diff --git a/.env.template b/.env.template
new file mode 100644
index 0000000..b1102ac
--- /dev/null
+++ b/.env.template
@@ -0,0 +1,7 @@
+DEPLOYMENT_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
+WETH_ADDRESS=
+FEE_TO_ADDRESS=0x0000000000000000000000000000000000000000
+
+SEPOLIA_TEST_RPC_URL=
+SEPOLIA_TEST_API_KEY=
+SEPOLIA_TEST_ENDPOINT=https://api-sepolia.etherscan.io/api
diff --git a/.gitignore b/.gitignore
index 85198aa..052b88b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,7 @@ docs/
# Dotenv file
.env
+
+
+# Soldeer
+/dependencies
diff --git a/deployer.sh b/deployer.sh
new file mode 100644
index 0000000..6cdf4ec
--- /dev/null
+++ b/deployer.sh
@@ -0,0 +1,79 @@
+set -e
+
+AVAILIABLE_NETWORKS=(anvil-localnet sepolia-testnet)
+NETWORK="${AVAILIABLE_NETWORKS[0]}"
+START=1
+END=4
+VERIFY_NEEDED="--verify"
+
+while [[ $# -gt 0 ]];
+do
+ case "${1}" in
+ -s|--start)
+ START="$2"
+ shift
+ shift
+ ;;
+ -e|--end)
+ END="$2"
+ shift
+ shift
+ ;;
+ -n|--network)
+ NETWORK="$2"
+ shift
+ shift
+ ;;
+ esac
+done
+
+if [ "$NETWORK" == "anvil-localnet" ]; then
+ VERIFY_NEEDED=""
+fi
+
+found=false
+for i in "${AVAILIABLE_NETWORKS[@]}"
+do
+ if [ "$i" == "$NETWORK" ] ; then
+ found=true
+ fi
+done
+
+if [ $found == false ] ; then
+ echo "ERROR: '${NETWORK}' is incorrect network for deployment, valid networks are:"
+ for i in "${AVAILIABLE_NETWORKS[@]}"
+ do
+ echo -e "\t${i}"
+ done
+ exit
+fi
+
+for i in $(seq $START $END); do
+ if [ "0" == "$i" ]; then
+ CONTRACT="WETH9"
+ elif [ "1" == "$i" ] ; then
+ CONTRACT="UniswapV2Factory"
+ elif [ "2" == "$i" ]; then
+ CONTRACT="UniswapV2Router"
+ else
+ echo "No contract found for index $i"
+ exit
+ fi
+
+ forge script script/${CONTRACT}.s.sol:${CONTRACT}Script --rpc-url $NETWORK
+ if [ "$NETWORK" == "anvil-localnet" ]; then
+ answer="y"
+ else
+ read -p "Do you want to broadcast '${CONTRACT}' to ${NETWORK} (y/N)? " answer
+ fi
+
+ if [ "$answer" != "${answer#[Yy]}" ] ; then
+ forge script script/${CONTRACT}.s.sol:${CONTRACT}Script \
+ --rpc-url $NETWORK \
+ --broadcast \
+ ${VERIFY_NEEDED} \
+ -vvv
+ else
+ exit
+ fi
+done
diff --git a/foundry.toml b/foundry.toml
index 25b918f..0199705 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -1,6 +1,26 @@
[profile.default]
src = "src"
out = "out"
-libs = ["lib"]
+libs = ["lib", "dependencies"]
+solc_version = "0.8.20"
-# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
+optimizer = true
+optimizer_runs = 4294967295
+
+remappings = [
+ "@openzeppelin-contracts/=dependencies/@openzeppelin-contracts-5.3.0/",
+ "forge-std-1.9.2/=dependencies/forge-std-1.9.2/",
+]
+fs_permissions = [{ access = "read", path = "./broadcast"}]
+allow_internal_expect_revert = true
+
+[dependencies]
+forge-std = "1.9.7"
+"@openzeppelin-contracts" = "5.3.0"
+
+[rpc_endpoints]
+anvil-localnet = "http://127.0.0.1:8545"
+sepolia-testnet = "${SEPOLIA_TEST_RPC_URL}"
+
+[etherscan]
+sepolia-testnet = { key = "${SEPOLIA_TEST_API_KEY}", url = "${SEPOLIA_TEST_ENDPOINT}" }
diff --git a/remappings.txt b/remappings.txt
new file mode 100644
index 0000000..97c31a7
--- /dev/null
+++ b/remappings.txt
@@ -0,0 +1,2 @@
+@openzeppelin-contracts-5.3.0/=dependencies/@openzeppelin-contracts-5.3.0/
+forge-std-1.9.7/=dependencies/forge-std-1.9.7/
diff --git a/script/AddressFileRW.sol b/script/AddressFileRW.sol
new file mode 100644
index 0000000..f79c9e3
--- /dev/null
+++ b/script/AddressFileRW.sol
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Script} from "forge-std/Script.sol";
+import {stdJson} from "forge-std/StdJson.sol";
+import "@openzeppelin-contracts/utils/Strings.sol";
+
+contract AddressFileRWScript is Script {
+ using stdJson for string;
+
+ function _readFromFile(string memory fileName) internal view returns (address) {
+ string memory root = vm.projectRoot();
+ string memory path = string.concat(
+ root,
+ "/broadcast/",
+ fileName,
+ ".s.sol/",
+ Strings.toString(block.chainid),
+ "/run-latest.json"
+ );
+ string memory json = vm.readFile(path);
+ bytes memory contractAddress = stdJson.parseRaw(
+ json,
+ ".transactions[0].contractAddress"
+ );
+ return _bytesToAddress(contractAddress);
+ }
+
+ function _uint2str(uint256 _i) internal pure returns (string memory str) {
+ if (_i == 0) {
+ return "0";
+ }
+
+ uint256 j = _i;
+ uint256 length;
+ while (j != 0) {
+ length++;
+ j /= 10;
+ }
+
+ bytes memory bstr = new bytes(length);
+ uint256 k = length;
+ j = _i;
+ while (j != 0) {
+ bstr[--k] = bytes1(uint8(48 + j % 10));
+ j /= 10;
+ }
+ str = string(bstr);
+ }
+
+ function _bytesToAddress(bytes memory bys) internal pure returns (address addr) {
+ assembly {
+ addr := mload(add(bys, 32))
+ }
+ }
+}
diff --git a/script/Counter.s.sol b/script/Counter.s.sol
deleted file mode 100644
index cdc1fe9..0000000
--- a/script/Counter.s.sol
+++ /dev/null
@@ -1,19 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-import {Script, console} from "forge-std/Script.sol";
-import {Counter} from "../src/Counter.sol";
-
-contract CounterScript is Script {
- Counter public counter;
-
- function setUp() public {}
-
- function run() public {
- vm.startBroadcast();
-
- counter = new Counter();
-
- vm.stopBroadcast();
- }
-}
diff --git a/script/UniswapV2Factory.s.sol b/script/UniswapV2Factory.s.sol
new file mode 100644
index 0000000..2cc31bf
--- /dev/null
+++ b/script/UniswapV2Factory.s.sol
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Script,console} from "forge-std/Script.sol";
+import "../src/UniswapV2Factory.sol";
+
+import "./AddressFileRW.sol";
+
+contract UniswapV2FactoryScript is Script {
+ function setUp() public {}
+
+ function run() public {
+ uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
+ address feeToAddress = vm.envAddress("FEE_TO_ADDRESS");
+ address account = vm.addr(privateKey);
+
+ console.log("Deployment Account : ", account);
+ console.log("Fee to Address : ", feeToAddress);
+
+ vm.broadcast(privateKey);
+ UniswapV2Factory factory = new UniswapV2Factory(feeToAddress);
+ console.log("\n\tFactory Address: ", address(factory));
+ }
+}
diff --git a/script/UniswapV2Router.s.sol b/script/UniswapV2Router.s.sol
new file mode 100644
index 0000000..f237aa7
--- /dev/null
+++ b/script/UniswapV2Router.s.sol
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {console} from "forge-std/Script.sol";
+import "../src/UniswapV2Router.sol";
+
+import "./AddressFileRW.sol";
+
+contract UniswapV2RouterScript is AddressFileRWScript {
+ function setUp() public {}
+
+ function run() public {
+ uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
+ address account = vm.addr(privateKey);
+
+ address factoryAddress = _readFromFile("UniswapV2Factory");
+ address wethAddress;
+ try vm.envAddress("WETH_ADDRESS") returns (address maybeWethAddress) {
+ wethAddress = maybeWethAddress;
+ } catch {
+ wethAddress = _readFromFile("WETH9");
+ }
+
+ console.log("Deployment Account : ", account);
+ console.log("WETH9 Address : ", wethAddress);
+ console.log("UniswapV2 Factory : ", factoryAddress);
+
+ vm.broadcast(privateKey);
+ UniswapV2Router router = new UniswapV2Router(factoryAddress, wethAddress);
+ console.log("\n\tRouter Address: ", address(router));
+ }
+}
diff --git a/script/WETH9.s.sol b/script/WETH9.s.sol
new file mode 100644
index 0000000..32a7ac8
--- /dev/null
+++ b/script/WETH9.s.sol
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Script,console} from "forge-std/Script.sol";
+import "../src/WETH9.sol";
+
+contract WETH9Script is Script {
+ function setUp() public {}
+
+ function run() public {
+ uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
+ address account = vm.addr(privateKey);
+ console.log("Deployment Account : ", account);
+
+ vm.broadcast(privateKey);
+ WETH9 weth = new WETH9();
+ console.log("\n\tWETH9 Address: ", address(weth));
+ }
+}
diff --git a/soldeer.lock b/soldeer.lock
new file mode 100644
index 0000000..f274bd0
--- /dev/null
+++ b/soldeer.lock
@@ -0,0 +1,13 @@
+[[dependencies]]
+name = "@openzeppelin-contracts"
+version = "5.3.0"
+url = "https://soldeer-revisions.s3.amazonaws.com/@openzeppelin-contracts/5_3_0_10-04-2025_10:51:50_contracts.zip"
+checksum = "fa2bc3db351137c4d5eb32b738a814a541b78e87fbcbfeca825e189c4c787153"
+integrity = "d69addf252dfe0688dcd893a7821cbee2421f8ce53d95ca0845a59530043cfd1"
+
+[[dependencies]]
+name = "forge-std"
+version = "1.9.7"
+url = "https://soldeer-revisions.s3.amazonaws.com/forge-std/1_9_7_28-04-2025_15:55:08_forge-std-1.9.zip"
+checksum = "8d9e0a885fa8ee6429a4d344aeb6799119f6a94c7c4fe6f188df79b0dce294ba"
+integrity = "9e60fdba82bc374df80db7f2951faff6467b9091873004a3d314cf0c084b3c7d"
diff --git a/src/Counter.sol b/src/Counter.sol
deleted file mode 100644
index aded799..0000000
--- a/src/Counter.sol
+++ /dev/null
@@ -1,14 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-contract Counter {
- uint256 public number;
-
- function setNumber(uint256 newNumber) public {
- number = newNumber;
- }
-
- function increment() public {
- number++;
- }
-}
diff --git a/src/UniswapV2ERC20.sol b/src/UniswapV2ERC20.sol
new file mode 100644
index 0000000..219e955
--- /dev/null
+++ b/src/UniswapV2ERC20.sol
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "./interfaces/IUniswapV2ERC20.sol";
+
+contract UniswapV2ERC20 is IUniswapV2ERC20 {
+ string public constant override name = "Uniswap V2";
