@pollum-io/pegasys-protocol/artifacts/build-info/ccec1582c8263ea0d9b8e8185e39d388.json

Contracts for the Pegasys Dex.

{
  "id": "ccec1582c8263ea0d9b8e8185e39d388",
  "_format": "hh-sol-build-info-1",
  "solcVersion": "0.5.16",
  "solcLongVersion": "0.5.16+commit.9c3226ce",
  "input": {
    "language": "Solidity",
    "sources": {
      "contracts/pegasys-core/PegasysPair.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity =0.5.16;\n\nimport \"./interfaces/IPegasysPair.sol\";\nimport \"./PegasysERC20.sol\";\nimport \"./libraries/Math.sol\";\nimport \"./libraries/UQ112x112.sol\";\nimport \"./interfaces/IERC20.sol\";\nimport \"./interfaces/IPegasysFactory.sol\";\nimport \"./interfaces/IPegasysCallee.sol\";\n\ncontract PegasysPair is IPegasysPair, PegasysERC20 {\n    using SafeMath for uint256;\n    using UQ112x112 for uint224;\n\n    uint256 public constant MINIMUM_LIQUIDITY = 10**3;\n    bytes4 private constant SELECTOR =\n        bytes4(keccak256(bytes(\"transfer(address,uint256)\")));\n\n    address public factory;\n    address public token0;\n    address public token1;\n\n    uint112 private reserve0; // uses single storage slot, accessible via getReserves\n    uint112 private reserve1; // uses single storage slot, accessible via getReserves\n    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves\n\n    uint256 public price0CumulativeLast;\n    uint256 public price1CumulativeLast;\n    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event\n\n    uint256 private unlocked = 1;\n    modifier lock() {\n        require(unlocked == 1, \"Pegasys: LOCKED\");\n        unlocked = 0;\n        _;\n        unlocked = 1;\n    }\n\n    function getReserves()\n        public\n        view\n        returns (\n            uint112 _reserve0,\n            uint112 _reserve1,\n            uint32 _blockTimestampLast\n        )\n    {\n        _reserve0 = reserve0;\n        _reserve1 = reserve1;\n        _blockTimestampLast = blockTimestampLast;\n    }\n\n    function _safeTransfer(\n        address token,\n        address to,\n        uint256 value\n    ) private {\n        (bool success, bytes memory data) = token.call(\n            abi.encodeWithSelector(SELECTOR, to, value)\n        );\n        require(\n            success && (data.length == 0 || abi.decode(data, (bool))),\n            \"Pegasys: TRANSFER_FAILED\"\n        );\n    }\n\n    event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n    event Burn(\n        address indexed sender,\n        uint256 amount0,\n        uint256 amount1,\n        address indexed to\n    );\n    event Swap(\n        address indexed sender,\n        uint256 amount0In,\n        uint256 amount1In,\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    constructor() public {\n        factory = msg.sender;\n    }\n\n    // called once by the factory at time of deployment\n    function initialize(address _token0, address _token1) external {\n        require(msg.sender == factory, \"Pegasys: FORBIDDEN\"); // sufficient check\n        token0 = _token0;\n        token1 = _token1;\n    }\n\n    // update reserves and, on the first call per block, price accumulators\n    function _update(\n        uint256 balance0,\n        uint256 balance1,\n        uint112 _reserve0,\n        uint112 _reserve1\n    ) private {\n        require(\n            balance0 <= uint112(-1) && balance1 <= uint112(-1),\n            \"Pegasys: OVERFLOW\"\n        );\n        uint32 blockTimestamp = uint32(block.timestamp % 2**32);\n        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired\n        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {\n            // * never overflows, and + overflow is desired\n            price0CumulativeLast +=\n                uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) *\n                timeElapsed;\n            price1CumulativeLast +=\n                uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) *\n                timeElapsed;\n        }\n        reserve0 = uint112(balance0);\n        reserve1 = uint112(balance1);\n        blockTimestampLast = blockTimestamp;\n        emit Sync(reserve0, reserve1);\n    }\n\n    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)\n    function _mintFee(uint112 _reserve0, uint112 _reserve1)\n        private\n        returns (bool feeOn)\n    {\n        address feeTo = IPegasysFactory(factory).feeTo();\n        feeOn = feeTo != address(0);\n        uint256 _kLast = kLast; // gas savings\n        if (feeOn) {\n            if (_kLast != 0) {\n                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));\n                uint256 rootKLast = Math.sqrt(_kLast);\n                if (rootK > rootKLast) {\n                    uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));\n                    uint256 denominator = rootK.mul(5).add(rootKLast);\n                    uint256 liquidity = numerator / denominator;\n                    if (liquidity > 0) _mint(feeTo, liquidity);\n                }\n            }\n        } else if (_kLast != 0) {\n            kLast = 0;\n        }\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function mint(address to) external lock returns (uint256 