Famarkov: A Markov Bot for IRC Logs

famarkov.py

# FamiLAB Markov Chain Generator
# based on: http://agiliq.com/blog/2009/06/generating-pseudo-random-text-with-markov-chains-u/


import random
import re

IRC_PATTERN = r"(.*)\<(.*)\>(.*)"


class Markov(object):

    def __init__(self, open_file):
        self.cache = {}
        self.open_file = open_file
        self.words = self.file_to_words()
        self.word_size = len(self.words)
        self.database()

    def file_to_words(self):
        self.open_file.seek(0)
        data = self.open_file.read()
        words = self.strip_irc(data).split()
        return words

    def strip_irc(self, data_str):
        prog = re.compile(IRC_PATTERN)
        w = ""

        for line in data_str.split('\n'):
            result = prog.match(line)
            if result is not None:
                w = w + ' ' + result.group(3)
        return w
        
    def triples(self):
        """ Generates triples from the given data string. So if our string were
                "What a lovely day", we'd generate (What, a, lovely) and then
                (a, lovely, day).
        """

        if len(self.words) < 3:
            return

        for i in range(len(self.words) - 2):
            yield (self.words[i], self.words[i+1], self.words[i+2])

    def database(self):
        for w1, w2, w3 in self.triples():
            key = (w1, w2)
            if key in self.cache:
                self.cache[key].append(w3)
            else:
                self.cache[key] = [w3]

    def generate_markov_text(self, size=25):
        seed = random.randint(0, self.word_size-3)
        seed_word, next_word = self.words[seed], self.words[seed+1]
        w1, w2 = seed_word, next_word
        gen_words = []
        for i in xrange(size):
            gen_words.append(w1)
            w1, w2 = w2, random.choice(self.cache[(w1, w2)])
        gen_words.append(w2)
        return ' '.join(gen_words)


file_ = open('familab.log')
marky = Markov(file_)
while True:
    print marky.generate_markov_text(size=100)
    raw_input("Press any key...")