lucytok 0.1.3

Lucytok

Lucene's boring English tokenizers recreated for Python. Compatible with SearchArray.

Lets you configure a handful of normal tokenization rules like ascii folding, posessive removal, both types of porter stemming, English stopwords, etc.

Usage

Creating a tokenizer close to Elasticsearch's default english analyzer

from lucytok import english
es_english = english("Nsp|NNN|lsN1")
tokenized = es_english("The quick brown fox jumps over the lazy døg")
print(tokenized)

Outputs

['_', 'quick', 'brown', 'fox', 'jump', 'over', '_', 'lazi', 'døg']

Make a tokenizer with ASCII folding...

from lucytok import english
es_english_folded = english("asp|NNN|lsN1")
print(es_english_folded("The quick brown fox jumps over the lazy døg"))

['_', 'quick', 'brown', 'fox', 'jump', 'over', '_', 'lazi', 'dog']

Spec

Create a tokenizer using the following settings (these concepts correspond to their Elasticsearch counterparts):

#  |- ASCII fold (a) or not (N)
#  ||- Standard (s) or WS tokenizer (w)
#  ||- Remove possessive suffixes (p) or not (N)
#  |||
# "NsN|NNN|NNNN"
#      ||| ||||
#      ||| ||||- Porter stem version (1) or version (2) vs N/0 for none
#      ||| |||- Manually convert irregular plurals (p) or not (N)
#      ||| ||- Blank out stopwords (s) or not (N)
#      ||| |- Lowercase (l) or not (N)
#      |||- Split on letter/number transitions (n) or not (N)
#      ||- Split on case changes (c) or not (N)
#      |- Split on punctuation (p) or not (N)