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# Description:
# Base36 encoding and decoding
#
# Dependencies:
# None
#
# Configuration:
# None
#
# Commands:
# hubot base36 e(ncode)|d(ecode) <query> - Base36 encode or decode <query>
#
# Author:
# plytro
module.exports = (robot) ->
robot.hear /base36 e(ncode)?( me)? (.*)/i, (msg) ->
try
msg.send Base36.encode(msg.match[3])
catch e
throw e unless e.message == 'Value passed is not an integer.'
msg.send "Base36 encoding only works with Integer values."
robot.hear /base36 d(ecode)?( me)? (.*)/i, (msg) ->
try
msg.send (String) Base36.decode(msg.match[3])
catch e
throw e unless e.message == 'Value passed is not a valid Base36 string.'
msg.send "Not a valid base36 encoded string."
class Base36Builder
constructor: ->
@alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"
@base = @alphabet.length
encode: (num) ->
throw new Error('Value passed is not an integer.') unless /^\d+$/.test num
num = parseInt(num) unless typeof num == 'number'
str = ''
while num >= @base
mod = num % @base
str = @alphabet[mod] + str
num = (num - mod)/@base
@alphabet[num] + str
decode: (str) ->
num = 0
for char, index in str.split(//).reverse()
if (char_index = @alphabet.indexOf(char)) == -1
throw new Error('Value passed is not a valid Base36 string.')
num += char_index * Math.pow(@base, index)
num
Base36 = new Base36Builder()
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