98 lines
3.9 KiB
C#
98 lines
3.9 KiB
C#
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// 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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using System.Collections.Generic;
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using System.Linq;
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using Unity.CodeEditor.Document;
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namespace Unity.CodeEditor.Editing
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{
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/// <summary>
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/// Implementation for <see cref="IReadOnlySectionProvider"/> that stores the segments
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/// in a <see cref="TextSegmentCollection{T}"/>.
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/// </summary>
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internal class TextSegmentReadOnlySectionProvider<T> : IReadOnlySectionProvider where T : TextSegment
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{
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/// <summary>
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/// Gets the collection storing the read-only segments.
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/// </summary>
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internal TextSegmentCollection<T> Segments { get; }
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/// <summary>
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/// Creates a new TextSegmentReadOnlySectionProvider instance for the specified document.
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/// </summary>
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internal TextSegmentReadOnlySectionProvider(TextDocument textDocument)
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{
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Segments = new TextSegmentCollection<T>(textDocument);
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}
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/// <summary>
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/// Creates a new TextSegmentReadOnlySectionProvider instance using the specified TextSegmentCollection.
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/// </summary>
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internal TextSegmentReadOnlySectionProvider(TextSegmentCollection<T> segments)
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{
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Segments = segments ?? throw new ArgumentNullException(nameof(segments));
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}
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/// <summary>
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/// Gets whether insertion is possible at the specified offset.
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/// </summary>
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public virtual bool CanInsert(int offset)
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{
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return Segments.FindSegmentsContaining(offset)
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.All(segment => segment.StartOffset >= offset || offset >= segment.EndOffset);
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}
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/// <summary>
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/// Gets the deletable segments inside the given segment.
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/// </summary>
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public virtual IEnumerable<ISegment> GetDeletableSegments(ISegment segment)
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{
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if (segment == null)
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throw new ArgumentNullException(nameof(segment));
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if (segment.Length == 0 && CanInsert(segment.Offset))
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{
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yield return segment;
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yield break;
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}
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var readonlyUntil = segment.Offset;
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foreach (var ts in Segments.FindOverlappingSegments(segment))
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{
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var start = ts.StartOffset;
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var end = start + ts.Length;
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if (start > readonlyUntil)
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{
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yield return new SimpleSegment(readonlyUntil, start - readonlyUntil);
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}
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if (end > readonlyUntil)
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{
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readonlyUntil = end;
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}
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}
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var endOffset = segment.EndOffset;
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if (readonlyUntil < endOffset)
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{
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yield return new SimpleSegment(readonlyUntil, endOffset - readonlyUntil);
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}
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}
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}
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}
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