85 lines
1.7 KiB
Python
85 lines
1.7 KiB
Python
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"""Comparison functions"""
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from enum import Enum
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from typing import Any, List, Literal, Optional
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class Cmp(Enum):
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"""Comparison results"""
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LT = -1
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EQ = 0
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GT = 1
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def deep_compare(val_a: Any, val_b: Any) -> Cmp:
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"""Compare two dictionaries key by key"""
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if isinstance(val_a, dict):
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for key, elem_a in val_a.items():
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elem_b = val_b[key]
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cmp = deep_compare(elem_a, elem_b)
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if cmp == Cmp.EQ:
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continue
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return cmp
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return compare_arrays(list(val_a.keys()), list(val_b.keys()))
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if val_a > val_b:
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return Cmp.GT
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if val_a < val_b:
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return Cmp.LT
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return Cmp.EQ
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def compare_basic(val_a: Any, val_b: Any, order: Literal['ASC', 'DESC'] = 'ASC') -> Cmp:
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"""Compare two basic values"""
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cmp = deep_compare(val_a, val_b)
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if cmp == Cmp.EQ:
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return Cmp.EQ
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if order == 'ASC':
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return cmp
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return Cmp.LT if cmp == Cmp.GT else Cmp.GT
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def compare_arrays(
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arr_a: List[Any],
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arr_b: List[Any],
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sort_orders: Optional[List[Literal['ASC', 'DESC']]] = None,
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) -> Cmp:
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"""Compare two arrays"""
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sort_orders = sort_orders or []
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for idx, (elem_a, elem_b) in enumerate(zip(arr_a, arr_b)):
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try:
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sort_order = sort_orders[idx]
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except IndexError:
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sort_order = 'ASC'
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elem_cmp = compare_basic(elem_a, elem_b, sort_order)
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if elem_cmp != Cmp.EQ:
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return elem_cmp
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if len(arr_a) == len(arr_b):
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return Cmp.EQ
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idx = min(len(arr_a), len(arr_b))
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try:
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sort_order = sort_orders[idx]
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except IndexError:
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sort_order = 'ASC'
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return compare_basic(len(arr_a), len(arr_b), sort_order)
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