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1510 lines
36 KiB
HTML
1510 lines
36 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>JSDoc: Source: util/Util.js</title>
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<script src="scripts/prettify/prettify.js"> </script>
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<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">Source: util/Util.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* Various utilities.
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*
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* @authors Alain Pitiot, Sotiri Bakagiannis, Thomas Pronk
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* @version 2021.2.0
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* @copyright (c) 2017-2020 Ilixa Ltd. (http://ilixa.com) (c) 2020-2021 Open Science Tools Ltd. (https://opensciencetools.org)
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* @license Distributed under the terms of the MIT License
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*/
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import * as PIXI from 'pixi.js-legacy';
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/**
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* Syntactic sugar for Mixins
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*
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* <p>This is heavily adapted from: http://justinfagnani.com/2015/12/21/real-mixins-with-javascript-classes/</p>
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*
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* @name module:util.MixinBuilder
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* @class
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* @param {Object} superclass
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*
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* @example
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* class BaseClass { ... }
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* let Mixin1 = (superclass) => class extends superclass { ... }
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* let Mixin2 = (superclass) => class extends superclass { ... }
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* class NewClass extends mix(BaseClass).with(Mixin1, Mixin2) { ... }
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*/
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export let mix = (superclass) => new MixinBuilder(superclass);
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class MixinBuilder
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{
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constructor(superclass)
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{
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this.superclass = superclass;
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}
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/**
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*
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* @param mixins
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* @returns {*}
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*/
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with(...mixins)
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{
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return mixins.reduce((c, mixin) => mixin(c), this.superclass);
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}
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}
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/**
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* Convert the resulting value of a promise into a tupple.
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*
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* @name module:util.promiseToTupple
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* @function
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* @public
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* @param {Promise} promise - the promise
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* @return {Object[]} the resulting value in the format [error, return data]
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* where error is null if there was no error
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*/
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export function promiseToTupple(promise)
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{
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return promise
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.then(data => [null, data])
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.catch(error => [error, null]);
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}
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/**
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* Get a Universally Unique Identifier (RFC4122 version 4)
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* <p> See details here: https://www.ietf.org/rfc/rfc4122.txt</p>
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*
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* @name module:util.makeUuid
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* @function
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* @public
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* @return {string} the uuid
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*/
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export function makeUuid()
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{
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c)
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{
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const r = Math.random() * 16 | 0, v = (c === 'x') ? r : (r & 0x3 | 0x8);
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return v.toString(16);
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});
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}
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/**
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* Get the error stack of the calling, exception-throwing function.
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*
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* @name module:util.getErrorStack
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* @function
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* @public
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* @return {string} the error stack as a string
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*/
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export function getErrorStack()
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{
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try
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{
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throw Error('');
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}
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catch (error)
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{
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// we need to remove the second line since it references getErrorStack:
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let stack = error.stack.split("\n");
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stack.splice(1, 1);
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return JSON.stringify(stack.join('\n'));
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}
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}
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/**
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* Test if x is an 'empty' value.
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*
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* @name module:util.isEmpty
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* @function
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* @public
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* @param {Object} x the value to test
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* @return {boolean} true if x is one of the following: undefined, [], [undefined]
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*/
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export function isEmpty(x)
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{
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if (typeof x === 'undefined')
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{
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return true;
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}
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if (!Array.isArray(x))
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{
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return false;
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}
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if (x.length === 0)
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{
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return true;
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}
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if (x.length === 1 && typeof x[0] === 'undefined')
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{
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return true;
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}
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return false;
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}
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/**
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* Detect the user's browser.
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*
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* <p> Note: since user agent is easily spoofed, we use a more sophisticated approach, as described here:
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* https://stackoverflow.com/a/9851769</p>
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*
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* @name module:util.detectBrowser
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* @function
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* @public
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* @return {string} the detected browser, one of 'Opera', 'Firefox', 'Safari',
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* 'IE', 'Edge', 'EdgeChromium', 'Chrome', 'unknown'
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*/
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export function detectBrowser()
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{
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// Opera 8.0+
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const isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
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if (isOpera)
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{
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return 'Opera';
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}
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// Firefox 1.0+
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const isFirefox = (typeof InstallTrigger !== 'undefined');
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if (isFirefox)
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{
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return 'Firefox';
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}
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// Safari 3.0+ "[object HTMLElementConstructor]"
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const isSafari = /constructor/i.test(window.HTMLElement) || (function (p)
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{
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return p.toString() === "[object SafariRemoteNotification]";
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})(!window['safari'] || (typeof safari !== 'undefined' && safari.pushNotification));
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if (isSafari)
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{
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return 'Safari';
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}
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// Internet Explorer 6-11
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// const isIE6 = !window.XMLHttpRequest;
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// const isIE7 = document.all && window.XMLHttpRequest && !XDomainRequest && !window.opera;
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// const isIE8 = document.documentMode==8;
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const isIE = /*@cc_on!@*/false || !!document.documentMode;
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if (isIE)
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{
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return 'IE';
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}
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// Edge 20+
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const isEdge = !isIE && !!window.StyleMedia;
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if (isEdge)
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{
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return 'Edge';
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}
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// Chrome 1+
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const isChrome = window.chrome;
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if (isChrome)
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{
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return 'Chrome';
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}
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// Chromium-based Edge:
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const isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") !== -1);
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if (isEdgeChromium)
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{
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return 'EdgeChromium';
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}
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// Blink engine detection
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const isBlink = (isChrome || isOpera) && !!window.CSS;
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if (isBlink)
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{
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return 'Blink';
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}
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return 'unknown';
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}
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/**
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* Convert obj to its numerical form.
