/// <summary>
/// Provides a resolution for __new__. For standard .NET types __new__ resolves to their
/// constructor. For Python types they inherit __new__ from their base class.
///
/// TODO: Can we just always fallback to object.__new__? If not why not?
/// </summary>
private static MemberGroup/*!*/ NewResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (type.IsSealed && type.IsAbstract) {
// static types don't have __new__
return MemberGroup.EmptyGroup;
}
bool isPythonType = typeof(IPythonObject).IsAssignableFrom(type);
// check and see if __new__ has been overridden by the base type.
foreach (Type t in binder.GetContributingTypes(type)) {
if (!isPythonType && t == typeof(ObjectOps) && type != typeof(object)) {
break;
}
MemberInfo[] news = t.GetMember("__new__");
if (news.Length > 0) {
// type has a specific __new__ overload, return that for the constructor
return GetExtensionMemberGroup(type, news);
}
}
// type has no Python __new__, just return the .NET constructors if they have
// a custom new
ConstructorInfo[] ctors = type.GetConstructors(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);// CompilerHelpers.GetConstructors(type, binder.DomainManager.Configuration.PrivateBinding, true);
ctors = CompilerHelpers.FilterConstructorsToPublicAndProtected(ctors);
if (!PythonTypeOps.IsDefaultNew(ctors)) {
return new MemberGroup(ctors);
}
// if no ctor w/ parameters are defined, fall back to object.__new__ which
// will ignore all the extra arguments allowing the user to just override
// __init__.
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Provides a resolution for __repr__
/// </summary>
private static MemberGroup/*!*/ ReprResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
// __repr__ for normal .NET types is special, if we're a Python type then
// we'll use one of the built-in reprs (from object or from the type)
if (!PythonBinder.IsPythonType(type) &&
(!type.IsSealed || !type.IsAbstract)) { // static types don't get __repr__
// check and see if __repr__ has been overridden by the base type.
foreach (Type t in binder.GetContributingTypes(type)) {
if (t == typeof(ObjectOps) && type != typeof(object)) {
break;
}
if (t.GetMember("__repr__").Length > 0) {
// type has a specific __repr__ overload, pick it up normally later
return MemberGroup.EmptyGroup;
}
}
// no override, pick up the default fancy .NET __repr__
return binder.GetBaseInstanceMethod(type, "FancyRepr");
}
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Helper to see if the type explicitly overrides the method. This ignores members
/// defined on object.
/// </summary>
private static bool TypeOverridesMethod(MemberBinder/*!*/ binder, Type/*!*/ type, string/*!*/ methodName) {
// check and see if the method has been overridden by the base type.
foreach (Type t in binder.GetContributingTypes(type)) {
if (!PythonBinder.IsPythonType(type) && t == typeof(ObjectOps) && type != typeof(object)) {
break;
}
MemberInfo[] reduce = t.GetMember(methodName);
if (reduce.Length > 0) {
// type has a specific overload
return true;
}
}
return false;
}
public override MemberGroup/*!*/ ResolveMember(MemberBinder/*!*/ binder, OldDynamicAction/*!*/ action, Type/*!*/ type, string/*!*/ name) {
foreach (Type t in binder.GetContributingTypes(type)) {
MemberGroup res = new MemberGroup(ArrayUtils.FindAll(t.GetMember(name, BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy), ProtectedOnly));
for (int i = 0; i < res.Count; i++) {
MethodTracker meth = res[i] as MethodTracker;
if (meth == null) {
continue;
}
if (meth.Name == "Finalize" && meth.Method.GetBaseDefinition() == typeof(object).GetMethod("Finalize", BindingFlags.NonPublic | BindingFlags.Instance)) {
MemberTracker[] retained = new MemberTracker[res.Count - 1];
if (res.Count == 1) {
res = MemberGroup.EmptyGroup;
} else {
for (int j = 0; j < i; j++) {
retained[j] = res[j];
}
for (int j = i + 1; j < res.Count; j++) {
retained[j - 1] = res[j];
}
res = new MemberGroup(retained);
}
break;
}
}
res = FilterSpecialNames(res, name, action);
return GetBaseHelperOverloads(PythonTypeOps.GetFinalSystemType(type), name, res);
}
return MemberGroup.EmptyGroup;
}
protected override IEnumerable<string/*!*/>/*!*/ GetCandidateNames(MemberBinder/*!*/ binder, OldDynamicAction/*!*/ action, Type/*!*/ type) {
// these members are visible but only accept derived types.
