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64 lines
1.9 KiB
64 lines
1.9 KiB
6 months ago
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import re
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from string import ascii_uppercase
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from .. import BaseProvider, ElementsType
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localized = True
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def calculate_vin_str_weight(s: str, weight_factor: list) -> int:
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"""
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multiply s(str) by weight_factor char by char
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e.g.
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input: s="ABCDE", weight_factor=[1, 2, 3, 4, 5]
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return: A*1 + B*2 + C*3 + D*4 + E*5
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will multiply 0 when len(weight_factor) less than len(s)
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"""
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def _get_char_weight(c: str) -> int:
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"""A=1, B=2, ...., I=9,
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J=1, K=2, ..., R=9,
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S=2, T=3, ..., Z=9
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"""
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if ord(c) <= 64: # 0-9
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return int(c)
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if ord(c) <= 73: # A-I
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return ord(c) - 64
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if ord(c) <= 82: # J-R
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return ord(c) - 73
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# S-Z
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return ord(c) - 81
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res = 0
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for i, c in enumerate(s):
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res += _get_char_weight(c) * weight_factor[i] if i < len(weight_factor) else 0
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return res
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class Provider(BaseProvider):
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"""Implement default automotive provider for Faker."""
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license_formats: ElementsType = ()
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def license_plate(self) -> str:
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"""Generate a license plate."""
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temp = re.sub(
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r"\?",
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lambda x: self.random_element(ascii_uppercase),
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self.random_element(self.license_formats),
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)
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return self.numerify(temp)
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def vin(self) -> str:
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"""Generate vin number."""
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vin_chars = "1234567890ABCDEFGHJKLMNPRSTUVWXYZ" # I, O, Q are restricted
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front_part = self.bothify("????????", letters=vin_chars)
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rear_part = self.bothify("????????", letters=vin_chars)
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front_part_weight = calculate_vin_str_weight(front_part, [8, 7, 6, 5, 4, 3, 2, 10])
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rear_part_weight = calculate_vin_str_weight(rear_part, [9, 8, 7, 6, 5, 4, 3, 2])
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checksum = (front_part_weight + rear_part_weight) % 11
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checksum_char = "X" if checksum == 10 else str(checksum)
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return front_part + checksum_char + rear_part
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