static PropertyDescriptor[] GetPropertiesImpl(object self, Attribute[] attributes)
{
IList <object> attrNames = PythonOps.GetAttrNames(DefaultContext.DefaultCLS, self);
List <PropertyDescriptor> descrs = new List <PropertyDescriptor>();
if (attrNames != null)
{
foreach (object o in attrNames)
{
string s = o as string;
if (s == null)
{
continue;
}
PythonTypeSlot attrSlot;
PythonType dt = DynamicHelpers.GetPythonType(self);
dt.TryResolveSlot(DefaultContext.DefaultCLS, s, out attrSlot);
object attrVal = ObjectOps.__getattribute__(DefaultContext.DefaultCLS, self, s);
Type attrType = (attrVal == null) ? typeof(NoneTypeOps) : attrVal.GetType();
if ((attrSlot != null && ShouldIncludeProperty(attrSlot, attributes)) ||
(attrSlot == null && ShouldIncludeInstanceMember(s, attributes)))
{
descrs.Add(new SuperDynamicObjectPropertyDescriptor(s, attrType, self.GetType()));
}
}
}
return(descrs.ToArray());
}
private static bool IsBuiltinConversion(CodeContext /*!*/ context, PythonTypeSlot /*!*/ pts, string name, PythonType /*!*/ selfType)
{
Type baseType = selfType.UnderlyingSystemType.BaseType;
Type tmpType = baseType;
do
{
if (tmpType.IsGenericType && tmpType.GetGenericTypeDefinition() == typeof(Extensible <>))
{
baseType = tmpType.GetGenericArguments()[0];
break;
}
tmpType = tmpType.BaseType;
} while (tmpType != null);
PythonType ptBase = DynamicHelpers.GetPythonTypeFromType(baseType);
PythonTypeSlot baseSlot;
if (ptBase.TryResolveSlot(context, name, out baseSlot) && pts == baseSlot)
{
return(true);
}
return(false);
}
internal static DynamicMetaObject ConvertToIEnumerator(DynamicMetaObjectBinder /*!*/ conversion, DynamicMetaObject /*!*/ metaUserObject)
{
PythonType pt = MetaPythonObject.GetPythonType(metaUserObject);
PythonContext state = PythonContext.GetPythonContext(conversion);
CodeContext context = state.SharedContext;
PythonTypeSlot pts;
if (pt.TryResolveSlot(context, "__iter__", out pts))
{
ParameterExpression tmp = Ast.Parameter(typeof(object), "iterVal");
return(new DynamicMetaObject(
Expression.Block(
new[] { tmp },
Expression.Call(
typeof(PythonOps).GetMethod("CreatePythonEnumerator"),
Ast.Block(
MetaPythonObject.MakeTryGetTypeMember(
state,
pts,
metaUserObject.Expression,
tmp
),
Ast.Dynamic(
new PythonInvokeBinder(
state,
new CallSignature(0)
),
typeof(object),
AstUtils.Constant(context),
tmp
)
)
)
),
metaUserObject.Restrictions
));
}
else if (pt.TryResolveSlot(context, "__getitem__", out pts))
{
return(MakeGetItemIterable(metaUserObject, state, pts, "CreateItemEnumerator"));
}
return(null);
}
internal static DynamicMetaObject ConvertToIEnumerable(DynamicMetaObjectBinder /*!*/ conversion, DynamicMetaObject /*!*/ metaUserObject)
{
PythonType pt = MetaPythonObject.GetPythonType(metaUserObject);
PythonContext pyContext = PythonContext.GetPythonContext(conversion);
CodeContext context = pyContext.SharedContext;
PythonTypeSlot pts;
if (pt.TryResolveSlot(context, "__iter__", out pts))
{
return(MakeIterRule(metaUserObject, "CreatePythonEnumerable"));
}
else if (pt.TryResolveSlot(context, "__getitem__", out pts))
{
return(MakeGetItemIterable(metaUserObject, pyContext, pts, "CreateItemEnumerable"));
}
return(null);
}
private static void AddFinalizer(CodeContext /*!*/ context, PythonType dt, object newObject)
{
// check if object has finalizer...
if (dt.TryResolveSlot(context, "__del__", out _))
{
IWeakReferenceable iwr = context.LanguageContext.ConvertToWeakReferenceable(newObject);
Debug.Assert(iwr != null);
InstanceFinalizer nif = new InstanceFinalizer(context, newObject);
iwr.SetFinalizer(new WeakRefTracker(iwr, nif, nif));
}
}
internal static bool TryGetOperator(CodeContext context, object o, string name, out object callable)
{
PythonType pt = DynamicHelpers.GetPythonType(o);
if (pt.TryResolveSlot(context, name, out PythonTypeSlot pts) &&
pts.TryGetValue(context, o, pt, out callable))
{
return(true);
}
callable = default;
return(false);
}
/// <summary>
/// Determines if a type member can be imported. This is used to treat static types like modules.
