Recursive Parse (BigNumber example)

recursive-parse.ts

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

let test = {
  initialState: {
    amount: {
      _hex: "0x4563918244f40000",
    },
    assetId: "0xeec918d74c746167564401103096D45BbD494B74",
    coinTransfers: [
      {
        amount: {
          _hex: "0x4563918244f40000",
        },
        to: "0xf80D16ea04D24bf0A2a45d5101E62BE5681240ff",
      },
      {
        amount: {
          _hex: "0x00",
        },
        to: "0xF80fd6F5eF91230805508bB28d75248024E50F6F",
      },
    ],
    linkedHash: "0x8edf857e1cfa97682d7ef0277a98b159c899da66b75955435df9b3e4289d0b76",
    paymentId: "0x9f915492bb490ec3096b5616e65fd0ea287fe76993335f5e32698777fa6873bc",
    preImage: "0x0000000000000000000000000000000000000000000000000000000000000000",
  },
};


function recursiveParse(evalObj: any, isCondition: any, parse: any) {
  const result = evalObj;

  function crawlAndParse(
    evalObj: any,
    isCondition: any,
    parse: any,
    prevObj?: any,
    prevKey?: string,
  ) {
    if (!isCondition(evalObj, prevObj, prevKey) && typeof evalObj === "object") {
      Object.keys(evalObj).map(key =>
        crawlAndParse(evalObj[key], isCondition, parse, evalObj, key),
      );
    } else {
      if (isCondition(evalObj, prevObj, prevKey)) {
        prevObj[prevKey] = parse(prevObj[prevKey]);
      }
    }
  }

  crawlAndParse(result, isCondition, parse);

  return result;
}


function isCondition(evalObj: any, prevObj?: any, prevKey?: string) {
  if (typeof evalObj === "object") {
    const keys = Object.keys(evalObj);
    if (keys.length === 1 && keys[0] === "_hex") {
      return true;
    }
  }
  return false;
}

function parse(evalObj: any) {
  return new BigNumber(evalObj._hex);
}


let result = recursiveParse(test, isCondition, parse);

console.log(result)
// {
//   initialState: {
//     amount: [BigNumber],
//     assetId: "0xeec918d74c746167564401103096D45BbD494B74",
//     coinTransfers: [
//       {
//         amount: [BigNumber],
//         to: "0xf80D16ea04D24bf0A2a45d5101E62BE5681240ff",
//       },
//       {
//         amount: [BigNumber],
//         to: "0xF80fd6F5eF91230805508bB28d75248024E50F6F",
//       },
//     ],
//     linkedHash: "0x8edf857e1cfa97682d7ef0277a98b159c899da66b75955435df9b3e4289d0b76",
//     paymentId: "0x9f915492bb490ec3096b5616e65fd0ea287fe76993335f5e32698777fa6873bc",
//     preImage: "0x0000000000000000000000000000000000000000000000000000000000000000",
//   },
// };