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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 Microsoft.VisualStudio.Text.Projection;
internal class MappingPointSnapshot : IMappingPoint
{
internal ITextSnapshot _root;
internal SnapshotPoint _anchor;
internal PointTrackingMode _trackingMode;
IBufferGraph _graph;
internal bool _unmappable = false;
public static IMappingPoint Create(ITextSnapshot root, SnapshotPoint anchor, PointTrackingMode trackingMode, IBufferGraph graph)
{
return new MappingPointSnapshot(root, anchor, trackingMode, graph);
}
private MappingPointSnapshot(ITextSnapshot root, SnapshotPoint anchor, PointTrackingMode 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 SnapshotPoint? GetPoint(ITextBuffer targetBuffer, PositionAffinity affinity)
{
if (targetBuffer == null)
throw new ArgumentNullException(nameof(targetBuffer));
if (_unmappable)
return null;
//Try mapping down first.
SnapshotPoint? mappedPoint = MappingHelper.MapDownToBufferNoTrack(_anchor, targetBuffer, affinity);
if (!mappedPoint.HasValue)
{
//Unable to map down ... try mapping up.
return this.MapUpToBufferNoTrack(targetBuffer, affinity);
}
return mappedPoint;
}
public SnapshotPoint? GetPoint(ITextSnapshot targetSnapshot, PositionAffinity affinity)
{
if (targetSnapshot == null)
throw new ArgumentNullException(nameof(targetSnapshot));
if (_unmappable)
return null;
SnapshotPoint? mappedPoint = this.GetPoint(targetSnapshot.TextBuffer, affinity);
if (mappedPoint.HasValue && (mappedPoint.Value.Snapshot != targetSnapshot))
{
mappedPoint = mappedPoint.Value.TranslateTo(targetSnapshot, _trackingMode);
}
return mappedPoint;
}
public SnapshotPoint? GetPoint(Predicate<ITextBuffer> match, PositionAffinity affinity)
{
if (match == null)
throw new ArgumentNullException(nameof(match));
if (_unmappable)
return null;
//Try mapping down first.
SnapshotPoint? mappedPoint = MappingHelper.MapDownToFirstMatchNoTrack(_anchor, match, affinity);
if (!mappedPoint.HasValue)
{
//Unable to map down ... try mapping up.
return this.MapUpToFirstMatchNoTrack(match, affinity);
}
return mappedPoint;
}
public SnapshotPoint? GetInsertionPoint(Predicate<ITextBuffer> match)
{
if (match == null)
throw new ArgumentNullException(nameof(match));
if (_unmappable)
return null;
return MappingHelper.MapDownToFirstMatchNoTrack(_anchor, match);
}
public ITextBuffer AnchorBuffer
{
get { return _anchor.Snapshot.TextBuffer; }
}
public IBufferGraph BufferGraph
{
get { return _graph; }
}
private SnapshotPoint? MapUpToBufferNoTrack(ITextBuffer targetBuffer, PositionAffinity affinity)
{
ITextSnapshot targetSnapshot = MappingHelper.FindCorrespondingSnapshot(_root, targetBuffer);
if (targetSnapshot != null)
{
//Map _anchor up to targetSnapshot (they should be concurrent snapshots)
return MapUpToSnapshotNoTrack(targetSnapshot, affinity);
}
return null;
}
private SnapshotPoint? MapUpToFirstMatchNoTrack(Predicate<ITextBuffer> match, PositionAffinity affinity)
{
ITextSnapshot targetSnapshot = MappingHelper.FindCorrespondingSnapshot(_root, match);
if (targetSnapshot != null)
{
//Map _anchor up to targetSnapshot (they should be concurrent snapshots)
return MapUpToSnapshotNoTrack(targetSnapshot, affinity);
}
return null;
}
private SnapshotPoint? MapUpToSnapshotNoTrack(ITextSnapshot targetSnapshot, PositionAffinity affinity)
{
return MapUpToSnapshotNoTrack(targetSnapshot, _anchor, affinity);
}
public static SnapshotPoint? MapUpToSnapshotNoTrack(ITextSnapshot targetSnapshot, SnapshotPoint anchor, PositionAffinity affinity)
{
if (anchor.Snapshot == targetSnapshot)
return anchor;
else
{
IProjectionSnapshot targetAsProjection = targetSnapshot as IProjectionSnapshot;
if (targetAsProjection != null)
{
var sourceSnapshots = targetAsProjection.SourceSnapshots;
for (int s = 0; s < sourceSnapshots.Count; ++s)
{
SnapshotPoint? downPoint = MapUpToSnapshotNoTrack(sourceSnapshots[s], anchor, affinity);
if (downPoint.HasValue)
{
SnapshotPoint? result = targetAsProjection.MapFromSourceSnapshot(downPoint.Value, affinity);
if (result.HasValue)
return result;
}
}
}
}
return null;
}
}
}
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