/// </summary>
private static bool IsStaticTypeMemberInAll(CodeContext /*!*/ context, PythonType /*!*/ pt, string name, out object res)
{
PythonTypeSlot pts;
res = null;
if (pt.TryResolveSlot(context, name, out pts))
{
if (name == "__doc__" || name == "__class__")
{
// these exist but we don't want to clobber __doc__ on import * or bring in __class__
return(false);
}
else if (pts is ReflectedGetterSetter)
{
// property or indexer, these fetch the value at runtime, the user needs to explicitly
// import them using from type import property
return(false);
}
ReflectedField rf = pts as ReflectedField;
if (rf != null && !rf._info.IsInitOnly && !rf._info.IsLiteral)
{
// only bring in read-only fields, if the value can change the user needs to explicitly
// import by name
return(false);
}
BuiltinMethodDescriptor method = pts as BuiltinMethodDescriptor;
if (method != null && (!method.DeclaringType.IsSealed() || !method.DeclaringType.IsAbstract()))
{
// inherited object member on a static class (GetHashCode, Equals, etc...)
return(false);
}
BuiltinFunction bf = pts as BuiltinFunction;
if (bf != null && (!bf.DeclaringType.IsSealed() || !bf.DeclaringType.IsAbstract()))
{
// __new__/ReferenceEquals inherited from object
return(false);
}
if (pts.TryGetValue(context, null, pt, out res))
{
return(true);
}
}
res = null;
return(false);
}
private static object GetTypeNew(CodeContext /*!*/ context, PythonType dt)
{
PythonTypeSlot dts;
if (!dt.TryResolveSlot(context, "__new__", out dts))
{
throw PythonOps.TypeError("cannot create instances of {0}", dt.Name);
}
object newInst;
bool res = dts.TryGetValue(context, dt, dt, out newInst);
Debug.Assert(res);
return(newInst);
}
static PropertyDescriptor[] GetPropertiesImpl(object self, Attribute[] attributes)
{
IList <object> attrNames = PythonOps.GetAttrNames(DefaultContext.DefaultCLS, self);
List <PropertyDescriptor> descrs = new List <PropertyDescriptor>();
if (attrNames != null)
{
foreach (object o in attrNames)
{
if (!(o is string s))
{
continue;
}
PythonTypeSlot attrSlot = null;
object attrVal;
if (self is OldInstance)
{
if (((OldInstance)self)._class.TryLookupSlot(s, out attrVal))
{
attrSlot = attrVal as PythonTypeSlot;
}
else if (!((OldInstance)self).Dictionary.TryGetValue(s, out attrVal))
{
attrVal = ObjectOps.__getattribute__(DefaultContext.DefaultCLS, self, s);
}
}
else
{
PythonType dt = DynamicHelpers.GetPythonType(self);
dt.TryResolveSlot(DefaultContext.DefaultCLS, s, out attrSlot);
attrVal = ObjectOps.__getattribute__(DefaultContext.DefaultCLS, self, s);
}
Type attrType = (attrVal == null) ? typeof(NoneTypeOps) : attrVal.GetType();
if ((attrSlot != null && ShouldIncludeProperty(attrSlot, attributes)) ||
(attrSlot == null && ShouldIncludeInstanceMember(s, attributes)))
{
descrs.Add(new SuperDynamicObjectPropertyDescriptor(s, attrType, self.GetType()));
}
}
}
return(descrs.ToArray());
}
internal static bool TryInvokeTernaryOperator(CodeContext context, object o, object arg1, object arg2, string name, out object value)
{
PerfTrack.NoteEvent(PerfTrack.Categories.Temporary, "TernaryOp " + CompilerHelpers.GetType(o).Name + " " + name);
PythonTypeSlot pts;
PythonType pt = DynamicHelpers.GetPythonType(o);
object callable;
if (pt.TryResolveSlot(context, name, out pts) &&
pts.TryGetValue(context, o, pt, out callable))
{
value = PythonCalls.Call(context, callable, arg1, arg2);
return(true);
}
value = null;
return(false);
}
/// <summary>
/// Tries to get the BuiltinFunction for the given name on the type of the provided MetaObject.
///
/// Succeeds if the MetaObject is a BuiltinFunction or BuiltinMethodDescriptor.
