/// <summary>
/// Provides an implementation of __contains__. We can pull contains from:
/// ICollection of T which defines Contains directly
/// IList which defines Contains directly
/// IDictionary which defines Contains directly
/// IDictionary of K,V which defines Contains directly
/// IEnumerable of K which we have an InstaceOps helper for
/// IEnumerable which we have an instance ops helper for
/// IEnumerator of K which we have an InstanceOps helper for
/// IEnumerator which we have an instance ops helper for
///
/// String is ignored here because it defines __contains__ via extension methods already.
///
/// The lookup is well ordered and not dependent upon the order of values returned by reflection.
/// </summary>
private static MemberGroup/*!*/ ContainsResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (type == typeof(PythonGenerator)) {
// it's enumerable but doesn't have __contains__
return MemberGroup.EmptyGroup;
}
List<MemberTracker> containsMembers = null;
IList<Type> intf = binder.GetInterfaces(type);
// if we get a __contains__ for something w/ a generic typed to object don't look for non-generic versions
bool hasObjectContains = false;
// search for IDictionary<K, V> first because it's ICollection<KVP<K, V>> and we want to call ContainsKey
foreach (Type t in intf) {
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(IDictionary<,>)) {
if (t.GetGenericArguments()[0] == typeof(object)) {
hasObjectContains = true;
}
if (containsMembers == null) {
containsMembers = new List<MemberTracker>();
}
containsMembers.Add(MethodTracker.FromMemberInfo(t.GetMethod("ContainsKey")));
}
}
if (containsMembers == null) {
// then look for ICollection<T> for generic __contains__ first if we're not an IDictionary<K, V>
foreach (Type t in intf) {
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(ICollection<>)) {
if (t.GetGenericArguments()[0] == typeof(object)) {
hasObjectContains = true;
}
if (containsMembers == null) {
containsMembers = new List<MemberTracker>();
}
containsMembers.Add(MethodTracker.FromMemberInfo(t.GetMethod("Contains")));
}
}
}
if (!hasObjectContains) {
// look for non-generic contains if we didn't already find an overload which takes
// object
if (intf.Contains(typeof(IList))) {
if (containsMembers == null) {
containsMembers = new List<MemberTracker>();
}
containsMembers.Add(MethodTracker.FromMemberInfo(typeof(IList).GetMethod("Contains")));
} else if (intf.Contains(typeof(IDictionary))) {
if (containsMembers == null) {
containsMembers = new List<MemberTracker>();
}
containsMembers.Add(MethodTracker.FromMemberInfo(typeof(IDictionary).GetMethod("Contains")));
} else if (containsMembers == null) {
// see if we can produce a contains for IEnumerable
GetEnumeratorContains(type, intf, ref containsMembers, ref hasObjectContains, typeof(IEnumerable<>), typeof(IEnumerable), String.Empty);
if (containsMembers == null) {
GetEnumeratorContains(type, intf, ref containsMembers, ref hasObjectContains, typeof(IEnumerator<>), typeof(IEnumerator), "IEnumerator");
}
}
}
if (containsMembers != null) {
return new MemberGroup(containsMembers.ToArray());
}
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Provides a resolution for __len__
/// </summary>
private static MemberGroup/*!*/ LengthResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (binder.GetInterfaces(type).Contains(typeof(ICollection))) {
return GetInstanceOpsMethod(type, "LengthMethod");
}
foreach (Type t in binder.GetInterfaces(type)) {
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(ICollection<>)) {
MethodInfo genMeth = typeof(InstanceOps).GetMethod("GenericLengthMethod");
return new MemberGroup(
MethodTracker.FromMemberInfo(genMeth.MakeGenericMethod(t.GetGenericArguments()), type)
);
}
}
return MemberGroup.EmptyGroup;
}