+ string public constant override symbol = "UNI-V2";
+ uint8 public constant override decimals = 18;
+ uint256 public override totalSupply;
+ mapping(address => uint256) public override balanceOf;
+ mapping(address => mapping(address => uint256)) public override allowance;
+
+ bytes32 public override DOMAIN_SEPARATOR;
+ // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
+ bytes32 public constant override PERMIT_TYPEHASH =
+ 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
+ mapping(address => uint256) public override nonces;
+
+ constructor() {
+ DOMAIN_SEPARATOR = keccak256(
+ abi.encode(
+ keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
+ keccak256(bytes(name)),
+ keccak256(bytes("1")),
+ block.chainid,
+ address(this)
+ )
+ );
+ }
+
+ function _mint(address to, uint256 value) internal {
+ totalSupply += value;
+ balanceOf[to] += value;
+ emit Transfer(address(0), to, value);
+ }
+
+ function _burn(address from, uint256 value) internal {
+ balanceOf[from] -= value;
+ totalSupply -= value;
+ emit Transfer(from, address(0), value);
+ }
+
+ function _approve(address owner, address spender, uint256 value) private {
+ allowance[owner][spender] = value;
+ emit Approval(owner, spender, value);
+ }
+
+ function _transfer(address from, address to, uint256 value) private {
+ balanceOf[from] -= value;
+ balanceOf[to] += value;
+ emit Transfer(from, to, value);
+ }
+
+ function approve(
+ address spender,
+ uint256 value
+ ) external override returns (bool) {
+ _approve(msg.sender, spender, value);
+ return true;
+ }
+
+ function transfer(
+ address to,
+ uint256 value
+ ) external override returns (bool) {
+ _transfer(msg.sender, to, value);
+ return true;
+ }
+
+ function transferFrom(
+ address from,
+ address to,
+ uint256 value
+ ) external override returns (bool) {
+ if (allowance[from][msg.sender] != type(uint256).max) {
+ allowance[from][msg.sender] -= value;
+ }
+ _transfer(from, to, value);
+ return true;
+ }
+
+ function permit(
+ address owner,
+ address spender,
+ uint256 value,
+ uint256 deadline,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external override {
+ if (deadline < block.timestamp) revert("UniswapV2: EXPIRED");
+ bytes32 digest = keccak256(
+ abi.encodePacked(
+ "\x19\x01",
+ DOMAIN_SEPARATOR,
+ keccak256(
+ abi.encode(
+ PERMIT_TYPEHASH,
+ owner,
+ spender,
+ value,
+ nonces[owner]++,
+ deadline
+ )
+ )
+ )
+ );
+ address recoveredAddress = ecrecover(digest, v, r, s);
+ if (recoveredAddress == address(0) || recoveredAddress != owner) revert("UniswapV2: INVALID_SIGNATURE");
+ _approve(owner, spender, value);
+ }
+}
diff --git a/src/UniswapV2Factory.sol b/src/UniswapV2Factory.sol
new file mode 100644
index 0000000..cf335e4
--- /dev/null
+++ b/src/UniswapV2Factory.sol
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "./interfaces/IUniswapV2Factory.sol";
+import "./interfaces/IUniswapV2Pair.sol";
+import "./UniswapV2Pair.sol";
+
+contract UniswapV2Factory is IUniswapV2Factory {
+ bytes32 public constant PAIR_HASH = keccak256(type(UniswapV2Pair).creationCode);
+
+ address public override feeTo;
+ address public override feeToSetter;
+
+ mapping(address => mapping(address => address)) public override getPair;
+ address[] public override allPairs;
+
+ constructor(address _feeToSetter) {
+ feeToSetter = _feeToSetter;
+ }
+
+ function allPairsLength() external view override returns (uint256) {
+ return allPairs.length;
+ }
+
+ function createPair(
+ address tokenA,
+ address tokenB
+ ) external override returns (address pair) {
+ if (tokenA == tokenB) revert("UniswapV2: IDENTICAL_ADDRESSES");
+ (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
+ if (token0 == address(0)) revert("UniswapV2: ZERO_ADDRESS");
+ if (getPair[token0][token1] != address(0)) revert("UniswapV2: PAIR_EXISTS");
+
+ bytes memory bytecode = type(UniswapV2Pair).creationCode;
+ bytes32 salt = keccak256(abi.encodePacked(token0, token1));
+ assembly {
+ pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
+ }
+
+ IUniswapV2Pair(pair).initialize(token0, token1);
+ getPair[token0][token1] = pair;
+ getPair[token1][token0] = pair; // populate mapping in the reverse direction
+ allPairs.push(pair);
+ emit PairCreated(token0, token1, pair, allPairs.length);
+ }
+
+ function setFeeTo(address _feeTo) external override {
+ if (msg.sender != feeToSetter) revert("UniswapV2: FORBIDDEN");
+ feeTo = _feeTo;
+ }
+
+ function setFeeToSetter(address _feeToSetter) external override {
+ if (msg.sender != feeToSetter) revert("UniswapV2: FORBIDDEN");
+ feeToSetter = _feeToSetter;
+ }
+}
diff --git a/src/UniswapV2Pair.sol b/src/UniswapV2Pair.sol
new file mode 100644
index 0000000..043b6f8
--- /dev/null
+++ b/src/UniswapV2Pair.sol
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "./UniswapV2ERC20.sol";
+
+import "./interfaces/IUniswapV2Pair.sol";
+import "./interfaces/IUniswapV2Factory.sol";
+import "./interfaces/IUniswapV2Callee.sol";
+import "./interfaces/IERC20.sol";
+
+import "./libraries/Math.sol";
+import "./libraries/UQ112x112.sol";
+import "./libraries/TransferHelper.sol";
+
+contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
+ using UQ112x112 for uint224;
+
+ uint256 public constant override MINIMUM_LIQUIDITY = 10 ** 3;
+
+ address public override factory;
+ address public override token0;
+ address public override token1;
+
+ uint112 private reserve0; // uses single storage slot, accessible via getReserves
+ uint112 private reserve1; // uses single storage slot, accessible via getReserves
+ uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves
+
+ uint256 public override price0CumulativeLast;
+ uint256 public override price1CumulativeLast;
+ uint256 public override kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
+
+ uint256 private unlocked = 1;
+ modifier lock() {
+ if (unlocked == 0) revert("UniswapV2: LOCKED");
+ unlocked = 0;
+ _;
+ unlocked = 1;
+ }
+
+ function getReserves()
+ public
+ view
+ override
+ returns (
+ uint112 _reserve0,
+ uint112 _reserve1,
+ uint32 _blockTimestampLast
+ )
+ {
+ _reserve0 = reserve0;
+ _reserve1 = reserve1;
+ _blockTimestampLast = blockTimestampLast;
+ }
+
+ constructor() {
+ factory = msg.sender;
+ }
+
+ function initialize(address _token0, address _token1) external override {
+ if (msg.sender != factory) revert("UniswapV2: FORBIDDEN"); // sufficient check
+ token0 = _token0;
+ token1 = _token1;
+ }
+
+ function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
+ if (balance0 > type(uint112).max || balance1 > type(uint112).max) revert("UniswapV2: OVERFLOW");
+ uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
+ unchecked {
+ uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
+ if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
+ price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
+ price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
+ }
+ }
+ reserve0 = uint112(balance0);
+ reserve1 = uint112(balance1);
+ blockTimestampLast = blockTimestamp;
+ emit Sync(reserve0, reserve1);
+ }
+
+ function _mintFee(
+ uint112 _reserve0,
+ uint112 _reserve1
+ ) private returns (bool feeOn) {
+ address feeTo = IUniswapV2Factory(factory).feeTo();
+ feeOn = feeTo != address(0);
+ uint256 _kLast = kLast; // gas savings
+ if (feeOn) {
+ if (_kLast != 0) {
+ uint256 rootK = UniswapV2Math.sqrt(uint256(_reserve0) * _reserve1);
+ uint256 rootKLast = UniswapV2Math.sqrt(_kLast);
+ if (rootK > rootKLast) {
+ uint256 numerator = totalSupply * (rootK - rootKLast);
+ uint256 denominator = rootK * 5 + rootKLast;
+ uint256 liquidity = numerator / denominator;
+ if (liquidity > 0) _mint(feeTo, liquidity);
+ }
+ }
+ } else if (_kLast != 0) {
+ kLast = 0;
+ }
+ }
+
+ function mint(address to) external override lock returns (uint256 liquidity) {
+ (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
+ uint256 balance0 = IERC20(token0).balanceOf(address(this));
+ uint256 balance1 = IERC20(token1).balanceOf(address(this));
+ uint256 amount0 = balance0 - _reserve0;
+ uint256 amount1 = balance1 - _reserve1;
+
+ bool feeOn = _mintFee(_reserve0, _reserve1);
+ uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
+ if (_totalSupply == 0) {
+ liquidity = UniswapV2Math.sqrt(amount0 * amount1) - MINIMUM_LIQUIDITY;
+ _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
+ } else {
+ liquidity = UniswapV2Math.min(amount0 * _totalSupply / _reserve0, amount1 * _totalSupply / _reserve1);
+ }
+ if (liquidity == 0) revert("UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED");
+ _mint(to, liquidity);
+ _update(balance0, balance1, _reserve0, _reserve1);
+
+ if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
+ emit Mint(msg.sender, amount0, amount1);
+ }
+
+ function burn(address to) external override lock returns (uint256 amount0, uint256 amount1) {
+ (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
+ address _token0 = token0; // gas savings
+ address _token1 = token1; // gas savings
+ uint256 balance0 = IERC20(_token0).balanceOf(address(this));
+ uint256 balance1 = IERC20(_token1).balanceOf(address(this));
+ uint256 liquidity = balanceOf[address(this)];
+
+ bool feeOn = _mintFee(_reserve0, _reserve1);
+ uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
+ amount0 = (liquidity * balance0) / _totalSupply; // using balances ensures pro-rata distribution
