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export function mapFromObject<T>(obj: {[key: string]: T}): Map<string, T> {
const ret = new Map();
for (const k of Object.keys(obj))
ret.set(k, obj[k]);
return ret;
}
export function mapValues<K, V1, V2>(f: (v: V1) => V2, map: Map<K, V1>): Map<K, V2> {
const ret: Map<K, V2> = new Map();
for (const [k, v] of map)
ret.set(k, f(v));
return ret;
}
export async function mapValuesAsync<K, V1, V2>(f: (v: V1) => Promise<V2>, map: Map<K, V1>): Promise<Map<K, V2>> {
const ret: Map<K, V2> = new Map();
for (const [k, v] of mapValues(f, map))
ret.set(k, await v);
return ret;
}
export function nextPowerOf2(n: number): number {
let i = 1;
while (i < n)
i *= 2;
return i;
}
export class Listenable<T extends any[]> {
private readonly listeners: Array<(...args: T) => void> = [];
public addListener(listener: (...args: T) => void): void {
this.listeners.push(listener);
}
protected runListeners(...args: T): void {
this.listeners.forEach((l) => l(...args));
}
}
export function get(url: string): Promise<XMLHttpRequest> {
return new Promise((resolve, reject) => {
const xhr = new XMLHttpRequest();
const handleError = () => {
if (xhr.readyState !== xhr.DONE) {
reject(new Error('HTTP request ended in state ' + xhr.readyState));
return;
}
reject(new Error('HTTP request returned status ' + xhr.status));
};
xhr.addEventListener('error', handleError);
xhr.addEventListener('load', () => {
if (xhr.readyState !== xhr.DONE || xhr.status !== 200) {
handleError();
return;
}
resolve(xhr);
});
xhr.open('GET', url, true);
xhr.send();
});
}
export async function getJSON(url: string): Promise<any> {
return JSON.parse((await get(url)).responseText);
}
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