tokepi

tokepi

Node.js tokenizer that transforms a string of sentences into an array of white-space separated strings of tokens. Partial port from the pattern.en library of CLIPS (University of Antwerp), so all credits go to the original author Tom De Smedt.

Includes following features and lack thereof is main reason for not using existing node tokenizers:

• Abbreviation recognition
• Emoticon recognition
• Contraction separation
• No listeners: give a string, get your array of sentences-tokens

Usage

Download the library with the npm package manager

npm install tokepi

Import and start using

  var tokepi = require("tokepi");

  var tokens = tokepi("This is a rather boring sentence, i.e. not so interesting. Now this is already more awesome:)!?");
  // tokens = [ "This is a rather boring sentence, i.e. not so interesting .",
  //            "Now this is already more awesome :) ! ?"];

  tokens.map(function (s) { return s.split(" "); });
  // = [["This", "is", "a", "rather", "boring", "sentence", ",", "i.e.", "not", "so", "interesting", "."],
  //    ["Now", "this", "is", "already", "more", "awesome", ":)", "!", "?"]];

Supported

• Emoticons: the supported emoticons can be found in the Emotional-emoticons package.

• Abbreviations

[ "a.", "adj.", "adv.", "al.", "a.m.", "art.", "c.", "capt.", "cert.", "cf.", "col.", "Col.", 
  "comp.", "conf.", "def.", "Dep.", "Dept.", "Dr.", "dr.", "ed.", "e.g.", "esp.", "etc.", "ex.", 
  "f.", "fig.", "gen.", "id.", "i.e.", "int.", "l.", "m.", "Med.", "Mil.", "Mr.", "n.", "n.q.", 
  "orig.", "pl.", "pred.", "pres.", "p.m.", "ref.", "v.", "vs.", "w/" ]

and patterns matched by following regular expressions

/^[A-Za-z]\.$/g      // single letter, "T. De Smedt"
/^([A-Za-z]\.)+$/g   // alternating letters, "U.S."
/^[A-Z][b|c|d|f|g|h|j|k|l|m|n|p|q|r|s|t|v|w|x|z]+.$/g // capital followed by consonants, "Mr."

• Contractions

["'d", "'m", 's","'ll", "'re", "'ve", "n't"]

Feel free to request additions.

Test

In order to run the test, make sure all dependencies are installed with npm install

and then simply run with

npm test

License (BSD)

Copyright (c) 2011-2013 University of Antwerp, Belgium All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of Pattern nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.