"""
Very simple tokenizer
using regular expressions
"""
import re
from unicodedata import normalize
_PATTERNS = {
"default":
(
r'(?P<FOLDERUNIX>/(?:bin|boot|dev|etc|home|lib|mnt|opt|root|sbin|tmp|usr|var|Bureau|Documents|Images|Musique|Public|Téléchargements|Vidéos)(?:/[\w.()-]+)*)',
r'(?P<FOLDERWIN>[a-zA-Z]:\\(?:Program Files(?: [(]x86[)]|)|[\w.()]+)(?:\\[\w.()-]+)*)',
r'(?P<PUNC>[][,.;:!?…«»“”‘’"(){}·–—¿¡])',
r'(?P<WORD_ACRONYM>[A-Z][.][A-Z][.](?:[A-Z][.])*)',
r'(?P<LINK>(?:https?://|www[.]|\w+[@.]\w\w+[@.])\w[\w./?&!%=+*"\'@$#-]+)',
r'(?P<HASHTAG>[#@][\w-]+)',
r'(?P<HTML><\w+.*?>|</\w+ *>)',
r'(?P<PSEUDOHTML>\[/?\w+\])',
r'(?P<HOUR>\d\d?[h:]\d\d(?:[m:]\d\ds?|)\b)',
r'(?P<NUM>\d+(?:[.,]\d+))',
r'(?P<SIGN>[&%‰€$+±=*/<>⩾⩽#|×¥£§¢¬÷@-])',
r"(?P<WORD>(?:(?!_)[\w\u0300-\u036f])+(?:[’'`-](?:(?!_)[\w\u0300-\u036f])+)*)", # with combining diacritics
r"(?P<UNDERSCORE>_+)",
r"(?P<OTHER>\S)"
),
"fr":
(
r'(?P<FOLDERUNIX>/(?:bin|boot|dev|etc|home|lib|mnt|opt|root|sbin|tmp|usr|var|Bureau|Documents|Images|Musique|Public|Téléchargements|Vidéos)(?:/[\w.()-]+)*)',
r'(?P<FOLDERWIN>[a-zA-Z]:\\(?:Program Files(?: [(]x86[)]|)|[\w.()]+)(?:\\[\w.()-]+)*)',
r'(?P<PUNC>[][,.;:!?…«»“”‘’"(){}·–—¿¡])',
r'(?P<WORD_ACRONYM>[A-Z][.][A-Z][.](?:[A-Z][.])*)',
r'(?P<LINK>(?:https?://|www[.]|\w+[@.]\w\w+[@.])\w[\w./?&!%=+*"\'@$#-]+)',
r'(?P<HASHTAG>[#@][\w-]+)',
r'(?P<HTML><\w+.*?>|</\w+ *>)',
r'(?P<PSEUDOHTML>\[/?\w+\])',
r"(?P<WORD_ELIDED>(?:l|d|n|m|t|s|j|c|ç|lorsqu|puisqu|jusqu|quoiqu|qu|presqu|quelqu)['’ʼ‘‛´`′‵՚ꞌꞋ])",
r'(?P<WORD_ORDINAL>\d+(?:ers?|res?|è[rm]es?|i[èe][mr]es?|de?s?|nde?s?|ès?|es?|ᵉʳˢ?|ʳᵉˢ?|ᵈᵉ?ˢ?|ⁿᵈᵉ?ˢ?|ᵉˢ?)\b)',
r'(?P<HOUR>\d\d?[h:]\d\d(?:[m:]\d\ds?|)\b)',
r'(?P<NUM>\d+(?:[.,]\d+|))',
r'(?P<SIGN>[&%‰€$+±=*/<>⩾⩽#|×¥£¢§¬÷@-])',
r"(?P<WORD>(?:(?!_)[\w\u0300-\u036f])+(?:[’'`-](?:(?!_)[\w\u0300-\u036f])+)*)", # with combining diacritics
r"(?P<UNDERSCORE>_+)",
r"(?P<OTHER>\S)"
)
}
class Tokenizer:
"Tokenizer: transforms a text in a list of tokens"
def __init__ (self, sLang):
self.sLang = sLang
if sLang not in _PATTERNS:
self.sLang = "default"
self.zToken = re.compile( "(?i)" + '|'.join(sRegex for sRegex in _PATTERNS[sLang]) )
def genTokens (self, sText, bStartEndToken=False):
"generator: tokenize <sText>"
i = 0
if bStartEndToken:
yield { "i": 0, "sType": "INFO", "sValue": "<start>", "nStart": 0, "nEnd": 0, "lMorph": ["<start>"] }
for i, m in enumerate(self.zToken.finditer(sText), 1):
yield { "i": i, "sType": m.lastgroup, "sValue": normalize("NFC", m.group()), "nStart": m.start(), "nEnd": m.end() }
if bStartEndToken:
iEnd = len(sText)
yield { "i": i+1, "sType": "INFO", "sValue": "<end>", "nStart": iEnd, "nEnd": iEnd, "lMorph": ["<end>"] }
def getTokenTypes (self):
"returns list of token types as tuple (token name, regex)"
return [ sRegex[4:-1].split(">") for sRegex in _PATTERNS[self.sLang] ]