addon-sdk/source/lib/sdk/util/list.js@6474c204b198
addon-sdk/source/lib/sdk/util/list.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4 'use strict';
6 module.metadata = {
7 "stability": "experimental"
8 };
10 const { Class } = require('../core/heritage');
11 const listNS = require('../core/namespace').ns();
12 const { iteratorSymbol } = require('../util/iteration');
14 const listOptions = {
15 /**
16 * List constructor can take any number of element to populate itself.
17 * @params {Object|String|Number} element
18 * @example
19 * List(1,2,3).length == 3 // true
20 */
21 initialize: function List() {
22 listNS(this).keyValueMap = [];
24 for (let i = 0, ii = arguments.length; i < ii; i++)
25 addListItem(this, arguments[i]);
26 },
27 /**
28 * Number of elements in this list.
29 * @type {Number}
30 */
31 get length() listNS(this).keyValueMap.length,
32 /**
33 * Returns a string representing this list.
34 * @returns {String}
35 */
36 toString: function toString() 'List(' + listNS(this).keyValueMap + ')',
37 /**
38 * Custom iterator providing `List`s enumeration behavior.
39 * We cant reuse `_iterator` that is defined by `Iterable` since it provides
40 * iteration in an arbitrary order.
41 * @see https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in
42 * @param {Boolean} onKeys
43 */
44 __iterator__: function __iterator__(onKeys, onKeyValue) {
45 let array = listNS(this).keyValueMap.slice(0),
46 i = -1;
47 for each(let element in array)
48 yield onKeyValue ? [++i, element] : onKeys ? ++i : element;
49 },
50 };
51 listOptions[iteratorSymbol] = function iterator() {
52 return listNS(this).keyValueMap.slice(0)[iteratorSymbol]();
53 };
54 const List = Class(listOptions);
55 exports.List = List;
57 function addListItem(that, value) {
58 let list = listNS(that).keyValueMap,
59 index = list.indexOf(value);
61 if (-1 === index) {
62 try {
63 that[that.length] = value;
64 }
65 catch (e) {}
66 list.push(value);
67 }
68 }
69 exports.addListItem = addListItem;
71 function removeListItem(that, element) {
72 let list = listNS(that).keyValueMap,
73 index = list.indexOf(element);
75 if (0 <= index) {
76 list.splice(index, 1);
77 try {
78 for (let length = list.length; index < length; index++)
79 that[index] = list[index];
80 that[list.length] = undefined;
81 }
82 catch(e){}
83 }
84 }
85 exports.removeListItem = removeListItem;
87 exports.listNS = listNS;
