source: stable/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Document/DocumentTextWriter.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.IO;
using System.Text;
#if NREFACTORY
using ICSharpCode.NRefactory.Editor;
#endif

namespace ICSharpCode.AvalonEdit.Document
{
  /// <summary>
  /// A TextWriter implementation that directly inserts into a document.
  /// </summary>
  public class DocumentTextWriter : TextWriter
  {
    readonly IDocument document;
    int insertionOffset;
    
    /// <summary>
    /// Creates a new DocumentTextWriter that inserts into document, starting at insertionOffset.
    /// </summary>
    public DocumentTextWriter(IDocument document, int insertionOffset)
    {
      this.insertionOffset = insertionOffset;
      if (document == null)
        throw new ArgumentNullException("document");
      this.document = document;
      var line = document.GetLineByOffset(insertionOffset);
      if (line.DelimiterLength == 0)
        line = line.PreviousLine;
      if (line != null)
        this.NewLine = document.GetText(line.EndOffset, line.DelimiterLength);
    }
    
    /// <summary>
    /// Gets/Sets the current insertion offset.
    /// </summary>
    public int InsertionOffset {
      get { return insertionOffset; }
      set { insertionOffset = value; }
    }
    
    /// <inheritdoc/>
    public override void Write(char value)
    {
      document.Insert(insertionOffset, value.ToString());
      insertionOffset++;
    }
    
    /// <inheritdoc/>
    public override void Write(char[] buffer, int index, int count)
    {
      document.Insert(insertionOffset, new string(buffer, index, count));
      insertionOffset += count;
    }
    
    /// <inheritdoc/>
    public override void Write(string value)
    {
      document.Insert(insertionOffset, value);
      insertionOffset += value.Length;
    }
    
    /// <inheritdoc/>
    public override Encoding Encoding {
      get { return Encoding.UTF8; }
    }
  }
}