| 7 | |
| 8 | |
| 9 | class _ContextInfo: |
| 10 | def __init__(self, cls, allow_default): |
| 11 | self.cls = cls |
| 12 | self.allow_default = allow_default |
| 13 | self._local_stack = threading.local() |
| 14 | |
| 15 | @property |
| 16 | def _stack(self): |
| 17 | if not hasattr(self._local_stack, 'obj'): |
| 18 | self._local_stack.obj = [] |
| 19 | return self._local_stack.obj |
| 20 | |
| 21 | def enter(self, value): |
| 22 | self._stack.append(value) |
| 23 | |
| 24 | def exit(self, value): |
| 25 | assert len(self._stack) > 0, 'Context %s is empty.' % self.cls |
| 26 | assert self._stack.pop() == value |
| 27 | |
| 28 | def get_active(self, required=True): |
| 29 | if len(self._stack) == 0: |
| 30 | if not required: |
| 31 | return None |
| 32 | assert self.allow_default, ( |
| 33 | 'Context %s is required but none is active.' % self.cls) |
| 34 | self.enter(self.cls()) |
| 35 | return self._stack[-1] |
| 36 | |
| 37 | |
| 38 | class _ContextRegistry: |
no outgoing calls
no test coverage detected
searching dependent graphs…