Unexpected Token Function

[rzeydelis]

I am trying to run JS2PY and am returning this error:

/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/es6/__init__.py:10: UserWarning: 
Importing babel.py for the first time - this can take some time. 
Please note that currently Javascript 6 in Js2Py is unstable and slow. Use only for tiny scripts!
  warnings.warn(
/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/base.py:2854: FutureWarning: Possible nested set at position 5
  self.pat = re.compile(
Initialised babel!
Traceback (most recent call last):
  File "/home/bobby/uni_balances/main.py", line 104, in <module>
    result = js2py.eval_js6(js)  # executing JavaScript and converting the result to python string 
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/evaljs.py", line 120, in eval_js6
    return eval_js(js6_to_js5(js))
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/evaljs.py", line 115, in eval_js
    return e.eval(js)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/evaljs.py", line 204, in eval
    self.execute(code, use_compilation_plan=use_compilation_plan)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/evaljs.py", line 199, in execute
    exec (compiled, self._context)
  File "<EvalJS snippet>", line 4, in <module>
  File "<EvalJS snippet>", line 3, in PyJs_LONG_0_
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/base.py", line 949, in __call__
    return self.call(self.GlobalObject, args)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/base.py", line 1464, in call
    return Js(self.code(*args))
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/host/jseval.py", line 17, in Eval
    py_code = translate_js(code.to_string().value, '')
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/translators/translator.py", line 70, in translate_js
    parsed = parse_fn(js)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/js2py/translators/translator.py", line 62, in pyjsparser_parse_fn
    return parser.parse(code)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 3008, in parse
    program = self.parseProgram()
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 2974, in parseProgram
    body = self.parseScriptBody()
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 2963, in parseScriptBody
    statement = self.parseStatementListItem()
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 2110, in parseStatementListItem
    return self.parseStatement()
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 2718, in parseStatement
    self.consumeSemicolon()
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 1120, in consumeSemicolon
    self.throwUnexpectedToken(self.lookahead)
  File "/home/bobby/uni_balances/uni_venv/lib/python3.10/site-packages/pyjsparser/parser.py", line 1046, in throwUnexpectedToken
    raise self.unexpectedTokenError(token, message)
js2py.internals.simplex.JsException: SyntaxError: Line 34: Unexpected token function

This is my JS code:

import { JSBI } from "@uniswap/sdk";
import { ethers } from 'ethers';
import * as fs from 'fs';


function myFunction(id){
    // ERC20 json abi file

let ERC20Abi = fs.readFileSync('Erc20.json');
const ERC20 = JSON.parse(ERC20Abi);

    // V3 pool abi json file
let pool = fs.readFileSync('V3PairAbi.json');
const IUniswapV3PoolABI = JSON.parse(pool);

    // V3 factory abi json
let facto = fs.readFileSync('V3factory.json');
const IUniswapV3FactoryABI = JSON.parse(facto);

let NFT = fs.readFileSync('UniV3NFT.json');
const IUniswapV3NFTmanagerABI = JSON.parse(NFT);

const provider = new ethers.providers.JsonRpcProvider(ALCHEMY_API_ID)

    // V3 standard addresses (different for celo)
const factory = "0x1F98431c8aD98523631AE4a59f267346ea31F984";
const NFTmanager = "0xC36442b4a4522E871399CD717aBDD847Ab11FE88";

async function getData(tokenID){
    let FactoryContract = new ethers.Contract(factory, IUniswapV3FactoryABI, provider);

    let NFTContract =  new ethers.Contract(NFTmanager, IUniswapV3NFTmanagerABI, provider);
    let position = await NFTContract.positions(tokenID);
    
    let token0contract =  new ethers.Contract(position.token0, ERC20, provider);
    let token1contract =  new ethers.Contract(position.token1, ERC20, provider);
    let token0Decimal = await token0contract.decimals();
    let token1Decimal = await token1contract.decimals();
    
    let token0sym = await token0contract.symbol();
    let token1sym = await token1contract.symbol();
    
