def create_ext_command_attrs():
regen_const_info = clr.GetClrType(RegenerationAttribute).GetConstructor(Array[Type]((RegenerationOption,)))
regen_attr_builder = CustomAttributeBuilder(regen_const_info, Array[object]((RegenerationOption.Manual,)))
# add TransactionAttribute to type
trans_constructor_info = clr.GetClrType(TransactionAttribute).GetConstructor(Array[Type]((TransactionMode,)))
trans_attrib_builder = CustomAttributeBuilder(trans_constructor_info, Array[object]((TransactionMode.Manual,)))
return [regen_attr_builder, trans_attrib_builder]
def emit_classattribs(self, typebld):
if hasattr(self, '_clrclassattribs'):
for attrib_info in self._clrclassattribs:
if isinstance(attrib_info, type):
ci = clr.GetClrType(attrib_info).GetConstructor(())
cab = CustomAttributeBuilder(ci, ())
elif isinstance(attrib_info, CustomAttributeDecorator):
cab = attrib_info.GetBuilder()
else:
make_decorator = attrib_info()
cab = make_decorator.GetBuilder()
typebld.SetCustomAttribute(cab)
def make_cab(attrib_type, *args, **kwds):
clrtype = clr.GetClrType(attrib_type)
argtypes = tuple(map(lambda x:clr.GetClrType(type(x)), args))
ci = clrtype.GetConstructor(argtypes)
props = ([],[])
fields = ([],[])
for kwd in kwds:
pi = clrtype.GetProperty(kwd)
if pi is not None:
props[0].append(pi)
props[1].append(kwds[kwd])
else:
fi = clrtype.GetField(kwd)
if fi is not None:
fields[0].append(fi)
fields[1].append(kwds[kwd])
else:
raise TypeError("No %s Member found on %s" % (kwd, clrtype.Name))
return CustomAttributeBuilder(ci, args,
tuple(props[0]), tuple(props[1]),
tuple(fields[0]), tuple(fields[1]))
def test_critical_custom_attributes():
'''
Ensure adding custom attributes to a Python class remains supported.
'''
global called
global TYPE_COUNTER
TYPE_COUNTER += 1
import clr
from System.Reflection.Emit import CustomAttributeBuilder, OpCodes
clr.AddReference("Microsoft.Scripting")
from Microsoft.Scripting.Generation import Snippets
clr.AddReference("System.Xml")
from System.Xml.Serialization import XmlRootAttribute
xmlroot_clrtype = clr.GetClrType(XmlRootAttribute)
xmlroot_ci = xmlroot_clrtype.GetConstructor((clr.GetClrType(str), ))
XmlRootInstance = CustomAttributeBuilder(
xmlroot_ci, ("product", ),
(xmlroot_clrtype.GetProperty("Namespace"), ),
("http://ironpython.codeplex.com", ), (), ())
called = False
class MyType(type):
def __clrtype__(self):
global called
baseType = super(MyType, self).__clrtype__()
typegen = Snippets.Shared.DefineType(
"faux type" + str(TYPE_COUNTER), baseType, True, False)
typebld = typegen.TypeBuilder
for ctor in baseType.GetConstructors():
ctorparams = ctor.GetParameters()
ctorbld = typebld.DefineConstructor(
ctor.Attributes, ctor.CallingConvention,
tuple([p.ParameterType for p in ctorparams]))
ilgen = ctorbld.GetILGenerator()
ilgen.Emit(OpCodes.Ldarg, 0)
for index in range(len(ctorparams)):
ilgen.Emit(OpCodes.Ldarg, index + 1)
ilgen.Emit(OpCodes.Call, ctor)
ilgen.Emit(OpCodes.Ret)
typebld.SetCustomAttribute(XmlRootInstance)
called = True
return typebld.CreateType()
class X(object):
__metaclass__ = MyType
#Verification
AreEqual(called, True)
x = X()
x_clrtype = clr.GetClrType(X)
AreEqual(
x_clrtype.GetCustomAttributes(XmlRootAttribute, True)[0].ElementName,
"product")
AreEqual(
x_clrtype.GetCustomAttributes(XmlRootAttribute, True)[0].Namespace,
"http://ironpython.codeplex.com")