node-nlp

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JSDoc: Source: sentiment/sentiment-analyzer.js</title> <script src="scripts/prettify/prettify.js"> </script> <script src="scripts/prettify/lang-css.js"> </script>  <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css"> <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css"> </head> <body> <div id="main"> <h1 class="page-title">Source: sentiment/sentiment-analyzer.js</h1> <section> <article> <pre class="prettyprint source linenums"><code>/* * 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 NlpUtil = require('../nlp/nlp-util'); /** * Class for a Sentiment Analyzer. * Sentiment analysis can use 3 different type of files: * - AFINN * - Senticon * - Pattern */ class SentimentAnalyzer { /** * Constructor of the class. * @param {Object} settings Settings to initialize the instance. */ constructor(settings) { this.settings = settings || {}; if (!this.settings.language) { this.settings.language = 'en'; } if (!this.settings.tokenizer) { this.settings.tokenizer = NlpUtil.getTokenizer(this.settings.language); } if (!this.settings.type) { switch (this.settings.language) { case 'en': this.settings.type = 'senticon'; break; case 'es': this.settings.type = 'senticon'; break; case 'it': this.settings.type = 'pattern'; break; case 'fr': this.settings.type = 'pattern'; break; case 'nl': this.settings.type = 'pattern'; break; case 'de': this.settings.type = 'senticon'; break; default: this.settings.type = 'senticon'; } } if (!SentimentAnalyzer.loadedFiles) { SentimentAnalyzer.loadedFiles = {}; } this.loadVocabulary(); } /** * Load the vocabulary and negation files based on the type of files and language. */ loadVocabulary() { this.vocabularyFileName = `./languages/${this.settings.language}/${ this.settings.type }_${this.settings.language}.json`; this.negationFileName = `./languages/${this.settings.language}/negations_${ this.settings.language }.json`; try { // eslint-disable-next-line this.vocabulary = require(this.vocabularyFileName); } catch (ex) { this.vocabulary = undefined; } if ( this.vocabulary && !SentimentAnalyzer.loadedFiles[this.vocabularyFileName] ) { SentimentAnalyzer.loadedFiles[this.vocabularyFileName] = true; if ( this.settings.type === 'senticon' || this.settings.type === 'pattern' ) { const propertyName = this.settings.type === 'senticon' ? 'pol' : 'polarity'; Object.keys(this.vocabulary).forEach(word => { this.vocabulary[word] = Number.parseFloat( this.vocabulary[word][propertyName] ); }); } } try { // eslint-disable-next-line this.negations = require(this.negationFileName).words || []; } catch (ex) { this.negations = []; } } /** * Given an utterance, return the sentiment analysis of the utterance. * @param {String} utterance Utterance to be analyzed. */ getSentiment(utterance) { const words = Array.isArray(utterance) ? utterance : this.settings.tokenizer.tokenize(utterance); if (!this.vocabulary) { return { score: 0, numWords: words.length, numHits: 0, comparative: 0, type: this.settings.type, language: this.settings.language, }; } let score = 0; let negator = 1; let nrHits = 0; words.forEach(token => { const lowerCased = token.toLowerCase(); if (this.negations.indexOf(lowerCased) !== -1) { negator = -1; nrHits += 1; } else if (this.vocabulary[lowerCased] !== undefined) { score += negator * this.vocabulary[lowerCased]; nrHits += 1; } }); return { score, numWords: words.length, numHits: nrHits, comparative: score / words.length, type: this.settings.type, language: this.settings.language, }; } } module.exports = SentimentAnalyzer; </code></pre> </article> </section> </div> <nav> <h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="BinaryNeuralNetworkClassifier.html">BinaryNeuralNetworkClassifier</a></li><li><a href="Classifier.html">Classifier</a></li><li><a href="ConversationContext.html">ConversationContext</a></li><li><a href="DutchStemmer.html">DutchStemmer</a></li><li><a href="EnglishStemmer.html">EnglishStemmer</a></li><li><a href="EnumNamedEntity.html">EnumNamedEntity</a></li><li><a href="Evaluator.html">Evaluator</a></li><li><a href="HungarianStemmer.html">HungarianStemmer</a></li><li><a href="ItalianStemmer.html">ItalianStemmer</a></li><li><a href="Language.html">Language</a></li><li><a href="LogisticRegressionClassifier.html">LogisticRegressionClassifier</a></li><li><a href="Matrix.html">Matrix</a></li><li><a href="MemoryConversationContext.html">MemoryConversationContext</a></li><li><a href="NamedEntity.html">NamedEntity</a></li><li><a href="NerManager.html">NerManager</a></li><li><a href="NlgManager.html">NlgManager</a></li><li><a href="NlpClassifier.html">NlpClassifier</a></li><li><a href="NlpManager.html">NlpManager</a></li><li><a href="NorwegianStemmer.html">NorwegianStemmer</a></li><li><a href="PortugueseStemmer.html">PortugueseStemmer</a></li><li><a href="Recognizer.html">Recognizer</a></li><li><a href="RegexNamedEntity.html">RegexNamedEntity</a></li><li><a href="RomanianStemmer.html">RomanianStemmer</a></li><li><a href="RussianStemmer.html">RussianStemmer</a></li><li><a href="SentimentAnalyzer.html">SentimentAnalyzer</a></li><li><a href="SentimentManager.html">SentimentManager</a></li><li><a href="SimilarSearch.html">SimilarSearch</a></li><li><a href="SlotManager.html">SlotManager</a></li><li><a href="StemmerJa.html">StemmerJa</a></li><li><a href="SwedishStemmer.html">SwedishStemmer</a></li><li><a href="Tokenizer.html">Tokenizer</a></li><li><a href="TrimNamedEntity.html">TrimNamedEntity</a></li><li><a href="TurkishStemmer.html">TurkishStemmer</a></li><li><a href="Vector.html">Vector</a></li><li><a href="XTable.html">XTable</a></li></ul><h3>Global</h3><ul><li><a href="global.html#endsinArr">endsinArr</a></li><li><a href="global.html#prelude">prelude</a></li><li><a href="global.html#regions">regions</a></li><li><a href="global.html#stem">stem</a></li><li><a href="global.html#stopwords">stopwords</a></li></ul> </nav> <br class="clear"> <footer> Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Sat Oct 13 2018 19:14:51 GMT+0200 (CEST) </footer> <script> prettyPrint(); </script> <script src="scripts/linenumber.js"> </script> </body> </html>