84 lines
3.3 KiB
C#
84 lines
3.3 KiB
C#
/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Operations;
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using Microsoft.VisualStudio.Utilities;
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namespace dnSpy.Text.Operations {
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/// <summary>
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/// Default navigator. A word is just one character. This one shouldn't be used at all,
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/// it's just the default one created by <see cref="TextStructureNavigatorSelectorService"/>
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/// if nothing else is found.
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/// </summary>
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sealed class TextStructureNavigator : ITextStructureNavigator {
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public IContentType ContentType { get; }
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readonly ITextBuffer textBuffer;
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public TextStructureNavigator(ITextBuffer textBuffer, IContentType contentType) {
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this.textBuffer = textBuffer ?? throw new ArgumentNullException(nameof(textBuffer));
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ContentType = contentType ?? throw new ArgumentNullException(nameof(contentType));
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}
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public TextExtent GetExtentOfWord(SnapshotPoint currentPosition) {
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if (currentPosition.Snapshot?.TextBuffer != textBuffer)
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throw new ArgumentException();
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if (currentPosition.Position >= currentPosition.Snapshot.Length)
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return new TextExtent(new SnapshotSpan(currentPosition, currentPosition), true);
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return new TextExtent(new SnapshotSpan(currentPosition, currentPosition + 1), true);
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}
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public SnapshotSpan GetSpanOfEnclosing(SnapshotSpan activeSpan) {
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if (activeSpan.Snapshot?.TextBuffer != textBuffer)
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throw new ArgumentException();
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return new SnapshotSpan(activeSpan.Snapshot, 0, activeSpan.Snapshot.Length);
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}
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public SnapshotSpan GetSpanOfFirstChild(SnapshotSpan activeSpan) {
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if (activeSpan.Snapshot?.TextBuffer != textBuffer)
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throw new ArgumentException();
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if (activeSpan.IsEmpty || activeSpan.Length != 1)
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return GetSpanOfEnclosing(activeSpan);
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return new SnapshotSpan(activeSpan.Snapshot, 0, activeSpan.Snapshot.Length == 0 ? 0 : 1);
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}
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public SnapshotSpan GetSpanOfNextSibling(SnapshotSpan activeSpan) {
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if (activeSpan.Snapshot?.TextBuffer != textBuffer)
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throw new ArgumentException();
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if (activeSpan.IsEmpty || activeSpan.Length != 1)
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return GetSpanOfEnclosing(activeSpan);
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if (activeSpan.Start.Position + 1 >= activeSpan.Snapshot.Length)
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return GetSpanOfEnclosing(activeSpan);
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return new SnapshotSpan(activeSpan.Start + 1, activeSpan.Start + 2);
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}
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public SnapshotSpan GetSpanOfPreviousSibling(SnapshotSpan activeSpan) {
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if (activeSpan.Snapshot?.TextBuffer != textBuffer)
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throw new ArgumentException();
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if (activeSpan.IsEmpty || activeSpan.Length != 1)
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return GetSpanOfEnclosing(activeSpan);
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if (activeSpan.Start.Position == 0)
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return GetSpanOfEnclosing(activeSpan);
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return new SnapshotSpan(activeSpan.Start - 1, activeSpan.Start);
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}
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}
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}
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