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mhutchmhutch
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Import Roslyn support code for Highlight References
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‎Editor/Commands/NavigateToHighlightReferenceCommandHandler.cs

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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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//ROSLYN IMPORT: Microsoft.CodeAnalysis.Editor.ReferenceHighlighting.NavigateToHighlightReferenceCommandHandler
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Linq;
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using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
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using Microsoft.CodeAnalysis.Text.Shared.Extensions;
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using Microsoft.VisualStudio.Commanding;
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Editor;
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using Microsoft.VisualStudio.Text.Editor.Commanding;
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using Microsoft.VisualStudio.Text.Editor.Commanding.Commands;
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using Microsoft.VisualStudio.Text.Outlining;
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using Microsoft.VisualStudio.Text.Tagging;
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using Microsoft.VisualStudio.Utilities;
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using MonoDevelop.Xml.Editor.Tags;
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using VSCommanding = Microsoft.VisualStudio.Commanding;
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namespace MonoDevelop.Xml.Editor.Commands
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{
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[Export (typeof (VSCommanding.ICommandHandler))]
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[ContentType (XmlContentTypeNames.XmlCore)]
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[Name ("Xml Navigate to Highlighted Reference Command Handler")]
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internal partial class NavigateToHighlightReferenceCommandHandler :
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VSCommanding.ICommandHandler<NavigateToNextHighlightedReferenceCommandArgs>,
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VSCommanding.ICommandHandler<NavigateToPreviousHighlightedReferenceCommandArgs>
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{
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private readonly IOutliningManagerService _outliningManagerService;
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private readonly IViewTagAggregatorFactoryService _tagAggregatorFactory;
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public string DisplayName => "Navigate To Highlighted Reference";
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[ImportingConstructor]
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public NavigateToHighlightReferenceCommandHandler (
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IOutliningManagerService outliningManagerService,
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IViewTagAggregatorFactoryService tagAggregatorFactory)
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{
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_outliningManagerService = outliningManagerService ?? throw new ArgumentNullException (nameof (outliningManagerService));
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_tagAggregatorFactory = tagAggregatorFactory ?? throw new ArgumentNullException (nameof (tagAggregatorFactory));
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}
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public CommandState GetCommandState (NavigateToNextHighlightedReferenceCommandArgs args)
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{
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return GetCommandStateImpl (args);
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}
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public CommandState GetCommandState (NavigateToPreviousHighlightedReferenceCommandArgs args)
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{
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return GetCommandStateImpl (args);
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}
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private CommandState GetCommandStateImpl (EditorCommandArgs args)
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{
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using (var tagAggregator = _tagAggregatorFactory.CreateTagAggregator<NavigableHighlightTag> (args.TextView)) {
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var tagUnderCursor = FindTagUnderCaret (tagAggregator, args.TextView);
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return tagUnderCursor == null ? CommandState.Unavailable : CommandState.Available;
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}
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}
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public bool ExecuteCommand (NavigateToNextHighlightedReferenceCommandArgs args, CommandExecutionContext context)
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{
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return ExecuteCommandImpl (args, navigateToNext: true, context);
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}
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public bool ExecuteCommand (NavigateToPreviousHighlightedReferenceCommandArgs args, CommandExecutionContext context)
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{
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return ExecuteCommandImpl (args, navigateToNext: false, context);
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}
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private bool ExecuteCommandImpl (EditorCommandArgs args, bool navigateToNext, CommandExecutionContext context)
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{
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using (var tagAggregator = _tagAggregatorFactory.CreateTagAggregator<NavigableHighlightTag> (args.TextView)) {
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var tagUnderCursor = FindTagUnderCaret (tagAggregator, args.TextView);
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if (tagUnderCursor == null) {
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return false;
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}
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var spans = GetTags (tagAggregator, args.TextView.TextSnapshot.GetFullSpan()).ToList ();
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var destTag = GetDestinationTag (tagUnderCursor.Value, spans, navigateToNext);
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if (args.TextView.TryMoveCaretToAndEnsureVisible (destTag.Start, _outliningManagerService)) {
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args.TextView.SetSelection (destTag);
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}
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}
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return true;
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}
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private static IEnumerable<SnapshotSpan> GetTags (
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ITagAggregator<NavigableHighlightTag> tagAggregator,
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SnapshotSpan span)
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{
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return tagAggregator.GetTags (span)
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.SelectMany (tag => tag.Span.GetSpans (span.Snapshot.TextBuffer))
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.OrderBy (tag => tag.Start);
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}
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private static SnapshotSpan GetDestinationTag (
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SnapshotSpan tagUnderCursor,
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List<SnapshotSpan> orderedTagSpans,
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bool navigateToNext)
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{
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var destIndex = orderedTagSpans.BinarySearch (tagUnderCursor, new StartComparer ());
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destIndex += navigateToNext ? 1 : -1;
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if (destIndex < 0) {
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destIndex = orderedTagSpans.Count - 1;
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} else if (destIndex == orderedTagSpans.Count) {
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destIndex = 0;
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}
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return orderedTagSpans[destIndex];
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}
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private SnapshotSpan? FindTagUnderCaret (
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ITagAggregator<NavigableHighlightTag> tagAggregator,
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ITextView textView)
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{
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// We always want to be working with the surface buffer here, so this line is correct
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var caretPosition = textView.Caret.Position.BufferPosition.Position;
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var tags = GetTags (tagAggregator, new SnapshotSpan (textView.TextSnapshot, new Span (caretPosition, 0)));
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return tags.Any ()
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? tags.First ()
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: (SnapshotSpan?)null;
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}
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private class StartComparer : IComparer<SnapshotSpan>
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{
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public int Compare (SnapshotSpan x, SnapshotSpan y)
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{
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return x.Start.CompareTo (y.Start);
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}
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}
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}
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}

