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"""Finance."""
from .utils import validator
def _cusip_checksum(cusip: str):
check, val = 0, None
for idx in range(9):
c = cusip[idx]
if c >= "0" and c <= "9":
val = ord(c) - ord("0")
elif c >= "A" and c <= "Z":
val = 10 + ord(c) - ord("A")
elif c >= "a" and c <= "z":
val = 10 + ord(c) - ord("a")
elif c == "*":
val = 36
elif c == "@":
val = 37
elif c == "#":
val = 38
else:
return False
if idx & 1:
val += val
check = check + (val // 10) + (val % 10)
return (check % 10) == 0
def _isin_checksum(value: str):
check, val = 0, None
for idx in range(12):
c = value[idx]
if c >= "0" and c <= "9" and idx > 1:
val = ord(c) - ord("0")
elif c >= "A" and c <= "Z":
val = 10 + ord(c) - ord("A")
elif c >= "a" and c <= "z":
val = 10 + ord(c) - ord("a")
else:
return False
if idx & 1:
val += val
return (check % 10) == 0
@validator
def cusip(value: str):
"""Return whether or not given value is a valid CUSIP.
Checks if the value is a valid [CUSIP][1].
[1]: https://en.wikipedia.org/wiki/CUSIP
Examples:
>>> cusip('037833DP2')
True
>>> cusip('037833DP3')
ValidationError(func=cusip, args={'value': '037833DP3'})
Args:
value: CUSIP string to validate.
Returns:
(Literal[True]): If `value` is a valid CUSIP string.
(ValidationError): If `value` is an invalid CUSIP string.
"""
return len(value) == 9 and _cusip_checksum(value)
@validator
def isin(value: str):
"""Return whether or not given value is a valid ISIN.
Checks if the value is a valid [ISIN][1].
[1]: https://en.wikipedia.org/wiki/International_Securities_Identification_Number
Examples:
>>> isin('037833DP2')
ValidationError(func=isin, args={'value': '037833DP2'})
>>> isin('037833DP3')
ValidationError(func=isin, args={'value': '037833DP3'})
Args:
value: ISIN string to validate.
Returns:
(Literal[True]): If `value` is a valid ISIN string.
(ValidationError): If `value` is an invalid ISIN string.
"""
return len(value) == 12 and _isin_checksum(value)
@validator
def sedol(value: str):
"""Return whether or not given value is a valid SEDOL.
Checks if the value is a valid [SEDOL][1].
[1]: https://en.wikipedia.org/wiki/SEDOL
Examples:
>>> sedol('2936921')
True
>>> sedol('29A6922')
ValidationError(func=sedol, args={'value': '29A6922'})
Args:
value: SEDOL string to validate.
Returns:
(Literal[True]): If `value` is a valid SEDOL string.
(ValidationError): If `value` is an invalid SEDOL string.
"""
if len(value) != 7:
return False
weights = [1, 3, 1, 7, 3, 9, 1]
check = 0
for idx in range(7):
c = value[idx]
if c in "AEIOU":
return False
val = None
if c >= "0" and c <= "9":
val = ord(c) - ord("0")
elif c >= "A" and c <= "Z":
val = 10 + ord(c) - ord("A")
else:
return False
check += val * weights[idx]
return (check % 10) == 0