blob: e4acd91b2d01844e5f1a265e347a713b46236dbb [file] [log] [blame]
// Copyright (c) 2020 The Chromium 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 clamp = (num: number, min: number, max: number): number => {
let clampedNumber = num;
if (num < min) {
clampedNumber = min;
} else if (num > max) {
clampedNumber = max;
}
return clampedNumber;
};
export const mod = (m: number, n: number): number => {
return ((m % n) + n) % n;
};
export const bytesToString = (bytes: number): string => {
if (bytes < 1000) {
return `${bytes.toFixed(0)}\xA0B`;
}
const kilobytes = bytes / 1000;
if (kilobytes < 100) {
return `${kilobytes.toFixed(1)}\xA0kB`;
}
if (kilobytes < 1000) {
return `${kilobytes.toFixed(0)}\xA0kB`;
}
const megabytes = kilobytes / 1000;
if (megabytes < 100) {
return `${megabytes.toFixed(1)}\xA0MB`;
}
return `${megabytes.toFixed(0)}\xA0MB`;
};
export const toFixedIfFloating = (value: string): string => {
if (!value || Number.isNaN(Number(value))) {
return value;
}
const number = Number(value);
return number % 1 ? number.toFixed(3) : String(number);
};
/**
* Rounds a number (including float) down.
*/
export const floor = (value: number, precision: number = 0): number => {
const mult = Math.pow(10, precision);
return Math.floor(value * mult) / mult;
};
/**
* Computes the great common divisor for two numbers.
* If the numbers are floats, they will be rounded to an integer.
*/
export const greatestCommonDivisor = (a: number, b: number): number => {
a = Math.round(a);
b = Math.round(b);
while (b !== 0) {
const t = b;
b = a % b;
a = t;
}
return a;
};
const commonRatios = new Map([
['8∶5', '16∶10'],
]);
export const aspectRatio = (width: number, height: number): string => {
const divisor = greatestCommonDivisor(width, height);
if (divisor !== 0) {
width /= divisor;
height /= divisor;
}
const result = `${width}∶${height}`;
return commonRatios.get(result) || result;
};
export const withThousandsSeparator = function(num: number): string {
let str = String(num);
const re = /(\d+)(\d{3})/;
while (str.match(re)) {
str = str.replace(re, '$1\xA0$2');
} // \xa0 is a non-breaking space
return str;
};