Contents

local alphabet = 'abcdefghijklmnopqrstuvwxyz'
local decoder_ring = setmetatable({}, { __index = function() return '' end })

for i = 1, #alphabet do
  decoder_ring[alphabet:sub(i, i)] = alphabet:reverse():sub(i, i)
end

for i = 0, 9 do
  decoder_ring[tostring(i)] = tostring(i)
end

local function transcribe(plaintext)
  return plaintext:lower():gsub('.', decoder_ring)
end

local function split_chunks(s)
  local chunks = {}
  s:gsub('..?.?.?.?', function(chunk)
    table.insert(chunks, chunk)
  end)
  return table.concat(chunks, ' ')
end

return {
  encode = function(plaintext)
    return split_chunks(transcribe(plaintext))
  end
}

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.179	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.178	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.177	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.176	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.175	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.174	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.173	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.172	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.171	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.170	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.169	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.167	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.166	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.165	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.164	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.163	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.162	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.161	tracks/lua/exercises/atbash-cipher/example.lua
trackler-2.2.1.160	tracks/lua/exercises/atbash-cipher/example.lua