LinearIncreasingCurve

{{
  "language": "Solidity",
  "sources": {
    "lib/ve-governance/src/curve/LinearIncreasingCurve.sol": {
      "content": "/// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

// interfaces
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IDAO} from "@aragon/osx-commons-contracts/src/dao/IDAO.sol";
import {
    IVotingEscrowIncreasingV1_2_0 as IVotingEscrow
} from "@escrow/IVotingEscrowIncreasing_v1_2_0.sol";
import {
    IEscrowCurveIncreasingV1_2_0 as IEscrowCurve,
    IEscrowCurveGlobal,
    IEscrowCurveCore,
    IEscrowCurveTokenV1_2_0 as IEscrowCurveToken
} from "@curve/IEscrowCurveIncreasing_v1_2_0.sol";

import {IClockUser, IClockV1_2_0 as IClock} from "@clock/IClock_v1_2_0.sol";

// libraries
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
import {SignedFixedPointMath} from "@libs/SignedFixedPointMathLib.sol";
import {CurveConstantLib} from "@libs/CurveConstantLib.sol";

// contracts
import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import {
    ReentrancyGuardUpgradeable as ReentrancyGuard
} from "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import {
    DaoAuthorizableUpgradeable as DaoAuthorizable
} from "@aragon/osx-commons-contracts/src/permission/auth/DaoAuthorizableUpgradeable.sol";

/// @title Linear Increasing Escrow Curve
contract LinearIncreasingCurve is
    IEscrowCurve,
    IClockUser,
    ReentrancyGuard,
    DaoAuthorizable,
    UUPSUpgradeable
{
    using SafeERC20 for IERC20;
    using SafeCast for int256;
    using SafeCast for uint256;
    using SignedFixedPointMath for int256;

    /// @notice Administrator role for the contract
    bytes32 public constant CURVE_ADMIN_ROLE = keccak256("CURVE_ADMIN_ROLE");

    /// @notice The VotingEscrow contract address
    address public escrow;

    /// @notice The Clock contract address
    address public clock;

    /// @notice tokenId => latest index: incremented on a per-tokenId basis
    /// @custom:oz-renamed-from tokenPointIntervals
    mapping(uint256 => uint256) public tokenPointLatestIndex;

    /// @notice The warmup period for the curve
    /// @dev Deprecated in this version, but kept for backwards compatibility.
    uint48 public warmupPeriod;

    /// @dev tokenId => tokenPointIntervals => TokenPoint
    /// @dev The Array is fixed so we can write to it in the future
    /// This implementation means that very short intervals may be challenging
    mapping(uint256 => TokenPoint[1_000_000_000]) internal _tokenPointHistory;

    /*//////////////////////////////////////////////////////////////
                                MATH
    //////////////////////////////////////////////////////////////*/

    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    int256 private immutable SHARED_QUADRATIC_COEFFICIENT;
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    int256 private immutable SHARED_LINEAR_COEFFICIENT;
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    int256 private immutable SHARED_CONSTANT_COEFFICIENT;
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    uint256 private immutable MAX_EPOCHS;

    /*//////////////////////////////////////////////////////////////
                            ADDED: TOTAL SUPPLY(1.2.0)
    //////////////////////////////////////////////////////////////*/

    /// @dev The latest global point index.
    uint256 public globalPointLatestIndex;

    // endTime => summed up slopes at that endTime
    mapping(uint256 => int256) public slopeChanges;

    /// @dev The global point history
    mapping(uint256 => GlobalPoint) internal _globalPointHistory;

    /*//////////////////////////////////////////////////////////////
                              INITIALIZATION
    //////////////////////////////////////////////////////////////*/

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor(int256[3] memory _coefficients, uint256 _maxEpochs) {
        SHARED_CONSTANT_COEFFICIENT = _coefficients[0];
        SHARED_LINEAR_COEFFICIENT = _coefficients[1];
        SHARED_QUADRATIC_COEFFICIENT = _coefficients[2];

        MAX_EPOCHS = _maxEpochs;

        _disableInitializers();
    }

    /// @param _escrow VotingEscrow contract address
    function initialize(address _escrow, address _dao, address _clock) external initializer {
        escrow = _escrow;
        clock = _clock;

        __ReentrancyGuard_init();
        __DaoAuthorizableUpgradeable_init(IDAO(_dao));

        // other initializers are empty
    }

    /*//////////////////////////////////////////////////////////////
                              CURVE COEFFICIENTS
    //////////////////////////////////////////////////////////////*/

    /// @return The coefficient for the curve's linear term, for the given amount
    function _getLinearCoeff(uint256 amount) internal view virtual returns (int256) {
        return amount.toInt256() * SHARED_LINEAR_COEFFICIENT;
    }

    /// @return The constant coefficient of the increasing curve, for the given amount
    /// @dev In this case, the constant term is 1 so we just case the amount
    function _getConstantCoeff(uint256 amount) internal view virtual returns (int256) {
        return amount.toInt256() * SHARED_CONSTANT_COEFFICIENT;
    }