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*
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* <ul>
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* <li>number -> number, e.g. 2 -> 2</li>
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* <li>[number] -> [number], e.g. [1,2,3] -> [1,2,3]</li>
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* <li>numeral string -> number, e.g. "8" -> 8</li>
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* <li>[number | numeral string] -> [number], e.g. [1, 2, "3"] -> [1,2,3]</li>
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* </ul>
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*
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* @name module:util.toNumerical
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* @function
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* @public
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* @param {Object} obj - the input object
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* @return {number | number[]} the numerical form of the input object
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*/
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export function toNumerical(obj)
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{
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const response = {
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origin: 'util.toNumerical',
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context: 'when converting an object to its numerical form'
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};
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try
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{
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if (obj === null)
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{
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throw 'unable to convert null to a number';
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}
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if (typeof obj === 'undefined')
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{
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throw 'unable to convert undefined to a number';
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}
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if (typeof obj === 'number')
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{
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return obj;
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}
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const convertToNumber = (input) =>
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{
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const n = Number.parseFloat(input);
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if (Number.isNaN(n))
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{
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throw `unable to convert ${input} to a number`;
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}
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return n;
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};
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if (Array.isArray(obj))
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{
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return obj.map(convertToNumber);
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}
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const arrayMaybe = turnSquareBracketsIntoArrays(obj);
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if (Array.isArray(arrayMaybe))
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{
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return arrayMaybe.map(convertToNumber);
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}
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if (typeof obj === 'string')
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{
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return convertToNumber(obj);
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}
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throw 'unable to convert the object to a number';
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}
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catch (error)
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{
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throw Object.assign(response, { error });
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}
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}
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/**
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* Check whether a point lies within a polygon
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* <p>We are using the algorithm described here: https://wrf.ecse.rpi.edu//Research/Short_Notes/pnpoly.html</p>
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*
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* @name module:util.IsPointInsidePolygon
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* @function
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* @public
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* @param {number[]} point - the point
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* @param {Object} vertices - the vertices defining the polygon
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* @return {boolean} whether or not the point lies within the polygon
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*/
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export function IsPointInsidePolygon(point, vertices)
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{
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const x = point[0];
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const y = point[1];
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let isInside = false;
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for (let i = 0, j = vertices.length - 1; i < vertices.length; j = i++)
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{
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const xi = vertices[i][0], yi = vertices[i][1];
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const xj = vertices[j][0], yj = vertices[j][1];
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const intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
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if (intersect)
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{
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isInside = !isInside;
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}
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}
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return isInside;
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}
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/**
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* Shuffle an array in place using the Fisher-Yastes's modern algorithm
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* <p>See details here: https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#The_modern_algorithm</p>
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*
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* @name module:util.shuffle
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* @function
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* @public
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* @param {Object[]} array - the input 1-D array
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* @param {Function} [randomNumberGenerator = undefined] - A function used to generated random numbers in the interal [0, 1). Defaults to Math.random
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* @return {Object[]} the shuffled array
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*/
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export function shuffle(array, randomNumberGenerator = undefined)
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{
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if (randomNumberGenerator === undefined) {
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randomNumberGenerator = Math.random;
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}
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for (let i = array.length - 1; i > 0; i--)
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{
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const j = Math.floor(randomNumberGenerator() * (i + 1));
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[array[i], array[j]] = [array[j], array[i]];
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}
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return array;
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}
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/**
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* Get the position of the object, in pixel units
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*
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* @name module:util.getPositionFromObject
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* @function
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* @public
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* @param {Object} object - the input object
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* @param {string} units - the units
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* @returns {number[]} the position of the object, in pixel units
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*/
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export function getPositionFromObject(object, units)
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{
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const response = {
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origin: 'util.getPositionFromObject',
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context: 'when getting the position of an object'
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};
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try
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{
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if (typeof object === 'undefined')
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{
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throw 'cannot get the position of an undefined object';
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}
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let objectWin = undefined;
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// the object has a getPos function:
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if (typeof object.getPos === 'function')
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{
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units = object.units;
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objectWin = object.win;
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object = object.getPos();
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}
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// convert object to pixel units:
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return to_px(object, units, objectWin);
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}
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catch (error)
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{
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throw Object.assign(response, {error});
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}
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}
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/**
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* Convert the position to pixel units.
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*
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* @name module:util.to_px
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* @function
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* @public
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* @param {number[]} pos - the input position
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* @param {string} posUnit - the position units
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* @param {Window} win - the associated Window
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* @param {boolean} [integerCoordinates = false] - whether or not to round the position coordinates.
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* @returns {number[]} the position in pixel units
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*/
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export function to_px(pos, posUnit, win, integerCoordinates = false)
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{
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const response = {
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origin: 'util.to_px',
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context: 'when converting a position to pixel units'
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};
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let pos_px;
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if (posUnit === 'pix')
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{
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pos_px = pos;
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}
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else if (posUnit === 'norm')
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{
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pos_px = [pos[0] * win.size[0] / 2.0, pos[1] * win.size[1] / 2.0];
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}
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else if (posUnit === 'height')
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{
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const minSize = Math.min(win.size[0], win.size[1]);
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pos_px = [pos[0] * minSize, pos[1] * minSize];
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}
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else
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{
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throw Object.assign(response, {error: `unknown position units: ${posUnit}`});
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}
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if (integerCoordinates)
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{
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return [Math.round(pos_px[0]), Math.round(pos_px[1])];
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}
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else
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{
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return pos_px;
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}
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}
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/**
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* Convert the position to norm units.
