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"""IBAN."""
# standard
import re
# local
from .utils import validator
def _char_value(char: str):
"""A=10, B=11, ..., Z=35."""
return char if char.isdigit() else str(10 + ord(char) - ord("A"))
def _mod_check(value: str):
"""Check if the value string passes the mod97-test."""
# move country code and check numbers to end
rearranged = value[4:] + value[:4]
return int("".join(_char_value(char) for char in rearranged)) % 97 == 1
@validator
def iban(value: str, /):
"""Return whether or not given value is a valid IBAN code.
Examples:
>>> iban('DE29100500001061045672')
# Output: True
>>> iban('123456')
# Output: ValidationError(func=iban, ...)
Args:
value:
IBAN string to validate.
Returns:
(Literal[True]): If `value` is a valid IBAN code.
(ValidationError): If `value` is an invalid IBAN code.
"""
return (
(re.match(r"^[a-z]{2}[0-9]{2}[a-z0-9]{11,30}$", value, re.IGNORECASE) and _mod_check(value))
if value
else False
)