{
    "Function": "swap",
    "File": "contracts/contracts/Pair.sol",
    "Parent Contracts": [],
    "High-Level Calls": [
        "IPairCallee",
        "IERC20",
        "IERC20",
        "IERC20",
        "PairFactory",
        "IERC20",
        "PairFactory",
        "PairFactory"
    ],
    "Internal Calls": [
        "_update1",
        "_k",
        "lock",
        "_update0",
        "require(bool,string)",
        "_k",
        "_update",
        "require(bool)",
        "_safeTransfer",
        "require(bool,string)",
        "require(bool,string)",
        "require(bool,string)",
        "_safeTransfer",
        "require(bool,string)"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {\n        require(!PairFactory(factory).isPaused());\n        require(amount0Out > 0 || amount1Out > 0, 'IOA'); // Pair: INSUFFICIENT_OUTPUT_AMOUNT\n        (uint _reserve0, uint _reserve1) =  (reserve0, reserve1);\n        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'IL'); // Pair: INSUFFICIENT_LIQUIDITY\n\n        uint _balance0;\n        uint _balance1;\n        { // scope for _token{0,1}, avoids stack too deep errors\n        (address _token0, address _token1) = (token0, token1);\n        require(to != _token0 && to != _token1, 'IT'); // Pair: INVALID_TO\n        if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens\n        if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens\n        if (data.length > 0) IPairCallee(to).hook(msg.sender, amount0Out, amount1Out, data); // callback, used for flash loans\n        _balance0 = IERC20(_token0).balanceOf(address(this));\n        _balance1 = IERC20(_token1).balanceOf(address(this));\n        }\n        uint amount0In = _balance0 > _reserve0 - amount0Out ? _balance0 - (_reserve0 - amount0Out) : 0;\n        uint amount1In = _balance1 > _reserve1 - amount1Out ? _balance1 - (_reserve1 - amount1Out) : 0;\n        require(amount0In > 0 || amount1In > 0, 'IIA'); // Pair: INSUFFICIENT_INPUT_AMOUNT\n        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors\n        (address _token0, address _token1) = (token0, token1);\n        if (amount0In > 0) _update0(amount0In * PairFactory(factory).getFee(stable) / 10000); // accrue fees for token0 and move them out of pool\n        if (amount1In > 0) _update1(amount1In * PairFactory(factory).getFee(stable) / 10000); // accrue fees for token1 and move them out of pool\n        _balance0 = IERC20(_token0).balanceOf(address(this)); // since we removed tokens, we need to reconfirm balances, can also simply use previous balance - amountIn/ 10000, but doing balanceOf again as safety check\n        _balance1 = IERC20(_token1).balanceOf(address(this));\n        // The curve, either x3y+y3x for stable pools, or x*y for volatile pools\n        require(_k(_balance0, _balance1) >= _k(_reserve0, _reserve1), 'K'); // Pair: K\n        }\n\n        _update(_balance0, _balance1, _reserve0, _reserve1);\n        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);\n    }"
}