/// </summary>
internal static bool TryGetStaticFunction(PythonContext /*!*/ state, string op, DynamicMetaObject /*!*/ mo, out BuiltinFunction function)
{
PythonType type = MetaPythonObject.GetPythonType(mo);
function = null;
if (!String.IsNullOrEmpty(op))
{
PythonTypeSlot xSlot;
object val;
if (type.TryResolveSlot(state.SharedContext, op, out xSlot) &&
xSlot.TryGetValue(state.SharedContext, null, type, out val))
{
function = TryConvertToBuiltinFunction(val);
if (function == null)
{
return(false);
}
}
}
return(true);
}
private DynamicMetaObject /*!*/ MakeConvertRuleForCall(DynamicMetaObjectBinder /*!*/ convertToAction, Type toType, DynamicMetaObject /*!*/ self, string name, string returner, Func <DynamicMetaObject> fallback, Func <Expression, Expression> resultConverter)
{
PythonType pt = ((IPythonObject)self.Value).PythonType;
PythonTypeSlot pts;
CodeContext context = PythonContext.GetPythonContext(convertToAction).SharedContext;
ValidationInfo valInfo = BindingHelpers.GetValidationInfo(this, pt);
if (pt.TryResolveSlot(context, name, out pts) && !IsBuiltinConversion(context, pts, name, pt))
{
ParameterExpression tmp = Ast.Variable(typeof(object), "func");
Expression callExpr = resultConverter(
Ast.Call(
PythonOps.GetConversionHelper(returner, GetResultKind(convertToAction)),
Ast.Dynamic(
PythonContext.GetPythonContext(convertToAction).InvokeNone,
typeof(object),
PythonContext.GetCodeContext(convertToAction),
tmp
)
)
);
if (typeof(Extensible <>).MakeGenericType(toType).IsAssignableFrom(self.GetLimitType()))
{
// if we're doing a conversion to the underlying type and we're an
// Extensible<T> of that type:
// if an extensible type returns it's self in a conversion, then we need
// to actually return the underlying value. If an extensible just keeps
// returning more instances of it's self a stack overflow occurs - both
// behaviors match CPython.
callExpr = AstUtils.Convert(AddExtensibleSelfCheck(convertToAction, toType, self, callExpr), typeof(object));
}
return(BindingHelpers.AddDynamicTestAndDefer(
convertToAction,
new DynamicMetaObject(
Ast.Condition(
MakeTryGetTypeMember(
PythonContext.GetPythonContext(convertToAction),
pts,
self.Expression,
tmp
),
callExpr,
AstUtils.Convert(
ConversionFallback(convertToAction),
typeof(object)
)
),
self.Restrict(self.GetRuntimeType()).Restrictions
),
new DynamicMetaObject[] { this },
valInfo,
tmp
));
}
return(fallback());
}
public TResult MakeTypeGetMember()
{
PythonTypeSlot pts;
bool isFinal = false, metaOnly = false;
CodeContext lookupContext = _context.LanguageContext.SharedClsContext;
// first look in the meta-class to see if we have a get/set descriptor
PythonType metaType = DynamicHelpers.GetPythonType(Value);
foreach (PythonType pt in metaType.ResolutionOrder)
{
if (pt.TryLookupSlot(lookupContext, _name, out pts) && pts.IsSetDescriptor(lookupContext, metaType))
{
if (AddMetaSlotAccess(metaType, pts))
{
metaOnly = isFinal = true;
break;
}
}
}
if (!isFinal)
{
// then search the MRO to see if we have the value
foreach (PythonType pt in Value.ResolutionOrder)
{
if (pt.IsOldClass)
{
// mixed new-style/old-style class, search the one slot in it's MRO for the member
AddOldClassAccess(pt);
}
else if (pt.TryLookupSlot(lookupContext, _name, out pts))
{
if (AddSlotAccess(pt, pts))
{
isFinal = true;
break;
}
}
}
}
if (!isFinal)
{
// then go back to the meta class to see if we have a normal attribute
foreach (PythonType pt in metaType.ResolutionOrder)
{
if (pt.OldClass != null)
{
// mixed new-style/old-style class, just call our version of __getattribute__
// and let it sort it out at runtime.
