source: trunk/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/Editor/StringTextSource.cs @ 17197

// Copyright (c) 2010-2013 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;

namespace ICSharpCode.NRefactory.Editor
{
  /// <summary>
  /// Implements the ITextSource interface using a string.
  /// </summary>
  [Serializable]
  public class StringTextSource : ITextSource
  {
    /// <summary>
    /// Gets a text source containing the empty string.
    /// </summary>
    public static readonly StringTextSource Empty = new StringTextSource(string.Empty);
    
    readonly string text;
    readonly ITextSourceVersion version;
    
    /// <summary>
    /// Creates a new StringTextSource with the given text.
    /// </summary>
    public StringTextSource(string text)
    {
      if (text == null)
        throw new ArgumentNullException("text");
      this.text = text;
    }
    
    /// <summary>
    /// Creates a new StringTextSource with the given text.
    /// </summary>
    public StringTextSource(string text, ITextSourceVersion version)
    {
      if (text == null)
        throw new ArgumentNullException("text");
      this.text = text;
      this.version = version;
    }
    
    /// <inheritdoc/>
    public ITextSourceVersion Version {
      get { return version; }
    }
    
    /// <inheritdoc/>
    public int TextLength {
      get { return text.Length; }
    }
    
    /// <inheritdoc/>
    public string Text {
      get { return text; }
    }
    
    /// <inheritdoc/>
    public ITextSource CreateSnapshot()
    {
      return this; // StringTextSource is immutable
    }
    
    /// <inheritdoc/>
    public ITextSource CreateSnapshot(int offset, int length)
    {
      return new StringTextSource(text.Substring(offset, length));
    }
    
    /// <inheritdoc/>
    public TextReader CreateReader()
    {
      return new StringReader(text);
    }
    
    /// <inheritdoc/>
    public TextReader CreateReader(int offset, int length)
    {
      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)
    {
      return text[offset];
    }
    
    /// <inheritdoc/>
    public string GetText(int offset, int length)
    {
      return text.Substring(offset, length);
    }
    
    /// <inheritdoc/>
    public string GetText(ISegment segment)
    {
      if (segment == null)
        throw new ArgumentNullException("segment");
      return text.Substring(segment.Offset, segment.Length);
    }
    
    /// <inheritdoc/>
    public int IndexOf(char c, int startIndex, int count)
    {
      return text.IndexOf(c, startIndex, count);
    }
    
    /// <inheritdoc/>
    public int IndexOfAny(char[] anyOf, int startIndex, int count)
    {
      return text.IndexOfAny(anyOf, startIndex, count);
    }
    
    /// <inheritdoc/>
    public int IndexOf(string searchText, int startIndex, int count, StringComparison comparisonType)
    {
      return text.IndexOf(searchText, startIndex, count, comparisonType);
    }
    
    /// <inheritdoc/>
    public int LastIndexOf(char c, int startIndex, int count)
    {
      return text.LastIndexOf(c, startIndex + count - 1, count);
    }
    
    /// <inheritdoc/>
    public int LastIndexOf(string searchText, int startIndex, int count, StringComparison comparisonType)
    {
      return text.LastIndexOf(searchText, startIndex + count - 1, count, comparisonType);
    }
  }
}