'use strict';
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var assert = require('assert');
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var _ = {
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isNumber: require('lodash/isNumber'),
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filter: require('lodash/filter'),
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map: require('lodash/map'),
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find: require('lodash/find'),
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};
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var Separator = require('./separator');
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var Choice = require('./choice');
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/**
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* Choices collection
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* Collection of multiple `choice` object
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* @constructor
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* @param {Array} choices All `choice` to keep in the collection
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*/
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module.exports = class Choices {
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constructor(choices, answers) {
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this.choices = choices.map((val) => {
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if (val.type === 'separator') {
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if (!(val instanceof Separator)) {
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val = new Separator(val.line);
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}
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return val;
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}
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return new Choice(val, answers);
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});
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this.realChoices = this.choices
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.filter(Separator.exclude)
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.filter((item) => !item.disabled);
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Object.defineProperty(this, 'length', {
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get() {
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return this.choices.length;
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},
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set(val) {
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this.choices.length = val;
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},
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});
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Object.defineProperty(this, 'realLength', {
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get() {
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return this.realChoices.length;
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},
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set() {
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throw new Error('Cannot set `realLength` of a Choices collection');
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},
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});
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}
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/**
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* Get a valid choice from the collection
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* @param {Number} selector The selected choice index
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* @return {Choice|Undefined} Return the matched choice or undefined
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*/
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getChoice(selector) {
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assert(_.isNumber(selector));
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return this.realChoices[selector];
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}
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/**
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* Get a raw element from the collection
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* @param {Number} selector The selected index value
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* @return {Choice|Undefined} Return the matched choice or undefined
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*/
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get(selector) {
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assert(_.isNumber(selector));
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return this.choices[selector];
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}
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/**
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* Match the valid choices against a where clause
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* @param {Object} whereClause Lodash `where` clause
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* @return {Array} Matching choices or empty array
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*/
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where(whereClause) {
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return _.filter(this.realChoices, whereClause);
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}
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/**
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* Pluck a particular key from the choices
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* @param {String} propertyName Property name to select
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* @return {Array} Selected properties
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*/
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pluck(propertyName) {
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return _.map(this.realChoices, propertyName);
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}
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// Expose usual Array methods
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indexOf() {
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return this.choices.indexOf.apply(this.choices, arguments);
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}
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forEach() {
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return this.choices.forEach.apply(this.choices, arguments);
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}
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filter() {
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return this.choices.filter.apply(this.choices, arguments);
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}
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reduce() {
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return this.choices.reduce.apply(this.choices, arguments);
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}
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find(func) {
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return _.find(this.choices, func);
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}
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push() {
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var objs = _.map(arguments, (val) => new Choice(val));
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this.choices.push.apply(this.choices, objs);
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this.realChoices = this.choices
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.filter(Separator.exclude)
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.filter((item) => !item.disabled);
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return this.choices;
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}
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};
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