// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.5.12;
pragma experimental ABIEncoderV2;


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal {}
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address _payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this;
        // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

interface PoolInterface {
    function swapExactAmountIn(address, address, address, uint, address, uint) external returns (uint, uint);

    function swapExactAmountOut(address, address, uint, address, uint, address, uint) external returns (uint, uint);

    function calcInGivenOut(uint, uint, uint, uint, uint, uint) external pure returns (uint);

    function calcOutGivenIn(uint, uint, uint, uint, uint, uint) external pure returns (uint);

    function getDenormalizedWeight(address) external view returns (uint);

    function getBalance(address) external view returns (uint);

    function getSwapFee() external view returns (uint);

    function gulp(address) external;

    function calcDesireByGivenAmount(address, address, uint256, uint256) view external returns (uint);

    function calcPoolSpotPrice(address, address, uint256, uint256) external view returns (uint256);
}

interface TokenInterface {
    function balanceOf(address) external view returns (uint);

    function allowance(address, address) external view returns (uint);

    function approve(address, uint) external returns (bool);

    function transfer(address, uint) external returns (bool);

    function transferFrom(address, address, uint) external returns (bool);

    function deposit() external payable;

    function withdraw(uint) external;
}

interface RegistryInterface {
    function getBestPoolsWithLimit(address, address, uint) external view returns (address[] memory);
}

contract ExchangeProxy is Ownable {

    using SafeMath for uint256;

    struct Pool {
        address pool;
        uint tokenBalanceIn;
        uint tokenWeightIn;
        uint tokenBalanceOut;
        uint tokenWeightOut;
        uint swapFee;
        uint effectiveLiquidity;
    }

    struct Swap {
        address pool;
        address tokenIn;
        address tokenOut;
        uint swapAmount; // tokenInAmount / tokenOutAmount
        uint limitReturnAmount; // minAmountOut / maxAmountIn
        uint maxPrice;
    }

    TokenInterface weth;
    RegistryInterface registry;
    address private constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
    uint private constant BONE = 10 ** 18;

    constructor(address _weth) public {
        weth = TokenInterface(_weth);
    }

    function setRegistry(address _registry) external onlyOwner {
        registry = RegistryInterface(_registry);
    }

    function batchSwapExactIn(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
    public payable
    returns (uint totalAmountOut)
    {
        address from = msg.sender;
        if (isETH(tokenIn)) {
            require(msg.value >= totalAmountIn, "ERROR_ETH_IN");
            weth.deposit.value(totalAmountIn)();
            from = address(this);
        }
        uint _totalSwapIn = 0;
        for (uint i = 0; i < swaps.length; i++) {
            Swap memory swap = swaps[i];
            require(swap.tokenIn == address(tokenIn) || (swap.tokenIn == address(weth) && isETH(tokenIn)), "ERR_TOKENIN_NOT_MATCH");
            safeTransferFrom(swap.tokenIn, from, swap.pool, swap.swapAmount);
            address _to = (swap.tokenOut == address(weth) && isETH(tokenOut)) ? address(this) : msg.sender;
            PoolInterface pool = PoolInterface(swap.pool);
            (uint tokenAmountOut,) = pool.swapExactAmountIn(
                msg.sender,
                swap.tokenIn,
                swap.tokenOut,
                swap.limitReturnAmount,
                _to,
                swap.maxPrice
            );
            if (_to != msg.sender) {
                transferAll(tokenOut, tokenAmountOut);
            }
            totalAmountOut = tokenAmountOut.add(totalAmountOut);
            _totalSwapIn = _totalSwapIn.add(swap.swapAmount);
        }
        require(_totalSwapIn == totalAmountIn, "ERR_TOTAL_AMOUNT_IN");
        require(totalAmountOut >= minTotalAmountOut, "ERR_LIMIT_OUT");
        if (isETH(tokenIn) && msg.value > _totalSwapIn) {
            (bool xfer,) = msg.sender.call.value(msg.value.sub(_totalSwapIn))("");
            require(xfer, "ERR_ETH_FAILED");
        }
    }

    function batchSwapExactOut(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
    public payable
    returns (uint totalAmountIn)
    {
        address from = msg.sender;
        if (isETH(tokenIn)) {
            weth.deposit.value(msg.value)();
            from = address(this);
        }
        for (uint i = 0; i < swaps.length; i++) {
            Swap memory swap = swaps[i];
            uint tokenAmountIn = getAmountIn(swap);
            swap.tokenIn = isETH(tokenIn) ? address(weth) : swap.tokenIn;
            safeTransferFrom(swap.tokenIn, from, swap.pool, tokenAmountIn);
            address _to = (swap.tokenOut == address(weth) && isETH(tokenOut)) ? address(this) : msg.sender;
            PoolInterface pool = PoolInterface(swap.pool);
            pool.swapExactAmountOut(
                msg.sender,
                swap.tokenIn,
                swap.limitReturnAmount,
                swap.tokenOut,
                swap.swapAmount,
                _to,
                swap.maxPrice
            );
            if (_to != msg.sender) {
                transferAll(tokenOut, swap.swapAmount);
            }
            totalAmountIn = tokenAmountIn.add(totalAmountIn);
        }
        require(totalAmountIn <= maxTotalAmountIn, "ERR_LIMIT_IN");
        if (isETH(tokenIn) && msg.value > totalAmountIn) {
            transferAll(tokenIn, msg.value.sub(totalAmountIn));
        }
    }

    function multihopBatchSwapExactIn(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
    public payable
    returns (uint totalAmountOut)
    {
        uint totalSwapAmount = 0;
        address from = msg.sender;
        if (isETH(tokenIn)) {
            require(msg.value >= totalAmountIn, "ERROR_ETH_IN");
            weth.deposit.value(totalAmountIn)();
            from = address(this);
        }
        for (uint i = 0; i < swapSequences.length; i++) {
            totalSwapAmount = totalSwapAmount.add(swapSequences[i][0].swapAmount);
            require(swapSequences[i][0].tokenIn == address(tokenIn) || (isETH(tokenIn) && swapSequences[i][0].tokenIn == address(weth)), "ERR_TOKENIN_NOT_MATCH");
            safeTransferFrom(swapSequences[i][0].tokenIn, from, swapSequences[i][0].pool, swapSequences[i][0].swapAmount);

            uint tokenAmountOut;
            for (uint k = 0; k < swapSequences[i].length; k++) {
                Swap memory swap = swapSequences[i][k];
                PoolInterface pool = PoolInterface(swap.pool);
                address _to;
                if (k < swapSequences[i].length - 1) {
                    _to = swapSequences[i][k + 1].pool;
                } else {
                    require(swap.tokenOut == address(tokenOut) || (swap.tokenOut == address(weth) && isETH(tokenOut)), "ERR_OUTCOIN_NOT_MATCH");
                    _to = (swap.tokenOut == address(weth) && isETH(tokenOut)) ? address(this) : msg.sender;
                }
                (tokenAmountOut,) = pool.swapExactAmountIn(
                    msg.sender,
                    swap.tokenIn,
                    swap.tokenOut,
                    swap.limitReturnAmount,
                    _to,
                    swap.maxPrice
                );
                if (k == swapSequences[i].length - 1 && _to != msg.sender) {
                    transferAll(tokenOut, tokenAmountOut);
                }
            }
            // This takes the amountOut of the last swap
            totalAmountOut = tokenAmountOut.add(totalAmountOut);
        }
        require(totalSwapAmount == totalAmountIn, "ERR_TOTAL_AMOUNT_IN");
        require(totalAmountOut >= minTotalAmountOut, "ERR_LIMIT_OUT");
        if (isETH(tokenIn) && msg.value > totalSwapAmount) {
            (bool xfer,) = msg.sender.call.value(msg.value.sub(totalAmountIn))("");
            require(xfer, "ERR_ETH_FAILED");
        }
    }

    function multihopBatchSwapExactOut(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
    public payable
    returns (uint totalAmountIn)
    {
        address from = msg.sender;
        if (isETH(tokenIn)) {
            require(msg.value >= maxTotalAmountIn, "ERROR_ETH_IN");
            weth.deposit.value(msg.value)();
            from = address(this);
        }

        for (uint i = 0; i < swapSequences.length; i++) {
            uint[] memory amountIns = getAmountsIn(swapSequences[i]);
            swapSequences[i][0].tokenIn = isETH(tokenIn) ? address(weth) : swapSequences[i][0].tokenIn;
            safeTransferFrom(swapSequences[i][0].tokenIn, from, swapSequences[i][0].pool, amountIns[0]);

            for (uint j = 0; j < swapSequences[i].length; j++) {
                Swap memory swap = swapSequences[i][j];
                PoolInterface pool = PoolInterface(swap.pool);
                address _to;
                if (j < swapSequences[i].length - 1) {
                    _to = swapSequences[i][j + 1].pool;
                } else {
                    require(swap.tokenOut == address(tokenOut) || (swap.tokenOut == address(weth) && isETH(tokenOut)), "ERR_OUTCOIN_NOT_MATCH");
                    _to = (swap.tokenOut == address(weth) && isETH(tokenOut)) ? address(this) : msg.sender;
                }
                uint _tokenOut = j < swapSequences[i].length - 1 ? amountIns[j + 1] : swap.swapAmount;
                pool.swapExactAmountOut(
                    msg.sender,
                    swap.tokenIn,
                    amountIns[j],
                    swap.tokenOut,
                    _tokenOut,
                    _to,
                    swap.maxPrice
                );
                if (j == swapSequences[i].length - 1 && _to != msg.sender) {
                    transferAll(tokenOut, _tokenOut);
                }
            }
            totalAmountIn = totalAmountIn.add(amountIns[0]);
        }
        require(totalAmountIn <= maxTotalAmountIn, "ERR_LIMIT_IN");
        if (isETH(tokenIn) && msg.value > totalAmountIn) {
            transferAll(tokenIn, msg.value.sub(totalAmountIn));
        }
    }

    function getBalance(TokenInterface token) internal view returns (uint) {
        if (isETH(token)) {
            return weth.balanceOf(address(this));
        } else {
            return token.balanceOf(address(this));
        }
    }

    function transferAll(TokenInterface token, uint amount) internal{
        if (amount == 0) {
            return;
        }

        if (isETH(token)) {
            weth.withdraw(amount);
            (bool xfer,) = msg.sender.call.value(amount)("");
            require(xfer, "ERR_ETH_FAILED");
        } else {
            safeTransfer(address(token), msg.sender, amount);
        }
    }

    function isETH(TokenInterface token) internal pure returns (bool) {
        return (address(token) == ETH_ADDRESS);
    }

    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    // given an output amount of an asset and pool, returns a required input amount of the other asset
    function getAmountIn(Swap memory swap) internal view returns (uint amountIn) {
        require(swap.swapAmount > 0, 'ExchangeProxy: INSUFFICIENT_OUTPUT_AMOUNT');
        PoolInterface pool = PoolInterface(swap.pool);
        amountIn = pool.calcDesireByGivenAmount(
            swap.tokenIn,
            swap.tokenOut,
            0,
            swap.swapAmount
        );
        uint256 spotPrice = pool.calcPoolSpotPrice(
            swap.tokenIn,
            swap.tokenOut,
            0,
            0
        );
        require(spotPrice <= swap.maxPrice, "ERR_LIMIT_PRICE");
    }

    // performs chained getAmountIn calculations on any number of pools
    function getAmountsIn(Swap[] memory swaps) internal view returns (uint[] memory amounts) {
        require(swaps.length >= 1, 'ExchangeProxy: INVALID_PATH');
        amounts = new uint[](swaps.length);
        uint i = swaps.length - 1;
        while (i > 0) {
            Swap memory swap = swaps[i];
            amounts[i] = getAmountIn(swap);
            require(swaps[i].tokenIn == swaps[i - 1].tokenOut, "ExchangeProxy: INVALID_PATH");
            swaps[i - 1].swapAmount = amounts[i];
            i--;
        }
        amounts[0] = getAmountIn(swaps[0]);
    }

