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feat: Decode single and sequential swaps in LibSwap

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- The old way was useful when we just had split swaps. Unfortunately, we now have split, sequential, and single swaps, which don't always require token indices or split percentages, so we need to decode differently for each case.
This commit is contained in:
TAMARA LIPOWSKI
2025-03-18 01:37:14 -04:00
committed by Diana Carvalho
parent 3ae9d3ad67
commit 1dad4afb6b
5 changed files with 148 additions and 111 deletions
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60
foundry/lib/LibSwap.sol
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@@ -2,36 +2,42 @@
pragma solidity ^0.8.26;
library LibSwap {
/// Returns the InToken index into an array of tokens
function tokenInIndex(
bytes calldata swap
) internal pure returns (uint8 res) {
res = uint8(swap[0]);
/**
* @dev Returns arguments required to perform a single swap
*/
function decodeSingleSwap(bytes calldata swap)
internal
pure
returns (address executor, bytes calldata protocolData)
{
executor = address(uint160(bytes20(swap[0:20])));
protocolData = swap[20:];
}
/// The OutToken index into an array of tokens
function tokenOutIndex(
bytes calldata swap
) internal pure returns (uint8 res) {
res = uint8(swap[1]);
/**
* @dev Returns arguments required to perform a sequential swap
*/
function decodeSequentialSwap(bytes calldata swap)
internal
pure
returns (address executor, bytes calldata protocolData)
{
executor = address(uint160(bytes20(swap[0:20])));
protocolData = swap[20:];
}
/// The relative amount of token quantity routed into this swap
function splitPercentage(
bytes calldata swap
) internal pure returns (uint24 res) {
res = uint24(bytes3(swap[2:5]));
}
/// The address of the executor contract
function executor(bytes calldata swap) internal pure returns (address res) {
res = address(uint160(bytes20(swap[5:25])));
}
/// Remaining bytes are interpreted as protocol data
function protocolData(
bytes calldata swap
) internal pure returns (bytes calldata res) {
res = swap[25:];
/**
* @dev Returns arguments required to perform a split swap
*/
function decodeSplitSwap(bytes calldata swap)
internal
pure
returns (uint8 tokenInIndex, uint8 tokenOutIndex, uint24 split, address executor, bytes calldata protocolData)
{
tokenInIndex = uint8(swap[0]);
tokenOutIndex = uint8(swap[1]);
split = uint24(bytes3(swap[2:5]));
executor = address(uint160(bytes20(swap[5:25])));
protocolData = swap[25:];
}
}