637 lines
21 KiB
Solidity
637 lines
21 KiB
Solidity
/**
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*Submitted for verification at Etherscan.io on 2020-05-05
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*/
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// File: contracts/interfaces/IUniswapV2Pair.sol
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pragma solidity >=0.5.0;
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interface IUniswapV2Pair {
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event Approval(address indexed owner, address indexed spender, uint256 value);
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event Transfer(address indexed from, address indexed to, uint256 value);
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function name() external pure returns (string memory);
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function symbol() external pure returns (string memory);
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function decimals() external pure returns (uint8);
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function totalSupply() external view returns (uint256);
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function balanceOf(address owner) external view returns (uint256);
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function allowance(address owner, address spender) external view returns (uint256);
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function approve(address spender, uint256 value) external returns (bool);
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function transfer(address to, uint256 value) external returns (bool);
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function transferFrom(
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address from,
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address to,
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uint256 value
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) external returns (bool);
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function DOMAIN_SEPARATOR() external view returns (bytes32);
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function PERMIT_TYPEHASH() external pure returns (bytes32);
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function nonces(address owner) external view returns (uint256);
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function permit(
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address owner,
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address spender,
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uint256 value,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) external;
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event Mint(address indexed sender, uint256 amount0, uint256 amount1);
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event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
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event Swap(
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address indexed sender,
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uint256 amount0In,
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uint256 amount1In,
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uint256 amount0Out,
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uint256 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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function MINIMUM_LIQUIDITY() external pure returns (uint256);
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function factory() external view returns (address);
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function token0() external view returns (address);
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function token1() external view returns (address);
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function getReserves()
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external
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view
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returns (
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uint112 reserve0,
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uint112 reserve1,
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uint32 blockTimestampLast
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);
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function price0CumulativeLast() external view returns (uint256);
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function price1CumulativeLast() external view returns (uint256);
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function kLast() external view returns (uint256);
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function mint(address to) external returns (uint256 liquidity);
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function burn(address to) external returns (uint256 amount0, uint256 amount1);
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function swap(
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uint256 amount0Out,
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uint256 amount1Out,
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address to,
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bytes calldata data
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) external;
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function skim(address to) external;
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function sync() external;
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function initialize(address, address) external;
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}
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// File: contracts/interfaces/IUniswapV2ERC20.sol
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pragma solidity >=0.5.0;
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interface IUniswapV2ERC20 {
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event Approval(address indexed owner, address indexed spender, uint256 value);
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event Transfer(address indexed from, address indexed to, uint256 value);
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function name() external pure returns (string memory);
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function symbol() external pure returns (string memory);
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function decimals() external pure returns (uint8);
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function totalSupply() external view returns (uint256);
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function balanceOf(address owner) external view returns (uint256);
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function allowance(address owner, address spender) external view returns (uint256);
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function approve(address spender, uint256 value) external returns (bool);
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function transfer(address to, uint256 value) external returns (bool);
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function transferFrom(
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address from,
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address to,
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uint256 value
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) external returns (bool);
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function DOMAIN_SEPARATOR() external view returns (bytes32);
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function PERMIT_TYPEHASH() external pure returns (bytes32);
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function nonces(address owner) external view returns (uint256);
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function permit(
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address owner,
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address spender,
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uint256 value,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) external;
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}
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// File: contracts/libraries/SafeMath.sol
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pragma solidity 0.6.9;
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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 SafeMath {
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function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
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require((z = x + y) >= x, "ds-math-add-overflow");
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}
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function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
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require((z = x - y) <= x, "ds-math-sub-underflow");