foreach (Type t in binder.GetContributingTypes(type)) {
MemberInfo[] mems = ArrayUtils.FindAll(t.GetMembers(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic), ProtectedOnly);
foreach (MemberInfo mi in mems) {
yield return mi.Name;
}
}
}
/// <summary>
/// Provides a resolution for __iter__
/// </summary>
private static MemberGroup/*!*/ IterResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (type == typeof(string)) {
// __iter__ is only exposed in 3.0
if (binder.Binder.Context.PythonOptions.Python30) {
return GetInstanceOpsMethod(type, "IterMethodForString");
}
return MemberGroup.EmptyGroup;
}
if (typeof(Bytes).IsAssignableFrom(type)) {
// __iter__ is only exposed in 3.0
if (binder.Binder.Context.PythonOptions.Python30) {
return GetInstanceOpsMethod(type, "IterMethodForBytes");
}
return MemberGroup.EmptyGroup;
}
foreach (Type t in binder.GetContributingTypes(type)) {
MemberInfo[] news = t.GetMember("__iter__");
if (news.Length > 0) {
// type has a specific __iter__ overload, we'll pick it up later
return MemberGroup.EmptyGroup;
}
}
if (!type.GetTypeInfo().IsDefined(typeof(DontMapIEnumerableToIterAttribute), true)) {
// no special __iter__, use the default.
if (typeof(IEnumerable<>).IsAssignableFrom(type)) {
return GetInstanceOpsMethod(type, "IterMethodForGenericEnumerable");
} else if (typeof(IEnumerable).IsAssignableFrom(type)) {
return GetInstanceOpsMethod(type, "IterMethodForEnumerable");
} else if (typeof(IEnumerator<>).IsAssignableFrom(type)) {
return GetInstanceOpsMethod(type, "IterMethodForGenericEnumerator");
} else if (typeof(IEnumerator).IsAssignableFrom(type)) {
return GetInstanceOpsMethod(type, "IterMethodForEnumerator");
}
}
return MemberGroup.EmptyGroup;
}
public override MemberGroup/*!*/ ResolveMember(MemberBinder/*!*/ binder, OldDynamicAction/*!*/ action, Type/*!*/ type, string/*!*/ name) {
if (type.IsSealed && type.IsAbstract) {
// static types don't have PythonOperationKind
return MemberGroup.EmptyGroup;
}
// try mapping __*__ methods to .NET method names
PythonOperationKind opMap;
EnsureOperatorTable();
if (_pythonOperatorTable.TryGetValue(name, out opMap)) {
if (IncludeOperatorMethod(type, opMap)) {
OperatorMapping opInfo;
if (IsReverseOperator(opMap)) {
opInfo = OperatorMapping.GetOperatorMapping(opMap & ~PythonOperationKind.Reversed);
} else {
opInfo = OperatorMapping.GetOperatorMapping(opMap);
}
if (opInfo != null) {
foreach (Type curType in binder.GetContributingTypes(type)) {
if (curType == typeof(BigInteger) &&
(opInfo.Operator == PythonOperationKind.Mod ||
opInfo.Operator == PythonOperationKind.RightShift ||
opInfo.Operator == PythonOperationKind.LeftShift ||
opInfo.Operator == PythonOperationKind.Compare ||
opInfo.Operator == PythonOperationKind.Divide)) {
// we override these with our own modulus/power PythonOperationKind which are different from BigInteger.
