node-nlp
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Library for NLU (Natural Language Understanding) done in Node.js
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<h1 class="page-title">Source: nlg/nlg-manager.js</h1>
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<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 Evaluator = require('../util/evaluator');
/**
* Natural Language Generator Manger
*/
class NlgManager {
/**
* Constructor of the class
*/
constructor() {
this.evaluator = new Evaluator();
this.responses = {};
}
/**
* Evaluate the condition using the context, and return true
* if the condition is passed, false otherwise.
* @param {String} condition Condition to be evaluated.
* @param {Object} context Context to use to validate the condition.
* @returns {boolean} True if the condition is passed, false otherwise.
*/
isValid(condition, context) {
return (
!condition ||
condition === '' ||
this.evaluator.evaluate(condition, context) === true
);
}
/**
* Find all valid answers for the given locale and intent.
* @param {String} locale Locale of the intent.
* @param {String} intent Intent name.
* @param {Object} context Context to evaluate conditions.
*/
findAllAnswers(locale, intent, context) {
if (!this.responses[locale]) {
return [];
}
const answers = this.responses[locale][intent];
if (!answers || answers.length === 0) {
return [];
}
const result = [];
answers.forEach(answer => {
if (this.isValid(answer.condition, context)) {
result.push(answer);
}
});
return result;
}
/**
* Find one valid answers for the given locale and intent. If there are
* more than one valid answer, then return one of them at random.
* @param {String} locale Locale of the intent.
* @param {String} intent Intent name.
* @param {Object} context Context to evaluate conditions.
*/
findAnswer(locale, intent, context) {
const result = this.findAllAnswers(locale, intent, context);
if (result.length === 0) {
return undefined;
}
if (result.length === 1) {
return result[0];
}
return result[Math.floor(Math.random() * result.length)];
}
indexOfAnswer(locale, intent, answer, condition) {
if (!this.responses[locale]) {
return -1;
}
if (!this.responses[locale][intent]) {
return -1;
}
for (let i = 0; i < this.responses[locale][intent].length; i += 1) {
const response = this.responses[locale][intent][i];
if (response.response === answer && response.condition === condition) {
return i;
}
}
return -1;
}
/**
* Adds an answer for a locale and intent.
* @param {String} locale Locale of the intent.
* @param {String} intent Intent name.
* @param {String} answer Text of the answer.
* @param {String} condition Condition to be evaluated.
*/
addAnswer(locale, intent, answer, condition) {
if (this.indexOfAnswer(locale, intent, answer, condition) !== -1) {
return;
}
if (!this.responses[locale]) {
this.responses[locale] = {};
}
if (!this.responses[locale][intent]) {
this.responses[locale][intent] = [];
}
this.responses[locale][intent].push({
condition,
response: answer,
});
}
/**
* Remove and answer from a locale and intent.
* @param {String} locale Locale of the intent.
* @param {String} intent Intent name.
* @param {String} answer Text of the answer.
* @param {String} condition Condition to be evaluated.
*/
removeAnswer(locale, intent, answer, condition) {
const index = this.indexOfAnswer(locale, intent, answer, condition);
if (index !== -1) {
this.responses[locale][intent].splice(index, 1);
}
}
}
module.exports = NlgManager;
</code></pre>
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