Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import "./Counter.sol";

contract CounterFactory {
    event CounterCreated(address counterAddress, bytes32 salt, uint256 initialNumber);
    
    // Maps salt to deployed counter address
    mapping(bytes32 => address) public counters;
    
    // Create a new Counter with the provided salt and initial number
    function createCounter(bytes32 salt, uint256 initialNumber) external returns (address) {
        Counter counter = new Counter{salt: salt}(initialNumber);
        address counterAddress = address(counter);
        
        counters[salt] = counterAddress;
        emit CounterCreated(counterAddress, salt, initialNumber);
        
        return counterAddress;
    }
    
    // Get the address of a counter for a given salt
    function getCounterAddress(bytes32 salt) public view returns (address) {
        return counters[salt];
    }
    
    // Predict the address of a counter for a given salt
    function predictCounterAddress(bytes32 salt) public view returns (address) {
        bytes memory bytecode = abi.encodePacked(
            type(Counter).creationCode,
            abi.encode(uint256(0)) // Default initialNumber for prediction
        );
        
        return address(uint160(uint(keccak256(abi.encodePacked(
            bytes1(0xff),
            address(this),
            salt,
            keccak256(bytecode)
        )))));
    }
    
    // Predict the address of a counter for a given salt and initial number
    function predictCounterAddressWithInitialNumber(bytes32 salt, uint256 initialNumber) public view returns (address) {
        bytes memory bytecode = abi.encodePacked(
            type(Counter).creationCode,
            abi.encode(initialNumber)
        );
        
        return address(uint160(uint(keccak256(abi.encodePacked(
            bytes1(0xff),
            address(this),
            salt,
            keccak256(bytecode)
        )))));
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

contract Counter {
    uint256 public number;

    constructor(uint256 initialNumber) {
        number = initialNumber;
    }

    function setNumber(uint256 newNumber) public {
        number = newNumber;
    }

    function increment() public {
        number++;
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": false,
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"counterAddress","type":"address"},{"indexed":false,"internalType":"bytes32","name":"salt","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"initialNumber","type":"uint256"}],"name":"CounterCreated","type":"event"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"counters","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"uint256","name":"initialNumber","type":"uint256"}],"name":"createCounter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"}],"name":"getCounterAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"}],"name":"predictCounterAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"uint256","name":"initialNumber","type":"uint256"}],"name":"predictCounterAddressWithInitialNumber","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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