/**
* Various utilities.
*
* @author Alain Pitiot
* @version 2020.1
* @copyright (c) 2020 Ilixa Ltd. ({@link http://ilixa.com})
* @license Distributed under the terms of the MIT License
*/
/**
* Syntactic sugar for Mixins
*
* <p>This is heavily adapted from: http://justinfagnani.com/2015/12/21/real-mixins-with-javascript-classes/</p>
*
* @name module:util.MixinBuilder
* @class
* @param {Object} superclass
*
* @example
* class BaseClass { ... }
* let Mixin1 = (superclass) => class extends superclass { ... }
* let Mixin2 = (superclass) => class extends superclass { ... }
* class NewClass extends mix(BaseClass).with(Mixin1, Mixin2) { ... }
*/
export let mix = (superclass) => new MixinBuilder(superclass);
class MixinBuilder {
constructor(superclass) {
this.superclass = superclass;
}
/**
*
* @param mixins
* @returns {*}
*/
with(...mixins) {
return mixins.reduce((c, mixin) => mixin(c), this.superclass);
}
}
/**
* Convert the resulting value of a promise into a tupple.
*
* @name module:util.promiseToTupple
* @function
* @public
* @param {Promise} promise - the promise
* @return {Object[]} the resulting value in the format [error, return data]
* where error is null if there was no error
*/
export function promiseToTupple(promise) {
return promise
.then(data => [null, data])
.catch(error => [error, null]);
}
/**
* Get a Universally Unique Identifier (RFC4122 version 4)
* <p> See details here: https://www.ietf.org/rfc/rfc4122.txt</p>
*
* @name module:util.makeUuid
* @function
* @public
* @return {string} the uuid
*/
export function makeUuid()
{
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
const r = Math.random() * 16 | 0, v = (c === 'x') ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
/**
* Get the error stack of the calling, exception-throwing function.
*
* @name module:util.getErrorStack
* @function
* @public
* @return {string} the error stack as a string
*/
export function getErrorStack()
{
try {
throw Error('');
} catch(error) {
// we need to remove the second line since it references getErrorStack:
let stack = error.stack.split("\n");
stack.splice(1, 1);
return JSON.stringify(stack.join('\n'));
}
}
/**
* Test if x is an 'empty' value.
*
* @name module:util.isEmpty
* @function
* @public
* @param {Object} x the value to test
* @return {boolean} true if x is one of the following: undefined, [], [undefined]
*/
export function isEmpty(x)
{
if (typeof x === 'undefined') return true;
if (!Array.isArray(x)) return false;
if (x.length === 0) return true;
if (x.length === 1 && typeof x[0] === 'undefined') return true;
return false;
}
/**
* Detect the user's browser.
*
* <p> Note: since user agent is easily spoofed, we use a more sophisticated approach, as described here:
* https://stackoverflow.com/a/9851769</p>
*
* @name module:util.detectBrowser
* @function
* @public
* @return {string} the detected browser, one of 'Opera', 'Firefox', 'Safari',
* 'IE', 'Edge', 'EdgeChromium', 'Chrome', 'unknown'
*/
export function detectBrowser()
{
// Opera 8.0+
const isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
if (isOpera) return 'Opera';
// Firefox 1.0+
const isFirefox = (typeof InstallTrigger !== 'undefined');
if (isFirefox) return 'Firefox';
// Safari 3.0+ "[object HTMLElementConstructor]"
const isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && safari.pushNotification));
if (isSafari) return 'Safari';
// Internet Explorer 6-11
// const isIE6 = !window.XMLHttpRequest;
// const isIE7 = document.all && window.XMLHttpRequest && !XDomainRequest && !window.opera;
// const isIE8 = document.documentMode==8;
const isIE = /*@cc_on!@*/false || !!document.documentMode;
if (isIE) return 'IE';
// Edge 20+
const isEdge = !isIE && !!window.StyleMedia;
if (isEdge) return 'Edge';
// Chrome 1+
const isChrome = window.chrome;
if (isChrome) return 'Chrome';
// Chromium-based Edge:
const isEdgeChromium = isChrome && (navigator.userAgent.indexOf("Edg") !== -1);
if (isEdgeChromium) return 'EdgeChromium';
return 'unknown';
}
/**
* Convert obj to its numerical form.
