web3x/utils/number-to-bn.js

Typescript port of web3.js

"use strict";
/*
  This file is part of web3x.

  web3x is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  web3x 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 Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with web3x.  If not, see <http://www.gnu.org/licenses/>.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const bn_js_1 = tslib_1.__importDefault(require("bn.js"));
function stripHexPrefix(str) {
    return str.replace('0x', '');
}
function numberToBN(arg) {
    if (typeof arg === 'string' || typeof arg === 'number') {
        let multiplier = new bn_js_1.default(1); // eslint-disable-line
        const formattedString = String(arg)
            .toLowerCase()
            .trim();
        const isHexPrefixed = formattedString.substr(0, 2) === '0x' || formattedString.substr(0, 3) === '-0x';
        let stringArg = stripHexPrefix(formattedString); // eslint-disable-line
        if (stringArg.substr(0, 1) === '-') {
            stringArg = stripHexPrefix(stringArg.slice(1));
            multiplier = new bn_js_1.default(-1, 10);
        }
        stringArg = stringArg === '' ? '0' : stringArg;
        if ((!stringArg.match(/^-?[0-9]+$/) && stringArg.match(/^[0-9A-Fa-f]+$/)) ||
            stringArg.match(/^[a-fA-F]+$/) ||
            (isHexPrefixed === true && stringArg.match(/^[0-9A-Fa-f]+$/))) {
            return new bn_js_1.default(stringArg, 16).mul(multiplier);
        }
        if ((stringArg.match(/^-?[0-9]+$/) || stringArg === '') && isHexPrefixed === false) {
            return new bn_js_1.default(stringArg, 10).mul(multiplier);
        }
    }
    else if (typeof arg === 'object' && arg.toString && (!arg.pop && !arg.push)) {
        if (arg.toString(10).match(/^-?[0-9]+$/) && (arg.mul || arg.dividedToIntegerBy)) {
            return new bn_js_1.default(arg.toString(10), 10);
        }
    }
    throw new Error('[number-to-bn] while converting number ' +
        JSON.stringify(arg) +
        ' to BN.js instance, error: invalid number value. Value must be an integer, hex string, BN or BigNumber instance. Note, decimals are not supported.');
}
exports.numberToBN = numberToBN;
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