@aplus-frontend/antdv/es/input-number/src/utils/numberUtil.js

Vue basic component library maintained based on ant-design-vue

import { supportBigInt } from './supportUtil';
/**
 * Format string number to readable number
 */
export function trimNumber(numStr) {
  let str = numStr.trim();
  let negative = str.startsWith('-');
  if (negative) {
    str = str.slice(1);
  }
  str = str
  // Remove decimal 0. `1.000` => `1.`, `1.100` => `1.1`
  .replace(/(\.\d*[^0])0*$/, '$1')
  // Remove useless decimal. `1.` => `1`
  .replace(/\.0*$/, '')
  // Remove integer 0. `0001` => `1`, 000.1' => `.1`
  .replace(/^0+/, '');
  if (str.startsWith('.')) {
    str = `0${str}`;
  }
  const trimStr = str || '0';
  const splitNumber = trimStr.split('.');
  const integerStr = splitNumber[0] || '0';
  const decimalStr = splitNumber[1] || '0';
  if (integerStr === '0' && decimalStr === '0') {
    negative = false;
  }
  const negativeStr = negative ? '-' : '';
  return {
    negative,
    negativeStr,
    trimStr,
    integerStr,
    decimalStr,
    fullStr: `${negativeStr}${trimStr}`
  };
}
export function isE(number) {
  const str = String(number);
  return !Number.isNaN(Number(str)) && str.includes('e');
}
/**
 * [Legacy] Convert 1e-9 to 0.000000001.
 * This may lose some precision if user really want 1e-9.
 */
export function getNumberPrecision(number) {
  const numStr = String(number);
  if (isE(number)) {
    let precision = Number(numStr.slice(numStr.indexOf('e-') + 2));
    const decimalMatch = numStr.match(/\.(\d+)/);
    if (decimalMatch === null || decimalMatch === void 0 ? void 0 : decimalMatch[1]) {
      precision += decimalMatch[1].length;
    }
    return precision;
  }
  return numStr.includes('.') && validateNumber(numStr) ? numStr.length - numStr.indexOf('.') - 1 : 0;
}
/**
 * Convert number (includes scientific notation) to -xxx.yyy format
 */
export function num2str(number) {
  let numStr = String(number);
  if (isE(number)) {
    if (number > Number.MAX_SAFE_INTEGER) {
      return String(supportBigInt() ? BigInt(number).toString() : Number.MAX_SAFE_INTEGER);
    }
    if (number < Number.MIN_SAFE_INTEGER) {
      return String(supportBigInt() ? BigInt(number).toString() : Number.MIN_SAFE_INTEGER);
    }
    numStr = number.toFixed(getNumberPrecision(numStr));
  }
  return trimNumber(numStr).fullStr;
}
export function validateNumber(num) {
  if (typeof num === 'number') {
    return !Number.isNaN(num);
  }
  // Empty
  if (!num) {
    return false;
  }
  return (
    // Normal type: 11.28
    /^\s*-?\d+(\.\d+)?\s*$/.test(num) ||
    // Pre-number: 1.
    /^\s*-?\d+\.\s*$/.test(num) ||
    // Post-number: .1
    /^\s*-?\.\d+\s*$/.test(num)
  );
}