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using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Linq;
using System.Windows.Media;
using Microsoft.VisualStudio.ApplicationModel.Environments;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Classification;
using Microsoft.VisualStudio.Utilities;
namespace ClassifyAllBut
{
public static class TypeAndFormatExports
{
[Export(typeof(ClassificationTypeDefinition))]
[Name("strike-out")]
internal static ClassificationTypeDefinition StrikeOutType;
[Export(typeof(EditorFormatDefinition))]
[ClassificationType(ClassificationTypeNames = "strike-out")]
[Name("Strike-out")]
[DisplayName("Strike-out Text")]
[UserVisible(true)]
[Order(Before = Priority.High)]
internal sealed class StrikeOutFormat : ClassificationFormatDefinition
{
public StrikeOutFormat()
{
this.TextDecorations = System.Windows.TextDecorations.Strikethrough;
}
}
}
[Export(typeof(IClassifierProvider))]
[ContentType("CSharp")]
internal sealed class GrayedOutClassifierProvider : IClassifierProvider
{
[Import]
internal IClassificationTypeRegistryService TypeRegistry;
[Import]
internal IClassifierAggregatorService AggregatorService;
internal static bool ignoreRequest = false;
public IClassifier GetClassifier(ITextBuffer textBuffer, IEnvironment context)
{
if (ignoreRequest)
return null;
try
{
ignoreRequest = true;
return textBuffer.Properties.GetOrCreateSingletonProperty(
() => new GrayedOutClassifier(AggregatorService.GetClassifier(textBuffer, context), TypeRegistry));
}
finally
{
ignoreRequest = false;
}
}
}
internal sealed class GrayedOutClassifier : IClassifier
{
private IClassifier aggregator;
private IClassificationTypeRegistryService typeRegistry;
public GrayedOutClassifier(IClassifier aggregator, IClassificationTypeRegistryService typeRegistry)
{
this.aggregator = aggregator;
this.typeRegistry = typeRegistry;
}
public event EventHandler<ClassificationChangedEventArgs> ClassificationChanged;
public IList<ClassificationSpan> GetClassificationSpans(SnapshotSpan span)
{
var classifiedSpans = from cspan in aggregator.GetClassificationSpans(span)
let name = cspan.ClassificationType.Classification.ToLower()
where name.Contains("string") || name.Contains("comment") || name.Contains("xml doc")
select cspan.Span;
NormalizedSnapshotSpanCollection ignored = new NormalizedSnapshotSpanCollection(classifiedSpans);
NormalizedSnapshotSpanCollection request = new NormalizedSnapshotSpanCollection(span);
var spansToStrikeOut = NormalizedSnapshotSpanCollection.Difference(request, ignored);
IClassificationType type = typeRegistry.GetClassificationType("strike-out");
return spansToStrikeOut.Select(s => new ClassificationSpan(s, type))
.ToList();
}
}
}
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