"""
Main module for the keypad entry problem.

Usage: 
$ python keypad.py
> 0405683056830687420
> ...
> ^D
$

Author: Rodney Topor
Date: November 2007
Last updated: 1 August 2011
"""

import string
from re import split
from sys import stdin

from keypad_dict import add_word, get_words


def read_dictionary():
    """Read a sequence of words from file word.list into a dictionary."""
    try:
        file = open('word.list', 'r')
    except:
        print "Cannot open file word.list.  Exiting."
        return False
    for line in file:
        for word in line.split():
            add_word(word)
    file.close()
    return True
    
    
def read_messages():
    """
    Read, translate and print a sequence of numeric messages from stdin.
    """
    prompt = "> "
    print prompt,
    line = stdin.readline()
    while (line != ""):
        digitsSeq = split('0+', line.strip('0\n'))
        print " ".join([ format(get_words(digits)) for digits in digitsSeq ])
        print prompt,
        line = stdin.readline() 
        
	
def format(words):
    """Parenthesise word lists of length greater than 1."""
    if (len(words) == 1):
        return words[0]
    else:
        return "(" + "|".join(words) + ")"
        
	
if __name__ == "__main__":
    if (read_dictionary()):
        read_messages()