116 lines
3.2 KiB
Python
116 lines
3.2 KiB
Python
|
# RemovedInDjango50Warning
|
||
|
|
# Copyright (c) 2010 Guilherme Gondim. All rights reserved.
|
||
|
|
# Copyright (c) 2009 Simon Willison. All rights reserved.
|
||
|
|
# Copyright (c) 2002 Drew Perttula. All rights reserved.
|
||
|
|
#
|
||
|
|
# License:
|
||
|
|
# Python Software Foundation License version 2
|
||
|
|
#
|
||
|
|
# See the file "LICENSE" for terms & conditions for usage, and a DISCLAIMER OF
|
||
|
|
# ALL WARRANTIES.
|
||
|
|
#
|
||
|
|
# This Baseconv distribution contains no GNU General Public Licensed (GPLed)
|
||
|
|
# code so it may be used in proprietary projects just like prior ``baseconv``
|
||
|
|
# distributions.
|
||
|
|
#
|
||
|
|
# All trademarks referenced herein are property of their respective holders.
|
||
|
|
#
|
||
|
|
|
||
|
|
"""
|
||
|
|
Convert numbers from base 10 integers to base X strings and back again.
|
||
|
|
|
||
|
|
Sample usage::
|
||
|
|
|
||
|
|
>>> base20 = BaseConverter('0123456789abcdefghij')
|
||
|
|
>>> base20.encode(1234)
|
||
|
|
'31e'
|
||
|
|
>>> base20.decode('31e')
|
||
|
|
1234
|
||
|
|
>>> base20.encode(-1234)
|
||
|
|
'-31e'
|
||
|
|
>>> base20.decode('-31e')
|
||
|
|
-1234
|
||
|
|
>>> base11 = BaseConverter('0123456789-', sign='$')
|
||
|
|
>>> base11.encode(-1234)
|
||
|
|
'$-22'
|
||
|
|
>>> base11.decode('$-22')
|
||
|
|
-1234
|
||
|
|
|
||
|
|
"""
|
||
|
|
import warnings
|
||
|
|
|
||
|
|
from django.utils.deprecation import RemovedInDjango50Warning
|
||
|
|
|
||
|
|
warnings.warn(
|
||
|
|
"The django.utils.baseconv module is deprecated.",
|
||
|
|
category=RemovedInDjango50Warning,
|
||
|
|
stacklevel=2,
|
||
|
|
)
|
||
|
|
|
||
|
|
BASE2_ALPHABET = "01"
|
||
|
|
BASE16_ALPHABET = "0123456789ABCDEF"
|
||
|
|
BASE56_ALPHABET = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz"
|
||
|
|
BASE36_ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyz"
|
||
|
|
BASE62_ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
|
||
|
|
BASE64_ALPHABET = BASE62_ALPHABET + "-_"
|
||
|
|
|
||
|
|
|
||
|
|
class BaseConverter:
|
||
|
|
decimal_digits = "0123456789"
|
||
|
|
|
||
|
|
def __init__(self, digits, sign="-"):
|
||
|
|
self.sign = sign
|
||
|
|
self.digits = digits
|
||
|
|
if sign in self.digits:
|
||
|
|
raise ValueError("Sign character found in converter base digits.")
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return "<%s: base%s (%s)>" % (
|
||
|
|
self.__class__.__name__,
|
||
|
|
len(self.digits),
|
||
|
|
self.digits,
|
||
|
|
)
|
||
|
|
|
||
|
|
def encode(self, i):
|
||
|
|
neg, value = self.convert(i, self.decimal_digits, self.digits, "-")
|
||
|
|
if neg:
|
||
|
|
return self.sign + value
|
||
|
|
return value
|
||
|
|
|
||
|
|
def decode(self, s):
|
||
|
|
neg, value = self.convert(s, self.digits, self.decimal_digits, self.sign)
|
||
|
|
if neg:
|
||
|
|
value = "-" + value
|
||
|
|
return int(value)
|
||
|
|
|
||
|
|
def convert(self, number, from_digits, to_digits, sign):
|
||
|
|
if str(number)[0] == sign:
|
||
|
|
number = str(number)[1:]
|
||
|
|
neg = 1
|
||
|
|
else:
|
||
|
|
neg = 0
|
||
|
|
|
||
|
|
# make an integer out of the number
|
||
|
|
x = 0
|
||
|
|
for digit in str(number):
|
||
|
|
x = x * len(from_digits) + from_digits.index(digit)
|
||
|
|
|
||
|
|
# create the result in base 'len(to_digits)'
|
||
|
|
if x == 0:
|
||
|
|
res = to_digits[0]
|
||
|
|
else:
|
||
|
|
res = ""
|
||
|
|
while x > 0:
|
||
|
|
digit = x % len(to_digits)
|
||
|
|
res = to_digits[digit] + res
|
||
|
|
x = int(x // len(to_digits))
|
||
|
|
return neg, res
|
||
|
|
|
||
|
|
|
||
|
|
base2 = BaseConverter(BASE2_ALPHABET)
|
||
|
|
base16 = BaseConverter(BASE16_ALPHABET)
|
||
|
|
base36 = BaseConverter(BASE36_ALPHABET)
|
||
|
|
base56 = BaseConverter(BASE56_ALPHABET)
|
||
|
|
base62 = BaseConverter(BASE62_ALPHABET)
|
||
|
|
base64 = BaseConverter(BASE64_ALPHABET, sign="$")
|