    /// @return The coefficients of the quadratic curve, for the given amount
    /// @dev The coefficients are returned in the order [constant, linear, quadratic]
    function _getCoefficients(uint256 amount) internal view virtual returns (int256[3] memory) {
        return [_getConstantCoeff(amount), _getLinearCoeff(amount), 0];
    }

    /// @return The coefficients of the quadratic curve, for the given amount
    /// @dev The coefficients are returned in the order [constant, linear, quadratic]
    /// and are converted to regular 256-bit signed integers instead of their fixed-point representation
    function getCoefficients(uint256 amount) public view virtual returns (int256[3] memory) {
        int256[3] memory coefficients = _getCoefficients(amount);

        return [
            coefficients[0] / 1e18, // amount
            coefficients[1] / 1e18, // slope
            0
        ];
    }

    /*//////////////////////////////////////////////////////////////
                              CURVE BIAS
    //////////////////////////////////////////////////////////////*/

    /// @notice Rounds `_elapsed` to maxTime if it's greater, otherwise returns `_elapsed`.
    function boundElapsedMaxTime(uint256 _elapsed) private view returns (uint256) {
        uint256 MAX_TIME = maxTime();
        return _elapsed > MAX_TIME ? MAX_TIME : _elapsed;
    }

    /// @notice Returns the bias for the given time elapsed and amount, up to the maximum time
    function getBias(uint256 timeElapsed, uint256 amount) public view returns (uint256) {
        int256[3] memory coefficients = _getCoefficients(amount);
        uint256 bias = _getBias(boundElapsedMaxTime(timeElapsed), coefficients[0], coefficients[1]);

        return bias / 1e18;
    }

    /// @notice Returns the bias for the given time elapsed and amount, up to the maximum time
    /// @dev Returned values from these functions are in fixed point representation
    ///    which is not the case in `getBias`.
    function _getBias(
        uint256 _timeElapsed,
        int256 _constantCoeff,
        int256 _linearCoeff
    ) internal pure returns (uint256) {
        int256 bias = _linearCoeff * int256(_timeElapsed) + _constantCoeff;
        if (bias < 0) bias = 0;

        return bias.toUint256();
    }

    function _getBiasAndSlope(
        uint256 _timeElapsed,
        uint256 _amount
    ) public view returns (int256, int256) {
        int256 slope = _getLinearCoeff(_amount);
        uint256 bias = _getBias(
            boundElapsedMaxTime(_timeElapsed),
            _getConstantCoeff(_amount),
            slope
        );

        return (int256(bias), slope);
    }

    function maxTime() public view virtual returns (uint256) {
        return IClock(clock).epochDuration() * MAX_EPOCHS;
    }

    function previewMaxBias(uint256 amount) external view returns (uint256) {
        return getBias(maxTime(), amount);
    }

    /*//////////////////////////////////////////////////////////////
                              BALANCE
    //////////////////////////////////////////////////////////////*/

    /// @inheritdoc IEscrowCurveToken
    function tokenPointHistory(
        uint256 _tokenId,
        uint256 _index
    ) external view returns (TokenPoint memory point) {
        point = _tokenPointHistory[_tokenId][_index];
        /// bind for backwards compatibility
        point.bias = uint(point.coefficients[0]) / 1e18;
    }

    /// @inheritdoc IEscrowCurveGlobal
    function globalPointHistory(uint256 _index) public view returns (GlobalPoint memory) {
        return _globalPointHistory[_index];
    }

    /// @inheritdoc IEscrowCurveToken
    function tokenPointIntervals(uint256 _tokenId) external view returns (uint256) {
        return tokenPointLatestIndex[_tokenId];
    }

    /// @inheritdoc IEscrowCurveCore
    function votingPowerAt(uint256 _tokenId, uint256 _t) external view returns (uint256) {
        uint256 interval = _getPastTokenPointInterval(_tokenId, _t);

        // epoch 0 is an empty point
        if (interval == 0) return 0;

        // Note that very first point is saved at index 1.
        // Grab original point(the very first point for `_tokenId`).
        TokenPoint memory originalPoint = _tokenPointHistory[_tokenId][1];

        // Grab last point before `_t`.
        TokenPoint memory lastPoint = _tokenPointHistory[_tokenId][interval];
        int256 bias = lastPoint.coefficients[0];
        int256 slope = lastPoint.coefficients[1];

        uint256 end = originalPoint.checkpointTs + maxTime();

        // If the point was created before the upgrade:
        //    it will have `checkpointTs` greater than `writtenTs`.
        //    bias would have been stored as just the amount(without bonus).
        // In such case, we make writtenTs equal to avoid checkpointTs greater.
        // This ensures that behaviour after and before upgrade are same.
        if (lastPoint.checkpointTs > lastPoint.writtenTs) {
            lastPoint.writtenTs = lastPoint.checkpointTs;
            if (_t < lastPoint.writtenTs) return 0;
        }

        uint256 elapsed = _t - lastPoint.writtenTs;

        uint256 timeTillMaxTime = 0;
        if (end > lastPoint.writtenTs) {
            timeTillMaxTime = end - lastPoint.writtenTs;
        }

        if (elapsed >= timeTillMaxTime) {
            elapsed = timeTillMaxTime;
        }

        return _getBias(elapsed, bias, slope) / 1e18;
    }

    /// @inheritdoc IEscrowCurveCore
    function supplyAt(uint256 _timestamp) external view returns (uint256) {
        return _supplyAt(_timestamp);
    }

