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PreProcess.py
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PreProcess.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
####
#### Author: Pedro Paulo Balage Filho
#### Version: 1.0
#### Date: 12/03/13
####
from string import punctuation, letters
import re
# Requires Pattern library (http://www.clips.ua.ac.be/pages/pattern)
from pattern.en import tag
from pattern.vector import stem, PORTER
### Provides a pre-process for tweet messages.
### Replace emoticons, hash, mentions and urls for codes
### Correct long seguences of letters and punctuations
### Apply the Pattern part-of_speech tagger to the message
### Requires the Pattern library to work (http://www.clips.ua.ac.be/pages/pattern)
def pre_process(tweet_message):
# Pattern tag -> a fast tagger
# assures the message can be converted to unicode. Reject the encoding
# errors
tweet_message = tweet_message.decode('utf8',errors='ignore')
# substitute hashes
tweet_message = re.sub(re.escape('#')+r'(\w+)','&hash \g<1>',tweet_message)
# substitute users mentions
tweet_message = re.sub(re.escape('@')+r'(\w+)','&mention \g<1>',tweet_message)
# substitute urls
tweet_message = re.sub(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+','&url',tweet_message)
# look for emoticons.
# Some elements from http://en.wikipedia.org/wiki/List_of_emoticons
emoticons = { ':-)' : '&happy',
':)' : '&happy',
':o)' : '&happy',
':]' : '&happy',
':3' : '&happy',
':c)' : '&happy',
':>' : '&happy',
'=]' : '&happy',
'8)' : '&happy',
'=)' : '&happy',
':}' : '&happy',
':^)' : '&happy',
':-))' : '&happy',
'|;-)' : '&happy',
":'-)" : '&happy',
":')" : '&happy',
'\o/' : '&happy',
'*\\0/*': '&happy',
':-D' : '&laugh',
':D' : '&laugh',
'8-D' : '&laugh',
'8D' : '&laugh',
'x-D' : '&laugh',
'xD' : '&laugh',
'X-D' : '&laugh',
'XD' : '&laugh',
'=-D' : '&laugh',
'=D' : '&laugh',
'=-3' : '&laugh',
'=3' : '&laugh',
'B^D' : '&laugh',
'>:[' : '&sad',
':-(' : '&sad',
':(' : '&sad',
':-c' : '&sad',
':c' : '&sad',
':-<' : '&sad',
':<' : '&sad',
':-[' : '&sad',
':[' : '&sad',
':{' : '&sad',
':-||' : '&sad',
':@' : '&sad',
":'-(" : '&sad',
":'(" : '&sad',
'D:<' : '&sad',
'D:' : '&sad',
'D8' : '&sad',
'D;' : '&sad',
'D=' : '&sad',
'DX' : '&sad',
'v.v' : '&sad',
"D-':" : '&sad',
'(>_<)' : '&sad',
':|' : '&sad',
'>:O' : '&surprise',
':-O' : '&surprise',
':-o' : '&surprise',
':O' : '&surprise',
'°o°' : '&surprise',
':O' : '&surprise',
'o_O' : '&surprise',
'o_0' : '&surprise',
'o.O' : '&surprise',
'8-0' : '&surprise',
'|-O' : '&surprise',
';-)' : '&wink',
';)' : '&wink',
'*-)' : '&wink',
'*)' : '&wink',
';-]' : '&wink',
';]' : '&wink',
';D' : '&wink',
';^)' : '&wink',
':-,' : '&wink',
'>:P' : '&tong',
':-P' : '&tong',
':P' : '&tong',
'X-P' : '&tong',
'x-p' : '&tong',
'xp' : '&tong',
'XP' : '&tong',
':-p' : '&tong',
':p' : '&tong',
'=p' : '&tong',
':-Þ' : '&tong',
':Þ' : '&tong',
':-b' : '&tong',
':b' : '&tong',
':-&' : '&tong',
':&' : '&tong',
'>:\\' : '&annoyed',
'>:/' : '&annoyed',
':-/' : '&annoyed',
':-.' : '&annoyed',
':/' : '&annoyed',
':\\' : '&annoyed',
'=/' : '&annoyed',
'=\\' : '&annoyed',
':L' : '&annoyed',
'=L' : '&annoyed',
':S' : '&annoyed',
'>.<' : '&annoyed',
':-|' : '&annoyed',
'<:-|' : '&annoyed',
':-X' : '&seallips',
':X' : '&seallips',
':-#' : '&seallips',
':#' : '&seallips',
'O:-)' : '&angel',
'0:-3' : '&angel',
'0:3' : '&angel',
'0:-)' : '&angel',
'0:)' : '&angel',
'0;^)' : '&angel',
'>:)' : '&devil',
'>;)' : '&devil',
'>:-)' : '&devil',
'}:-)' : '&devil',
'}:)' : '&devil',
'3:-)' : '&devil',
'3:)' : '&devil',
'o/\o' : '&highfive',
'^5' : '&highfive',
'>_>^' : '&highfive',
'^<_<' : '&highfive',
'<3' : '&heart'
}
# substitute emoticons using regular expression
for symbol in emoticons:
tweet_message = re.sub(r'('+re.escape(symbol)+r')[^a-z0-9A-Z]',' \g<1> '+emoticons[symbol]+' ',tweet_message+' ')
# normalize punctuation signals, like ..., !!!!!!!!, ???????, etc
tweet_message = re.sub(re.escape('...'),'.' + ' &dots',tweet_message)
for symbol in punctuation:
tweet_message = re.sub(re.escape(symbol)+r'{3,}',' ' + symbol + ' &emphasis',tweet_message)
# normalize long sequence of letters coooool -> col, looooove -> love,
# gooooodd -> god
# (always keep one letter)
for symbol in letters:
tweet_message = re.sub(re.escape(symbol)+r'{3,}', symbol ,tweet_message)
# remove many blank spaces.
tweet_message = re.sub(' +',' ' ,tweet_message)
tweet_message = tweet_message.strip()
# Include POS information
tweet_message = tag(tweet_message, tokenize=False)
# Stemmer?
#tweet_message = [(stem(w, stemmer=PORTER),t) for w,t in tweet_message]
# return the twitte in the format [(word,tag),...]
return tweet_message