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46 lines
1.8 KiB
46 lines
1.8 KiB
"""
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This module exists solely to figure how long a registrant/publication
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number may be within an ISBN. The rules change based on the prefix and
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language/region. This list of rules only encapsulates the 978 prefix
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for English books. 978 is the largest and, until recently, the only
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prefix.
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The complete list of prefixes and rules can be found at
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https://www.isbn-international.org/range_file_generation
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"""
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from collections import namedtuple
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from typing import Dict, List
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RegistrantRule = namedtuple("RegistrantRule", ["min", "max", "registrant_length"])
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# Structure: RULES[`EAN Prefix`][`Registration Group`] = [Rule1, Rule2, ...]
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RULES: Dict[str, Dict[str, List[RegistrantRule]]] = {
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"978": {
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"0": [
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RegistrantRule("0000000", "1999999", 2),
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RegistrantRule("2000000", "2279999", 3),
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RegistrantRule("2280000", "2289999", 4),
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RegistrantRule("2290000", "6479999", 3),
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RegistrantRule("6480000", "6489999", 7),
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RegistrantRule("6490000", "6999999", 3),
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RegistrantRule("7000000", "8499999", 4),
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RegistrantRule("8500000", "8999999", 5),
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RegistrantRule("9000000", "9499999", 6),
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RegistrantRule("9500000", "9999999", 7),
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],
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"1": [
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RegistrantRule("0000000", "0999999", 2),
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RegistrantRule("1000000", "3999999", 3),
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RegistrantRule("4000000", "5499999", 4),
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RegistrantRule("5500000", "7319999", 5),
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RegistrantRule("7320000", "7399999", 7),
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RegistrantRule("7400000", "8697999", 5),
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RegistrantRule("8698000", "9729999", 6),
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RegistrantRule("9730000", "9877999", 4),
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RegistrantRule("9878000", "9989999", 6),
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RegistrantRule("9990000", "9999999", 7),
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],
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},
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}
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