    /*//////////////////////////////////////////////////////////////
                              CHECKPOINT
    //////////////////////////////////////////////////////////////*/

    /// @notice A checkpoint can be called by the VotingEscrow contract to snapshot the user's voting power
    function checkpoint(
        uint256 _tokenId,
        IVotingEscrow.LockedBalance memory _oldLocked,
        IVotingEscrow.LockedBalance memory _newLocked
    ) external nonReentrant {
        if (msg.sender != escrow) revert OnlyEscrow();
        _checkpoint(_tokenId, _oldLocked, _newLocked);
    }

    /// @notice Record user data to checkpoints. Used by VotingEscrow system.
    /// @param _tokenId NFT token ID.
    /// @param _fromLocked The locked from which we're moving.
    /// @param _newLocked New locked amount / end lock time for the user
    function _checkpoint(
        uint256 _tokenId,
        IVotingEscrow.LockedBalance memory _fromLocked,
        IVotingEscrow.LockedBalance memory _newLocked
    ) internal {
        // this implementation doesn't yet support manual checkpointing
        if (_tokenId == 0) revert InvalidTokenId();

        if (_newLocked.start < _fromLocked.start) {
            revert InvalidCheckpoint();
        }

        uint256 _globalPointLatestIndex = globalPointLatestIndex;

        // Get the slope and bias for `_newLocked`...
        (int256 newLockBias, int256 newLockSlope) = _getBiasAndSlope(
            block.timestamp - _newLocked.start,
            _newLocked.amount
        );

        GlobalPoint memory lastPoint = GlobalPoint({
            bias: 0,
            slope: 0,
            writtenTs: uint48(block.timestamp)
        });

        if (_globalPointLatestIndex > 0) {
            lastPoint = _globalPointHistory[_globalPointLatestIndex];
        }

        {
            uint256 checkpointInterval = IClock(clock).checkpointInterval();

            // For safety reasons, we don't allow checkpoints
            // on the exact checkpointInterval.
            if (block.timestamp % checkpointInterval == 0) {
                revert CheckpointOnDepositIntervalNotAllowed();
            }

            uint256 lastPointCheckpoint = lastPoint.writtenTs;
            uint256 t_i = (lastPointCheckpoint / checkpointInterval) * checkpointInterval;

            for (uint256 i = 0; i < 255; ++i) {
                t_i += checkpointInterval;
                int256 dSlope;

                if (t_i > block.timestamp) {
                    t_i = block.timestamp;
                } else {
                    dSlope = slopeChanges[t_i];
                }

                lastPoint.bias += lastPoint.slope * int256(t_i - lastPointCheckpoint);
                lastPoint.slope -= dSlope;

                if (lastPoint.slope < 0) lastPoint.slope = 0;
                if (lastPoint.bias < 0) lastPoint.bias = 0;

                lastPointCheckpoint = t_i;
                lastPoint.writtenTs = uint48(t_i);
                _globalPointLatestIndex += 1;

                if (t_i == block.timestamp) {
                    break;
                } else {
                    _globalPointHistory[_globalPointLatestIndex] = lastPoint;
                }
            }
        }

        uint256 _maxTime = maxTime();
        uint256 newLockedEnd = _newLocked.start + _maxTime;
        uint256 fromLockedEnd = _fromLocked.start + _maxTime;

        // The following condition is true if merging non-mature locks with different start dates.
        // current version of ve-governance is built around the assumption that merge can only
        // occur if tokens are either mature or have the same start dates. Even though `escrow`
        // does this check before calling `checkpoint` on curve, it's still a safety measure to repeat
        // the check in case the code of checkpoint might be called by another contract in the future.
        if (
            _fromLocked.start != 0 &&
            _newLocked.start != 0 &&
            _fromLocked.start != _newLocked.start &&
            (newLockedEnd >= block.timestamp || fromLockedEnd >= block.timestamp)
        ) {
            revert InvalidLocks(_tokenId, _fromLocked, _newLocked);
        }

        // newLocked could be ended in case of merge, when
        // a token is already mature.
        if (newLockedEnd <= block.timestamp) {
            newLockSlope = 0;
        }

        (int256 oldLockBias, int256 oldLockSlope) = (0, 0);

        if (_fromLocked.amount > 0) {
            (oldLockBias, oldLockSlope) = _getBiasAndSlope(
                block.timestamp - _fromLocked.start,
                _fromLocked.amount
            );