liquidity) {\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        uint256 balance0 = IERC20(token0).balanceOf(address(this));\n        uint256 balance1 = IERC20(token1).balanceOf(address(this));\n        uint256 amount0 = balance0.sub(_reserve0);\n        uint256 amount1 = balance1.sub(_reserve1);\n\n        bool feeOn = _mintFee(_reserve0, _reserve1);\n        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n        if (_totalSupply == 0) {\n            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);\n            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens\n        } else {\n            liquidity = Math.min(\n                amount0.mul(_totalSupply) / _reserve0,\n                amount1.mul(_totalSupply) / _reserve1\n            );\n        }\n        require(liquidity > 0, \"Pegasys: INSUFFICIENT_LIQUIDITY_MINTED\");\n        _mint(to, liquidity);\n\n        _update(balance0, balance1, _reserve0, _reserve1);\n        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n        emit Mint(msg.sender, amount0, amount1);\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function burn(address to)\n        external\n        lock\n        returns (uint256 amount0, uint256 amount1)\n    {\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        address _token0 = token0; // gas savings\n        address _token1 = token1; // gas savings\n        uint256 balance0 = IERC20(_token0).balanceOf(address(this));\n        uint256 balance1 = IERC20(_token1).balanceOf(address(this));\n        uint256 liquidity = balanceOf[address(this)];\n\n        bool feeOn = _mintFee(_reserve0, _reserve1);\n        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution\n        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution\n        require(\n            amount0 > 0 && amount1 > 0,\n            \"Pegasys: INSUFFICIENT_LIQUIDITY_BURNED\"\n        );\n        _burn(address(this), liquidity);\n        _safeTransfer(_token0, to, amount0);\n        _safeTransfer(_token1, to, amount1);\n        balance0 = IERC20(_token0).balanceOf(address(this));\n        balance1 = IERC20(_token1).balanceOf(address(this));\n\n        _update(balance0, balance1, _reserve0, _reserve1);\n        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n        emit Burn(msg.sender, amount0, amount1, to);\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function swap(\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address to,\n        bytes calldata data\n    ) external lock {\n        require(\n            amount0Out > 0 || amount1Out > 0,\n            \"Pegasys: INSUFFICIENT_OUTPUT_AMOUNT\"\n        );\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        require(\n            amount0Out < _reserve0 && amount1Out < _reserve1,\n            \"Pegasys: INSUFFICIENT_LIQUIDITY\"\n        );\n\n        uint256 balance0;\n        uint256 balance1;\n        {\n            // scope for _token{0,1}, avoids stack too deep errors\n            address _token0 = token0;\n            address _token1 = token1;\n            require(to != _token0 && to != _token1, \"Pegasys: INVALID_TO\");\n            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens\n            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens\n            if (data.length > 0)\n                IPegasysCallee(to).pegasysCall(\n                    msg.sender,\n                    amount0Out,\n                    amount1Out,\n                    data\n                );\n            balance0 = IERC20(_token0).balanceOf(address(this));\n            balance1 = IERC20(_token1).balanceOf(address(this));\n        }\n        uint256 amount0In = balance0 > _reserve0 - amount0Out\n            ? balance0 - (_reserve0 - amount0Out)\n            : 0;\n        uint256 amount1In = balance1 > _reserve1 - amount1Out\n            ? balance1 - (_reserve1 - amount1Out)\n            : 0;\n        require(\n            amount0In > 0 || amount1In > 0,\n            \"Pegasys: INSUFFICIENT_INPUT_AMOUNT\"\n        );\n        {\n            // scope for reserve{0,1}Adjusted, avoids stack too deep errors\n            uint256 balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));\n            uint256 balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));\n            require(\n                balance0Adjusted.mul(balance1Adjusted) >=\n                    uint256(_reserve0).mul(_reserve1).mul(1000**2),\n                \"Pegasys: K\"\n            );\n        }\n\n        _update(balance0, balance1, _reserve0, _reserve1);\n        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);\n    }\n\n    // force balances to match reserves\n    function skim(address to) external lock {\n        address _token0 = token0; // gas savings\n        address _token1 = token1; // gas savings\n        _safeTransfer(\n            _token0,\n            to,\n            IERC20(_token0).balanceOf(address(this)).sub(reserve0)\n        );\n        _safeTransfer(\n            _token1,\n            to,\n            IERC20(_token1).balanceOf(address(this)).sub(reserve1)\n        );\n    }\n\n    // force reserves to match balances\n    function sync() external lock {\n        _update(\n            IERC20(token0).balanceOf(address(this)),\n            IERC20(token1).balanceOf(address(this)),\n            reserve0,\n            reserve1\n        );\n    }\n}\n"
