Sha256: 9ddf2635260b5a946c628e9eca3330fd4528f530ff2f3054f1eb6abde183c8dc
Contents?: true
Size: 970 Bytes
Versions: 10
Compression:
Stored size: 970 Bytes
Contents
# frozen_string_literal: true
module StringBase
extend self
KEYS = 'bcdghjklmnpqrstvwxyz'
MULTIPLIER = 99
def encode value
value = value * MULTIPLIER
ring = Hash[KEYS.chars.map.with_index.to_a.map(&:reverse)]
base = KEYS.length
result = []
until value == 0
result << ring[ value % base ]
value /= base
end
result.reverse.join
end
def decode string
ring = Hash[KEYS.chars.map.with_index.to_a]
base = KEYS.length
ret = string.reverse.chars.map.with_index.inject(0) do |sum,(char,i)|
sum + ring[char] * (base**i)
end
raise 'Invalid decode base' if ret%MULTIPLIER>0
ret/MULTIPLIER
end
# extract ID from url
def extract(url_part)
id_str = url_part.split('-').last
return nil unless id_str
StringBase.decode(id_str) rescue nil
end
end
class Integer
def string_id
StringBase.encode self
end
end
class String
def string_id
StringBase.decode self
end
end
Version data entries
10 entries across 10 versions & 1 rubygems