    function() external payable {}

}

{"MColor.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\ncontract MColor {\n    function getColor()\n    external view\n    returns (bytes32);\n}\n\ncontract MBronze is MColor {\n    function getColor()\n    external view\n    returns (bytes32) {\n        return bytes32(\"BRONZE\");\n    }\n}\n"},"MConst.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MColor.sol\";\n\ncontract MConst is MBronze {\n    uint internal constant BONE              = 10**18;\n\n    uint internal constant MIN_BOUND_TOKENS  = 2;\n    uint internal constant MAX_BOUND_TOKENS  = 8;\n\n    uint internal constant MIN_FEE           = BONE / 10**6;\n    uint internal constant MAX_FEE           = BONE / 10;\n\n    uint internal constant MIN_WEIGHT        = BONE;\n    uint internal constant MAX_WEIGHT        = BONE * 50;\n    uint internal constant MAX_TOTAL_WEIGHT  = BONE * 50;\n    uint internal constant MIN_BALANCE       = BONE / 10**12;\n\n    uint internal constant INIT_POOL_SUPPLY  = BONE * 100;\n\n    uint internal constant MIN_BPOW_BASE     = 1 wei;\n    uint internal constant MAX_BPOW_BASE     = (2 * BONE) - 1 wei;\n    uint internal constant BPOW_PRECISION    = BONE / 10**10;\n\n    uint internal constant MAX_IN_RATIO      = BONE / 2;\n    uint internal constant MAX_OUT_RATIO     = (BONE / 3) + 1 wei;\n}\n"},"MMath.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MNum.sol\";\n\ncontract MMath is MBronze, MConst, MNum {\n    /**********************************************************************************************\n    // calcSpotPrice                                                                             //\n    // sP = spotPrice                                                                            //\n    // bI = tokenBalanceIn                ( bI / wI )         1                                  //\n    // bO = tokenBalanceOut         sP =  -----------  *  ----------                             //\n    // wI = tokenWeightIn                 ( bO / wO )     ( 1 - sF )                             //\n    // wO = tokenWeightOut                                                                       //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcSpotPrice(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint swapFee\n    )\n    public pure\n    returns (uint spotPrice)\n    {\n        uint numer = bdiv(tokenBalanceIn, tokenWeightIn);\n        uint denom = bdiv(tokenBalanceOut, tokenWeightOut);\n        uint ratio = bdiv(numer, denom);\n        uint scale = bdiv(BONE, bsub(BONE, swapFee));\n        return  (spotPrice = bmul(ratio, scale));\n    }\n\n    /**********************************************************************************************\n    // calcOutGivenIn                                                                            //\n    // aO = tokenAmountOut                                                                       //\n    // bO = tokenBalanceOut                                                                      //\n    // bI = tokenBalanceIn              /      /            bI             \\    (wI / wO) \\      //\n    // aI = tokenAmountIn    aO = bO * |  1 - | --------------------------  | ^            |     //\n    // wI = tokenWeightIn               \\      \\ ( bI + ( aI * ( 1 - sF )) /              /      //\n    // wO = tokenWeightOut                                                                       //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcOutGivenIn(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint tokenAmountIn,\n        uint swapFee\n    )\n    public pure\n    returns (uint tokenAmountOut)\n    {\n        uint weightRatio = bdiv(tokenWeightIn, tokenWeightOut);\n        uint adjustedIn = bsub(BONE, swapFee);\n        adjustedIn = bmul(tokenAmountIn, adjustedIn);\n        uint y = bdiv(tokenBalanceIn, badd(tokenBalanceIn, adjustedIn));\n        uint foo = bpow(y, weightRatio);\n        uint bar = bsub(BONE, foo);\n        tokenAmountOut = bmul(tokenBalanceOut, bar);\n        return tokenAmountOut;\n    }\n\n    /**********************************************************************************************\n    // calcInGivenOut                                                                            //\n    // aI = tokenAmountIn                                                                        //\n    // bO = tokenBalanceOut               /  /     bO      \\    (wO / wI)      \\                 //\n    // bI = tokenBalanceIn          bI * |  | ------------  | ^            - 1  |                //\n    // aO = tokenAmountOut    aI =        \\  \\ ( bO - aO ) /                   /                 //\n    // wI = tokenWeightIn           --------------------------------------------                 //\n    // wO = tokenWeightOut                          ( 1 - sF )                                   //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcInGivenOut(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint tokenAmountOut,\n        uint swapFee\n    )\n    public pure\n    returns (uint tokenAmountIn)\n    {\n        uint weightRatio = bdiv(tokenWeightOut, tokenWeightIn);\n        uint diff = bsub(tokenBalanceOut, tokenAmountOut);\n        uint y = bdiv(tokenBalanceOut, diff);\n        uint foo = bpow(y, weightRatio);\n        foo = bsub(foo, BONE);\n        tokenAmountIn = bsub(BONE, swapFee);\n        tokenAmountIn = bdiv(bmul(tokenBalanceIn, foo), tokenAmountIn);\n        return tokenAmountIn;\n    }\n\n    /**********************************************************************************************\n    // calcPoolOutGivenSingleIn                                                                  //\n    // pAo = poolAmountOut         /                                              \\              //\n    // tAi = tokenAmountIn        ///      /     //    wI \\      \\\\       \\     wI \\             //\n    // wI = tokenWeightIn        //| tAi *| 1 - || 1 - --  | * sF || + tBi \\    --  \\            //\n    // tW = totalWeight     pAo=||  \\      \\     \\\\    tW /      //         | ^ tW   | * pS - pS //\n    // tBi = tokenBalanceIn      \\\\  ------------------------------------- /        /            //\n    // pS = poolSupply            \\\\                    tBi               /        /             //\n    // sF = swapFee                \\                                              /              //\n    **********************************************************************************************/\n    function calcPoolOutGivenSingleIn(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint poolSupply,\n        uint totalWeight,\n        uint tokenAmountIn,\n        uint swapFee\n    )\n    internal pure\n    returns (uint poolAmountOut)\n    {\n        // Charge the trading fee for the proportion of tokenAi\n        ///  which is implicitly traded to the other pool tokens.\n        // That proportion is (1- weightTokenIn)\n        // tokenAiAfterFee = tAi * (1 - (1-weightTi) * poolFee);\n        uint normalizedWeight = bdiv(tokenWeightIn, totalWeight);\n        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee);\n        uint tokenAmountInAfterFee = bmul(tokenAmountIn, bsub(BONE, zaz));\n\n        uint newTokenBalanceIn = badd(tokenBalanceIn, tokenAmountInAfterFee);\n        uint tokenInRatio = bdiv(newTokenBalanceIn, tokenBalanceIn);\n\n        // uint newPoolSupply = (ratioTi ^ weightTi) * poolSupply;\n        uint poolRatio = bpow(tokenInRatio, normalizedWeight);\n        uint newPoolSupply = bmul(poolRatio, poolSupply);\n        poolAmountOut = bsub(newPoolSupply, poolSupply);\n        return poolAmountOut;\n    }\n\n    /**********************************************************************************************\n    // calcSingleOutGivenPoolIn                                                                  //\n    // tAo = tokenAmountOut            /      /                                             \\\\   //\n    // bO = tokenBalanceOut           /      //        pS - pAi       \\     /    1    \\      \\\\  //\n    // pAi = poolAmountIn            | bO - || ----------------------- | ^ | --------- | * b0 || //\n    // ps = poolSupply                \\      \\\\          pS           /     \\(wO / tW)/      //  //\n    // wI = tokenWeightIn      tAo =   \\      \\                                             //   //\n    // tW = totalWeight                    /     /      wO \\       \\                             //\n    // sF = swapFee                    *  | 1 - |  1 - ---- | * sF  |                            //\n    // eF = exitFee                        \\     \\      tW /       /                             //\n    **********************************************************************************************/\n    function calcSingleOutGivenPoolIn(\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint poolSupply,\n        uint totalWeight,\n        uint poolAmountIn,\n        uint swapFee\n    )\n    internal pure\n    returns (uint tokenAmountOut)\n    {\n        uint normalizedWeight = bdiv(tokenWeightOut, totalWeight);\n        // charge exit fee on the pool token side\n        // pAiAfterExitFee = pAi*(1-exitFee)\n        uint poolAmountInAfterExitFee = bmul(poolAmountIn, BONE);\n        uint newPoolSupply = bsub(poolSupply, poolAmountInAfterExitFee);\n        uint poolRatio = bdiv(newPoolSupply, poolSupply);\n\n        // newBalTo = poolRatio^(1/weightTo) * balTo;\n        uint tokenOutRatio = bpow(poolRatio, bdiv(BONE, normalizedWeight));\n        uint newTokenBalanceOut = bmul(tokenOutRatio, tokenBalanceOut);\n\n        uint tokenAmountOutBeforeSwapFee = bsub(tokenBalanceOut, newTokenBalanceOut);\n\n        // charge swap fee on the output token side\n        //uint tAo = tAoBeforeSwapFee * (1 - (1-weightTo) * swapFee)\n        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee);\n        tokenAmountOut = bmul(tokenAmountOutBeforeSwapFee, bsub(BONE, zaz));\n        return tokenAmountOut;\n    }\n\n}\n"},"MNum.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MConst.sol\";\n\ncontract MNum is MConst {\n\n    function btoi(uint a)\n    internal pure\n    returns (uint)\n    {\n        return a / BONE;\n    }\n\n    function bfloor(uint a)\n    internal pure\n    returns (uint)\n    {\n        return btoi(a) * BONE;\n    }\n\n    function badd(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        uint c = a + b;\n        require(c \u003e= a, \"ERR_ADD_OVERFLOW\");\n        return c;\n    }\n\n    function bsub(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        (uint c, bool flag) = bsubSign(a, b);\n        require(!flag, \"ERR_SUB_UNDERFLOW\");\n        return c;\n    }\n\n    function bsubSign(uint a, uint b)\n    internal pure\n    returns (uint, bool)\n    {\n        if (a \u003e= b) {\n            return (a - b, false);\n        } else {\n            return (b - a, true);\n        }\n    }\n\n    function bmul(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        uint c0 = a * b;\n        require(a == 0 || c0 / a == b, \"ERR_MUL_OVERFLOW\");\n        uint c1 = c0 + (BONE / 2);\n        require(c1 \u003e= c0, \"ERR_MUL_OVERFLOW\");\n        uint c2 = c1 / BONE;\n        return c2;\n    }\n\n    function bdiv(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        require(b != 0, \"ERR_DIV_ZERO\");\n        uint c0 = a * BONE;\n        require(a == 0 || c0 / a == BONE, \"ERR_DIV_INTERNAL\"); // bmul overflow\n        uint c1 = c0 + (b / 2);\n        require(c1 \u003e= c0, \"ERR_DIV_INTERNAL\"); //  badd require\n        uint c2 = c1 / b;\n        return c2;\n    }\n\n    // DSMath.wpow\n    function bpowi(uint a, uint n)\n    internal pure\n    returns (uint)\n    {\n        uint z = n % 2 != 0 ? a : BONE;\n\n        for (n /= 2; n != 0; n /= 2) {\n            a = bmul(a, a);\n\n            if (n % 2 != 0) {\n                z = bmul(z, a);\n            }\n        }\n        return z;\n    }\n\n    // Compute b^(e.w) by splitting it into (b^e)*(b^0.w).\n    // Use `bpowi` for `b^e` and `bpowK` for k iterations\n    // of approximation of b^0.w\n    function bpow(uint base, uint exp)\n    internal pure\n    returns (uint)\n    {\n        require(base \u003e= MIN_BPOW_BASE, \"ERR_BPOW_BASE_TOO_LOW\");\n        require(base \u003c= MAX_BPOW_BASE, \"ERR_BPOW_BASE_TOO_HIGH\");\n\n        uint whole  = bfloor(exp);\n        uint remain = bsub(exp, whole);\n\n        uint wholePow = bpowi(base, btoi(whole));\n\n        if (remain == 0) {\n            return wholePow;\n        }\n\n        uint partialResult = bpowApprox(base, remain, BPOW_PRECISION);\n        return bmul(wholePow, partialResult);\n    }\n\n    function bpowApprox(uint base, uint exp, uint precision)\n    internal pure\n    returns (uint)\n    {\n        // term 0:\n        uint a     = exp;\n        (uint x, bool xneg)  = bsubSign(base, BONE);\n        uint term = BONE;\n        uint sum   = term;\n        bool negative = false;\n\n\n        // term(k) = numer / denom \n        //         = (product(a - i - 1, i=1--\u003ek) * x^k) / (k!)