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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.
//
// This file contain implementations details that are subject to change without notice.
// Use at your own risk.
//
namespace Microsoft.VisualStudio.Text.Implementation
{
using System;
using Microsoft.VisualStudio.Text.Projection;
internal partial class MappingPoint : IMappingPoint
{
SnapshotPoint anchorPoint;
PointTrackingMode trackingMode;
IBufferGraph bufferGraph;
public MappingPoint(SnapshotPoint anchorPoint, PointTrackingMode trackingMode, IBufferGraph bufferGraph)
{
if (anchorPoint.Snapshot == null)
{
throw new ArgumentNullException(nameof(anchorPoint));
}
if (trackingMode < PointTrackingMode.Positive || trackingMode > PointTrackingMode.Negative)
{
throw new ArgumentOutOfRangeException(nameof(trackingMode));
}
if (bufferGraph == null)
{
throw new ArgumentNullException(nameof(bufferGraph));
}
this.anchorPoint = anchorPoint;
this.trackingMode = trackingMode;
this.bufferGraph = bufferGraph;
}
public ITextBuffer AnchorBuffer
{
get { return this.anchorPoint.Snapshot.TextBuffer; }
}
public IBufferGraph BufferGraph
{
get { return this.bufferGraph; }
}
public SnapshotPoint? GetPoint(ITextBuffer targetBuffer, PositionAffinity affinity)
{
if (targetBuffer == null)
{
throw new ArgumentNullException(nameof(targetBuffer));
}
ITextBuffer anchorBuffer = this.AnchorBuffer;
SnapshotPoint currentPoint = this.anchorPoint.TranslateTo(anchorBuffer.CurrentSnapshot, this.trackingMode);
if (anchorBuffer == targetBuffer)
{
return currentPoint;
}
ITextBuffer topBuffer = this.bufferGraph.TopBuffer;
if (targetBuffer == topBuffer)
{
return this.bufferGraph.MapUpToBuffer(currentPoint, this.trackingMode, affinity, topBuffer);
}
else if (anchorBuffer == topBuffer)
{
return this.bufferGraph.MapDownToBuffer(currentPoint, this.trackingMode, targetBuffer, affinity);
}
else
{
// we don't know a priori which way to go, so we'll guess
if (anchorBuffer is IProjectionBufferBase)
{
SnapshotPoint? tentative = this.bufferGraph.MapDownToBuffer(currentPoint, this.trackingMode, targetBuffer, affinity);
if (tentative.HasValue)
{
return tentative;
}
}
// ok, go the other way
return this.bufferGraph.MapUpToBuffer(currentPoint, this.trackingMode, affinity, targetBuffer);
}
}
public SnapshotPoint? GetPoint(ITextSnapshot targetSnapshot, PositionAffinity affinity)
{
if (targetSnapshot == null)
throw new ArgumentNullException(nameof(targetSnapshot));
SnapshotPoint? result = GetPoint(targetSnapshot.TextBuffer, affinity);
if (result.HasValue && (result.Value.Snapshot != targetSnapshot))
{
result = result.Value.TranslateTo(targetSnapshot, this.trackingMode);
}
return result;
}
public SnapshotPoint? GetPoint(Predicate<ITextBuffer> match, PositionAffinity affinity)
{
if (match == null)
{
throw new ArgumentNullException(nameof(match));
}
ITextBuffer anchorBuffer = this.AnchorBuffer;
SnapshotPoint currentPoint = this.anchorPoint.TranslateTo(anchorBuffer.CurrentSnapshot, this.trackingMode);
if (match(anchorBuffer))
{
return currentPoint;
}
if (anchorBuffer == this.bufferGraph.TopBuffer)
{
// the only way to go is down
return this.bufferGraph.MapDownToFirstMatch(currentPoint, this.trackingMode, snapshot => (match(snapshot.TextBuffer)), affinity);
}
else
{
// guess which way to go
if (anchorBuffer is IProjectionBufferBase)
{
SnapshotPoint? tentative = this.bufferGraph.MapDownToFirstMatch(currentPoint, this.trackingMode, snapshot => (match(snapshot.TextBuffer)), affinity);
if (tentative.HasValue)
{
return tentative;
}
}
// go the other way.
if (match(this.bufferGraph.TopBuffer))
{
return this.bufferGraph.MapUpToBuffer(currentPoint, this.trackingMode, affinity, this.bufferGraph.TopBuffer);
}
else
{
return this.bufferGraph.MapUpToFirstMatch(currentPoint, this.trackingMode, snapshot => (match(snapshot.TextBuffer)), affinity);
}
}
}
public SnapshotPoint? GetInsertionPoint(Predicate<ITextBuffer> match)
{
// always maps down
if (match == null)
{
throw new ArgumentNullException(nameof(match));
}
ITextBuffer anchorBuffer = this.AnchorBuffer;
SnapshotPoint currentPoint = this.anchorPoint.TranslateTo(anchorBuffer.CurrentSnapshot, this.trackingMode);
return this.bufferGraph.MapDownToInsertionPoint(currentPoint, this.trackingMode, snapshot => (match(snapshot.TextBuffer)));
}
}
}
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