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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
namespace Microsoft.VisualStudio.Text.Utilities
{
using System;
using System.Collections.Generic;
using System.Globalization;
using Microsoft.VisualStudio.Text.Projection;
internal class MappingSpanSnapshot : IMappingSpan
{
private ITextSnapshot _root;
private SnapshotSpan _anchor;
private SpanTrackingMode _trackingMode;
private IBufferGraph _graph;
private bool _unmappable = false;
public static IMappingSpan Create(ITextSnapshot root, SnapshotSpan anchor, SpanTrackingMode trackingMode, IBufferGraph graph)
{
return new MappingSpanSnapshot(root, anchor, trackingMode, graph);
}
private MappingSpanSnapshot(ITextSnapshot root, SnapshotSpan anchor, SpanTrackingMode trackingMode, IBufferGraph graph)
{
//Anchor and root are expected to be from concurrent snapshots
ITextSnapshot correspondingAnchorSnapshot = MappingHelper.FindCorrespondingSnapshot(root, anchor.Snapshot.TextBuffer);
_root = root;
if (correspondingAnchorSnapshot != null)
_anchor = anchor.TranslateTo(correspondingAnchorSnapshot, trackingMode);
else
{
_anchor = anchor;
_unmappable = true;
}
_trackingMode = trackingMode;
_graph = graph;
}
public NormalizedSnapshotSpanCollection GetSpans(ITextBuffer targetBuffer)
{
if (targetBuffer == null)
throw new ArgumentNullException(nameof(targetBuffer));
if (_unmappable)
return NormalizedSnapshotSpanCollection.Empty;
if (targetBuffer.Properties.ContainsProperty("IdentityMapping"))
{
// text buffer properties uses the hybrid dictionary, which requires TWO lookups to determine that
// a key is not present. Since this test usually fails, do it the hard way (the second lookup shows up
// in scrolling profiles).
ITextBuffer doppelganger = (ITextBuffer)targetBuffer.Properties["IdentityMapping"];
if (doppelganger == _anchor.Snapshot.TextBuffer)
{
// We are mapping up from a doppelganger buffer; the coordinates will be the same. We
// just need to figure out the right snapshot.
ITextSnapshot targetSnapshot = MappingHelper.FindCorrespondingSnapshot(_root, targetBuffer);
return new NormalizedSnapshotSpanCollection(new SnapshotSpan(targetSnapshot, _anchor.Span));
}
}
//Try mapping down first.
FrugalList<SnapshotSpan> mappedSpans = new FrugalList<SnapshotSpan>();
MappingHelper.MapDownToBufferNoTrack(_anchor, targetBuffer, mappedSpans);
if (mappedSpans.Count == 0)
{
//Unable to map down ... try mapping up.
this.MapUpToBufferNoTrack(targetBuffer, mappedSpans);
}
return new NormalizedSnapshotSpanCollection(mappedSpans);
}
public NormalizedSnapshotSpanCollection GetSpans(ITextSnapshot targetSnapshot)
{
if (targetSnapshot == null)
throw new ArgumentNullException(nameof(targetSnapshot));
if (_unmappable)
return NormalizedSnapshotSpanCollection.Empty;
NormalizedSnapshotSpanCollection results = this.GetSpans(targetSnapshot.TextBuffer);
if ((results.Count > 0) && (results[0].Snapshot != targetSnapshot))
{
FrugalList<SnapshotSpan> translatedSpans = new FrugalList<SnapshotSpan>();
foreach (SnapshotSpan s in results)
{
translatedSpans.Add(s.TranslateTo(targetSnapshot, _trackingMode));
}
results = new NormalizedSnapshotSpanCollection(translatedSpans);
}
return results;
}
public NormalizedSnapshotSpanCollection GetSpans(Predicate<ITextBuffer> match)
{
if (_unmappable)
return NormalizedSnapshotSpanCollection.Empty;
//Try mapping down first.
FrugalList<SnapshotSpan> mappedSpans = new FrugalList<SnapshotSpan>();
MappingHelper.MapDownToFirstMatchNoTrack(_anchor, match, mappedSpans);
if (mappedSpans.Count == 0)
{
//Unable to map down ... try mapping up.
this.MapUpToBufferNoTrack(match, mappedSpans);
}
return new NormalizedSnapshotSpanCollection(mappedSpans);
}
public IMappingPoint Start
{
get
{
return MappingPointSnapshot.Create(_root, _anchor.Start,
(_trackingMode == SpanTrackingMode.EdgeInclusive ||
_trackingMode == SpanTrackingMode.EdgeNegative)
? PointTrackingMode.Negative
: PointTrackingMode.Positive,
_graph);
}
}
public IMappingPoint End
{
get
{
return MappingPointSnapshot.Create(_root, _anchor.End,
(_trackingMode == SpanTrackingMode.EdgeExclusive ||
_trackingMode == SpanTrackingMode.EdgeNegative)
? PointTrackingMode.Negative
: PointTrackingMode.Positive,
_graph);
}
}
public ITextBuffer AnchorBuffer
{
get { return _anchor.Snapshot.TextBuffer; }
}
public IBufferGraph BufferGraph
{
get { return _graph; }
}
private void MapUpToBufferNoTrack(ITextBuffer targetBuffer, FrugalList<SnapshotSpan> mappedSpans)
{
ITextSnapshot targetSnapshot = MappingHelper.FindCorrespondingSnapshot(_root, targetBuffer);
if (targetSnapshot != null)
{
//Map _anchor up to targetSnapshot (they should be concurrent snapshots)
MapUpToSnapshotNoTrack(targetSnapshot, mappedSpans);
}
}
private void MapUpToBufferNoTrack(Predicate<ITextBuffer> match, FrugalList<SnapshotSpan> mappedSpans)
{
ITextSnapshot targetSnapshot = MappingHelper.FindCorrespondingSnapshot(_root, match);
if (targetSnapshot != null)
{
//Map _anchor up to targetSnapshot (they should be concurrent snapshots)
MapUpToSnapshotNoTrack(targetSnapshot, mappedSpans);
}
}
private void MapUpToSnapshotNoTrack(ITextSnapshot targetSnapshot, FrugalList<SnapshotSpan> mappedSpans)
{
MappingSpanSnapshot.MapUpToSnapshotNoTrack(targetSnapshot, _anchor, mappedSpans);
}
public static void MapUpToSnapshotNoTrack(ITextSnapshot targetSnapshot, SnapshotSpan anchor, IList<SnapshotSpan> mappedSpans)
{
if (anchor.Snapshot == targetSnapshot)
mappedSpans.Add(anchor);
else
{
IProjectionSnapshot targetAsProjection = targetSnapshot as IProjectionSnapshot;
if (targetAsProjection != null)
{
var sourceSnapshots = targetAsProjection.SourceSnapshots;
for (int s = 0; s < sourceSnapshots.Count; ++s)
{
FrugalList<SnapshotSpan> downSpans = new FrugalList<SnapshotSpan>();
MapUpToSnapshotNoTrack(sourceSnapshots[s], anchor, downSpans);
for (int ds = 0; ds < downSpans.Count; ++ds)
{
var upSpans = targetAsProjection.MapFromSourceSnapshot(downSpans[ds]);
for (int us = 0; us < upSpans.Count; ++us)
{
mappedSpans.Add(new SnapshotSpan(targetSnapshot, upSpans[us]));
}
}
}
}
}
}
public override string ToString()
{
return string.Format(CultureInfo.CurrentCulture, "MappingSpanSnapshot anchored at {0}", _anchor);
}
}
}
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