Rot13 in Lua (original) (raw)

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4. Rot13 in Lua

Published on 18 October 2019 (Updated: 15 October 2020)

Welcome to the Rot13 in Lua page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

local function ascii_base(s)
  return s:lower() == s and ('a'):byte() or ('A'):byte()
end

function caesar_cipher(str, key)
  return (str:gsub('%a', function(s)
    local base = ascii_base(s)
    return string.char(((s:byte() - base + key) % 26) + base)
  end))
end

if (#arg < 1 or arg[1] == "")
then
    print('Usage: please provide a string to encrypt')
else
    io.write(caesar_cipher(arg[1], 13))
end

io.write("\n")

Rot13 in Lua was written by:

• Alex Gustafsson
• Jeremy Grifski

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.