{
    "Function": "extend",
    "File": "src/DelegateToken.sol",
    "Parent Contracts": [
        "src/interfaces/IDelegateToken.sol",
        "lib/openzeppelin-contracts/contracts/interfaces/IERC2981.sol",
        "lib/openzeppelin-contracts/contracts/token/ERC1155/IERC1155Receiver.sol",
        "lib/openzeppelin-contracts/contracts/token/ERC721/IERC721Receiver.sol",
        "lib/openzeppelin-contracts/contracts/token/ERC721/extensions/IERC721Metadata.sol",
        "lib/openzeppelin-contracts/contracts/token/ERC721/IERC721.sol",
        "lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol",
        "lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol"
    ],
    "High-Level Calls": [
        "DelegateTokenStorageHelpers",
        "DelegateTokenStorageHelpers",
        "DelegateTokenStorageHelpers",
        "PrincipalToken",
        "DelegateTokenHelpers"
    ],
    "Internal Calls": [
        "revert NotApproved(address,uint256)",
        "revert ExpiryTooSmall()"
    ],
    "Library Calls": [
        "readExpiry",
        "revertOldExpiry",
        "writeExpiry",
        "revertNotMinted"
    ],
    "Low-Level Calls": [],
    "Code": "function extend(uint256 delegateTokenId, uint256 newExpiry) external {\n        StorageHelpers.revertNotMinted(delegateTokenInfo, delegateTokenId);\n        Helpers.revertOldExpiry(newExpiry);\n        uint256 previousExpiry = StorageHelpers.readExpiry(delegateTokenInfo, delegateTokenId);\n        if (newExpiry <= previousExpiry) revert Errors.ExpiryTooSmall();\n        if (PrincipalToken(principalToken).isApprovedOrOwner(msg.sender, delegateTokenId)) {\n            StorageHelpers.writeExpiry(delegateTokenInfo, delegateTokenId, newExpiry);\n            emit ExpiryExtended(delegateTokenId, previousExpiry, newExpiry);\n            return;\n        }\n        revert Errors.NotApproved(msg.sender, delegateTokenId);\n    }"
}