Coverage for src/objectstate/value_semantics.py: 88%

1"""Shared value comparison semantics for declaration and state reconciliation.""" 

2 

3from __future__ import annotations 

4 

5from collections.abc import Mapping, Sequence 

6 

7 

8def semantic_values_equal(left: object, right: object) -> bool: 

9 """Compare nested values without requiring hashability or scalar equality.""" 

10 

11 if left is right: 

12 return True 

13 if isinstance(left, Mapping) and isinstance(right, Mapping): 

14 return left.keys() == right.keys() and all( 

15 semantic_values_equal(left[key], right[key]) for key in left 

16 ) 

17 if ( 

18 isinstance(left, Sequence) 

19 and isinstance(right, Sequence) 

20 and not isinstance(left, (str, bytes, bytearray)) 

21 and not isinstance(right, (str, bytes, bytearray)) 

22 ): 

23 return len(left) == len(right) and all( 

24 semantic_values_equal(left_value, right_value) 

25 for left_value, right_value in zip(left, right) 

26 ) 

27 try: 

28 comparison = left == right 

29 except Exception: 

30 return False 

31 try: 

32 return bool(comparison) 

33 except (TypeError, ValueError): 

34 return False