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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Mechanism for registering and loading ARIA extensions.
"""
# pylint: disable=no-self-use
from .utils import collections
class _Registrar(object):
def __init__(self, registry):
if not isinstance(registry, (dict, list)):
raise RuntimeError('Unsupported registry type')
self._registry = registry
def register(self, function):
result = function()
if isinstance(self._registry, dict):
for key in result:
if key in self._registry:
raise RuntimeError('Re-definition of {0} in {1}'.format(key, function.__name__))
self._registry.update(result)
elif isinstance(self._registry, list):
if not isinstance(result, (list, tuple, set)):
result = [result]
self._registry += list(result)
else:
raise RuntimeError('Illegal state')
def __call__(self):
return self._registry
def _registrar(function):
function._registrar_function = True
return function
class _ExtensionRegistration(object):
"""
Base class for extension class decorators.
"""
def __init__(self):
self._registrars = {}
self._registered_classes = []
for attr, value in vars(self.__class__).items():
try:
is_registrar_function = value._registrar_function
except AttributeError:
is_registrar_function = False
if is_registrar_function:
registrar = _Registrar(registry=getattr(self, attr)())
setattr(self, attr, registrar)
self._registrars[attr] = registrar
def __call__(self, cls):
self._registered_classes.append(cls)
return cls
def init(self):
"""
Initialize all registrars by calling all registered functions.
"""
registered_instances = [cls() for cls in self._registered_classes]
for name, registrar in self._registrars.items():
for instance in registered_instances:
registrating_function = getattr(instance, name, None)
if registrating_function:
registrar.register(registrating_function)
class _ParserExtensionRegistration(_ExtensionRegistration):
"""
Parser extensions class decorator.
"""
@_registrar
def presenter_class(self):
"""
Presentation class registration.
Implementing functions can return a single class or a list/tuple of classes.
"""
return []
@_registrar
def specification_package(self):
"""
Specification package registration.
Implementing functions can return a package name or a list/tuple of names.
"""
return []
@_registrar
def specification_url(self):
"""
Specification URL registration.
Implementing functions should return a dictionary from names to URLs.
"""
return {}
@_registrar
def uri_loader_prefix(self):
"""
URI loader prefix registration.
Implementing functions can return a single prefix or a list/tuple of prefixes.
"""
return collections.StrictList(value_class=basestring)
parser = _ParserExtensionRegistration()
class _ProcessExecutorExtensionRegistration(_ExtensionRegistration):
"""
Process executor extension class decorator.
"""
@_registrar
def decorate(self):
"""
The operation function executed by the process executor will be decorated with the function
returned from ``decorate()``.
"""
return []
process_executor = _ProcessExecutorExtensionRegistration()
def init():
"""
Initialize all registrars by calling all registered functions.
"""
parser.init()
process_executor.init()
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