source: branches/RemoveBackwardsCompatibility/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Document/IDocument.cs @ 14113

// 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;

namespace ICSharpCode.AvalonEdit.Document
{
  #if !NREFACTORY
  /// <summary>
  /// A document representing a source code file for refactoring.
  /// Line and column counting starts at 1.
  /// Offset counting starts at 0.
  /// </summary>
  public interface IDocument : ITextSource, IServiceProvider
  {
    #if NREFACTORY
    /// <summary>
    /// Creates an immutable snapshot of this document.
    /// </summary>
    IDocument CreateDocumentSnapshot();
    #endif
    
    /// <summary>
    /// Gets/Sets the text of the whole document..
    /// </summary>
    new string Text { get; set; } // hides ITextSource.Text to add the setter
    
    /// <summary>
    /// This event is called directly before a change is applied to the document.
    /// </summary>
    /// <remarks>
    /// It is invalid to modify the document within this event handler.
    /// Aborting the change (by throwing an exception) is likely to cause corruption of data structures
    /// that listen to the Changing and Changed events.
    /// </remarks>
    event EventHandler<TextChangeEventArgs> TextChanging;
    
    /// <summary>
    /// This event is called directly after a change is applied to the document.
    /// </summary>
    /// <remarks>
    /// It is invalid to modify the document within this event handler.
    /// Aborting the event handler (by throwing an exception) is likely to cause corruption of data structures
    /// that listen to the Changing and Changed events.
    /// </remarks>
    event EventHandler<TextChangeEventArgs> TextChanged;
    
    /// <summary>
    /// This event is called after a group of changes is completed.
    /// </summary>
    /// <seealso cref="EndUndoableAction"/>
    event EventHandler ChangeCompleted;
    
    /// <summary>
    /// Gets the number of lines in the document.
    /// </summary>
    int LineCount { get; }
    
    /// <summary>
    /// Gets the document line with the specified number.
    /// </summary>
    /// <param name="lineNumber">The number of the line to retrieve. The first line has number 1.</param>
    IDocumentLine GetLineByNumber(int lineNumber);
    
    /// <summary>
    /// Gets the document line that contains the specified offset.
    /// </summary>
    IDocumentLine GetLineByOffset(int offset);
    
    /// <summary>
    /// Gets the offset from a text location.
    /// </summary>
    /// <seealso cref="GetLocation"/>
    int GetOffset(int line, int column);
    
    /// <summary>
    /// Gets the offset from a text location.
    /// </summary>
    /// <seealso cref="GetLocation"/>
    int GetOffset(TextLocation location);
    
    /// <summary>
    /// Gets the location from an offset.
    /// </summary>
    /// <seealso cref="GetOffset(TextLocation)"/>
    TextLocation GetLocation(int offset);
    
    /// <summary>
    /// Inserts text.
    /// </summary>
    /// <param name="offset">The offset at which the text is inserted.</param>
    /// <param name="text">The new text.</param>
    /// <remarks>
    /// Anchors positioned exactly at the insertion offset will move according to their movement type.
    /// For AnchorMovementType.Default, they will move behind the inserted text.
    /// The caret will also move behind the inserted text.
    /// </remarks>
    void Insert(int offset, string text);
    
    /// <summary>
    /// Inserts text.
    /// </summary>
    /// <param name="offset">The offset at which the text is inserted.</param>
    /// <param name="text">The new text.</param>
    /// <remarks>
    /// Anchors positioned exactly at the insertion offset will move according to their movement type.
    /// For AnchorMovementType.Default, they will move behind the inserted text.
    /// The caret will also move behind the inserted text.
    /// </remarks>
    void Insert(int offset, ITextSource text);
    
    /// <summary>
    /// Inserts text.
    /// </summary>
    /// <param name="offset">The offset at which the text is inserted.</param>
    /// <param name="text">The new text.</param>
    /// <param name="defaultAnchorMovementType">
    /// Anchors positioned exactly at the insertion offset will move according to the anchor's movement type.
    /// For AnchorMovementType.Default, they will move according to the movement type specified by this parameter.
    /// The caret will also move according to the <paramref name="defaultAnchorMovementType"/> parameter.
    /// </param>
    void Insert(int offset, string text, AnchorMovementType defaultAnchorMovementType);
    
    /// <summary>
    /// Inserts text.
    /// </summary>
    /// <param name="offset">The offset at which the text is inserted.</param>
    /// <param name="text">The new text.</param>
    /// <param name="defaultAnchorMovementType">
    /// Anchors positioned exactly at the insertion offset will move according to the anchor's movement type.
    /// For AnchorMovementType.Default, they will move according to the movement type specified by this parameter.
    /// The caret will also move according to the <paramref name="defaultAnchorMovementType"/> parameter.
    /// </param>
    void Insert(int offset, ITextSource text, AnchorMovementType defaultAnchorMovementType);
    
    /// <summary>
    /// Removes text.
    /// </summary>
    /// <param name="offset">Starting offset of the text to be removed.</param>
    /// <param name="length">Length of the text to be removed.</param>
    void Remove(int offset, int length);
    
    /// <summary>
    /// Replaces text.
    /// </summary>
    /// <param name="offset">The starting offset of the text to be replaced.</param>
    /// <param name="length">The length of the text to be replaced.</param>
    /// <param name="newText">The new text.</param>
    void Replace(int offset, int length, string newText);
    