+ amount1 = (liquidity * balance1) / _totalSupply; // using balances ensures pro-rata distribution
+ if (amount0 == 0 || amount1 == 0) revert("UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED");
+ _burn(address(this), liquidity);
+ TransferHelper.safeTransfer(_token0, to, amount0);
+ TransferHelper.safeTransfer(_token1, to, amount1);
+ balance0 = IERC20(_token0).balanceOf(address(this));
+ balance1 = IERC20(_token1).balanceOf(address(this));
+
+ _update(balance0, balance1, _reserve0, _reserve1);
+ if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
+ emit Burn(msg.sender, amount0, amount1, to);
+ }
+
+ function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external override lock {
+ if (amount0Out == 0 && amount1Out == 0) revert("UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT");
+ (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
+ if (amount0Out >= _reserve0 || amount1Out >= _reserve1) revert("UniswapV2: INSUFFICIENT_LIQUIDITY");
+
+ uint256 balance0;
+ uint256 balance1;
+ {
+ // scope for _token{0,1}, avoids stack too deep errors
+ address _token0 = token0;
+ address _token1 = token1;
+ if (to == _token0 || to == _token1) revert("UniswapV2: INVALID_TO");
+ if (amount0Out > 0) TransferHelper.safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
+ if (amount1Out > 0) TransferHelper.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;
+ if (amount0In == 0 && amount1In == 0) revert("UniswapV2: INSUFFICIENT_INPUT_AMOUNT");
+ {
+ // scope for reserve{0,1}Adjusted, avoids stack too deep errors
+ uint256 balance0Adjusted = balance0 * 1000 - amount0In * 3;
+ uint256 balance1Adjusted = balance1 * 1000 - amount1In * 3;
+ if (balance0Adjusted * balance1Adjusted < uint256(_reserve0) * uint256(_reserve1) * 1e6) {
+ revert("UniswapV2: K");
+ }
+ }
+
+ _update(balance0, balance1, _reserve0, _reserve1);
+ emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
+ }
+
+ function skim(address to) external override lock {
+ address _token0 = token0; // gas savings
+ address _token1 = token1; // gas savings
+ TransferHelper.safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)) - reserve0);
+ TransferHelper.safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)) - reserve1);
+ }
+
+ function sync() external override lock {
+ _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
+ }
+}
diff --git a/src/UniswapV2Router.sol b/src/UniswapV2Router.sol
new file mode 100644
index 0000000..00962e8
--- /dev/null
+++ b/src/UniswapV2Router.sol
@@ -0,0 +1,604 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "./interfaces/IUniswapV2Factory.sol";
+import "./interfaces/IUniswapV2Router.sol";
+import "./interfaces/IUniswapV2Pair.sol";
+import "./interfaces/IWETH.sol";
+import "./interfaces/IERC20.sol";
+
+import {TransferHelper} from "./libraries/TransferHelper.sol";
+import {UniswapV2Library} from "./libraries/UniswapV2Library.sol";
+
+contract UniswapV2Router is IUniswapV2Router {
+ //solhint-disable-next-line immutable-vars-naming
+ address public immutable override factory;
+ address public immutable override WETH;
+
+ modifier ensure(uint256 deadline) {
+ if (deadline < block.timestamp) revert("UniswapV2Router: EXPIRED");
+ _;
+ }
+
+ constructor(address _factory, address _WETH) {
+ factory = _factory;
+ WETH = _WETH;
+ }
+
+ receive() external payable {
+ assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
+ }
+
+ // **** ADD LIQUIDITY ****
+ function _addLiquidity(
+ address tokenA,
+ address tokenB,
+ uint256 amountADesired,
+ uint256 amountBDesired,
+ uint256 amountAMin,
+ uint256 amountBMin
+ ) internal virtual returns (uint256 amountA, uint256 amountB) {
+ // create the pair if it doesn't exist yet
+ if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
+ IUniswapV2Factory(factory).createPair(tokenA, tokenB);
+ }
+ (uint256 reserveA, uint256 reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);
+ if (reserveA == 0 && reserveB == 0) {
+ (amountA, amountB) = (amountADesired, amountBDesired);
+ } else {
+ uint256 amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);
+ if (amountBOptimal <= amountBDesired) {
+ if (amountBOptimal < amountBMin) revert("UniswapV2Router: INSUFFICIENT_B_AMOUNT");
+ (amountA, amountB) = (amountADesired, amountBOptimal);
+ } else {
+ uint256 amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);
+ assert(amountAOptimal <= amountADesired);
+ if (amountAOptimal < amountAMin) revert("UniswapV2Router: INSUFFICIENT_A_AMOUNT");
+ (amountA, amountB) = (amountAOptimal, amountBDesired);
+ }
+ }
+ }
+
+ function addLiquidity(
+ address tokenA,
+ address tokenB,
+ uint256 amountADesired,
+ uint256 amountBDesired,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline
+ )
+ external
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256 amountA, uint256 amountB, uint256 liquidity)
+ {
+ (amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
+ address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
+ TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
+ TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
+ liquidity = IUniswapV2Pair(pair).mint(to);
+ }
+
+ function addLiquidityETH(
+ address token,
+ uint256 amountTokenDesired,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ )
+ external
+ payable
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256 amountToken, uint256 amountETH, uint256 liquidity)
+ {
+ (amountToken, amountETH) = _addLiquidity(
+ token,
+ WETH,
+ amountTokenDesired,
+ msg.value,
+ amountTokenMin,
+ amountETHMin
+ );
+ address pair = UniswapV2Library.pairFor(factory, token, WETH);
+ TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
+
+ IWETH(WETH).deposit{value: amountETH}();
+ assert(IWETH(WETH).transfer(pair, amountETH));
+
+ liquidity = IUniswapV2Pair(pair).mint(to);
+ // refund dust eth, if any
+ if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
+ }
+
+ // **** REMOVE LIQUIDITY ****
+ function removeLiquidity(
+ address tokenA,
+ address tokenB,
+ uint256 liquidity,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline
+ )
+ public
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256 amountA, uint256 amountB)
+ {
+ address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
+ IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
+ (uint256 amount0, uint256 amount1) = IUniswapV2Pair(pair).burn(to);
+ (address token0, ) = UniswapV2Library.sortTokens(tokenA, tokenB);
+ (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
+ if (amountA < amountAMin) revert("UniswapV2Router: INSUFFICIENT_A_AMOUNT");
+ if (amountB < amountBMin) revert("UniswapV2Router: INSUFFICIENT_B_AMOUNT");
+ }
+
+ function removeLiquidityETH(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ )
+ public
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256 amountToken, uint256 amountETH)
+ {
+ (amountToken, amountETH) = removeLiquidity(
+ token,
+ WETH,
+ liquidity,
+ amountTokenMin,
+ amountETHMin,
+ address(this),
+ deadline
+ );
+ TransferHelper.safeTransfer(token, to, amountToken);
+ IWETH(WETH).withdraw(amountETH);
+ TransferHelper.safeTransferETH(to, amountETH);
+ }
+
+ function removeLiquidityWithPermit(
+ address tokenA,
+ address tokenB,
+ uint256 liquidity,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external virtual override returns (uint256 amountA, uint256 amountB) {
+ address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
+ uint256 value = approveMax ? type(uint256).max : liquidity;
+ IUniswapV2Pair(pair).permit(
+ msg.sender,
+ address(this),
+ value,
+ deadline,
+ v,
+ r,
+ s
+ );
+ (amountA, amountB) = removeLiquidity(
+ tokenA,
+ tokenB,
+ liquidity,
+ amountAMin,
+ amountBMin,
+ to,
+ deadline
+ );
+ }
+
+ function removeLiquidityETHWithPermit(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ )
+ external
+ virtual
+ override
+ returns (uint256 amountToken, uint256 amountETH)
+ {
+ address pair = UniswapV2Library.pairFor(factory, token, WETH);
+ uint256 value = approveMax ? type(uint256).max : liquidity;
+ IUniswapV2Pair(pair).permit(
+ msg.sender,
+ address(this),
+ value,
+ deadline,
+ v,
+ r,
+ s
+ );
+ (amountToken, amountETH) = removeLiquidityETH(
+ token,
+ liquidity,
+ amountTokenMin,
+ amountETHMin,
+ to,
+ deadline
+ );
+ }
+
+ // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
+ function removeLiquidityETHSupportingFeeOnTransferTokens(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ ) public virtual override ensure(deadline) returns (uint256 amountETH) {
+ (, amountETH) = removeLiquidity(
+ token,
+ WETH,
+ liquidity,
+ amountTokenMin,
+ amountETHMin,
+ address(this),
+ deadline
+ );
+ TransferHelper.safeTransfer(token, to, IERC20(token).balanceOf(address(this)));
+ IWETH(WETH).withdraw(amountETH);
+ TransferHelper.safeTransferETH(to, amountETH);
+ }
+
+ function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external virtual override returns (uint256 amountETH) {
+ address pair = UniswapV2Library.pairFor(factory, token, WETH);
+ uint256 value = approveMax ? type(uint256).max : liquidity;
+ IUniswapV2Pair(pair).permit(
+ msg.sender,
+ address(this),
+ value,
+ deadline,
+ v,
+ r,
+ s
+ );
+ amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
+ token,
+ liquidity,
+ amountTokenMin,