\n        // each iteration, multiply previous term by (a-(k-1)) * x / k\n        // continue until term is less than precision\n        for (uint i = 1; term \u003e= precision; i++) {\n            uint bigK = i * BONE;\n            (uint c, bool cneg) = bsubSign(a, bsub(bigK, BONE));\n            term = bmul(term, bmul(c, x));\n            term = bdiv(term, bigK);\n            if (term == 0) break;\n\n            if (xneg) negative = !negative;\n            if (cneg) negative = !negative;\n            if (negative) {\n                sum = bsub(sum, term);\n            } else {\n                sum = badd(sum, term);\n            }\n        }\n\n        return sum;\n    }\n\n}\n"},"MPool.sol":{"content":"pragma solidity 0.5.12;\n\nimport \"./MToken.sol\";\nimport \"./MMath.sol\";\n\ninterface IMFactory {\n    function isWhiteList(address w) external view returns (bool);\n    function getMining() external returns (address lpMiningAdr, address swapMiningAdr);\n    function getFeeTo() external view returns (address);\n}\n\ninterface IMining {\n    // pair\n    function addLiquidity(bool isGp, address _user, uint256 _amount) external;\n    function removeLiquidity(bool isGp, address _user, uint256 _amount) external;\n    function updateGPInfo(address[] calldata gps, uint256[] calldata amounts) external;\n    // lp mining\n    function onTransferLiquidity(address from, address to, uint256 lpAmount) external;\n    function claimLiquidityShares(address user, address[] calldata tokens, uint256[] calldata balances, uint256[] calldata weights, uint256 amount, bool _add) external;\n    // swap mining\n    function claimSwapShare(address user, address tokenIn, uint256 amountIn, address tokenOut, uint256 amountOut) external;\n}\n\ninterface IPairFactory {\n    function newPair(address pool, uint256 perBlock, uint256 rate) external returns (IPairToken);\n    function getPairToken(address pool) external view returns (address);\n}\n\ninterface IPairToken {\n    function setController(address _controller) external ;\n}\n\ncontract MPool is MBronze, MToken, MMath {\n\n    struct Record {\n        bool bound;   // is token bound to pool\n        uint index;   // private\n        uint denorm;  // denormalized weight\n        uint balance;\n    }\n\n    event LOG_SWAP(\n        address indexed caller,\n        address indexed tokenIn,\n        address indexed tokenOut,\n        uint256 tokenAmountIn,\n        uint256 tokenAmountOut\n    );\n\n    event LOG_JOIN(\n        address indexed caller,\n        address indexed tokenIn,\n        uint256 tokenAmountIn\n    );\n\n    event LOG_EXIT(\n        address indexed caller,\n        address indexed tokenOut,\n        uint256 tokenAmountOut\n    );\n\n    event LOG_CALL(\n        bytes4  indexed sig,\n        address indexed caller,\n        bytes data\n    ) anonymous;\n\n    modifier _logs_() {\n        emit LOG_CALL(msg.sig, msg.sender, msg.data);\n        _;\n    }\n\n    modifier _lock_() {\n        require(!_mutex, \"ERR_REENTRY\");\n        _mutex = true;\n        _;\n        _mutex = false;\n    }\n\n    modifier _viewlock_() {\n        require(!_mutex, \"ERR_REENTRY\");\n        _;\n    }\n\n    bool private _mutex;\n\n    IMFactory private _factory;    // MFactory address to push token exitFee to and check whitelist from factory\n    IMining private _pair;\n    address public controller;     // has CONTROL role\n\n    // `setSwapFee` and `finalize` require CONTROL\n    // `finalize` sets `PUBLIC can SWAP`, `PUBLIC can JOIN`\n    uint private _swapFee;\n    bool private _finalized;\n    bool private _publicSwap;     // true if PUBLIC can call SWAP functions\n\n    address[] private _tokens;\n    mapping(address =\u003e Record) private  _records;\n    uint private _totalWeight;\n\n    constructor() public {\n        controller = msg.sender;\n        _factory = IMFactory(msg.sender);\n\n        _swapFee = MIN_FEE;\n        _publicSwap = false;\n        _finalized = false;\n    }\n\n    function isPublicSwap()\n    external view\n    returns (bool)\n    {\n        return _publicSwap;\n    }\n\n    function isFinalized()\n    external view\n    returns (bool)\n    {\n        return _finalized;\n    }\n\n    function isBound(address t)\n    external view\n    returns (bool)\n    {\n        return _records[t].bound;\n    }\n\n    function getNumTokens()\n    external view\n    returns (uint)\n    {\n        return _tokens.length;\n    }\n\n    function getCurrentTokens()\n    external view _viewlock_\n    returns (address[] memory tokens)\n    {\n        return _tokens;\n    }\n\n    function getFinalTokens()\n    external view\n    _viewlock_\n    returns (address[] memory tokens)\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n        return _tokens;\n    }\n\n    function getDenormalizedWeight(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        return _records[token].denorm;\n    }\n\n    function getTotalDenormalizedWeight()\n    external view\n    _viewlock_\n    returns (uint)\n    {\n        return _totalWeight;\n    }\n\n    function getNormalizedWeight(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        uint denorm = _records[token].denorm;\n        return bdiv(denorm, _totalWeight);\n    }\n\n    function getBalance(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        return _records[token].balance;\n    }\n\n    function getSwapFee()\n    external view\n    _viewlock_\n    returns (uint)\n    {\n        return _swapFee;\n    }\n\n    function getPair()\n    external view\n    _viewlock_\n    returns (address)\n    {\n        return address(_pair);\n    }\n\n    function setSwapFee(uint swapFee)\n    external\n    _logs_\n    _lock_\n    {\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(swapFee \u003e= MIN_FEE, \"ERR_MIN_FEE\");\n        require(swapFee \u003c= MAX_FEE, \"ERR_MAX_FEE\");\n        _swapFee = swapFee;\n    }\n\n    function setController(address manager)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        controller = manager;\n    }\n\n    function setPair(IMining pair)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        _setPair(pair);\n    }\n\n    function _setPair(IMining pair)\n    internal\n    {\n        _pair = pair;\n    }\n\n    function finalize(address beneficiary, uint fixPoolSupply)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(!_finalized || totalSupply() == 0, \"ERR_IS_FINALIZED\");\n        require(_tokens.length \u003e= MIN_BOUND_TOKENS, \"ERR_MIN_TOKENS\");\n\n        _finalized = true;\n        _publicSwap = true;\n\n        uint256 supply = fixPoolSupply == 0 ? INIT_POOL_SUPPLY : fixPoolSupply;\n\n        _mintPoolShare(supply);\n        _pushPoolShare(beneficiary, supply);\n        _lpChanging(true, beneficiary, supply);\n    }\n\n\n    function bind(address token, uint balance, uint denorm)\n    external\n    _logs_\n        // _lock_  Bind does not lock because it jumps to `rebind`, which does\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(!_records[token].bound, \"ERR_IS_BOUND\");\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n\n        require(_tokens.length \u003c MAX_BOUND_TOKENS, \"ERR_MAX_TOKENS\");\n\n        _records[token] = Record({\n        bound: true,\n        index: _tokens.length,\n        denorm: 0,    // balance and denorm will be validated\n        balance: 0    // and set by `rebind`\n        });\n        _tokens.push(token);\n        rebind(token, balance, denorm);\n    }\n\n    function rebind(address token, uint balance, uint denorm)\n    public\n    _logs_\n    _lock_\n    {\n\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        require(!_finalized || totalSupply() == 0, \"ERR_IS_FINALIZED\");\n\n        require(denorm \u003e= MIN_WEIGHT, \"ERR_MIN_WEIGHT\");\n        require(denorm \u003c= MAX_WEIGHT, \"ERR_MAX_WEIGHT\");\n        require(balance \u003e= MIN_BALANCE, \"ERR_MIN_BALANCE\");\n\n        // Adjust the denorm and totalWeight\n        uint oldWeight = _records[token].denorm;\n        if (denorm \u003e oldWeight) {\n            _totalWeight = badd(_totalWeight, bsub(denorm, oldWeight));\n            require(_totalWeight \u003c= MAX_TOTAL_WEIGHT, \"ERR_MAX_TOTAL_WEIGHT\");\n        } else if (denorm \u003c oldWeight) {\n            _totalWeight = bsub(_totalWeight, bsub(oldWeight, denorm));\n        }\n        _records[token].denorm = denorm;\n\n        // Adjust the balance record and actual token balance\n        uint oldBalance = _records[token].balance;\n        _records[token].balance = balance;\n        if (balance \u003e oldBalance) {\n            _pullUnderlying(token, msg.sender, bsub(balance, oldBalance));\n        } else if (balance \u003c oldBalance) {\n            uint tokenBalanceWithdrawn = bsub(oldBalance, balance);\n            _pushUnderlying(token, msg.sender, tokenBalanceWithdrawn);\n        }\n    }\n\n    function unbind(address token)\n    external\n    _logs_\n    _lock_\n    {\n\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n\n        uint tokenBalance = _records[token].balance;\n        _totalWeight = bsub(_totalWeight, _records[token].denorm);\n\n        // Swap the token-to-unbind with the last token,\n        // then delete the last token\n        uint index = _records[token].index;\n        uint last = _tokens.length - 1;\n        _tokens[index] = _tokens[last];\n        _records[_tokens[index]].index = index;\n        _tokens.pop();\n        _records[token] = Record({\n        bound: false,\n        index: 0,\n        denorm: 0,\n        balance: 0\n        });\n\n        _pushUnderlying(token, msg.sender, tokenBalance);\n    }\n\n    // Absorb any tokens that have been sent to this contract into the pool\n    function gulp(address token)\n    external\n    _logs_\n    _lock_\n    {\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        _records[token].balance = IERC20(token).balanceOf(address(this));\n    }\n\n    function getSpotPrice(address tokenIn, address tokenOut)\n    external view\n    _viewlock_\n    returns (uint spotPrice)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        Record storage inRecord = _records[tokenIn];\n        Record storage outRecord = _records[tokenOut];\n        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, _swapFee);\n    }\n\n    function getSpotPriceSansFee(address tokenIn, address tokenOut)\n    external view\n    _viewlock_\n    returns (uint spotPrice)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        Record storage inRecord = _records[tokenIn];\n        Record storage outRecord = _records[tokenOut];\n        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, 0);\n    }\n\n    function joinPool(address beneficiary, uint poolAmountOut)\n    external\n    _logs_\n    _lock_\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n\n        uint poolTotal = totalSupply();\n        uint ratio = bdiv(poolAmountOut, poolTotal);\n        require(ratio != 0, \"ERR_MATH_APPROX\");\n\n        for (uint i = 0; i \u003c _tokens.length; i++) {\n            address t = _tokens[i];\n            uint bal = _records[t].balance;\n            uint tokenAmountIn = bmul(ratio, bal);\n            require(tokenAmountIn != 0, \"ERR_MATH_APPROX\");\n            require(bsub(IERC20(_tokens[i]).balanceOf(address(this)), _records[t].balance) \u003e= tokenAmountIn);\n            _records[t].balance = badd(_records[t].balance, tokenAmountIn);\n            emit LOG_JOIN(msg.sender, t, tokenAmountIn);\n        }\n        _mintPoolShare(poolAmountOut);\n        _pushPoolShare(beneficiary, poolAmountOut);\n\n        _lpChanging(true, beneficiary, poolAmountOut);\n    }\n\n    function exitPool(uint poolAmountIn, uint[] calldata minAmountsOut)\n    external\n    _logs_\n    _lock_\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n\n        uint poolTotal = totalSupply();\n        uint ratio = bdiv(poolAmountIn, poolTotal);\n        require(ratio != 0, \"ERR_MATH_APPROX\");\n\n        _pullPoolShare(msg.sender, poolAmountIn);\n        _burnPoolShare(poolAmountIn);\n\n        for (uint i = 0; i \u003c _tokens.length; i++) {\n            address t = _tokens[i];\n            uint bal = _records[t].balance;\n            uint tokenAmountOut = bmul(ratio, bal);\n            require(tokenAmountOut != 0, \"ERR_MATH_APPROX\");\n            require(tokenAmountOut \u003e= minAmountsOut[i], \"ERR_LIMIT_OUT\");\n            _records[t].balance = bsub(_records[t].balance, tokenAmountOut);\n            emit LOG_EXIT(msg.sender, t, tokenAmountOut);\n            _pushUnderlying(t, msg.sender, tokenAmountOut);\n        }\n\n        _lpChanging(false, msg.sender, poolAmountIn);\n    }\n\n\n    function swapExactAmountIn(\n        address user,\n        address tokenIn,\n        address tokenOut,\n        uint minAmountOut,\n        address to,\n        uint maxPrice\n    )\n    external\n    _lock_\n    returns (uint tokenAmountOut, uint spotPriceAfter)\n    {\n\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        require(_publicSwap, \"ERR_SWAP_NOT_PUBLIC\");\n\n        Record storage inRecord = _records[address(tokenIn)];\n        Record storage outRecord = _records[address(tokenOut)];\n\n        uint tokenAmountIn = bsub(IERC20(tokenIn).balanceOf(address(this)), inRecord.balance);\n        require(tokenAmountIn \u003e 0, \"ERR_AMOUNTIN_NOT_IN_Pool\");\n        require(tokenAmountIn \u003c= bmul(inRecord.balance, MAX_IN_RATIO), \"ERR_MAX_IN_RATIO\");\n\n        uint256 factoryFee = bmul(tokenAmountIn, bmul(bdiv(_swapFee, 6), 1));\n\n        uint spotPriceBefore = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceBefore \u003c= maxPrice, \"ERR_BAD_LIMIT_PRICE\");\n\n        tokenAmountOut = calcOutGivenIn(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            tokenAmountIn,\n            _swapFee\n        );\n        require(tokenAmountOut \u003e= minAmountOut, \"ERR_LIMIT_OUT\");\n\n        uint inAfterFee = bsub(tokenAmountIn, factoryFee);\n        inRecord.balance = badd(inRecord.balance, inAfterFee);\n        