tough-rational/lib/fallback/parse.js

Rational class using BigInt with fallback to bignumber.js

'use strict';

const { isRational } = require('../fixtures');
const BN = require('bignumber.js');
const bufferToHex = require('../util/buffer-to-hex');
const isBuffer = require('../util/is-buffer');

const coerceToParseable = (input) => {
  if (isBuffer(input)) return bufferToHex(input);
  if (isRational(input)) return input._getEncapsulatedRational ? input._getEncapsulatedRational() : new BN(String(input._getNumerator())).dividedBy(String(input._getDenominator()));
  switch (typeof input) {
    case 'string':
    case 'number':
      return input;
    case 'undefined':
      return 0;
    case 'object':
      if (input === null) return 0;
      return input;
    case 'symbol':
      return String(input);
    case 'bigint':
      return Number(input);
    case 'boolean':
      return input ? 1 : 0;
  }
  return input;
};

const parseDynamic = (input) => new BN(coerceToParseable(input));

Object.assign(module.exports, {
  coerceToParseable,
  parseDynamic
});