      },
      "contracts/pegasys-core/interfaces/IPegasysPair.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysPair {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external pure returns (string memory);\n\n    function symbol() external pure returns (string memory);\n\n    function decimals() external pure returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n    function nonces(address owner) external view returns (uint256);\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external;\n\n    event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n    event Burn(\n        address indexed sender,\n        uint256 amount0,\n        uint256 amount1,\n        address indexed to\n    );\n    event Swap(\n        address indexed sender,\n        uint256 amount0In,\n        uint256 amount1In,\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    function MINIMUM_LIQUIDITY() external pure returns (uint256);\n\n    function factory() external view returns (address);\n\n    function token0() external view returns (address);\n\n    function token1() external view returns (address);\n\n    function getReserves()\n        external\n        view\n        returns (\n            uint112 reserve0,\n            uint112 reserve1,\n            uint32 blockTimestampLast\n        );\n\n    function price0CumulativeLast() external view returns (uint256);\n\n    function price1CumulativeLast() external view returns (uint256);\n\n    function kLast() external view returns (uint256);\n\n    function mint(address to) external returns (uint256 liquidity);\n\n    function burn(address to)\n        external\n        returns (uint256 amount0, uint256 amount1);\n\n    function swap(\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address to,\n        bytes calldata data\n    ) external;\n\n    function skim(address to) external;\n\n    function sync() external;\n\n    function initialize(address, address) external;\n}\n"
      },
      "contracts/pegasys-core/PegasysERC20.sol": {
        "content": "pragma solidity =0.5.16;\n\nimport \"./interfaces/IPegasysERC20.sol\";\nimport \"./libraries/SafeMath.sol\";\n\ncontract PegasysERC20 is IPegasysERC20 {\n    using SafeMath for uint256;\n\n    string public constant name = \"Pegasys LP Token\";\n    string public constant symbol = \"PLP\";\n    uint8 public constant decimals = 18;\n    uint256 public totalSupply;\n    mapping(address => uint256) public balanceOf;\n    mapping(address => mapping(address => uint256)) public allowance;\n\n    bytes32 public DOMAIN_SEPARATOR;\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n    bytes32 public constant PERMIT_TYPEHASH =\n        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n    mapping(address => uint256) public nonces;\n\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    constructor() public {\n        uint256 chainId;\n        assembly {\n            chainId := chainid\n        }\n        DOMAIN_SEPARATOR = keccak256(\n            abi.encode(\n                keccak256(\n                    \"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"\n                ),\n                keccak256(bytes(name)),\n                keccak256(bytes(\"1\")),\n                chainId,\n                address(this)\n            )\n        );\n    }\n\n    function _mint(address to, uint256 value) internal {\n        totalSupply = totalSupply.add(value);\n        balanceOf[to] = balanceOf[to].add(value);\n        emit Transfer(address(0), to, value);\n    }\n\n    function _burn(address from, uint256 value) internal {\n        balanceOf[from] = balanceOf[from].sub(value);\n        totalSupply = totalSupply.sub(value);\n        emit Transfer(from, address(0), value);\n    }\n\n    function _approve(\n        address owner,\n        address spender,\n        uint256 value\n    ) private {\n        allowance[owner][spender] = value;\n        emit Approval(owner, spender, value);\n    }\n\n    function _transfer(\n        address from,\n        address to,\n        uint256 value\n    ) private {\n        balanceOf[from] = balanceOf[from].sub(value);\n        balanceOf[to] = balanceOf[to].add(value);\n        emit Transfer(from, to, value);\n    }\n\n    function approve(address spender, uint256 value) external returns (bool) {\n        _approve(msg.sender, spender, value);\n        return true;\n    }\n\n    function transfer(address to, uint256 value) external returns (bool) {\n        _transfer(msg.sender, to, value);\n        return true;\n    }\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool) {\n        if (allowance[from][msg.sender] != uint256(-1)) {\n            allowance[from][msg.sender] = allowance[from][msg.sender].sub(\n                value\n            );\n        }\n        _transfer(from, to, value);\n        return true;\n    }\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external {\n        require(deadline >= block.timestamp, \"Pegasys: EXPIRED\");\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                \"\\x19\\x01\",\n                DOMAIN_SEPARATOR,\n                keccak256(\n                    abi.encode(\n                        PERMIT_TYPEHASH,\n                        owner,\n                        spender,\n                        value,\n                        nonces[owner]++,\n                        deadline\n                    )\n                )\n            )\n        );\n        address recoveredAddress = ecrecover(digest, v, r, s);\n        require(\n            recoveredAddress != address(0) && recoveredAddress == owner,\n            \"Pegasys: INVALID_SIGNATURE\"\n        );\n        _approve(owner, spender, value);\n    }\n}\n"
