/// <summary>
/// Gets all candidate extension methods.
/// Note: this includes candidates that are not eligible due to an inapplicable
/// this argument.
/// The candidates will only be specialized if the type arguments were provided explicitly.
/// </summary>
/// <remarks>
/// The results are stored in nested lists because they are grouped by using scope.
/// That is, for "using SomeExtensions; namespace X { using MoreExtensions; ... }",
/// the return value will be
/// new List {
/// new List { all extensions from MoreExtensions },
/// new List { all extensions from SomeExtensions }
/// }
/// </remarks>
public IEnumerable<IEnumerable<IMethod>> GetExtensionMethods()
{
if (resolver != null)
{
Debug.Assert(extensionMethods == null);
try
{
extensionMethods = resolver.GetExtensionMethods(methodName, typeArguments);
}
finally
{
resolver = null;
}
}
return extensionMethods ?? Enumerable.Empty<IEnumerable<IMethod>>();
}
public Expression ResolveMemberAccess(ResolveContext rc, VSC.AST.Expression target, string identifier, IList <IType> typeArguments, NameLookupMode lookupMode = NameLookupMode.Expression)
{
// V# 4.0 spec: §7.6.4
bool parameterizeResultType = !(typeArguments.Count != 0 && typeArguments.All(t => t.Kind == TypeKind.UnboundTypeArgument));
AliasNamespace nrr = target as AliasNamespace;
if (nrr != null)
{
return(ResolveMemberAccessOnNamespace(nrr, identifier, typeArguments, parameterizeResultType));
}
// TODO:Dynamic Resolution
//if (target.Type.Kind == TypeKind.Dynamic)
// return new DynamicMemberResolveResult(target, identifier);
MemberLookup lookup = rc.CreateMemberLookup(lookupMode);
Expression result;
switch (lookupMode)
{
case NameLookupMode.Expression:
result = lookup.Lookup(target, identifier, typeArguments, isInvocation: false);
break;
case NameLookupMode.InvocationTarget:
result = lookup.Lookup(target, identifier, typeArguments, isInvocation: true);
break;
case NameLookupMode.Type:
case NameLookupMode.TypeInUsingDeclaration:
case NameLookupMode.BaseTypeReference:
// Don't do the UnknownMemberResolveResult/MethodGroupResolveResult processing,
// it's only relevant for expressions.
return(lookup.LookupType(target.Type, identifier, typeArguments, parameterizeResultType));
default:
throw new NotSupportedException("Invalid value for NameLookupMode");
}
if (result is UnknownMemberExpression)
{
// We intentionally use all extension methods here, not just the eligible ones.
// Proper eligibility checking is only possible for the full invocation
// (after we know the remaining arguments).
// The eligibility check in GetExtensionMethods is only intended for code completion.
var extensionMethods = rc.GetExtensionMethods(identifier, typeArguments);
if (extensionMethods.Count > 0)
{
return(new MethodGroupExpression(target, identifier, EmptyList <MethodListWithDeclaringType> .Instance, typeArguments)
{
extensionMethods = extensionMethods
});
}
}
else
{
MethodGroupExpression mgrr = result as MethodGroupExpression;
if (mgrr != null)
{
Debug.Assert(mgrr.extensionMethods == null);
// set the values that are necessary to make MethodGroupResolveResult.GetExtensionMethods() work
mgrr.resolver = rc;
}
}
return(result);
}