            // In case fromLocked already ended, its slope would already
            // be subtracted from `lastPoint.slope` in the above for loop.
            // So we make this 0 to not subtract double times.
            if (fromLockedEnd <= block.timestamp) {
                oldLockSlope = 0;
            }
        }

        lastPoint.bias += (newLockBias - oldLockBias);
        lastPoint.slope += (newLockSlope - oldLockSlope);

        if (lastPoint.slope < 0) lastPoint.slope = 0;
        if (lastPoint.bias < 0) lastPoint.bias = 0;

        uint256 tokenLatestIndex = tokenPointLatestIndex[_tokenId];

        // The token point already exists..
        if (tokenLatestIndex > 0) {
            if (fromLockedEnd > block.timestamp) {
                slopeChanges[fromLockedEnd] -= oldLockSlope;
            }
        }

        // store new slope change
        slopeChanges[newLockedEnd] += newLockSlope;

        // Record the latest global point.
        _storeLatestGlobalPoint(lastPoint, _globalPointLatestIndex);

        // Create new token point and store.
        TokenPoint memory tNew;
        tNew.writtenTs = uint128(block.timestamp);
        tNew.checkpointTs = _newLocked.start;
        tNew.coefficients = [newLockBias, newLockSlope, 0];

        // Record the latest token point.
        _storeLatestTokenPoint(tNew, _tokenId, tokenLatestIndex);
    }

    /// @dev The private helper function to either store latest global point on a new index or overwrite it.
    ///      In case of overwriting, the latest global point index is not incremented.
    function _storeLatestGlobalPoint(GlobalPoint memory _p, uint256 _index) private {
        // If the timestamp of last stored global point is the same as
        // current timestamp, overwrite it, otherwise store a new one
        // to reduce unnecessary global points in the history for
        // gas costs and binary search efficiency.
        if (_index != 1 && _globalPointHistory[_index - 1].writtenTs == block.timestamp) {
            _globalPointHistory[_index - 1] = _p;
        } else {
            globalPointLatestIndex = _index;
            _globalPointHistory[_index] = _p;
        }
    }

    /// @dev The private helper function to either store latest token point on a new index or overwrite it.
    ///      In case of overwriting, the latest token point index is not incremented.
    function _storeLatestTokenPoint(
        TokenPoint memory _p,
        uint256 _tokenId,
        uint256 _index
    ) private {
        // If the timestamp of last stored token point is the same as
        // current timestamp, overwrite it, otherwise store a new one
        // to reduce unnecessary global points in the history for
        // gas costs and binary search efficiency.
        if (_index != 0 && _tokenPointHistory[_tokenId][_index].writtenTs == block.timestamp) {
            _tokenPointHistory[_tokenId][_index] = _p;
        } else {
            tokenPointLatestIndex[_tokenId] = ++_index;
            _tokenPointHistory[_tokenId][_index] = _p;
        }
    }

    /*///////////////////////////////////////////////////////////////
            Total Supply and Voting Power Calculations
    //////////////////////////////////////////////////////////////*/

    /// @notice Binary search to get the token point interval for a token id at or prior to a given timestamp
    /// Once we have the point , we can apply the bias calculation to get the voting power.
    /// @dev If a token point does not exist prior to the timestamp, this will return 0.
    function _getPastTokenPointInterval(
        uint256 _tokenId,
        uint256 _timestamp
    ) internal view returns (uint256) {
        uint256 tokenInterval = tokenPointLatestIndex[_tokenId];

        if (tokenInterval == 0) return 0;

        // if the most recent point is before the timestamp, return it
        if (_tokenPointHistory[_tokenId][tokenInterval].writtenTs <= _timestamp)
            return (tokenInterval);

        // Check if the first balance is after the timestamp
        // this means that the first epoch has yet to start
        if (_tokenPointHistory[_tokenId][1].writtenTs > _timestamp) return 0;

        uint256 lower = 0;
        uint256 upper = tokenInterval;
        while (upper > lower) {
            uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            TokenPoint storage tokenPoint = _tokenPointHistory[_tokenId][center];
            if (tokenPoint.writtenTs == _timestamp) {
                return center;
            } else if (tokenPoint.writtenTs < _timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    /// @notice Binary search to get the global point index at or prior to a given timestamp
    /// @dev If a checkpoint does not exist prior to the timestamp, this will return 0.
    /// @param _timestamp The timestamp to get a checkpoint at.
    /// @return Global point index
    function getPastGlobalPointIndex(uint256 _timestamp) internal view returns (uint256) {
        if (globalPointLatestIndex == 0) return 0;
        // First check most recent balance
        if (_globalPointHistory[globalPointLatestIndex].writtenTs <= _timestamp)
            return (globalPointLatestIndex);
        // Next check implicit zero balance
        if (_globalPointHistory[1].writtenTs > _timestamp) return 0;

        uint256 lower = 0;
        uint256 upper = globalPointLatestIndex;
        while (upper > lower) {
            uint256 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            GlobalPoint storage globalPoint = _globalPointHistory[center];
            if (globalPoint.writtenTs == _timestamp) {
                return center;
            } else if (globalPoint.writtenTs < _timestamp) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return lower;
    }

