private async Task <Document> ReplaceWithIsPattern(Document document, ExpressionSyntax expression, CancellationToken cancellationToken)
{
if (IfRecognizer.UsesEqualsForNullCheck(expression, out var otherIndentifer))
{
var newSyntax = SyntaxFactory.IsPatternExpression(otherIndentifer,
SyntaxFactory.ConstantPattern(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression))
);
var root = await document.GetSyntaxRootAsync();
return(document.WithSyntaxRoot(root.ReplaceNode(expression, newSyntax)));
}
return(document);
}
private void AnalyzeOperation(OperationAnalysisContext context)
{
if (context.Operation is IConditionalOperation conditionalOperation &&
conditionalOperation.Condition != null)
{
if (conditionalOperation.Condition.Syntax is ExpressionSyntax expression &&
IfRecognizer.UsesEqualsForNullCheck(expression, out var otherIndentifer))
{
var diagnostic = Diagnostic.Create(IsNullRule, expression.GetLocation(), otherIndentifer.Identifier.ValueText);
context.ReportDiagnostic(diagnostic);
}
}
}