Techlooper Contest - Decode Braille

techlooper_contest.rb

#!/usr/bin/env ruby
# Reference: http://www.loc.gov/nls/reference/braille/card.html
# Contest: http://techlooper.com/#/contest
# HuyNQ

braille_alphabet= [
    '0.....',
    '0.0...',
    '00....',
    '00.0..',
    '0..0..',
    '000...',
    '0000..',
    '0.00..',
    '.00...',
    '.000..',
    '0...0.',
    '0.0.0.',
    '00..0.',
    '00.00.',
    '0..00.',
    '000.0.',
    '00000.',
    '0.000.',
    '.00.0.',
    '.0000.',
    '0...00',
    '0.0.00',
    '.000.0',
    '00..00',
    '00.000',
    '0..000',
    '......',
    '..00.0'
]

CAP = '.....0'
ASTERISK = '.0.000'

alphabet = 'abcdefghijklmnopqrstuvwxyz .'.split('')

encoded = %(0...00
......
0.000.
......
.00.0.
00..0.
0.....
0.000.
.0000.
..00.0
......
.....0
.00.0.
0..0..
00.00.
00.0..
......
0..0..
00..0.
0.....
.00...
0.0.0.
......
.0.000
0.0...
......
00....
0..00.
00.0..
0..0..
......
0.....
.0000.
......
0.0.00
.00...
0..0..
.0000.
00.00.
0.....
00..0.
.000.0
0..00.
0.000.
0...0.
.00.0.
..00.0
00....
0..00.
00..0.
......
.0.000
00.0..
......
.00...
00.00.
.00.0.
.0000.
0.000.
0...00
00....
.0000.
.00...
0..00.
00.00.
.00.0.).split("\n")

braille_dict = Hash[braille_alphabet.zip(alphabet)]

decoded = []
encoded.each_with_index do |e, i|
  decoded <<
  if (encoded[i  - 1] == ASTERISK)
    braille_alphabet.index(e) + 1
  elsif encoded[i - 1] == CAP
    braille_dict[e].capitalize
  else
    braille_dict[e]
  end
end

p decoded.join

# >> "u r smart. Send email 2 code at vietnamworks.com 4 instructions"