public static bool Analyze(SyntaxNodeAnalysisContext context, InvocationExpressionSyntax invocation)
{
var memberAccess = (MemberAccessExpressionSyntax)invocation.Expression;
ExpressionSyntax expression = memberAccess?.Expression;
if (expression?.IsKind(SyntaxKind.InvocationExpression) == true)
{
var invocation2 = (InvocationExpressionSyntax)expression;
ArgumentListSyntax argumentList = invocation2.ArgumentList;
if (argumentList?.IsMissing == false)
{
SeparatedSyntaxList <ArgumentSyntax> arguments = argumentList.Arguments;
if (arguments.Count == 1 &&
invocation2.Expression?.IsKind(SyntaxKind.SimpleMemberAccessExpression) == true)
{
var memberAccess2 = (MemberAccessExpressionSyntax)invocation2.Expression;
if (string.Equals(memberAccess2.Name?.Identifier.ValueText, "Where", StringComparison.Ordinal))
{
SemanticModel semanticModel = context.SemanticModel;
CancellationToken cancellationToken = context.CancellationToken;
if (SyntaxAnalyzer.IsEnumerableCastMethod(invocation, semanticModel, cancellationToken) &&
(SyntaxAnalyzer.IsEnumerableWhereMethod(invocation2, semanticModel, cancellationToken)))
{
BinaryExpressionSyntax isExpression = GetIsExpression(arguments.First().Expression);
if (isExpression != null)
{
var type = isExpression.Right as TypeSyntax;
if (type != null)
{
TypeSyntax type2 = GetTypeArgument(memberAccess.Name);
if (type2 != null)
{
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(type);
if (typeSymbol != null)
{
ITypeSymbol typeSymbol2 = semanticModel.GetTypeSymbol(type2);
if (typeSymbol.Equals(typeSymbol2))
{
TextSpan span = TextSpan.FromBounds(memberAccess2.Name.Span.Start, invocation.Span.End);
if (!invocation.ContainsDirectives(span))
{
context.ReportDiagnostic(
DiagnosticDescriptors.SimplifyLinqMethodChain,
Location.Create(invocation.SyntaxTree, span));
}
return(true);
}
}
}
}
}
}
}
}
}
}
return(false);
}