+ amountETHMin,
+ to,
+ deadline
+ );
+ }
+
+ // **** SWAP ****
+ // requires the initial amount to have already been sent to the first pair
+ function _swap(
+ uint256[] memory amounts,
+ address[] memory path,
+ address _to
+ ) internal virtual {
+ for (uint256 i; i < path.length - 1; i++) {
+ (address input, address output) = (path[i], path[i + 1]);
+ (address token0, ) = UniswapV2Library.sortTokens(input, output);
+ uint256 amountOut = amounts[i + 1];
+ (uint256 amount0Out, uint256 amount1Out) = input == token0
+ ? (uint256(0), amountOut)
+ : (amountOut, uint256(0));
+ address to = i < path.length - 2
+ ? UniswapV2Library.pairFor(factory, output, path[i + 2])
+ : _to;
+ IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output)).swap(
+ amount0Out, amount1Out, to, new bytes(0)
+ );
+ }
+ }
+
+ function swapExactTokensForTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
+ if (amounts[amounts.length - 1] < amountOutMin)
+ revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amounts[0]
+ );
+ _swap(amounts, path, to);
+ }
+
+ function swapTokensForExactTokens(
+ uint256 amountOut,
+ uint256 amountInMax,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
+ if (amounts[0] > amountInMax) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amounts[0]
+ );
+ _swap(amounts, path, to);
+ }
+
+ function swapExactETHForTokens(
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ payable
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
+ if (amounts[amounts.length - 1] < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ IWETH(WETH).deposit{value: amounts[0]}();
+ assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
+ _swap(amounts, path, to);
+ }
+
+ function swapTokensForExactETH(
+ uint256 amountOut,
+ uint256 amountInMax,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
+ if (amounts[0] > amountInMax) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amounts[0]
+ );
+ _swap(amounts, path, address(this));
+ IWETH(WETH).withdraw(amounts[amounts.length - 1]);
+ TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
+ }
+
+ function swapExactTokensForETH(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
+ if (amounts[amounts.length - 1] < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amounts[0]
+ );
+ _swap(amounts, path, address(this));
+ IWETH(WETH).withdraw(amounts[amounts.length - 1]);
+ TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
+ }
+
+ function swapETHForExactTokens(
+ uint256 amountOut,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ )
+ external
+ payable
+ virtual
+ override
+ ensure(deadline)
+ returns (uint256[] memory amounts)
+ {
+ if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
+ if (amounts[0] > msg.value) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
+ IWETH(WETH).deposit{value: amounts[0]}();
+ assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
+ _swap(amounts, path, to);
+ // refund dust eth, if any
+ if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
+ }
+
+ // **** SWAP (supporting fee-on-transfer tokens) ****
+ // requires the initial amount to have already been sent to the first pair
+ function _swapSupportingFeeOnTransferTokens(
+ address[] memory path,
+ address _to
+ ) internal virtual {
+ for (uint256 i; i < path.length - 1; i++) {
+ (address input, address output) = (path[i], path[i + 1]);
+ (address token0, ) = UniswapV2Library.sortTokens(input, output);
+ IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output));
+ uint256 amountInput;
+ uint256 amountOutput;
+ {
+ // scope to avoid stack too deep errors
+ (uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
+ (uint256 reserveInput, uint256 reserveOutput) = input == token0
+ ? (reserve0, reserve1)
+ : (reserve1, reserve0);
+ amountInput =
+ IERC20(input).balanceOf(address(pair)) -
+ reserveInput;
+ amountOutput = UniswapV2Library.getAmountOut(
+ amountInput,
+ reserveInput,
+ reserveOutput
+ );
+ }
+ (uint256 amount0Out, uint256 amount1Out) = input == token0
+ ? (uint256(0), amountOutput)
+ : (amountOutput, uint256(0));
+ address to = i < path.length - 2
+ ? UniswapV2Library.pairFor(factory, output, path[i + 2])
+ : _to;
+ pair.swap(amount0Out, amount1Out, to, new bytes(0));
+ }
+ }
+
+ function swapExactTokensForTokensSupportingFeeOnTransferTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external virtual override ensure(deadline) {
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amountIn
+ );
+ uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
+ _swapSupportingFeeOnTransferTokens(path, to);
+ if (IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore < amountOutMin) {
+ revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ }
+ }
+
+ function swapExactETHForTokensSupportingFeeOnTransferTokens(
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external payable virtual override ensure(deadline) {
+ if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ uint256 amountIn = msg.value;
+ IWETH(WETH).deposit{value: amountIn}();
+ assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
+ uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
+ _swapSupportingFeeOnTransferTokens(path, to);
+ if (IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore < amountOutMin) {
+ revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ }
+ }
+
+ function swapExactTokensForETHSupportingFeeOnTransferTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external virtual override ensure(deadline) {
+ if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
+ TransferHelper.safeTransferFrom(
+ path[0],
+ msg.sender,
+ UniswapV2Library.pairFor(factory, path[0], path[1]),
+ amountIn
+ );
+ _swapSupportingFeeOnTransferTokens(path, address(this));
+ uint256 amountOut = IERC20(WETH).balanceOf(address(this));
+ if (amountOut < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
+ IWETH(WETH).withdraw(amountOut);
+ TransferHelper.safeTransferETH(to, amountOut);
+ }
+
+ // **** LIBRARY FUNCTIONS ****
+ function quote(
+ uint256 amountA,
+ uint256 reserveA,
+ uint256 reserveB
+ ) public pure virtual override returns (uint256 amountB) {
+ return UniswapV2Library.quote(amountA, reserveA, reserveB);
+ }
+
+ function getAmountOut(
+ uint256 amountIn,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) public pure virtual override returns (uint256 amountOut) {
+ return UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
+ }
+
+ function getAmountIn(
+ uint256 amountOut,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) public pure virtual override returns (uint256 amountIn) {
+ return UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
+ }
+
+ function getAmountsOut(
+ uint256 amountIn,
+ address[] memory path
+ ) public view virtual override returns (uint256[] memory amounts) {
+ return UniswapV2Library.getAmountsOut(factory, amountIn, path);
+ }
+
+ function getAmountsIn(
+ uint256 amountOut,
+ address[] memory path
+ ) public view virtual override returns (uint256[] memory amounts) {
+ return UniswapV2Library.getAmountsIn(factory, amountOut, path);
+ }
+}
diff --git a/src/WETH9.sol b/src/WETH9.sol
new file mode 100644
index 0000000..bf2c70c
--- /dev/null
+++ b/src/WETH9.sol
@@ -0,0 +1,760 @@
+// Copyright (C) 2015, 2016, 2017 Dapphub
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see .
+
+pragma solidity =0.8.20;
+
+contract WETH9 {
+ string public name = "Wrapped Ether";
+ string public symbol = "WETH";
+ uint8 public decimals = 18;
+
+ event Approval(address indexed src, address indexed guy, uint wad);
+ event Transfer(address indexed src, address indexed dst, uint wad);
+ event Deposit(address indexed dst, uint wad);
+ event Withdrawal(address indexed src, uint wad);
+
+ mapping (address => uint) public balanceOf;
+ mapping (address => mapping (address => uint)) public allowance;
+
+ fallback() external payable {
+ deposit();
+ }
+ receive() external payable {
+ deposit();
+ }
+ function deposit() public payable {
+ balanceOf[msg.sender] += msg.value;
+ emit Deposit(msg.sender, msg.value);
+ }
+ function withdraw(uint wad) public {
+ require(balanceOf[msg.sender] >= wad);
+ balanceOf[msg.sender] -= wad;
+ (bool sent,) = msg.sender.call{value: wad}("");
+ require(sent);
+ emit Withdrawal(msg.sender, wad);
+ }
+
+ function totalSupply() public view returns (uint) {
+ return address(this).balance;
+ }
+
+ function approve(address guy, uint wad) public returns (bool) {
+ allowance[msg.sender][guy] = wad;
+ emit Approval(msg.sender, guy, wad);
+ return true;
+ }
+
+ function transfer(address dst, uint wad) public returns (bool) {
+ return transferFrom(msg.sender, dst, wad);
+ }
+
+ function transferFrom(address src, address dst, uint wad)
+ public
+ returns (bool)
+ {
+ require(balanceOf[src] >= wad);
+
+ if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
+ require(allowance[src][msg.sender] >= wad);
+ allowance[src][msg.sender] -= wad;
+ }
+
+ balanceOf[src] -= wad;
+ balanceOf[dst] += wad;
+
+ emit Transfer(src, dst, wad);
+
+ return true;
+ }
+}
+
+
+/*
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+
+ Copyright (C)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see .
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ Copyright (C)
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+.
