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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Trait } = require('./traits');
/**
* @see https://jetpack.mozillalabs.com/sdk/latest/docs/#module/api-utils/list
*/
const Iterable = Trait.compose({
/**
* Hash map of key-values to iterate over.
* Note: That this property can be a getter if you need dynamic behavior.
* @type {Object}
*/
_keyValueMap: Trait.required,
/**
* Custom iterator providing `Iterable`s enumeration behavior.
* @param {Boolean} onKeys
*/
__iterator__: function __iterator__(onKeys, onKeyValue) {
let map = this._keyValueMap;
for (let key in map)
yield onKeyValue ? [key, map[key]] : onKeys ? key : map[key];
}
});
exports.Iterable = Iterable;
/**
* An ordered collection (also known as a sequence) disallowing duplicate
* elements. List is composed out of `Iterable` there for it provides custom
* enumeration behavior that is similar to array (enumerates only on the
* elements of the list). List is a base trait and is meant to be a part of
* composition, since all of it's API is private except length property.
*/
const List = Trait.resolve({ toString: null }).compose({
_keyValueMap: null,
/**
* List constructor can take any number of element to populate itself.
* @params {Object|String|Number} element
* @example
* List(1,2,3).length == 3 // true
*/
constructor: function List() {
this._keyValueMap = [];
for (let i = 0, ii = arguments.length; i < ii; i++)
this._add(arguments[i]);
},
/**
* Number of elements in this list.
* @type {Number}
*/
get length() this._keyValueMap.length,
/**
* Returns a string representing this list.
* @returns {String}
*/
toString: function toString() 'List(' + this._keyValueMap + ')',
/**
* Returns `true` if this list contains the specified `element`.
* @param {Object|Number|String} element
* @returns {Boolean}
*/
_has: function _has(element) 0 <= this._keyValueMap.indexOf(element),
/**
* Appends the specified `element` to the end of this list, if it doesn't
* contains it. Ignores the call if `element` is already contained.
* @param {Object|Number|String} element
*/
_add: function _add(element) {
let list = this._keyValueMap,
index = list.indexOf(element);
if (0 > index)
list.push(this._public[list.length] = element);
},
/**
* Removes specified `element` from this list, if it contains it.
* Ignores the call if `element` is not contained.
* @param {Object|Number|String} element
*/
_remove: function _remove(element) {
let list = this._keyValueMap,
index = list.indexOf(element);
if (0 <= index) {
delete this._public[list.length - 1];
list.splice(index, 1);
for (let length = list.length; index < length; index++)
this._public[index] = list[index];
}
},
/**
* Removes all of the elements from this list.
*/
_clear: function _clear() {
for (let i = 0, ii = this._keyValueMap.length; i < ii; i ++)
delete this._public[i];
this._keyValueMap.splice(0);
},
/**
* Custom iterator providing `List`s enumeration behavior.
* We cant reuse `_iterator` that is defined by `Iterable` since it provides
* iteration in an arbitrary order.
* @see https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in
* @param {Boolean} onKeys
*/
__iterator__: function __iterator__(onKeys, onKeyValue) {
let array = this._keyValueMap.slice(0),
i = -1;
for each(let element in array)
yield onKeyValue ? [++i, element] : onKeys ? ++i : element;
}
});
exports.List = List;
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