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);
}
public static void Analyze(
SyntaxNodeAnalysisContext context,
InvocationExpressionSyntax invocation,
MemberAccessExpressionSyntax memberAccess)
{
if (memberAccess.Expression?.IsKind(SyntaxKind.InvocationExpression) == true)
{
var invocation2 = (InvocationExpressionSyntax)memberAccess.Expression;
if (invocation2.ArgumentList?.Arguments.Count == 1 &&
invocation2.Expression?.IsKind(SyntaxKind.SimpleMemberAccessExpression) == true)
{
var memberAccess2 = (MemberAccessExpressionSyntax)invocation2.Expression;
SemanticModel semanticModel = context.SemanticModel;
CancellationToken cancellationToken = context.CancellationToken;
if (string.Equals(memberAccess2.Name?.Identifier.ValueText, "Where", StringComparison.Ordinal))
{
IMethodSymbol methodSymbol = semanticModel.GetMethodSymbol(invocation2, cancellationToken);
if (methodSymbol != null)
{
IMethodSymbol reducedFrom = methodSymbol.ReducedFrom;
if (reducedFrom?.Name.Equals("Where", StringComparison.Ordinal) == true)
{
ImmutableArray <IParameterSymbol> parameters = methodSymbol.Parameters;
if (parameters.Length == 1 &&
SyntaxAnalyzer.IsContainedInEnumerable(reducedFrom, semanticModel) &&
SyntaxAnalyzer.IsGenericIEnumerable(reducedFrom.Parameters.First().Type))
{
if (SyntaxAnalyzer.IsPredicateFunc(
parameters[0].Type,
methodSymbol.TypeArguments[0],
semanticModel))
{
if (SyntaxAnalyzer.IsEnumerableWhereMethod(invocation, semanticModel, cancellationToken))
{
Analyze(context, invocation, invocation2, memberAccess, memberAccess2);
}
}
else if (SyntaxAnalyzer.IsPredicateFunc(
parameters[0].Type,
methodSymbol.TypeArguments[0],
semanticModel.Compilation.GetSpecialType(SpecialType.System_Int32),
semanticModel))
{
if (SyntaxAnalyzer.IsEnumerableWhereMethodWithIndex(invocation, semanticModel, cancellationToken))
{
Analyze(context, invocation, invocation2, memberAccess, memberAccess2);
}
}
}
}
}
}
}
}
}