source: trunk/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/Editor/ReadOnlyDocument.cs @ 16752

// 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.Collections.Generic;

namespace ICSharpCode.NRefactory.Editor
{
  /// <summary>
  /// Read-only implementation of <see cref="IDocument"/>.
  /// </summary>
  [Serializable]
  public sealed class ReadOnlyDocument : IDocument
  {
    readonly ITextSource textSource;
    readonly string fileName;
    int[] lines;
    
    static readonly char[] newline = { '\r', '\n' };
    
    /// <summary>
    /// Creates a new ReadOnlyDocument from the given text source.
    /// </summary>
    public ReadOnlyDocument(ITextSource textSource)
    {
      if (textSource == null)
        throw new ArgumentNullException("textSource");
      // ensure that underlying buffer is immutable
      this.textSource = textSource.CreateSnapshot();
      List<int> lines = new List<int>();
      lines.Add(0);
      int offset = 0;
      int textLength = textSource.TextLength;
      while ((offset = textSource.IndexOfAny(newline, offset, textLength - offset)) >= 0) {
        offset++;
        if (textSource.GetCharAt(offset - 1) == '\r' && offset < textLength && textSource.GetCharAt(offset) == '\n') {
          offset++;
        }
        lines.Add(offset);
      }
      this.lines = lines.ToArray();
    }
    
    /// <summary>
    /// Creates a new ReadOnlyDocument from the given string.
    /// </summary>
    public ReadOnlyDocument(string text)
      : this(new StringTextSource(text))
    {
    }
    
    /// <summary>
    /// Creates a new ReadOnlyDocument from the given text source;
    /// and sets IDocument.FileName to the specified file name.
    /// </summary>
    public ReadOnlyDocument(ITextSource textSource, string fileName)
      : this(textSource)
    {
      this.fileName = fileName;
    }
    
    /// <inheritdoc/>
    public IDocumentLine GetLineByNumber(int lineNumber)
    {
      if (lineNumber < 1 || lineNumber > lines.Length)
        throw new ArgumentOutOfRangeException("lineNumber", lineNumber, "Value must be between 1 and " + lines.Length);
      return new ReadOnlyDocumentLine(this, lineNumber);
    }
    
    sealed class ReadOnlyDocumentLine : IDocumentLine
    {
      readonly ReadOnlyDocument doc;
      readonly int lineNumber;
      readonly int offset, endOffset;
      
      public ReadOnlyDocumentLine(ReadOnlyDocument doc, int lineNumber)
      {
        this.doc = doc;
        this.lineNumber = lineNumber;
        this.offset = doc.GetStartOffset(lineNumber);
        this.endOffset = doc.GetEndOffset(lineNumber);
      }
      
      public override int GetHashCode()
      {
        return doc.GetHashCode() ^ lineNumber;
      }
      
      public override bool Equals(object obj)
      {
        ReadOnlyDocumentLine other = obj as ReadOnlyDocumentLine;
        return other != null && doc == other.doc && lineNumber == other.lineNumber;
      }
      
      public int Offset {
        get { return offset; }
      }
      
      public int Length {
        get { return endOffset - offset; }
      }
      
      public int EndOffset {
        get { return endOffset; }
      }
      
      public int TotalLength {
        get {
          return doc.GetTotalEndOffset(lineNumber) - offset;
        }
      }
      
      public int DelimiterLength {
        get {
          return doc.GetTotalEndOffset(lineNumber) - endOffset;
        }
      }
      
      public int LineNumber {
        get { return lineNumber; }
      }
      
      public IDocumentLine PreviousLine {
        get {
          if (lineNumber == 1)
            return null;
          else
            return new ReadOnlyDocumentLine(doc, lineNumber - 1);
        }
      }
      
      public IDocumentLine NextLine {
        get {
          if (lineNumber == doc.LineCount)
            return null;
          else
            return new ReadOnlyDocumentLine(doc, lineNumber + 1);
        }
      }
      
      public bool IsDeleted {
        get { return false; }
      }
    }
    
    int GetStartOffset(int lineNumber)
    {
      return lines[lineNumber-1];
    }
    
    int GetTotalEndOffset(int lineNumber)
    {
      return lineNumber < lines.Length ? lines[lineNumber] : textSource.TextLength;
    }
    
    int GetEndOffset(int lineNumber)
    {
      if (lineNumber == lines.Length)
        return textSource.TextLength;
      int off = lines[lineNumber] - 1;
      if (off > 0 && textSource.GetCharAt(off - 1) == '\r' && textSource.GetCharAt(off) == '\n')
        off--;
      return off;
    }
    
    /// <inheritdoc/>
    public IDocumentLine GetLineByOffset(int offset)
    {
      return GetLineByNumber(GetLineNumberForOffset(offset));
    }
    
    int GetLineNumberForOffset(int offset)
    {
      int r = Array.BinarySearch(lines, offset);
      return r < 0 ? ~r : r + 1;
    }
    
    /// <inheritdoc/>
    public int GetOffset(int line, int column)
    {
      if (line < 1 || line > lines.Length)
        throw new ArgumentOutOfRangeException("line", line, "Value must be between 1 and " + lines.Length);
      int lineStart = GetStartOffset(line);
      if (column <= 1)
        return lineStart;
      int lineEnd = GetEndOffset(line);
      if (column - 1 >= lineEnd - lineStart)
        return lineEnd;
      return lineStart + column - 1;
    }
    
