public async Task <ImmutableArray <TextChange> > GetTextChangesAsync(
Document oldDocument,
Document newDocument,
TextDifferenceTypes preferredDifferenceType,
CancellationToken cancellationToken
)
{
var changes = await newDocument
.GetTextChangesAsync(oldDocument, cancellationToken)
.ConfigureAwait(false);
return(changes.ToImmutableArray());
}
private StringDifferenceOptions GetDifferenceOptions(TextDifferenceTypes differenceTypes)
{
StringDifferenceTypes stringDifferenceTypes = default;
if (differenceTypes.HasFlag(TextDifferenceTypes.Line))
{
stringDifferenceTypes |= StringDifferenceTypes.Line;
}
if (differenceTypes.HasFlag(TextDifferenceTypes.Word))
{
stringDifferenceTypes |= StringDifferenceTypes.Word;
}
if (differenceTypes.HasFlag(TextDifferenceTypes.Character))
{
stringDifferenceTypes |= StringDifferenceTypes.Character;
}
return(new StringDifferenceOptions()
{
DifferenceType = stringDifferenceTypes
});
}
public async Task <ImmutableArray <TextChange> > GetTextChangesAsync(Document oldDocument, Document newDocument, TextDifferenceTypes preferredDifferenceType, CancellationToken cancellationToken)
{
var oldText = await oldDocument.GetTextAsync(cancellationToken).ConfigureAwait(false);
var newText = await newDocument.GetTextAsync(cancellationToken).ConfigureAwait(false);
var diffService = _differenceSelectorService.GetTextDifferencingService(oldDocument.Project.LanguageServices.GetService <IContentTypeLanguageService>().GetDefaultContentType())
?? _differenceSelectorService.DefaultTextDifferencingService;
var differenceOptions = GetDifferenceOptions(preferredDifferenceType);
var oldTextSnapshot = oldText.FindCorrespondingEditorTextSnapshot();
var newTextSnapshot = newText.FindCorrespondingEditorTextSnapshot();
var useSnapshots = oldTextSnapshot != null && newTextSnapshot != null;
var diffResult = useSnapshots
? diffService.DiffSnapshotSpans(oldTextSnapshot.GetFullSpan(), newTextSnapshot.GetFullSpan(), differenceOptions)
: diffService.DiffStrings(oldText.ToString(), newText.ToString(), differenceOptions);
return(diffResult.Differences.Select(d =>
new TextChange(
diffResult.LeftDecomposition.GetSpanInOriginal(d.Left).ToTextSpan(),
newText.GetSubText(diffResult.RightDecomposition.GetSpanInOriginal(d.Right).ToTextSpan()).ToString())).ToImmutableArray());
}
