internal async Task <ExcerptResultInternal?> TryGetExcerptInternalAsync(
Document document,
TextSpan span,
ExcerptModeInternal mode,
SourceText razorDocumentText,
LinePositionSpan mappedLinePosition,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
var razorDocumentSpan = razorDocumentText.Lines.GetTextSpan(mappedLinePosition);
var generatedDocument = document;
// First compute the range of text we want to we to display relative to the razor document.
var excerptSpan = ChooseExcerptSpan(razorDocumentText, razorDocumentSpan, mode);
// Then we'll classify the spans based on the razor document, since that's the coordinate
// space that our output mappings use.
var classifiedSpans = await ClassifyPreviewAsync(
razorDocumentSpan,
excerptSpan,
span,
generatedDocument,
options,
cancellationToken).ConfigureAwait(false);
var excerptText = GetTranslatedExcerptText(razorDocumentText, ref razorDocumentSpan, ref excerptSpan, classifiedSpans);
return(new ExcerptResultInternal(excerptText, razorDocumentSpan, classifiedSpans.ToImmutable(), document, span));
}
public async Task <RazorExcerptResult?> TryExcerptAsync(
Document document,
TextSpan span,
RazorExcerptMode mode,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
var result = await TryGetExcerptInternalAsync(document, span, (ExcerptModeInternal)mode, options, cancellationToken).ConfigureAwait(false);
return(result?.ToExcerptResult());
}
internal override async Task <ExcerptResultInternal?> TryGetExcerptInternalAsync(
Document document,
TextSpan span,
ExcerptModeInternal mode,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
if (_document is null)
{
return(null);
}
var mappedSpans = await _mappingService.MapSpansAsync(document, new[] { span }, cancellationToken).ConfigureAwait(false);
if (mappedSpans.Length == 0 || mappedSpans[0].Equals(default(RazorMappedSpanResult)))
{
return(null);
}
var project = _document.Project;
var razorDocument = project.GetDocument(mappedSpans[0].FilePath);
if (razorDocument is null)
{
return(null);
}
var razorDocumentText = await razorDocument.GetTextAsync().ConfigureAwait(false);
var razorDocumentSpan = razorDocumentText.Lines.GetTextSpan(mappedSpans[0].LinePositionSpan);
var generatedDocument = document;
// First compute the range of text we want to we to display relative to the primary document.
var excerptSpan = ChooseExcerptSpan(razorDocumentText, razorDocumentSpan, mode);
// Then we'll classify the spans based on the primary document, since that's the coordinate
// space that our output mappings use.
var output = await _document.GetGeneratedOutputAsync().ConfigureAwait(false);
var mappings = output.GetCSharpDocument().SourceMappings;
var classifiedSpans = await ClassifyPreviewAsync(
excerptSpan,
generatedDocument,
mappings,
options,
cancellationToken).ConfigureAwait(false);
var excerptText = GetTranslatedExcerptText(razorDocumentText, ref razorDocumentSpan, ref excerptSpan, classifiedSpans);
return(new ExcerptResultInternal(excerptText, razorDocumentSpan, classifiedSpans.ToImmutable(), document, span));
}
internal override async Task <ExcerptResultInternal?> TryGetExcerptInternalAsync(
Document document,
TextSpan span,
ExcerptModeInternal mode,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
var mappedSpans = await _mappingService.MapSpansAsync(document, new[] { span }, cancellationToken).ConfigureAwait(false);
if (mappedSpans.Length == 0 || mappedSpans[0].Equals(default(RazorMappedSpanResult)))
{
return(null);
}
return(await TryGetExcerptInternalAsync(
document,
span,
mode,
_documentSnapshot.Snapshot.AsText(),
mappedSpans[0].LinePositionSpan,
options,
cancellationToken).ConfigureAwait(false));
}
private async Task <ImmutableArray <ClassifiedSpan> .Builder> ClassifyPreviewAsync(
TextSpan razorSpan,
TextSpan excerptSpan,
TextSpan generatedSpan,
Document generatedDocument,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
var builder = ImmutableArray.CreateBuilder <ClassifiedSpan>();
var remainingSpan = excerptSpan;
// We should be able to process this whole span as C#, so classify it.
//
// However, we'll have to translate it to the the generated document's coordinates to do that.
var offsetRazorToGenerated = generatedSpan.Start - razorSpan.Start;
var offsetExcerpt = new TextSpan(excerptSpan.Start + offsetRazorToGenerated, excerptSpan.Length);
var classifiedSecondarySpans = await RazorClassifierAccessor.GetClassifiedSpansAsync(
generatedDocument,
offsetExcerpt,
options,
cancellationToken);
// Now we have to translate back to the razor document's coordinates.
var offsetGeneratedToRazor = razorSpan.Start - generatedSpan.Start;
foreach (var classifiedSecondarySpan in classifiedSecondarySpans)
{
// Ensure classified span is contained within our excerpt
// Possible for FirstSpan.start & LastSpan.end to be out of range of the excerpt, but still intersecting
if (classifiedSecondarySpan.TextSpan.Start + offsetGeneratedToRazor < excerptSpan.Start ||
classifiedSecondarySpan.TextSpan.End + offsetGeneratedToRazor > excerptSpan.End)
{
continue;
}
var updated = new TextSpan(classifiedSecondarySpan.TextSpan.Start + offsetGeneratedToRazor, classifiedSecondarySpan.TextSpan.Length);
// NOTE: The Classifier will only return spans for things that it understands. That means
// that whitespace is not classified. The preview expects us to provide contiguous spans,
// so we are going to have to fill in the gaps.