+
+*/
diff --git a/src/interfaces/IERC20.sol b/src/interfaces/IERC20.sol
new file mode 100644
index 0000000..5a511d3
--- /dev/null
+++ b/src/interfaces/IERC20.sol
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IERC20 {
+ event Approval(address indexed owner, address indexed spender, uint256 value);
+ event Transfer(address indexed from, address indexed to, uint256 value);
+
+ function name() external view returns (string memory);
+ function symbol() external view returns (string memory);
+ function decimals() external view returns (uint8);
+ function totalSupply() external view returns (uint256);
+ function balanceOf(address owner) external view returns (uint256);
+
+ function allowance(
+ address owner,
+ address spender
+ ) external view returns (uint256);
+
+ function approve(address spender, uint256 value) external returns (bool);
+ function transfer(address to, uint256 value) external returns (bool);
+ function transferFrom(
+ address from,
+ address to,
+ uint256 value
+ ) external returns (bool);
+}
diff --git a/src/interfaces/IUniswapV2Callee.sol b/src/interfaces/IUniswapV2Callee.sol
new file mode 100644
index 0000000..1c25e84
--- /dev/null
+++ b/src/interfaces/IUniswapV2Callee.sol
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IUniswapV2Callee {
+ function uniswapV2Call(
+ address sender,
+ uint256 amount0,
+ uint256 amount1,
+ bytes calldata data
+ ) external;
+}
diff --git a/src/interfaces/IUniswapV2ERC20.sol b/src/interfaces/IUniswapV2ERC20.sol
new file mode 100644
index 0000000..525b3af
--- /dev/null
+++ b/src/interfaces/IUniswapV2ERC20.sol
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IUniswapV2ERC20 {
+ event Approval(address indexed owner, address indexed spender, uint256 value);
+ event Transfer(address indexed from, address indexed to, uint256 value);
+
+ function name() external pure returns (string memory);
+ function symbol() external pure returns (string memory);
+ function decimals() external pure returns (uint8);
+ function totalSupply() external view returns (uint256);
+ function balanceOf(address owner) external view returns (uint256);
+
+ function allowance(address owner,address spender) external view returns (uint256);
+ function approve(address spender, uint256 value) external returns (bool);
+ function transfer(address to, uint256 value) external returns (bool);
+
+ function transferFrom(
+ address from,
+ address to,
+ uint256 value
+ ) external returns (bool);
+
+ function DOMAIN_SEPARATOR() external view returns (bytes32);
+ function PERMIT_TYPEHASH() external pure returns (bytes32);
+ function nonces(address owner) external view returns (uint256);
+
+ function permit(
+ address owner,
+ address spender,
+ uint256 value,
+ uint256 deadline,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external;
+}
diff --git a/src/interfaces/IUniswapV2Factory.sol b/src/interfaces/IUniswapV2Factory.sol
new file mode 100644
index 0000000..62c4516
--- /dev/null
+++ b/src/interfaces/IUniswapV2Factory.sol
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IUniswapV2Factory {
+ event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
+
+ function feeTo() external view returns (address);
+ function feeToSetter() external view returns (address);
+
+ function getPair(address tokenA, address tokenB) external view returns (address pair);
+ function allPairs(uint256) external view returns (address pair);
+ function allPairsLength() external view returns (uint256);
+ function createPair(address tokenA, address tokenB) external returns (address pair);
+
+ function setFeeTo(address) external;
+ function setFeeToSetter(address) external;
+}
diff --git a/src/interfaces/IUniswapV2Pair.sol b/src/interfaces/IUniswapV2Pair.sol
new file mode 100644
index 0000000..eaba6bf
--- /dev/null
+++ b/src/interfaces/IUniswapV2Pair.sol
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "./IUniswapV2ERC20.sol";
+
+interface IUniswapV2Pair is IUniswapV2ERC20 {
+ event Mint(address indexed sender, uint256 amount0, uint256 amount1);
+ event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
+ event Swap(
+ address indexed sender,
+ uint256 amount0In,
+ uint256 amount1In,
+ uint256 amount0Out,
+ uint256 amount1Out,
+ address indexed to
+ );
+ event Sync(uint112 reserve0, uint112 reserve1);
+
+ function MINIMUM_LIQUIDITY() external pure returns (uint256);
+ function factory() external view returns (address);
+ function token0() external view returns (address);
+ function token1() external view returns (address);
+
+ function getReserves()
+ external
+ view
+ returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
+
+ function price0CumulativeLast() external view returns (uint256);
+ function price1CumulativeLast() external view returns (uint256);
+ function kLast() external view returns (uint256);
+
+ function mint(address to) external returns (uint256 liquidity);
+ function burn(address to) external returns (uint256 amount0, uint256 amount1);
+
+ function swap(
+ uint256 amount0Out,
+ uint256 amount1Out,
+ address to,
+ bytes calldata data
+ ) external;
+
+ function skim(address to) external;
+ function sync() external;
+ function initialize(address, address) external;
+}
diff --git a/src/interfaces/IUniswapV2Router.sol b/src/interfaces/IUniswapV2Router.sol
new file mode 100644
index 0000000..e7d71e0
--- /dev/null
+++ b/src/interfaces/IUniswapV2Router.sol
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import {IUniswapV2Router01} from "./IUniswapV2Router01.sol";
+
+interface IUniswapV2Router is IUniswapV2Router01 {
+ function removeLiquidityETHSupportingFeeOnTransferTokens(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ ) external returns (uint256 amountETH);
+
+ function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external returns (uint256 amountETH);
+
+ function swapExactTokensForTokensSupportingFeeOnTransferTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external;
+
+ function swapExactETHForTokensSupportingFeeOnTransferTokens(
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external payable;
+
+ function swapExactTokensForETHSupportingFeeOnTransferTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external;
+}
diff --git a/src/interfaces/IUniswapV2Router01.sol b/src/interfaces/IUniswapV2Router01.sol
new file mode 100644
index 0000000..ada6380
--- /dev/null
+++ b/src/interfaces/IUniswapV2Router01.sol
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IUniswapV2Router01 {
+ function factory() external view returns (address);
+
+ function WETH() external view returns (address);
+
+ function addLiquidity(
+ address tokenA,
+ address tokenB,
+ uint256 amountADesired,
+ uint256 amountBDesired,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline
+ ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
+
+ function addLiquidityETH(
+ address token,
+ uint256 amountTokenDesired,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ )
+ external
+ payable
+ returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
+
+ function removeLiquidity(
+ address tokenA,
+ address tokenB,
+ uint256 liquidity,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline
+ ) external returns (uint256 amountA, uint256 amountB);
+
+ function removeLiquidityETH(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline
+ ) external returns (uint256 amountToken, uint256 amountETH);
+
+ function removeLiquidityWithPermit(
+ address tokenA,
+ address tokenB,
+ uint256 liquidity,
+ uint256 amountAMin,
+ uint256 amountBMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external returns (uint256 amountA, uint256 amountB);
+
+ function removeLiquidityETHWithPermit(
+ address token,
+ uint256 liquidity,
+ uint256 amountTokenMin,
+ uint256 amountETHMin,
+ address to,
+ uint256 deadline,
+ bool approveMax,
+ uint8 v,
+ bytes32 r,
+ bytes32 s
+ ) external returns (uint256 amountToken, uint256 amountETH);
+
+ function swapExactTokensForTokens(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external returns (uint256[] memory amounts);
+
+ function swapTokensForExactTokens(
+ uint256 amountOut,
+ uint256 amountInMax,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external returns (uint256[] memory amounts);
+
+ function swapExactETHForTokens(
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external payable returns (uint256[] memory amounts);
+
+ function swapTokensForExactETH(
+ uint256 amountOut,
+ uint256 amountInMax,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external returns (uint256[] memory amounts);
+
+ function swapExactTokensForETH(
+ uint256 amountIn,
+ uint256 amountOutMin,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external returns (uint256[] memory amounts);
+
+ function swapETHForExactTokens(
+ uint256 amountOut,
+ address[] calldata path,
+ address to,
+ uint256 deadline
+ ) external payable returns (uint256[] memory amounts);
+
+ function quote(
+ uint256 amountA,
+ uint256 reserveA,
+ uint256 reserveB
+ ) external pure returns (uint256 amountB);
+
+ function getAmountOut(
+ uint256 amountIn,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) external pure returns (uint256 amountOut);
+
+ function getAmountIn(
+ uint256 amountOut,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) external pure returns (uint256 amountIn);
+
+ function getAmountsOut(
+ uint256 amountIn,
+ address[] calldata path
+ ) external view returns (uint256[] memory amounts);
+
+ function getAmountsIn(
+ uint256 amountOut,
+ address[] calldata path
+ ) external view returns (uint256[] memory amounts);
+}
diff --git a/src/interfaces/IWETH.sol b/src/interfaces/IWETH.sol
new file mode 100644
index 0000000..99ed6d6
--- /dev/null
+++ b/src/interfaces/IWETH.sol
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+interface IWETH {
+ function deposit() external payable;
+ function withdraw(uint256) external;
+ function transfer(address to, uint256 value) external returns (bool);
+}
diff --git a/src/libraries/Math.sol b/src/libraries/Math.sol
new file mode 100644
index 0000000..ec853c3
--- /dev/null
+++ b/src/libraries/Math.sol
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+library UniswapV2Math {