*
* <ul>
* <li>number -> number, e.g. 2 -> 2</li>
* <li>[number] -> [number], e.g. [1,2,3] -> [1,2,3]</li>
* <li>numeral string -> number, e.g. "8" -> 8</li>
* <li>[number | numeral string] -> [number], e.g. [1, 2, "3"] -> [1,2,3]</li>
* </ul>
*
* @name module:util.toNumerical
* @function
* @public
* @param {Object} obj - the input object
* @return {number | number[]} the numerical form of the input object
*/
export function toNumerical(obj)
{
const response = { origin: 'util.toNumerical', context: 'when converting an object to its numerical form' };
if (typeof obj === 'number')
return obj;
if (typeof obj === 'string')
obj = [obj];
if (Array.isArray(obj)) {
return obj.map( e => {
let n = Number.parseFloat(e);
if (Number.isNaN(n))
Object.assign(response, { error: 'unable to convert: ' + e + ' to a' +
' number.'});
return n;
});
}
}
/**
* Check whether a point lies within a polygon
* <p>We are using the algorithm described here: https://wrf.ecse.rpi.edu//Research/Short_Notes/pnpoly.html</p>
*
* @name module:util.IsPointInsidePolygon
* @function
* @public
* @param {number[]} point - the point
* @param {Object} vertices - the vertices defining the polygon
* @return {boolean} whether or not the point lies within the polygon
*/
export function IsPointInsidePolygon(point, vertices)
{
const x = point[0];
const y = point[1];
let isInside = false;
for (let i = 0, j = vertices.length - 1; i < vertices.length; j = i++)
{
const xi = vertices[i][0], yi = vertices[i][1];
const xj = vertices[j][0], yj = vertices[j][1];
const intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if (intersect) isInside = !isInside;
}
return isInside;
}
/**
* Shuffle an array in place using the Fisher-Yastes's modern algorithm
* <p>See details here: https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#The_modern_algorithm</p>
*
* @name module:util.shuffle
* @function
* @public
* @param {Object[]} array - the input 1-D array
* @return {Object[]} the shuffled array
*/
export function shuffle(array)
{
for (let i = array.length - 1; i > 0; i--)
{
const j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
return array;
}
/**
* Get the position of the object in pixel units
*
* @name module:util.getPositionFromObject
* @function
* @public
* @param {Object} object - the input object
* @param {string} units - the units
* @returns {number[]} the position of the object in pixel units
*/
export function getPositionFromObject(object, units)
{
const response = { origin: 'util.getPositionFromObject', context: 'when getting the position of an object' };
try {
if (typeof object === 'undefined')
throw 'cannot get the position of an undefined object';
let objectWin = undefined;
// object has a getPos function:
if (typeof object.getPos === 'function') {
units = object.units;
objectWin = object.win;
object = object.getPos();
}
// convert object to pixel units:
return to_px(object, units, objectWin);
}
catch (error) {
throw Object.assign(response, { error });
}
}
/**
* Convert the position to pixel units.
*
* @name module:util.to_px
* @function
* @public
* @param {number[]} pos - the input position
* @param {string} posUnit - the position units
* @param {Window} win - the associated Window
* @returns {number[]} the position in pixel units
*/
export function to_px(pos, posUnit, win)
{
const response = { origin: 'util.to_px', context: 'when converting a position to pixel units' };
if (posUnit === 'pix')
return pos;
else if (posUnit === 'norm')
return [pos[0] * win.size[0]/2.0, pos[1] * win.size[1]/2.0];
else if (posUnit === 'height') {
const minSize = Math.min(win.size[0], win.size[1]);
return [pos[0] * minSize, pos[1] * minSize];
}
else
throw Object.assign(response, { error: `unknown position units: ${posUnit}` });
}
/**
* Convert the position to norm units.
