private void AnalyzeToken(
SemanticModelAnalysisContext context,
RegexPatternDetector detector,
SyntaxToken token,
CancellationToken cancellationToken
)
{
if (token.RawKind == _info.StringLiteralTokenKind)
{
var tree = detector.TryParseRegexPattern(
token,
context.SemanticModel,
cancellationToken
);
if (tree != null)
{
foreach (var diag in tree.Diagnostics)
{
context.ReportDiagnostic(
DiagnosticHelper.Create(
Descriptor,
Location.Create(context.SemanticModel.SyntaxTree, diag.Span),
ReportDiagnostic.Warn,
additionalLocations: null,
properties: null,
diag.Message
)
);
}
}
}
}
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 void Analyze(SemanticModelAnalysisContext context)
{
var semanticModel = context.SemanticModel;
var syntaxTree = semanticModel.SyntaxTree;
var cancellationToken = context.CancellationToken;
var options = context.Options;
var optionSet = options.GetDocumentOptionSetAsync(
semanticModel.SyntaxTree, cancellationToken).GetAwaiter().GetResult();
if (optionSet == null)
{
return;
}
var option = optionSet.GetOption(RegularExpressionsOptions.ReportInvalidRegexPatterns, syntaxTree.Options.Language);
if (!option)
{
return;
}
var detector = RegexPatternDetector.TryGetOrCreate(semanticModel, _info);
if (detector == null)
{
return;
}
// Use an actual stack object so that we don't blow the actual stack through recursion.
var root = syntaxTree.GetRoot(cancellationToken);
var stack = new Stack <SyntaxNode>();
stack.Push(root);
while (stack.Count != 0)
{
cancellationToken.ThrowIfCancellationRequested();
var current = stack.Pop();
foreach (var child in current.ChildNodesAndTokens())
{
if (child.IsNode)
{
stack.Push(child.AsNode());
}
else
{
AnalyzeToken(context, detector, child.AsToken(), cancellationToken);
}
}
}
}