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);\n\n        spotPriceAfter = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceAfter \u003e= spotPriceBefore, \"ERR_MATH_APPROX\");\n        require(spotPriceAfter \u003c= maxPrice, \"ERR_LIMIT_PRICE\");\n        require(spotPriceBefore \u003c= bdiv(tokenAmountIn, tokenAmountOut), \"ERR_MATH_APPROX\");\n\n        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        _pushUnderlying(tokenOut, to, tokenAmountOut);\n        _pushUnderlying(tokenIn, _factory.getFeeTo(), factoryFee);\n\n        _swapMining(user, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        return (tokenAmountOut, spotPriceAfter);\n    }\n\n    function swapExactAmountOut(\n        address user,\n        address tokenIn,\n        uint maxAmountIn,\n        address tokenOut,\n        uint tokenAmountOut,\n        address to,\n        uint maxPrice\n    )\n    external\n    _lock_\n    returns (uint tokenAmountIn, uint spotPriceAfter)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        require(_publicSwap, \"ERR_SWAP_NOT_PUBLIC\");\n\n        Record storage inRecord = _records[address(tokenIn)];\n        Record storage outRecord = _records[address(tokenOut)];\n\n        require(tokenAmountOut \u003c= bmul(outRecord.balance, MAX_OUT_RATIO), \"ERR_MAX_OUT_RATIO\");\n\n        uint spotPriceBefore = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceBefore \u003c= maxPrice, \"ERR_BAD_LIMIT_PRICE\");\n\n        tokenAmountIn = calcInGivenOut(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            tokenAmountOut,\n            _swapFee\n        );\n        uint user_deposit_amount = bsub(IERC20(tokenIn).balanceOf(address(this)), inRecord.balance);\n        require(tokenAmountIn == user_deposit_amount \u0026\u0026 user_deposit_amount \u003c= maxAmountIn, \"ERR_LIMIT_IN\");\n\n        uint256 factoryFee = bmul(tokenAmountIn, bmul(bdiv(_swapFee, 6), 1));\n\n        inRecord.balance = badd(inRecord.balance, bsub(tokenAmountIn, factoryFee));\n        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);\n\n        spotPriceAfter = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceAfter \u003e= spotPriceBefore, \"ERR_MATH_APPROX\");\n        require(spotPriceAfter \u003c= maxPrice, \"ERR_LIMIT_PRICE\");\n        require(spotPriceBefore \u003c= bdiv(tokenAmountIn, tokenAmountOut), \"ERR_MATH_APPROX\");\n\n        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        _pushUnderlying(tokenOut, to, tokenAmountOut);\n        _pushUnderlying(tokenIn, _factory.getFeeTo(), factoryFee);\n\n        _swapMining(user, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n        return (tokenAmountIn, spotPriceAfter);\n    }\n\n    function calcDesireByGivenAmount(address tokenIn, address tokenOut, uint256 inAmount, uint256 outAmount)\n    external view\n    returns (uint desireAmount)\n    {\n        require(inAmount != 0 || outAmount != 0, \"ERR_AMOUNT_IS_ZERO\");\n        Record memory inRecord = _records[address(tokenIn)];\n        Record memory outRecord = _records[address(tokenOut)];\n        if (inAmount != 0) {\n            desireAmount = calcOutGivenIn(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, inAmount, _swapFee);\n        } else {\n            desireAmount = calcInGivenOut(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, outAmount, _swapFee);\n        }\n    }\n    function calcPoolSpotPrice(address tokenIn, address tokenOut, uint256 inAmount, uint256 outAmount)\n    external view\n    returns (uint256 price)\n    {\n        Record memory inRecord = _records[address(tokenIn)];\n        Record memory outRecord = _records[address(tokenOut)];\n        if (inAmount != 0 \u0026\u0026 outAmount != 0) {\n            uint256 factoryFee = bmul(inAmount, bmul(bdiv(_swapFee, 6), 1));\n            price = calcSpotPrice(\n                badd(inRecord.balance, bsub(inAmount, factoryFee)),\n                inRecord.denorm,\n                bsub(outRecord.balance, outAmount),\n                outRecord.denorm,\n                _swapFee);\n        } else {\n            price = calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, _swapFee);\n        }\n    }\n\n    function updatePairGPInfo(address[] calldata gps, uint[] calldata shares)\n    external\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        if (address(_pair) != address(0))\n        {\n            _pair.updateGPInfo(gps, shares);\n        }\n    }\n\n    // \u0027Underlying\u0027 token-manipulation functions make external calls but are NOT locked\n    // You must `_lock_` or otherwise ensure reentry-safety\n\n    function _pullUnderlying(address erc20, address from, uint amount)\n    internal\n    {\n        safeTransferFrom(erc20, from, address(this), amount);\n    }\n\n    function _pushUnderlying(address erc20, address to, uint amount)\n    internal\n    {\n        safeTransfer(erc20, to, amount);\n    }\n\n    function _pullPoolShare(address from, uint amount)\n    internal\n    {\n        _pull(from, amount);\n    }\n\n    function _pushPoolShare(address to, uint amount)\n    internal\n    {\n        _push(to, amount);\n    }\n\n    function _mintPoolShare(uint amount)\n    internal\n    {\n        _mint(amount);\n    }\n\n    function _burnPoolShare(uint amount)\n    internal\n    {\n        _burn(amount);\n    }\n\n    function _lpChanging(bool add, address user, uint256 amount)\n    internal\n    {\n        if (address(_pair) != address(0))\n        {\n            add == true ? _pair.addLiquidity(false, user, amount) : _pair.removeLiquidity(false, user, amount);\n        }\n\n        (address lpMiningAdr, ) = _factory.getMining();\n        if (lpMiningAdr != address(0))\n        {\n            IMining mining = IMining(lpMiningAdr);\n            uint256[] memory balances = new uint256[](_tokens.length);\n            uint256[] memory weights = new uint256[](_tokens.length);\n            for (uint i = 0; i \u003c _tokens.length; i++) {\n                balances[i] = _records[_tokens[i]].balance;\n                weights[i] = bdiv(_records[_tokens[i]].denorm, _totalWeight);\n            }\n\n            mining.claimLiquidityShares(user, _tokens, balances, weights, amount, add);\n        }\n\n    }\n\n    function _swapMining(address user, address tokenIn, address tokenOut, uint256 tokenAmountIn, uint256 tokenAmountOut)\n    internal\n    {\n        ( ,address swapMiningAdr) = _factory.getMining();\n        if (swapMiningAdr != address(0)){\n            IMining mining = IMining(swapMiningAdr);\n            mining.claimSwapShare(user, tokenIn, tokenAmountIn, tokenOut, tokenAmountOut);\n        }\n    }\n\n    function _transferLiquidity(address src, address dst, uint amt) internal {\n        (address lpMiningAdr, ) = _factory.getMining();\n        if (lpMiningAdr != address(0)){\n            IMining mining = IMining(lpMiningAdr);\n            mining.onTransferLiquidity(src, dst, amt);\n        }\n    }\n\n    function transfer(address dst, uint amt) external returns (bool) {\n        require(_factory.isWhiteList(msg.sender) || _factory.isWhiteList(dst), \"ERR_NOT_WHITELIST\");\n        _move(msg.sender, dst, amt);\n        if(dst != address(this)){\n            _transferLiquidity(msg.sender, dst, amt);\n        }\n        return true;\n    }\n\n    function transferFrom(address src, address dst, uint amt) external returns (bool) {\n        require(_factory.isWhiteList(msg.sender) || _factory.isWhiteList(dst), \"ERR_NOT_WHITELIST\");\n        require(msg.sender == src || amt \u003c= _allowance[src][msg.sender], \"ERR_BTOKEN_BAD_CALLER\");\n        _move(src, dst, amt);\n        if (msg.sender != src \u0026\u0026 _allowance[src][msg.sender] != uint256(-1)) {\n            _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);\n            emit Approval(msg.sender, dst, _allowance[src][msg.sender]);\n        }\n        if(dst != address(this)){\n            _transferLiquidity(src, dst, amt);\n        }\n        return true;\n    }\n\n    function bindPair(\n        IPairFactory pairFactory,\n        address[] calldata gps,\n        uint[] calldata shares,\n        uint gpRate\n    ) external {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        IPairToken pair = pairFactory.newPair(address(this), 4 * 10 ** 18, gpRate);\n        _setPair(IMining(address(pair)));\n        if (gpRate \u003e 0 \u0026\u0026 gpRate \u003c= 15 \u0026\u0026 gps.length != 0 \u0026\u0026 gps.length == shares.length) {\n            _pair.updateGPInfo(gps, shares);\n        }\n        pair.setController(msg.sender);\n    }\n}\n"},"MToken.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MNum.sol\";\n\n// Highly opinionated token implementation\n\ninterface IERC20 {\n    event Approval(address indexed src, address indexed dst, uint amt);\n    event Transfer(address indexed src, address indexed dst, uint amt);\n\n    function totalSupply() external view returns (uint);\n    function balanceOf(address whom) external view returns (uint);\n    function allowance(address src, address dst) external view returns (uint);\n\n    function approve(address dst, uint amt) external returns (bool);\n    function transfer(address dst, uint amt) external returns (bool);\n    function transferFrom(address src, address dst, uint amt) external returns (bool);\n}\n\ncontract MTokenBase is MNum {\n\n    mapping(address =\u003e uint)                   internal _balance;\n    mapping(address =\u003e mapping(address=\u003euint)) internal _allowance;\n    uint internal _totalSupply;\n\n    event Approval(address indexed src, address indexed dst, uint amt);\n    event Transfer(address indexed src, address indexed dst, uint amt);\n\n    function _mint(uint amt) internal {\n        _balance[address(this)] = badd(_balance[address(this)], amt);\n        _totalSupply = badd(_totalSupply, amt);\n        emit Transfer(address(0), address(this), amt);\n    }\n\n    function _burn(uint amt) internal {\n        require(_balance[address(this)] \u003e= amt, \"ERR_INSUFFICIENT_BAL\");\n        _balance[address(this)] = bsub(_balance[address(this)], amt);\n        _totalSupply = bsub(_totalSupply, amt);\n        emit Transfer(address(this), address(0), amt);\n    }\n\n    function _move(address src, address dst, uint amt) internal {\n        require(_balance[src] \u003e= amt, \"ERR_INSUFFICIENT_BAL\");\n        _balance[src] = bsub(_balance[src], amt);\n        _balance[dst] = badd(_balance[dst], amt);\n        emit Transfer(src, dst, amt);\n    }\n\n    function _push(address to, uint amt) internal {\n        _move(address(this), to, amt);\n    }\n\n    function _pull(address from, uint amt) internal {\n        _move(from, address(this), amt);\n    }\n}\n\ncontract MToken is MTokenBase, IERC20 {\n\n    string  private _name     = \"Mercurity Pool Token\";\n    string  private _symbol   = \"MPT\";\n    uint8   private _decimals = 18;\n\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    function symbol() public view returns (string memory) {\n        return _symbol;\n    }\n\n    function decimals() public view returns(uint8) {\n        return _decimals;\n    }\n\n    function allowance(address src, address dst) external view returns (uint) {\n        return _allowance[src][dst];\n    }\n\n    function balanceOf(address whom) external view returns (uint) {\n        return _balance[whom];\n    }\n\n    function totalSupply() public view returns (uint) {\n        return _totalSupply;\n    }\n\n    function approve(address dst, uint amt) external returns (bool) {\n        _allowance[msg.sender][dst] = amt;\n        emit Approval(msg.sender, dst, amt);\n        return true;\n    }\n\n    function increaseApproval(address dst, uint amt) external returns (bool) {\n        _allowance[msg.sender][dst] = badd(_allowance[msg.sender][dst], amt);\n        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n        return true;\n    }\n\n    function decreaseApproval(address dst, uint amt) external returns (bool) {\n        uint oldValue = _allowance[msg.sender][dst];\n        if (amt \u003e oldValue) {\n            _allowance[msg.sender][dst] = 0;\n        } else {\n            _allowance[msg.sender][dst] = bsub(oldValue, amt);\n        }\n        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n        return true;\n    }\n\n    function transfer(address dst, uint amt) external returns (bool) {\n        _move(msg.sender, dst, amt);\n        return true;\n    }\n\n    function transferFrom(address src, address dst, uint amt) external returns (bool) {\n        require(msg.sender == src || amt \u003c= _allowance[src][msg.sender], \"ERR_BTOKEN_BAD_CALLER\");\n        _move(src, dst, amt);\n        if (msg.sender != src \u0026\u0026 _allowance[src][msg.sender] != uint256(-1)) {\n            _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);\n            emit Approval(msg.sender, dst, _allowance[src][msg.sender]);\n        }\n        return true;\n    }\n\n    function safeTransfer(\n        address token,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027transfer(address,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));\n        require(\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::safeTransfer: transfer failed\u0027\n        );\n    }\n\n    function safeTransferFrom(\n        address token,\n        address from,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027transferFrom(address,address,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));\n        require(\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::transferFrom: transferFrom failed\u0027\n        );\n    }\n}\n"}}