      },
      "contracts/pegasys-core/libraries/Math.sol": {
        "content": "pragma solidity =0.5.16;\n\n// a library for performing various math operations\n\nlibrary Math {\n    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        z = x < y ? x : y;\n    }\n\n    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)\n    function sqrt(uint256 y) internal pure returns (uint256 z) {\n        if (y > 3) {\n            z = y;\n            uint256 x = y / 2 + 1;\n            while (x < z) {\n                z = x;\n                x = (y / x + x) / 2;\n            }\n        } else if (y != 0) {\n            z = 1;\n        }\n    }\n}\n"
      },
      "contracts/pegasys-core/libraries/UQ112x112.sol": {
        "content": "pragma solidity =0.5.16;\n\n// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))\n\n// range: [0, 2**112 - 1]\n// resolution: 1 / 2**112\n\nlibrary UQ112x112 {\n    uint224 constant Q112 = 2**112;\n\n    // encode a uint112 as a UQ112x112\n    function encode(uint112 y) internal pure returns (uint224 z) {\n        z = uint224(y) * Q112; // never overflows\n    }\n\n    // divide a UQ112x112 by a uint112, returning a UQ112x112\n    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {\n        z = x / uint224(y);\n    }\n}\n"
      },
      "contracts/pegasys-core/interfaces/IERC20.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IERC20 {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external view returns (string memory);\n\n    function symbol() external view returns (string memory);\n\n    function decimals() external view returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n}\n"
      },
      "contracts/pegasys-core/interfaces/IPegasysFactory.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysFactory {\n    event PairCreated(\n        address indexed token0,\n        address indexed token1,\n        address pair,\n        uint256\n    );\n\n    function feeTo() external view returns (address);\n\n    function feeToSetter() external view returns (address);\n\n    function getPair(address tokenA, address tokenB)\n        external\n        view\n        returns (address pair);\n\n    function allPairs(uint256) external view returns (address pair);\n\n    function allPairsLength() external view returns (uint256);\n\n    function createPair(address tokenA, address tokenB)\n        external\n        returns (address pair);\n\n    function setFeeTo(address) external;\n\n    function setFeeToSetter(address) external;\n}\n"
      },
      "contracts/pegasys-core/interfaces/IPegasysCallee.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysCallee {\n    function pegasysCall(\n        address sender,\n        uint256 amount0,\n        uint256 amount1,\n        bytes calldata data\n    ) external;\n}\n"
      },
      "contracts/pegasys-core/interfaces/IPegasysERC20.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysERC20 {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external pure returns (string memory);\n\n    function symbol() external pure returns (string memory);\n\n    function decimals() external pure returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n    function nonces(address owner) external view returns (uint256);\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external;\n}\n"
      },
      "contracts/pegasys-core/libraries/SafeMath.sol": {
        "content": "// SPDX-License-Identifier: GNU\npragma solidity =0.5.16;\n\n// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)\n\nlibrary SafeMath {\n    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require((z = x + y) >= x, \"ds-math-add-overflow\");\n    }\n\n    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require((z = x - y) <= x, \"ds-math-sub-underflow\");\n    }\n\n    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require(y == 0 || (z = x * y) / y == x, \"ds-math-mul-overflow\");\n    }\n}\n"
      },
      "contracts/pegasys-core/test/ERC20.sol": {
        "content": "pragma solidity =0.5.16;\n\nimport \"../PegasysERC20.sol\";\n\ncontract ERC20 is PegasysERC20 {\n    constructor(uint256 _totalSupply) public {\n        _mint(msg.sender, _totalSupply);\n    }\n}\n"
      },
      "contracts/pegasys-core/PegasysFactory.sol": {