*
* @name module:util.to_norm
* @function
* @public
* @param {number[]} pos - the input position
* @param {string} posUnit - the position units
* @param {Window} win - the associated Window
* @returns {number[]} the position in norm units
*/
export function to_norm(pos, posUnit, win)
{
const response = { origin: 'util.to_norm', context: 'when converting a position to norm units' };
if (posUnit === 'norm')
return pos;
if (posUnit === 'pix')
return [pos[0] / (win.size[0]/2.0), pos[1] / (win.size[1]/2.0)];
if (posUnit === 'height') {
const minSize = Math.min(win.size[0], win.size[1]);
return [pos[0] * minSize / (win.size[0]/2.0), pos[1] * minSize / (win.size[1]/2.0)];
}
throw Object.assign(response, { error: `unknown position units: ${posUnit}` });
}
/**
* Convert the position to height units.
*
* @name module:util.to_height
* @function
* @public
* @param {number[]} pos - the input position
* @param {string} posUnit - the position units
* @param {Window} win - the associated Window
* @returns {number[]} the position in height units
*/
export function to_height(pos, posUnit, win)
{
const response = { origin: 'util.to_height', context: 'when converting a position to height units' };
if (posUnit === 'height')
return pos;
if (posUnit === 'pix') {
const minSize = Math.min(win.size[0], win.size[1]);
return [pos[0] / minSize, pos[1] / minSize];
}
if (posUnit === 'norm') {
const minSize = Math.min(win.size[0], win.size[1]);
return [pos[0] * win.size[0]/2.0 / minSize, pos[1] * win.size[1]/2.0 / minSize];
}
throw Object.assign(response, { error: `unknown position units: ${posUnit}` });
}
/**
* Convert the position to window units.
*
* @name module:util.to_win
* @function
* @public
* @param {number[]} pos - the input position
* @param {string} posUnit - the position units
* @param {Window} win - the associated Window
* @returns {number[]} the position in window units
*/
export function to_win(pos, posUnit, win)
{
const response = { origin: 'util.to_win', context: 'when converting a position to window units' };
try {
if (win._units === 'pix')
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: ${targetUnit}`;
} catch (error) {
throw Object.assign(response, { error });
}
}
/**
* Convert a position to a PIXI Point.
*
* @name module:util.to_pixiPoint
* @function
* @public
* @param {number[]} pos - the input position
* @param {string} posUnit - the position units
* @param {Window} win - the associated Window
* @returns {number[]} the position as a PIXI Point
*/
export function to_pixiPoint(pos, posUnit, win)
{
const pos_px = to_px(pos, posUnit, win);
return new PIXI.Point(pos_px[0], pos_px[1]);
}
/**
* Convert an object to its string representation, taking care of symbols.
*
* <p>Note: if the object is not already a string, we JSON stringify it and detect circularity.</p>
*
* @name module:util.toString
* @function
* @public
* @param {Object} object - the input object
* @return {string} a string representation of the object or 'Object (circular)'
*/
export function toString(object)
{
if (typeof object === 'undefined')
return 'undefined';
if (!object)
return 'null';
if (typeof object === 'string')
return object;
// if the object is a class and has a toString method:
if (object.constructor.toString().substring(0, 5) === 'class' && typeof object.toString === 'function')
return object.toString();
try {
const symbolReplacer = (key, value) => {
if (typeof value === 'symbol')
value = Symbol.keyFor(value);
return value;
};
return JSON.stringify(object, symbolReplacer);
} catch (e)
{
return 'Object (circular)';
}
}
if (!String.prototype.format)
{
String.prototype.format = function()
{
var args = arguments;
return this
.replace(/{(\d+)}/g, function(match, number)
{
return typeof args[number] != 'undefined' ? args[number] : match;
})
.replace(/{([$_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( (key, value) =>
{
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.
*
* @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 {
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);
}
}