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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Jetpack.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Irakli Gozalishvili <gozala@mozilla.com> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
"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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