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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.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Diagnostics;
namespace Microsoft.VisualStudio.Text.Differencing.Implementation
{
// Ignore deprecated (IHierarchicalStringDifferenceService is deprecated)
#pragma warning disable 0618
[Export(typeof(IHierarchicalStringDifferenceService))]
internal sealed class DefaultTextDifferencingService : ITextDifferencingService, IHierarchicalStringDifferenceService
{
#region ITextDifferencingService-specific
public IHierarchicalDifferenceCollection DiffSnapshotSpans(SnapshotSpan leftSpan, SnapshotSpan rightSpan, StringDifferenceOptions differenceOptions)
{
return this.DiffSnapshotSpans(leftSpan, rightSpan, differenceOptions, DefaultGetLineTextCallback);
}
public IHierarchicalDifferenceCollection DiffSnapshotSpans(SnapshotSpan leftSpan, SnapshotSpan rightSpan, StringDifferenceOptions differenceOptions, Func<ITextSnapshotLine, string> getLineTextCallback)
{
StringDifferenceTypes type;
ITokenizedStringListInternal left;
ITokenizedStringListInternal right;
if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Line))
{
type = StringDifferenceTypes.Line;
left = new SnapshotLineList(leftSpan, getLineTextCallback, differenceOptions);
right = new SnapshotLineList(rightSpan, getLineTextCallback, differenceOptions);
}
else if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Word))
{
type = StringDifferenceTypes.Word;
left = new WordDecompositionList(leftSpan, differenceOptions);
right = new WordDecompositionList(rightSpan, differenceOptions);
}
else if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Character))
{
type = StringDifferenceTypes.Character;
left = new CharacterDecompositionList(leftSpan);
right = new CharacterDecompositionList(rightSpan);
}
else
{
throw new ArgumentOutOfRangeException(nameof(differenceOptions));
}
return DiffText(left, right, type, differenceOptions);
}
public IHierarchicalDifferenceCollection DiffStrings(string leftString, string rightString, StringDifferenceOptions differenceOptions)
{
if (leftString == null)
throw new ArgumentNullException(nameof(leftString));
if (rightString == null)
throw new ArgumentNullException(nameof(rightString));
StringDifferenceTypes type;
ITokenizedStringListInternal left;
ITokenizedStringListInternal right;
if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Line))
{
type = StringDifferenceTypes.Line;
left = new LineDecompositionList(leftString, differenceOptions.IgnoreTrimWhiteSpace);
right = new LineDecompositionList(rightString, differenceOptions.IgnoreTrimWhiteSpace);
}
else if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Word))
{
type = StringDifferenceTypes.Word;
left = new WordDecompositionList(leftString, differenceOptions);
right = new WordDecompositionList(rightString, differenceOptions);
}
else if (differenceOptions.DifferenceType.HasFlag(StringDifferenceTypes.Character))
{
type = StringDifferenceTypes.Character;
left = new CharacterDecompositionList(leftString);
right = new CharacterDecompositionList(rightString);
}
else
{
throw new ArgumentOutOfRangeException(nameof(differenceOptions));
}
return DiffText(left, right, type, differenceOptions);
}
IHierarchicalDifferenceCollection DiffText(ITokenizedStringListInternal left, ITokenizedStringListInternal right, StringDifferenceTypes type, StringDifferenceOptions differenceOptions)
{
StringDifferenceOptions nextOptions = new StringDifferenceOptions(differenceOptions);
nextOptions.DifferenceType &= ~type;
var diffCollection = ComputeMatches(differenceOptions, left, right);
return new HierarchicalDifferenceCollection(diffCollection, left, right, this, nextOptions);
}
internal static List<Span> GetContiguousSpans(Span span, ITokenizedStringListInternal tokens)
{
List<Span> result = new List<Span>();
int start = span.Start;
for (int i = span.Start + 1; (i < span.End); ++i)
{
if (tokens.GetElementInOriginal(i - 1).End != tokens.GetElementInOriginal(i).Start)
{
result.Add(Span.FromBounds(start, i));
start = i;
}
}
if (start < span.End)
{
result.Add(Span.FromBounds(start, span.End));
}
return result;
}
internal static string DefaultGetLineTextCallback(ITextSnapshotLine line)
{
return line.GetTextIncludingLineBreak();
}
static IDifferenceCollection<string> ComputeMatches(StringDifferenceOptions differenceOptions,
IList<string> leftSequence, IList<string> rightSequence)
{
return ComputeMatches(differenceOptions, leftSequence, rightSequence, leftSequence, rightSequence);
}
static IDifferenceCollection<string> ComputeMatches(StringDifferenceOptions differenceOptions,
IList<string> leftSequence, IList<string> rightSequence,
IList<string> originalLeftSequence, IList<string> originalRightSequence)
{
return MaximalSubsequenceAlgorithm.DifferenceSequences(leftSequence, rightSequence, originalLeftSequence, originalRightSequence, differenceOptions.ContinueProcessingPredicate);
}
#endregion
}
#pragma warning restore 0618
}
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