    let V3pool = await FactoryContract.getPool(position.token0, position.token1, position.fee);
    let poolContract = new ethers.Contract(V3pool, IUniswapV3PoolABI, provider);

    let slot0 = await poolContract.slot0();

    
    let pairName = token0sym +"/"+ token1sym;
    
    let dict = {"SqrtX96" : slot0.sqrtPriceX96.toString(), "Pair": pairName, "T0d": token0Decimal, "T1d": token1Decimal, "tickLow": position.tickLower, "tickHigh": position.tickUpper, "liquidity": position.liquidity.toString()}

    return dict
}


const Q96 = JSBI.exponentiate(JSBI.BigInt(2), JSBI.BigInt(96));
const MIN_TICK = -887272;
const MAX_TICK = 887272;

function getTickAtSqrtRatio(sqrtPriceX96){
    let tick = Math.floor(Math.log((sqrtPriceX96/Q96)**2)/Math.log(1.0001));
    return tick;
}

async function getTokenAmounts(liquidity,sqrtPriceX96,tickLow,tickHigh,token0Decimal,token1Decimal){
    let sqrtRatioA = Math.sqrt(1.0001**tickLow).toFixed(18);
    let sqrtRatioB = Math.sqrt(1.0001**tickHigh).toFixed(18);
    let currentTick = getTickAtSqrtRatio(sqrtPriceX96);
    let sqrtPrice = sqrtPriceX96 / Q96;
    let amount0wei = 0;
    let amount1wei = 0;
    if(currentTick <= tickLow){
        amount0wei = Math.floor(liquidity*((sqrtRatioB-sqrtRatioA)/(sqrtRatioA*sqrtRatioB)));
    }
    if(currentTick > tickHigh){
        amount1wei = Math.floor(liquidity*(sqrtRatioB-sqrtRatioA));
    }
    if(currentTick >= tickLow && currentTick < tickHigh){ 
        amount0wei = Math.floor(liquidity*((sqrtRatioB-sqrtPrice)/(sqrtPrice*sqrtRatioB)));
        amount1wei = Math.floor(liquidity*(sqrtPrice-sqrtRatioA));
    }
    
    let amount0Human = (amount0wei/(10**token0Decimal)).toFixed(token0Decimal);
    let amount1Human = (amount1wei/(10**token1Decimal)).toFixed(token1Decimal);

    console.log("Amount Token0 wei: "+amount0wei);
    console.log("Amount Token1 wei: "+amount1wei);
    console.log("Amount Token0 : "+amount0Human);
    console.log("Amount Token1 : "+amount1Human);
    return [amount0wei, amount1wei]
}

async function start(positionID){
    let data = await getData(positionID);
    let tokens = await getTokenAmounts(data.liquidity, data.SqrtX96, data.tickLow, data.tickHigh, data.T0d, data.T1d);
}

start(POOL_ID)
// Also it can be used without the position data if you pull the data it will work for any range
getTokenAmounts(12558033400096537032, 20259533801624375790673555415)
}

let x = 

This is my python code:

import js2py

js = """
import { JSBI } from "@uniswap/sdk";
import { ethers } from 'ethers';
import * as fs from 'fs';

    // ERC20 json abi file
let ERC20Abi = fs.readFileSync('Erc20.json');
const ERC20 = JSON.parse(ERC20Abi);

    // V3 pool abi json file
let pool = fs.readFileSync('V3PairAbi.json');
const IUniswapV3PoolABI = JSON.parse(pool);

    // V3 factory abi json
let facto = fs.readFileSync('V3factory.json');
const IUniswapV3FactoryABI = JSON.parse(facto);

let NFT = fs.readFileSync('UniV3NFT.json');
const IUniswapV3NFTmanagerABI = JSON.parse(NFT);

const provider = new ethers.providers.JsonRpcProvider("https://eth-mainnet.g.alchemy.com/v2/fRrLGBzCur7V6wCQjGRPdtmTUQzjCk2F")

