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// Sources flattened with hardhat v2.0.11 https://hardhat.org |
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// File contracts/uniswapv2/interfaces/IUniswapV2Factory.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity >=0.5.0; |
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interface IUniswapV2Factory { |
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event PairCreated(address indexed token0, address indexed token1, address pair, uint); |
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function feeTo() external view returns (address); |
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function feeToSetter() external view returns (address); |
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function migrator() external view returns (address); |
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function getPair(address tokenA, address tokenB) external view returns (address pair); |
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function allPairs(uint) external view returns (address pair); |
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function allPairsLength() external view returns (uint); |
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function createPair(address tokenA, address tokenB) external returns (address pair); |
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function setFeeTo(address) external; |
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function setFeeToSetter(address) external; |
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function setMigrator(address) external; |
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} |
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// File contracts/uniswapv2/libraries/SafeMath.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math) |
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library SafeMathUniswap { |
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function add(uint x, uint y) internal pure returns (uint z) { |
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require((z = x + y) >= x, 'ds-math-add-overflow'); |
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} |
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function sub(uint x, uint y) internal pure returns (uint z) { |
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require((z = x - y) <= x, 'ds-math-sub-underflow'); |
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} |
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function mul(uint x, uint y) internal pure returns (uint z) { |
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require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow'); |
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} |
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} |
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// File contracts/uniswapv2/UniswapV2ERC20.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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contract UniswapV2ERC20 { |
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using SafeMathUniswap for uint; |
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string public constant name = 'SushiSwap LP Token'; |
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string public constant symbol = 'SLP'; |
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uint8 public constant decimals = 18; |
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uint public totalSupply; |
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mapping(address => uint) public balanceOf; |
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mapping(address => mapping(address => uint)) public allowance; |
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bytes32 public DOMAIN_SEPARATOR; |
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// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); |
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bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; |
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mapping(address => uint) public nonces; |
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event Approval(address indexed owner, address indexed spender, uint value); |
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event Transfer(address indexed from, address indexed to, uint value); |
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constructor() public { |
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uint chainId; |
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assembly { |
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chainId := chainid() |
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} |
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DOMAIN_SEPARATOR = keccak256( |
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abi.encode( |
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keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'), |
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keccak256(bytes(name)), |
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keccak256(bytes('1')), |
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chainId, |
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address(this) |
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) |
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); |
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} |
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function _mint(address to, uint value) internal { |
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totalSupply = totalSupply.add(value); |
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balanceOf[to] = balanceOf[to].add(value); |
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emit Transfer(address(0), to, value); |
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} |
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function _burn(address from, uint value) internal { |
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balanceOf[from] = balanceOf[from].sub(value); |
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totalSupply = totalSupply.sub(value); |
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emit Transfer(from, address(0), value); |
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} |
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function _approve(address owner, address spender, uint value) private { |
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allowance[owner][spender] = value; |
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emit Approval(owner, spender, value); |
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} |
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function _transfer(address from, address to, uint value) private { |
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balanceOf[from] = balanceOf[from].sub(value); |
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balanceOf[to] = balanceOf[to].add(value); |
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emit Transfer(from, to, value); |
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} |
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function approve(address spender, uint value) external returns (bool) { |
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_approve(msg.sender, spender, value); |
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return true; |
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} |
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function transfer(address to, uint value) external returns (bool) { |
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_transfer(msg.sender, to, value); |
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return true; |
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} |
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function transferFrom(address from, address to, uint value) external returns (bool) { |
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if (allowance[from][msg.sender] != uint(-1)) { |
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allowance[from][msg.sender] = allowance[from][msg.sender].sub(value); |
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} |
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_transfer(from, to, value); |
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return true; |
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} |
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function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external { |
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require(deadline >= block.timestamp, 'UniswapV2: EXPIRED'); |
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bytes32 digest = keccak256( |
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abi.encodePacked( |
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'\x19\x01', |
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DOMAIN_SEPARATOR, |
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keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)) |
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) |
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); |
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address recoveredAddress = ecrecover(digest, v, r, s); |
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require(recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE'); |
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_approve(owner, spender, value); |
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} |
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} |
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// File contracts/uniswapv2/libraries/Math.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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// a library for performing various math operations |
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library Math { |
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function min(uint x, uint y) internal pure returns (uint z) { |
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z = x < y ? x : y; |
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} |
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// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) |
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function sqrt(uint y) internal pure returns (uint z) { |
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if (y > 3) { |
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z = y; |
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uint x = y / 2 + 1; |
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while (x < z) { |
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z = x; |
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x = (y / x + x) / 2; |
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} |
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} else if (y != 0) { |
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z = 1; |
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} |
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} |
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} |
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// File contracts/uniswapv2/libraries/UQ112x112.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format)) |
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// range: [0, 2**112 - 1] |
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// resolution: 1 / 2**112 |
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library UQ112x112 { |
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uint224 constant Q112 = 2**112; |
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// encode a uint112 as a UQ112x112 |
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function encode(uint112 y) internal pure returns (uint224 z) { |
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z = uint224(y) * Q112; // never overflows |
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} |
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// divide a UQ112x112 by a uint112, returning a UQ112x112 |