    /// <summary>
    /// Replaces text.
    /// </summary>
    /// <param name="offset">The starting offset of the text to be replaced.</param>
    /// <param name="length">The length of the text to be replaced.</param>
    /// <param name="newText">The new text.</param>
    void Replace(int offset, int length, ITextSource newText);
    
    /// <summary>
    /// Make the document combine the following actions into a single
    /// action for undo purposes.
    /// </summary>
    void StartUndoableAction();
    
    /// <summary>
    /// Ends the undoable action started with <see cref="StartUndoableAction"/>.
    /// </summary>
    void EndUndoableAction();
    
    /// <summary>
    /// Creates an undo group. Dispose the returned value to close the undo group.
    /// </summary>
    /// <returns>An object that closes the undo group when Dispose() is called.</returns>
    IDisposable OpenUndoGroup();
    
    /// <summary>
    /// Creates a new <see cref="ITextAnchor"/> at the specified offset.
    /// </summary>
    /// <inheritdoc cref="ITextAnchor" select="remarks|example"/>
    ITextAnchor CreateAnchor(int offset);
    
    /// <summary>
    /// Gets the name of the file the document is stored in.
    /// Could also be a non-existent dummy file name or null if no name has been set.
    /// </summary>
    string FileName { get; }
    
    /// <summary>
    /// Fired when the file name of the document changes.
    /// </summary>
    event EventHandler FileNameChanged;
  }
  
  /// <summary>
  /// A line inside a <see cref="IDocument"/>.
  /// </summary>
  public interface IDocumentLine : ISegment
  {
    /// <summary>
    /// Gets the length of this line, including the line delimiter.
    /// </summary>
    int TotalLength { get; }
    
    /// <summary>
    /// Gets the length of the line terminator.
    /// Returns 1 or 2; or 0 at the end of the document.
    /// </summary>
    int DelimiterLength { get; }
    
    /// <summary>
    /// Gets the number of this line.
    /// The first line has the number 1.
    /// </summary>
    int LineNumber { get; }
    
    /// <summary>
    /// Gets the previous line. Returns null if this is the first line in the document.
    /// </summary>
    IDocumentLine PreviousLine { get; }
    
    /// <summary>
    /// Gets the next line. Returns null if this is the last line in the document.
    /// </summary>
    IDocumentLine NextLine { get; }
    
    /// <summary>
    /// Gets whether the line was deleted.
    /// </summary>
    bool IsDeleted { get; }
  }
  
  /// <summary>
  /// Describes a change of the document text.
  /// This class is thread-safe.
  /// </summary>
  [Serializable]
  public class TextChangeEventArgs : EventArgs
  {
    readonly int offset;
    readonly ITextSource removedText;
    readonly ITextSource insertedText;
    
    /// <summary>
    /// The offset at which the change occurs.
    /// </summary>
    public int Offset {
      get { return offset; }
    }
    
    /// <summary>
    /// The text that was removed.
    /// </summary>
    public ITextSource RemovedText {
      get { return removedText; }
    }
    
    /// <summary>
    /// The number of characters removed.
    /// </summary>
    public int RemovalLength {
      get { return removedText.TextLength; }
    }
    
    /// <summary>
    /// The text that was inserted.
    /// </summary>
    public ITextSource InsertedText {
      get { return insertedText; }
    }
    
    /// <summary>
    /// The number of characters inserted.
    /// </summary>
    public int InsertionLength {
      get { return insertedText.TextLength; }
    }
    
    /// <summary>
    /// Creates a new TextChangeEventArgs object.
    /// </summary>
    public TextChangeEventArgs(int offset, string removedText, string insertedText)
    {
      if (offset < 0)
        throw new ArgumentOutOfRangeException("offset", offset, "offset must not be negative");
      this.offset = offset;
      this.removedText = removedText != null ? new StringTextSource(removedText) : StringTextSource.Empty;
      this.insertedText = insertedText != null ? new StringTextSource(insertedText) : StringTextSource.Empty;
    }
    
    /// <summary>
    /// Creates a new TextChangeEventArgs object.
    /// </summary>
    public TextChangeEventArgs(int offset, ITextSource removedText, ITextSource insertedText)
    {
      if (offset < 0)
        throw new ArgumentOutOfRangeException("offset", offset, "offset must not be negative");
      this.offset = offset;
      this.removedText = removedText ?? StringTextSource.Empty;
      this.insertedText = insertedText ?? StringTextSource.Empty;
    }
    
    /// <summary>
    /// Gets the new offset where the specified offset moves after this document change.
    /// </summary>
    public virtual int GetNewOffset(int offset, AnchorMovementType movementType = AnchorMovementType.Default)
    {
      if (offset >= this.Offset && offset <= this.Offset + this.RemovalLength) {
        if (movementType == AnchorMovementType.BeforeInsertion)
          return this.Offset;
        else
          return this.Offset + this.InsertionLength;
      } else if (offset > this.Offset) {
        return offset + this.InsertionLength - this.RemovalLength;
      } else {
        return offset;
      }
    }
    
    /// <summary>
    /// Creates TextChangeEventArgs for the reverse change.
    /// </summary>
    public virtual TextChangeEventArgs Invert()
    {
      return new TextChangeEventArgs(offset, insertedText, removedText);
    }
  }
  #endif
}