{"ERC20Token.sol":{"content":"//SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.6.12;\n\n/*\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with GSN meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n    function _msgSender() internal view virtual returns (address payable) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes memory) {\n        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n        return msg.data;\n    }\n}\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\ncontract Ownable is Context {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    constructor () internal {\n        address msgSender = _msgSender();\n        _owner = msgSender;\n        emit OwnershipTransferred(address(0), msgSender);\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        require(_owner == _msgSender(), \"Ownable: caller is not the owner\");\n        _;\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        emit OwnershipTransferred(_owner, address(0));\n        _owner = address(0);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        emit OwnershipTransferred(_owner, newOwner);\n        _owner = newOwner;\n    }\n}\n\n/**\n * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it\u0027s recommended to use it always.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        require(c \u003e= a, \"SafeMath: addition overflow\");\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        return sub(a, b, \"SafeMath: subtraction overflow\");\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity\u0027s `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003c= a, errorMessage);\n        uint256 c = a - b;\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the multiplication of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity\u0027s `*` operator.\n     *\n     * Requirements:\n     *\n     * - Multiplication cannot overflow.\n     */\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\n        // benefit is lost if \u0027b\u0027 is also tested.\n        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n        if (a == 0) {\n            return 0;\n        }\n\n        uint256 c = a * b;\n        require(c / a == b, \"SafeMath: multiplication overflow\");\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers. Reverts on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b) internal pure returns (uint256) {\n        return div(a, b, \"SafeMath: division by zero\");\n    }\n\n    /**\n     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\n     * division by zero. The result is rounded towards zero.\n     *\n     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\n     * `revert` opcode (which leaves remaining gas untouched) while Solidity\n     * uses an invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b \u003e 0, errorMessage);\n        uint256 c = a / b;\n        // assert(a == b * c + a % b); // There is no case in which this doesn\u0027t hold\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * Reverts when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n        return mod(a, b, \"SafeMath: modulo by zero\");\n    }\n\n    /**\n     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n     * Reverts with custom message when dividing by zero.\n     *\n     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\n     * opcode (which leaves remaining gas untouched) while Solidity uses an\n     * invalid opcode to revert (consuming all remaining gas).\n     *\n     * Requirements:\n     *\n     * - The divisor cannot be zero.\n     */\n    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n        require(b != 0, errorMessage);\n        return a % b;\n    }\n}\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller\u0027s account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller\u0027s tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender\u0027s allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller\u0027s\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n\ninterface IERC20Token is IERC20 {\n    function maxSupply() external view returns (uint256);\n    function issue(address account, uint256 amount) external returns (bool);\n    function burn(uint256 amount) external returns (bool);\n}\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies in extcodesize, which returns 0 for contracts in\n        // construction, since the code is only stored at the end of the\n        // constructor execution.\n\n        uint256 size;\n        // solhint-disable-next-line no-inline-assembly\n        assembly { size := extcodesize(account) }\n        return size \u003e 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance \u003e= amount, \"Address: insufficient balance\");\n\n        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\n        (bool success, ) = recipient.call{ value: amount }(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain`call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n      return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\n        return _functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\n        require(address(this).balance \u003e= value, \"Address: insufficient balance for call\");\n        return _functionCallWithValue(target, data, value, errorMessage);\n    }\n\n    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {\n        require(isContract(target), \"Address: call to non-contract\");\n\n        // solhint-disable-next-line avoid-low-level-calls\n        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length \u003e 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                // solhint-disable-next-line no-inline-assembly\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    using SafeMath for uint256;\n    using Address for address;\n\n    function safeTransfer(IERC20 token, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Deprecated. This function has issues similar to the ones found in\n     * {IERC20-approve}, and its usage is discouraged.\n     *\n     * Whenever possible, use {safeIncreaseAllowance} and\n     * {safeDecreaseAllowance} instead.\n     */\n    function safeApprove(IERC20 token, address spender, uint256 value) internal {\n        // safeApprove should only be called when setting an initial allowance,\n        // or when resetting it to zero. To increase and decrease it, use\n        // \u0027safeIncreaseAllowance\u0027 and \u0027safeDecreaseAllowance\u0027\n        // solhint-disable-next-line max-line-length\n        require((value == 0) || (token.allowance(address(this), spender) == 0),\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\n        );\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n    }\n\n    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).add(value);\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n        uint256 newAllowance = token.allowance(address(this), spender).sub(value, \"SafeERC20: decreased allowance below zero\");\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     * @param token The token targeted by the call.\n     * @param data The call data (encoded using abi.encode or one of its variants).\n     */\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity\u0027s return data size checking mechanism, since\n        // we\u0027re implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n        // the target address contains contract code and also asserts for success in the low-level call.\n\n        bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n        if (returndata.length \u003e 0) { // Return data is optional\n            // solhint-disable-next-line max-line-length\n            require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n        }\n    }\n}\n\ncontract ERC20Token is IERC20Token, Ownable {\n\n    using SafeMath for uint256;\n\n    mapping(address =\u003e uint256) internal _balances;\n    mapping(address =\u003e mapping(address =\u003e uint256)) internal _allowances;\n    uint256 internal _totalSupply;\n    string internal _name;\n    string internal _symbol;\n    uint8 internal _decimals;\n    uint256 internal _maxSupply;\n\n    mapping(address =\u003e bool) internal issuer;\n\n    modifier onlyIssuer() {\n        require(issuer[msg.sender], \"The caller does not have issuer role privileges\");\n        _;\n    }\n\n    constructor (string memory name, string memory sym, uint256 maxSupply) public {\n        _name = name;\n        _symbol = sym;\n        _decimals = 18;\n        if (maxSupply == 0) {\n            _maxSupply = uint256(- 1);\n        } else {\n            _maxSupply = maxSupply;\n        }\n\n        issuer[msg.sender] = true;\n    }\n\n\n    function isOwner() public view returns (bool) {\n        return msg.sender == owner();\n    }\n\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    function symbol() external view returns (string memory) {\n        return _symbol;\n    }\n\n    function decimals() external view returns (uint8) {\n        return _decimals;\n    }\n\n    function totalSupply() external override view returns (uint256) {\n        return _totalSupply;\n    }\n\n    function balanceOf(address account) public override view returns (uint256) {\n        return _balances[account];\n    }\n\n    function maxSupply() override external view returns (uint256) {\n        return _maxSupply;\n    }\n\n    function transfer(address recipient, uint256 amount) external override returns (bool) {\n        _transfer(msg.sender, recipient, amount);\n        return true;\n    }\n\n    function allowance(address _owner, address spender) external override view returns (uint256) {\n        return _allowances[_owner][spender];\n    }\n\n    function approve(address spender, uint256 value) external override returns (bool) {\n        _approve(msg.sender, spender, value);\n        return true;\n    }\n\n    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {\n        _transfer(sender, recipient, amount);\n        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));\n        return true;\n    }\n\n    function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {\n        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));\n        return true;\n    }\n\n    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {\n        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));\n        return true;\n    }\n\n    function issue(address account, uint256 amount) override external onlyIssuer returns (bool) {\n        _mint(account, amount);\n        return true;\n    }\n\n    // only burn self token\n    function burn(uint256 amount) override external returns (bool) {\n        _burn(msg.sender, amount);\n        return true;\n    }\n\n    function addIssuer(address _addr) public onlyOwner returns (bool){\n        require(_addr != address(0), \"address invalid\");\n        if (issuer[_addr] == false) {\n            issuer[_addr] = true;\n            return true;\n        }\n        return false;\n    }\n\n    function removeIssuer(address _addr) public onlyOwner returns (bool) {\n        require(_addr != address(0), \"address invalid\");\n        if (issuer[_addr] == true) {\n            issuer[_addr] = false;\n            return true;\n        }\n        return false;\n    }\n\n    function _transfer(address sender, address recipient, uint256 amount) internal {\n        require(sender != address(0), \"ERC20: transfer from the zero address\");\n        require(recipient != address(0), \"ERC20: transfer to the zero address\");\n\n        _balances[sender] = _balances[sender].sub(amount);\n        _balances[recipient] = _balances[recipient].add(amount);\n        emit Transfer(sender, recipient, amount);\n    }\n\n    function _mint(address account, uint256 amount) internal {\n        require(account != address(0), \"ERC20: mint to the zero address\");\n        _totalSupply = _totalSupply.add(amount);\n        require(_totalSupply \u003c= _maxSupply, \"ERC20: supply amount cannot over maxSupply\");\n        _balances[account] = _balances[account].add(amount);\n        emit Transfer(address(0), account, amount);\n    }\n\n    function _burn(address account, uint256 value) internal {\n        require(account != address(0), \"ERC20: burn from the zero address\");\n\n        _totalSupply = _totalSupply.sub(value);\n        _balances[account] = _balances[account].sub(value);\n        emit Transfer(account, address(0), value);\n    }\n\n    function _approve(address _owner, address spender, uint256 value) internal {\n        require(_owner != address(0), \"ERC20: approve from the zero address\");\n        require(spender != address(0), \"ERC20: approve to the zero address\");\n\n        _allowances[_owner][spender] = value;\n        emit Approval(_owner, spender, value);\n    }\n\n    function _burnFrom(address account, uint256 amount) internal {\n        _burn(account, amount);\n        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));\n    }\n}\n"},"GovernTokenV1.sol":{"content":"//SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.6.12;\n\nimport \"./ERC20Token.sol\";\n\ninterface ITokenVotorV1 {\n    function delegates(address delegator) external view returns (address);\n    function delegate(address delegatee) external;\n    function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) external;\n    function getCurrentVotes(address account) external view returns (uint256);\n    function getPriorVotes(address account, uint blockNumber) external view returns (uint256);\n}\n\ncontract GovernTokenV1 is ERC20Token, ITokenVotorV1 {\n\n    // A record of each accounts delegates\n    mapping(address =\u003e address) internal _delegates;\n\n    // A checkpoint for marking number of votes from a given block\n    struct Checkpoint {\n        uint32 fromBlock;\n        uint256 votes;\n    }\n\n    // A record of votes checkpoints for each account, by index\n    mapping(address =\u003e mapping(uint32 =\u003e Checkpoint)) public checkpoints;\n\n    // The number of checkpoints for each account\n    mapping(address =\u003e uint32) public numCheckpoints;\n\n    // The EIP-712 typehash for the contract\u0027s domain\n    bytes32 public constant DOMAIN_TYPEHASH = keccak256(\"EIP712Domain(string name,uint256 chainId,address verifyingContract)\");\n\n    // The EIP-712 typehash for the delegation struct used by the contract\n    bytes32 public constant DELEGATION_TYPEHASH = keccak256(\"Delegation(address delegatee,uint256 nonce,uint256 expiry)\");\n\n    // A record of states for signing / validating signatures\n    mapping(address =\u003e uint) public nonces;\n\n    // An event thats emitted when an account changes its delegate\n    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);\n\n    // An event thats emitted when a delegate account\u0027s vote balance changes\n    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);\n\n    constructor(string memory name, string memory sym, uint256 maxSupply) ERC20Token(name, sym, maxSupply) public {}\n\n    /**\n     * @notice Delegate votes from `msg.sender` to `delegatee`\n     * @param delegator The address to get delegatee for\n     */\n    function delegates(address delegator)\n    override\n    external\n    view\n    returns (address)\n    {\n        return _delegates[delegator];\n    }\n\n    /**\n     * @notice Delegate votes from `msg.sender` to `delegatee`\n     * @param delegatee The address to delegate votes to\n     */\n    function delegate(address delegatee) override external {\n        return _delegate(msg.sender, delegatee);\n    }\n\n    /**\n     * @notice Delegates votes from signatory to `delegatee`\n     * @param delegatee The address to delegate votes to\n     * @param nonce The contract state required to match the signature\n     * @param expiry The time at which to expire the signature\n     * @param v The recovery byte of the signature\n     * @param r Half of the ECDSA signature pair\n     * @param s Half of the ECDSA signature pair\n     */\n    function delegateBySig(\n        address delegatee,\n        uint nonce,\n        uint expiry,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    )\n    override\n    external\n    {\n        bytes32 domainSeparator = keccak256(\n            abi.encode(\n                DOMAIN_TYPEHASH,\n                keccak256(bytes(name())),\n                getChainId(),\n                address(this)\n            )\n        );\n\n        bytes32 structHash = keccak256(\n            abi.encode(\n                DELEGATION_TYPEHASH,\n                delegatee,\n                nonce,\n                expiry\n            )\n        );\n\n        bytes32 digest = keccak256(\n            abi.encodePacked(\n                \"\\x19\\x01\",\n                domainSeparator,\n                structHash\n            )\n        );\n\n        address signatory = ecrecover(digest, v, r, s);\n        require(signatory != address(0), \"GovernTokenV1::delegateBySig: invalid signature\");\n        require(nonce == nonces[signatory]++, \"GovernTokenV1::delegateBySig: invalid nonce\");\n        require(now \u003c= expiry, \"GovernTokenV1::delegateBySig: signature expired\");\n        return _delegate(signatory, delegatee);\n    }\n\n    /**\n     * @notice Gets the current votes balance for `account`\n     * @param account The address to get votes balance\n     * @return The number of current votes for `account`\n     */\n    function getCurrentVotes(address account)\n    override\n    external\n    view\n    returns (uint256)\n    {\n        uint32 nCheckpoints = numCheckpoints[account];\n        return nCheckpoints \u003e 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;\n    }\n\n    /**\n     * @notice Determine the prior number of votes for an account as of a block number\n     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.\n     * @param account The address of the account to check\n     * @param blockNumber The block number to get the vote balance at\n     * @return The number of votes the account had as of the given block\n     */\n    function getPriorVotes(address account, uint blockNumber)\n    override\n    external\n    view\n    returns (uint256)\n    {\n        require(blockNumber \u003c block.number, \"GovernTokenV1::getPriorVotes: not yet determined\");\n\n        uint32 nCheckpoints = numCheckpoints[account];\n        if (nCheckpoints == 0) {\n            return 0;\n        }\n\n        // First check most recent balance\n        if (checkpoints[account][nCheckpoints - 1].fromBlock \u003c= blockNumber) {\n            return checkpoints[account][nCheckpoints - 1].votes;\n        }\n\n        // Next check implicit zero balance\n        if (checkpoints[account][0].fromBlock \u003e blockNumber) {\n            return 0;\n        }\n\n        uint32 lower = 0;\n        uint32 upper = nCheckpoints - 1;\n        while (upper \u003e lower) {\n            uint32 center = upper - (upper - lower) / 2;\n            // ceil, avoiding overflow\n            Checkpoint memory cp = checkpoints[account][center];\n            if (cp.fromBlock == blockNumber) {\n                return cp.votes;\n            } else if (cp.fromBlock \u003c blockNumber) {\n                lower = center;\n            } else {\n                upper = center - 1;\n            }\n        }\n        return checkpoints[account][lower].votes;\n    }\n\n    function _delegate(address delegator, address delegatee)\n    internal\n    {\n        address currentDelegate = _delegates[delegator];\n        uint256 delegatorBalance = balanceOf(delegator);\n        // balance of underlying SUSHIs (not scaled);\n        _delegates[delegator] = delegatee;\n\n        emit DelegateChanged(delegator, currentDelegate, delegatee);\n\n        _moveDelegates(currentDelegate, delegatee, delegatorBalance);\n    }\n\n    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {\n        if (srcRep != dstRep \u0026\u0026 amount \u003e 0) {\n            if (srcRep != address(0)) {\n                // decrease old representative\n                uint32 srcRepNum = numCheckpoints[srcRep];\n                uint256 srcRepOld = srcRepNum \u003e 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;\n                uint256 srcRepNew = srcRepOld.sub(amount);\n                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);\n            }\n\n            if (dstRep != address(0)) {\n                // increase new representative\n                uint32 dstRepNum = numCheckpoints[dstRep];\n                uint256 dstRepOld = dstRepNum \u003e 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;\n                uint256 dstRepNew = dstRepOld.add(amount);\n                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);\n            }\n        }\n    }\n\n    function _writeCheckpoint(\n        address delegatee,\n        uint32 nCheckpoints,\n        uint256 oldVotes,\n        uint256 newVotes\n    )\n    internal\n    {\n        uint32 blockNumber = safe32(block.number, \"GovernTokenV1::_writeCheckpoint: block number exceeds 32 bits\");\n\n        if (nCheckpoints \u003e 0 \u0026\u0026 checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {\n            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;\n        } else {\n            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);\n            numCheckpoints[delegatee] = nCheckpoints + 1;\n        }\n\n        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);\n    }\n\n    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {\n        require(n \u003c 2 ** 32, errorMessage);\n        return uint32(n);\n    }\n\n    function getChainId() internal pure returns (uint) {\n        uint256 chainId;\n        assembly {chainId := chainid()}\n        return chainId;\n    }\n}\n"}}