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function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) { |
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z = x / uint224(y); |
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} |
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} |
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// File contracts/uniswapv2/interfaces/IERC20.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity >=0.5.0; |
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interface IERC20Uniswap { |
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event Approval(address indexed owner, address indexed spender, uint value); |
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event Transfer(address indexed from, address indexed to, uint value); |
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function name() external view returns (string memory); |
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function symbol() external view returns (string memory); |
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function decimals() external view returns (uint8); |
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function totalSupply() external view returns (uint); |
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function balanceOf(address owner) external view returns (uint); |
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function allowance(address owner, address spender) external view returns (uint); |
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function approve(address spender, uint value) external returns (bool); |
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function transfer(address to, uint value) external returns (bool); |
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function transferFrom(address from, address to, uint value) external returns (bool); |
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} |
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// File contracts/uniswapv2/interfaces/IUniswapV2Callee.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity >=0.5.0; |
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interface IUniswapV2Callee { |
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function uniswapV2Call(address sender, uint amount0, uint amount1, bytes calldata data) external; |
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} |
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// File contracts/uniswapv2/UniswapV2Pair.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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interface IMigrator { |
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// Return the desired amount of liquidity token that the migrator wants. |
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function desiredLiquidity() external view returns (uint256); |
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} |
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contract UniswapV2Pair is UniswapV2ERC20 { |
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using SafeMathUniswap for uint; |
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using UQ112x112 for uint224; |
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uint public constant MINIMUM_LIQUIDITY = 10**3; |
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bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)'))); |
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address public factory; |
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address public token0; |
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address public token1; |
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uint112 private reserve0; // uses single storage slot, accessible via getReserves |
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uint112 private reserve1; // uses single storage slot, accessible via getReserves |
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uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves |
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uint public price0CumulativeLast; |
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uint public price1CumulativeLast; |
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uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event |
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uint private unlocked = 1; |
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modifier lock() { |
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require(unlocked == 1, 'UniswapV2: LOCKED'); |
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unlocked = 0; |
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_; |
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unlocked = 1; |
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} |
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function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) { |
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_reserve0 = reserve0; |
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_reserve1 = reserve1; |
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_blockTimestampLast = blockTimestampLast; |
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} |
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function _safeTransfer(address token, address to, uint value) private { |
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(bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value)); |
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require(success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED'); |
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} |
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event Mint(address indexed sender, uint amount0, uint amount1); |
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event Burn(address indexed sender, uint amount0, uint amount1, address indexed to); |
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event Swap( |
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address indexed sender, |
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uint amount0In, |
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uint amount1In, |
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uint amount0Out, |
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uint amount1Out, |
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address indexed to |
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); |
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event Sync(uint112 reserve0, uint112 reserve1); |
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constructor() public { |
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factory = msg.sender; |
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} |
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// called once by the factory at time of deployment |
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function initialize(address _token0, address _token1) external { |
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require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check |
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token0 = _token0; |
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token1 = _token1; |
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} |
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// update reserves and, on the first call per block, price accumulators |
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function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private { |
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require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW'); |
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uint32 blockTimestamp = uint32(block.timestamp % 2**32); |
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uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired |
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if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) { |
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// * never overflows, and + overflow is desired |
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price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed; |
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price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed; |
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} |
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reserve0 = uint112(balance0); |
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reserve1 = uint112(balance1); |
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blockTimestampLast = blockTimestamp; |
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emit Sync(reserve0, reserve1); |
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} |
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// if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k) |
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function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) { |
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address feeTo = IUniswapV2Factory(factory).feeTo(); |
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feeOn = feeTo != address(0); |
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uint _kLast = kLast; // gas savings |
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if (feeOn) { |
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if (_kLast != 0) { |
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uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1)); |
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uint rootKLast = Math.sqrt(_kLast); |
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if (rootK > rootKLast) { |
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uint numerator = totalSupply.mul(rootK.sub(rootKLast)); |
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uint denominator = rootK.mul(5).add(rootKLast); |
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uint liquidity = numerator / denominator; |
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if (liquidity > 0) _mint(feeTo, liquidity); |
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} |
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} |
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} else if (_kLast != 0) { |
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kLast = 0; |
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} |
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} |
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// this low-level function should be called from a contract which performs important safety checks |
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function mint(address to) external lock returns (uint liquidity) { |
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(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings |
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uint balance0 = IERC20Uniswap(token0).balanceOf(address(this)); |
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uint balance1 = IERC20Uniswap(token1).balanceOf(address(this)); |
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uint amount0 = balance0.sub(_reserve0); |
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uint amount1 = balance1.sub(_reserve1); |
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bool feeOn = _mintFee(_reserve0, _reserve1); |
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uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee |
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if (_totalSupply == 0) { |
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address migrator = IUniswapV2Factory(factory).migrator(); |
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if (msg.sender == migrator) { |
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liquidity = IMigrator(migrator).desiredLiquidity(); |
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require(liquidity > 0 && liquidity != uint256(-1), "Bad desired liquidity"); |
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} else { |
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require(migrator == address(0), "Must not have migrator"); |
