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node_modules/inquirer/lib/objects/choices.js

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