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.4.18;

contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed src, address indexed guy, uint wad);
    event  Transfer(address indexed src, address indexed dst, uint wad);
    event  Deposit(address indexed dst, uint wad);
    event  Withdrawal(address indexed src, uint wad);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }
    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }
    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


/*
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otherwise be available to you under applicable patent law.

  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
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excuse you from the conditions of this License.  If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all.  For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.

  13. Use with the GNU Affero General Public License.

  Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
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License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

  Each version is given a distinguishing version number.  If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation.  If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
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to choose that version for the Program.

  Later license versions may give you additional or different
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  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

  16. Limitation of Liability.

  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
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DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

*/

{"MColor.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\ncontract MColor {\n    function getColor()\n    external view\n    returns (bytes32);\n}\n\ncontract MBronze is MColor {\n    function getColor()\n    external view\n    returns (bytes32) {\n        return bytes32(\"BRONZE\");\n    }\n}\n"},"MConst.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MColor.sol\";\n\ncontract MConst is MBronze {\n    uint internal constant BONE              = 10**18;\n\n    uint internal constant MIN_BOUND_TOKENS  = 2;\n    uint internal constant MAX_BOUND_TOKENS  = 8;\n\n    uint internal constant MIN_FEE           = BONE / 10**6;\n    uint internal constant MAX_FEE           = BONE / 10;\n\n    uint internal constant MIN_WEIGHT        = BONE;\n    uint internal constant MAX_WEIGHT        = BONE * 50;\n    uint internal constant MAX_TOTAL_WEIGHT  = BONE * 50;\n    uint internal constant MIN_BALANCE       = BONE / 10**12;\n\n    uint internal constant INIT_POOL_SUPPLY  = BONE * 100;\n\n    uint internal constant MIN_BPOW_BASE     = 1 wei;\n    uint internal constant MAX_BPOW_BASE     = (2 * BONE) - 1 wei;\n    uint internal constant BPOW_PRECISION    = BONE / 10**10;\n\n    uint internal constant MAX_IN_RATIO      = BONE / 2;\n    uint internal constant MAX_OUT_RATIO     = (BONE / 3) + 1 wei;\n}\n"},"MFactory.sol":{"content":"pragma solidity 0.5.12;\n\nimport \"./MPool.sol\";\n\ncontract MFactory is MBronze {\n    event LOG_NEW_POOL(\n        address indexed caller,\n        address indexed pool\n    );\n\n    address private _lpMining;\n    address private _swapMining;\n\n    mapping(address =\u003e bool) private _isMPool;\n    mapping(address =\u003e bool) private _isWhiteList;\n\n    function isMPool(address b)\n    external view returns (bool)\n    {\n        return _isMPool[b];\n    }\n\n    function isWhiteList(address w)\n    external view returns (bool)\n    {\n        return _isWhiteList[w];\n    }\n\n    function newMPool()\n    external\n    returns (MPool)\n    {\n        MPool mpool = new MPool();\n        _isMPool[address(mpool)] = true;\n        emit LOG_NEW_POOL(msg.sender, address(mpool));\n        mpool.setController(msg.sender);\n        return mpool;\n    }\n\n    address private _mlabs;\n    address public feeTo;\n\n    constructor() public {\n        _mlabs = msg.sender;\n    }\n\n    function getMLabs()\n    external view\n    returns (address)\n    {\n        return _mlabs;\n    }\n\n    function getFeeTo()\n    external view\n    returns (address)\n    {\n        return feeTo;\n    }\n\n    function setMLabs(address b)\n    external\n    {\n        require(msg.sender == _mlabs, \"ERR_NOT_BLABS\");\n        _mlabs = b;\n    }\n\n    function setFeeTo(address b)\n    external\n    {\n        require(msg.sender == _mlabs, \"ERR_NOT_BLABS\");\n        feeTo = b;\n    }\n\n    function updateWhiteList(address w, bool status)\n    external\n    {\n        require(msg.sender == _mlabs, \"ERR_NOT_MLABS\");\n        _isWhiteList[w] = status;\n    }\n\n    function getMining()\n    external view\n    returns (address lpMiningAdr, address swapMiningAdr)\n    {\n        return (_lpMining, _swapMining);\n    }\n\n    function setMining(address lpMining, address swapMining)\n    external\n    {\n        require(msg.sender == _mlabs, \"ERR_NOT_MLABS\");\n        _lpMining = lpMining;\n        _swapMining = swapMining;\n    }\n\n}"},"MMath.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MNum.sol\";\n\ncontract MMath is MBronze, MConst, MNum {\n    /**********************************************************************************************\n    // calcSpotPrice                                                                             //\n    // sP = spotPrice                                                                            //\n    // bI = tokenBalanceIn                ( bI / wI )         1                                  //\n    // bO = tokenBalanceOut         sP =  -----------  *  ----------                             //\n    // wI = tokenWeightIn                 ( bO / wO )     ( 1 - sF )                             //\n    // wO = tokenWeightOut                                                                       //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcSpotPrice(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint swapFee\n    )\n    public pure\n    returns (uint spotPrice)\n    {\n        uint numer = bdiv(tokenBalanceIn, tokenWeightIn);\n        uint denom = bdiv(tokenBalanceOut, tokenWeightOut);\n        uint ratio = bdiv(numer, denom);\n        uint scale = bdiv(BONE, bsub(BONE, swapFee));\n        return  (spotPrice = bmul(ratio, scale));\n    }\n\n    /**********************************************************************************************\n    // calcOutGivenIn                                                                            //\n    // aO = tokenAmountOut                                                                       //\n    // bO = tokenBalanceOut                                                                      //\n    // bI = tokenBalanceIn              /      /            bI             \\    (wI / wO) \\      //\n    // aI = tokenAmountIn    aO = bO * |  1 - | --------------------------  | ^            |     //\n    // wI = tokenWeightIn               \\      \\ ( bI + ( aI * ( 1 - sF )) /              /      //\n    // wO = tokenWeightOut                                                                       //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcOutGivenIn(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint tokenAmountIn,\n        uint swapFee\n    )\n    public pure\n    returns (uint tokenAmountOut)\n    {\n        uint weightRatio = bdiv(tokenWeightIn, tokenWeightOut);\n        uint adjustedIn = bsub(BONE, swapFee);\n        adjustedIn = bmul(tokenAmountIn, adjustedIn);\n        uint y = bdiv(tokenBalanceIn, badd(tokenBalanceIn, adjustedIn));\n        uint foo = bpow(y, weightRatio);\n        uint bar = bsub(BONE, foo);\n        tokenAmountOut = bmul(tokenBalanceOut, bar);\n        return tokenAmountOut;\n    }\n\n    /**********************************************************************************************\n    // calcInGivenOut                                                                            //\n    // aI = tokenAmountIn                                                                        //\n    // bO = tokenBalanceOut               /  /     bO      \\    (wO / wI)      \\                 //\n    // bI = tokenBalanceIn          bI * |  | ------------  | ^            - 1  |                //\n    // aO = tokenAmountOut    aI =        \\  \\ ( bO - aO ) /                   /                 //\n    // wI = tokenWeightIn           --------------------------------------------                 //\n    // wO = tokenWeightOut                          ( 1 - sF )                                   //\n    // sF = swapFee                                                                              //\n    **********************************************************************************************/\n    function calcInGivenOut(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint tokenAmountOut,\n        uint swapFee\n    )\n    public pure\n    returns (uint tokenAmountIn)\n    {\n        uint weightRatio = bdiv(tokenWeightOut, tokenWeightIn);\n        uint diff = bsub(tokenBalanceOut, tokenAmountOut);\n        uint y = bdiv(tokenBalanceOut, diff);\n        uint foo = bpow(y, weightRatio);\n        foo = bsub(foo, BONE);\n        tokenAmountIn = bsub(BONE, swapFee);\n        tokenAmountIn = bdiv(bmul(tokenBalanceIn, foo), tokenAmountIn);\n        return tokenAmountIn;\n    }\n\n    /**********************************************************************************************\n    // calcPoolOutGivenSingleIn                                                                  //\n    // pAo = poolAmountOut         /                                              \\              //\n    // tAi = tokenAmountIn        ///      /     //    wI \\      \\\\       \\     wI \\             //\n    // wI = tokenWeightIn        //| tAi *| 1 - || 1 - --  | * sF || + tBi \\    --  \\            //\n    // tW = totalWeight     pAo=||  \\      \\     \\\\    tW /      //         | ^ tW   | * pS - pS //\n    // tBi = tokenBalanceIn      \\\\  ------------------------------------- /        /            //\n    // pS = poolSupply            \\\\                    tBi               /        /             //\n    // sF = swapFee                \\                                              /              //\n    **********************************************************************************************/\n    function calcPoolOutGivenSingleIn(\n        uint tokenBalanceIn,\n        uint tokenWeightIn,\n        uint poolSupply,\n        uint totalWeight,\n        uint tokenAmountIn,\n        uint swapFee\n    )\n    internal pure\n    returns (uint poolAmountOut)\n    {\n        // Charge the trading fee for the proportion of tokenAi\n        ///  which is implicitly traded to the other pool tokens.\n        // That proportion is (1- weightTokenIn)\n        // tokenAiAfterFee = tAi * (1 - (1-weightTi) * poolFee);\n        uint normalizedWeight = bdiv(tokenWeightIn, totalWeight);\n        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee);\n        uint tokenAmountInAfterFee = bmul(tokenAmountIn, bsub(BONE, zaz));\n\n        uint newTokenBalanceIn = badd(tokenBalanceIn, tokenAmountInAfterFee);\n        uint tokenInRatio = bdiv(newTokenBalanceIn, tokenBalanceIn);\n\n        // uint newPoolSupply = (ratioTi ^ weightTi) * poolSupply;\n        uint poolRatio = bpow(tokenInRatio, normalizedWeight);\n        uint newPoolSupply = bmul(poolRatio, poolSupply);\n        poolAmountOut = bsub(newPoolSupply, poolSupply);\n        return poolAmountOut;\n    }\n\n    /**********************************************************************************************\n    // calcSingleOutGivenPoolIn                                                                  //\n    // tAo = tokenAmountOut            /      /                                             \\\\   //\n    // bO = tokenBalanceOut           /      //        pS - pAi       \\     /    1    \\      \\\\  //\n    // pAi = poolAmountIn            | bO - || ----------------------- | ^ | --------- | * b0 || //\n    // ps = poolSupply                \\      \\\\          pS           /     \\(wO / tW)/      //  //\n    // wI = tokenWeightIn      tAo =   \\      \\                                             //   //\n    // tW = totalWeight                    /     /      wO \\       \\                             //\n    // sF = swapFee                    *  | 1 - |  1 - ---- | * sF  |                            //\n    // eF = exitFee                        \\     \\      tW /       /                             //\n    **********************************************************************************************/\n    function calcSingleOutGivenPoolIn(\n        uint tokenBalanceOut,\n        uint tokenWeightOut,\n        uint poolSupply,\n        uint totalWeight,\n        uint poolAmountIn,\n        uint swapFee\n    )\n    internal pure\n    returns (uint tokenAmountOut)\n    {\n        uint normalizedWeight = bdiv(tokenWeightOut, totalWeight);\n        // charge exit fee on the pool token side\n        // pAiAfterExitFee = pAi*(1-exitFee)\n        uint poolAmountInAfterExitFee = bmul(poolAmountIn, BONE);\n        uint newPoolSupply = bsub(poolSupply, poolAmountInAfterExitFee);\n        uint poolRatio = bdiv(newPoolSupply, poolSupply);\n\n        // newBalTo = poolRatio^(1/weightTo) * balTo;\n        uint tokenOutRatio = bpow(poolRatio, bdiv(BONE, normalizedWeight));\n        uint newTokenBalanceOut = bmul(tokenOutRatio, tokenBalanceOut);\n\n        uint tokenAmountOutBeforeSwapFee = bsub(tokenBalanceOut, newTokenBalanceOut);\n\n        // charge swap fee on the output token side\n        //uint tAo = tAoBeforeSwapFee * (1 - (1-weightTo) * swapFee)\n        uint zaz = bmul(bsub(BONE, normalizedWeight), swapFee);\n        tokenAmountOut = bmul(tokenAmountOutBeforeSwapFee, bsub(BONE, zaz));\n        return tokenAmountOut;\n    }\n\n}\n"},"MNum.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MConst.sol\";\n\ncontract MNum is MConst {\n\n    function btoi(uint a)\n    internal pure\n    returns (uint)\n    {\n        return a / BONE;\n    }\n\n    function bfloor(uint a)\n    internal pure\n    returns (uint)\n    {\n        return btoi(a) * BONE;\n    }\n\n    function badd(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        uint c = a + b;\n        require(c \u003e= a, \"ERR_ADD_OVERFLOW\");\n        return c;\n    }\n\n    function bsub(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        (uint c, bool flag) = bsubSign(a, b);\n        require(!flag, \"ERR_SUB_UNDERFLOW\");\n        return c;\n    }\n\n    function bsubSign(uint a, uint b)\n    internal pure\n    returns (uint, bool)\n    {\n        if (a \u003e= b) {\n            return (a - b, false);\n        } else {\n            return (b - a, true);\n        }\n    }\n\n    function bmul(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        uint c0 = a * b;\n        require(a == 0 || c0 / a == b, \"ERR_MUL_OVERFLOW\");\n        uint c1 = c0 + (BONE / 2);\n        require(c1 \u003e= c0, \"ERR_MUL_OVERFLOW\");\n        uint c2 = c1 / BONE;\n        return c2;\n    }\n\n    function bdiv(uint a, uint b)\n    internal pure\n    returns (uint)\n    {\n        require(b != 0, \"ERR_DIV_ZERO\");\n        uint c0 = a * BONE;\n        require(a == 0 || c0 / a == BONE, \"ERR_DIV_INTERNAL\"); // bmul overflow\n        uint c1 = c0 + (b / 2);\n        require(c1 \u003e= c0, \"ERR_DIV_INTERNAL\"); //  badd require\n        uint c2 = c1 / b;\n        return c2;\n    }\n\n    // DSMath.wpow\n    function bpowi(uint a, uint n)\n    internal pure\n    returns (uint)\n    {\n        uint z = n % 2 != 0 ? a : BONE;\n\n        for (n /= 2; n != 0; n /= 2) {\n            a = bmul(a, a);\n\n            if (n % 2 != 0) {\n                z = bmul(z, a);\n            }\n        }\n        return z;\n    }\n\n    // Compute b^(e.w) by splitting it into (b^e)*(b^0.w).