‎Editor/Roslyn/Extensions/IBufferGraphExtensions.cs

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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Linq;
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Projection;
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namespace Microsoft.CodeAnalysis.Editor.Shared.Extensions
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{
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internal enum BufferMapDirection
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{
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Identity,
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Down,
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Up,
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Unrelated
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}
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internal static class IBufferGraphExtensions
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{
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public static SnapshotSpan? MapUpOrDownToFirstMatch (this IBufferGraph bufferGraph, SnapshotSpan span, Predicate<ITextSnapshot> match)
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{
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var spans = bufferGraph.MapDownToFirstMatch (span, SpanTrackingMode.EdgeExclusive, match);
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if (!spans.Any ()) {
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spans = bufferGraph.MapUpToFirstMatch (span, SpanTrackingMode.EdgeExclusive, match);
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}
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return spans.Select (s => (SnapshotSpan?)s).FirstOrDefault ();
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}
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public static SnapshotSpan? MapUpOrDownToBuffer (this IBufferGraph bufferGraph, SnapshotSpan span, ITextBuffer targetBuffer)
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{
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var direction = ClassifyBufferMapDirection (span.Snapshot.TextBuffer, targetBuffer);
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switch (direction) {
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case BufferMapDirection.Identity:
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return span;
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case BufferMapDirection.Down: {
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var spans = bufferGraph.MapDownToBuffer (span, SpanTrackingMode.EdgeExclusive, targetBuffer);
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return spans.Select (s => (SnapshotSpan?)s).FirstOrDefault ();
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}
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case BufferMapDirection.Up: {
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var spans = bufferGraph.MapUpToBuffer (span, SpanTrackingMode.EdgeExclusive, targetBuffer);
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return spans.Select (s => (SnapshotSpan?)s).FirstOrDefault ();
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}
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default:
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return null;
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}
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}
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public static SnapshotPoint? MapUpOrDownToBuffer (this IBufferGraph bufferGraph, SnapshotPoint point, ITextBuffer targetBuffer)
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{
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var direction = ClassifyBufferMapDirection (point.Snapshot.TextBuffer, targetBuffer);
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switch (direction) {
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case BufferMapDirection.Identity:
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return point;
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case BufferMapDirection.Down: {
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// TODO (https://github.com/dotnet/roslyn/issues/5281): Remove try-catch.
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try {
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return bufferGraph.MapDownToInsertionPoint (point, PointTrackingMode.Positive, s => s == targetBuffer.CurrentSnapshot);
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} catch (ArgumentOutOfRangeException) when (bufferGraph.TopBuffer.ContentType.TypeName == "Interactive Content") {
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// Suppress this to work around DevDiv #144964.
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// Note: Other callers might be affected, but this is the narrowest workaround for the observed problems.
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// A fix is already being reviewed, so a broader change is not required.
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return null;
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}
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}
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case BufferMapDirection.Up: {
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return bufferGraph.MapUpToBuffer (point, PointTrackingMode.Positive, PositionAffinity.Predecessor, targetBuffer);
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}
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default:
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return null;
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}
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}
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public static BufferMapDirection ClassifyBufferMapDirection (ITextBuffer startBuffer, ITextBuffer destinationBuffer)
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{
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if (startBuffer == destinationBuffer) {
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return BufferMapDirection.Identity;
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}
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// Are we trying to map down or up?
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if (startBuffer is IProjectionBufferBase startProjBuffer && IsSourceBuffer (startProjBuffer, destinationBuffer)) {
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return BufferMapDirection.Down;
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}
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if (destinationBuffer is IProjectionBufferBase destProjBuffer && IsSourceBuffer (destProjBuffer, startBuffer)) {
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return BufferMapDirection.Up;
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}
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return BufferMapDirection.Unrelated;
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}
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private static bool IsSourceBuffer (IProjectionBufferBase top, ITextBuffer bottom)
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{
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return top.SourceBuffers.Contains (bottom) ||
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top.SourceBuffers.OfType<IProjectionBufferBase> ().Any (b => IsSourceBuffer (b, bottom));
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}
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}
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}