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*
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* @name module:util.to_norm
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* @function
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* @public
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* @param {number[]} pos - the input position
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* @param {string} posUnit - the position units
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* @param {Window} win - the associated Window
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* @returns {number[]} the position in norm units
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*/
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export function to_norm(pos, posUnit, win)
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{
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const response = {origin: 'util.to_norm', context: 'when converting a position to norm units'};
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if (posUnit === 'norm')
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{
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return pos;
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}
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if (posUnit === 'pix')
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{
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return [pos[0] / (win.size[0] / 2.0), pos[1] / (win.size[1] / 2.0)];
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}
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if (posUnit === 'height')
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{
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const minSize = Math.min(win.size[0], win.size[1]);
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return [pos[0] * minSize / (win.size[0] / 2.0), pos[1] * minSize / (win.size[1] / 2.0)];
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}
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throw Object.assign(response, {error: `unknown position units: ${posUnit}`});
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}
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|
|
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|
/**
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* Convert the position to height units.
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|
*
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|
* @name module:util.to_height
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|
* @function
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|
* @public
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|
* @param {number[]} pos - the input position
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|
* @param {string} posUnit - the position units
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|
* @param {Window} win - the associated Window
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* @returns {number[]} the position in height units
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*/
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export function to_height(pos, posUnit, win)
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|
{
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const response = {
|
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origin: 'util.to_height',
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context: 'when converting a position to height units'
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|
};
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|
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if (posUnit === 'height')
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{
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return pos;
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}
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if (posUnit === 'pix')
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{
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const minSize = Math.min(win.size[0], win.size[1]);
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return [pos[0] / minSize, pos[1] / minSize];
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}
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if (posUnit === 'norm')
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{
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const minSize = Math.min(win.size[0], win.size[1]);
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return [pos[0] * win.size[0] / 2.0 / minSize, pos[1] * win.size[1] / 2.0 / minSize];
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}
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throw Object.assign(response, {error: `unknown position units: ${posUnit}`});
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}
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|
|
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|
/**
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|
* Convert the position to window units.
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|
*
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* @name module:util.to_win
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|
* @function
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|
* @public
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|
* @param {number[]} pos - the input position
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* @param {string} posUnit - the position units
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* @param {Window} win - the associated Window
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* @returns {number[]} the position in window units
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|
*/
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|
export function to_win(pos, posUnit, win)
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|
{
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const response = {origin: 'util.to_win', context: 'when converting a position to window units'};
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|
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try
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{
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if (win._units === 'pix')
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{
|
|
return to_px(pos, posUnit, win);
|
|
}
|
|
if (win._units === 'norm')
|
|
{
|
|
return to_norm(pos, posUnit, win);
|
|
}
|
|
if (win._units === 'height')
|
|
{
|
|
return to_height(pos, posUnit, win);
|
|
}
|
|
|
|
throw `unknown window units: ${win._units}`;
|
|
}
|
|
catch (error)
|
|
{
|
|
throw Object.assign(response, {response, error});
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Convert the position to given units.
|
|
*
|
|
* @name module:util.to_unit
|
|
* @function
|
|
* @public
|
|
* @param {number[]} pos - the input position
|
|
* @param {string} posUnit - the position units
|
|
* @param {Window} win - the associated Window
|
|
* @param {string} targetUnit - the target units
|
|
* @returns {number[]} the position in target units
|
|
*/
|
|
export function to_unit(pos, posUnit, win, targetUnit)
|
|
{
|
|
const response = {origin: 'util.to_unit', context: 'when converting a position to different units'};
|
|
|
|
try
|
|
{
|
|
if (targetUnit === 'pix')
|
|
{
|
|
return to_px(pos, posUnit, win);
|
|
}
|
|
if (targetUnit === 'norm')
|
|
{
|
|
return to_norm(pos, posUnit, win);
|
|
}
|
|
if (targetUnit === 'height')
|
|
{
|
|
return to_height(pos, posUnit, win);
|
|
}
|
|
|
|
throw `unknown target units: ${targetUnit}`;
|
|
}
|
|
catch (error)
|
|
{
|
|
throw Object.assign(response, {error});
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Convert a position to a PIXI Point.
|
|
*
|
|
* @name module:util.to_pixiPoint
|
|
* @function
|
|
* @public
|
|
* @param {number[]} pos - the input position
|
|
* @param {string} posUnit - the position units
|
|
* @param {Window} win - the associated Window
|
|
* @param {boolean} [integerCoordinates = false] - whether or not to round the PIXI Point coordinates.
|
|
* @returns {number[]} the position as a PIXI Point
|
|
*/
|
|
export function to_pixiPoint(pos, posUnit, win, integerCoordinates = false)
|
|
{
|
|
const pos_px = to_px(pos, posUnit, win);
|
|
if (integerCoordinates)
|
|
{
|
|
return new PIXI.Point(Math.round(pos_px[0]), Math.round(pos_px[1]));
|
|
}
|
|
else
|
|
{
|
|
return new PIXI.Point(pos_px[0], pos_px[1]);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Convert an object to its string representation, taking care of symbols.