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liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY); |
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_mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens |
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} |
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} else { |
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liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1); |
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} |
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require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED'); |
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_mint(to, liquidity); |
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_update(balance0, balance1, _reserve0, _reserve1); |
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if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date |
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emit Mint(msg.sender, amount0, amount1); |
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} |
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// this low-level function should be called from a contract which performs important safety checks |
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function burn(address to) external lock returns (uint amount0, uint amount1) { |
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(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings |
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address _token0 = token0; // gas savings |
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address _token1 = token1; // gas savings |
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uint balance0 = IERC20Uniswap(_token0).balanceOf(address(this)); |
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uint balance1 = IERC20Uniswap(_token1).balanceOf(address(this)); |
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uint liquidity = balanceOf[address(this)]; |
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bool feeOn = _mintFee(_reserve0, _reserve1); |
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uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee |
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amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution |
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amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution |
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require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED'); |
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_burn(address(this), liquidity); |
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_safeTransfer(_token0, to, amount0); |
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_safeTransfer(_token1, to, amount1); |
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balance0 = IERC20Uniswap(_token0).balanceOf(address(this)); |
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balance1 = IERC20Uniswap(_token1).balanceOf(address(this)); |
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_update(balance0, balance1, _reserve0, _reserve1); |
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if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date |
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emit Burn(msg.sender, amount0, amount1, to); |
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} |
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// this low-level function should be called from a contract which performs important safety checks |
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function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock { |
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require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT'); |
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(uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings |
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require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY'); |
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uint balance0; |
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uint balance1; |
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{ // scope for _token{0,1}, avoids stack too deep errors |
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address _token0 = token0; |
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address _token1 = token1; |
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require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO'); |
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if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens |
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if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens |
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if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data); |
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balance0 = IERC20Uniswap(_token0).balanceOf(address(this)); |
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balance1 = IERC20Uniswap(_token1).balanceOf(address(this)); |
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} |
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uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0; |
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uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0; |
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require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT'); |
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{ // scope for reserve{0,1}Adjusted, avoids stack too deep errors |
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uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3)); |
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uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3)); |
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require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K'); |
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} |
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_update(balance0, balance1, _reserve0, _reserve1); |
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emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to); |
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} |
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// force balances to match reserves |
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function skim(address to) external lock { |
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address _token0 = token0; // gas savings |
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address _token1 = token1; // gas savings |
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_safeTransfer(_token0, to, IERC20Uniswap(_token0).balanceOf(address(this)).sub(reserve0)); |
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_safeTransfer(_token1, to, IERC20Uniswap(_token1).balanceOf(address(this)).sub(reserve1)); |
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} |
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// force reserves to match balances |
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function sync() external lock { |
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_update(IERC20Uniswap(token0).balanceOf(address(this)), IERC20Uniswap(token1).balanceOf(address(this)), reserve0, reserve1); |
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} |
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} |
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// File contracts/uniswapv2/UniswapV2Factory.sol |
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// SPDX-License-Identifier: GPL-3.0 |
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pragma solidity =0.6.12; |
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contract UniswapV2Factory is IUniswapV2Factory { |
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address public override feeTo; |
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address public override feeToSetter; |
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address public override migrator; |
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mapping(address => mapping(address => address)) public override getPair; |
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address[] public override allPairs; |
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event PairCreated(address indexed token0, address indexed token1, address pair, uint); |
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constructor(address _feeToSetter) public { |
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feeToSetter = _feeToSetter; |
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} |
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function allPairsLength() external override view returns (uint) { |
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return allPairs.length; |
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} |
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function pairCodeHash() external pure returns (bytes32) { |
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return keccak256(type(UniswapV2Pair).creationCode); |
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} |
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function createPair(address tokenA, address tokenB) external override returns (address pair) { |
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require(tokenA != tokenB, 'UniswapV2: IDENTICAL_ADDRESSES'); |
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(address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA); |
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require(token0 != address(0), 'UniswapV2: ZERO_ADDRESS'); |
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require(getPair[token0][token1] == address(0), 'UniswapV2: PAIR_EXISTS'); // single check is sufficient |
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bytes memory bytecode = type(UniswapV2Pair).creationCode; |
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bytes32 salt = keccak256(abi.encodePacked(token0, token1)); |
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assembly { |
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pair := create2(0, add(bytecode, 32), mload(bytecode), salt) |
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} |
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UniswapV2Pair(pair).initialize(token0, token1); |
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getPair[token0][token1] = pair; |
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getPair[token1][token0] = pair; // populate mapping in the reverse direction |
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allPairs.push(pair); |
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emit PairCreated(token0, token1, pair, allPairs.length); |
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} |
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function setFeeTo(address _feeTo) external override { |
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require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN'); |
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feeTo = _feeTo; |
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} |
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function setMigrator(address _migrator) external override { |
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require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN'); |
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migrator = _migrator; |
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} |
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|
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function setFeeToSetter(address _feeToSetter) external override { |
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require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN'); |
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feeToSetter = _feeToSetter; |
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} |
|
|
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} |