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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.Projection.Implementation
{
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using Microsoft.VisualStudio.Text.Differencing;
using Microsoft.VisualStudio.Text.Implementation;
using Microsoft.VisualStudio.Text.Utilities;
internal class ProjectionSpanToNormalizedChangeConverter
{
private INormalizedTextChangeCollection normalizedChanges;
private bool computed = false;
private int textPosition;
private ProjectionSpanDiffer differ;
private ITextSnapshot currentSnapshot;
public ProjectionSpanToNormalizedChangeConverter(ProjectionSpanDiffer differ,
int textPosition,
ITextSnapshot currentSnapshot)
{
this.differ = differ;
this.textPosition = textPosition;
this.currentSnapshot = currentSnapshot;
}
public INormalizedTextChangeCollection NormalizedChanges
{
get
{
if (!computed)
{
ConstructChanges();
computed = true;
}
return this.normalizedChanges;
}
}
#region Private helpers
private void ConstructChanges()
{
var diffs = differ.GetDifferences();
List<TextChange> changes = new List<TextChange>();
int pos = this.textPosition;
// each difference generates a text change
foreach (Difference diff in diffs)
{
pos += GetMatchSize(diffs.LeftSequence, diff.Before);
TextChange change = TextChange.Create(pos,
BufferFactoryService.StringRebuilderFromSnapshotSpans(diffs.LeftSequence, diff.Left),
BufferFactoryService.StringRebuilderFromSnapshotSpans(diffs.RightSequence, diff.Right),
this.currentSnapshot);
changes.Add(change);
pos += change.OldLength;
}
this.normalizedChanges = NormalizedTextChangeCollection.Create(changes);
}
private static int GetMatchSize(IList<SnapshotSpan> spans, Match match)
{
int size = 0;
if (match != null)
{
Span extent = match.Left;
for (int s = extent.Start; s < extent.End; ++s)
{
size += spans[s].Length;
}
}
return size;
}
#endregion
}
}
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