iskm/wordfreq
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fix tokenization of words like "l'heure"

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This commit is contained in:
Robyn Speer 2016-12-05 18:40:53 -05:00
parent 7f26270644
commit 596368ac6e
2 changed files with 47 additions and 3 deletions
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2
setup.py
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@ -34,7 +34,7 @@ if sys.version_info < (3, 4):
setup( setup(
name="wordfreq", name="wordfreq",
version='1.5.1', version='1.6',
maintainer='Luminoso Technologies, Inc.', maintainer='Luminoso Technologies, Inc.',
maintainer_email='info@luminoso.com', maintainer_email='info@luminoso.com',
url='http://github.com/LuminosoInsight/wordfreq/', url='http://github.com/LuminosoInsight/wordfreq/',

48
wordfreq/tokens.py
View File

@ -22,6 +22,22 @@ ABJAD_LANGUAGES = {
'ar', 'bal', 'fa', 'ku', 'ps', 'sd', 'tk', 'ug', 'ur', 'he', 'yi' 'ar', 'bal', 'fa', 'ku', 'ps', 'sd', 'tk', 'ug', 'ur', 'he', 'yi'
} }
# Languages that can stick particles such as «l'» onto a word starting with
# a vowel sound, and where this vowel sound can follow a silent «h». These
# are French and related languages.
FRENCH_ISH_LANGUAGES = {
'fr', # French
'ca', # Catalan
'frp', # Franco-Provençal or Arpitan
'nrf', # Norman French / Jèrriais / Guernésiais
'oc', # Occitan
'pcd', # Picard
'wa', # Walloon
'frm', # Middle French
'fro', # Old French
}
def _make_spaceless_expr(): def _make_spaceless_expr():
pieces = [r'\p{IsIdeo}'] + [r'\p{Script=%s}' % script_code for script_code in SPACELESS_SCRIPTS] pieces = [r'\p{IsIdeo}'] + [r'\p{Script=%s}' % script_code for script_code in SPACELESS_SCRIPTS]
@ -113,8 +129,10 @@ def simple_tokenize(text, include_punctuation=False):
would end up in its own token, which is worse. would end up in its own token, which is worse.
""" """
text = unicodedata.normalize('NFC', text) text = unicodedata.normalize('NFC', text)
token_expr = TOKEN_RE_WITH_PUNCTUATION if include_punctuation else TOKEN_RE if include_punctuation:
return [token.strip("'").casefold() for token in token_expr.findall(text)] return [token.casefold() for token in TOKEN_RE_WITH_PUNCTUATION.findall(text)]
else:
return [token.strip("'").casefold() for token in TOKEN_RE.findall(text)]
def turkish_tokenize(text, include_punctuation=False): def turkish_tokenize(text, include_punctuation=False):
@ -142,6 +160,30 @@ def romanian_tokenize(text, include_punctuation=False):
] ]
def french_tokenize(text, include_punctuation=False):
"""
Handle French apostrophes that precede an 'h', which should work the same as
before a vowel, which the Unicode Consortium forgot. "l'heure" should tokenize
as "l'" and "heure".
This also applies the same way to other languages such as Catalan.
"""
tokens = []
for token in simple_tokenize(text, include_punctuation):
if "'h" in token:
idx = token.find("'h")
if include_punctuation:
# Only include the apostrophe in the token if
# include_punctuation is True
tokens.append(token[:idx + 1])
else:
tokens.append(token[:idx])
tokens.append(token[idx + 1:])
else:
tokens.append(token)
return tokens
def tokenize_mecab_language(text, lang, include_punctuation=False): def tokenize_mecab_language(text, lang, include_punctuation=False):
""" """
Tokenize Japanese or Korean text, initializing the MeCab tokenizer if necessary. Tokenize Japanese or Korean text, initializing the MeCab tokenizer if necessary.
@ -318,6 +360,8 @@ def tokenize(text, lang, include_punctuation=False, external_wordlist=False):
return turkish_tokenize(text, include_punctuation) return turkish_tokenize(text, include_punctuation)
elif lang == 'ro': elif lang == 'ro':
return romanian_tokenize(text, include_punctuation) return romanian_tokenize(text, include_punctuation)
elif lang in FRENCH_ISH_LANGUAGES:
return french_tokenize(text, include_punctuation)
elif lang in ABJAD_LANGUAGES: elif lang in ABJAD_LANGUAGES:
text = remove_marks(unicodedata.normalize('NFKC', text)) text = remove_marks(unicodedata.normalize('NFKC', text))
return simple_tokenize(text, include_punctuation) return simple_tokenize(text, include_punctuation)