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De-lint hybrid36.py

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Nathan Baker
2020-05-24 11:21:55 -07:00
parent a534d97016
commit 95e132e520
2 changed files with 77 additions and 15 deletions
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35
propka/hybrid36.py
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@@ -4,16 +4,21 @@ http://cci.lbl.gov/hybrid_36/
"""
import string
_hybrid36_upper_chars = set(string.ascii_uppercase)
_hybrid36_lower_chars = set(string.ascii_lowercase)
_hybrid36_digits = set(string.digits)
_hybrid36_upper_set = _hybrid36_upper_chars | _hybrid36_digits
_hybrid36_lower_set = _hybrid36_lower_chars | _hybrid36_digits
_HYBRID36_UPPER_CHARS = set(string.ascii_uppercase)
_HYBRID36_LOWER_CHARS = set(string.ascii_lowercase)
_HYBRID36_DIGITS = set(string.digits)
_HYBRID36_UPPER_SET = _HYBRID36_UPPER_CHARS | _HYBRID36_DIGITS
_HYBRID36_LOWER_SET = _HYBRID36_LOWER_CHARS | _HYBRID36_DIGITS
def decode(input_string):
"""
Convert an input string of a number in hybrid-36 format to an integer.
"""Convert an input string of a number in hybrid-36 format to an integer.
Args:
input_string: input string
Returns:
integer
"""
value_error_message = "invalid literal for hybrid-36 conversion: '%s'"
@@ -27,7 +32,7 @@ def decode(input_string):
else:
sign = 1
if not len(input_string):
if len(input_string) == 0:
raise ValueError(value_error_message % input_string)
# See http://cci.lbl.gov/hybrid_36/ for documentation on the format.
@@ -35,21 +40,21 @@ def decode(input_string):
num_chars = len(input_string)
first_char = input_string[0]
if first_char in _hybrid36_digits:
if first_char in _HYBRID36_DIGITS:
return sign * int(input_string)
elif first_char in _hybrid36_upper_chars:
elif first_char in _HYBRID36_UPPER_CHARS:
reference = - (10 * 36 ** (num_chars - 1) - 10 ** num_chars)
_hybrid36_set = _hybrid36_upper_set
elif first_char in _hybrid36_lower_chars:
_hybrid36_set = _HYBRID36_UPPER_SET
elif first_char in _HYBRID36_LOWER_CHARS:
reference = (16 * 36 ** (num_chars - 1) + 10 ** num_chars)
_hybrid36_set = _hybrid36_lower_set
_hybrid36_set = _HYBRID36_LOWER_SET
else:
raise ValueError(value_error_message % original_input_string)
# Check the validity of the input string: ASCII characters should be
# either all uppercase or all lowercase.
for c in input_string[1:]:
if c not in _hybrid36_set:
for char in input_string[1:]:
if char not in _hybrid36_set:
raise ValueError(value_error_message % original_input_string)
# Convert with the int function.