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