120 lines
4.9 KiB
C#
120 lines
4.9 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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/// 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 DocumentChangeEventArgs : TextChangeEventArgs
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{
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/// <summary>
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/// Gets the OffsetChangeMap associated with this document change.
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/// </summary>
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/// <remarks>The OffsetChangeMap instance is guaranteed to be frozen and thus thread-safe.</remarks>
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internal OffsetChangeMap OffsetChangeMap
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{
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get
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{
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OffsetChangeMap map = OffsetChangeMapOrNull;
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if (map == null)
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{
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// create OffsetChangeMap on demand
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map = OffsetChangeMap.FromSingleElement(CreateSingleChangeMapEntry());
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OffsetChangeMapOrNull = map;
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}
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return map;
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}
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}
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internal OffsetChangeMapEntry CreateSingleChangeMapEntry()
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{
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return new OffsetChangeMapEntry(Offset, RemovalLength, InsertionLength);
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}
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/// <summary>
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/// Gets the OffsetChangeMap, or null if the default offset map (=single replacement) is being used.
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/// </summary>
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internal OffsetChangeMap OffsetChangeMapOrNull { get; private set; }
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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 override int GetNewOffset(int offset, AnchorMovementType movementType = AnchorMovementType.Default)
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{
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if (OffsetChangeMapOrNull != null)
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return OffsetChangeMapOrNull.GetNewOffset(offset, movementType);
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return CreateSingleChangeMapEntry().GetNewOffset(offset, movementType);
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}
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/// <summary>
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/// Creates a new DocumentChangeEventArgs object.
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/// </summary>
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internal DocumentChangeEventArgs(int offset, string removedText, string insertedText)
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: this(offset, removedText, insertedText, null)
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{
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}
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/// <summary>
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/// Creates a new DocumentChangeEventArgs object.
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/// </summary>
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internal DocumentChangeEventArgs(int offset, string removedText, string insertedText, OffsetChangeMap offsetChangeMap)
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: base(offset, removedText, insertedText)
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{
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SetOffsetChangeMap(offsetChangeMap);
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}
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/// <summary>
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/// Creates a new DocumentChangeEventArgs object.
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/// </summary>
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internal DocumentChangeEventArgs(int offset, ITextSource removedText, ITextSource insertedText, OffsetChangeMap offsetChangeMap)
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: base(offset, removedText, insertedText)
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{
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SetOffsetChangeMap(offsetChangeMap);
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}
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private void SetOffsetChangeMap(OffsetChangeMap offsetChangeMap)
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{
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if (offsetChangeMap != null)
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{
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if (!offsetChangeMap.IsFrozen)
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throw new ArgumentException("The OffsetChangeMap must be frozen before it can be used in DocumentChangeEventArgs");
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if (!offsetChangeMap.IsValidForDocumentChange(Offset, RemovalLength, InsertionLength))
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throw new ArgumentException("OffsetChangeMap is not valid for this document change", nameof(offsetChangeMap));
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OffsetChangeMapOrNull = offsetChangeMap;
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}
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}
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/// <inheritdoc/>
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internal override TextChangeEventArgs Invert()
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{
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OffsetChangeMap map = OffsetChangeMapOrNull;
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if (map != null)
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{
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map = map.Invert();
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map.Freeze();
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}
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return new DocumentChangeEventArgs(Offset, InsertedText, RemovedText, map);
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}
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}
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}
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