|
|
*
|
|
* <p>Note: if the object is not already a string, we JSON stringify it and detect circularity.</p>
|
|
*
|
|
* @name module:util.toString
|
|
* @function
|
|
* @public
|
|
* @param {Object} object - the input object
|
|
* @return {string} a string representation of the object or 'Object (circular)'
|
|
*/
|
|
export function toString(object)
|
|
{
|
|
if (typeof object === 'undefined')
|
|
{
|
|
return 'undefined';
|
|
}
|
|
|
|
if (!object)
|
|
{
|
|
return 'null';
|
|
}
|
|
|
|
if (typeof object === 'string')
|
|
{
|
|
return object;
|
|
}
|
|
|
|
// if the object is a class and has a toString method:
|
|
if (object.constructor.toString().substring(0, 5) === 'class' && typeof object.toString === 'function')
|
|
{
|
|
return object.toString();
|
|
}
|
|
|
|
try
|
|
{
|
|
const symbolReplacer = (key, value) =>
|
|
{
|
|
if (typeof value === 'symbol')
|
|
{
|
|
value = Symbol.keyFor(value);
|
|
}
|
|
return value;
|
|
};
|
|
return JSON.stringify(object, symbolReplacer);
|
|
}
|
|
catch (e)
|
|
{
|
|
return 'Object (circular)';
|
|
}
|
|
}
|
|
|
|
|
|
if (!String.prototype.format)
|
|
{
|
|
String.prototype.format = function ()
|
|
{
|
|
var args = arguments;
|
|
return this
|
|
.replace(/{(\d+)}/g, function (match, number)
|
|
{
|
|
return typeof args[number] != 'undefined' ? args[number] : match;
|
|
})
|
|
.replace(/{([$_a-zA-Z][$_a-zA-Z0-9]*)}/g, function (match, name)
|
|
{
|
|
//console.log("n=" + name + " args[0][name]=" + args[0][name]);
|
|
return args.length > 0 && args[0][name] !== undefined ? args[0][name] : match;
|
|
});
|
|
};
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the most informative error from the server response from a jquery server request.
|
|
*
|
|
* @name module:util.getRequestError
|
|
* @function
|
|
* @public
|
|
* @param jqXHR
|
|
* @param textStatus
|
|
* @param errorThrown
|
|
*/
|
|
export function getRequestError(jqXHR, textStatus, errorThrown)
|
|
{
|
|
let errorMsg = 'unknown error';
|
|
|
|
if (typeof jqXHR.responseJSON !== 'undefined')
|
|
{
|
|
errorMsg = jqXHR.responseJSON;
|
|
}
|
|
else if (typeof jqXHR.responseText !== 'undefined')
|
|
{
|
|
errorMsg = jqXHR.responseText;
|
|
}
|
|
else if (typeof errorThrown !== 'undefined')
|
|
{
|
|
errorMsg = errorThrown;
|
|
}
|
|
|
|
return errorMsg;
|
|
}
|
|
|
|
|
|
/**
|
|
* Test whether an object is either an integer or the string representation of an integer.
|
|
* <p>This is adapted from: https://stackoverflow.com/a/14794066</p>
|
|
*
|
|
* @name module:util.isInt
|
|
* @function
|
|
* @public
|
|
* @param {Object} obj - the input object
|
|
* @returns {boolean} whether or not the object is an integer or the string representation of an integer
|
|
*/
|
|
export function isInt(obj)
|
|
{
|
|
if (isNaN(obj))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
const x = parseFloat(obj);
|
|
return (x | 0) === x;
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the URL parameters.
|
|
*
|
|
* @name module:util.getUrlParameters
|
|
* @function
|
|
* @public
|
|
* @returns {URLSearchParams} the iterable URLSearchParams
|
|
*
|
|
* @example
|
|
* const urlParameters = util.getUrlParameters();
|
|
* for (const [key, value] of urlParameters)
|
|
* console.log(key + ' = ' + value);
|
|
*
|
|
*/
|
|
export function getUrlParameters()
|
|
{
|
|
const urlQuery = window.location.search.slice(1);
|
|
return new URLSearchParams(urlQuery);
|
|
|
|
/*let urlMap = new Map();
|
|
for (const entry of urlParameters)
|
|
urlMap.set(entry[0], entry[1])
|
|
|
|
return urlMap;*/
|
|
}
|
|
|
|
|
|
/**
|
|
* Add info extracted from the URL to the given dictionary.
|
|
*
|
|
* <p>We exclude all URL parameters starting with a double underscore
|
|
* since those are reserved for client/server communication</p>
|
|
*
|
|
* @name module:util.addInfoFromUrl
|
|
* @function
|
|
* @public
|
|
* @param {Object} info - the dictionary
|
|
*/
|
|
export function addInfoFromUrl(info)
|
|
{
|
|
const infoFromUrl = getUrlParameters();
|
|
|
|
// note: parameters starting with a double underscore are reserved for client/server communication,
|
|
// we do not add them to info
|
|
// for (const [key, value] of infoFromUrl)
|
|
infoFromUrl.forEach((value, key) =>
|
|
{
|
|
if (key.indexOf('__') !== 0)
|
|
{
|
|
info[key] = value;
|
|
}
|
|
});
|
|
|
|
return info;
|
|
}
|
|
|
|
|
|
/**
|
|
* Select values from an array.
