Created
March 26, 2012 14:44
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base 62 encoding in ruby
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| ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" | |
| def base62_encode(num, alphabet=ALPHABET) | |
| return alphabet[0] if num == 0 | |
| arr = [] | |
| base = alphabet.size | |
| while num > 0 do | |
| rem = num % base | |
| num = num / base | |
| arr << alphabet[rem] | |
| end | |
| arr.reverse | |
| return arr.join | |
| end | |
| def base62_decode(string, alphabet=ALPHABET) | |
| base = alphabet.size | |
| strlen = string.size | |
| num = 0 | |
| idx = 0 | |
| string.each_char do |char| | |
| power = (strlen - (idx + 1)) | |
| num += alphabet.index(char) * (base ** power) | |
| idx += 1 | |
| end | |
| return num | |
| end | |
| puts base62_encode(128) | |
| puts base62_decode("1F3") |
Author
gleicon
commented
Mar 26, 2012
via email
foi feito para não rodar testes.
fiz uma versao com monkey patch https://gist.github.com/2209621
puts i.to_base62.from_base62
puts c.from_base62.to_base62
1F3
4777
4777
1F3
##
More Cowbell
…On Monday, March 26, 2012 at 5:55 PM, Juan Lopes wrote:
Acho que esse código está errado:
Os testes abaixo não passam
base62_decode(base62_encode(128)).should == 128
base62_encode(base62_decode("1F3")).should == "1F3"
Fiz uma versão usando um approach mais funcional
https://gist.github.com/2209601
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