continue;
}
Debug.Assert(opInfo.Name != "Equals");
MemberGroup res = GetBaseHelperOverloads(type, opInfo.Name, binder.GetMember(curType, opInfo.Name));
if (res.Count == 0 && opInfo.AlternateName != null) {
res = binder.GetMember(curType, opInfo.AlternateName);
if (opInfo.AlternateName == "Equals") {
// "Equals" is available as an alternate method name. Because it's also on object and Python
// doesn't define it on object we need to filter it out.
res = FilterObjectEquality(res);
} else {
res = GetBaseHelperOverloads(type, opInfo.AlternateName, res);
}
}
if (res.Count > 0) {
return FilterForwardReverseMethods(name, res, type, opMap);
}
}
}
}
}
if (name == "__call__") {
MemberGroup res = binder.GetMember(type, "Call");
if (res.Count > 0) {
return res;
}
}
return MemberGroup.EmptyGroup;
}
public MemberGroup/*!*/ Resolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (type.IsSealed && type.IsAbstract) {
// static types don't have PythonOperationKind
return MemberGroup.EmptyGroup;
}
foreach (Type t in binder.GetContributingTypes(type)) {
if (t == typeof(BigInteger)) continue;
MemberGroup res = binder.GetMember(t, "op_Power");
if (res.Count > 0) {
return FilterForwardReverseMethods(_pythonName, res, type, _op);
}
res = binder.GetMember(t, "Power");
if (res.Count > 0) {
return FilterForwardReverseMethods(_pythonName, res, type, _op);
}
}
return MemberGroup.EmptyGroup;
}
public override MemberGroup/*!*/ ResolveMember(MemberBinder/*!*/ binder, OldDynamicAction/*!*/ action, Type/*!*/ type, string/*!*/ name) {
if (name == ".ctor" || name == ".cctor") return MemberGroup.EmptyGroup;
// normal binding
MemberGroup res;
foreach (Type curType in binder.GetContributingTypes(type)) {
res = GetBaseHelperOverloads(type, name, FilterSpecialNames(binder.GetMember(curType, name), name, action));
if (res.Count > 0) {
return res;
}
}
if (type.IsInterface) {
foreach (Type t in type.GetInterfaces()) {
res = FilterSpecialNames(binder.GetMember(t, name), name, action);
if (res.Count > 0) {
return res;
}
}
}
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Provides a resolution for __hash__, first looking for IStructuralEquatable.GetHashCode,
/// then IValueEquality.GetValueHashCode.
/// </summary>
private static MemberGroup/*!*/ HashResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
#if FEATURE_VALUE_EQUALITY
if (typeof(IStructuralEquatable).IsAssignableFrom(type) && !type.IsInterface()) {
#else
if ((typeof(IStructuralEquatable).IsAssignableFrom(type) ||
typeof(IValueEquality).IsAssignableFrom(type)) && !type.IsInterface) {
#endif
// check and see if __hash__ has been overridden by the base type.
foreach (Type t in binder.GetContributingTypes(type)) {
// if it's defined on object, it's not overridden
if (t == typeof(ObjectOps) || t == typeof(object)) {
break;
}
MemberInfo[] hash = t.GetMember("__hash__");
if (hash.Length > 0) {
return MemberGroup.EmptyGroup;
}
}
#if FEATURE_VALUE_EQUALITY
return GetInstanceOpsMethod(type, "StructuralHashMethod");
#else
if (typeof(IStructuralEquatable).IsAssignableFrom(type)) {
return GetInstanceOpsMethod(type, "StructuralHashMethod");
}
if (typeof(IValueEquality).IsAssignableFrom(type)) {
return new MemberGroup(typeof(IValueEquality).GetMethod("GetValueHashCode"));
}
#endif
}
// otherwise we'll pick up __hash__ from ObjectOps which will call .NET's .GetHashCode therefore
// we don't explicitly search to see if the object overrides GetHashCode here.
