wuzilongandCursor
da3ec62719
同质量或体积单位不再要求手填系数，普通 http 页面也能生成幂等操作号。 Co-authored-by: Cursor <cursoragent@cursor.com>
51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
"""证件与计划数量单位都按字典编码比较。历史证面可能直接存了中文标签。"""
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from decimal import Decimal
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_LABEL_TO_CODE = {
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'克': 'g',
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'千克': 'kg',
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'吨': 'dun',
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'升': 'sheng',
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'瓶': 'ping',
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'袋': 'dai',
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'桶': 'tong',
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'毫升': 'hs',
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'套': 'set',
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'个': 'piece',
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'台': 'unit',
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}
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# 同一量纲内的固定比例。数值是该单位折成最小单位后的倍数。
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_MASS_IN_GRAMS = {'g': Decimal(1), 'kg': Decimal(1000), 'dun': Decimal(1000000)}
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_VOLUME_IN_MILLILITRES = {'hs': Decimal(1), 'sheng': Decimal(1000)}
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def canonical_quantity_unit(unit) -> str:
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text = str(unit or '').strip()
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return _LABEL_TO_CODE.get(text, text)
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_CODE_TO_LABEL = {code: label for label, code in _LABEL_TO_CODE.items()}
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def display_quantity_unit(unit) -> str:
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text = str(unit or '').strip()
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code = canonical_quantity_unit(text)
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return _CODE_TO_LABEL.get(code, text or code)
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def same_quantity_unit(left, right) -> bool:
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return canonical_quantity_unit(left) == canonical_quantity_unit(right)
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def standard_conversion_ratio(source_unit, permit_unit):
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"""1 个计划单位等于多少证面单位。同单位、空单位和跨量纲返回 None。"""
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source = canonical_quantity_unit(source_unit)
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permit = canonical_quantity_unit(permit_unit)
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if not source or not permit or source == permit:
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return None
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for table in (_MASS_IN_GRAMS, _VOLUME_IN_MILLILITRES):
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if source in table and permit in table:
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return table[source] / table[permit]
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return None
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