    // V3 standard addresses (different for celo)
const factory = "0x1F98431c8aD98523631AE4a59f267346ea31F984";
const NFTmanager = "0xC36442b4a4522E871399CD717aBDD847Ab11FE88";

async function getData(tokenID){
    let FactoryContract = new ethers.Contract(factory, IUniswapV3FactoryABI, provider);

    let NFTContract =  new ethers.Contract(NFTmanager, IUniswapV3NFTmanagerABI, provider);
    let position = await NFTContract.positions(tokenID);
    
    let token0contract =  new ethers.Contract(position.token0, ERC20, provider);
    let token1contract =  new ethers.Contract(position.token1, ERC20, provider);
    let token0Decimal = await token0contract.decimals();
    let token1Decimal = await token1contract.decimals();
    
    let token0sym = await token0contract.symbol();
    let token1sym = await token1contract.symbol();
    
    let V3pool = await FactoryContract.getPool(position.token0, position.token1, position.fee);
    let poolContract = new ethers.Contract(V3pool, IUniswapV3PoolABI, provider);

    let slot0 = await poolContract.slot0();

    
    let pairName = token0sym +"/"+ token1sym;
    
    let dict = {"SqrtX96" : slot0.sqrtPriceX96.toString(), "Pair": pairName, "T0d": token0Decimal, "T1d": token1Decimal, "tickLow": position.tickLower, "tickHigh": position.tickUpper, "liquidity": position.liquidity.toString()}

    return dict
}


const Q96 = JSBI.exponentiate(JSBI.BigInt(2), JSBI.BigInt(96));
const MIN_TICK = -887272;
const MAX_TICK = 887272;

function getTickAtSqrtRatio(sqrtPriceX96){
    let tick = Math.floor(Math.log((sqrtPriceX96/Q96)**2)/Math.log(1.0001));
    return tick;
}

async function getTokenAmounts(liquidity,sqrtPriceX96,tickLow,tickHigh,token0Decimal,token1Decimal){
    let sqrtRatioA = Math.sqrt(1.0001**tickLow).toFixed(18);
    let sqrtRatioB = Math.sqrt(1.0001**tickHigh).toFixed(18);
    let currentTick = getTickAtSqrtRatio(sqrtPriceX96);
    let sqrtPrice = sqrtPriceX96 / Q96;
    let amount0wei = 0;
    let amount1wei = 0;
    if(currentTick <= tickLow){
        amount0wei = Math.floor(liquidity*((sqrtRatioB-sqrtRatioA)/(sqrtRatioA*sqrtRatioB)));
    }
    if(currentTick > tickHigh){
        amount1wei = Math.floor(liquidity*(sqrtRatioB-sqrtRatioA));
    }
    if(currentTick >= tickLow && currentTick < tickHigh){ 
        amount0wei = Math.floor(liquidity*((sqrtRatioB-sqrtPrice)/(sqrtPrice*sqrtRatioB)));
        amount1wei = Math.floor(liquidity*(sqrtPrice-sqrtRatioA));
    }
    
    let amount0Human = (amount0wei/(10**token0Decimal)).toFixed(token0Decimal);
    let amount1Human = (amount1wei/(10**token1Decimal)).toFixed(token1Decimal);

    console.log("Amount Token0 wei: "+amount0wei);
    console.log("Amount Token1 wei: "+amount1wei);
    console.log("Amount Token0 : "+amount0Human);
    console.log("Amount Token1 : "+amount1Human);
    return [amount0wei, amount1wei]
}

async function start(positionID){
    let data = await getData(positionID);
    let tokens = await getTokenAmounts(data.liquidity, data.SqrtX96, data.tickLow, data.tickHigh, data.T0d, data.T1d);
}

start(273381)
// Also it can be used without the position data if you pull the data it will work for any range
getTokenAmounts(12558033400096537032, 20259533801624375790673555415)
""".replace("document.write", "return ")

result = js2py.eval_js6(js)  # executing JavaScript and converting the result to python string 

Any idea what this unexpected token error is?

[PiotrDabkowski]

The async keyword that is not support by ECMAScript6, it is ECMAScript7.

Remember that js2py does not implement the whole node builtin library/environment (not part of ECMA5) like: fs so this will not work unless you define it yourself. In would suggest in this case to use node js.