Pig Latin translator command for CloudBot

piglatin.py

import string
import nltk

from cloudbot import hook

pronunciations = None


# Translate functions by J.F. Sebastian
# <https://stackoverflow.com/questions/22773826/pig-latin-translator>

def translate(word):
    global pronunciations
    word = word.lower()  # NOTE: ignore Unicode casefold
    i = 0
    # find out whether the word start with a vowel sound using
    # the pronunciations dictionary
    for syllables in pronunciations.get(word, []):
        for i, syl in enumerate(syllables):
            is_vowel = syl[-1].isdigit()
            if is_vowel:
                break
        else:  # no vowels
            assert 0
        if i == 0:  # starts with a vowel
            return word + "way"
        elif "y" in word:  # allow 'y' as a vowel for known words
            return translate_basic(word, vowels="aeiouy", start=i)
        break  # use only the first pronunciation
    return translate_basic(word, start=i)


def translate_basic(word, vowels="aeiou", start=0):
    word = word.lower()
    i = 0
    for i, c in enumerate(word[start:], start=start):
        if c in vowels:
            break
    else:  # no vowel in the word
        i += 1
    return word[i:] + word[:i] + "w" * (i == 0) + "ay" * word.isalnum()


@hook.on_start()
def load_nltk():
    nltk.download('cmudict')

    global pronunciations
    pronunciations = nltk.corpus.cmudict.dict()


@hook.command("pig", "piglatin")
def piglatin(text):
    """ pig <text> -- Converts <text> to pig latin. """
    global pronunciations
    if not pronunciations:
        return "Please wait, getting NLTK ready!"

    words = []
    for word in text.split():
        if word[-1] in string.punctuation:
            end = word[-1]
            word = word[:-1]
        else:
            end = ""

        out_word = translate(word)

        if word.isupper() and not word == "I":
            out_word = out_word.upper()
        elif word[0].isupper():
            out_word = out_word.title()
        else:
            out_word = out_word.lower()

        words.append(out_word + end)

    if text.isupper():
        return " ".join(words).upper()
    else:
        return " ".join(words)