ResolveResult CreateResult(ResolveResult targetResolveResult, List <LookupGroup> lookupGroups, string name, IList <IType> typeArguments)
{
// Remove all hidden groups
lookupGroups.RemoveAll(g => g.AllHidden);
if (lookupGroups.Count == 0)
{
// No members found
return(new UnknownMemberResolveResult(targetResolveResult.Type, name, typeArguments));
}
if (lookupGroups.Any(g => !g.MethodsAreHidden && g.Methods.Count > 0))
{
// If there are methods, make a MethodGroupResolveResult.
// Note that a conflict between a member and a method (possible with multiple interface inheritance)
// is only a warning, not an error, and the C# compiler will prefer the method group.
List <MethodListWithDeclaringType> methodLists = new List <MethodListWithDeclaringType>();
foreach (var lookupGroup in lookupGroups)
{
if (!lookupGroup.MethodsAreHidden && lookupGroup.Methods.Count > 0)
{
var methodListWithDeclType = new MethodListWithDeclaringType(lookupGroup.DeclaringType);
foreach (var method in lookupGroup.Methods)
{
methodListWithDeclType.Add((IMethod)method);
}
methodLists.Add(methodListWithDeclType);
}
}
return(new MethodGroupResolveResult(targetResolveResult, name, methodLists, typeArguments));
}
// If there are ambiguities, report the most-derived result (last group)
LookupGroup resultGroup = lookupGroups[lookupGroups.Count - 1];
if (resultGroup.NestedTypes != null && resultGroup.NestedTypes.Count > 0)
{
if (resultGroup.NestedTypes.Count > 1 || !resultGroup.NonMethodIsHidden || lookupGroups.Count > 1)
{
return(new AmbiguousTypeResolveResult(resultGroup.NestedTypes[0]));
}
else
{
return(new TypeResolveResult(resultGroup.NestedTypes[0]));
}
}
if (lookupGroups.Count > 1)
{
return(new AmbiguousMemberResolveResult(targetResolveResult, resultGroup.NonMethod,
resultGroup.NonMethod.ReturnType.Resolve(context)));
}
else
{
return(new MemberResolveResult(targetResolveResult, resultGroup.NonMethod, context));
}
}
/// <summary>
/// Adds all candidates from the method lists.
///
/// This method implements the logic that causes applicable methods in derived types to hide
/// all methods in base types.
/// </summary>
/// <param name="methodLists">The methods, grouped by declaring type. Base types must come first in the list.</param>
public void AddMethodLists(IList <MethodListWithDeclaringType> methodLists)
{
if (methodLists == null)
{
throw new ArgumentNullException("methodLists");
}
// Base types come first, so go through the list backwards (derived types first)
bool[] isHiddenByDerivedType;
if (methodLists.Count > 1)
{
isHiddenByDerivedType = new bool[methodLists.Count];
}
else
{
isHiddenByDerivedType = null;
}
for (int i = methodLists.Count - 1; i >= 0; i--)
{
if (isHiddenByDerivedType != null && isHiddenByDerivedType[i])
{
Log.WriteLine(" Skipping methods in {0} because they are hidden by an applicable method in a derived type", methodLists[i].DeclaringType);
continue;
}
MethodListWithDeclaringType methodList = methodLists[i];
bool foundApplicableCandidateInCurrentList = false;
for (int j = 0; j < methodList.Count; j++)
{
IParameterizedMember method = methodList[j];
Log.Indent();
OverloadResolutionErrors errors = AddCandidate(method);
Log.Unindent();
LogCandidateAddingResult(" Candidate", method, errors);
foundApplicableCandidateInCurrentList |= IsApplicable(errors);
}
if (foundApplicableCandidateInCurrentList && i > 0)
{
foreach (IType baseType in methodList.DeclaringType.GetAllBaseTypes())
{
for (int j = 0; j < i; j++)
{
if (!isHiddenByDerivedType[j] && baseType.Equals(methodLists[j].DeclaringType))
{
isHiddenByDerivedType[j] = true;
}
}
}
}
}
}
/// <summary>
/// Looks up the indexers on the target type.
/// </summary>
public IList <MethodListWithDeclaringType> LookupIndexers(IType targetType)
{
if (targetType == null)
{
throw new ArgumentNullException("targetType");
}
bool allowProtectedAccess = IsProtectedAccessAllowed(targetType);
Predicate <IProperty> filter = delegate(IProperty property) {
return(property.IsIndexer && IsAccessible(property, allowProtectedAccess));
};
List <LookupGroup> lookupGroups = new List <LookupGroup>();
foreach (IType type in targetType.GetNonInterfaceBaseTypes(context))
{
List <IParameterizedMember> newMethods = null;
IMember newNonMethod = null;
IEnumerable <IType> typeBaseTypes = null;
var members = type.GetProperties(context, filter, GetMemberOptions.IgnoreInheritedMembers);
AddMembers(type, members, lookupGroups, true, ref typeBaseTypes, ref newMethods, ref newNonMethod);
if (newMethods != null || newNonMethod != null)
{
lookupGroups.Add(new LookupGroup(type, null, newMethods, newNonMethod));
}
}
// Remove interface members hidden by class members.
if (targetType.Kind == TypeKind.TypeParameter)
{
// This can happen only with type parameters.
RemoveInterfaceMembersHiddenByClassMembers(lookupGroups);
}
// Remove all hidden groups
lookupGroups.RemoveAll(g => g.MethodsAreHidden || g.Methods.Count == 0);
MethodListWithDeclaringType[] methodLists = new MethodListWithDeclaringType[lookupGroups.Count];
for (int i = 0; i < methodLists.Length; i++)
{
methodLists[i] = new MethodListWithDeclaringType(lookupGroups[i].DeclaringType, lookupGroups[i].Methods);
}
return(methodLists);
}
public void CannotInferFromMethodParameterTypes()
{
// static void M<A, B>(Func<A, B> f) {}
// M(int.Parse); // type inference fails
var A = new DefaultTypeParameter(compilation, EntityType.Method, 0, "A");
var B = new DefaultTypeParameter(compilation, EntityType.Method, 1, "B");
IType declType = compilation.FindType(typeof(int));
var methods = new MethodListWithDeclaringType(declType, declType.GetMethods(m => m.Name == "Parse"));
var argument = new MethodGroupResolveResult(new TypeResolveResult(declType), "Parse", new[] { methods }, new IType[0]);
bool success;
ti.InferTypeArguments(new [] { A, B }, new [] { argument },
new [] { new ParameterizedType(compilation.FindType(typeof(Func <,>)).GetDefinition(), new[] { A, B }) },
out success);
Assert.IsFalse(success);
}
public void InferFromMethodReturnType()
{
// static void M<T>(Func<T> f) {}
// M(Console.ReadKey); // type inference produces ConsoleKeyInfo
var T = new DefaultTypeParameter(compilation, EntityType.Method, 0, "T");
IType declType = compilation.FindType(typeof(Console));
var methods = new MethodListWithDeclaringType(declType, declType.GetMethods(m => m.Name == "ReadKey"));
var argument = new MethodGroupResolveResult(new TypeResolveResult(declType), "ReadKey", new[] { methods }, new IType[0]);
bool success;
Assert.AreEqual(
new [] { compilation.FindType(typeof(ConsoleKeyInfo)) },
ti.InferTypeArguments(new [] { T }, new [] { argument },
new [] { new ParameterizedType(compilation.FindType(typeof(Func <>)).GetDefinition(), new[] { T }) },
out success));
Assert.IsTrue(success);
}