+ function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
+ z = x < y ? x : y;
+ }
+
+ // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
+ function sqrt(uint256 y) internal pure returns (uint256 z) {
+ if (y > 3) {
+ z = y;
+ uint256 x = y / 2 + 1;
+ while (x < z) {
+ z = x;
+ x = (y / x + x) / 2;
+ }
+ } else if (y != 0) {
+ z = 1;
+ }
+ }
+}
diff --git a/src/libraries/TransferHelper.sol b/src/libraries/TransferHelper.sol
new file mode 100644
index 0000000..2b3bf3d
--- /dev/null
+++ b/src/libraries/TransferHelper.sol
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+library TransferHelper {
+ function safeApprove(address token, address to, uint256 value) internal {
+ // bytes4(keccak256(bytes('approve(address,uint256)')));
+ (bool success, bytes memory data) = token.call(
+ abi.encodeWithSelector(0x095ea7b3, to, value)
+ );
+ if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
+ revert("TransferHelper::safeApprove: approve failed");
+ }
+ }
+
+ function safeTransfer(address token, address to, uint256 value) internal {
+ // bytes4(keccak256(bytes('transfer(address,uint256)')));
+ (bool success, bytes memory data) = token.call(
+ abi.encodeWithSelector(0xa9059cbb, to, value)
+ );
+ if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
+ revert("TransferHelper::safeTransfer: transfer failed");
+ }
+ }
+
+ function safeTransferFrom(
+ address token,
+ address from,
+ address to,
+ uint256 value
+ ) internal {
+ // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
+ (bool success, bytes memory data) = token.call(
+ abi.encodeWithSelector(0x23b872dd, from, to, value)
+ );
+ if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
+ revert("TransferHelper::transferFrom: transferFrom failed");
+ }
+ }
+
+ function safeTransferETH(address to, uint256 value) internal {
+ (bool success, ) = to.call{value: value}(new bytes(0));
+ if (!success) revert("TransferHelper::safeTransferETH: ETH transfer failed");
+ }
+}
diff --git a/src/libraries/UQ112x112.sol b/src/libraries/UQ112x112.sol
new file mode 100644
index 0000000..0b76c1d
--- /dev/null
+++ b/src/libraries/UQ112x112.sol
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+library UQ112x112 {
+ //solhint-disable-next-line state-visibility
+ uint224 constant Q112 = 2 ** 112;
+
+ // encode a uint112 as a UQ112x112
+ function encode(uint112 y) internal pure returns (uint224 z) {
+ z = uint224(y) * Q112; // never overflows
+ }
+
+ // divide a UQ112x112 by a uint112, returning a UQ112x112
+ function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
+ z = x / uint224(y);
+ }
+}
diff --git a/src/libraries/UniswapV2Library.sol b/src/libraries/UniswapV2Library.sol
new file mode 100644
index 0000000..0f01c5d
--- /dev/null
+++ b/src/libraries/UniswapV2Library.sol
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import "../interfaces/IUniswapV2Pair.sol";
+
+library UniswapV2Library {
+ // returns sorted token addresses, used to handle return values from pairs sorted in this order
+ function sortTokens(
+ address tokenA,
+ address tokenB
+ ) internal pure returns (address token0, address token1) {
+ if (tokenA == tokenB) revert("UniswapV2Library: IDENTICAL_ADDRESSES");
+ (token0, token1) = tokenA < tokenB
+ ? (tokenA, tokenB)
+ : (tokenB, tokenA);
+ if (token0 == address(0)) revert("UniswapV2Library: ZERO_ADDRESS");
+ }
+
+ // calculates the CREATE2 address for a pair without making any external calls
+ function pairFor(
+ address factory,
+ address tokenA,
+ address tokenB
+ ) internal pure returns (address pair) {
+ (address token0, address token1) = sortTokens(tokenA, tokenB);
+ pair = address(
+ uint160(
+ uint256(
+ keccak256(
+ abi.encodePacked(
+ bytes1(0xff),
+ factory,
+ keccak256(abi.encodePacked(token0, token1)),
+ // hex"443533a897cfad2762695078bf6ee9b78b4edcda64ec31e1c83066cee4c90a7e" // init code hash
+ // hex"7b5d0bf8129b1dafc6a0c5ca9822522c5c0c69ebc66d6af886ae16fa5b9db6ef" // init code hash
+ hex"2512d6f091a7cc78ba777ddd98c57630a8cbbf9e4afca50e51170141f5029973" // init code hash
+ )
+ )
+ )
+ )
+ );
+ }
+
+ // fetches and sorts the reserves for a pair
+ function getReserves(
+ address factory,
+ address tokenA,
+ address tokenB
+ ) internal view returns (uint256 reserveA, uint256 reserveB) {
+ (address token0, ) = sortTokens(tokenA, tokenB);
+ (uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(
+ pairFor(factory, tokenA, tokenB)
+ ).getReserves();
+ (reserveA, reserveB) = tokenA == token0
+ ? (reserve0, reserve1)
+ : (reserve1, reserve0);
+ }
+
+ // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
+ function quote(
+ uint256 amountA,
+ uint256 reserveA,
+ uint256 reserveB
+ ) internal pure returns (uint256 amountB) {
+ if (amountA == 0) revert("UniswapV2Library: INSUFFICIENT_AMOUNT");
+ if (reserveA == 0 || reserveB == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
+ amountB = (amountA * reserveB) / reserveA;
+ }
+
+ // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
+ function getAmountOut(
+ uint256 amountIn,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) internal pure returns (uint256 amountOut) {
+ if (amountIn == 0) revert("UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
+ if (reserveIn == 0 || reserveOut == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
+ uint256 amountInWithFee = amountIn * 997;
+ uint256 numerator = amountInWithFee * reserveOut;
+ uint256 denominator = reserveIn * 1000 + amountInWithFee;
+ amountOut = numerator / denominator;
+ }
+
+ // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
+ function getAmountIn(
+ uint256 amountOut,
+ uint256 reserveIn,
+ uint256 reserveOut
+ ) internal pure returns (uint256 amountIn) {
+ if (amountOut == 0) revert("UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT");
+ if (reserveIn == 0 || reserveOut == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
+ uint256 numerator = reserveIn * amountOut * 1000;
+ uint256 denominator = (reserveOut - amountOut) * 997;
+ amountIn = numerator / denominator + 1;
+ }
+
+ // performs chained getAmountOut calculations on any number of pairs
+ function getAmountsOut(
+ address factory,
+ uint256 amountIn,
+ address[] memory path
+ ) internal view returns (uint256[] memory amounts) {
+ if (path.length < 2) revert("UniswapV2Library: INVALID_PATH");
+ amounts = new uint256[](path.length);
+ amounts[0] = amountIn;
+ for (uint256 i; i < path.length - 1; i++) {
+ (uint256 reserveIn, uint256 reserveOut) = getReserves(
+ factory,
+ path[i],
+ path[i + 1]
+ );
+ amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
+ }
+ }
+
+ // performs chained getAmountIn calculations on any number of pairs
+ function getAmountsIn(
+ address factory,
+ uint256 amountOut,
+ address[] memory path
+ ) internal view returns (uint256[] memory amounts) {
+ if (path.length < 2) revert("UniswapV2Library: INVALID_PATH");
+ amounts = new uint256[](path.length);
+ amounts[amounts.length - 1] = amountOut;
+ for (uint256 i = path.length - 1; i > 0; i--) {
+ (uint256 reserveIn, uint256 reserveOut) = getReserves(
+ factory,
+ path[i - 1],
+ path[i]
+ );
+ amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
+ }
+ }
+}
diff --git a/src/mock/MockERC20.sol b/src/mock/MockERC20.sol
new file mode 100644
index 0000000..7428ac4
--- /dev/null
+++ b/src/mock/MockERC20.sol
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+contract MockERC20 {
+ string public name;
+ string public symbol;
+ uint8 public decimals;
+ uint256 public totalSupply;
+
+ event Approval(address indexed src, address indexed guy, uint256 wad);
+ event Transfer(address indexed src, address indexed dst, uint256 wad);
+ event Deposit(address indexed dst, uint256 wad);
+ event Withdrawal(address indexed src, uint256 wad);
+
+ mapping (address => uint256) public balanceOf;
+ mapping (address => mapping (address => uint256)) public allowance;
+
+ constructor(string memory _name, string memory _symbol, uint8 _decimals) {
+ name = _name;
+ symbol = _symbol;
+ decimals = _decimals;
+ }
+
+ function mint(address guy, uint256 wad) public {
+ balanceOf[guy] += wad;
+ totalSupply += wad;
+ }
+
+ function approve(address guy, uint256 wad) public returns (bool) {
+ allowance[msg.sender][guy] = wad;
+ emit Approval(msg.sender, guy, wad);
+ return true;
+ }
+
+ function transfer(address dst, uint256 wad) public returns (bool) {
+ return transferFrom(msg.sender, dst, wad);
+ }
+
+ function transferFrom(address src, address dst, uint256 wad)
+ public
+ returns (bool)
+ {
+ require(balanceOf[src] >= wad);
+
+ if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
+ require(allowance[src][msg.sender] >= wad);
+ allowance[src][msg.sender] -= wad;
+ }
+
+ balanceOf[src] -= wad;
+ balanceOf[dst] += wad;
+
+ emit Transfer(src, dst, wad);
+
+ return true;
+ }
+}
diff --git a/test/Counter.t.sol b/test/Counter.t.sol
deleted file mode 100644
index 54b724f..0000000
--- a/test/Counter.t.sol
+++ /dev/null
@@ -1,24 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-import {Test, console} from "forge-std/Test.sol";
-import {Counter} from "../src/Counter.sol";
-
-contract CounterTest is Test {
- Counter public counter;
-
- function setUp() public {
- counter = new Counter();
- counter.setNumber(0);
- }
-
- function test_Increment() public {
- counter.increment();
- assertEq(counter.number(), 1);
- }
-
- function testFuzz_SetNumber(uint256 x) public {
- counter.setNumber(x);
- assertEq(counter.number(), x);
- }
-}
diff --git a/test/UniswapV2Factory.t.sol b/test/UniswapV2Factory.t.sol
new file mode 100644
index 0000000..2c4ac07
--- /dev/null
+++ b/test/UniswapV2Factory.t.sol
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import {Test} from "forge-std/Test.sol";
+
+import "../src/UniswapV2Factory.sol";
+import "../src/UniswapV2Pair.sol";
+import "../src/mock/MockERC20.sol";
+
+import "../src/libraries/UniswapV2Library.sol";
+
+contract UniswapV2FactoryTest is Test {
+ UniswapV2Factory public factory;
+ MockERC20 public token0;
+ MockERC20 public token1;
+ MockERC20 public token2;
+ MockERC20 public token3;
+
+ function setUp() public {
+ factory = new UniswapV2Factory(address(0));
+
