private static DynamicMetaObject MakeGetItemIterable(DynamicMetaObject metaUserObject, PythonContext state, PythonTypeSlot pts, string method)
{
ParameterExpression tmp = Ast.Parameter(typeof(object), "getitemVal");
return(new DynamicMetaObject(
Expression.Block(
new[] { tmp },
Expression.Call(
typeof(PythonOps).GetMethod(method),
Ast.Block(
MetaPythonObject.MakeTryGetTypeMember(
state,
pts,
tmp,
metaUserObject.Expression,
Ast.Call(
typeof(DynamicHelpers).GetMethod("GetPythonType"),
AstUtils.Convert(
metaUserObject.Expression,
typeof(object)
)
)
),
tmp
),
AstUtils.Constant(
CallSite <Func <CallSite, CodeContext, object, int, object> > .Create(
new PythonInvokeBinder(state, new CallSignature(1))
)
)
)
),
metaUserObject.Restrictions
));
}
/// <summary>
/// Determines if the type associated with the first MetaObject is a subclass of the
/// type associated with the second MetaObject.
/// </summary>
internal static bool IsSubclassOf(DynamicMetaObject /*!*/ xType, DynamicMetaObject /*!*/ yType)
{
PythonType x = MetaPythonObject.GetPythonType(xType);
PythonType y = MetaPythonObject.GetPythonType(yType);
return(x.IsSubclassOf(y));
}
public static SlotOrFunction /*!*/ GetSlotOrFunction(PythonContext /*!*/ state, string op, params DynamicMetaObject[] types)
{
PythonTypeSlot slot;
SlotOrFunction res;
if (TryGetBinder(state, types, op, null, out res))
{
if (res != SlotOrFunction.Empty)
{
return(res);
}
}
else if (MetaUserObject.GetPythonType(types[0]).TryResolveSlot(state.SharedContext, op, out slot))
{
ParameterExpression tmp = Ast.Variable(typeof(object), "slotVal");
Expression[] args = new Expression[types.Length - 1];
for (int i = 1; i < types.Length; i++)
{
args[i - 1] = types[i].Expression;
}
return(new SlotOrFunction(
new DynamicMetaObject(
Ast.Block(
new ParameterExpression[] { tmp },
MetaPythonObject.MakeTryGetTypeMember(
state,
slot,
tmp,
types[0].Expression,
Ast.Call(
typeof(DynamicHelpers).GetMethod("GetPythonType"),
types[0].Expression
)
),
DynamicExpression.Dynamic(
state.Invoke(
new CallSignature(args.Length)
),
typeof(object),
ArrayUtils.Insert <Expression>(
AstUtils.Constant(state.SharedContext),
tmp,
args
)
)
),
BindingRestrictions.Combine(types).Merge(BindingRestrictionsHelpers.GetRuntimeTypeRestriction(types[0].Expression, types[0].GetLimitType()))
),
slot
));
}
return(SlotOrFunction.Empty);
}
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);
}
/// <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);
}
