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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 System.Collections.Generic;
using Microsoft.VisualStudio.Text.Projection;
using Microsoft.VisualStudio.Text.Utilities;
internal partial class MappingSpan : IMappingSpan
{
private SnapshotSpan anchorSpan;
private SpanTrackingMode trackingMode;
private IBufferGraph bufferGraph;
public MappingSpan(SnapshotSpan anchorSpan, SpanTrackingMode trackingMode, IBufferGraph bufferGraph)
{
if (anchorSpan.Snapshot == null)
{
throw new ArgumentNullException("anchorSpan");
}
if (trackingMode < SpanTrackingMode.EdgeExclusive || trackingMode > SpanTrackingMode.EdgeNegative)
{
throw new ArgumentOutOfRangeException("trackingMode");
}
if (bufferGraph == null)
{
throw new ArgumentNullException("bufferGraph");
}
this.anchorSpan = anchorSpan;
this.trackingMode = trackingMode;
this.bufferGraph = bufferGraph;
}
public IMappingPoint Start
{
get { return new MappingPoint(new SnapshotPoint(this.anchorSpan.Snapshot, this.anchorSpan.Start),
(this.trackingMode == SpanTrackingMode.EdgeInclusive ||
this.trackingMode == SpanTrackingMode.EdgeNegative)
? PointTrackingMode.Negative
: PointTrackingMode.Positive,
this.bufferGraph); }
}
public IMappingPoint End
{
get { return new MappingPoint(new SnapshotPoint(this.anchorSpan.Snapshot, this.anchorSpan.End),
(this.trackingMode == SpanTrackingMode.EdgeExclusive ||
this.trackingMode == SpanTrackingMode.EdgeNegative)
? PointTrackingMode.Negative
: PointTrackingMode.Positive,
this.bufferGraph);
}
}
public ITextBuffer AnchorBuffer
{
get { return this.anchorSpan.Snapshot.TextBuffer; }
}
public IBufferGraph BufferGraph
{
get { return this.bufferGraph; }
}
public NormalizedSnapshotSpanCollection GetSpans(ITextBuffer targetBuffer)
{
// null textBuffer check will be handled by the buffer graph
ITextBuffer anchorBuffer = this.AnchorBuffer;
SnapshotSpan currentSpan = this.anchorSpan.TranslateTo(anchorBuffer.CurrentSnapshot, this.trackingMode);
if (anchorBuffer == targetBuffer)
{
return new NormalizedSnapshotSpanCollection(currentSpan);
}
ITextBuffer topBuffer = this.bufferGraph.TopBuffer;
if (targetBuffer == topBuffer)
{
return this.bufferGraph.MapUpToBuffer(currentSpan, this.trackingMode, topBuffer);
}
else if (anchorBuffer == topBuffer)
{
return this.bufferGraph.MapDownToBuffer(currentSpan, this.trackingMode, targetBuffer);
}
else
{
if (anchorBuffer is IProjectionBufferBase)
{
NormalizedSnapshotSpanCollection tentative = this.bufferGraph.MapDownToBuffer(currentSpan, this.trackingMode, targetBuffer);
if (tentative.Count > 0)
{
return tentative;
}
}
return this.bufferGraph.MapUpToBuffer(currentSpan, this.trackingMode, targetBuffer);
}
}
public NormalizedSnapshotSpanCollection GetSpans(ITextSnapshot targetSnapshot)
{
if (targetSnapshot == null)
throw new ArgumentNullException("targetSnapshot");
NormalizedSnapshotSpanCollection results = 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 (match == null)
{
throw new ArgumentNullException("match");
}
ITextBuffer anchorBuffer = this.AnchorBuffer;
SnapshotSpan currentSpan = this.anchorSpan.TranslateTo(anchorBuffer.CurrentSnapshot, this.trackingMode);
if (match(anchorBuffer))
{
return new NormalizedSnapshotSpanCollection(currentSpan);
}
if (anchorBuffer == this.bufferGraph.TopBuffer)
{
return this.bufferGraph.MapDownToFirstMatch(currentSpan, this.trackingMode, snapshot => (match(snapshot.TextBuffer)));
}
else
{
// guess which way to go
if (anchorBuffer is IProjectionBufferBase)
{
NormalizedSnapshotSpanCollection tentative = this.bufferGraph.MapDownToFirstMatch(currentSpan, this.trackingMode, snapshot => (match(snapshot.TextBuffer)));
if (tentative.Count > 0)
{
return tentative;
}
}
return this.bufferGraph.MapUpToFirstMatch(currentSpan, this.trackingMode, snapshot => (match(snapshot.TextBuffer)));
}
}
public override string ToString()
{
return String.Format("MappingSpan anchored at {0}", this.anchorSpan);
}
}
}
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