        "content": "pragma solidity =0.5.16;\n\nimport \"./interfaces/IPegasysFactory.sol\";\nimport \"./PegasysPair.sol\";\n\ncontract PegasysFactory is IPegasysFactory {\n    address public feeTo;\n    address public feeToSetter;\n\n    mapping(address => mapping(address => address)) public getPair;\n    address[] public allPairs;\n\n    event PairCreated(\n        address indexed token0,\n        address indexed token1,\n        address pair,\n        uint256\n    );\n\n    constructor(address _feeToSetter) public {\n        feeToSetter = _feeToSetter;\n    }\n\n    function allPairsLength() external view returns (uint256) {\n        return allPairs.length;\n    }\n\n    function createPair(address tokenA, address tokenB)\n        external\n        returns (address pair)\n    {\n        require(tokenA != tokenB, \"Pegasys: IDENTICAL_ADDRESSES\");\n        (address token0, address token1) = tokenA < tokenB\n            ? (tokenA, tokenB)\n            : (tokenB, tokenA);\n        require(token0 != address(0), \"Pegasys: ZERO_ADDRESS\");\n        require(getPair[token0][token1] == address(0), \"Pegasys: PAIR_EXISTS\"); // single check is sufficient\n        bytes memory bytecode = type(PegasysPair).creationCode;\n        bytes32 salt = keccak256(abi.encodePacked(token0, token1));\n        assembly {\n            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)\n        }\n        IPegasysPair(pair).initialize(token0, token1);\n        getPair[token0][token1] = pair;\n        getPair[token1][token0] = pair; // populate mapping in the reverse direction\n        allPairs.push(pair);\n        emit PairCreated(token0, token1, pair, allPairs.length);\n    }\n\n    function setFeeTo(address _feeTo) external {\n        require(msg.sender == feeToSetter, \"Pegasys: FORBIDDEN\");\n        feeTo = _feeTo;\n    }\n\n    function setFeeToSetter(address _feeToSetter) external {\n        require(msg.sender == feeToSetter, \"Pegasys: FORBIDDEN\");\n        feeToSetter = _feeToSetter;\n    }\n}\n"
      },
      "contracts/flatten/PegasysFactoryFlatten.sol": {
        "content": "// Sources flattened with hardhat v2.7.0 https://hardhat.org\n\n// File contracts/pegasys-core/interfaces/IPegasysFactory.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysFactory {\n    event PairCreated(\n        address indexed token0,\n        address indexed token1,\n        address pair,\n        uint256\n    );\n\n    function feeTo() external view returns (address);\n\n    function feeToSetter() external view returns (address);\n\n    function getPair(address tokenA, address tokenB)\n        external\n        view\n        returns (address pair);\n\n    function allPairs(uint256) external view returns (address pair);\n\n    function allPairsLength() external view returns (uint256);\n\n    function createPair(address tokenA, address tokenB)\n        external\n        returns (address pair);\n\n    function setFeeTo(address) external;\n\n    function setFeeToSetter(address) external;\n}\n\n// File contracts/pegasys-core/interfaces/IPegasysPair.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysPair {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external pure returns (string memory);\n\n    function symbol() external pure returns (string memory);\n\n    function decimals() external pure returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n    function nonces(address owner) external view returns (uint256);\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external;\n\n    event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n    event Burn(\n        address indexed sender,\n        uint256 amount0,\n        uint256 amount1,\n        address indexed to\n    );\n    event Swap(\n        address indexed sender,\n        uint256 amount0In,\n        uint256 amount1In,\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    function MINIMUM_LIQUIDITY() external pure returns (uint256);\n\n    function factory() external view returns (address);\n\n    function token0() external view returns (address);\n\n    function token1() external view returns (address);\n\n    function getReserves()\n        external\n        view\n        returns (\n            uint112 reserve0,\n            uint112 reserve1,\n            uint32 blockTimestampLast\n        );\n\n    function price0CumulativeLast() external view returns (uint256);\n\n    function price1CumulativeLast() external view returns (uint256);\n\n    function kLast() external view returns (uint256);\n\n    function mint(address to) external returns (uint256 liquidity);\n\n    function burn(address to)\n        external\n        returns (uint256 amount0, uint256 amount1);\n\n    function swap(\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address to,\n        bytes calldata data\n    ) external;\n\n    function skim(address to) external;\n\n    function sync() external;\n\n    function initialize(address, address) external;\n}\n\n// File contracts/pegasys-core/interfaces/IPegasysERC20.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysERC20 {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external pure returns (string memory);\n\n    function symbol() external pure returns (string memory);\n\n    function decimals() external pure returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n\n    function nonces(address owner) external view returns (uint256);\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external;\n}\n\n// File contracts/pegasys-core/libraries/SafeMath.