{
    "Function": "swap",
    "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",
        "SafeERC20",
        "VaderMath"
    ],
    "Internal Calls": [
        "nonReentrant",
        "supportedToken",
        "require(bool,string)",
        "_update",
        "onlyRouter",
        "require(bool,string)",
        "require(bool,string)",
        "validateGas",
        "getReserves",
        "require(bool,string)"
    ],
    "Library Calls": [
        "calculateSwap",
        "safeTransfer",
        "calculateSwap",
        "safeTransfer"
    ],
    "Low-Level Calls": [],
    "Code": "function swap(\r\n        IERC20 foreignAsset,\r\n        uint256 nativeAmountIn,\r\n        uint256 foreignAmountIn,\r\n        address to\r\n    )\r\n        external\r\n        override\r\n        onlyRouter\r\n        supportedToken(foreignAsset)\r\n        nonReentrant\r\n        validateGas\r\n        returns (uint256)\r\n    {\r\n        require(\r\n            (nativeAmountIn > 0 && foreignAmountIn == 0) ||\r\n                (nativeAmountIn == 0 && foreignAmountIn > 0),\r\n            \"BasePoolV2::swap: Only One-Sided Swaps Supported\"\r\n        );\r\n        (uint112 nativeReserve, uint112 foreignReserve, ) = getReserves(\r\n            foreignAsset\r\n        ); // gas savings\r\n\r\n        uint256 nativeAmountOut;\r\n        uint256 foreignAmountOut;\r\n        {\r\n            // scope for _token{0,1}, avoids stack too deep errors\r\n            IERC20 _nativeAsset = nativeAsset;\r\n            require(\r\n                to != address(_nativeAsset) && to != address(foreignAsset),\r\n                \"BasePoolV2::swap: Invalid Receiver\"\r\n            );\r\n\r\n            if (foreignAmountIn > 0) {\r\n                nativeAmountOut = VaderMath.calculateSwap(\r\n                    foreignAmountIn,\r\n                    foreignReserve,\r\n                    nativeReserve\r\n                );\r\n                require(\r\n                    nativeAmountOut > 0 && nativeAmountOut <= nativeReserve,\r\n                    \"BasePoolV2::swap: Swap Impossible\"\r\n                );\r\n                _nativeAsset.safeTransfer(to, nativeAmountOut); // optimistically transfer tokens\r\n            } else {\r\n                foreignAmountOut = VaderMath.calculateSwap(\r\n                    nativeAmountIn,\r\n                    nativeReserve,\r\n                    foreignReserve\r\n                );\r\n                require(\r\n                    foreignAmountOut > 0 && foreignAmountOut <= foreignReserve,\r\n                    \"BasePoolV2::swap: Swap Impossible\"\r\n                );\r\n                foreignAsset.safeTransfer(to, foreignAmountOut); // optimistically transfer tokens\r\n            }\r\n        }\r\n\r\n        _update(\r\n            foreignAsset,\r\n            nativeReserve - nativeAmountOut + nativeAmountIn,\r\n            foreignReserve - foreignAmountOut + foreignAmountIn,\r\n            nativeReserve,\r\n            foreignReserve\r\n        );\r\n\r\n        emit Swap(\r\n            foreignAsset,\r\n            msg.sender,\r\n            nativeAmountIn,\r\n            foreignAmountIn,\r\n            nativeAmountOut,\r\n            foreignAmountOut,\r\n            to\r\n        );\r\n\r\n        return nativeAmountOut > 0 ? nativeAmountOut : foreignAmountOut;\r\n    }"
}