\n    // Use `bpowi` for `b^e` and `bpowK` for k iterations\n    // of approximation of b^0.w\n    function bpow(uint base, uint exp)\n    internal pure\n    returns (uint)\n    {\n        require(base \u003e= MIN_BPOW_BASE, \"ERR_BPOW_BASE_TOO_LOW\");\n        require(base \u003c= MAX_BPOW_BASE, \"ERR_BPOW_BASE_TOO_HIGH\");\n\n        uint whole  = bfloor(exp);\n        uint remain = bsub(exp, whole);\n\n        uint wholePow = bpowi(base, btoi(whole));\n\n        if (remain == 0) {\n            return wholePow;\n        }\n\n        uint partialResult = bpowApprox(base, remain, BPOW_PRECISION);\n        return bmul(wholePow, partialResult);\n    }\n\n    function bpowApprox(uint base, uint exp, uint precision)\n    internal pure\n    returns (uint)\n    {\n        // term 0:\n        uint a     = exp;\n        (uint x, bool xneg)  = bsubSign(base, BONE);\n        uint term = BONE;\n        uint sum   = term;\n        bool negative = false;\n\n\n        // term(k) = numer / denom \n        //         = (product(a - i - 1, i=1--\u003ek) * x^k) / (k!)\n        // each iteration, multiply previous term by (a-(k-1)) * x / k\n        // continue until term is less than precision\n        for (uint i = 1; term \u003e= precision; i++) {\n            uint bigK = i * BONE;\n            (uint c, bool cneg) = bsubSign(a, bsub(bigK, BONE));\n            term = bmul(term, bmul(c, x));\n            term = bdiv(term, bigK);\n            if (term == 0) break;\n\n            if (xneg) negative = !negative;\n            if (cneg) negative = !negative;\n            if (negative) {\n                sum = bsub(sum, term);\n            } else {\n                sum = badd(sum, term);\n            }\n        }\n\n        return sum;\n    }\n\n}\n"},"MPool.sol":{"content":"pragma solidity 0.5.12;\n\nimport \"./MToken.sol\";\nimport \"./MMath.sol\";\n\ninterface IMFactory {\n    function isWhiteList(address w) external view returns (bool);\n    function getMining() external returns (address lpMiningAdr, address swapMiningAdr);\n    function getFeeTo() external view returns (address);\n}\n\ninterface IMining {\n    // pair\n    function addLiquidity(bool isGp, address _user, uint256 _amount) external;\n    function removeLiquidity(bool isGp, address _user, uint256 _amount) external;\n    function updateGPInfo(address[] calldata gps, uint256[] calldata amounts) external;\n    // lp mining\n    function onTransferLiquidity(address from, address to, uint256 lpAmount) external;\n    function claimLiquidityShares(address user, address[] calldata tokens, uint256[] calldata balances, uint256[] calldata weights, uint256 amount, bool _add) external;\n    // swap mining\n    function claimSwapShare(address user, address tokenIn, uint256 amountIn, address tokenOut, uint256 amountOut) external;\n}\n\ninterface IPairFactory {\n    function newPair(address pool, uint256 perBlock, uint256 rate) external returns (IPairToken);\n    function getPairToken(address pool) external view returns (address);\n}\n\ninterface IPairToken {\n    function setController(address _controller) external ;\n}\n\ncontract MPool is MBronze, MToken, MMath {\n\n    struct Record {\n        bool bound;   // is token bound to pool\n        uint index;   // private\n        uint denorm;  // denormalized weight\n        uint balance;\n    }\n\n    event LOG_SWAP(\n        address indexed caller,\n        address indexed tokenIn,\n        address indexed tokenOut,\n        uint256 tokenAmountIn,\n        uint256 tokenAmountOut\n    );\n\n    event LOG_JOIN(\n        address indexed caller,\n        address indexed tokenIn,\n        uint256 tokenAmountIn\n    );\n\n    event LOG_EXIT(\n        address indexed caller,\n        address indexed tokenOut,\n        uint256 tokenAmountOut\n    );\n\n    event LOG_CALL(\n        bytes4  indexed sig,\n        address indexed caller,\n        bytes data\n    ) anonymous;\n\n    modifier _logs_() {\n        emit LOG_CALL(msg.sig, msg.sender, msg.data);\n        _;\n    }\n\n    modifier _lock_() {\n        require(!_mutex, \"ERR_REENTRY\");\n        _mutex = true;\n        _;\n        _mutex = false;\n    }\n\n    modifier _viewlock_() {\n        require(!_mutex, \"ERR_REENTRY\");\n        _;\n    }\n\n    bool private _mutex;\n\n    IMFactory private _factory;    // MFactory address to push token exitFee to and check whitelist from factory\n    IMining private _pair;\n    address public controller;     // has CONTROL role\n\n    // `setSwapFee` and `finalize` require CONTROL\n    // `finalize` sets `PUBLIC can SWAP`, `PUBLIC can JOIN`\n    uint private _swapFee;\n    bool private _finalized;\n    bool private _publicSwap;     // true if PUBLIC can call SWAP functions\n\n    address[] private _tokens;\n    mapping(address =\u003e Record) private  _records;\n    uint private _totalWeight;\n\n    constructor() public {\n        controller = msg.sender;\n        _factory = IMFactory(msg.sender);\n\n        _swapFee = MIN_FEE;\n        _publicSwap = false;\n        _finalized = false;\n    }\n\n    function isPublicSwap()\n    external view\n    returns (bool)\n    {\n        return _publicSwap;\n    }\n\n    function isFinalized()\n    external view\n    returns (bool)\n    {\n        return _finalized;\n    }\n\n    function isBound(address t)\n    external view\n    returns (bool)\n    {\n        return _records[t].bound;\n    }\n\n    function getNumTokens()\n    external view\n    returns (uint)\n    {\n        return _tokens.length;\n    }\n\n    function getCurrentTokens()\n    external view _viewlock_\n    returns (address[] memory tokens)\n    {\n        return _tokens;\n    }\n\n    function getFinalTokens()\n    external view\n    _viewlock_\n    returns (address[] memory tokens)\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n        return _tokens;\n    }\n\n    function getDenormalizedWeight(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        return _records[token].denorm;\n    }\n\n    function getTotalDenormalizedWeight()\n    external view\n    _viewlock_\n    returns (uint)\n    {\n        return _totalWeight;\n    }\n\n    function getNormalizedWeight(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        uint denorm = _records[token].denorm;\n        return bdiv(denorm, _totalWeight);\n    }\n\n    function getBalance(address token)\n    external view\n    _viewlock_\n    returns (uint)\n    {\n\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        return _records[token].balance;\n    }\n\n    function getSwapFee()\n    external view\n    _viewlock_\n    returns (uint)\n    {\n        return _swapFee;\n    }\n\n    function getPair()\n    external view\n    _viewlock_\n    returns (address)\n    {\n        return address(_pair);\n    }\n\n    function setSwapFee(uint swapFee)\n    external\n    _logs_\n    _lock_\n    {\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(swapFee \u003e= MIN_FEE, \"ERR_MIN_FEE\");\n        require(swapFee \u003c= MAX_FEE, \"ERR_MAX_FEE\");\n        _swapFee = swapFee;\n    }\n\n    function setController(address manager)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        controller = manager;\n    }\n\n    function setPair(IMining pair)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        _setPair(pair);\n    }\n\n    function _setPair(IMining pair)\n    internal\n    {\n        _pair = pair;\n    }\n\n    function finalize(address beneficiary, uint fixPoolSupply)\n    external\n    _logs_\n    _lock_\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(!_finalized || totalSupply() == 0, \"ERR_IS_FINALIZED\");\n        require(_tokens.length \u003e= MIN_BOUND_TOKENS, \"ERR_MIN_TOKENS\");\n\n        _finalized = true;\n        _publicSwap = true;\n\n        uint256 supply = fixPoolSupply == 0 ? INIT_POOL_SUPPLY : fixPoolSupply;\n\n        _mintPoolShare(supply);\n        _pushPoolShare(beneficiary, supply);\n        _lpChanging(true, beneficiary, supply);\n    }\n\n\n    function bind(address token, uint balance, uint denorm)\n    external\n    _logs_\n        // _lock_  Bind does not lock because it jumps to `rebind`, which does\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(!_records[token].bound, \"ERR_IS_BOUND\");\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n\n        require(_tokens.length \u003c MAX_BOUND_TOKENS, \"ERR_MAX_TOKENS\");\n\n        _records[token] = Record({\n        bound: true,\n        index: _tokens.length,\n        denorm: 0,    // balance and denorm will be validated\n        balance: 0    // and set by `rebind`\n        });\n        _tokens.push(token);\n        rebind(token, balance, denorm);\n    }\n\n    function rebind(address token, uint balance, uint denorm)\n    public\n    _logs_\n    _lock_\n    {\n\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        require(!_finalized || totalSupply() == 0, \"ERR_IS_FINALIZED\");\n\n        require(denorm \u003e= MIN_WEIGHT, \"ERR_MIN_WEIGHT\");\n        require(denorm \u003c= MAX_WEIGHT, \"ERR_MAX_WEIGHT\");\n        require(balance \u003e= MIN_BALANCE, \"ERR_MIN_BALANCE\");\n\n        // Adjust the denorm and totalWeight\n        uint oldWeight = _records[token].denorm;\n        if (denorm \u003e oldWeight) {\n            _totalWeight = badd(_totalWeight, bsub(denorm, oldWeight));\n            require(_totalWeight \u003c= MAX_TOTAL_WEIGHT, \"ERR_MAX_TOTAL_WEIGHT\");\n        } else if (denorm \u003c oldWeight) {\n            _totalWeight = bsub(_totalWeight, bsub(oldWeight, denorm));\n        }\n        _records[token].denorm = denorm;\n\n        // Adjust the balance record and actual token balance\n        uint oldBalance = _records[token].balance;\n        _records[token].balance = balance;\n        if (balance \u003e oldBalance) {\n            _pullUnderlying(token, msg.sender, bsub(balance, oldBalance));\n        } else if (balance \u003c oldBalance) {\n            uint tokenBalanceWithdrawn = bsub(oldBalance, balance);\n            _pushUnderlying(token, msg.sender, tokenBalanceWithdrawn);\n        }\n    }\n\n    function unbind(address token)\n    external\n    _logs_\n    _lock_\n    {\n\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        require(!_finalized, \"ERR_IS_FINALIZED\");\n\n        uint tokenBalance = _records[token].balance;\n        _totalWeight = bsub(_totalWeight, _records[token].denorm);\n\n        // Swap the token-to-unbind with the last token,\n        // then delete the last token\n        uint index = _records[token].index;\n        uint last = _tokens.length - 1;\n        _tokens[index] = _tokens[last];\n        _records[_tokens[index]].index = index;\n        _tokens.pop();\n        _records[token] = Record({\n        bound: false,\n        index: 0,\n        denorm: 0,\n        balance: 0\n        });\n\n        _pushUnderlying(token, msg.sender, tokenBalance);\n    }\n\n    // Absorb any tokens that have been sent to this contract into the pool\n    function gulp(address token)\n    external\n    _logs_\n    _lock_\n    {\n        require(_records[token].bound, \"ERR_NOT_BOUND\");\n        _records[token].balance = IERC20(token).balanceOf(address(this));\n    }\n\n    function getSpotPrice(address tokenIn, address tokenOut)\n    external view\n    _viewlock_\n    returns (uint spotPrice)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        Record storage inRecord = _records[tokenIn];\n        Record storage outRecord = _records[tokenOut];\n        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, _swapFee);\n    }\n\n    function getSpotPriceSansFee(address tokenIn, address tokenOut)\n    external view\n    _viewlock_\n    returns (uint spotPrice)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        Record storage inRecord = _records[tokenIn];\n        Record storage outRecord = _records[tokenOut];\n        return calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, 0);\n    }\n\n    function joinPool(address beneficiary, uint poolAmountOut)\n    external\n    _logs_\n    _lock_\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n\n        uint poolTotal = totalSupply();\n        uint ratio = bdiv(poolAmountOut, poolTotal);\n        require(ratio != 0, \"ERR_MATH_APPROX\");\n\n        for (uint i = 0; i \u003c _tokens.length; i++) {\n            address t = _tokens[i];\n            uint bal = _records[t].balance;\n            uint tokenAmountIn = bmul(ratio, bal);\n            require(tokenAmountIn != 0, \"ERR_MATH_APPROX\");\n            require(bsub(IERC20(_tokens[i]).balanceOf(address(this)), _records[t].balance) \u003e= tokenAmountIn);\n            _records[t].balance = badd(_records[t].balance, tokenAmountIn);\n            emit LOG_JOIN(msg.sender, t, tokenAmountIn);\n        }\n        _mintPoolShare(poolAmountOut);\n        _pushPoolShare(beneficiary, poolAmountOut);\n\n        _lpChanging(true, beneficiary, poolAmountOut);\n    }\n\n    function exitPool(uint poolAmountIn, uint[] calldata minAmountsOut)\n    external\n    _logs_\n    _lock_\n    {\n        require(_finalized, \"ERR_NOT_FINALIZED\");\n\n        uint poolTotal = totalSupply();\n        uint ratio = bdiv(poolAmountIn, poolTotal);\n        require(ratio != 0, \"ERR_MATH_APPROX\");\n\n        _pullPoolShare(msg.sender, poolAmountIn);\n        _burnPoolShare(poolAmountIn);\n\n        for (uint i = 0; i \u003c _tokens.length; i++) {\n            address t = _tokens[i];\n            uint bal = _records[t].balance;\n            uint tokenAmountOut = bmul(ratio, bal);\n            require(tokenAmountOut != 0, \"ERR_MATH_APPROX\");\n            require(tokenAmountOut \u003e= minAmountsOut[i], \"ERR_LIMIT_OUT\");\n            _records[t].balance = bsub(_records[t].balance, tokenAmountOut);\n            emit LOG_EXIT(msg.sender, t, tokenAmountOut);\n            _pushUnderlying(t, msg.sender, tokenAmountOut);\n        }\n\n        _lpChanging(false, msg.sender, poolAmountIn);\n    }\n\n\n    function swapExactAmountIn(\n        address user,\n        address tokenIn,\n        address tokenOut,\n        uint minAmountOut,\n        address to,\n        uint maxPrice\n    )\n    external\n    _lock_\n    returns (uint tokenAmountOut, uint spotPriceAfter)\n    {\n\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        