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698 lines
18 KiB
JavaScript
698 lines
18 KiB
JavaScript
/**
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* Various utilities.
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*
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* @author Alain Pitiot
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* @version 3.2.0
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* @copyright (c) 2019 Ilixa Ltd. ({@link http://ilixa.com})
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* @license Distributed under the terms of the MIT License
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*/
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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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constructor(superclass) {
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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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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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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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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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throw Error('');
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} catch(error) {
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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') return true;
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if (!Array.isArray(x)) return false;
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if (x.length === 0) return true;
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if (x.length === 1 && typeof x[0] === 'undefined') return true;
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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/questions/9847580/how-to-detect-safari-chrome-ie-firefox-and-opera-browser </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', 'Chrome', 'Blink", '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) return 'Opera';
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// Firefox 1.0+
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const isFirefox = typeof InstallTrigger !== 'undefined';
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if (isFirefox) return 'Firefox';
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// Safari 3.0+ "[object HTMLElementConstructor]"
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const isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && safari.pushNotification));
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if (isSafari) return 'Safari';
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// Internet Explorer 6-11
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const isIE = /*@cc_on!@*/false || !!document.documentMode;
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if (isIE) return 'IE';
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// Edge 20+
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const isEdge = !isIE && !!window.StyleMedia;
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if (isEdge) return 'Edge';
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// Chrome 1+
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const isChrome = !!window.chrome && !!window.chrome.webstore;
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if (isChrome) return 'Chrome';
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// Blink engine detection
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const isBlink = (isChrome || isOpera) && !!window.CSS;
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if (isBlink) return 'Blink';
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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 = { origin: 'util.toNumerical', context: 'when converting an object to its numerical form' };
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if (typeof obj === 'number')
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return obj;
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if (typeof obj === 'string')
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obj = [obj];
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if (Array.isArray(obj)) {
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return obj.map( e => {
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let n = Number.parseFloat(e);
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if (Number.isNaN(n))
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Object.assign(response, { error: 'unable to convert: ' + e + ' to a' +
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' number.'});
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return n;
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});
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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) isInside = !isInside;
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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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* @return {Object[]} the shuffled array
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*/
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export function shuffle(array)
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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(Math.random() * (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 = { origin: 'util.getPositionFromObject', context: 'when getting the position of an object' };
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try {
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if (typeof object === 'undefined')
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throw 'cannot get the position of an undefined object';
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let objectWin = undefined;
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// object has a getPos function:
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if (typeof object.getPos === 'function') {
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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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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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* @returns {number[]} the position in pixel units
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*/
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export function to_px(pos, posUnit, win)
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{
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const response = { origin: 'util.to_px', context: 'when converting a position to pixel units' };
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if (posUnit === 'pix')
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return pos;
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else if (posUnit === 'norm')
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return [pos[0] * win.size[0]/2.0, pos[1] * win.size[1]/2.0];
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else if (posUnit === 'height') {
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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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else
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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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* 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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return pos;
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if (posUnit === 'pix')
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return [pos[0] / (win.size[0]/2.0), pos[1] / (win.size[1]/2.0)];
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if (posUnit === 'height') {
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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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* 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 = { origin: 'util.to_height', context: 'when converting a position to height units' };
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if (posUnit === 'height')
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return pos;
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if (posUnit === 'pix') {
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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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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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* 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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try {
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if (win._units === 'pix')
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return to_px(pos, posUnit, win);
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if (win._units === 'norm')
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return to_norm(pos, posUnit, win);
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if (win._units === 'height')
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return to_height(pos, posUnit, win);
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throw `unknown window units: ${win._units}`;
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} catch (error) {
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throw Object.assign(response, { response, error });
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}
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}
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/**
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* Convert the position to given units.
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*
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* @name module:util.to_unit
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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 {string} targetUnit - the target units
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* @returns {number[]} the position in target units
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*/
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export function to_unit(pos, posUnit, win, targetUnit)
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{
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const response = { origin: 'util.to_unit', context: 'when converting a position to different units' };
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try {
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if (targetUnit === 'pix')
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return to_px(pos, posUnit, win);
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if (targetUnit === 'norm')
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return to_norm(pos, posUnit, win);
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if (targetUnit === 'height')
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return to_height(pos, posUnit, win);
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throw `unknown target units: ${targetUnit}`;
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} catch (error) {
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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 a position to a PIXI Point.
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*
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* @name module:util.to_pixiPoint
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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 as a PIXI Point
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*/
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export function to_pixiPoint(pos, posUnit, win)
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{
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const pos_px = to_px(pos, posUnit, win);
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return new PIXI.Point(pos_px[0], pos_px[1]);
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}
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/**
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* Convert an object to its string representation, taking care of symbols.
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*
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* <p>Note: if the object is not already a string, we JSON stringify it and detect circularity.</p>
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*
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* @name module:util.toString
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* @function
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* @public
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* @param {Object} object - the input object
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* @return {string} a string representation of the object or 'Object (circular)'
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*/
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export function toString(object)
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{
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if (typeof object === 'string')
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return object;
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try {
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const symbolReplacer = (key, value) => {
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if (typeof value === 'symbol')
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value = Symbol.keyFor(value);
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return value;
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};
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return JSON.stringify(object, symbolReplacer);
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} catch (e)
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{
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return 'Object (circular)';
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}
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}
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if (!String.prototype.format) {
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String.prototype.format = function() {
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var args = arguments;
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return this
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.replace(/{(\d+)}/g, function(match, number) {
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return typeof args[number] != 'undefined' ? args[number] : match;
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})
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.replace(/{([$_a-zA-Z][$_a-zA-Z0-9]*)}/g, function(match, name) {
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//console.log("n=" + name + " args[0][name]=" + args[0][name]);
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return args.length > 0 && args[0][name] !== undefined
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? args[0][name]
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: match
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;
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});
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};
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}
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/**
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* Test whether an object is either an integer or the string representation of an integer.
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* <p>This is adapted from: https://stackoverflow.com/a/14794066</p>
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*
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* @name module:util.isInt
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* @function
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* @public
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* @param {Object} obj - the input object
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* @returns {boolean} whether or not the object is an integer or the string representation of an integer
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*/
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export function isInt(obj) {
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if (isNaN(obj))
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return false;
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const x = parseFloat(obj);
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return (x | 0) === x;
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}
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/**
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* Get the URL parameters.
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*
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* @name module:util.getUrlParameters
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* @function
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* @public
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* @returns {URLSearchParams} the iterable URLSearchParams
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*
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* @example
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* const urlParameters = util.getUrlParameters();
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* 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)
|
|
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))
|
|
return array.filter( (e,i) => (selection.includes(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.
|
|
*
|
|
* @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 {
|
|
let elem = window.document.createElement('a');
|
|
elem.href = window.URL.createObjectURL(blob);
|
|
elem.download = filename;
|
|
document.body.appendChild(elem);
|
|
elem.click();
|
|
document.body.removeChild(elem);
|
|
}
|
|
} |