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# -*- coding: utf-8 -*-
'''
:codeauthor: :email:`Pedro Algarvio (pedro@algarvio.me)`
:copyright: © 2016-2017 by the SaltStack Team, see AUTHORS for more details.
:license: Apache 2.0, see LICENSE for more details.
pytest_helpers_namespace.plugin
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Pytest Helpers Namespace Plugin
'''
# Import python libs
from functools import partial, wraps
class FuncWrapper(object):
def __init__(self, func):
self.func = func
def register(self, func):
'''
This function will just raise a RuntimeError in case a function
registration, which also sets a nested namespace, tries to override
a known helper function with that nested namespace.
This will just make the raised error make more sense.
Instead of "AttributeError: 'function' object has no attribute 'register'",
we will raise the excption below.
'''
raise RuntimeError(
'A namespace is already registered under the name: {0}'.format(
func.__name__
)
)
def __call__(self, *args, **kwargs):
'''
This wrapper will just call the actual helper function
'''
__tracebackhide__ = True
return self.func(*args, **kwargs)
class HelpersRegistry(object):
'''
Helper functions registrar which supports namespaces
'''
__slots__ = ('_registry',)
def __init__(self):
self._registry = {}
def register(self, func, name=None):
'''
Register's a new function as a helper
'''
if isinstance(func, str):
return partial(self.register, name=func)
if name is None:
name = func.__name__
if name in self._registry:
raise RuntimeError(
'A helper function is already registered under the name: {0}'.format(
name
)
)
self._registry[name] = wraps(func)(FuncWrapper(func))
return func
def __getattribute__(self, name):
if name in ('__class__', '_registry', 'register'):
return object.__getattribute__(self, name)
return self._registry.setdefault(name, self.__class__())
def __repr__(self):
return '{0} {1!r}>'.format(self.__class__.__name__, self._registry)
def __call__(self, *args, **kwargs):
raise RuntimeError(
'The helper being called was not registred'
)
def pytest_namespace():
'''
Register our own namespace with pytest
'''
return {'helpers': HelpersRegistry()}
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