internal async Task <(RegexTree tree, SyntaxToken token)> TryGetTreeAndTokenAtPositionAsync(
Document document, int position, CancellationToken cancellationToken)
{
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var token = root.FindToken(position);
var syntaxFacts = document.GetLanguageService <ISyntaxFactsService>();
if (RegexPatternDetector.IsDefinitelyNotPattern(token, syntaxFacts))
{
return(default);
public override void AddClassifications(
Workspace workspace, SyntaxToken token, SemanticModel semanticModel,
ArrayBuilder <ClassifiedSpan> result, CancellationToken cancellationToken)
{
if (_info.StringLiteralTokenKind != token.RawKind)
{
return;
}
if (!workspace.Options.GetOption(RegularExpressionsOptions.ColorizeRegexPatterns, semanticModel.Language))
{
return;
}
// Do some quick syntactic checks before doing any complex work.
if (RegexPatternDetector.IsDefinitelyNotPattern(token, _info.SyntaxFacts))
{
return;
}
var detector = RegexPatternDetector.TryGetOrCreate(semanticModel, _info);
var tree = detector?.TryParseRegexPattern(token, cancellationToken);
if (tree == null)
{
return;
}
var visitor = _visitorPool.Allocate();
try
{
visitor.Result = result;
AddClassifications(tree.Root, visitor, result);
}
finally
{
visitor.Result = null;
_visitorPool.Free(visitor);
}
}