client/src/app/shared/shared-main/angular/bytes.pipe.ts

   1 import { Pipe, PipeTransform } from '@angular/core'
   2
   3 // Thanks: https://github.com/danrevah/ngx-pipes/blob/master/src/ng-pipes/pipes/math/bytes.ts
   4
   5 @Pipe({ name: 'bytes' })
   6 export class BytesPipe implements PipeTransform {
   7   private dictionary: Array<{ max: number; type: string }> = [
   8     { max: 1024, type: 'B' },
   9     { max: 1048576, type: 'KB' },
  10     { max: 1073741824, type: 'MB' },
  11     { max: 1.0995116e12, type: 'GB' }
  12   ]
  13
  14   transform (value: number, precision?: number | undefined): string | number {
  15     const format = this.dictionary.find(d => value < d.max) || this.dictionary[this.dictionary.length - 1]
  16     const calc = value / (format.max / 1024)
  17
  18     const num = precision === undefined
  19       ? calc
  20       : applyPrecision(calc, precision)
  21
  22     return `${num} ${format.type}`
  23   }
  24 }
  25
  26 function applyPrecision (num: number, precision: number) {
  27   if (precision <= 0) {
  28     return Math.round(num)
  29   }
  30
  31   const tho = 10 ** precision
  32
  33   return Math.round(num * tho) / tho
  34 }