1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/* 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 { Class } = require('../core/heritage');
const listNS = require('../core/namespace').ns();
const List = Class({
/**
* List constructor can take any number of element to populate itself.
* @params {Object|String|Number} element
* @example
* List(1,2,3).length == 3 // true
*/
initialize: function List() {
listNS(this).keyValueMap = [];
for (let i = 0, ii = arguments.length; i < ii; i++)
addListItem(this, arguments[i]);
},
/**
* Number of elements in this list.
* @type {Number}
*/
get length() listNS(this).keyValueMap.length,
/**
* Returns a string representing this list.
* @returns {String}
*/
toString: function toString() 'List(' + listNS(this).keyValueMap + ')',
/**
* 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 = listNS(this).keyValueMap.slice(0),
i = -1;
for each(let element in array)
yield onKeyValue ? [++i, element] : onKeys ? ++i : element;
}
});
exports.List = List;
function addListItem(that, value) {
let list = listNS(that).keyValueMap,
index = list.indexOf(value);
if (-1 === index) {
try {
that[that.length] = value;
}
catch (e) {}
list.push(value);
}
}
exports.addListItem = addListItem;
function removeListItem(that, element) {
let list = listNS(that).keyValueMap,
index = list.indexOf(element);
if (0 <= index) {
list.splice(index, 1);
try {
for (let length = list.length; index < length; index++)
that[index] = list[index];
that[list.length] = undefined;
}
catch(e){}
}
}
exports.removeListItem = removeListItem;
exports.listNS = listNS;
|