    /// @notice Calculate total voting power at some point in the past
    /// @param _timestamp Time to calculate the total voting power at
    /// @return Total voting power at that time
    function _supplyAt(uint256 _timestamp) internal view returns (uint256) {
        uint256 epoch_ = getPastGlobalPointIndex(_timestamp);
        // epoch 0 is an empty point
        if (epoch_ == 0) return 0;
        GlobalPoint memory _point = _globalPointHistory[epoch_];

        int256 bias = _point.bias;
        int256 slope = _point.slope;
        uint256 ts = _point.writtenTs; // changes in for loop.

        uint256 checkpointInterval = IClock(clock).checkpointInterval();

        uint256 t_i = (ts / checkpointInterval) * checkpointInterval;

        for (uint256 i = 0; i < 255; ++i) {
            t_i += checkpointInterval;
            int256 dSlope = 0;

            if (t_i > _timestamp) {
                t_i = _timestamp;
            } else {
                dSlope = slopeChanges[t_i];
            }

            bias += slope * int256(t_i - ts);

            if (t_i == _timestamp) {
                break;
            }
            slope -= dSlope;
            ts = t_i;
        }

        if (bias < 0) bias = 0;

        return uint256(bias / 1e18);
    }

    /*///////////////////////////////////////////////////////////////
                            UUPS Upgrade
    //////////////////////////////////////////////////////////////*/

    /// @notice Returns the address of the implementation contract in the [proxy storage slot](https://eips.ethereum.org/EIPS/eip-1967) slot the [UUPS proxy](https://eips.ethereum.org/EIPS/eip-1822) is pointing to.
    /// @return The address of the implementation contract.
    function implementation() public view returns (address) {
        return _getImplementation();
    }

    /// @notice Internal method authorizing the upgrade of the contract via the [upgradeability mechanism for UUPS proxies](https://docs.openzeppelin.com/contracts/4.x/api/proxy#UUPSUpgradeable) (see [ERC-1822](https://eips.ethereum.org/EIPS/eip-1822)).
    function _authorizeUpgrade(address) internal virtual override auth(CURVE_ADMIN_ROLE) {}

    /// @dev Reserved storage space to allow for layout changes in the future.
    uint256[42] private __gap;

    /*//////////////////////////////////////////////////////////////
                          DEPRECATED: Warmup
    //////////////////////////////////////////////////////////////*/

    function setWarmupPeriod(uint48) external pure {
        revert Deprecated();
    }

    /// @notice Returns whether the NFT is warm
    /// @dev In this version, warm functionality has been deprecated.
    ///      For backwards compatibility, always return true.
    function isWarm(uint256) public pure virtual returns (bool) {
        return true;
    }

    /// @notice Returns whether the NFT is warm at the specified timestamp(`_ts`)
    /// @dev In this version, warm functionality has been deprecated.
    ///      For backwards compatibility, always return true.
    function isWarm(uint256, uint48) public pure virtual returns (bool) {
        return true;
    }
}
"
    },
    "lib/token-voting-plugin/lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
"
    },
    "lib/ve-governance/lib/osx-commons/contracts/src/dao/IDAO.sol": {
      "content": "// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity ^0.8.8;

/// @title IDAO
/// @author Aragon X - 2022-2024
/// @notice The interface required for DAOs within the Aragon App DAO framework.
/// @custom:security-contact sirt@aragon.org
interface IDAO {
    /// @notice Checks if an address has permission on a contract via a permission identifier and considers if `ANY_ADDRESS` was used in the granting process.
    /// @param _where The address of the contract.
    /// @param _who The address of a EOA or contract to give the permissions.
    /// @param _permissionId The permission identifier.
    /// @param _data The optional data passed to the `PermissionCondition` registered.
    /// @return Returns true if the address has permission, false if not.
    function hasPermission(
        address _where,
        address _who,
        bytes32 _permissionId,
        bytes memory _data
    ) external view returns (bool);

    /// @notice Updates the DAO metadata (e.g., an IPFS hash).
    /// @param _metadata The IPFS hash of the new metadata object.
    function setMetadata(bytes calldata _metadata) external;

    /// @notice Emitted when the DAO metadata is updated.
    /// @param metadata The IPFS hash of the new metadata object.
    event MetadataSet(bytes metadata);

    /// @notice Emitted when a standard callback is registered.
    /// @param interfaceId The ID of the interface.
    /// @param callbackSelector The selector of the callback function.
    /// @param magicNumber The magic number to be registered for the callback function selector.
    event StandardCallbackRegistered(
        bytes4 interfaceId,
        bytes4 callbackSelector,
        bytes4 magicNumber
    );

    /// @notice Deposits (native) tokens to the DAO contract with a reference string.
    /// @param _token The address of the token or address(0) in case of the native token.
    /// @param _amount The amount of tokens to deposit.
    /// @param _reference The reference describing the deposit reason.
    function deposit(address _token, uint256 _amount, string calldata _reference) external payable;

    /// @notice Emitted when a token deposit has been made to the DAO.
    /// @param sender The address of the sender.
    /// @param token The address of the deposited token.
    /// @param amount The amount of tokens deposited.
    /// @param _reference The reference describing the deposit reason.
    event Deposited(
        address indexed sender,
        address indexed token,
        uint256 amount,
        string _reference
    );