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity =0.5.16;\n\n// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)\n\nlibrary SafeMath {\n    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require((z = x + y) >= x, \"ds-math-add-overflow\");\n    }\n\n    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require((z = x - y) <= x, \"ds-math-sub-underflow\");\n    }\n\n    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        require(y == 0 || (z = x * y) / y == x, \"ds-math-mul-overflow\");\n    }\n}\n\n// File contracts/pegasys-core/PegasysERC20.sol\n\npragma solidity =0.5.16;\n\ncontract PegasysERC20 is IPegasysERC20 {\n    using SafeMath for uint256;\n\n    string public constant name = \"Pegasys LP Token\";\n    string public constant symbol = \"PLP\";\n    uint8 public constant decimals = 18;\n    uint256 public totalSupply;\n    mapping(address => uint256) public balanceOf;\n    mapping(address => mapping(address => uint256)) public allowance;\n\n    bytes32 public DOMAIN_SEPARATOR;\n    // keccak256(\"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\");\n    bytes32 public constant PERMIT_TYPEHASH =\n        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;\n    mapping(address => uint256) public nonces;\n\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    constructor() public {\n        uint256 chainId;\n        assembly {\n            chainId := chainid\n        }\n        DOMAIN_SEPARATOR = keccak256(\n            abi.encode(\n                keccak256(\n                    \"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"\n                ),\n                keccak256(bytes(name)),\n                keccak256(bytes(\"1\")),\n                chainId,\n                address(this)\n            )\n        );\n    }\n\n    function _mint(address to, uint256 value) internal {\n        totalSupply = totalSupply.add(value);\n        balanceOf[to] = balanceOf[to].add(value);\n        emit Transfer(address(0), to, value);\n    }\n\n    function _burn(address from, uint256 value) internal {\n        balanceOf[from] = balanceOf[from].sub(value);\n        totalSupply = totalSupply.sub(value);\n        emit Transfer(from, address(0), value);\n    }\n\n    function _approve(\n        address owner,\n        address spender,\n        uint256 value\n    ) private {\n        allowance[owner][spender] = value;\n        emit Approval(owner, spender, value);\n    }\n\n    function _transfer(\n        address from,\n        address to,\n        uint256 value\n    ) private {\n        balanceOf[from] = balanceOf[from].sub(value);\n        balanceOf[to] = balanceOf[to].add(value);\n        emit Transfer(from, to, value);\n    }\n\n    function approve(address spender, uint256 value) external returns (bool) {\n        _approve(msg.sender, spender, value);\n        return true;\n    }\n\n    function transfer(address to, uint256 value) external returns (bool) {\n        _transfer(msg.sender, to, value);\n        return true;\n    }\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool) {\n        if (allowance[from][msg.sender] != uint256(-1)) {\n            allowance[from][msg.sender] = allowance[from][msg.sender].sub(\n                value\n            );\n        }\n        _transfer(from, to, value);\n        return true;\n    }\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external {\n        require(deadline >= block.timestamp, \"Pegasys: EXPIRED\");\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                \"\\x19\\x01\",\n                DOMAIN_SEPARATOR,\n                keccak256(\n                    abi.encode(\n                        PERMIT_TYPEHASH,\n                        owner,\n                        spender,\n                        value,\n                        nonces[owner]++,\n                        deadline\n                    )\n                )\n            )\n        );\n        address recoveredAddress = ecrecover(digest, v, r, s);\n        require(\n            recoveredAddress != address(0) && recoveredAddress == owner,\n            \"Pegasys: INVALID_SIGNATURE\"\n        );\n        _approve(owner, spender, value);\n    }\n}\n\n// File contracts/pegasys-core/libraries/Math.sol\n\npragma solidity =0.5.16;\n\n// a library for performing various math operations\n\nlibrary Math {\n    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {\n        z = x < y ? x : y;\n    }\n\n    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)\n    function sqrt(uint256 y) internal pure returns (uint256 z) {\n        if (y > 3) {\n            z = y;\n            uint256 x = y / 2 + 1;\n            while (x < z) {\n                z = x;\n                x = (y / x + x) / 2;\n            }\n        } else if (y != 0) {\n            z = 1;\n        }\n    }\n}\n\n// File contracts/pegasys-core/libraries/UQ112x112.sol\n\npragma solidity =0.5.16;\n\n// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))\n\n// range: [0, 2**112 - 1]\n// resolution: 1 / 2**112\n\nlibrary UQ112x112 {\n    uint224 constant Q112 = 2**112;\n\n    // encode a uint112 as a UQ112x112\n    function encode(uint112 y) internal pure returns (uint224 z) {\n        z = uint224(y) * Q112; // never overflows\n    }\n\n    // divide a UQ112x112 by a uint112, returning a UQ112x112\n    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {\n        z = x / uint224(y);\n    }\n}\n\n// File contracts/pegasys-core/interfaces/IERC20.