mapcomplete/Utils.ts

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import {UIElement} from "./UI/UIElement";
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export class Utils {
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static EncodeXmlValue(str) {
return str.replace(/&/g, '&')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/"/g, '&quot;')
.replace(/'/g, '&apos;')
}
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/**
* Gives a clean float, or undefined if parsing fails
* @param str
*/
static asFloat(str): number {
if (str) {
const i = parseFloat(str);
if (isNaN(i)) {
return undefined;
}
return i;
}
return undefined;
}
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public static Upper(str: string) {
return str.substr(0, 1).toUpperCase() + str.substr(1);
}
public static Times(str: string, count: number): string {
let res = "";
for (let i = 0; i < count; i++) {
res += str;
}
return res;
}
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static DoEvery(millis: number, f: (() => void)) {
if (UIElement.runningFromConsole) {
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return;
}
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window.setTimeout(
function () {
f();
Utils.DoEvery(millis, f);
}
, millis)
}
public static NoNull<T>(array: T[]): T[] {
const ls: T[] = [];
for (const t of array) {
if (t === undefined || t === null) {
continue;
}
ls.push(t);
}
return ls;
}
public static NoEmpty(array: string[]): string[]{
const ls: string[] = [];
for (const t of array) {
if (t === "") {
continue;
}
ls.push(t);
}
return ls;
}
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public static EllipsesAfter(str : string, l : number = 100){
if(str === undefined){
return undefined;
}
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if(str.length <= l){
return str;
}
return str.substr(0, l - 3)+"...";
}
public static Dedup(arr: string[]):string[]{
if(arr === undefined){
return undefined;
}
const newArr = [];
for (const string of arr) {
if(newArr.indexOf(string) < 0){
newArr.push(string);
}
}
return newArr;
}
public static MergeTags(a :any, b: any){
const t = {};
for (const k in a) {
t[k] = a[k];
}
for (const k in b) {
t[k] = b[k];
}
return t;
}
public static SplitFirst(a: string, sep: string):string[]{
const index = a.indexOf(sep);
if(index < 0){
return [a];
}
return [a.substr(0, index), a.substr(index+sep.length)];
}
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public static isRetina() : boolean{
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if(UIElement.runningFromConsole){
return;
}
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// The cause for this line of code: https://github.com/pietervdvn/MapComplete/issues/115
// See https://stackoverflow.com/questions/19689715/what-is-the-best-way-to-detect-retina-support-on-a-device-using-javascript
return ((window.matchMedia && (window.matchMedia('only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx), only screen and (min-resolution: 75.6dpcm)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (min--moz-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2)').matches)) || (window.devicePixelRatio && window.devicePixelRatio >= 2));
}
}