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Helper to get the proper typecasting method, according to the following precedence rules:
///
/// 1. Strongest (most specific) declaring type
/// 2. Strongest (most specific) parameter type
/// 3. Type of conversion
/// i. Implicit
/// ii. Explicit
/// 4. Return type (order specified in toTypes)
/// </summary>
private static MethodInfo FindCastMethod(MemberBinder/*!*/ binder, Type/*!*/ fromType, List<Type>/*!*/ toTypes) {
MethodInfo cast = null;
ParameterInfo[] castParams = null;
foreach (Type t in binder.GetContributingTypes(fromType)) {
foreach (string castName in CastNames) {
foreach (MemberInfo member in t.GetMember(castName)) {
MethodInfo method;
ParameterInfo[] methodParams;
// Necessary conditions
if (member.MemberType != MemberTypes.Method) {
continue;
}
method = (MethodInfo)member;
if (!toTypes.Contains(method.ReturnType) ||
(methodParams = method.GetParameters()).Length != 1) {
continue;
}
// Precedence rule 1
if (cast == null || method.DeclaringType.IsSubclassOf(cast.DeclaringType)) {
cast = method;
castParams = methodParams;
continue;
} else if (method.DeclaringType != cast.DeclaringType) {
continue;
}
// Precedence rule 2
if (methodParams[0].ParameterType.IsSubclassOf(castParams[0].ParameterType)) {
cast = method;
castParams = methodParams;
continue;
} else if (castParams[0].ParameterType != methodParams[0].ParameterType) {
continue;
}
// Precedence rule 3
if (method.Name != cast.Name) {
if (method.Name == "op_Implicit") {
cast = method;
castParams = methodParams;
}
continue;
}
// Precedence rule 4:
foreach (Type toType in toTypes) {
if (method.ReturnType == toType) {
cast = method;
castParams = methodParams;
} else if (cast.ReturnType == toType) {
break;
}
}
}
}
}
return cast;
}
protected override IEnumerable<string/*!*/>/*!*/ GetCandidateNames(MemberBinder/*!*/ binder, MemberRequestKind/*!*/ action, Type/*!*/ type) {
// these members are visible but only accept derived types.
foreach (Type t in binder.GetContributingTypes(type)) {
foreach (MemberInfo mi in t.GetMembers(BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic)) {
if (ProtectedOnly(mi)) {
yield return mi.Name;
}
}
}
}
public override MemberGroup/*!*/ ResolveMember(MemberBinder/*!*/ binder, MemberRequestKind/*!*/ action, Type/*!*/ type, string/*!*/ name) {
foreach (Type t in binder.GetContributingTypes(type)) {
MemberGroup res = new MemberGroup(
t.GetMember(name, BindingFlags.Static | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy)
.Where(ProtectedOnly)
.ToArray());
for (int i = 0; i < res.Count; i++) {
MethodTracker meth = res[i] as MethodTracker;
if (meth == null) {
continue;
}
if (meth.Name == "Finalize" && meth.Method.GetBaseDefinition() == typeof(object).GetMethod("Finalize", BindingFlags.NonPublic | BindingFlags.Instance)) {
MemberTracker[] retained = new MemberTracker[res.Count - 1];
if (res.Count == 1) {
res = MemberGroup.EmptyGroup;
} else {
for (int j = 0; j < i; j++) {
retained[j] = res[j];
}
for (int j = i + 1; j < res.Count; j++) {
retained[j - 1] = res[j];
}
res = new MemberGroup(retained);
}
break;
}
}
return FilterSpecialNames(res, name, action);
}
return MemberGroup.EmptyGroup;
}
public MemberGroup/*!*/ Resolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (type.IsSealed() && type.IsAbstract()) {
// static types don't have PythonOperationKind
return MemberGroup.EmptyGroup;
}
foreach (Type t in binder.GetContributingTypes(type)) {
MemberGroup res = binder.GetMember(t, _methodName);
if (res.Count > 0) {
return FilterForwardReverseMethods(_pythonName, res, type, _op);
}
}
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Provides a resolution for __iter__
/// </summary>
private static MemberGroup/*!*/ IterResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
// no __iter__ on string, just __getitem__
if (type != typeof(string)) {
if (typeof(System.Collections.IEnumerable).IsAssignableFrom(type)) {
foreach (Type t in binder.GetContributingTypes(type)) {
MemberInfo[] news = t.GetMember("__iter__");
if (news.Length > 0) {
// type has a specific __i__ overload, we'll pick it up later
return MemberGroup.EmptyGroup;
}
}
// no special __iter__, use the default.