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IERC20 {\n    event Approval(\n        address indexed owner,\n        address indexed spender,\n        uint256 value\n    );\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    function name() external view returns (string memory);\n\n    function symbol() external view returns (string memory);\n\n    function decimals() external view returns (uint8);\n\n    function totalSupply() external view returns (uint256);\n\n    function balanceOf(address owner) external view returns (uint256);\n\n    function allowance(address owner, address spender)\n        external\n        view\n        returns (uint256);\n\n    function approve(address spender, uint256 value) external returns (bool);\n\n    function transfer(address to, uint256 value) external returns (bool);\n\n    function transferFrom(\n        address from,\n        address to,\n        uint256 value\n    ) external returns (bool);\n}\n\n// File contracts/pegasys-core/interfaces/IPegasysCallee.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity >=0.5.0;\n\ninterface IPegasysCallee {\n    function pegasysCall(\n        address sender,\n        uint256 amount0,\n        uint256 amount1,\n        bytes calldata data\n    ) external;\n}\n\n// File contracts/pegasys-core/PegasysPair.sol\n\n// SPDX-License-Identifier: GNU\npragma solidity =0.5.16;\n\ncontract PegasysPair is IPegasysPair, PegasysERC20 {\n    using SafeMath for uint256;\n    using UQ112x112 for uint224;\n\n    uint256 public constant MINIMUM_LIQUIDITY = 10**3;\n    bytes4 private constant SELECTOR =\n        bytes4(keccak256(bytes(\"transfer(address,uint256)\")));\n\n    address public factory;\n    address public token0;\n    address public token1;\n\n    uint112 private reserve0; // uses single storage slot, accessible via getReserves\n    uint112 private reserve1; // uses single storage slot, accessible via getReserves\n    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves\n\n    uint256 public price0CumulativeLast;\n    uint256 public price1CumulativeLast;\n    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event\n\n    uint256 private unlocked = 1;\n    modifier lock() {\n        require(unlocked == 1, \"Pegasys: LOCKED\");\n        unlocked = 0;\n        _;\n        unlocked = 1;\n    }\n\n    function getReserves()\n        public\n        view\n        returns (\n            uint112 _reserve0,\n            uint112 _reserve1,\n            uint32 _blockTimestampLast\n        )\n    {\n        _reserve0 = reserve0;\n        _reserve1 = reserve1;\n        _blockTimestampLast = blockTimestampLast;\n    }\n\n    function _safeTransfer(\n        address token,\n        address to,\n        uint256 value\n    ) private {\n        (bool success, bytes memory data) = token.call(\n            abi.encodeWithSelector(SELECTOR, to, value)\n        );\n        require(\n            success && (data.length == 0 || abi.decode(data, (bool))),\n            \"Pegasys: TRANSFER_FAILED\"\n        );\n    }\n\n    event Mint(address indexed sender, uint256 amount0, uint256 amount1);\n    event Burn(\n        address indexed sender,\n        uint256 amount0,\n        uint256 amount1,\n        address indexed to\n    );\n    event Swap(\n        address indexed sender,\n        uint256 amount0In,\n        uint256 amount1In,\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    constructor() public {\n        factory = msg.sender;\n    }\n\n    // called once by the factory at time of deployment\n    function initialize(address _token0, address _token1) external {\n        require(msg.sender == factory, \"Pegasys: FORBIDDEN\"); // sufficient check\n        token0 = _token0;\n        token1 = _token1;\n    }\n\n    // update reserves and, on the first call per block, price accumulators\n    function _update(\n        uint256 balance0,\n        uint256 balance1,\n        uint112 _reserve0,\n        uint112 _reserve1\n    ) private {\n        require(\n            balance0 <= uint112(-1) && balance1 <= uint112(-1),\n            \"Pegasys: OVERFLOW\"\n        );\n        uint32 blockTimestamp = uint32(block.timestamp % 2**32);\n        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired\n        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {\n            // * never overflows, and + overflow is desired\n            price0CumulativeLast +=\n                uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) *\n                timeElapsed;\n            price1CumulativeLast +=\n                uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) *\n                timeElapsed;\n        }\n        reserve0 = uint112(balance0);\n        reserve1 = uint112(balance1);\n        blockTimestampLast = blockTimestamp;\n        emit Sync(reserve0, reserve1);\n    }\n\n    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)\n    function _mintFee(uint112 _reserve0, uint112 _reserve1)\n        