Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/XamlWrappingReader.cs

@@ -0,0 +1,91 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Text;
+    using System.Xaml;
+    using XamlBuildTask;
+
+    internal class XamlWrappingReader : XamlReader, IXamlLineInfo
+    {
+        XamlReader _underlyingReader;
+
+        internal XamlWrappingReader(XamlReader underlyingReader)
+        {
+            if (underlyingReader == null)
+            {
+                throw FxTrace.Exception.AsError(new ArgumentNullException("underlyingReader"));
+            }
+            _underlyingReader = underlyingReader;
+        }
+
+        public override bool IsEof
+        {
+            get { return _underlyingReader.IsEof; }
+        }
+
+        public override XamlMember Member
+        {
+            get { return _underlyingReader.Member; }
+        }
+
+        public override NamespaceDeclaration Namespace
+        {
+            get { return _underlyingReader.Namespace; }
+        }
+
+        public override XamlNodeType NodeType
+        {
+            get { return _underlyingReader.NodeType; }
+        }
+
+        public override bool Read()
+        {
+            return _underlyingReader.Read();
+        }
+
+        public override XamlSchemaContext SchemaContext
+        {
+            get { return _underlyingReader.SchemaContext; }
+        }
+
+        public override XamlType Type
+        {
+            get { return _underlyingReader.Type; }
+        }
+
+        public override object Value
+        {
+            get { return _underlyingReader.Value; }
+        }
+
+        private IXamlLineInfo LineInfo
+        {
+            get { return _underlyingReader as IXamlLineInfo; }
+        }
+
+        #region IXamlLineInfo Members
+
+        public bool HasLineInfo
+        {
+            get { return LineInfo != null && LineInfo.HasLineInfo; }
+        }
+
+        public int LineNumber
+        {
+            get { return LineInfo == null ? 0 : LineInfo.LineNumber; }
+        }
+
+        public int LinePosition
+        {
+            get { return LineInfo == null ? 0 : LineInfo.LinePosition; }
+        }
+
+        #endregion
+    }
+}