|
|
*
|
|
* <p> 'selection' can be a single integer, an array of indices, or a string to be parsed, e.g.:
|
|
* <ul>
|
|
* <li>5</li>
|
|
* <li>[1,2,3,10]</li>
|
|
* <li>'1,5,10'</li>
|
|
* <li>'1:2:5'</li>
|
|
* <li>'5:'</li>
|
|
* <li>'-5:-2, 9, 11:5:22'</li>
|
|
* </ul></p>
|
|
*
|
|
* @name module:util.selectFromArray
|
|
* @function
|
|
* @public
|
|
* @param {Array.<Object>} array - the input array
|
|
* @param {number | Array.<number> | string} selection - the selection
|
|
* @returns {Object | Array.<Object>} the array of selected items
|
|
*/
|
|
export function selectFromArray(array, selection)
|
|
{
|
|
|
|
// if selection is an integer, or a string representing an integer, we treat it as an index in the array
|
|
// and return that entry:
|
|
if (isInt(selection))
|
|
{
|
|
return [array[parseInt(selection)]];
|
|
}// if selection is an array, we treat it as a list of indices
|
|
// and return an array with the entries corresponding to those indices:
|
|
else if (Array.isArray(selection))
|
|
{
|
|
// Pick out `array` items matching indices contained in `selection` in order
|
|
return selection.map(i => array[i]);
|
|
}// if selection is a string, we decode it:
|
|
else if (typeof selection === 'string')
|
|
{
|
|
if (selection.indexOf(',') > -1)
|
|
{
|
|
return selection.split(',').map(a => selectFromArray(array, a));
|
|
}// return flattenArray( selection.split(',').map(a => selectFromArray(array, a)) );
|
|
else if (selection.indexOf(':') > -1)
|
|
{
|
|
let sliceParams = selection.split(':').map(a => parseInt(a));
|
|
if (sliceParams.length === 3)
|
|
{
|
|
return sliceArray(array, sliceParams[0], sliceParams[2], sliceParams[1]);
|
|
}
|
|
else
|
|
{
|
|
return sliceArray(array, ...sliceParams);
|
|
}
|
|
}
|
|
}
|
|
|
|
else
|
|
{
|
|
throw {
|
|
origin: 'selectFromArray',
|
|
context: 'when selecting entries from an array',
|
|
error: 'unknown selection type: ' + (typeof selection)
|
|
};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Recursively flatten an array of arrays.
|
|
*
|
|
* @name module:util.flattenArray
|
|
* @function
|
|
* @public
|
|
* @param {Array.<Object>} array - the input array of arrays
|
|
* @returns {Array.<Object>} the flatten array
|
|
*/
|
|
export function flattenArray(array)
|
|
{
|
|
return array.reduce(
|
|
(flat, next) =>
|
|
{
|
|
flat.push((Array.isArray(next) && Array.isArray(next[0])) ? flattenArray(next) : next);
|
|
return flat;
|
|
},
|
|
[]
|
|
);
|
|
}
|
|
|
|
|
|
/**
|
|
* Slice an array.
|
|
*
|
|
* @name module:util.sliceArray
|
|
* @function
|
|
* @public
|
|
* @param {Array.<Object>} array - the input array
|
|
* @param {number} [from= NaN] - the start of the slice
|
|
* @param {number} [to= NaN] - the end of the slice
|
|
* @param {number} [step= NaN] - the step of the slice
|
|
* @returns {Array.<Object>} the array slice
|
|
*/
|
|
export function sliceArray(array, from = NaN, to = NaN, step = NaN)
|
|
{
|
|
if (isNaN(from))
|
|
{
|
|
from = 0;
|
|
}
|
|
if (isNaN(to))
|
|
{
|
|
to = array.length;
|
|
}
|
|
|
|
let arraySlice = array.slice(from, to);
|
|
|
|
if (isNaN(step))
|
|
{
|
|
return arraySlice;
|
|
}
|
|
|
|
if (step < 0)
|
|
{
|
|
arraySlice.reverse();
|
|
}
|
|
|
|
step = Math.abs(step);
|
|
if (step === 1)
|
|
{
|
|
return arraySlice;
|
|
}
|
|
else
|
|
{
|
|
return arraySlice.filter((e, i) => (i % step === 0));
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Offer data as download in the browser.
|
|
*
|
|
* @name module:util.offerDataForDownload
|
|
* @function
|
|
* @public
|
|
* @param {string} filename - the name of the file to be downloaded
|
|
* @param {*} data - the data
|
|
* @param {string} type - the MIME type of the data, e.g. 'text/csv' or 'application/json'
|
|
*/
|
|
export function offerDataForDownload(filename, data, type)
|
|
{
|
|
const blob = new Blob([data], {type});
|
|
if (window.navigator.msSaveOrOpenBlob)
|
|
{
|
|
window.navigator.msSaveBlob(blob, filename);
|
|
}
|
|
else
|
|
{
|
|
const anchor = document.createElement('a');
|
|
anchor.href = window.URL.createObjectURL(blob);
|
|
anchor.download = filename;
|
|
document.body.appendChild(anchor);
|
|
anchor.click();
|
|
document.body.removeChild(anchor);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Convert a string representing a JSON array, e.g. "[1, 2]" into an array, e.g. ["1","2"].
|
|
* This approach overcomes the built-in JSON parsing limitations when it comes to eg. floats
|
|
* missing the naught prefix, and is able to process several arrays, e.g. "[1,2][3,4]".