‎Editor/Roslyn/Extensions/ITextSnapshotExtensions.cs

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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Tagging;
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using Roslyn.Utilities;
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namespace Microsoft.CodeAnalysis.Text.Shared.Extensions
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{
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internal static partial class ITextSnapshotExtensions
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{
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public static SnapshotPoint GetPoint (this ITextSnapshot snapshot, int position)
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=> new SnapshotPoint (snapshot, position);
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public static SnapshotPoint? TryGetPoint (this ITextSnapshot snapshot, int lineNumber, int columnIndex)
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{
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var position = snapshot.TryGetPosition (lineNumber, columnIndex);
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if (position.HasValue) {
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return new SnapshotPoint (snapshot, position.Value);
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} else {
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return null;
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}
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}
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/*
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/// <summary>
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/// Convert a <see cref="LinePositionSpan"/> to <see cref="TextSpan"/>.
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/// </summary>
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public static TextSpan GetTextSpan (this ITextSnapshot snapshot, LinePositionSpan span)
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{
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return TextSpan.FromBounds (
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GetPosition (snapshot, span.Start.Line, span.Start.Character),
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GetPosition (snapshot, span.End.Line, span.End.Character));
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}
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*/
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public static int GetPosition (this ITextSnapshot snapshot, int lineNumber, int columnIndex)
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=> TryGetPosition (snapshot, lineNumber, columnIndex).Value;
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public static int? TryGetPosition (this ITextSnapshot snapshot, int lineNumber, int columnIndex)
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{
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if (lineNumber < 0 || lineNumber >= snapshot.LineCount) {
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return null;
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}
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var end = snapshot.GetLineFromLineNumber (lineNumber).Start.Position + columnIndex;
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if (end < 0 || end > snapshot.Length) {
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return null;
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}
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return end;
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}
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public static bool TryGetPosition (this ITextSnapshot snapshot, int lineNumber, int columnIndex, out SnapshotPoint position)
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{
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var result = 0;
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position = new SnapshotPoint ();
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if (lineNumber < 0 || lineNumber >= snapshot.LineCount) {
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return false;
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}
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var line = snapshot.GetLineFromLineNumber (lineNumber);
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if (columnIndex < 0 || columnIndex >= line.Length) {
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return false;
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}
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result = line.Start.Position + columnIndex;
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position = new SnapshotPoint (snapshot, result);
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return true;
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}
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public static SnapshotSpan GetSpan (this ITextSnapshot snapshot, int start, int length)
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=> new SnapshotSpan (snapshot, new Span (start, length));
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public static SnapshotSpan GetSpanFromBounds (this ITextSnapshot snapshot, int start, int end)
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=> new SnapshotSpan (snapshot, Span.FromBounds (start, end));
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public static SnapshotSpan GetSpan (this ITextSnapshot snapshot, Span span)
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=> new SnapshotSpan (snapshot, span);
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public static ITagSpan<TTag> GetTagSpan<TTag> (this ITextSnapshot snapshot, Span span, TTag tag)
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where TTag : ITag
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{
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return new TagSpan<TTag> (new SnapshotSpan (snapshot, span), tag);
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}
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public static SnapshotSpan GetSpan (this ITextSnapshot snapshot, int startLine, int startIndex, int endLine, int endIndex)
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{
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return TryGetSpan (snapshot, startLine, startIndex, endLine, endIndex).Value;
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}
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public static SnapshotSpan? TryGetSpan (this ITextSnapshot snapshot, int startLine, int startIndex, int endLine, int endIndex)
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{
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var startPosition = snapshot.TryGetPosition (startLine, startIndex);
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var endPosition = snapshot.TryGetPosition (endLine, endIndex);
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if (startPosition == null || endPosition == null) {
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return null;
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}
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return new SnapshotSpan (snapshot, Span.FromBounds (startPosition.Value, endPosition.Value));
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}
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public static SnapshotSpan GetFullSpan (this ITextSnapshot snapshot)
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{
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Contract.ThrowIfNull (snapshot);
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return new SnapshotSpan (snapshot, new Span (0, snapshot.Length));
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}
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public static NormalizedSnapshotSpanCollection GetSnapshotSpanCollection (this ITextSnapshot snapshot)
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{
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Contract.ThrowIfNull (snapshot);
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return new NormalizedSnapshotSpanCollection (snapshot.GetFullSpan ());
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}
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public static void GetLineAndCharacter (this ITextSnapshot snapshot, int position, out int lineNumber, out int characterIndex)
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{
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var line = snapshot.GetLineFromPosition (position);
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lineNumber = line.LineNumber;
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characterIndex = position - line.Start.Position;
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}
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/// <summary>
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/// Returns the leading whitespace of the line located at the specified position in the given snapshot.
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/// </summary>
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public static string GetLeadingWhitespaceOfLineAtPosition (this ITextSnapshot snapshot, int position)
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{
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Contract.ThrowIfNull (snapshot);
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var line = snapshot.GetLineFromPosition (position);
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var linePosition = line.GetFirstNonWhitespacePosition ();
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if (!linePosition.HasValue) {
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return line.GetText ();
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}
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var lineText = line.GetText ();
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return lineText.Substring (0, linePosition.Value - line.Start);
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}
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public static bool AreOnSameLine (this ITextSnapshot snapshot, int x1, int x2)
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=> snapshot.GetLineNumberFromPosition (x1) == snapshot.GetLineNumberFromPosition (x2);
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}
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}

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