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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';
module.metadata = {
"stability": "experimental"
};
const { Class } = require('../core/heritage');
const listNS = require('../core/namespace').ns();
const listOptions = {
/**
* 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() {
return listNS(this).keyValueMap.length;
},
/**
* Returns a string representing this list.
* @returns {String}
*/
toString: function toString() {
return '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 (let element of array)
yield onKeyValue ? [++i, element] : onKeys ? ++i : element;
},
};
listOptions[Symbol.iterator] = function iterator() {
return listNS(this).keyValueMap.slice(0)[Symbol.iterator]();
};
const List = Class(listOptions);
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;
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