node-nlp
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Library for NLU (Natural Language Understanding) done in Node.js
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<a href="..\..\..\index.html">All files</a> / <a href="index.html">lib/nlp/tokenizers</a> treebank-word-tokenizer.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/*
* Copyright (c) AXA Shared Services Spain S.A.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
const Tokenizer = require('./tokenizer');
class TreebankWordTokenizer extends Tokenizer {
constructor(settings) {
super(settings);
this.contractions2 = [
/(.)('ll|'re|'ve|n't|'s|'m|'d)\b/gi,
/\b(can)(not)\b/gi,
/\b(D)('ye)\b/gi,
/\b(Gim)(me)\b/gi,
/\b(Gon)(na)\b/gi,
/\b(Got)(ta)\b/gi,
/\b(Lem)(me)\b/gi,
/\b(Mor)('n)\b/gi,
/\b(T)(is)\b/gi,
/\b(T)(was)\b/gi,
/\b(Wan)(na)\b/gi,
];
this.contraction3 = [/\b(Whad)(dd)(ya)\b/gi, /\b(Wha)(t)(cha)\b/gi];
}
applyRegexList(text, regexList, replaceValue) {
let result = text;
regexList.forEach(regex => {
result = result.replace(regex, replaceValue);
});
return result;
}
tokenize(srcText) {
let text = this.applyRegexList(srcText, this.contractions2, '$1 $2');
text = this.applyRegexList(text, this.contraction3, '$1 $2 $3');
text = text.replace(/([^\w.'\-/+<>,&])/g, ' $1 ');
text = text.replace(/(,\s)/g, ' $1');
text = text.replace(/('\s)/g, ' $1');
text = text.replace(/\. *(\n|$)/g, ' . ');
const tokens = text.split(/\s+/);
return tokens.filter(s => s);
}
}
module.exports = TreebankWordTokenizer;
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