151 lines
4.8 KiB
Python
151 lines
4.8 KiB
Python
import logging
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import random
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from django.db.models import Sum
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from markov.models import MarkovContext, MarkovState, MarkovTarget
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log = logging.getLogger('markov.lib')
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def generate_line(context, topics=None, min_words=15, max_words=30, max_sentences=3):
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"""String multiple sentences together into a coherent sentence."""
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tries = 0
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sentences = 0
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line = []
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while tries < 5:
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line += generate_longish_sentence(context, topics=topics, max_words=max_words)
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sentences += 1
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if sentences >= max_sentences:
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return line
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if len(line) >= min_words:
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return line
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else:
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if line[-1][-1] not in [',', '.', '!']:
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line[-1] += random.choice([',', '.', '!'])
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tries += 1
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# if we got here, we need to give up
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return line
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def generate_longish_sentence(context, topics=None, min_words=4, max_words=30):
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"""Generate a Markov chain, but throw away the short ones unless we get desperate."""
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tries = 0
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while tries < 5:
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sent = generate_sentence(context, topics=topics, max_words=max_words)
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if len(sent) >= min_words:
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return sent
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tries += 1
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# if we got here, we need to just give up
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return generate_sentence(context)
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def generate_sentence(context, topics=None, max_words=30):
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"""Generate a Markov chain."""
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words = []
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# if we have topics, try to work from it and work backwards
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if topics:
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topic_word = random.choice(topics)
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topics.remove(topic_word)
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log.debug(u"looking for topic '{0:s}'".format(topic_word))
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new_states = MarkovState.objects.filter(context=context, v=topic_word)
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if len(new_states) > 0:
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log.debug(u"found '{0:s}', starting backwards".format(topic_word))
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words.insert(0, topic_word)
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while len(words) <= max_words and words[0] != MarkovState._start2:
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log.debug(u"looking backwards for '{0:s}'".format(words[0]))
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new_states = MarkovState.objects.filter(context=context, v=words[0])
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words.insert(0, get_word_out_of_states(new_states, backwards=True))
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# if we didn't get topic stuff, we need to start (forwards) here
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if len(words) == 0:
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words = [MarkovState._start1, MarkovState._start2]
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i = len(words)
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while len(words) <= max_words and words[-1] != MarkovState._stop:
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log.debug(u"looking for '{0:s}','{1:s}'".format(words[i-2], words[i-1]))
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new_states = MarkovState.objects.filter(context=context, k1=words[i-2], k2=words[i-1])
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log.debug(u"states retrieved")
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words.append(get_word_out_of_states(new_states))
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i += 1
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words = [word for word in words if word not in
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(MarkovState._start1, MarkovState._start2, MarkovState._stop)]
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return words
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def get_or_create_target_context(target_name):
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"""Return the context for a provided nick/channel, creating missing ones."""
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# find the stuff, or create it
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target, c = MarkovTarget.objects.get_or_create(name=target_name)
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try:
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return target.context
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except MarkovContext.DoesNotExist:
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# make a context --- lacking a good idea, just create one with this target name until configured otherwise
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context, c = MarkovContext.objects.get_or_create(name=target_name)
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target.context = context
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target.save()
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return target.context
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def get_word_out_of_states(states, backwards=False):
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"""Pick one random word out of the given states."""
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new_word = ''
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running = 0
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count_sum = states.aggregate(Sum('count'))['count__sum']
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hit = random.randint(0, count_sum)
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log.debug(u"sum: {0:d} hit: {1:d}".format(count_sum, hit))
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states_itr = states.iterator()
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for state in states_itr:
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running += state.count
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if running >= hit:
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if backwards:
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new_word = state.k2
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else:
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new_word = state.v
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break
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log.debug(u"found '{0:s}'".format(new_word))
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return new_word
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def learn_line(line, context):
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"""Create a bunch of MarkovStates for a given line of text."""
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log.debug(u"learning %s...", line[:40])
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words = line.split()
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words = [MarkovState._start1, MarkovState._start2] + words + [MarkovState._stop]
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for word in words:
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if len(word) > MarkovState._meta.get_field('k1').max_length:
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return
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for i, word in enumerate(words):
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log.debug(u"'{0:s}','{1:s}' -> '{2:s}'".format(words[i], words[i+1], words[i+2]))
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state, created = MarkovState.objects.get_or_create(context=context,
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k1=words[i],
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k2=words[i+1],
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v=words[i+2])
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state.count += 1
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state.save()
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if i > len(words) - 4:
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break
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