@0x/web3-wrapper/lib/src/utils.js

Wraps around web3 and gives a nicer interface

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.utils = void 0;
const utils_1 = require("@0x/utils");
const _ = require("lodash");
exports.utils = {
    convertHexToNumber(value) {
        const valueBigNumber = new utils_1.BigNumber(value);
        const valueNumber = valueBigNumber.toNumber();
        return valueNumber;
    },
    convertHexToNumberOrNull(hex) {
        if (hex === null) {
            return null;
        }
        const decimal = exports.utils.convertHexToNumber(hex);
        return decimal;
    },
    convertAmountToBigNumber(value) {
        const num = value || 0;
        const isBigNumber = utils_1.BigNumber.isBigNumber(num);
        if (isBigNumber) {
            return num;
        }
        if (_.isString(num) && (num.indexOf('0x') === 0 || num.indexOf('-0x') === 0)) {
            return new utils_1.BigNumber(num.replace('0x', ''), 16);
        }
        const baseTen = 10;
        return new utils_1.BigNumber(num.toString(baseTen), baseTen);
    },
    encodeAmountAsHexString(value) {
        const valueBigNumber = exports.utils.convertAmountToBigNumber(value);
        const hexBase = 16;
        const valueHex = valueBigNumber.toString(hexBase);
        return valueBigNumber.isLessThan(0) ? `-0x${valueHex.substr(1)}` : `0x${valueHex}`;
    },
    numberToHex(value) {
        if (!isFinite(value) && !exports.utils.isHexStrict(value)) {
            throw new Error(`Given input ${value} is not a number.`);
        }
        const valueBigNumber = new utils_1.BigNumber(value);
        const hexBase = 16;
        const result = valueBigNumber.toString(hexBase);
        return valueBigNumber.lt(0) ? `-0x${result.substr(1)}` : `0x${result}`;
    },
    isHexStrict(hex) {
        return ((_.isString(hex) || _.isNumber(hex)) && /^(-)?0x[0-9a-f]*$/i.test(_.isNumber(hex) ? hex.toString() : hex));
    },
};
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