return GetInstanceOpsMethod(type, "IterMethod");
}
}
return MemberGroup.EmptyGroup;
}
protected override IEnumerable<string/*!*/>/*!*/ GetCandidateNames(MemberBinder/*!*/ binder, OldDynamicAction/*!*/ action, Type/*!*/ type) {
foreach (Type curType in binder.GetContributingTypes(type)) {
foreach (MemberInfo mi in curType.GetMembers(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)) {
if (mi.MemberType == MemberTypes.Method) {
MethodInfo meth = (MethodInfo)mi;
if (meth.IsSpecialName) {
if (meth.IsDefined(typeof(PropertyMethodAttribute), true)) {
if (meth.Name.StartsWith("Get") || meth.Name.StartsWith("Set")) {
yield return meth.Name.Substring(3);
} else {
Debug.Assert(meth.Name.StartsWith("Delete"));
yield return meth.Name.Substring(6);
}
}
continue;
}
}
yield return mi.Name;
}
}
}
/// <summary>
/// Looks for an Equals overload defined on the type and if one is present binds __ne__ to an
/// InstanceOps helper.
/// </summary>
private static MemberGroup/*!*/ FallbackInequalityResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
// if object defines __eq__ then we can call the reverse version
if (IncludeOperatorMethod(type, PythonOperationKind.NotEqual)) {
foreach (Type curType in binder.GetContributingTypes(type)) {
MemberGroup mg = binder.GetMember(curType, "Equals");
foreach (MemberTracker mt in mg) {
if (mt.MemberType != TrackerTypes.Method || mt.DeclaringType == typeof(object)) {
continue;
}
MethodTracker method = (MethodTracker)mt;
if ((method.Method.Attributes & MethodAttributes.NewSlot) != 0) {
continue;
}
ParameterInfo[] pis = method.Method.GetParameters();
if (pis.Length == 1) {
if (pis[0].ParameterType == typeof(object)) {
return new MemberGroup(MethodTracker.FromMemberInfo(typeof(InstanceOps).GetMethod("NotEqualsMethod"), curType));
}
}
}
}
}
return MemberGroup.EmptyGroup;
}
/// <summary>
/// Provides a resolution for IValueEquality.GetValueHashCode to __hash__.
/// </summary>
private static MemberGroup/*!*/ HashResolver(MemberBinder/*!*/ binder, Type/*!*/ type) {
if (typeof(IValueEquality).IsAssignableFrom(type) && !type.IsInterface) {
// check and see if __new__ has been overridden by the base type.
foreach (Type t in binder.GetContributingTypes(type)) {
if (t == typeof(ObjectOps) || t == typeof(object)) {
break;
}
MemberInfo[] hash = t.GetMember("__hash__");
if (hash.Length > 0) {
return MemberGroup.EmptyGroup;
}
}
return new MemberGroup(typeof(IValueEquality).GetMethod("GetValueHashCode"));
}
// otherwise we'll pick up __hash__ from ObjectOps which will call .NET's .GetHashCode therefore
// we don't explicitly search to see if the object overrides GetHashCode here.
return MemberGroup.EmptyGroup;
}
