public static bool Applicable(SemanticModel semanticModel, ArgumentSyntax argument, IEnumerable <ParameterSyntax> parameters)
{
var method = argument.AncestorAndSelf <BaseMethodDeclarationSyntax>();
if (method == null ||
method.Body == null)
{
return(false);
}
if (argument.RefOrOutKeyword.Kind() == SyntaxKind.RefKeyword)
{
return(true);
}
Debug.Assert(argument.RefOrOutKeyword.Kind() == SyntaxKind.OutKeyword);
var symbolInfo = semanticModel.GetSymbolInfo(argument.Expression);
if (!(symbolInfo.Symbol != null && symbolInfo.Symbol.Kind == SymbolKind.Local))
{
return(true);
}
// for local, make sure it is definitely assigned before removing "out" keyword
var invocation = argument.AncestorAndSelf <InvocationExpressionSyntax>();
if (invocation == null)
{
return(false);
}
var range = GetStatementRangeForFlowAnalysis <StatementSyntax>(method.Body, TextSpan.FromBounds(method.Body.OpenBraceToken.Span.End, invocation.Span.Start));
var dataFlow = semanticModel.AnalyzeDataFlow(range.Item1, range.Item2);
foreach (var symbol in dataFlow.AlwaysAssigned)
{
if (symbolInfo.Symbol == symbol)
{
return(true);
}
}
return(false);
}
