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add appending words to wordslist support #17

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15 changes: 14 additions & 1 deletion wordninja.py
Original file line number Diff line number Diff line change
Expand Up @@ -27,12 +27,22 @@

class LanguageModel(object):
def __init__(self, word_file):
self.word_file = word_file
# Build a cost dictionary, assuming Zipf's law and cost = -math.log(probability).
with gzip.open(word_file) as f:
words = f.read().decode().split()
self._wordcost = dict((k, log((i+1)*log(len(words)))) for i,k in enumerate(words))
self._maxword = max(len(x) for x in words)



def add_word(self, w):
with gzip.open(self.word_file, 'a') as f:
f.write(b'%b' % (w.encode('utf-8')))

num_words = len(self._wordcost) + 1
self._wordcost[w] = log((num_words)*log(num_words))
self._maxword = max(self._maxword, len(w))


def split(self, s):
"""Uses dynamic programming to infer the location of spaces in a string without spaces."""
Expand Down Expand Up @@ -83,4 +93,7 @@ def best_match(i):
def split(s):
return DEFAULT_LANGUAGE_MODEL.split(s)

def add_word(w):
return DEFAULT_LANGUAGE_MODEL.add_word(w)