+ token0 = new MockERC20("SomeToken0", "ST0", 18);
+ token1 = new MockERC20("SomeToken1", "ST1", 18);
+ token2 = new MockERC20("SomeToken2", "ST2", 9);
+ token3 = new MockERC20("SomeToken3", "ST3", 6);
+ }
+
+ function testCreatePair() public {
+ address tokenPair = factory.createPair(address(token0), address(token1));
+ (address _token0, address _token1) = UniswapV2Library.sortTokens(
+ address(token0),
+ address(token1)
+ );
+
+ assertEq(factory.allPairsLength(), 1);
+ assertEq(factory.getPair(address(token0), address(token1)), tokenPair);
+ assertEq(UniswapV2Pair(tokenPair).token0(), _token0);
+ assertEq(UniswapV2Pair(tokenPair).token1(), _token1);
+ }
+
+ function testCreatePairMultipleTokens() public {
+ address tokenPair0 = factory.createPair(address(token0), address(token1));
+ address tokenPair1 = factory.createPair(address(token2), address(token3));
+
+ (address _token0, address _token1) = UniswapV2Library.sortTokens(address(token0), address(token1));
+ (address _token2, address _token3) = UniswapV2Library.sortTokens(address(token2), address(token3));
+
+ assertEq(factory.allPairsLength(), 2);
+ assertEq(factory.getPair(address(token0), address(token1)), tokenPair0);
+ assertEq(factory.getPair(address(token2), address(token3)), tokenPair1);
+ assertEq(UniswapV2Pair(tokenPair0).token0(), _token0);
+ assertEq(UniswapV2Pair(tokenPair0).token1(), _token1);
+ assertEq(UniswapV2Pair(tokenPair1).token0(), _token2);
+ assertEq(UniswapV2Pair(tokenPair1).token1(), _token3);
+ }
+
+ function testCreatePairChained() public {
+ address tokenPair0 = factory.createPair(address(token0), address(token1));
+ address tokenPair1 = factory.createPair(address(token1), address(token2));
+ address tokenPair2 = factory.createPair(address(token2), address(token3));
+
+ assertEq(factory.allPairsLength(), 3);
+ assertEq(factory.getPair(address(token0), address(token1)), tokenPair0);
+ assertEq(factory.getPair(address(token1), address(token2)), tokenPair1);
+ assertEq(factory.getPair(address(token2), address(token3)), tokenPair2);
+ }
+
+ function testCreatePairIdenticalTokens() public {
+ vm.expectRevert();
+ factory.createPair(address(token0), address(token0));
+ }
+
+ function testCreatePairInvalidToken() public {
+ vm.expectRevert();
+ factory.createPair(address(0), address(token1));
+
+ vm.expectRevert();
+ factory.createPair(address(token0), address(0));
+ }
+
+ function testCreatePairDuplicatePair() public {
+ factory.createPair(address(token0), address(token1));
+ vm.expectRevert();
+ factory.createPair(address(token0), address(token1));
+ }
+}
diff --git a/test/UniswapV2Pair.t.sol b/test/UniswapV2Pair.t.sol
new file mode 100644
index 0000000..bb373a8
--- /dev/null
+++ b/test/UniswapV2Pair.t.sol
@@ -0,0 +1,441 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import {Test} from "forge-std/Test.sol";
+
+import "../src/mock/MockERC20.sol";
+import "../src/UniswapV2Pair.sol";
+import "../src/UniswapV2Factory.sol";
+import "../src/libraries/UQ112x112.sol";
+
+contract MockUser {
+ function addLiquidity(
+ address pair,
+ address _token0,
+ address _token1,
+ uint256 _amount0,
+ uint256 _amount1
+ ) public returns (uint256) {
+ MockERC20(_token0).transfer(pair, _amount0);
+ MockERC20(_token1).transfer(pair, _amount1);
+ return UniswapV2Pair(pair).mint(address(this));
+ }
+
+ function removeLiquidity(address pair, uint256 liquidity)
+ public
+ returns (uint256, uint256)
+ {
+ UniswapV2Pair(pair).transfer(pair, liquidity);
+
+ return UniswapV2Pair(pair).burn(address(this));
+ }
+}
+
+contract TestUniswapV2Pair is Test {
+ MockERC20 public token0;
+ MockERC20 public token1;
+ UniswapV2Pair public pair;
+ UniswapV2Factory public factory;
+ MockUser public user;
+
+ function setUp() public {
+ token0 = new MockERC20("SomeToken0", "ST0", 18);
+ token1 = new MockERC20("SomeToken1", "ST1", 9);
+
+ factory = new UniswapV2Factory(address(0));
+ address tokenAddress = factory.createPair(address(token0), address(token1));
+ pair = UniswapV2Pair(tokenAddress);
+ // pair.initialize(address(token0), address(token1));
+
+ token0.mint(address(this), 10 ether);
+ token1.mint(address(this), 10 ether);
+
+ user = new MockUser();
+ token0.mint(address(user), 10 ether);
+ token1.mint(address(user), 10 ether);
+ }
+
+ function assertBlockTimestampLast(uint256 timestamp) public view {
+ (, , uint32 lastBlockTimestamp) = pair.getReserves();
+ assertEq(timestamp, lastBlockTimestamp);
+ }
+
+ function getCurrentMarginalPrices()
+ public
+ view
+ returns (uint256 price0, uint256 price1)
+ {
+ (uint112 reserve0, uint112 reserve1, ) = pair.getReserves();
+
+ price0 = reserve0 > 0
+ ? uint256(UQ112x112.encode(reserve1)) / reserve0
+ : 0;
+ price1 = reserve1 > 0
+ ? uint256(UQ112x112.encode(reserve0)) / reserve1
+ : 0;
+ }
+
+ function sortAmountsByTokens(uint256 amount0, uint256 amount1) public view returns (uint256, uint256) {
+ if (token0 < token1) {
+ return (amount0, amount1);
+ } else {
+ return (amount1, amount0);
+ }
+ }
+
+ function assertCumulativePrices(uint256 price0, uint256 price1) public view {
+ assertEq(
+ price0,
+ pair.price0CumulativeLast(),
+ "unexpected cumulative price 0"
+ );
+ assertEq(
+ price1,
+ pair.price1CumulativeLast(),
+ "unexpected cumulative price 1"
+ );
+ }
+
+ function assertPairReserves(uint256 _reserve0, uint256 _reserve1) public view {
+ (uint256 reserve0, uint256 reserve1,) = pair.getReserves();
+ // (reserve0, reserve1) = sortAmountsByTokens(reserve0, reserve1);
+ assertEq(reserve0, _reserve0);
+ assertEq(reserve1, _reserve1);
+ }
+
+ function testMintNewPair() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+
+ uint256 liquidity = pair.mint(address(this));
+
+ assertPairReserves(1 ether, 1 ether);
+ assertEq(pair.balanceOf(address(0)), pair.MINIMUM_LIQUIDITY());
+ assertEq(pair.balanceOf(address(this)), liquidity);
+ assertEq(pair.totalSupply(), liquidity + pair.MINIMUM_LIQUIDITY());
+ }
+
+ function testMintWithReserve() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ token0.transfer(address(pair), 2 ether);
+ token1.transfer(address(pair), 2 ether);
+ uint256 l2 = pair.mint(address(this));
+
+ assertPairReserves(3 ether, 3 ether);
+ assertEq(pair.balanceOf(address(this)), l1 + l2);
+ assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
+ }
+
+ function testMintUnequalBalance() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ token0.transfer(address(pair), 4 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l2 = pair.mint(address(this));
+
+ assertPairReserves(2 ether, 5 ether);
+ assertEq(pair.balanceOf(address(this)), l1 + l2);
+ assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
+ }
+
+ function testMintArithmeticUnderflow() public {
+ // 0x11: Arithmetic over/underflow
+ vm.expectRevert();
+ pair.mint(address(this));
+ }
+
+ function testMintInsufficientLiquidity() public {
+ token0.transfer(address(pair), 1000);
+ token1.transfer(address(pair), 1000);
+
+ vm.expectRevert();
+ pair.mint(address(this));
+ }
+
+ function testMintMultipleUsers() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ uint256 l2 = user.addLiquidity(
+ address(pair),
+ address(token0),
+ address(token1),
+ 2 ether,
+ 3 ether
+ );
+
+ assertPairReserves(4 ether, 3 ether);
+ assertEq(pair.balanceOf(address(this)), l1);
+ assertEq(pair.balanceOf(address(user)), l2);
+ assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
+ }
+
+ function testBurn() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 liquidity = pair.mint(address(this));
+
+ pair.transfer(address(pair), liquidity);
+ pair.burn(address(this));
+
+ assertEq(pair.balanceOf(address(this)), 0);
+ assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
+ assertPairReserves(pair.MINIMUM_LIQUIDITY(), pair.MINIMUM_LIQUIDITY());
+ assertEq(
+ token0.balanceOf(address(this)),
+ 10 ether - pair.MINIMUM_LIQUIDITY()
+ );
+ assertEq(
+ token1.balanceOf(address(this)),
+ 10 ether - pair.MINIMUM_LIQUIDITY()
+ );
+ }
+
+ function testBurnUnequal() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l0 = pair.mint(address(this));
+
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 2 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ pair.transfer(address(pair), l0 + l1);
+ (uint256 amount0, uint256 amount1) = pair.burn(address(this));
+ (amount0, amount1) = sortAmountsByTokens(amount0, amount1);
+
+ assertEq(pair.balanceOf(address(this)), 0);
+ assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
+ assertEq(token0.balanceOf(address(this)), 10 ether - 2 ether + amount0);
+ assertEq(token1.balanceOf(address(this)), 10 ether - 3 ether + amount1);
+ }
+
+ function testBurnNoLiquidity() public {
+ // 0x12: divide/modulo by zero
+ vm.expectRevert();
+ pair.burn(address(this));
+ }
+
+ function testBurnInsufficientLiquidityBurned() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ vm.expectRevert();
+ pair.burn(address(this));
+ }
+
+ function testBurnMultipleUsers() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ uint256 l2 = user.addLiquidity(
+ address(pair),
+ address(token0),
+ address(token1),
+ 2 ether,
+ 3 ether
+ );
+
+ pair.transfer(address(pair), l1);
+ (uint256 amount0, uint256 amount1) = pair.burn(address(this));
+ (amount0, amount1) = sortAmountsByTokens(amount0, amount1);
+
+ assertEq(pair.balanceOf(address(this)), 0);
+ assertEq(pair.balanceOf(address(user)), l2);
+ assertEq(pair.totalSupply(), l2 + pair.MINIMUM_LIQUIDITY());
+ assertPairReserves(4 ether - amount1, 3 ether - amount0);
+ assertEq(token0.balanceOf(address(this)), 10 ether - 1 ether + amount0);
+ assertEq(token1.balanceOf(address(this)), 10 ether - 1 ether + amount1);
+ }
+
+ function testBurnUnbalancedMultipleUsers() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ uint256 l1 = pair.mint(address(this));
+
+ uint256 l2 = user.addLiquidity(
+ address(pair),
+ address(token0),
+ address(token1),
+ 2 ether,
+ 3 ether
+ );
+
+ (uint256 a00, uint256 a01) = user.removeLiquidity(address(pair), l2);
+ (a00, a01) = sortAmountsByTokens(a00, a01);
+
+ pair.transfer(address(pair), l1);
+ (uint256 a10, uint256 a11) = pair.burn(address(this));
+ (a10, a11) = sortAmountsByTokens(a10, a11);
+
+ assertEq(pair.balanceOf(address(this)), 0);