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}
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function mul(uint256 x, uint256 y) internal pure returns (uint256 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/UniswapV2ERC20.sol
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pragma solidity 0.6.9;
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contract UniswapV2ERC20 {
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using SafeMath for uint256;
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string public constant name = "Uniswap V2";
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string public constant symbol = "UNI-V2";
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uint8 public constant decimals = 18;
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uint256 public totalSupply;
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mapping(address => uint256) public balanceOf;
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mapping(address => mapping(address => uint256)) 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 => uint256) public nonces;
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event Approval(address indexed owner, address indexed spender, uint256 value);
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event Transfer(address indexed from, address indexed to, uint256 value);
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function _mint(address to, uint256 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, uint256 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(
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address owner,
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address spender,
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uint256 value
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) 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(
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address from,
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address to,
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uint256 value
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) 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, uint256 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, uint256 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(
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address from,
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address to,
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uint256 value
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) external returns (bool) {
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if (allowance[from][msg.sender] != uint256(-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(
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address owner,
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address spender,
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uint256 value,
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uint256 deadline,
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uint8 v,
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bytes32 r,
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bytes32 s
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) 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(
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abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)
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)
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)
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);
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address recoveredAddress = ecrecover(digest, v, r, s);
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require(
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recoveredAddress != address(0) && recoveredAddress == owner,
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"UniswapV2: INVALID_SIGNATURE"
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);
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_approve(owner, spender, value);
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}
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}
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// File: contracts/libraries/Math.sol
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pragma solidity 0.6.9;
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// a library for performing various math operations
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library Math {
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function min(uint256 x, uint256 y) internal pure returns (uint256 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(uint256 y) internal pure returns (uint256 z) {
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if (y > 3) {
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z = y;
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uint256 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/libraries/UQ112x112.sol
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pragma solidity 0.6.9;
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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/interfaces/IERC20.sol
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pragma solidity >=0.5.0;
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interface IERC20 {
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event Approval(address indexed owner, address indexed spender, uint256 value);
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event Transfer(address indexed from, address indexed to, uint256 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 (uint256);
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function balanceOf(address owner) external view returns (uint256);
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function allowance(address owner, address spender) external view returns (uint256);
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function approve(address spender, uint256 value) external returns (bool);
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function transfer(address to, uint256 value) external returns (bool);
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function transferFrom(
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address from,
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address to,
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uint256 value
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) external returns (bool);
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}
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// File: contracts/interfaces/IUniswapV2Factory.sol
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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, uint256);
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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 getPair(address tokenA, address tokenB) external view returns (address pair);
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function allPairs(uint256) external view returns (address pair);
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function allPairsLength() external view returns (uint256);
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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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}
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// File: contracts/interfaces/IUniswapV2Callee.sol
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pragma solidity >=0.5.0;
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interface IUniswapV2Callee {
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function uniswapV2Call(
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address sender,
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uint256 amount0,
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uint256 amount1,
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bytes calldata data
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) external;
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}
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// File: contracts/UniswapV2Pair.sol
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pragma solidity 0.6.9;
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contract UniswapV2Pair is UniswapV2ERC20 {
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using SafeMath for uint256;
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using UQ112x112 for uint224;
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uint256 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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uint256 public price0CumulativeLast;
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uint256 public price1CumulativeLast;
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uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
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uint256 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()
