{
    "Function": "doubleSwap",
    "File": "contracts/dex-v2/pool/BasePoolV2.sol",
    "Parent Contracts": [
        "node_modules/@openzeppelin/contracts/security/ReentrancyGuard.sol",
        "node_modules/@openzeppelin/contracts/token/ERC721/ERC721.sol",
        "node_modules/@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol",
        "node_modules/@openzeppelin/contracts/token/ERC721/IERC721.sol",
        "node_modules/@openzeppelin/contracts/utils/introspection/ERC165.sol",
        "node_modules/@openzeppelin/contracts/utils/introspection/IERC165.sol",
        "node_modules/@openzeppelin/contracts/utils/Context.sol",
        "contracts/dex/utils/GasThrottle.sol",
        "contracts/shared/ProtocolConstants.sol",
        "contracts/interfaces/dex-v2/pool/IBasePoolV2.sol"
    ],
    "High-Level Calls": [
        "VaderMath",
        "SafeERC20",
        "VaderMath",
        "IERC20"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "nonReentrant",
        "_update",
        "onlyRouter",
        "require(bool,string)",
        "_update",
        "require(bool,string)",
        "supportedToken",
        "validateGas",
        "supportedToken",
        "getReserves",
        "getReserves"
    ],
    "Library Calls": [
        "safeTransfer",
        "calculateSwap",
        "calculateSwap"
    ],
    "Low-Level Calls": [],
    "Code": "function doubleSwap(\r\n        IERC20 foreignAssetA,\r\n        IERC20 foreignAssetB,\r\n        uint256 foreignAmountIn,\r\n        address to\r\n    )\r\n        external\r\n        override\r\n        onlyRouter\r\n        supportedToken(foreignAssetA)\r\n        supportedToken(foreignAssetB)\r\n        nonReentrant\r\n        validateGas\r\n        returns (uint256 foreignAmountOut)\r\n    {\r\n        (uint112 nativeReserve, uint112 foreignReserve, ) = getReserves(\r\n            foreignAssetA\r\n        ); // gas savings\r\n\r\n        require(\r\n            foreignReserve + foreignAmountIn <=\r\n                foreignAssetA.balanceOf(address(this)),\r\n            \"BasePoolV2::doubleSwap: Insufficient Tokens Provided\"\r\n        );\r\n\r\n        uint256 nativeAmountOut = VaderMath.calculateSwap(\r\n            foreignAmountIn,\r\n            foreignReserve,\r\n            nativeReserve\r\n        );\r\n\r\n        require(\r\n            nativeAmountOut > 0 && nativeAmountOut <= nativeReserve,\r\n            \"BasePoolV2::doubleSwap: Swap Impossible\"\r\n        );\r\n\r\n        _update(\r\n            foreignAssetA,\r\n            nativeReserve - nativeAmountOut,\r\n            foreignReserve + foreignAmountIn,\r\n            nativeReserve,\r\n            foreignReserve\r\n        );\r\n\r\n        emit Swap(\r\n            foreignAssetA,\r\n            msg.sender,\r\n            0,\r\n            foreignAmountIn,\r\n            nativeAmountOut,\r\n            0,\r\n            address(this)\r\n        );\r\n\r\n        (nativeReserve, foreignReserve, ) = getReserves(foreignAssetB); // gas savings\r\n\r\n        foreignAmountOut = VaderMath.calculateSwap(\r\n            nativeAmountOut,\r\n            nativeReserve,\r\n            foreignReserve\r\n        );\r\n\r\n        require(\r\n            foreignAmountOut > 0 && foreignAmountOut <= foreignReserve,\r\n            \"BasePoolV2::doubleSwap: Swap Impossible\"\r\n        );\r\n\r\n        _update(\r\n            foreignAssetB,\r\n            nativeReserve + nativeAmountOut,\r\n            foreignReserve - foreignAmountOut,\r\n            nativeReserve,\r\n            foreignReserve\r\n        );\r\n\r\n        emit Swap(\r\n            foreignAssetB,\r\n            msg.sender,\r\n            nativeAmountOut,\r\n            0,\r\n            0,\r\n            foreignAmountOut,\r\n            to\r\n        );\r\n\r\n        foreignAssetB.safeTransfer(to, foreignAmountOut);\r\n    }"
}