public override DynamicMetaObject BindDeleteMember(DeleteMemberBinder binder) {
switch (binder.Name) {
case "func_dict":
case "__dict__":
return new DynamicMetaObject(
Expression.Call(
typeof(PythonOps).GetMethod("PythonFunctionDeleteDict")
),
BindingRestrictions.GetTypeRestriction(Expression, typeof(PythonFunction))
);
case "__doc__":
case "func_doc":
return new DynamicMetaObject(
Expression.Call(
typeof(PythonOps).GetMethod("PythonFunctionDeleteDoc"),
Expression.Convert(Expression, typeof(PythonFunction))
),
BindingRestrictions.GetTypeRestriction(Expression, typeof(PythonFunction))
);
case "func_defaults":
return new DynamicMetaObject(
Expression.Call(
typeof(PythonOps).GetMethod("PythonFunctionDeleteDefaults"),
Expression.Convert(Expression, typeof(PythonFunction))
),
BindingRestrictions.GetTypeRestriction(Expression, typeof(PythonFunction))
);
}
// first get the default binder value
DynamicMetaObject fallback = binder.FallbackDeleteMember(this);
// then fallback w/ an error suggestion that does a late bound delete
return binder.FallbackDeleteMember(
this,
new DynamicMetaObject(
Expression.Condition(
Ast.Call(
typeof(PythonOps).GetMethod("PythonFunctionDeleteMember"),
AstUtils.Convert(
Expression,
typeof(PythonFunction)
),
Expression.Constant(binder.Name)
),
Expression.Default(typeof(void)), // we deleted the member
AstUtils.Convert(
fallback.Expression, // report language specific error,
typeof(void)
)
),
BindingRestrictions.GetTypeRestriction(Expression, typeof(PythonFunction)).Merge(fallback.Restrictions)
)
);
}
