Refactor and add Balancer V2 stub

evm/src/balancer-v2/BalancerV2SwapAdapter.sol

@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.13;
+
+import {IERC20, ISwapAdapter} from "interfaces/ISwapAdapter.sol";
+
+contract BalancerV2SwapAdapter is ISwapAdapter {
+
+    constructor() {
+    }
+
+    function getPairReserves(
+        bytes32 pairId,
+        IERC20 sellToken,
+        IERC20 buyToken
+    ) internal view returns (uint112 r0, uint112 r1) {
+        revert NotImplemented("BalancerV2SwapAdapter.getPairReserves");
+    }
+
+    function price(
+        bytes32 pairId,
+        IERC20 sellToken,
+        IERC20 buyToken,
+        uint256[] memory sellAmounts
+    ) external view override returns (Fraction[] memory prices) {
+        revert NotImplemented("BalancerV2SwapAdapter.price");
+    }
+
+    function getPriceAt(uint256 amountIn, uint256 reserveIn, uint256 reserveOut)
+        internal
+        pure
+        returns (Fraction memory)
+    {
+        revert NotImplemented("BalancerV2SwapAdapter.getPriceAt");
+    }
+
+    function swap(
+        bytes32 pairId,
+        IERC20 sellToken,
+        IERC20 buyToken,
+        SwapSide side,
+        uint256 specifiedAmount
+    ) external override returns (Trade memory trade) {
+        revert NotImplemented("BalancerV2SwapAdapter.swap");
+    }
+
+    function getLimits(bytes32 pairId, SwapSide side)
+        external
+        view
+        override
+        returns (uint256[] memory limits)
+    {
+        revert NotImplemented("BalancerV2SwapAdapter.getLimits");
+    }
+
+    function getCapabilities(bytes32, IERC20, IERC20)
+        external
+        pure
+        override
+        returns (Capability[] memory capabilities)
+    {
+        capabilities = new Capability[](3);
+        capabilities[0] = Capability.SellSide;
+        capabilities[1] = Capability.BuySide;
+        capabilities[2] = Capability.PriceFunction;
+    }
+
+    function getTokens(bytes32 pairId)
+        external
+        view
+        override
+        returns (IERC20[] memory tokens)
+    {
+        revert NotImplemented("BalancerV2SwapAdapter.getTokens");
+    }
+
+    function getPoolIds(uint256 offset, uint256 limit)
+        external
+        view
+        override
+        returns (bytes32[] memory ids)
+    {
+        revert NotImplemented("BalancerV2SwapAdapter.getPoolIds");
+    }
+}