private\n        returns (bool feeOn)\n    {\n        address feeTo = IPegasysFactory(factory).feeTo();\n        feeOn = feeTo != address(0);\n        uint256 _kLast = kLast; // gas savings\n        if (feeOn) {\n            if (_kLast != 0) {\n                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));\n                uint256 rootKLast = Math.sqrt(_kLast);\n                if (rootK > rootKLast) {\n                    uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));\n                    uint256 denominator = rootK.mul(5).add(rootKLast);\n                    uint256 liquidity = numerator / denominator;\n                    if (liquidity > 0) _mint(feeTo, liquidity);\n                }\n            }\n        } else if (_kLast != 0) {\n            kLast = 0;\n        }\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function mint(address to) external lock returns (uint256 liquidity) {\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        uint256 balance0 = IERC20(token0).balanceOf(address(this));\n        uint256 balance1 = IERC20(token1).balanceOf(address(this));\n        uint256 amount0 = balance0.sub(_reserve0);\n        uint256 amount1 = balance1.sub(_reserve1);\n\n        bool feeOn = _mintFee(_reserve0, _reserve1);\n        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n        if (_totalSupply == 0) {\n            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);\n            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens\n        } else {\n            liquidity = Math.min(\n                amount0.mul(_totalSupply) / _reserve0,\n                amount1.mul(_totalSupply) / _reserve1\n            );\n        }\n        require(liquidity > 0, \"Pegasys: INSUFFICIENT_LIQUIDITY_MINTED\");\n        _mint(to, liquidity);\n\n        _update(balance0, balance1, _reserve0, _reserve1);\n        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n        emit Mint(msg.sender, amount0, amount1);\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function burn(address to)\n        external\n        lock\n        returns (uint256 amount0, uint256 amount1)\n    {\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        address _token0 = token0; // gas savings\n        address _token1 = token1; // gas savings\n        uint256 balance0 = IERC20(_token0).balanceOf(address(this));\n        uint256 balance1 = IERC20(_token1).balanceOf(address(this));\n        uint256 liquidity = balanceOf[address(this)];\n\n        bool feeOn = _mintFee(_reserve0, _reserve1);\n        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee\n        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution\n        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution\n        require(\n            amount0 > 0 && amount1 > 0,\n            \"Pegasys: INSUFFICIENT_LIQUIDITY_BURNED\"\n        );\n        _burn(address(this), liquidity);\n        _safeTransfer(_token0, to, amount0);\n        _safeTransfer(_token1, to, amount1);\n        balance0 = IERC20(_token0).balanceOf(address(this));\n        balance1 = IERC20(_token1).balanceOf(address(this));\n\n        _update(balance0, balance1, _reserve0, _reserve1);\n        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date\n        emit Burn(msg.sender, amount0, amount1, to);\n    }\n\n    // this low-level function should be called from a contract which performs important safety checks\n    function swap(\n        uint256 amount0Out,\n        uint256 amount1Out,\n        address to,\n        bytes calldata data\n    ) external lock {\n        require(\n            amount0Out > 0 || amount1Out > 0,\n            \"Pegasys: INSUFFICIENT_OUTPUT_AMOUNT\"\n        );\n        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings\n        require(\n            amount0Out < _reserve0 && amount1Out < _reserve1,\n            \"Pegasys: INSUFFICIENT_LIQUIDITY\"\n        );\n\n        uint256 balance0;\n        uint256 balance1;\n        {\n            // scope for _token{0,1}, avoids stack too deep errors\n            address _token0 = token0;\n            address _token1 = token1;\n            require(to != _token0 && to != _token1, \"Pegasys: INVALID_TO\");\n            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens\n            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens\n            if (data.length > 0)\n                IPegasysCallee(to).pegasysCall(\n                    msg.sender,\n                    amount0Out,\n                    amount1Out,\n                    data\n                );\n            balance0 = IERC20(_token0).balanceOf(address(this));\n            balance1 = IERC20(_token1).balanceOf(address(this));\n        }\n        uint256 amount0In = balance0 > _reserve0 - amount0Out\n            ? balance0 - (_reserve0 - amount0Out)\n            : 0;\n        uint256 amount1In = balance1 > _reserve1 - amount1Out\n            ? balance1 - (_reserve1 - amount1Out)\n            : 0;\n        require(\n            amount0In > 0 || amount1In > 0,\n            \"Pegasys: INSUFFICIENT_INPUT_AMOUNT\"\n        );\n        {\n            // scope for reserve{0,1}Adjusted, avoids stack too deep errors\n            uint