|
|
*
|
|
* @name module:util.turnSquareBracketsIntoArrays
|
|
* @function
|
|
* @public
|
|
* @param {string} input - string potentially containing JSON arrays
|
|
* @param {string} max - how many matches to return, unwrap resulting array if less than two
|
|
* @returns {array} an array if arrays were found, undefined otherwise
|
|
*/
|
|
export function turnSquareBracketsIntoArrays(input, max = 1)
|
|
{
|
|
// Only interested in strings
|
|
// https://stackoverflow.com/questions/4059147
|
|
if (String(input) !== input)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Matches content within square brackets (using literal
|
|
// form is MDN's advice for patterns unlikely to change)
|
|
const matchesMaybe = input.match(/\[(.*?)\]/g);
|
|
|
|
// Exit if no array-like matches found
|
|
if (matchesMaybe === null)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Reformat content for each match
|
|
const matches = matchesMaybe.map((data) =>
|
|
{
|
|
return data
|
|
// Remove the square brackets
|
|
.replace(/[\[\]]+/g, '')
|
|
// Eat up space after comma
|
|
.split(/[, ]+/);
|
|
}
|
|
);
|
|
|
|
if (max < 2)
|
|
{
|
|
return matches[0];
|
|
}
|
|
|
|
return matches;
|
|
}
|
|
|
|
|
|
/**
|
|
* Generates random integers a-la NumPy's in the "half-open" interval [min, max). In other words, from min inclusive to max exclusive. When max is undefined, as is the case by default, results are chosen from [0, min). An error is thrown if max is less than min.
|
|
*
|
|
* @name module:util.randint
|
|
* @function
|
|
* @public
|
|
* @param {number} [min = 0] - lowest integer to be drawn, or highest plus one if max is undefined (default)
|
|
* @param {number} max - one above the largest integer to be drawn
|
|
* @returns {number} a random integer in the requested range (signed)
|
|
*/
|
|
export function randint(min = 0, max)
|
|
{
|
|
let lo = min;
|
|
let hi = max;
|
|
|
|
if (typeof max === 'undefined')
|
|
{
|
|
hi = lo;
|
|
lo = 0;
|
|
}
|
|
|
|
if (hi < lo)
|
|
{
|
|
throw {
|
|
origin: 'util.randint',
|
|
context: 'when generating a random integer',
|
|
error: 'min should be <= max'
|
|
};
|
|
}
|
|
|
|
return Math.floor(Math.random() * (hi - lo)) + lo;
|
|
}
|
|
|
|
|
|
/**
|
|
* Round to a certain number of decimal places.
|
|
*
|
|
* This is the Crib Sheet provided solution, but please note that as of 2020 the most popular SO answer is different.
|
|
*
|
|
* @name module:util.round
|
|
* @function
|
|
* @public
|
|
* @see {@link https://stackoverflow.com/questions/11832914|Stack Overflow}
|
|
* @param {number} input - the number to be rounded
|
|
* @param {number} places - the max number of decimals desired
|
|
* @returns {number} input rounded to the specified number of decimal places at most
|
|
*/
|
|
export function round(input, places = 0)
|
|
{
|
|
return +(Math.round(`${input}e+${places}`) + `e-${places}`);
|
|
}
|
|
|
|
|
|
/**
|
|
* Calculate the sum of the elements in the input array.
|
|
*
|
|
* If 'input' is not an array, then we return start.
|
|
*
|
|
* @name module:util.sum
|
|
* @function
|
|
* @public
|
|
* @param {array} input - an array of numbers, or of objects that can be cast into a number, e.g. ['1', 2.5, 3e1]
|
|
* @param {number} start - value added to the sum of numbers (a la Python)
|
|
* @returns {number} the sum of the elements in the array + start
|
|
*/
|
|
export function sum(input = [], start = 0)
|
|
{
|
|
if (!Array.isArray(input))
|
|
{
|
|
return start;
|
|
}
|
|
|
|
const add = (a, b) => a + b;
|
|
|
|
return input
|
|
// type cast everything as a number
|
|
.map(value => Number(value))
|
|
// drop non numeric looking entries (note: needs transpiling for IE11)
|
|
.filter(value => Number.isNaN(value) === false)
|
|
// add up each successive entry, starting with start
|
|
.reduce(add, start);
|
|
}
|
|
|
|
|
|
/**
|
|
* Calculate the average of the elements in the input array.
|
|
*
|
|
* If 'input' is not an array, or if it is an empty array, then we return 0.
|
|
*
|
|
* @name module:util.average
|
|
* @function
|
|
* @public
|
|
* @param {array} input - an array of numbers, or of objects that can be cast into a number, e.g. ['1', 2.5, 3e1]
|
|
* @returns {number} the average of the elements in the array
|
|
*/
|
|
export function average(input = [])
|
|
{
|
|
if (!Array.isArray(input))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
if (input.length === 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
return sum(input, 0) / input.length;
|
|
}
|
|
|
|
|
|
/**
|
|
* Sort the elements of the input array, in increasing alphabetical or numerical order.
|
|
*
|
|
* @name module:util.sort
|
|
* @function
|
|
* @public
|
|
* @param {array} input - an array of numbers or of strings
|
|
* @return {array} the sorted array
|
|
* @throws if 'input' is not an array, or if its elements are not consistent in types, or if they are not all either numbers or
|
|
* strings
|
|
*/
|
|
export function sort(input)
|
|
{
|
|
const response = {
|
|
origin: 'util.sort',
|
|
context: 'when sorting the elements of an array'
|
|
};
|
|
|
|
try
|
|
{
|
|
if (!Array.isArray(input))
|
|
{
|
|
throw 'the input argument should be an array';
|
|
}
|
|
|
|
// check the type and consistency of the array, and sort it accordingly:
|
|
const isNumberArray = input.every(element => typeof element === "number");
|
|
if (isNumberArray)
|
|
{
|
|
return input.sort((a, b) => (a - b));
|
|
}
|
|
|
|
const isStringArray = input.every(element => typeof element === "string");
|
|
if (isStringArray)
|
|
{
|
|
return input.sort();
|
|
}
|
|
|
|
throw 'the input array should either consist entirely of strings or of numbers';
|
|
}
|
|
catch (error)
|
|
{
|
|
throw {...response, error};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Create a sequence of integers.
