-# coding: utf-8
+import importlib
+import random
import re
+from ..utils import bug_reports_message, classproperty, write_string
+
class LazyLoadMetaClass(type):
def __getattr__(cls, name):
- return getattr(cls._get_real_class(), name)
+ # "is_suitable" requires "_TESTS". However, they bloat the lazy_extractors
+ if '_real_class' not in cls.__dict__ and name not in ('is_suitable', 'get_testcases'):
+ write_string(
+ 'WARNING: Falling back to normal extractor since lazy extractor '
+ f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n')
+ return getattr(cls.real_class, name)
class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
- _module = None
- _WORKING = True
-
- @classmethod
- def _get_real_class(cls):
- if '__real_class' not in cls.__dict__:
- mod = __import__(cls._module, fromlist=(cls.__name__,))
- cls.__real_class = getattr(mod, cls.__name__)
- return cls.__real_class
+ @classproperty
+ def real_class(cls):
+ if '_real_class' not in cls.__dict__:
+ cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
+ return cls._real_class
def __new__(cls, *args, **kwargs):
- real_cls = cls._get_real_class()
- instance = real_cls.__new__(real_cls)
+ instance = cls.real_class.__new__(cls.real_class)
instance.__init__(*args, **kwargs)
return instance