{
    "Function": "swap",
    "File": "contracts/dex/pool/BasePool.sol",
    "Parent Contracts": [
        "node_modules/@openzeppelin/contracts/security/ReentrancyGuard.sol",
        "node_modules/@openzeppelin/contracts/access/Ownable.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/pool/IBasePool.sol"
    ],
    "High-Level Calls": [
        "SafeERC20",
        "VaderMath",
        "IERC20",
        "IERC20",
        "IERC20",
        "IERC20",
        "SafeERC20",
        "VaderMath"
    ],
    "Internal Calls": [
        "_update",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "nonReentrant",
        "validateGas",
        "require(bool,string)",
        "getReserves",
        "require(bool,string)"
    ],
    "Library Calls": [
        "safeTransfer",
        "safeTransfer",
        "calculateSwap",
        "calculateSwap"
    ],
    "Low-Level Calls": [],
    "Code": "function swap(\r\n        uint256 nativeAmountIn,\r\n        uint256 foreignAmountIn,\r\n        address to\r\n    ) public override nonReentrant validateGas returns (uint256) {\r\n        require(\r\n            (nativeAmountIn > 0 && foreignAmountIn == 0) ||\r\n                (nativeAmountIn == 0 && foreignAmountIn > 0),\r\n            \"BasePool::swap: Only One-Sided Swaps Supported\"\r\n        );\r\n        (uint112 nativeReserve, uint112 foreignReserve, ) = getReserves(); // gas savings\r\n\r\n        uint256 nativeBalance;\r\n        uint256 foreignBalance;\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            IERC20 _foreignAsset = foreignAsset;\r\n            nativeBalance = _nativeAsset.balanceOf(address(this));\r\n            foreignBalance = _foreignAsset.balanceOf(address(this));\r\n\r\n            require(\r\n                to != address(_nativeAsset) && to != address(_foreignAsset),\r\n                \"BasePool::swap: Invalid Receiver\"\r\n            );\r\n\r\n            if (foreignAmountIn > 0) {\r\n                require(\r\n                    foreignAmountIn <= foreignBalance - foreignReserve,\r\n                    \"BasePool::swap: Insufficient Tokens Provided\"\r\n                );\r\n                require(\r\n                    foreignAmountIn <= foreignReserve,\r\n                    \"BasePool::swap: Unfavourable Trade\"\r\n                );\r\n\r\n                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                    \"BasePool::swap: Swap Impossible\"\r\n                );\r\n\r\n                _nativeAsset.safeTransfer(to, nativeAmountOut); // optimistically transfer tokens\r\n            } else {\r\n                require(\r\n                    nativeAmountIn <= nativeBalance - nativeReserve,\r\n                    \"BasePool::swap: Insufficient Tokens Provided\"\r\n                );\r\n                require(\r\n                    nativeAmountIn <= nativeReserve,\r\n                    \"BasePool::swap: Unfavourable Trade\"\r\n                );\r\n\r\n                foreignAmountOut = VaderMath.calculateSwap(\r\n                    nativeAmountIn,\r\n                    nativeReserve,\r\n                    foreignReserve\r\n                );\r\n\r\n                require(\r\n                    foreignAmountOut > 0 && foreignAmountOut <= foreignReserve,\r\n                    \"BasePool::swap: Swap Impossible\"\r\n                );\r\n\r\n                _foreignAsset.safeTransfer(to, foreignAmountOut); // optimistically transfer tokens\r\n            }\r\n\r\n            nativeBalance = _nativeAsset.balanceOf(address(this));\r\n            foreignBalance = _foreignAsset.balanceOf(address(this));\r\n        }\r\n\r\n        _update(nativeBalance, foreignBalance, nativeReserve, foreignReserve);\r\n\r\n        emit Swap(\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    }"
}