    /// @notice Emitted when a native token deposit has been made to the DAO.
    /// @dev This event is intended to be emitted in the `receive` function and is therefore bound by the gas limitations for `send`/`transfer` calls introduced by [ERC-2929](https://eips.ethereum.org/EIPS/eip-2929).
    /// @param sender The address of the sender.
    /// @param amount The amount of native tokens deposited.
    event NativeTokenDeposited(address sender, uint256 amount);

    /// @notice Setter for the trusted forwarder verifying the meta transaction.
    /// @param _trustedForwarder The trusted forwarder address.
    function setTrustedForwarder(address _trustedForwarder) external;

    /// @notice Getter for the trusted forwarder verifying the meta transaction.
    /// @return The trusted forwarder address.
    function getTrustedForwarder() external view returns (address);

    /// @notice Emitted when a new TrustedForwarder is set on the DAO.
    /// @param forwarder the new forwarder address.
    event TrustedForwarderSet(address forwarder);

    /// @notice Checks whether a signature is valid for a provided hash according to [ERC-1271](https://eips.ethereum.org/EIPS/eip-1271).
    /// @param _hash The hash of the data to be signed.
    /// @param _signature The signature byte array associated with `_hash`.
    /// @return Returns the `bytes4` magic value `0x1626ba7e` if the signature is valid and `0xffffffff` if not.
    function isValidSignature(bytes32 _hash, bytes memory _signature) external returns (bytes4);

    /// @notice Registers an ERC standard having a callback by registering its [ERC-165](https://eips.ethereum.org/EIPS/eip-165) interface ID and callback function signature.
    /// @param _interfaceId The ID of the interface.
    /// @param _callbackSelector The selector of the callback function.
    /// @param _magicNumber The magic number to be registered for the function signature.
    function registerStandardCallback(
        bytes4 _interfaceId,
        bytes4 _callbackSelector,
        bytes4 _magicNumber
    ) external;

    /// @notice Removed function being left here to not corrupt the IDAO interface ID. Any call will revert.
    /// @dev Introduced in v1.0.0. Removed in v1.4.0.
    function setSignatureValidator(address) external;
}
"
    },
    "lib/ve-governance/src/escrow/IVotingEscrowIncreasing_v1_2_0.sol": {
      "content": "/// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IVotingEscrowIncreasing.sol";
import {IEscrowIVotesAdapter, IDelegateUpdateVotingPower} from "@delegation/IEscrowIVotesAdapter.sol";

interface IVotingEscrowExiting {
    /// @notice How much amount has been exiting.
    /// @return total The total amount for which beginWithdrawal has been called
    ///         but withdraw has not yet been executed.
    function currentExitingAmount() external view returns (uint256);
}

interface IMergeEventsAndErrors {
    event Merged(
        address indexed _sender,
        uint256 indexed _from,
        uint256 indexed _to,
        uint208 _amountFrom,
        uint208 _amountTo,
        uint208 _amountFinal
    );

    error CannotMerge(uint256 _from, uint256 _to);
    error SameNFT();
}

interface IMerge is ILockedBalanceIncreasing, IMergeEventsAndErrors {
    /// @notice Merge two tokens - i.e  `from` into `_to`.
    /// @param _from The token id from which merge is occuring
    /// @param _to The token id to which `_from` is merging
    function merge(uint256 _from, uint256 _to) external;

    /// @notice Whether 2 tokens can be merged.
    /// @param _from The token id from which merge should occur.
    /// @param _to The token id to which `_from` should merge.
    function canMerge(
        LockedBalance memory _from,
        LockedBalance memory _to
    ) external view returns (bool);
}

interface ISplitEventsAndErrors {
    event Split(
        uint256 indexed _from,
        uint256 indexed newTokenId,
        address _sender,
        uint208 _splitAmount1,
        uint208 _splitAmount2
    );

    event SplitWhitelistSet(address indexed account, bool status);

    error SplitNotWhitelisted();
    error SplitAmountTooBig();
}

interface ISplit is ISplitEventsAndErrors {
    /// @notice Split token into two new, separate tokens.
    /// @param _from The token id that should be split
    /// @param _value The amount that determines how token is split
    /// @return _newTokenId The new token id after split.
    function split(
        uint256 _from,
        uint256 _value
    ) external returns (uint256 _newTokenId);
}

interface IDelegateMoveVoteCaller {
    /// @notice After a token transfer, decreases `_from`'s voting power and increases `_to`'s voting power.
    /// @dev Called upon a token transfer.
    /// @param _from The current delegatee of `_tokenId`.
    /// @param _to The new delegatee of `_tokenId`
    /// @param _tokenId The token id that is being transferred.
    function moveDelegateVotes(
        address _from,
        address _to,
        uint256 _tokenId
    ) external;
}

interface IVotingEscrowIncreasingV1_2_0 is
    IVotingEscrowIncreasing,
    IVotingEscrowExiting,
    IMerge,
    ISplit,
    IDelegateUpdateVotingPower,
    IDelegateMoveVoteCaller
{}
"
    },
    "lib/ve-governance/src/curve/IEscrowCurveIncreasing_v1_2_0.sol": {
      "content": "/// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IEscrowCurveIncreasing.sol";
import "../IDeprecated.sol";