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public
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view
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returns (
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uint112 _reserve0,
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uint112 _reserve1,
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uint32 _blockTimestampLast
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)
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{
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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(
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address token,
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address to,
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uint256 value
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) private {
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(bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
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require(
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success && (data.length == 0 || abi.decode(data, (bool))),
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"UniswapV2: TRANSFER_FAILED"
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);
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}
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event Mint(address indexed sender, uint256 amount0, uint256 amount1);
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event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
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event Swap(
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address indexed sender,
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uint256 amount0In,
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uint256 amount1In,
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uint256 amount0Out,
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uint256 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(
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uint256 balance0,
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uint256 balance1,
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uint112 _reserve0,
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uint112 _reserve1
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) 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 +=
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uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) *
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timeElapsed;
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price1CumulativeLast +=
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uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) *
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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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uint256 _kLast = kLast; // gas savings
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if (feeOn) {
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if (_kLast != 0) {
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uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
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uint256 rootKLast = Math.sqrt(_kLast);
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if (rootK > rootKLast) {
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uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));
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uint256 denominator = rootK.mul(5).add(rootKLast);
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uint256 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 (uint256 liquidity) {
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(uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
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uint256 balance0 = IERC20(token0).balanceOf(address(this));
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uint256 balance1 = IERC20(token1).balanceOf(address(this));
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uint256 amount0 = balance0.sub(_reserve0);
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uint256 amount1 = balance1.sub(_reserve1);
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bool feeOn = _mintFee(_reserve0, _reserve1);
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uint256 _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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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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} else {
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liquidity = Math.min(
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amount0.mul(_totalSupply) / _reserve0,
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amount1.mul(_totalSupply) / _reserve1
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);
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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 = uint256(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 (uint256 amount0, uint256 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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uint256 balance0 = IERC20(_token0).balanceOf(address(this));
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uint256 balance1 = IERC20(_token1).balanceOf(address(this));
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uint256 liquidity = balanceOf[address(this)];
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|
|
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bool feeOn = _mintFee(_reserve0, _reserve1);
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uint256 _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 = IERC20(_token0).balanceOf(address(this));
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balance1 = IERC20(_token1).balanceOf(address(this));
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|
|
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_update(balance0, balance1, _reserve0, _reserve1);
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if (feeOn) kLast = uint256(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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|
|
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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(
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uint256 amount0Out,
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uint256 amount1Out,
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|
address to,
|
|
bytes calldata data
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|
) external lock {
|
|
require(amount0Out > 0 || amount1Out > 0, "UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT");
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|
(uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
|
|
require(
|
|
amount0Out < _reserve0 && amount1Out < _reserve1,
|
|
"UniswapV2: INSUFFICIENT_LIQUIDITY"
|
|
);
|
|
|
|
uint256 balance0;
|
|
uint256 balance1;
|
|
{
|
|
// scope for _token{0,1}, avoids stack too deep errors
|
|
address _token0 = token0;
|
|
address _token1 = token1;
|
|
require(to != _token0 && to != _token1, "UniswapV2: INVALID_TO");
|
|
if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
|
|
if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
|
|
if (data.length > 0)
|
|
IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
|
|
balance0 = IERC20(_token0).balanceOf(address(this));
|
|
balance1 = IERC20(_token1).balanceOf(address(this));
|
|
}
|
|
uint256 amount0In = balance0 > _reserve0 - amount0Out
|
|
? balance0 - (_reserve0 - amount0Out)
|
|
: 0;
|
|
uint256 amount1In = balance1 > _reserve1 - amount1Out
|
|
? balance1 - (_reserve1 - amount1Out)
|
|
: 0;
|
|
require(amount0In > 0 || amount1In > 0, "UniswapV2: INSUFFICIENT_INPUT_AMOUNT");
|
|
{
|
|
// scope for reserve{0,1}Adjusted, avoids stack too deep errors
|
|
uint256 balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
|
|
uint256 balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
|
|
require(
|
|
balance0Adjusted.mul(balance1Adjusted) >=
|
|
uint256(_reserve0).mul(_reserve1).mul(1000**2),
|
|
"UniswapV2: K"
|
|
);
|
|
}
|
|
|
|
_update(balance0, balance1, _reserve0, _reserve1);
|
|
emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
|
|
}
|
|
|
|
// force balances to match reserves
|
|
function skim(address to) external lock {
|
|
address _token0 = token0; // gas savings
|
|
address _token1 = token1; // gas savings
|
|
_safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
|
|
_safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
|
|
}
|
|
|
|
// force reserves to match balances
|
|
function sync() external lock {
|
|
_update(
|
|
IERC20(token0).balanceOf(address(this)),
|
|
IERC20(token1).balanceOf(address(this)),
|
|
reserve0,
|
|
reserve1
|
|
);
|
|
}
|
|
}
|