|
|
*
|
|
* The sequence is such that the integer at index i is: start + step * i, with i >= 0 and start + step * i < stop
|
|
*
|
|
* <p> Note: this is a JavaScript implement of the Python range function, which explains the unusual management of arguments.</p>
|
|
*
|
|
* @name module:util.range
|
|
* @function
|
|
* @public
|
|
* @param {Number} [start=0] - the value of start
|
|
* @param {Number} stop - the value of stop
|
|
* @param {Number} [step=1] - the value of step
|
|
* @returns {Number[]} the range as an array of numbers
|
|
*/
|
|
export function range(...args)
|
|
{
|
|
const response = {
|
|
origin: 'util.range',
|
|
context: 'when building a range of numbers'
|
|
};
|
|
|
|
try
|
|
{
|
|
let start, stop, step;
|
|
|
|
switch (args.length)
|
|
{
|
|
case 0:
|
|
throw 'at least one argument is required';
|
|
|
|
// 1 arg: start = 0, stop = arg, step = 1
|
|
case 1:
|
|
start = 0;
|
|
stop = args[0];
|
|
step = 1;
|
|
break;
|
|
|
|
// 2 args: start = arg1, stop = arg2
|
|
case 2:
|
|
start = args[0];
|
|
stop = args[1];
|
|
step = 1;
|
|
break;
|
|
|
|
// 3 args:
|
|
case 3:
|
|
start = args[0];
|
|
stop = args[1];
|
|
step = args[2];
|
|
break;
|
|
|
|
default:
|
|
throw 'range requires at least one and at most 3 arguments'
|
|
}
|
|
|
|
if (!Number.isInteger(start)) {
|
|
throw 'start should be an integer';
|
|
}
|
|
if (!Number.isInteger(stop)) {
|
|
throw 'stop should be an integer';
|
|
}
|
|
if (!Number.isInteger(step)) {
|
|
throw 'step should be an integer';
|
|
}
|
|
|
|
// if start >= stop, the range is empty:
|
|
if (start >= stop)
|
|
{
|
|
return [];
|
|
}
|
|
|
|
let result = [];
|
|
for (let i = start; i < stop; i += step)
|
|
{
|
|
result.push(i);
|
|
}
|
|
return result;
|
|
}
|
|
catch (error)
|
|
{
|
|
throw {...response, error};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Create a boolean function that compares an input element to the given value.
|
|
*
|
|
* @name module:util._match
|
|
* @function
|
|
* @private
|
|
* @param {Number|string|object|null} value the matching value
|
|
* @return {} a function that compares an input element to the given value
|
|
*/
|
|
function _match(value)
|
|
{
|
|
const response = {
|
|
origin: 'util._match',
|
|
context: 'when creating a function that compares an input element to the given value'
|
|
};
|
|
|
|
try
|
|
{
|
|
// function:
|
|
if (typeof value === 'function')
|
|
{
|
|
throw 'the value cannot be a function';
|
|
}
|
|
|
|
// NaN:
|
|
if (Number.isNaN(value))
|
|
{
|
|
return (element) => Number.isNaN(element);
|
|
}
|
|
|
|
// null:
|
|
if (value === null)
|
|
{
|
|
return (element) => element === null;
|
|
}
|
|
|
|
// object: we compare using JSON.stringify
|
|
if (typeof value === 'object')
|
|
{
|
|
const jsonValue = JSON.stringify(value);
|
|
if (typeof jsonValue === 'undefined')
|
|
{
|
|
throw 'value could not be converted to a JSON string';
|
|
}
|
|
|
|
return (element) =>
|
|
{
|
|
const jsonElement = JSON.stringify(element);
|
|
return (jsonElement === jsonValue);
|
|
}
|
|
}
|
|
|
|
// everything else:
|
|
return (element) => element === value;
|
|
}
|
|
catch (error)
|
|
{
|
|
throw {...response, error};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Count the number of elements in the input array that match the given value.
|
|
*
|
|
* <p> Note: count is able to handle NaN, null, as well as any value convertible to a JSON string.</p>
|
|
*
|
|
* @name module:util.count
|
|
* @function
|
|
* @public
|
|
* @param {array} input the input array
|
|
* @param {Number|string|object|null} value the matching value
|
|
* @returns the number of matching elements
|
|
*/
|
|
export function count(input, value)
|
|
{
|
|
const response = {
|
|
origin: 'util.count',
|
|
context: 'when counting how many elements in the input array match the given value'
|
|
};
|
|
|
|
try
|
|
{
|
|
if (!Array.isArray(input))
|
|
{
|
|
throw 'the input argument should be an array';
|
|
}
|
|
|
|
const match = _match(value);
|
|
|
|
let nbMatches = 0;
|
|
input.forEach(element =>
|
|
{
|
|
if (match(element))
|
|
{
|
|
++ nbMatches;
|
|
}
|
|
});
|
|
return nbMatches;
|
|
}
|
|
catch (error)
|
|
{
|
|
throw {...response, error};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the index in the input array of the first element that matches the given value.
