Printable Chars

Simple lib for getting the printable ascii characters of a lua string

Example Usage

local printable_chars = require "printable_chars".printable_chars

-- Print random characters from urandom
local urandom = io:open("/dev/urandom", "r")
print(printable_chars(urandom:read(32)))                           -- U&0j]s7\]r9\ (Example)
urandom:close()

-- Validate fields
local raw_password = "çç~asdasdasd  \n\n\r\tasdáá"
if raw_password ~= printable_chars(raw_password) then              -- True
    print("Do not use invalid ascii characters in the password")
end

Check spec file for more examples

Available methods

• printable_chars - Returns string with just the ascii printable characters
• is_char_printable - Checks if a char is printable
• set_spaces_allowed - Sets the lib to accept special space chars as printable chars
• blacklist_chars - Blacklists a list of specific chars so the next printable_chars calls will ignore them

Testing

To run the unit tests we need the busted lib.

luarocks install busted

After that just run the following command.

busted spec

Instalation

luarocks install printable_chars