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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 class Group {
constructor(key, id, parentTotal, entries, length = 0) {
this.key = key;
this.id = id;
this.entries = entries;
this.length = 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, 1);
groups.push(group);
keyToGroup.set(key, group);
}
// Sort by length
return groups.sort((a, b) => b.length - a.length);
}
export function arrayEquals(left, right, compareFn) {
if (left == right) return true;
if (left.length != right.length) return false;
if (compareFn === undefined) {
for (let i = 0; i < left.length; i++) {
if (left[i] != right[i]) return false;
}
} else {
for (let i = 0; i < left.length; i++) {
if (!compareFn(left[i], right[i])) return false;
}
}
return true;
}
export function entriesEquals(left, right) {
if (left == right) return true;
if (left == undefined) return right == undefined;
const leftEntries = Object.entries(left);
const rightEntries = Object.entries(right);
if (leftEntries.length !== rightEntries.length) return false;
for (let i = 0; i < leftEntries.length; i++) {
const l = leftEntries[i];
const r = rightEntries[i];
if (l[0] != r[0]) return false;
if (l[1] != r[1]) return false;
}
return true;
}
export function keysEquals(left, right) {
if (left == right) return true;
if (left == undefined) return right == undefined;
return arrayEquals(Object.keys(left), Object.keys(right));
}
export * from '../js/helper.mjs'
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