require(_publicSwap, \"ERR_SWAP_NOT_PUBLIC\");\n\n        Record storage inRecord = _records[address(tokenIn)];\n        Record storage outRecord = _records[address(tokenOut)];\n\n        uint tokenAmountIn = bsub(IERC20(tokenIn).balanceOf(address(this)), inRecord.balance);\n        require(tokenAmountIn \u003e 0, \"ERR_AMOUNTIN_NOT_IN_Pool\");\n        require(tokenAmountIn \u003c= bmul(inRecord.balance, MAX_IN_RATIO), \"ERR_MAX_IN_RATIO\");\n\n        uint256 factoryFee = bmul(tokenAmountIn, bmul(bdiv(_swapFee, 6), 1));\n\n        uint spotPriceBefore = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceBefore \u003c= maxPrice, \"ERR_BAD_LIMIT_PRICE\");\n\n        tokenAmountOut = calcOutGivenIn(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            tokenAmountIn,\n            _swapFee\n        );\n        require(tokenAmountOut \u003e= minAmountOut, \"ERR_LIMIT_OUT\");\n\n        uint inAfterFee = bsub(tokenAmountIn, factoryFee);\n        inRecord.balance = badd(inRecord.balance, inAfterFee);\n        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);\n\n        spotPriceAfter = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceAfter \u003e= spotPriceBefore, \"ERR_MATH_APPROX\");\n        require(spotPriceAfter \u003c= maxPrice, \"ERR_LIMIT_PRICE\");\n        require(spotPriceBefore \u003c= bdiv(tokenAmountIn, tokenAmountOut), \"ERR_MATH_APPROX\");\n\n        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        _pushUnderlying(tokenOut, to, tokenAmountOut);\n        _pushUnderlying(tokenIn, _factory.getFeeTo(), factoryFee);\n\n        _swapMining(user, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        return (tokenAmountOut, spotPriceAfter);\n    }\n\n    function swapExactAmountOut(\n        address user,\n        address tokenIn,\n        uint maxAmountIn,\n        address tokenOut,\n        uint tokenAmountOut,\n        address to,\n        uint maxPrice\n    )\n    external\n    _lock_\n    returns (uint tokenAmountIn, uint spotPriceAfter)\n    {\n        require(_records[tokenIn].bound, \"ERR_NOT_BOUND\");\n        require(_records[tokenOut].bound, \"ERR_NOT_BOUND\");\n        require(_publicSwap, \"ERR_SWAP_NOT_PUBLIC\");\n\n        Record storage inRecord = _records[address(tokenIn)];\n        Record storage outRecord = _records[address(tokenOut)];\n\n        require(tokenAmountOut \u003c= bmul(outRecord.balance, MAX_OUT_RATIO), \"ERR_MAX_OUT_RATIO\");\n\n        uint spotPriceBefore = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceBefore \u003c= maxPrice, \"ERR_BAD_LIMIT_PRICE\");\n\n        tokenAmountIn = calcInGivenOut(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            tokenAmountOut,\n            _swapFee\n        );\n        uint user_deposit_amount = bsub(IERC20(tokenIn).balanceOf(address(this)), inRecord.balance);\n        require(tokenAmountIn == user_deposit_amount \u0026\u0026 user_deposit_amount \u003c= maxAmountIn, \"ERR_LIMIT_IN\");\n\n        uint256 factoryFee = bmul(tokenAmountIn, bmul(bdiv(_swapFee, 6), 1));\n\n        inRecord.balance = badd(inRecord.balance, bsub(tokenAmountIn, factoryFee));\n        outRecord.balance = bsub(outRecord.balance, tokenAmountOut);\n\n        spotPriceAfter = calcSpotPrice(\n            inRecord.balance,\n            inRecord.denorm,\n            outRecord.balance,\n            outRecord.denorm,\n            _swapFee\n        );\n        require(spotPriceAfter \u003e= spotPriceBefore, \"ERR_MATH_APPROX\");\n        require(spotPriceAfter \u003c= maxPrice, \"ERR_LIMIT_PRICE\");\n        require(spotPriceBefore \u003c= bdiv(tokenAmountIn, tokenAmountOut), \"ERR_MATH_APPROX\");\n\n        emit LOG_SWAP(msg.sender, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n\n        _pushUnderlying(tokenOut, to, tokenAmountOut);\n        _pushUnderlying(tokenIn, _factory.getFeeTo(), factoryFee);\n\n        _swapMining(user, tokenIn, tokenOut, tokenAmountIn, tokenAmountOut);\n        return (tokenAmountIn, spotPriceAfter);\n    }\n\n    function calcDesireByGivenAmount(address tokenIn, address tokenOut, uint256 inAmount, uint256 outAmount)\n    external view\n    returns (uint desireAmount)\n    {\n        require(inAmount != 0 || outAmount != 0, \"ERR_AMOUNT_IS_ZERO\");\n        Record memory inRecord = _records[address(tokenIn)];\n        Record memory outRecord = _records[address(tokenOut)];\n        if (inAmount != 0) {\n            desireAmount = calcOutGivenIn(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, inAmount, _swapFee);\n        } else {\n            desireAmount = calcInGivenOut(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, outAmount, _swapFee);\n        }\n    }\n    function calcPoolSpotPrice(address tokenIn, address tokenOut, uint256 inAmount, uint256 outAmount)\n    external view\n    returns (uint256 price)\n    {\n        Record memory inRecord = _records[address(tokenIn)];\n        Record memory outRecord = _records[address(tokenOut)];\n        if (inAmount != 0 \u0026\u0026 outAmount != 0) {\n            uint256 factoryFee = bmul(inAmount, bmul(bdiv(_swapFee, 6), 1));\n            price = calcSpotPrice(\n                badd(inRecord.balance, bsub(inAmount, factoryFee)),\n                inRecord.denorm,\n                bsub(outRecord.balance, outAmount),\n                outRecord.denorm,\n                _swapFee);\n        } else {\n            price = calcSpotPrice(inRecord.balance, inRecord.denorm, outRecord.balance, outRecord.denorm, _swapFee);\n        }\n    }\n\n    function updatePairGPInfo(address[] calldata gps, uint[] calldata shares)\n    external\n    {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        if (address(_pair) != address(0))\n        {\n            _pair.updateGPInfo(gps, shares);\n        }\n    }\n\n    // \u0027Underlying\u0027 token-manipulation functions make external calls but are NOT locked\n    // You must `_lock_` or otherwise ensure reentry-safety\n\n    function _pullUnderlying(address erc20, address from, uint amount)\n    internal\n    {\n        safeTransferFrom(erc20, from, address(this), amount);\n    }\n\n    function _pushUnderlying(address erc20, address to, uint amount)\n    internal\n    {\n        safeTransfer(erc20, to, amount);\n    }\n\n    function _pullPoolShare(address from, uint amount)\n    internal\n    {\n        _pull(from, amount);\n    }\n\n    function _pushPoolShare(address to, uint amount)\n    internal\n    {\n        _push(to, amount);\n    }\n\n    function _mintPoolShare(uint amount)\n    internal\n    {\n        _mint(amount);\n    }\n\n    function _burnPoolShare(uint amount)\n    internal\n    {\n        _burn(amount);\n    }\n\n    function _lpChanging(bool add, address user, uint256 amount)\n    internal\n    {\n        if (address(_pair) != address(0))\n        {\n            add == true ? _pair.addLiquidity(false, user, amount) : _pair.removeLiquidity(false, user, amount);\n        }\n\n        (address lpMiningAdr, ) = _factory.getMining();\n        if (lpMiningAdr != address(0))\n        {\n            IMining mining = IMining(lpMiningAdr);\n            uint256[] memory balances = new uint256[](_tokens.length);\n            uint256[] memory weights = new uint256[](_tokens.length);\n            for (uint i = 0; i \u003c _tokens.length; i++) {\n                balances[i] = _records[_tokens[i]].balance;\n                weights[i] = bdiv(_records[_tokens[i]].denorm, _totalWeight);\n            }\n\n            mining.claimLiquidityShares(user, _tokens, balances, weights, amount, add);\n        }\n\n    }\n\n    function _swapMining(address user, address tokenIn, address tokenOut, uint256 tokenAmountIn, uint256 tokenAmountOut)\n    internal\n    {\n        ( ,address swapMiningAdr) = _factory.getMining();\n        if (swapMiningAdr != address(0)){\n            IMining mining = IMining(swapMiningAdr);\n            mining.claimSwapShare(user, tokenIn, tokenAmountIn, tokenOut, tokenAmountOut);\n        }\n    }\n\n    function _transferLiquidity(address src, address dst, uint amt) internal {\n        (address lpMiningAdr, ) = _factory.getMining();\n        if (lpMiningAdr != address(0)){\n            IMining mining = IMining(lpMiningAdr);\n            mining.onTransferLiquidity(src, dst, amt);\n        }\n    }\n\n    function transfer(address dst, uint amt) external returns (bool) {\n        require(_factory.isWhiteList(msg.sender) || _factory.isWhiteList(dst), \"ERR_NOT_WHITELIST\");\n        _move(msg.sender, dst, amt);\n        if(dst != address(this)){\n            _transferLiquidity(msg.sender, dst, amt);\n        }\n        return true;\n    }\n\n    function transferFrom(address src, address dst, uint amt) external returns (bool) {\n        require(_factory.isWhiteList(msg.sender) || _factory.isWhiteList(dst), \"ERR_NOT_WHITELIST\");\n        require(msg.sender == src || amt \u003c= _allowance[src][msg.sender], \"ERR_BTOKEN_BAD_CALLER\");\n        _move(src, dst, amt);\n        if (msg.sender != src \u0026\u0026 _allowance[src][msg.sender] != uint256(-1)) {\n            _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);\n            emit Approval(msg.sender, dst, _allowance[src][msg.sender]);\n        }\n        if(dst != address(this)){\n            _transferLiquidity(src, dst, amt);\n        }\n        return true;\n    }\n\n    function bindPair(\n        IPairFactory pairFactory,\n        address[] calldata gps,\n        uint[] calldata shares,\n        uint gpRate\n    ) external {\n        require(msg.sender == controller, \"ERR_NOT_CONTROLLER\");\n        IPairToken pair = pairFactory.newPair(address(this), 4 * 10 ** 18, gpRate);\n        _setPair(IMining(address(pair)));\n        if (gpRate \u003e 0 \u0026\u0026 gpRate \u003c= 15 \u0026\u0026 gps.length != 0 \u0026\u0026 gps.length == shares.length) {\n            _pair.updateGPInfo(gps, shares);\n        }\n        pair.setController(msg.sender);\n    }\n}\n"},"MToken.sol":{"content":"// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n\npragma solidity 0.5.12;\n\nimport \"./MNum.sol\";\n\n// Highly opinionated token implementation\n\ninterface IERC20 {\n    event Approval(address indexed src, address indexed dst, uint amt);\n    event Transfer(address indexed src, address indexed dst, uint amt);\n\n    function totalSupply() external view returns (uint);\n    function balanceOf(address whom) external view returns (uint);\n    function allowance(address src, address dst) external view returns (uint);\n\n    function approve(address dst, uint amt) external returns (bool);\n    function transfer(address dst, uint amt) external returns (bool);\n    function transferFrom(address src, address dst, uint amt) external returns (bool);\n}\n\ncontract MTokenBase is MNum {\n\n    mapping(address =\u003e uint)                   internal _balance;\n    mapping(address =\u003e mapping(address=\u003euint)) internal _allowance;\n    uint internal _totalSupply;\n\n    event Approval(address indexed src, address indexed dst, uint amt);\n    event Transfer(address indexed src, address indexed dst, uint amt);\n\n    function _mint(uint amt) internal {\n        _balance[address(this)] = badd(_balance[address(this)], amt);\n        _totalSupply = badd(_totalSupply, amt);\n        emit Transfer(address(0), address(this), amt);\n    }\n\n    function _burn(uint amt) internal {\n        require(_balance[address(this)] \u003e= amt, \"ERR_INSUFFICIENT_BAL\");\n        _balance[address(this)] = bsub(_balance[address(this)], amt);\n        _totalSupply = bsub(_totalSupply, amt);\n        emit Transfer(address(this), address(0), amt);\n    }\n\n    function _move(address src, address dst, uint amt) internal {\n        require(_balance[src] \u003e= amt, \"ERR_INSUFFICIENT_BAL\");\n        _balance[src] = bsub(_balance[src], amt);\n        _balance[dst] = badd(_balance[dst], amt);\n        emit Transfer(src, dst, amt);\n    }\n\n    function _push(address to, uint amt) internal {\n        _move(address(this), to, amt);\n    }\n\n    function _pull(address from, uint amt) internal {\n        _move(from, address(this), amt);\n    }\n}\n\ncontract MToken is MTokenBase, IERC20 {\n\n    string  private _name     = \"Mercurity Pool Token\";\n    string  private _symbol   = \"MPT\";\n    uint8   private _decimals = 18;\n\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    function symbol() public view returns (string memory) {\n        return _symbol;\n    }\n\n    function decimals() public view returns(uint8) {\n        return _decimals;\n    }\n\n    function allowance(address src, address dst) external view returns (uint) {\n        return _allowance[src][dst];\n    }\n\n    function balanceOf(address whom) external view returns (uint) {\n        return _balance[whom];\n    }\n\n    function totalSupply() public view returns (uint) {\n        return _totalSupply;\n    }\n\n    function approve(address dst, uint amt) external returns (bool) {\n        _allowance[msg.sender][dst] = amt;\n        emit Approval(msg.sender, dst, amt);\n        return true;\n    }\n\n    function increaseApproval(address dst, uint amt) external returns (bool) {\n        _allowance[msg.sender][dst] = badd(_allowance[msg.sender][dst], amt);\n        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n        return true;\n    }\n\n    function decreaseApproval(address dst, uint amt) external returns (bool) {\n        uint oldValue = _allowance[msg.sender][dst];\n        if (amt \u003e oldValue) {\n            _allowance[msg.sender][dst] = 0;\n        } else {\n            _allowance[msg.sender][dst] = bsub(oldValue, amt);\n        }\n        emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n        return true;\n    }\n\n    function transfer(address dst, uint amt) external returns (bool) {\n        _move(msg.sender, dst, amt);\n        return true;\n    }\n\n    function transferFrom(address src, address dst, uint amt) external returns (bool) {\n        require(msg.sender == src || amt \u003c= _allowance[src][msg.sender], \"ERR_BTOKEN_BAD_CALLER\");\n        _move(src, dst, amt);\n        if (msg.sender != src \u0026\u0026 _allowance[src][msg.sender] != uint256(-1)) {\n            _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);\n            emit Approval(msg.sender, dst, _allowance[src][msg.sender]);\n        }\n        return true;\n    }\n\n    function safeTransfer(\n        address token,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027transfer(address,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));\n        require(\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::safeTransfer: transfer failed\u0027\n        );\n    }\n\n    function safeTransferFrom(\n        address token,\n        address from,\n        address to,\n        uint256 value\n    ) internal {\n        // bytes4(keccak256(bytes(\u0027transferFrom(address,address,uint256)\u0027)));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));\n        require(\n            success \u0026\u0026 (data.length == 0 || abi.decode(data, (bool))),\n            \u0027TransferHelper::transferFrom: transferFrom failed\u0027\n        );\n    }\n}\n"}}