[Challenge] Rainbow BBCode Generator

[The Unintelligible]

Today I'll be posting up another programming challenge. This one will be slightly more difficult than the last, so I hope you're ready. This one will probably be more fun as well since it's a challenge I thought of completely.

I'll get straight to the point.

Criteria:

-Define a function or procedure that takes as input a string that you will convert to arbitrary "rainbow" BBCode. Optionally, throw in an option to specify the size of your generated output.

Subjective difficulty: Easy.
As a bonus, reward is 3x +rep from me.

As before, post your code in this thread (preferably enclosed in [spoiler] tags by convention).
No deadline. Feel free to do this anytime.
Any programming language of your choice can be used.

My solution in Lua:

Spoiler:

 #!/usr/bin/env lua

--------------------------------------------------------------
-- @Description: Pedagogical Lua script to color code your text using arbitrary "rainbow" BBCode
-- @Author: Forget Me Not (The Unintelligible)
-- @Contact: xxprotozoid@live.com

-- @Version: v0.1

-- @Remarks: Primarily intended for Windows use. However, due to the fact that it's distributed free,
--           as in freedom, you are able to safely modify and re-distribute this script free of charge
--           as long as it abides by the GPLv2 terms.

-- @Dependencies: clipboard DLL module - http://files.luaforge.net/releases/jaslatrix/clipboard/1.0.0/clipboard-1.0.0-Lua51.zip

-- @License: GNU General Public License v2 (GPLv2) - http://www.gnu.org/copyleft/gpl.html
--------------------------------------------------------------

require "clipboard"

----------------------------------------------
--- Internal methods
----------------------------------------------

--- Returns Lua table from tokenized string
-- @param s Lua string to pass as input
-- @usage tokenize("I am a string")
local function tokenize(s)
    local t = {}

    for i = 1,#s do
        t[i] = s:sub(i, i)
    end

    return t
end

--- Returns string color coded in rainbow BBCode and corresponding size
-- @param s Lua string to pass as input
-- @param size Lua number for the size of the text to output
-- @usage color_code("Lorem ipsum dolor sit amet, consectetur, adipisci velit.")
local function color_code(s, size)
    local bool, err = assert(type(s) == "string", "Invalid data supplied.")  -- If given data not string, throw an exception & terminate our function

    if (not bool) then return end

    local char_array = tokenize(s)
    local buff = ""

    for i = 1, #char_array do
        -- Create a matrix of hues of the different colors of the rainbow
        -- Each row is as follows: Red, Orange, Yellow, Green, Blue, Purple
        local color_matrix = {
            "#C11B17", "#F87A17", "#FFFF00", "#00FF00", "#2B60DE","#893BFF",
            "#F63817", "#E78E17", "#FFFC17", "#5EFB6E", "#1531EC", "#8E35EF"
        }

        local ran_num = math.random(1, #color_matrix) -- Create a pseudo-random number ranging from 1 to the size of the color matrix
        local color = color_matrix[ran_num]

        if (string.find(char_array[i], ' ')) then whitespace = true end

        if (not whitespace) then -- For resource conservation, we won't enclose whitespace in BBCode
            bbcode_str = "[color=" .. color .. "]" .. char_array[i] .. "[/color]"
        end


        if (whitespace) then -- If whitespace is in our token we'll simply leave it as is. Else we wrap it up with BBCode
            buff = buff .. char_array[i]
        else
            buff = buff .. bbcode_str
        end

        whitespace = false
    end

    if (not size) then size = 3 end -- If no size parameter passed, defaults to 3

    buff = "[size=" .. tostring(size) .. "]".. buff .. "[/size]" -- Finalize process by prepending and appending size tags to our string

    return buff, #buff
end

----------------------------------------------
--- Main program
----------------------------------------------

local function main()
    io.write("Enter your text to be color-coded: ") -- Prompt user to feed input to program for our process
    input_text = io.read() -- Wait for input from the STDIN/STDOUT stream

    -- Rinse, repeat
    io.write("Now enter your size attribute for the text: ")
    input_size = io.read()

    print("Now initializing the process...\n") -- Print out user-friendly message while the process unfolds under the hood

    result = color_code(input_text, input_size)

    clipboard.settext(result)

    print("Done! Your legendary rainbow text has been copied to your clipboard.\n\nPress enter to exit.\n") -- Done!
    io.read() -- Idle
end

main() 
  

For better viewing, here it is on github.

https://gist.github.com/3351178

My algorithm is pretty straightforward and crude, but hey, it works. I was going trk on it a little more to expand on it, but meh.

I've also included a conventional release as an attachment that includes an executable and the source code for those of you who are interested.

I strongly implore you all to take a shot at this challenge. I'm curious to see all the different solutions out there.

Note: I was unable to post this in the programming puzzle section, so if you could do your thing Artificial that would be great.


Good luck, guys.

Download: rainbow.zip

[Artificial]

Is this what you wanted?

Spoiler:

https://gist.github.com/3360969

Result:
Hello my name is Alex/Artificial. I'm just testing the convert function.

Sitting in a lecture trying to pay attention while coding it. I just realised I haven't picked up anything in the last 10 minutes! Thanks for disrupting my education! lol

[The Unintelligible]

Is this what you wanted?

Spoiler:

https://gist.github.com/3360969

Result:
Hello my name is Alex/Artificial. I'm just testing the convert function.

Sitting in a lecture trying to pay attention while coding it. I just realised I haven't picked up anything in the last 10 minutes! Thanks for disrupting my education! lol

I laughed.

But nice work. Elegant solution as always.

Enjoy your rep! lol.

[The Unintelligible]

Thought I'd post this here for those of you who were confused by my solution.

[Artificial]

Ah, ok. That's even easier. Just get rid of my divider() method and replace it with random.randrange(0, len(self.colours())