Add WriteTextTo() method to ITextSource.

ICSharpCode.NRefactory/Editor/ITextSource.cs

@@ -94,6 +94,16 @@ namespace ICSharpCode.NRefactory.Editor
 		/// <exception cref="ArgumentOutOfRangeException">offset or length is outside the valid range.</exception>
 		string GetText(ISegment segment);
 		
+		/// <summary>
+		/// Writes the text from this document into the TextWriter.
+		/// </summary>
+		void WriteTextTo(TextWriter writer);
+		
+		/// <summary>
+		/// Writes the text from this document into the TextWriter.
+		/// </summary>
+		void WriteTextTo(TextWriter writer, int offset, int length);
+		
 		/// <summary>
 		/// Gets the index of the first occurrence of the character in the specified array.
 		/// </summary>

ICSharpCode.NRefactory/Editor/ReadOnlyDocument.cs

@@ -359,6 +359,18 @@ namespace ICSharpCode.NRefactory.Editor
 			return textSource.CreateReader(offset, length);
 		}
 		
+		/// <inheritdoc/>
+		public void WriteTextTo(System.IO.TextWriter writer)
+		{
+			textSource.WriteTextTo(writer);
+		}
+		
+		/// <inheritdoc/>
+		public void WriteTextTo(System.IO.TextWriter writer, int offset, int length)
+		{
+			textSource.WriteTextTo(writer, offset, length);
+		}
+		
 		/// <inheritdoc/>
 		public char GetCharAt(int offset)
 		{

ICSharpCode.NRefactory/Editor/StringBuilderDocument.cs

@@ -41,11 +41,27 @@ namespace ICSharpCode.NRefactory.Editor
 			b = new StringBuilder();
 		}
 		
+		/// <summary>
+		/// Creates a new StringBuilderDocument with the specified initial text.
+		/// </summary>
 		public StringBuilderDocument(string text)
 		{
+			if (text == null)
+				throw new ArgumentNullException("text");
 			b = new StringBuilder(text);
 		}
 		
+		/// <summary>
+		/// Creates a new StringBuilderDocument with the initial text copied from the specified text source.
+		/// </summary>
+		public StringBuilderDocument(ITextSource textSource)
+		{
+			if (textSource == null)
+				throw new ArgumentNullException("textSource");
+			b = new StringBuilder(textSource.TextLength);
+			textSource.WriteTextTo(new StringWriter(b));
+		}
+		
 		/// <inheritdoc/>
 		public event EventHandler<TextChangeEventArgs> TextChanging;
 		
@@ -273,6 +289,22 @@ namespace ICSharpCode.NRefactory.Editor
 		{
 			return new StringReader(GetText(offset, length));
 		}
+		
+		/// <inheritdoc/>
+		public void WriteTextTo(TextWriter writer)
+		{
+			if (writer == null)
+				throw new ArgumentNullException("writer");
+			writer.Write(this.Text);
+		}
+		
+		/// <inheritdoc/>
+		public void WriteTextTo(TextWriter writer, int offset, int length)
+		{
+			if (writer == null)
+				throw new ArgumentNullException("writer");
+			writer.Write(GetText(offset, length));
+		}
 		#endregion
 		
 		#region GetText / IndexOf
@@ -310,6 +342,8 @@ namespace ICSharpCode.NRefactory.Editor
 		/// <inheritdoc/>
 		public string GetText(ISegment segment)
 		{
+			if (segment == null)
+				throw new ArgumentNullException("segment");
 			return b.ToString(segment.Offset, segment.Length);
 		}
 		

ICSharpCode.NRefactory/Editor/StringTextSource.cs

@@ -95,6 +95,18 @@ namespace ICSharpCode.NRefactory.Editor
 			return new StringReader(text.Substring(offset, length));
 		}
 		
+		/// <inheritdoc/>
+		public void WriteTextTo(TextWriter writer)
+		{
+			writer.Write(text);
+		}
+		
+		/// <inheritdoc/>
+		public void WriteTextTo(TextWriter writer, int offset, int length)
+		{
+			writer.Write(text.Substring(offset, length));
+		}
+		
 		/// <inheritdoc/>
 		public char GetCharAt(int offset)
 		{