    /// <inheritdoc/>
    public int GetOffset(TextLocation location)
    {
      return GetOffset(location.Line, location.Column);
    }
    
    /// <inheritdoc/>
    public TextLocation GetLocation(int offset)
    {
      if (offset < 0 || offset > textSource.TextLength)
        throw new ArgumentOutOfRangeException("offset", offset, "Value must be between 0 and " + textSource.TextLength);
      int line = GetLineNumberForOffset(offset);
      return new TextLocation(line, offset-GetStartOffset(line)+1);
    }
    
    /// <inheritdoc/>
    public string Text {
      get { return textSource.Text; }
      set {
        throw new NotSupportedException();
      }
    }
    
    /// <inheritdoc/>
    public int LineCount {
      get { return lines.Length; }
    }
    
    /// <inheritdoc/>
    public ITextSourceVersion Version {
      get { return textSource.Version; }
    }
    
    /// <inheritdoc/>
    public int TextLength {
      get { return textSource.TextLength; }
    }
    
    event EventHandler<TextChangeEventArgs> IDocument.TextChanging { add {} remove {} }
    
    event EventHandler<TextChangeEventArgs> IDocument.TextChanged { add {} remove {} }
    
    event EventHandler IDocument.ChangeCompleted { add {} remove {} }
    
    void IDocument.Insert(int offset, string text)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Insert(int offset, string text, AnchorMovementType defaultAnchorMovementType)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Remove(int offset, int length)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Replace(int offset, int length, string newText)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Insert(int offset, ITextSource text)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Insert(int offset, ITextSource text, AnchorMovementType defaultAnchorMovementType)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.Replace(int offset, int length, ITextSource newText)
    {
      throw new NotSupportedException();
    }
    
    void IDocument.StartUndoableAction()
    {
    }
    
    void IDocument.EndUndoableAction()
    {
    }
    
    IDisposable IDocument.OpenUndoGroup()
    {
      return null;
    }
    
    /// <inheritdoc/>
    public ITextAnchor CreateAnchor(int offset)
    {
      return new ReadOnlyDocumentTextAnchor(GetLocation(offset), offset);
    }
    
    sealed class ReadOnlyDocumentTextAnchor : ITextAnchor
    {
      readonly TextLocation location;
      readonly int offset;
      
      public ReadOnlyDocumentTextAnchor(TextLocation location, int offset)
      {
        this.location = location;
        this.offset = offset;
      }
      
      public event EventHandler Deleted { add {} remove {} }
      
      public TextLocation Location {
        get { return location; }
      }
      
      public int Offset {
        get { return offset; }
      }
      
      public AnchorMovementType MovementType { get; set; }
      
      public bool SurviveDeletion { get; set; }
      
      public bool IsDeleted {
        get { return false; }
      }
      
      public int Line {
        get { return location.Line; }
      }
      
      public int Column {
        get { return location.Column; }
      }
    }
    
    /// <inheritdoc/>
    public ITextSource CreateSnapshot()
    {
      return textSource; // textBuffer is immutable
    }
    
    /// <inheritdoc/>
    public ITextSource CreateSnapshot(int offset, int length)
    {
      return textSource.CreateSnapshot(offset, length);
    }
    
    /// <inheritdoc/>
    public IDocument CreateDocumentSnapshot()
    {
      return this; // ReadOnlyDocument is immutable
    }
    
    /// <inheritdoc/>
    public System.IO.TextReader CreateReader()
    {
      return textSource.CreateReader();
    }
    
    /// <inheritdoc/>
    public System.IO.TextReader CreateReader(int offset, int length)
    {
      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)
    {
      return textSource.GetCharAt(offset);
    }
    
    /// <inheritdoc/>
    public string GetText(int offset, int length)
    {
      return textSource.GetText(offset, length);
    }
    
    /// <inheritdoc/>
    public string GetText(ISegment segment)
    {
      return textSource.GetText(segment);
    }
    
    /// <inheritdoc/>
    public int IndexOf(char c, int startIndex, int count)
    {
      return textSource.IndexOf(c, startIndex, count);
    }
    
    /// <inheritdoc/>
    public int IndexOfAny(char[] anyOf, int startIndex, int count)
    {
      return textSource.IndexOfAny(anyOf, startIndex, count);
    }
    
    /// <inheritdoc/>
    public int IndexOf(string searchText, int startIndex, int count, StringComparison comparisonType)
    {
      return textSource.IndexOf(searchText, startIndex, count, comparisonType);
    }
    
    /// <inheritdoc/>
    public int LastIndexOf(char c, int startIndex, int count)
    {
      return textSource.LastIndexOf(c, startIndex, count);
    }
    
    /// <inheritdoc/>
    public int LastIndexOf(string searchText, int startIndex, int count, StringComparison comparisonType)
    {
      return textSource.LastIndexOf(searchText, startIndex, count, comparisonType);
    }
    
    object IServiceProvider.GetService(Type serviceType)
    {
      return null;
    }
    
    /// <inheritdoc/>
    /// <remarks>Will never be raised on <see cref="ReadOnlyDocument" />.</remarks>
    public event EventHandler FileNameChanged { add {} remove {} }
    
    /// <inheritdoc/>
    public string FileName {
      get { return fileName; }
    }
  }
}