamespaceResolver, LineNumber, LinePosition) {
				IgnorablePrefixes = IgnorablePrefixes
			};
		}
	}

	internal class ElementNode : BaseNode, IValueNode, IElementNode
	{
		public ElementNode(XmlType type, string namespaceURI, IXmlNamespaceResolver namespaceResolver, int linenumber = -1,
			int lineposition = -1)
			: base(namespaceResolver, linenumber, lineposition)
		{
			Properties = new Dictionary<XmlName, INode>();
			SkipProperties = new List<XmlName>();
			CollectionItems = new List<INode>();
			XmlType = type;
			NamespaceURI = namespaceURI;
		}

		public Dictionary<XmlName, INode> Properties { get; }

		public List<XmlName> SkipProperties { get; }

		public List<INode> CollectionItems { get; }

		public XmlType XmlType { get; }

		public string NamespaceURI { get; }

		public INameScope Namescope { get; set; }

		public override void Accept(IXamlNodeVisitor visitor, INode parentNode)
		{
			if (!visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
			if ((!visitor.StopOnDataTemplate || !IsDataTemplate(this, parentNode)) &&
			    (!visitor.StopOnResourceDictionary || !IsResourceDictionary(this, parentNode)))
			{
				foreach (var node in Properties.Values.ToList())
					node.Accept(visitor, this);
				foreach (var node in CollectionItems)
					node.Accept(visitor, this);
			}
			if (visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
		}

		internal static bool IsDataTemplate(INode node, INode parentNode)
		{
			var parentElement = parentNode as IElementNode;
			INode createContent;
			if (parentElement != null && parentElement.Properties.TryGetValue(XmlName._CreateContent, out createContent) &&
			    createContent == node)
				return true;
			return false;
		}

		internal static bool IsResourceDictionary(INode node, INode parentNode)
		{
			var enode = node as ElementNode;
			return enode.XmlType.Name == "ResourceDictionary";
		}

		public override INode Clone()
		{
			var clone = new ElementNode(XmlType, NamespaceURI, NamespaceResolver, LineNumber, LinePosition) {
				IgnorablePrefixes = IgnorablePrefixes
			};
			foreach (var kvp in Properties)
				clone.Properties.Add(kvp.Key, kvp.Value.Clone());
			foreach (var p in SkipProperties)
				clone.SkipProperties.Add(p);
			foreach (var p in CollectionItems)
				clone.CollectionItems.Add(p.Clone());
			return clone;
		}
	}

	internal abstract class RootNode : ElementNode
	{
		protected RootNode(XmlType xmlType, IXmlNamespaceResolver nsResolver) : base(xmlType, xmlType.NamespaceUri, nsResolver)
		{
		}

		public override void Accept(IXamlNodeVisitor visitor, INode parentNode)
		{
			if (!visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
			if ((!visitor.StopOnDataTemplate || !IsDataTemplate(this, parentNode)) &&
				(!visitor.StopOnResourceDictionary || !IsResourceDictionary(this, parentNode)))
			{
				foreach (var node in Properties.Values.ToList())
					node.Accept(visitor, this);
				foreach (var node in CollectionItems)
					node.Accept(visitor, this);
			}
			if (visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
		}
	}

	internal class ListNode : BaseNode, IListNode, IValueNode
	{
		public ListNode(IList<INode> nodes, IXmlNamespaceResolver namespaceResolver, int linenumber = -1,
			int lineposition = -1) : base(namespaceResolver, linenumber, lineposition)
		{
			CollectionItems = nodes.ToList();
		}

		public XmlName XmlName { get; set; }

		public List<INode> CollectionItems { get; set; }

		public override void Accept(IXamlNodeVisitor visitor, INode parentNode)
		{
			if (!visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
			foreach (var node in CollectionItems)
				node.Accept(visitor, this);
			if (visitor.VisitChildrenFirst)
				visitor.Visit(this, parentNode);
		}

		public override INode Clone()
		{
			var items = new List<INode>();
			foreach (var p in CollectionItems)
				items.Add(p.Clone());
			return new ListNode(items, NamespaceResolver, LineNumber, LinePosition) {
				IgnorablePrefixes = IgnorablePrefixes
			};
		}
	}

	internal static class INodeExtensions
	{
		public static bool SkipPrefix(this INode node, string prefix)
		{
			do
			{
				if (node.IgnorablePrefixes != null && node.IgnorablePrefixes.Contains(prefix))
					return true;
				node = node.Parent;
			} while (node != null);
			return false;
		}
	}
}