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Merge pull request #32 from LuminosoInsight/thai-fix

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Leave Thai segments alone in the default regex
This commit is contained in:
Andrew Lin 2016-03-10 11:57:44 -05:00
commit 84497429e1
2 changed files with 19 additions and 11 deletions
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7
tests/test.py
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@ -180,3 +180,10 @@ def test_ideographic_fallback():
tokenize(ja_text, 'en'),
['ひらがな', 'カタカナ', 'romaji']
)
# Test that we leave Thai letters stuck together. If we had better Thai support,
# we would actually split this into a three-word phrase.
eq_(tokenize('การเล่นดนตรี', 'th'), ['การเล่นดนตรี'])
eq_(tokenize('"การเล่นดนตรี" means "playing music"', 'en'),
['การเล่นดนตรี', 'means', 'playing', 'music'])

21
wordfreq/tokens.py
View File

@ -3,23 +3,24 @@ import unicodedata
TOKEN_RE = regex.compile(r"""
# Case 1: a special case for Chinese and Japanese
# Case 1: a special case for non-spaced languages
# -----------------------------------------------
# When we see characters that are Han ideographs (\p{IsIdeo}) or hiragana
# (\p{Script=Hiragana}), we allow a sequence of those characters to be
# glued together as a single token. Without this case, the standard rule
# (case 2) would make each character a separate token. This would be the
# correct behavior for word-wrapping, but a messy failure mode for NLP
# tokenization.
# When we see characters that are Han ideographs (\p{IsIdeo}), hiragana
# (\p{Script=Hiragana}), or Thai (\p{Script=Thai}), we allow a sequence
# of those characters to be glued together as a single token.
#
# It is, of course, better to use a tokenizer that is designed for Chinese
# or Japanese text. This is effectively a fallback for when the wrong
# Without this case, the standard rule (case 2) would make each character
# a separate token. This would be the correct behavior for word-wrapping,
# but a messy failure mode for NLP tokenization.
#
# It is, of course, better to use a tokenizer that is designed for Chinese,
# Japanese, or Thai text. This is effectively a fallback for when the wrong
# tokenizer is used.
#
# This rule is listed first so that it takes precedence.
[\p{IsIdeo}\p{Script=Hiragana}]+ |
[\p{IsIdeo}\p{Script=Hiragana}\p{Script=Thai}]+ |
# Case 2: standard Unicode segmentation
# -------------------------------------