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comparison: addon-sdk/source/lib/sdk/util/list.js
addon-sdk/source/lib/sdk/util/list.js
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- 6474c204b198
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| -1:000000000000 | 0:21ca492a5c51 |
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| 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'; | |
| 5 | |
| 6 module.metadata = { | |
| 7 "stability": "experimental" | |
| 8 }; | |
| 9 | |
| 10 const { Class } = require('../core/heritage'); | |
| 11 const listNS = require('../core/namespace').ns(); | |
| 12 const { iteratorSymbol } = require('../util/iteration'); | |
| 13 | |
| 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 = []; | |
| 23 | |
| 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; | |
| 56 | |
| 57 function addListItem(that, value) { | |
| 58 let list = listNS(that).keyValueMap, | |
| 59 index = list.indexOf(value); | |
| 60 | |
| 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; | |
| 70 | |
| 71 function removeListItem(that, element) { | |
| 72 let list = listNS(that).keyValueMap, | |
| 73 index = list.indexOf(element); | |
| 74 | |
| 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; | |
| 86 | |
| 87 exports.listNS = listNS; |
