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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
export const KB = 1024;
export const MB = KB * KB;
export const GB = MB * KB;
export const kMicro2Milli = 1 / 1000;
export function formatBytes(bytes) {
const units = ['B', 'KiB', 'MiB', 'GiB'];
const divisor = 1024;
let index = 0;
while (index < units.length && bytes >= divisor) {
index++;
bytes /= divisor;
}
return bytes.toFixed(2) + units[index];
}
export function formatMicroSeconds(micro) {
return (micro * kMicro2Milli).toFixed(1) + 'ms';
}
export function formatDurationMicros(micros, secondsDigits = 3) {
return formatDurationMillis(micros * kMicro2Milli, secondsDigits);
}
export function formatDurationMillis(millis, secondsDigits = 3) {
if (millis < 1000) {
if (millis < 1) {
return (millis / kMicro2Milli).toFixed(1) + 'ns';
}
return millis.toFixed(2) + 'ms';
}
let seconds = millis / 1000;
const hours = Math.floor(seconds / 3600);
const minutes = Math.floor((seconds % 3600) / 60);
seconds = seconds % 60;
let buffer = ''
if (hours > 0) buffer += hours + 'h ';
if (hours > 0 || minutes > 0) buffer += minutes + 'm ';
buffer += seconds.toFixed(secondsDigits) + 's'
return buffer;
}
export function delay(time) {
return new Promise(resolver => setTimeout(resolver, time));
}
export function defer() {
let resolve_func, reject_func;
const p = new Promise((resolve, reject) => {
resolve_func = resolve;
reject_func = resolve;
});
p.resolve = resolve_func;
p.reject = reject_func;
return p;
}
export class Group {
constructor(key, id, parentTotal, entries) {
this.key = key;
this.id = id;
this.entries = entries;
this.length = entries.length;
this.parentTotal = parentTotal;
}
get percent() {
return this.length / this.parentTotal * 100;
}
add() {
this.length++;
}
addEntry(entry) {
this.length++;
this.entries.push(entry);
}
}
export function groupBy(array, keyFunction, collect = false) {
if (array.length === 0) return [];
if (keyFunction === undefined) keyFunction = each => each;
const keyToGroup = new Map();
const groups = [];
const sharedEmptyArray = [];
let id = 0;
// This is performance critical, resorting to for-loop
for (let each of array) {
const key = keyFunction(each);
let group = keyToGroup.get(key);
if (group !== undefined) {
collect ? group.addEntry(each) : group.add();
continue;
}
let entries = collect ? [each] : sharedEmptyArray;
group = new Group(key, id++, array.length, entries);
groups.push(group);
keyToGroup.set(key, group);
}
// Sort by length
return groups.sort((a, b) => b.length - a.length);
}
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