private static ImmutableArray <ParameterInfo> GetParameterInfos(
InvocationExpressionSyntax invocation,
IMethodSymbol methodSymbol)
{
bool isReduced = methodSymbol.MethodKind == MethodKind.ReducedExtension;
if (isReduced)
{
methodSymbol = methodSymbol.GetConstructedReducedFrom();
}
ImmutableArray <IParameterSymbol> parameters = methodSymbol.Parameters;
if (isReduced)
{
parameters = parameters.RemoveAt(0);
}
List <ParameterInfo> parameterInfos = null;
SeparatedSyntaxList <ArgumentSyntax> arguments = invocation.ArgumentList.Arguments;
foreach (ArgumentSyntax argument in arguments)
{
IParameterSymbol parameterSymbol = DetermineParameterHelper.DetermineParameter(argument, arguments, parameters);
if (parameterSymbol != null)
{
var parameterInfo = new ParameterInfo(parameterSymbol, argument.Expression);
(parameterInfos ?? (parameterInfos = new List <ParameterInfo>())).Add(parameterInfo);
}
else
{
return(default(ImmutableArray <ParameterInfo>));
}
}
foreach (IParameterSymbol parameterSymbol in parameters)
{
if (parameterInfos == null ||
parameterInfos.FindIndex(f =>
{
Debug.WriteLine(f.ParameterSymbol == parameterSymbol);
Debug.WriteLine(f.ParameterSymbol.Equals(parameterSymbol));
Debug.WriteLine(f.ParameterSymbol.Name == parameterSymbol.Name);
return(f.ParameterSymbol.Equals(parameterSymbol));
}) == -1)
{
if (parameterSymbol.HasExplicitDefaultValue)
{
var parameterInfo = new ParameterInfo(parameterSymbol, parameterSymbol.GetDefaultValueSyntax());
(parameterInfos ?? (parameterInfos = new List <ParameterInfo>())).Add(parameterInfo);
}
else
{
return(default(ImmutableArray <ParameterInfo>));
}
}
}
if (isReduced)
{
var memberAccess = (MemberAccessExpressionSyntax)invocation.Expression;
var parameterInfo = new ParameterInfo(methodSymbol.Parameters[0], memberAccess.Expression.TrimTrivia());
(parameterInfos ?? (parameterInfos = new List <ParameterInfo>())).Add(parameterInfo);
}
return((parameterInfos != null)
? parameterInfos.ToImmutableArray()
: ImmutableArray <ParameterInfo> .Empty);
}
