320 lines
13 KiB
C#
320 lines
13 KiB
C#
// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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namespace Unity.CodeEditor.Document
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{
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/// <summary>
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/// A document representing a source code file for refactoring.
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/// Line and column counting starts at 1.
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/// Offset counting starts at 0.
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/// </summary>
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internal interface IDocument : ITextSource, IServiceProvider
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{
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/// <summary>
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/// Gets/Sets the text of the whole document..
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/// </summary>
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new string Text { get; set; } // hides ITextSource.Text to add the setter
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/// <summary>
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/// This event is called directly before a change is applied to the document.
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/// </summary>
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/// <remarks>
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/// It is invalid to modify the document within this event handler.
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/// Aborting the change (by throwing an exception) is likely to cause corruption of data structures
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/// that listen to the Changing and Changed events.
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/// </remarks>
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event EventHandler<TextChangeEventArgs> TextChanging;
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/// <summary>
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/// This event is called directly after a change is applied to the document.
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/// </summary>
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/// <remarks>
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/// It is invalid to modify the document within this event handler.
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/// Aborting the event handler (by throwing an exception) is likely to cause corruption of data structures
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/// that listen to the Changing and Changed events.
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/// </remarks>
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event EventHandler<TextChangeEventArgs> TextChanged;
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/// <summary>
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/// This event is called after a group of changes is completed.
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/// </summary>
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/// <seealso cref="EndUndoableAction"/>
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event EventHandler ChangeCompleted;
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/// <summary>
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/// Gets the number of lines in the document.
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/// </summary>
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int LineCount { get; }
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/// <summary>
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/// Gets the document line with the specified number.
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/// </summary>
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/// <param name="lineNumber">The number of the line to retrieve. The first line has number 1.</param>
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IDocumentLine GetLineByNumber(int lineNumber);
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/// <summary>
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/// Gets the document line that contains the specified offset.
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/// </summary>
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IDocumentLine GetLineByOffset(int offset);
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/// <summary>
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/// Gets the offset from a text location.
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/// </summary>
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/// <seealso cref="GetLocation"/>
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int GetOffset(int line, int column);
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/// <summary>
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/// Gets the offset from a text location.
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/// </summary>
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/// <seealso cref="GetLocation"/>
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int GetOffset(TextLocation location);
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/// <summary>
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/// Gets the location from an offset.
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/// </summary>
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/// <seealso cref="GetOffset(TextLocation)"/>
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TextLocation GetLocation(int offset);
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/// <summary>
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/// Inserts text.
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/// </summary>
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/// <param name="offset">The offset at which the text is inserted.</param>
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/// <param name="text">The new text.</param>
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/// <remarks>
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/// Anchors positioned exactly at the insertion offset will move according to their movement type.
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/// For AnchorMovementType.Default, they will move behind the inserted text.
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/// The caret will also move behind the inserted text.
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/// </remarks>
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void Insert(int offset, string text);
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/// <summary>
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/// Inserts text.
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/// </summary>
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/// <param name="offset">The offset at which the text is inserted.</param>
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/// <param name="text">The new text.</param>
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/// <remarks>
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/// Anchors positioned exactly at the insertion offset will move according to their movement type.
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/// For AnchorMovementType.Default, they will move behind the inserted text.
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/// The caret will also move behind the inserted text.
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/// </remarks>
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void Insert(int offset, ITextSource text);
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/// <summary>
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/// Inserts text.
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/// </summary>
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/// <param name="offset">The offset at which the text is inserted.</param>
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/// <param name="text">The new text.</param>
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/// <param name="defaultAnchorMovementType">
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/// Anchors positioned exactly at the insertion offset will move according to the anchor's movement type.
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/// For AnchorMovementType.Default, they will move according to the movement type specified by this parameter.
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/// The caret will also move according to the <paramref name="defaultAnchorMovementType"/> parameter.
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/// </param>
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void Insert(int offset, string text, AnchorMovementType defaultAnchorMovementType);
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/// <summary>
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/// Inserts text.
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/// </summary>
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/// <param name="offset">The offset at which the text is inserted.</param>
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/// <param name="text">The new text.</param>
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/// <param name="defaultAnchorMovementType">
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/// Anchors positioned exactly at the insertion offset will move according to the anchor's movement type.
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/// For AnchorMovementType.Default, they will move according to the movement type specified by this parameter.
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/// The caret will also move according to the <paramref name="defaultAnchorMovementType"/> parameter.
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/// </param>
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void Insert(int offset, ITextSource text, AnchorMovementType defaultAnchorMovementType);
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/// <summary>
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/// Removes text.
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/// </summary>
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/// <param name="offset">Starting offset of the text to be removed.</param>
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/// <param name="length">Length of the text to be removed.</param>
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void Remove(int offset, int length);
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/// <summary>
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/// Replaces text.
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/// </summary>
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/// <param name="offset">The starting offset of the text to be replaced.</param>
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/// <param name="length">The length of the text to be replaced.</param>
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/// <param name="newText">The new text.</param>
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void Replace(int offset, int length, string newText);
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/// <summary>
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/// Replaces text.
