@fto-consult/common/src/utils/formatNumber.js

Un ensemble de bibliothèques et d'utilistaires communs pour le développement d'applications javascript

// Copyright 2022 @fto-consult/Boris Fouomene. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
import defaultStr from "./defaultStr";

export const numberFormats = {  
    '# ###': { fractionSep: '', groupSep: ' ', precision: 0 },
    '# ###.#': { fractionSep: '.', groupSep: ' ', precision: 1 },
    '# ###.##': { fractionSep: '.', groupSep: ' ', precision: 2 },
    '# ###.###': { fractionSep: '.', groupSep: ' ', precision: 3 }, 

    '# ###,#': { fractionSep: ',', groupSep: ' ', precision: 1 },
    '# ###,##': { fractionSep: ',', groupSep: ' ', precision: 2 },
    '# ###,###': { fractionSep: ',', groupSep: ' ', precision: 3 },

    "#'###": { fractionSep: '', groupSep: "'", precision: 0 },
    "#'###.#": { fractionSep: '', groupSep: "'", precision: 1 },
    "#'###.##": { fractionSep: '.', groupSep: "'", precision: 2 },
    "#'###.###": { fractionSep: '.', groupSep: "'", precision: 3 },

    '#, ###': { fractionSep: '', groupSep: ', ', precision: 0 },
    '#, ###.#': { fractionSep: '.', groupSep: ', ', precision: 1 },
    '#, ###.##': { fractionSep: '.', groupSep: ', ', precision: 2 },
    '#, ###.###': { fractionSep: '.', groupSep: ', ', precision: 3 },

    '#,###': { fractionSep: '', groupSep: ',', precision: 0 },
    '#,###.#': { fractionSep: '.', groupSep: ',', precision: 1 },
    '#,###.##': { fractionSep: '.', groupSep: ',', precision: 2 },
    '#,###.###': { fractionSep: '.', groupSep: ',', precision: 3 },

    '#.###': { fractionSep: '', groupSep: '.', precision: 0 },
    '#.###,#': { fractionSep: ',', groupSep: '.', precision: 1 },
    '#.###,##': { fractionSep: ',', groupSep: '.', precision: 2 },
    '#.###,###': { fractionSep: ',', groupSep: '.', precision: 3 },

    '#,##,###.##': { fractionSep: '.', groupSep: ',', precision: 2 },
    '#,###.###': { fractionSep: '.', groupSep: ',', precision: 3 },
    '#.###': { fractionSep: '', groupSep: '.', precision: 0 },
    '#,###': { fractionSep: '', groupSep: ',', precision: 0 },
  };
  
export default {
    // parse a formatted number string
    // from "4 555 000.34" -> 4 555 000.34
    parseNumber(number, format = '# ###.##') {
      if (!number) {
        return 0;
      }
      if (typeof number === 'number') {
        return number;
      }
      const info = defaultStr(this.getFormatInfo(format));
      return parseDecimal(this.removeSeparator(number, info.groupSep));
    },
  
    formatNumber(number, format = '# ###.##', precision = null) {
      if (!number) {
        number = 0;
      }
      let info = Object.assign({},this.getFormatInfo(format));
      if (typeof(precision) =="number") {
        info.precision = precision;
      }
      let is_negative = false;
  
      number = this.parseNumber(number);
      if (number < 0) {
        is_negative = true;
      }
      number = Math.abs(number);
      number = number.toFixed(info.precision);
  
      var parts = number.split('.');
  
      // get group position and parts
      var group_position = info.groupSep ? 3 : 0;
  
      if (group_position) {
        var integer = parts[0];
        var str = '';
  
        for (var i = integer.length; i >= 0; i--) {
          var l = this.removeSeparator(str, info.groupSep).length;
          if (format == '#,##,###.##' && str.indexOf(',') != -1) {
            // INR
            group_position = 2;
            l += 1;
          }
  
          str += integer.charAt(i);
  
          if (l && !((l + 1) % group_position) && i != 0) {
            str += info.groupSep;
          }
        }
        parts[0] = str
          .split('')
          .reverse()
          .join('');
      }
      if (parts[0] + '' == '') {
        parts[0] = '0';
      }
  
      // join decimal
      parts[1] = parts[1] && info.fractionSep ? info.fractionSep + parts[1] : '';
  
      // join
      return (is_negative ? '-' : '') + parts[0] + parts[1];
    },
  
    getFormatInfo(format) {
      let format_info = numberFormats[format];
  
      if (!format_info) {
        throw new Error(`Unknown number format "${format}"`);
      }
  
      return format_info;
    },
  
    round(num, precision) {
      var is_negative = num < 0 ? true : false;
      var d = parseInt(precision || 0);
      var m = Math.pow(10, d);
      var n = +(d ? Math.abs(num) * m : Math.abs(num)).toFixed(8); // Avoid rounding errors
      var i = Math.floor(n),
        f = n - i;
      var r = !precision && f == 0.5 ? (i % 2 == 0 ? i : i + 1) : Math.round(n);
      r = d ? r / m : r;
      return is_negative ? -r : r;
    },
  
    removeSeparator(text, sep) {
      return text.replace(new RegExp(sep === '.' ? '\\.' : sep, 'g'), '');
    },
    formats : numberFormats,
    numberFormats
  };