source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Indentation/CSharp/DocumentAccessor.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
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.IO;

using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Indentation.CSharp
{
  /// <summary>
  /// Interface used for the indentation class to access the document.
  /// </summary>
  public interface IDocumentAccessor
  {
    /// <summary>Gets if the current line is read only (because it is not in the
    /// selected text region)</summary>
    bool IsReadOnly { get; }
    /// <summary>Gets the number of the current line.</summary>
    int LineNumber { get; }
    /// <summary>Gets/Sets the text of the current line.</summary>
    string Text { get; set; }
    /// <summary>Advances to the next line.</summary>
    bool MoveNext();
  }
  
  #region TextDocumentAccessor
  /// <summary>
  /// Adapter IDocumentAccessor -> TextDocument
  /// </summary>
  public sealed class TextDocumentAccessor : IDocumentAccessor
  {
    readonly TextDocument doc;
    readonly int minLine;
    readonly int maxLine;
    
    /// <summary>
    /// Creates a new TextDocumentAccessor.
    /// </summary>
    public TextDocumentAccessor(TextDocument document)
    {
      if (document == null)
        throw new ArgumentNullException("document");
      doc = document;
      this.minLine = 1;
      this.maxLine = doc.LineCount;
    }
    
    /// <summary>
    /// Creates a new TextDocumentAccessor that indents only a part of the document.
    /// </summary>
    public TextDocumentAccessor(TextDocument document, int minLine, int maxLine)
    {
      if (document == null)
        throw new ArgumentNullException("document");
      doc = document;
      this.minLine = minLine;
      this.maxLine = maxLine;
    }
    
    int num;
    string text;
    DocumentLine line;
    
    /// <inheritdoc/>
    public bool IsReadOnly {
      get {
        return num < minLine;
      }
    }
    
    /// <inheritdoc/>
    public int LineNumber {
      get {
        return num;
      }
    }
    
    bool lineDirty;
    
    /// <inheritdoc/>
    public string Text {
      get { return text; }
      set {
        if (num < minLine) return;
        text = value;
        lineDirty = true;
      }
    }
    
    /// <inheritdoc/>
    public bool MoveNext()
    {
      if (lineDirty) {
        doc.Replace(line, text);
        lineDirty = false;
      }
      ++num;
      if (num > maxLine) return false;
      line = doc.GetLineByNumber(num);
      text = doc.GetText(line);
      return true;
    }
  }
  #endregion
}