| 48 | |
| 49 | |
| 50 | class Canary: |
| 51 | def __init__(self): |
| 52 | self.data = set() |
| 53 | self.added = set() |
| 54 | self.removed = set() |
| 55 | self.appended_wo_mutation = set() |
| 56 | self.dupe_check = True |
| 57 | |
| 58 | @contextlib.contextmanager |
| 59 | def defer_dupe_check(self): |
| 60 | self.dupe_check = False |
| 61 | try: |
| 62 | yield |
| 63 | finally: |
| 64 | self.dupe_check = True |
| 65 | |
| 66 | def listen(self, attr): |
| 67 | event.listen(attr, "append", self.append) |
| 68 | event.listen(attr, "append_wo_mutation", self.append_wo_mutation) |
| 69 | event.listen(attr, "remove", self.remove) |
| 70 | event.listen(attr, "set", self.set) |
| 71 | |
| 72 | def append(self, obj, value, initiator): |
| 73 | if self.dupe_check: |
| 74 | assert value not in self.added |
| 75 | self.added.add(value) |
| 76 | self.data.add(value) |
| 77 | return value |
| 78 | |
| 79 | def append_wo_mutation(self, obj, value, initiator): |
| 80 | if self.dupe_check: |
| 81 | assert value in self.added |
| 82 | self.appended_wo_mutation.add(value) |
| 83 | |
| 84 | def remove(self, obj, value, initiator): |
| 85 | if self.dupe_check: |
| 86 | assert value not in self.removed |
| 87 | self.removed.add(value) |
| 88 | self.data.remove(value) |
| 89 | |
| 90 | def set(self, obj, value, oldvalue, initiator): |
| 91 | if isinstance(value, str): |
| 92 | value = CollectionsTest.entity_maker() |
| 93 | |
| 94 | if oldvalue is not None: |
| 95 | self.remove(obj, oldvalue, None) |
| 96 | self.append(obj, value, None) |
| 97 | return value |
| 98 | |
| 99 | |
| 100 | class OrderedDictFixture: |
no outgoing calls