AddMetaOldClassAccess();
isFinal = true;
break;
}
else if (pt.TryLookupSlot(lookupContext, _name, out pts))
{
if (AddMetaSlotAccess(metaType, pts))
{
isFinal = true;
break;
}
}
}
}
if (!isFinal)
{
// the member doesn't exist anywhere in the type hierarchy, see if
// we define __getattr__ on our meta type.
if (metaType.TryResolveSlot(_context, "__getattr__", out pts) &&
!pts.IsSetDescriptor(lookupContext, metaType)) // we tried get/set descriptors initially
{
AddMetaGetAttribute(metaType, pts);
isFinal = pts.GetAlwaysSucceeds;
}
}
if (!isFinal)
{
AddError();
}
return(Finish(metaOnly));
}
internal static DynamicMetaObject Call(DynamicMetaObjectBinder /*!*/ call, DynamicMetaObject target, DynamicMetaObject /*!*/[] /*!*/ args)
{
Assert.NotNull(call, args);
Assert.NotNullItems(args);
if (target.NeedsDeferral())
{
return(call.Defer(ArrayUtils.Insert(target, args)));
}
foreach (DynamicMetaObject mo in args)
{
if (mo.NeedsDeferral())
{
RestrictTypes(args);
return(call.Defer(
ArrayUtils.Insert(target, args)
));
}
}
DynamicMetaObject self = target.Restrict(target.GetLimitType());
ValidationInfo valInfo = BindingHelpers.GetValidationInfo(target);
PythonType pt = DynamicHelpers.GetPythonType(target.Value);
PythonContext pyContext = PythonContext.GetPythonContext(call);
// look for __call__, if it's present dispatch to it. Otherwise fall back to the
// default binder
PythonTypeSlot callSlot;
if (!typeof(Delegate).IsAssignableFrom(target.GetLimitType()) &&
pt.TryResolveSlot(pyContext.SharedContext, "__call__", out callSlot))
{
ConditionalBuilder cb = new ConditionalBuilder(call);
callSlot.MakeGetExpression(
pyContext.Binder,
PythonContext.GetCodeContext(call),
self,
GetPythonType(self),
cb
);
if (!cb.IsFinal)
{
cb.FinishCondition(GetCallError(call, self));
}
Expression[] callArgs = ArrayUtils.Insert(
PythonContext.GetCodeContext(call),
cb.GetMetaObject().Expression,
DynamicUtils.GetExpressions(args)
);
Expression body = DynamicExpression.Dynamic(
PythonContext.GetPythonContext(call).Invoke(
BindingHelpers.GetCallSignature(call)
),
typeof(object),
callArgs
);
body = Ast.TryFinally(
Ast.Block(
Ast.Call(typeof(PythonOps).GetMethod(nameof(PythonOps.FunctionPushFrame)), Ast.Constant(pyContext)),
body
),
Ast.Call(typeof(PythonOps).GetMethod(nameof(PythonOps.FunctionPopFrame)))
);
return(BindingHelpers.AddDynamicTestAndDefer(
call,
new DynamicMetaObject(body, self.Restrictions.Merge(BindingRestrictions.Combine(args))),
args,
valInfo
));
}
return(null);
}
public TResult MakeTypeGetMember()
{
PythonTypeSlot pts;
bool isFinal = false, metaOnly = false;
CodeContext lookupContext = PythonContext.GetContext(_context).SharedClsContext;
// first look in the meta-class to see if we have a get/set descriptor
PythonType metaType = DynamicHelpers.GetPythonType(Value);
foreach (PythonType pt in metaType.ResolutionOrder)
{
if (pt.TryLookupSlot(lookupContext, _name, out pts) && pts.IsSetDescriptor(lookupContext, metaType))
{
if (AddMetaSlotAccess(metaType, pts))
{
metaOnly = isFinal = true;
break;
}
}
}
if (!isFinal)
{
// then search the MRO to see if we have the value
foreach (PythonType pt in Value.ResolutionOrder)
{
if (pt.TryLookupSlot(lookupContext, _name, out pts))
{
if (AddSlotAccess(pt, pts))
{
isFinal = true;
break;
}
}
}
}
if (!isFinal)
{
// then go back to the meta class to see if we have a normal attribute
foreach (PythonType pt in metaType.ResolutionOrder)
{
if (pt.TryLookupSlot(lookupContext, _name, out pts))
{
if (AddMetaSlotAccess(metaType, pts))
{
isFinal = true;
break;
}
}
}
}
if (!isFinal)
{
// the member doesn't exist anywhere in the type hierarchy, see if
// we define __getattr__ on our meta type.
if (metaType.TryResolveSlot(_context, "__getattr__", out pts) &&
!pts.IsSetDescriptor(lookupContext, metaType)) // we tried get/set descriptors initially
{
AddMetaGetAttribute(metaType, pts);
isFinal = pts.GetAlwaysSucceeds;
}
}
if (!isFinal)
{
AddError();
}
return(Finish(metaOnly));
}
