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feat: add lib randomizer #63

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Merged
huyhuynh3103 merged 1 commit into from
Apr 20, 2025
Merged

feat: add lib randomizer #63

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23 changes: 23 additions & 0 deletions src/utils/LibRandomizer.sol
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Original file line number Diff line number Diff line change
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library LibRandomizer {
error ErrCeilingNotHigherThanFloor(uint256 floor, uint256 ceiling);

/**
* @dev Returns a random value in range [0, upper)
*/
function random(uint256 upper, uint256[1] memory seed) internal pure returns (uint256 result) {
result = seed[0] % upper;
seed[0] = uint256(keccak256(abi.encodePacked(seed[0])));
}

/**
* @dev Returns a random value in range [floor, ceiling], i.e the range is inclusive.
* When floor == ceiling = `x`, the random result always be equal to `x`.
*/
function randomRange(uint256 floor, uint256 ceiling, uint256[1] memory seed) internal pure returns (uint256) {
if (floor > ceiling) revert ErrCeilingNotHigherThanFloor(floor, ceiling);
return floor + random(ceiling - floor + 1, seed);
}
}