source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Indentation/CSharp/CSharpIndentationStrategy.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 ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Indentation.CSharp
{
  /// <summary>
  /// Smart indentation for C#.
  /// </summary>
  public class CSharpIndentationStrategy : DefaultIndentationStrategy
  {
    /// <summary>
    /// Creates a new CSharpIndentationStrategy.
    /// </summary>
    public CSharpIndentationStrategy()
    {
    }
    
    /// <summary>
    /// Creates a new CSharpIndentationStrategy and initializes the settings using the text editor options.
    /// </summary>
    public CSharpIndentationStrategy(TextEditorOptions options)
    {
      this.IndentationString = options.IndentationString;
    }
    
    string indentationString = "\t";
    
    /// <summary>
    /// Gets/Sets the indentation string.
    /// </summary>
    public string IndentationString {
      get { return indentationString; }
      set {
        if (string.IsNullOrEmpty(value))
          throw new ArgumentException("Indentation string must not be null or empty");
        indentationString = value;
      }
    }
    
    /// <summary>
    /// Performs indentation using the specified document accessor.
    /// </summary>
    /// <param name="document">Object used for accessing the document line-by-line</param>
    /// <param name="keepEmptyLines">Specifies whether empty lines should be kept</param>
    public void Indent(IDocumentAccessor document, bool keepEmptyLines)
    {
      if (document == null)
        throw new ArgumentNullException("document");
      IndentationSettings settings = new IndentationSettings();
      settings.IndentString = this.IndentationString;
      settings.LeaveEmptyLines = keepEmptyLines;
      
      IndentationReformatter r = new IndentationReformatter();
      r.Reformat(document, settings);
    }
    
    /// <inheritdoc cref="IIndentationStrategy.IndentLine"/>
    public override void IndentLine(TextDocument document, DocumentLine line)
    {
      int lineNr = line.LineNumber;
      TextDocumentAccessor acc = new TextDocumentAccessor(document, lineNr, lineNr);
      Indent(acc, false);
      
      string t = acc.Text;
      if (t.Length == 0) {
        // use AutoIndentation for new lines in comments / verbatim strings.
        base.IndentLine(document, line);
      }
    }
    
    /// <inheritdoc cref="IIndentationStrategy.IndentLines"/>
    public override void IndentLines(TextDocument document, int beginLine, int endLine)
    {
      Indent(new TextDocumentAccessor(document, beginLine, endLine), true);
    }
  }
}