/*///////////////////////////////////////////////////////////////
                        Global Curve
//////////////////////////////////////////////////////////////*/

interface IEscrowCurveGlobalStorage {
    /// @notice Captures the shape of the aggregate voting curve at a specific point in time
    /// @param bias The y intercept of the aggregate voting curve at the given time
    /// @param slope The slope of the aggregate voting curve at the given time
    /// @param writtenTs The timestamp at which the we last updated the aggregate voting curve
    struct GlobalPoint {
        int256 bias;
        int256 slope;
        uint48 writtenTs;
    }
}

interface IEscrowCurveGlobal is IEscrowCurveGlobalStorage {
    /// @notice Returns the global point at the passed epoch
    /// @param _index The index in an array to return the point for
    function globalPointHistory(uint256 _index) external view returns (GlobalPoint memory);
}

/*///////////////////////////////////////////////////////////////
                        Token Curve
//////////////////////////////////////////////////////////////*/

interface IEscrowCurveTokenV1_2_0 is IEscrowCurveTokenStorage {
    /// @notice Returns the latest index of the tokenId which can be used
    ///         to retrive token point from `tokenPointHistory` function.
    /// @dev This has been renamed to `tokenPointLatestIndex` in the latest upgrade, but
    ///      for backwards-compatibility, the function still stays in the contract.
    ///      Note that we treat it as deprecated, So use `tokenPointLatestIndex` instead.
    /// @return The latest index of the token id.
    function tokenPointIntervals(uint256 _tokenId) external view returns (uint256);

    /// @notice Returns the latest index of the tokenId which can be used
    ///         to retrive token point from `tokenPointHistory` function.
    /// @param _tokenId The NFT to return the latest token point index
    /// @return The latest index of the token id.
    function tokenPointLatestIndex(uint256 _tokenId) external view returns (uint256);

    /// @notice Returns the TokenPoint at the passed `_index`.
    /// @param _tokenId The NFT to return the TokenPoint for
    /// @param _index The index to return the TokenPoint at.
    function tokenPointHistory(
        uint256 _tokenId,
        uint256 _index
    ) external view returns (TokenPoint memory);
}

interface IEscrowCurveMaxTime is IEscrowCurveErrorsAndEvents {
    /// @return The max time allowed for the lock duration.
    function maxTime() external view returns (uint256);
}

/*///////////////////////////////////////////////////////////////
                        INCREASING CURVE
//////////////////////////////////////////////////////////////*/

interface IEscrowCurveIncreasingV1_2_0 is
    IEscrowCurveCore,
    IEscrowCurveMath,
    IEscrowCurveTokenV1_2_0,
    IEscrowCurveMaxTime,
    IEscrowCurveGlobal,
    IDeprecated
{}

interface IEscrowCurveIncreasingV1_2_0_NoSupply is
    IEscrowCurveCore,
    IEscrowCurveMath,
    IEscrowCurveTokenV1_2_0,
    IEscrowCurveMaxTime,
    IDeprecated
{}
"
    },
    "lib/ve-governance/src/clock/IClock_v1_2_0.sol": {
      "content": "/// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./IClock.sol";

interface IClockV1_2_0 is IClock {
    function epochPrevCheckpointTs() external view returns (uint256);

    function resolveEpochPrevCheckpointTs(uint256 timestamp) external pure returns (uint256);
}
"
    },
    "lib/token-voting-plugin/lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}
"
    },
    "lib/token-voting-plugin/lib/openzeppelin-contracts/contracts/utils/math/SafeCast.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint248 from uint256, reverting on
     * overflow (when the input is greater than largest uint248).
     *
     * Counterpart to Solidity's `uint248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toUint248(uint256 value) internal pure returns (uint248) {
        require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
        return uint248(value);
    }

    /**
     * @dev Returns the downcasted uint240 from uint256, reverting on
     * overflow (when the input is greater than largest uint240).
     *
     * Counterpart to Solidity's `uint240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toUint240(uint256 value) internal pure returns (uint240) {
        require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
        return uint240(value);
    }

    /**
     * @dev Returns the downcasted uint232 from uint256, reverting on
     * overflow (when the input is greater than largest uint232).
     *
     * Counterpart to Solidity's `uint232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toUint232(uint256 value) internal pure returns (uint232) {
        require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
        return uint232(value);
    }

    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.2._
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint216 from uint256, reverting on
     * overflow (when the input is greater than largest uint216).
     *
     * Counterpart to Solidity's `uint216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toUint216(uint256 value) internal pure returns (uint216) {
        require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
        return uint216(value);
    }

    /**
     * @dev Returns the downcasted uint208 from uint256, reverting on
     * overflow (when the input is greater than largest uint208).
     *
     * Counterpart to Solidity's `uint208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toUint208(uint256 value) internal pure returns (uint208) {
        require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
        return uint208(value);
    }