if (remainingSpan.Start < updated.Start)
{
builder.Add(new ClassifiedSpan(
ClassificationTypeNames.Text,
new TextSpan(remainingSpan.Start, updated.Start - remainingSpan.Start)));
remainingSpan = new TextSpan(updated.Start, remainingSpan.Length - (updated.Start - remainingSpan.Start));
}
builder.Add(new ClassifiedSpan(classifiedSecondarySpan.ClassificationType, updated));
remainingSpan = new TextSpan(updated.End, Math.Max(0, remainingSpan.Length - (updated.End - remainingSpan.Start)));
}
// Make sure that we're not introducing a gap. Remember, we need to fill in the whitespace.
if (remainingSpan.Start < razorSpan.End)
{
builder.Add(new ClassifiedSpan(
ClassificationTypeNames.Text,
new TextSpan(remainingSpan.Start, razorSpan.End - remainingSpan.Start)));
remainingSpan = new TextSpan(razorSpan.End, remainingSpan.Length - (razorSpan.End - remainingSpan.Start));
}
// Deal with residue
if (remainingSpan.Length > 0)
{
// Trailing Razor/markup text.
builder.Add(new ClassifiedSpan(ClassificationTypeNames.Text, remainingSpan));
}
return(builder);
}
internal abstract Task <ExcerptResultInternal?> TryGetExcerptInternalAsync(
Document document,
TextSpan span,
ExcerptModeInternal mode,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken);
private async Task <ImmutableArray <ClassifiedSpan> .Builder> ClassifyPreviewAsync(
TextSpan excerptSpan,
Document generatedDocument,
IReadOnlyList <SourceMapping> mappings,
RazorClassificationOptionsWrapper options,
CancellationToken cancellationToken)
{
var builder = ImmutableArray.CreateBuilder <ClassifiedSpan>();
var sorted = new List <SourceMapping>(mappings);
sorted.Sort((x, y) => x.OriginalSpan.AbsoluteIndex.CompareTo(y.OriginalSpan.AbsoluteIndex));
// The algorithm here is to iterate through the source mappings (sorted) and use the C# classifier
// on the spans that are known to be C#. For the spans that are not known to be C# then
// we just treat them as text since we'd don't currently have our own classifications.
var remainingSpan = excerptSpan;
for (var i = 0; i < sorted.Count && excerptSpan.Length > 0; i++)
{
var primarySpan = sorted[i].OriginalSpan.AsTextSpan();
var intersection = primarySpan.Intersection(remainingSpan);
if (intersection is null)
{
// This span is outside the area we're interested in.
continue;
}
// OK this span intersects with the excerpt span, so we will process it. Let's compute
// the secondary span that matches the intersection.
var secondarySpan = sorted[i].GeneratedSpan.AsTextSpan();
secondarySpan = new TextSpan(secondarySpan.Start + intersection.Value.Start - primarySpan.Start, intersection.Value.Length);
primarySpan = intersection.Value;
if (remainingSpan.Start < primarySpan.Start)
{
// The position is before the next C# span. Classify everything up to the C# start
// as text.
builder.Add(new ClassifiedSpan(ClassificationTypeNames.Text, new TextSpan(remainingSpan.Start, primarySpan.Start - remainingSpan.Start)));
// Advance to the start of the C# span.
remainingSpan = new TextSpan(primarySpan.Start, remainingSpan.Length - (primarySpan.Start - remainingSpan.Start));
}
// We should be able to process this whole span as C#, so classify it.
//
// However, we'll have to translate it to the the generated document's coordinates to do that.
Debug.Assert(remainingSpan.Contains(primarySpan) && remainingSpan.Start == primarySpan.Start);
var classifiedSecondarySpans = await RazorClassifierAccessor.GetClassifiedSpansAsync(
generatedDocument,
secondarySpan,
options,
cancellationToken);
// NOTE: The Classifier will only returns spans for things that it understands. That means
// that whitespace is not classified. The preview expects us to provide contiguous spans,
// so we are going to have to fill in the gaps.
// Now we have to translate back to the primary document's coordinates.
var offset = primarySpan.Start - secondarySpan.Start;
foreach (var classifiedSecondarySpan in classifiedSecondarySpans)
{
Debug.Assert(secondarySpan.Contains(classifiedSecondarySpan.TextSpan));
var updated = new TextSpan(classifiedSecondarySpan.TextSpan.Start + offset, classifiedSecondarySpan.TextSpan.Length);
Debug.Assert(primarySpan.Contains(updated));
// Make sure that we're not introducing a gap. Remember, we need to fill in the whitespace.
if (remainingSpan.Start < updated.Start)
{
builder.Add(new ClassifiedSpan(
ClassificationTypeNames.Text,
new TextSpan(remainingSpan.Start, updated.Start - remainingSpan.Start)));
remainingSpan = new TextSpan(updated.Start, remainingSpan.Length - (updated.Start - remainingSpan.Start));
}
builder.Add(new ClassifiedSpan(classifiedSecondarySpan.ClassificationType, updated));
remainingSpan = new TextSpan(updated.End, remainingSpan.Length - (updated.End - remainingSpan.Start));
}
// Make sure that we're not introducing a gap. Remember, we need to fill in the whitespace.
if (remainingSpan.Start < primarySpan.End)
{
builder.Add(new ClassifiedSpan(
ClassificationTypeNames.Text,
new TextSpan(remainingSpan.Start, primarySpan.End - remainingSpan.Start)));
remainingSpan = new TextSpan(primarySpan.End, remainingSpan.Length - (primarySpan.End - remainingSpan.Start));
}
}
// Deal with residue
if (remainingSpan.Length > 0)
{
// Trailing Razor/markup text.
builder.Add(new ClassifiedSpan(ClassificationTypeNames.Text, remainingSpan));
}
return(builder);
}