@tetcoin/util/bn/toHex.js

A collection of useful utilities for @tetcoin

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = bnToHex;

var _objectSpread2 = _interopRequireDefault(require("@babel/runtime/helpers/objectSpread"));

var _number = _interopRequireDefault(require("../is/number"));

var _toU8a = _interopRequireDefault(require("./toU8a"));

var _u8a = require("../u8a");

// Copyright 2017-2019 @polkadot/util authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.
const ZERO_STR = '0x00';

/**
 * @name bnToHex
 * @summary Creates a hex value from a BN.js bignumber object.
 * @description
 * `null` inputs returns a `0x` result, BN values return the actual value as a `0x` prefixed hex value. Anything that is not a BN object throws an error. With `bitLength` set, it fixes the number to the specified length.
 * @example
 * <BR>
 *
 * ```javascript
 * import BN from 'bn.js';
 * import { bnToHex } from '@tetcoin/util';
 *
 * bnToHex(new BN(0x123456)); // => '0x123456'
 * ```
 */
function bnToHex(value) {
  let options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
    bitLength: -1,
    isLe: false,
    isNegative: false
  };

  if (!value) {
    return ZERO_STR;
  }

  const _options = (0, _objectSpread2.default)({
    isLe: false,
    isNegative: false
  }, (0, _number.default)(options) ? {
    bitLength: options
  } : options);

  return (0, _u8a.u8aToHex)((0, _toU8a.default)(value, _options));
}