@parity/api/test/types.js

The Parity Promise-based API library for interfacing with Ethereum over RPC

// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

const BigNumber = require('bignumber.js');

const { isFunction, isInstanceOf } = require('../src/util/types');
const { isAddress } = require('../src/util/address');

const ZEROS = '000000000000000000000000000000000000000000000000000000000000';

function isBigNumber (test) {
  return isInstanceOf(test, BigNumber);
}

function isBoolean (test) {
  return Object.prototype.toString.call(test) === '[object Boolean]';
}

function isHexNumber (_test) {
  if (_test.substr(0, 2) !== '0x') {
    return false;
  }

  const test = _test.substr(2);
  const hex = `${ZEROS}${(new BigNumber(_test, 16)).toString(16)}`.slice(-1 * test.length);

  return hex === test;
}

module.exports = {
  isAddress,
  isBigNumber,
  isBoolean,
  isFunction,
  isHexNumber,
  isInstanceOf
};