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.IsPossiblyPatternToken(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.IsPossiblyPatternToken(token, _info.SyntaxFacts))
{
return;
}
var detector = RegexPatternDetector.TryGetOrCreate(semanticModel.Compilation, _info);
var tree = detector?.TryParseRegexPattern(token, semanticModel, cancellationToken);
if (tree == null)
{
return;
}
var visitor = s_visitorPool.Allocate();
try
{
visitor.Result = result;
AddClassifications(tree.Root, visitor, result);
}
finally
{
visitor.Result = null;
s_visitorPool.Free(visitor);
}
}
