53 lines
1.8 KiB
Solidity
53 lines
1.8 KiB
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
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/**
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* @title PolicyMath
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* @notice Deterministic GRU M0/M1 rules: 1.2× reserves on M0; ≤5× M1 vs M0 per line.
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* @dev Must match docs/hybx-omnl/HYBX_OMNL_POLICY_SPEC.md
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*/
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library PolicyMath {
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uint256 internal constant M0_NUM = 12;
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uint256 internal constant M0_DEN = 10;
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uint256 internal constant M1_CAP_NUM = 5;
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uint256 internal constant M1_CAP_DEN = 1;
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/// @notice Minimum reserves R required to back S0 units of M0 (ceil(1.2 * S0)).
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function minReservesForM0(uint256 s0) internal pure returns (uint256) {
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return Math.mulDiv(s0, M0_NUM, M0_DEN, Math.Rounding.Ceil);
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}
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/// @notice Maximum M1 supply allowed for S0 units of M0 (5 * S0).
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function maxM1ForM0(uint256 s0) internal pure returns (uint256) {
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return Math.mulDiv(s0, M1_CAP_NUM, M1_CAP_DEN);
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}
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function m0BackingOk(uint256 s0, uint256 r) internal pure returns (bool) {
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return r >= minReservesForM0(s0);
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}
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function m1ExpansionOk(uint256 s0, uint256 s1) internal pure returns (bool) {
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return s1 <= maxM1ForM0(s0);
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}
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function isCompliant(uint256 s0, uint256 s1, uint256 r) internal pure returns (bool) {
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return m0BackingOk(s0, r) && m1ExpansionOk(s0, s1);
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}
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function canMintM0(uint256 s0Before, uint256 mintAmount, uint256 r) internal pure returns (bool) {
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unchecked {
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uint256 s0After = s0Before + mintAmount;
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return m0BackingOk(s0After, r);
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}
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}
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function canMintM1(uint256 s0, uint256 s1Before, uint256 mintAmount) internal pure returns (bool) {
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unchecked {
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uint256 s1After = s1Before + mintAmount;
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return m1ExpansionOk(s0, s1After);
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}
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}
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}
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