    /**
     * @dev Returns the downcasted uint200 from uint256, reverting on
     * overflow (when the input is greater than largest uint200).
     *
     * Counterpart to Solidity's `uint200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toUint200(uint256 value) internal pure returns (uint200) {
        require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
        return uint200(value);
    }

    /**
     * @dev Returns the downcasted uint192 from uint256, reverting on
     * overflow (when the input is greater than largest uint192).
     *
     * Counterpart to Solidity's `uint192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toUint192(uint256 value) internal pure returns (uint192) {
        require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
        return uint192(value);
    }

    /**
     * @dev Returns the downcasted uint184 from uint256, reverting on
     * overflow (when the input is greater than largest uint184).
     *
     * Counterpart to Solidity's `uint184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toUint184(uint256 value) internal pure returns (uint184) {
        require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
        return uint184(value);
    }

    /**
     * @dev Returns the downcasted uint176 from uint256, reverting on
     * overflow (when the input is greater than largest uint176).
     *
     * Counterpart to Solidity's `uint176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toUint176(uint256 value) internal pure returns (uint176) {
        require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
        return uint176(value);
    }

    /**
     * @dev Returns the downcasted uint168 from uint256, reverting on
     * overflow (when the input is greater than largest uint168).
     *
     * Counterpart to Solidity's `uint168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toUint168(uint256 value) internal pure returns (uint168) {
        require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
        return uint168(value);
    }

    /**
     * @dev Returns the downcasted uint160 from uint256, reverting on
     * overflow (when the input is greater than largest uint160).
     *
     * Counterpart to Solidity's `uint160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toUint160(uint256 value) internal pure returns (uint160) {
        require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
        return uint160(value);
    }

    /**
     * @dev Returns the downcasted uint152 from uint256, reverting on
     * overflow (when the input is greater than largest uint152).
     *
     * Counterpart to Solidity's `uint152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toUint152(uint256 value) internal pure returns (uint152) {
        require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
        return uint152(value);
    }

    /**
     * @dev Returns the downcasted uint144 from uint256, reverting on
     * overflow (when the input is greater than largest uint144).
     *
     * Counterpart to Solidity's `uint144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toUint144(uint256 value) internal pure returns (uint144) {
        require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
        return uint144(value);
    }

    /**
     * @dev Returns the downcasted uint136 from uint256, reverting on
     * overflow (when the input is greater than largest uint136).
     *
     * Counterpart to Solidity's `uint136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toUint136(uint256 value) internal pure returns (uint136) {
        require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
        return uint136(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v2.5._
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint120 from uint256, reverting on
     * overflow (when the input is greater than largest uint120).
     *
     * Counterpart to Solidity's `uint120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toUint120(uint256 value) internal pure returns (uint120) {
        require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
        return uint120(value);
    }

    /**
     * @dev Returns the downcasted uint112 from uint256, reverting on
     * overflow (when the input is greater than largest uint112).
     *
     * Counterpart to Solidity's `uint112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toUint112(uint256 value) internal pure returns (uint112) {
        require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
        return uint112(value);
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     *
     * Counterpart to Solidity's `uint104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.2._
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint88 from uint256, reverting on
     * overflow (when the input is greater than largest uint88).
     *
     * Counterpart to Solidity's `uint88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toUint88(uint256 value) internal pure returns (uint88) {
        require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
        return uint88(value);
    }

    /**
     * @dev Returns the downcasted uint80 from uint256, reverting on
     * overflow (when the input is greater than largest uint80).
     *
     * Counterpart to Solidity's `uint80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toUint80(uint256 value) internal pure returns (uint80) {
        require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
        return uint80(value);
    }

    /**
     * @dev Returns the downcasted uint72 from uint256, reverting on
     * overflow (when the input is greater than largest uint72).
     *
     * Counterpart to Solidity's `uint72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toUint72(uint256 value) internal pure returns (uint72) {
        require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
        return uint72(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v2.5._
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint56 from uint256, reverting on
     * overflow (when the input is greater than largest uint56).
     *
     * Counterpart to Solidity's `uint56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toUint56(uint256 value) internal pure returns (uint56) {
        require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
        return uint56(value);
    }

    /**
     * @dev Returns the downcasted uint48 from uint256, reverting on
     * overflow (when the input is greater than largest uint48).
     *
     * Counterpart to Solidity's `uint48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toUint48(uint256 value) internal pure returns (uint48) {
        require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
        return uint48(value);
    }

    /**
     * @dev Returns the downcasted uint40 from uint256, reverting on
     * overflow (when the input is greater than largest uint40).
     *
     * Counterpart to Solidity's `uint40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toUint40(uint256 value) internal pure returns (uint40) {
        require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
        return uint40(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v2.5._
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint24 from uint256, reverting on
     * overflow (when the input is greater than largest uint24).
     *
     * Counterpart to Solidity's `uint24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toUint24(uint256 value) internal pure returns (uint24) {
        require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
        return uint24(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v2.5._
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v2.5._
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     *
     * _Available since v3.0._
     */
    function toUint256(int256 value) internal pure returns (uint256) {