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import typing
class Exports(object):
def __init__(self):
self._exports = {}
self._context_exports = {}
def new_context(self, context: str) -> "ExportsContext":
return ExportsContext(self, context)
def add(self, setting: str, value: typing.Any):
self._add(None, setting, value)
def _context_add(self, context: str, setting: str, value: typing.Any):
self._add(context, setting, value)
def _add(self, context: typing.Optional[str], setting: str,
value: typing.Any):
if context == None:
if not setting in self._exports:
self._exports[setting] = []
self._exports[setting].append(value)
else:
if not context in self._context_exports:
self._context_exports[context] = {}
if not setting in self._context_exports[context]:
self._context_exports[context][setting] = []
self._context_exports[context][setting].append(value)
def get_all(self, setting: str) -> typing.List[typing.Any]:
return self._exports.get(setting, []) + sum([
exports.get(setting, []) for exports in
self._context_exports.values()], [])
def get_one(self, setting: str, default: typing.Any=None
) -> typing.Optional[typing.Any]:
values = self.get_all(setting)
return values[0] if values else None
def purge_context(self, context: str):
if context in self._context_exports:
del self._context_exports[context]
class ExportsContext(object):
def __init__(self, parent: Exports, context: str):
self._parent = parent
self.context = context
def add(self, setting: str, value: typing.Any):
self._parent._context_add(self.context, setting, value)
def get_all(self, setting: str) -> typing.List[typing.Any]:
return self._parent.get_all(setting)
def get_one(self, setting: str, default: typing.Any=None
) -> typing.Optional[typing.Any]:
return self._parent.get_one(setting, default)
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