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/// </summary>
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/// <param name="offset">The starting offset of the text to be replaced.</param>
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/// <param name="length">The length of the text to be replaced.</param>
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/// <param name="newText">The new text.</param>
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void Replace(int offset, int length, ITextSource newText);
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/// <summary>
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/// Make the document combine the following actions into a single
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/// action for undo purposes.
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/// </summary>
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void StartUndoableAction();
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/// <summary>
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/// Ends the undoable action started with <see cref="StartUndoableAction"/>.
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/// </summary>
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void EndUndoableAction();
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/// <summary>
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/// Creates an undo group. Dispose the returned value to close the undo group.
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/// </summary>
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/// <returns>An object that closes the undo group when Dispose() is called.</returns>
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IDisposable OpenUndoGroup();
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/// <summary>
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/// Creates a new <see cref="ITextAnchor"/> at the specified offset.
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/// </summary>
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/// <inheritdoc cref="ITextAnchor" select="remarks|example"/>
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ITextAnchor CreateAnchor(int offset);
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/// <summary>
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/// Gets the name of the file the document is stored in.
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/// Could also be a non-existent dummy file name or null if no name has been set.
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/// </summary>
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string FileName { get; }
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/// <summary>
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/// Fired when the file name of the document changes.
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/// </summary>
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event EventHandler FileNameChanged;
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}
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/// <summary>
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/// A line inside a <see cref="IDocument"/>.
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/// </summary>
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internal interface IDocumentLine : ISegment
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{
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/// <summary>
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/// Gets the length of this line, including the line delimiter.
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/// </summary>
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int TotalLength { get; }
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/// <summary>
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/// Gets the length of the line terminator.
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/// Returns 1 or 2; or 0 at the end of the document.
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/// </summary>
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int DelimiterLength { get; }
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/// <summary>
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/// Gets the number of this line.
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/// The first line has the number 1.
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/// </summary>
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int LineNumber { get; }
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/// <summary>
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/// Gets the previous line. Returns null if this is the first line in the document.
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/// </summary>
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IDocumentLine PreviousLine { get; }
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/// <summary>
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/// Gets the next line. Returns null if this is the last line in the document.
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/// </summary>
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IDocumentLine NextLine { get; }
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/// <summary>
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/// Gets whether the line was deleted.
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/// </summary>
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bool IsDeleted { get; }
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}
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/// <summary>
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/// Describes a change of the document text.
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/// This class is thread-safe.
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/// </summary>
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internal class TextChangeEventArgs : EventArgs
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{
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/// <summary>
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/// The offset at which the change occurs.
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/// </summary>
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internal int Offset { get; }
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/// <summary>
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/// The text that was removed.
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/// </summary>
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internal ITextSource RemovedText { get; }
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/// <summary>
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/// The number of characters removed.
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/// </summary>
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internal int RemovalLength => RemovedText.TextLength;
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/// <summary>
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/// The text that was inserted.
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/// </summary>
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internal ITextSource InsertedText { get; }
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/// <summary>
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/// The number of characters inserted.
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/// </summary>
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internal int InsertionLength => InsertedText.TextLength;
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/// <summary>
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/// Creates a new TextChangeEventArgs object.
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/// </summary>
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internal TextChangeEventArgs(int offset, string removedText, string insertedText)
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{
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if (offset < 0)
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throw new ArgumentOutOfRangeException(nameof(offset), offset, "offset must not be negative");
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Offset = offset;
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RemovedText = removedText != null ? new StringTextSource(removedText) : StringTextSource.Empty;
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InsertedText = insertedText != null ? new StringTextSource(insertedText) : StringTextSource.Empty;
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}
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/// <summary>
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/// Creates a new TextChangeEventArgs object.
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/// </summary>
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internal TextChangeEventArgs(int offset, ITextSource removedText, ITextSource insertedText)
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{
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if (offset < 0)
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throw new ArgumentOutOfRangeException(nameof(offset), offset, "offset must not be negative");
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Offset = offset;
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RemovedText = removedText ?? StringTextSource.Empty;
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InsertedText = insertedText ?? StringTextSource.Empty;
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}
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/// <summary>
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/// Gets the new offset where the specified offset moves after this document change.
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/// </summary>
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internal virtual int GetNewOffset(int offset, AnchorMovementType movementType = AnchorMovementType.Default)
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{
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if (offset >= Offset && offset <= Offset + RemovalLength)
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{
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if (movementType == AnchorMovementType.BeforeInsertion)
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return Offset;
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return Offset + InsertionLength;
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}
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if (offset > Offset)
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{
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return offset + InsertionLength - RemovalLength;
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}
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return offset;
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}
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/// <summary>
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/// Creates TextChangeEventArgs for the reverse change.
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/// </summary>
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internal virtual TextChangeEventArgs Invert()
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{
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return new TextChangeEventArgs(Offset, InsertedText, RemovedText);
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}
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}
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} |