comparison mercurial/thirdparty/zope/interface/declarations.py @ 37179:49630e75635d

thirdparty: allow zope.interface.advice to be lazily imported

The symbol from this module is only used in functions. Let's access
that symbol through its imported module so importing
zope.interface.advice can be lazy.

Differential Revision: https://phab.mercurial-scm.org/D2931

37178:68ee61822182

from types import FunctionType
from types import MethodType
from types import ModuleType
import weakref

from .advice import addClassAdvisor
from .interface import InterfaceClass
from .interface import SpecificationBase
from .interface import Specification
from ._compat import CLASS_TYPES as DescriptorAwareMetaClasses
from ._compat import PYTHON3

    if '__implements_advice_data__' in locals:
        raise TypeError(name+" can be used only once in a class definition.")

    locals['__implements_advice_data__'] = interfaces, classImplements
    addClassAdvisor(_implements_advice, depth=3)

def implements(*interfaces):
    """Declare interfaces implemented by instances of a class

      This function is called in a class definition.

        raise TypeError(
            "classProvides can only be used once in a class definition.")

    locals["__provides__"] = _normalizeargs(interfaces)

    addClassAdvisor(_classProvides_advice, depth=2)

def _classProvides_advice(cls):
    # This entire approach is invalid under Py3K.  Don't even try to fix
    # the coverage for this block there. :(
    interfaces = cls.__dict__['__provides__']

37179:49630e75635d

from types import FunctionType
from types import MethodType
from types import ModuleType
import weakref

from . import advice as advicemod
from .interface import InterfaceClass
from .interface import SpecificationBase
from .interface import Specification
from ._compat import CLASS_TYPES as DescriptorAwareMetaClasses
from ._compat import PYTHON3

    if '__implements_advice_data__' in locals:
        raise TypeError(name+" can be used only once in a class definition.")

    locals['__implements_advice_data__'] = interfaces, classImplements
    advicemod.addClassAdvisor(_implements_advice, depth=3)

def implements(*interfaces):
    """Declare interfaces implemented by instances of a class

      This function is called in a class definition.

        raise TypeError(
            "classProvides can only be used once in a class definition.")

    locals["__provides__"] = _normalizeargs(interfaces)

    advicemod.addClassAdvisor(_classProvides_advice, depth=2)

def _classProvides_advice(cls):
    # This entire approach is invalid under Py3K.  Don't even try to fix
    # the coverage for this block there. :(
    interfaces = cls.__dict__['__provides__']