mcs/class/referencesource/System.Activities.Presentation/Microsoft.Tools.Common/Microsoft/Activities/Presentation/Xaml/XamlWriterExtensions.cs

   1 // <copyright>
   2 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // </copyright>
   4
   5 namespace Microsoft.Activities.Presentation.Xaml
   6 {
   7     using System.Xaml;
   8
   9     //
  10     internal static class XamlWriterExtensions
  11     {
  12         public static void PropagateLineInfo(XamlWriter targetWriter, IXamlLineInfo lineInfo)
  13         {
  14             if (lineInfo != null)
  15             {
  16                 IXamlLineInfoConsumer consumer = targetWriter as IXamlLineInfoConsumer;
  17                 SharedFx.Assert(consumer != null && consumer.ShouldProvideLineInfo, "Should only call this function to write into a XamlNodeQueue.Writer, which is always IXamlLineInfoConsumer");
  18                 consumer.SetLineInfo(lineInfo.LineNumber, lineInfo.LinePosition);
  19             }
  20         }
  21
  22         public static void PropagateLineInfo(XamlWriter targetWriter, int lineNumber, int linePosition)
  23         {
  24             IXamlLineInfoConsumer consumer = targetWriter as IXamlLineInfoConsumer;
  25             SharedFx.Assert(consumer != null && consumer.ShouldProvideLineInfo, "Should only call this function to write into a XamlNodeQueue.Writer, which is always IXamlLineInfoConsumer");
  26             consumer.SetLineInfo(lineNumber, linePosition);
  27         }
  28
  29         // This method is a workaround for TFS bug #788190, since XamlReader.ReadSubtree() should (but doesn't) preserve IXamlLineInfo on the subreader
  30         public static void Transform(XamlReader reader, XamlWriter writer, IXamlLineInfo readerLineInfo, bool closeWriter)
  31         {
  32             IXamlLineInfoConsumer consumer = writer as IXamlLineInfoConsumer;
  33             SharedFx.Assert(consumer != null && consumer.ShouldProvideLineInfo, "Should only call this function to write into a XamlNodeQueue.Writer, which is always IXamlLineInfoConsumer");
  34             bool shouldPassLineNumberInfo = false;
  35             if (readerLineInfo != null)
  36             {
  37                 shouldPassLineNumberInfo = true;
  38             }
  39
  40             while (reader.Read())
  41             {
  42                 if (shouldPassLineNumberInfo)
  43                 {
  44                     consumer.SetLineInfo(readerLineInfo.LineNumber, readerLineInfo.LinePosition);
  45                 }
  46
  47                 writer.WriteNode(reader);
  48             }
  49
  50             if (closeWriter)
  51             {
  52                 writer.Close();
  53             }
  54         }
  55
  56         public static void WriteNode(this XamlWriter writer, XamlReader reader, IXamlLineInfo lineInfo)
  57         {
  58             PropagateLineInfo(writer, lineInfo);
  59             writer.WriteNode(reader);
  60         }
  61
  62         public static void WriteEndMember(this XamlWriter writer, IXamlLineInfo lineInfo)
  63         {
  64             PropagateLineInfo(writer, lineInfo);
  65             writer.WriteEndMember();
  66         }
  67
  68         public static void WriteEndObject(this XamlWriter writer, IXamlLineInfo lineInfo)
  69         {
  70             PropagateLineInfo(writer, lineInfo);
  71             writer.WriteEndObject();
  72         }
  73
  74         public static void WriteGetObject(this XamlWriter writer, IXamlLineInfo lineInfo)
  75         {
  76             PropagateLineInfo(writer, lineInfo);
  77             writer.WriteGetObject();
  78         }
  79
  80         public static void WriteNamespace(this XamlWriter writer, NamespaceDeclaration namespaceDeclaration, IXamlLineInfo lineInfo)
  81         {
  82             PropagateLineInfo(writer, lineInfo);
  83             writer.WriteNamespace(namespaceDeclaration);
  84         }
  85
  86         public static void WriteStartMember(this XamlWriter writer, XamlMember xamlMember, IXamlLineInfo lineInfo)
  87         {
  88             PropagateLineInfo(writer, lineInfo);
  89             writer.WriteStartMember(xamlMember);
  90         }
  91
  92         public static void WriteStartMember(this XamlWriter writer, XamlMember xamlMember, int lineNumber, int linePosition)
  93         {
  94             PropagateLineInfo(writer, lineNumber, linePosition);
  95             writer.WriteStartMember(xamlMember);
  96         }
  97
  98         public static void WriteStartObject(this XamlWriter writer, XamlType type, IXamlLineInfo lineInfo)
  99         {
 100             PropagateLineInfo(writer, lineInfo);
 101             writer.WriteStartObject(type);
 102         }
 103
 104         public static void WriteValue(this XamlWriter writer, object value, IXamlLineInfo lineInfo)
 105         {
 106             PropagateLineInfo(writer, lineInfo);
 107             writer.WriteValue(value);
 108         }
 109     }
 110 }