|
|
*
|
|
* <p> Note: index is able to handle NaN, null, as well as any value convertible to a JSON string.</p>
|
|
*
|
|
* @name module:util.index
|
|
* @function
|
|
* @public
|
|
* @param {array} input the input array
|
|
* @param {Number|string|object|null} value the matching value
|
|
* @returns the index of the first element that matches the value
|
|
* @throws if the input array does not contain any matching element
|
|
*/
|
|
export function index(input, value)
|
|
{
|
|
const response = {
|
|
origin: 'util.index',
|
|
context: 'when getting the index in the input array of the first element that matches the given value'
|
|
};
|
|
|
|
try
|
|
{
|
|
if (!Array.isArray(input))
|
|
{
|
|
throw 'the input argument should be an array';
|
|
}
|
|
|
|
const match = _match(value);
|
|
const index = input.findIndex(match);
|
|
|
|
if (index === -1)
|
|
{
|
|
throw 'no element in the input array matches the value';
|
|
}
|
|
|
|
return index;
|
|
|
|
}
|
|
catch (error)
|
|
{
|
|
throw {...response, error};
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Return the file extension corresponding to an audio mime type.
|
|
* If the provided mimeType is not a string (e.g. null, undefined, an array)
|
|
* or unknown, then '.dat' is returned, instead of throwing an exception.
|
|
*
|
|
* @name module:util.extensionFromMimeType
|
|
* @function
|
|
* @public
|
|
* @param {string} mimeType the MIME type, e.g. 'audio/webm;codecs=opus'
|
|
* @return {string} the corresponding file extension, e.g. '.webm'
|
|
*/
|
|
export function extensionFromMimeType(mimeType)
|
|
{
|
|
if (typeof mimeType !== 'string')
|
|
{
|
|
return '.dat';
|
|
}
|
|
|
|
if (mimeType.indexOf('audio/webm') === 0)
|
|
{
|
|
return '.webm';
|
|
}
|
|
|
|
if (mimeType.indexOf('audio/ogg') === 0)
|
|
{
|
|
return '.ogg';
|
|
}
|
|
|
|
if (mimeType.indexOf('audio/wav') === 0)
|
|
{
|
|
return '.wav';
|
|
}
|
|
|
|
return '.dat';
|
|
}
|
|
</code></pre>
|
|
</article>
|
|
</section>
|
|
|
|
|
|
|
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|
|
</div>
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<nav>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-core.html">core</a></li><li><a href="module-data.html">data</a></li><li><a href="module-sound.html">sound</a></li><li><a href="module-util.html">util</a></li><li><a href="module-visual.html">visual</a></li></ul><h3>Classes</h3><ul><li><a href="module-core.BuilderKeyResponse.html">BuilderKeyResponse</a></li><li><a href="module-core.EventManager.html">EventManager</a></li><li><a href="module-core.GUI.html">GUI</a></li><li><a href="module-core.Keyboard.html">Keyboard</a></li><li><a href="module-core.KeyPress.html">KeyPress</a></li><li><a href="module-core.Logger.html">Logger</a></li><li><a href="module-core.MinimalStim.html">MinimalStim</a></li><li><a href="module-core.Mouse.html">Mouse</a></li><li><a href="module-core.PsychoJS.html">PsychoJS</a></li><li><a href="module-core.ServerManager.html">ServerManager</a></li><li><a href="module-core.Window.html">Window</a></li><li><a href="module-data.ExperimentHandler.html">ExperimentHandler</a></li><li><a href="module-data.TrialHandler.html">TrialHandler</a></li><li><a href="module-sound.AudioClip.html">AudioClip</a></li><li><a href="module-sound.AudioClipPlayer.html">AudioClipPlayer</a></li><li><a href="module-sound.Microphone.html">Microphone</a></li><li><a href="module-sound.Sound.html">Sound</a></li><li><a href="module-sound.TonePlayer.html">TonePlayer</a></li><li><a href="module-sound.TrackPlayer.html">TrackPlayer</a></li><li><a href="module-util.Clock.html">Clock</a></li><li><a href="module-util.Color.html">Color</a></li><li><a href="module-util.CountdownTimer.html">CountdownTimer</a></li><li><a href="module-util.EventEmitter.html">EventEmitter</a></li><li><a href="module-util.MixinBuilder.html">MixinBuilder</a></li><li><a href="module-util.MonotonicClock.html">MonotonicClock</a></li><li><a href="module-util.PsychObject.html">PsychObject</a></li><li><a href="module-util.Scheduler.html">Scheduler</a></li><li><a href="module-visual.ButtonStim.html">ButtonStim</a></li><li><a href="module-visual.Form.html">Form</a></li><li><a href="module-visual.ImageStim.html">ImageStim</a></li><li><a href="module-visual.MovieStim.html">MovieStim</a></li><li><a href="module-visual.Polygon.html">Polygon</a></li><li><a href="module-visual.Rect.html">Rect</a></li><li><a href="module-visual.ShapeStim.html">ShapeStim</a></li><li><a href="module-visual.Slider.html">Slider</a></li><li><a href="module-visual.TextBox.html">TextBox</a></li><li><a href="module-visual.TextStim.html">TextStim</a></li><li><a href="module-visual.VisualStim.html">VisualStim</a></li></ul><h3>Interfaces</h3><ul><li><a href="module-sound.SoundPlayer.html">SoundPlayer</a></li></ul><h3>Mixins</h3><ul><li><a href="module-core.WindowMixin.html">WindowMixin</a></li><li><a href="module-util.ColorMixin.html">ColorMixin</a></li></ul>
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</nav>
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<br class="clear">
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<footer>
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Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.7</a> on Mon Jun 21 2021 07:34:20 GMT+0200 (Central European Summer Time)
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