Language Translator

--[[
    HOW THE LANGUAGE WORKS :
        This is inspired by a stupid little 'secret language' my 2nd grade teacher taught me.

        Basically, take a word and iterate through the letters.  If the letter is a vowel,
            then leave it be.  If the letter is not a vowel, add "op" to the end of it.
            For example, "Hi" would result in "HOPi", and "face" would result in "fopacope"

        TODO: add an ignore list with characters such as ".", "?", "!", etc.
]]

local vowels = {
    a = true, e = true, i = true, o = true, u = true
}

local translate = {

    toEnglish = function(words)
        local product = {}
        for letter = 1, words:len() do
            local let = words:sub(letter, letter)
            if words:sub(letter + 1, letter + 2):lower() == "op" then
                table.insert(product, let)
            elseif vowels[let:lower()] and words:sub(letter + 1, letter + 1):lower() ~= "p" then
                table.insert(product, let)
            end
        end
        return table.concat(product)
    end,

    toLanguage = function(words)
        local product = {}
        for letter = 1, words:len() do
            local let = words:sub(letter, letter)
            table.insert(product, let == " " and " " or vowels[let:lower()] and let or let == let:lower() and let .. "op" or let .. "OP")
        end
        return table.concat(product)
    end

}

local to = translate.toLanguage("My name is David")
print(to) --OUTPUT: MOPyop nopamope isop DOPavopidop