+ assertEq(pair.balanceOf(address(user)), 0);
+ assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
+
+ // second user penalised for unbalanced liquidity, hence reserves unbalanced
+ assertPairReserves(
+ pair.MINIMUM_LIQUIDITY() * 4 / 3 + 1,
+ pair.MINIMUM_LIQUIDITY()
+ );
+ assertEq(token0.balanceOf(address(this)), 10 ether - 1 ether + a10);
+ assertEq(token1.balanceOf(address(this)), 10 ether - 1 ether + a11);
+ assertEq(token0.balanceOf(address(user)), 10 ether - 2 ether + a00);
+ assertEq(token1.balanceOf(address(user)), 10 ether - 3 ether + a01);
+ }
+
+ function testSwap() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ // transfer to maintain K
+ token1.transfer(address(pair), 1 ether);
+ pair.swap(0.5 ether, 0 ether, address(user), "");
+
+ assertPairReserves(1.5 ether, 1 ether);
+ assertEq(token1.balanceOf(address(user)), 10 ether + 0.5 ether);
+ }
+
+ function testSwapMultipleUserLiquidity() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ user.addLiquidity(
+ address(pair),
+ address(token0),
+ address(token1),
+ 2 ether,
+ 3 ether
+ );
+
+ // transfer to maintain K
+ token0.transfer(address(pair), 2 ether);
+ pair.swap(0 ether, 1 ether, address(user), "");
+ assertPairReserves(4 ether, 4 ether);
+ }
+
+ function testSwapUnderpriced() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ // transfer to maintain K
+ token1.transfer(address(pair), 1 ether);
+ pair.swap(0, 0.4 ether, address(user), "");
+ assertPairReserves(2 ether, 0.6 ether);
+ }
+
+ function testSwapInvalidAmount() public {
+ vm.expectRevert();
+ pair.swap(0 ether, 0 ether, address(user), "");
+ }
+
+ function testSwapInsufficientLiquidity() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ vm.expectRevert();
+ pair.swap(3 ether, 0 ether, address(user), "");
+
+ vm.expectRevert();
+ pair.swap(0 ether, 3 ether, address(user), "");
+ }
+
+ function testSwapSwapToSelf() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ vm.expectRevert();
+ pair.swap(1 ether, 0 ether, address(token0), "");
+
+ vm.expectRevert();
+ pair.swap(0 ether, 1 ether, address(token1), "");
+ }
+
+ function testSwapInvalidConstantProductFormula() public {
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ vm.expectRevert();
+ pair.swap(1 ether, 0 ether, address(user), "");
+
+ vm.expectRevert();
+ pair.swap(0 ether, 1 ether, address(user), "");
+ }
+
+ function testCumulativePrices() public {
+ vm.warp(0);
+ token0.transfer(address(pair), 1 ether);
+ token1.transfer(address(pair), 1 ether);
+ pair.mint(address(this));
+
+ pair.sync();
+ assertCumulativePrices(0, 0);
+
+ (
+ uint256 currentPrice0,
+ uint256 currentPrice1
+ ) = getCurrentMarginalPrices();
+
+ vm.warp(1);
+ pair.sync();
+ assertBlockTimestampLast(1);
+ assertCumulativePrices(currentPrice0, currentPrice1);
+
+ vm.warp(2);
+ pair.sync();
+ assertBlockTimestampLast(2);
+ assertCumulativePrices(currentPrice0 * 2, currentPrice1 * 2);
+
+ vm.warp(3);
+ pair.sync();
+ assertBlockTimestampLast(3);
+ assertCumulativePrices(currentPrice0 * 3, currentPrice1 * 3);
+
+ user.addLiquidity(
+ address(pair),
+ address(token0),
+ address(token1),
+ 2 ether,
+ 3 ether
+ );
+
+ (uint256 newPrice0, uint256 newPrice1) = getCurrentMarginalPrices();
+
+ vm.warp(4);
+ pair.sync();
+ assertBlockTimestampLast(4);
+ assertCumulativePrices(
+ currentPrice0 * 3 + newPrice0,
+ currentPrice1 * 3 + newPrice1
+ );
+
+ vm.warp(5);
+ pair.sync();
+ assertBlockTimestampLast(5);
+ assertCumulativePrices(
+ currentPrice0 * 3 + newPrice0 * 2,
+ currentPrice1 * 3 + newPrice1 * 2
+ );
+
+ vm.warp(6);
+ pair.sync();
+ assertBlockTimestampLast(6);
+ assertCumulativePrices(
+ currentPrice0 * 3 + newPrice0 * 3,
+ currentPrice1 * 3 + newPrice1 * 3
+ );
+ }
+}
diff --git a/test/UniswapV2Router.t.sol b/test/UniswapV2Router.t.sol
new file mode 100644
index 0000000..6a6ff46
--- /dev/null
+++ b/test/UniswapV2Router.t.sol
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.20;
+
+import {Test} from "forge-std/Test.sol";
+
+import "../src/mock/MockERC20.sol";
+import "../src/interfaces/IERC20.sol";
+
+import "../src/UniswapV2Factory.sol";
+import "../src/UniswapV2Router.sol";
+import "../src/UniswapV2Pair.sol";
+import "../src/WETH9.sol";
+
+import "../src/libraries/UniswapV2Library.sol";
+
+contract TestUniswapV2Router is Test {
+ UniswapV2Factory public factory;
+ UniswapV2Router public router;
+
+ MockERC20 public token0;
+ MockERC20 public token1;
+
+ WETH9 public weth;
+
+ function setUp() public {
+ weth = new WETH9();
+ factory = new UniswapV2Factory(address(0));
+ router = new UniswapV2Router(address(factory), address(weth));
+
+ token0 = new MockERC20("SomeToken0", "ST0", 18);
+ token1 = new MockERC20("SomeToken1", "ST1", 9);
+
+ token0.mint(address(this), 10 ether);
+ token1.mint(address(this), 10 ether);
+ }
+
+ function testAddLiquidityPairFor() public {
+ token0.approve(address(router), 10 ether);
+ token1.approve(address(router), 10 ether);
+
+ (address _token0, address _token1) = UniswapV2Library.sortTokens(
+ address(token0),
+ address(token1)
+ );
+ address pair = UniswapV2Library.pairFor(
+ address(factory),
+ _token0,
+ _token1
+ );
+
+ (, , uint256 liquidity) = router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ assertEq(liquidity, 1 ether - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+ assertEq(factory.getPair(address(token0), address(token1)), pair);
+ }
+
+ function testAddLiquidityNoPair() public {
+ token0.approve(address(router), 10 ether);
+ token1.approve(address(router), 10 ether);
+
+ (address _token0, address _token1) = UniswapV2Library.sortTokens(
+ address(token0),
+ address(token1)
+ );
+
+ address pair = UniswapV2Library.pairFor(
+ address(factory),
+ _token0,
+ _token1
+ );
+
+ (uint256 amount0, uint256 amount1, uint256 liquidity) = router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ assertEq(amount0, 1 ether);
+ assertEq(amount1, 1 ether);
+ assertEq(liquidity, 1 ether - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+
+ assertEq(factory.getPair(address(token0), address(token1)), pair);
+ assertEq(UniswapV2Pair(pair).token0(), address(token0));
+ assertEq(UniswapV2Pair(pair).token1(), address(token1));
+
+ (uint256 reserve0, uint256 reserve1, ) = UniswapV2Pair(pair).getReserves();
+ assertEq(reserve0, 1 ether);
+ assertEq(reserve1, 1 ether);
+ assertEq(token0.balanceOf(address(pair)), 1 ether);
+ assertEq(token1.balanceOf(address(pair)), 1 ether);
+ assertEq(token0.balanceOf(address(this)), 9 ether);
+ assertEq(token1.balanceOf(address(this)), 9 ether);
+ }
+
+ function testAddLiquidityInsufficientAmountB() public {
+ token0.approve(address(router), 4 ether);
+ token1.approve(address(router), 8 ether);
+
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 4 ether,
+ 8 ether,
+ 4 ether,
+ 8 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 2 ether);
+
+ vm.expectRevert();
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 2 ether,
+ 1 ether,
+ 2.3 ether,
+ address(this),
+ block.timestamp + 1
+ );
+ }
+
+ function testAddLiquidityAmountBDesiredHigh() public {
+ token0.approve(address(router), 4 ether);
+ token1.approve(address(router), 8 ether);
+
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 4 ether,
+ 8 ether,
+ 4 ether,
+ 8 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 2 ether);
+
+ (uint256 amount0, uint256 amount1, ) = router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 2.3 ether,
+ 1 ether,
+ 2 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ assertEq(amount0, 1 ether);
+ assertEq(amount1, 2 ether);
+ }
+
+ function testAddLiquidityAmountBDesiredLow() public {
+ token0.approve(address(router), 4 ether);
+ token1.approve(address(router), 8 ether);
+
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 4 ether,
+ 8 ether,
+ 4 ether,
+ 8 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 2 ether);
+
+ (uint256 amount0, uint256 amount1, ) = router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1.5 ether,
+ 0.75 ether,
+ 2 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ assertEq(amount0, 0.75 ether);
+ assertEq(amount1, 1.5 ether);
+ }
+
+ function testAddLiquidityInsufficientAmountA() public {
+ token0.approve(address(router), 4 ether);
+ token1.approve(address(router), 8 ether);
+
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 4 ether,
+ 8 ether,
+ 4 ether,
+ 8 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 2 ether);
+
+ vm.expectRevert();
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1.5 ether,
+ 1 ether,
+ 2 ether,
+ address(this),
+ block.timestamp + 1
+ );
+ }
+
+ function testAddLiquidityExpired() public {
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 1 ether);
+
+ vm.warp(2);
+ vm.expectRevert();
+ router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ address(this),
+ 1
+ );
+ }
+
+ function testRemoveLiquidity() public {
+ token0.approve(address(router), 1 ether);
+ token1.approve(address(router), 1 ether);
+
+ (uint256 amount0, uint256 amount1, uint256 liquidity) = router.addLiquidity(
+ address(token0),
+ address(token1),
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ 1 ether,
+ address(this),
+ block.timestamp + 1
+ );
+
+ uint256 prevAmount0 = token0.balanceOf(address(this));
+ uint256 prevAmount1 = token1.balanceOf(address(this));
+
+ address pair = factory.getPair(address(token0), address(token1));
+ assertEq(IERC20(pair).balanceOf(address(this)), liquidity);
+ IERC20(pair).approve(address(router), liquidity);
+
+ router.removeLiquidity(
+ address(token0),
+ address(token1),
+ liquidity,
+ 0,
+ 0,
+ address(this),
+ block.timestamp + 1
+ );
+ UniswapV2Pair(pair).skim(address(this));
+
+ assertEq(IERC20(pair).balanceOf(address(this)), 0);
+ assertEq(token0.balanceOf(address(this)), prevAmount0 + amount0 - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+ assertEq(token1.balanceOf(address(this)), prevAmount1 + amount1 - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+
+ assertEq(token0.balanceOf(pair), UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+ assertEq(token1.balanceOf(pair), UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
+ }
+}