Converts mc chat codes to bbcode syntax

codes2bb.py

import sys

COLOURS = {
    "0": "000000",
    "1": "0000aa",
    "2": "00aa00",
    "3": "00aaaa",
    "4": "aa0000",
    "5": "aa00aa",
    "6": "aa5500",
    "7": "aaaaaa",
    "8": "555555",
    "9": "5555ff",
    "a": "55ff55",
    "b": "55ffff",
    "c": "ff5555",
    "d": "ff55ff",
    "e": "ffff55",
    "f": "ffffff",
}

COLOR = 1
BOLD = 2
ITALIC = 3
UNDERLINE = 4
STRIKE = 5

def opening(tag):
    if tag == COLOR:
        return "[color]"
    elif tag == BOLD:
        return "[b]"
    elif tag == ITALIC:
        return "[i]"
    elif tag == UNDERLINE:
        return "[u]"
    elif tag == STRIKE:
        return "[s]"

def closing(tag):
    if tag == COLOR:
        return "[/color]"
    elif tag == BOLD:
        return "[/b]"
    elif tag == ITALIC:
        return "[/i]"
    elif tag == UNDERLINE:
        return "[/u]"
    elif tag == STRIKE:
        return "[/s]"

def convert(input):
    is_code = False
    output = ""
    
    tags = []
    
    for c in input:
        if is_code:
            is_code = False
            
            if c in COLOURS:
                l = []
                
                if COLOR in tags:
                    while tags[-1] != COLOR:
                        t = tags.pop(-1)
                        
                        l.insert(0, t)
                        output += closing(t)
                    
                    tags.pop(-1)
                    output += "[/color]"
                
                tags.append(COLOR)
                output += "[color=#%s]" % COLOURS[c]
                
                for t in l:
                    tags.append(t)
                    output += opening(t)
            
            elif c == "k":
                pass
            
            elif c == "l":
                if BOLD not in tags:
                    tags.append(BOLD)
                    output += opening(BOLD)
            
            elif c == "m":
                if STRIKE not in tags:
                    tags.append(STRIKE)
                    output += opening(STRIKE)
            
            elif c == "n":
                if UNDERLINE not in tags:
                    tags.append(UNDERLINE)
                    output += opening(UNDERLINE)
            
            elif c == "o":
                if ITALIC not in tags:
                    tags.append(ITALIC)
                    output += opening(ITALIC)
            
            elif c == "r":
                for t in reversed(tags):
                    output += closing(t)
                
                tags = []
            
            else:
                output += "&" + c
        
        elif c == "&":
            is_code = True
        
        else:
            output += c
    
    for t in reversed(tags):
        output += closing(t)
    
    return output

if __name__ == "__main__":
    print "Enter input, end with a line '===' to convert and exit"
    
    input = ""
    while True:
        line = raw_input("> ")
        if line == "===":
            break
        
        input += line + "\n"
    
    print convert(input)