Remove ERC777

contracts/interfaces/IERC777.sol

@@ -1,6 +1,199 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts v4.4.1 (interfaces/IERC777.sol)
 
 pragma solidity ^0.8.0;
 
-import "../token/ERC777/IERC777.sol";
+/**
+ * @dev Interface of the ERC777Token standard as defined in the EIP.
+ *
+ * This contract uses the
+ * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 registry standard] to let
+ * token holders and recipients react to token movements by using setting implementers
+ * for the associated interfaces in said registry. See {IERC1820Registry} and
+ * {ERC1820Implementer}.
+ */
+interface IERC777 {
+    /**
+     * @dev Emitted when `amount` tokens are created by `operator` and assigned to `to`.
+     *
+     * Note that some additional user `data` and `operatorData` can be logged in the event.
+     */
+    event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);
+
+    /**
+     * @dev Emitted when `operator` destroys `amount` tokens from `account`.
+     *
+     * Note that some additional user `data` and `operatorData` can be logged in the event.
+     */
+    event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData);
+
+    /**
+     * @dev Emitted when `operator` is made operator for `tokenHolder`.
+     */
+    event AuthorizedOperator(address indexed operator, address indexed tokenHolder);
+
+    /**
+     * @dev Emitted when `operator` is revoked its operator status for `tokenHolder`.
+     */
+    event RevokedOperator(address indexed operator, address indexed tokenHolder);
+
+    /**
+     * @dev Returns the name of the token.
+     */
+    function name() external view returns (string memory);
+
+    /**
+     * @dev Returns the symbol of the token, usually a shorter version of the
+     * name.
+     */
+    function symbol() external view returns (string memory);
+
+    /**
+     * @dev Returns the smallest part of the token that is not divisible. This
+     * means all token operations (creation, movement and destruction) must have
+     * amounts that are a multiple of this number.
+     *
+     * For most token contracts, this value will equal 1.
+     */
+    function granularity() external view returns (uint256);
+
+    /**
+     * @dev Returns the amount of tokens in existence.
+     */
+    function totalSupply() external view returns (uint256);
+
+    /**
+     * @dev Returns the amount of tokens owned by an account (`owner`).
+     */
+    function balanceOf(address owner) external view returns (uint256);
+
+    /**
+     * @dev Moves `amount` tokens from the caller's account to `recipient`.
+     *
+     * If send or receive hooks are registered for the caller and `recipient`,
+     * the corresponding functions will be called with `data` and empty
+     * `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
+     *
+     * Emits a {Sent} event.
+     *
+     * Requirements
+     *
+     * - the caller must have at least `amount` tokens.
+     * - `recipient` cannot be the zero address.
+     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
+     * interface.
+     */
+    function send(address recipient, uint256 amount, bytes calldata data) external;
+
+    /**
+     * @dev Destroys `amount` tokens from the caller's account, reducing the
+     * total supply.
+     *
+     * If a send hook is registered for the caller, the corresponding function
+     * will be called with `data` and empty `operatorData`. See {IERC777Sender}.
+     *
+     * Emits a {Burned} event.
+     *
+     * Requirements
+     *
+     * - the caller must have at least `amount` tokens.
+     */
+    function burn(uint256 amount, bytes calldata data) external;
+
+    /**
+     * @dev Returns true if an account is an operator of `tokenHolder`.
+     * Operators can send and burn tokens on behalf of their owners. All
+     * accounts are their own operator.
+     *
+     * See {operatorSend} and {operatorBurn}.
+     */
+    function isOperatorFor(address operator, address tokenHolder) external view returns (bool);
+
+    /**
+     * @dev Make an account an operator of the caller.
+     *
+     * See {isOperatorFor}.
+     *
+     * Emits an {AuthorizedOperator} event.
+     *
+     * Requirements
+     *
+     * - `operator` cannot be calling address.
+     */
+    function authorizeOperator(address operator) external;
+
+    /**
+     * @dev Revoke an account's operator status for the caller.
+     *
+     * See {isOperatorFor} and {defaultOperators}.
+     *
+     * Emits a {RevokedOperator} event.
+     *
+     * Requirements
+     *
+     * - `operator` cannot be calling address.
+     */
+    function revokeOperator(address operator) external;
+
+    /**
+     * @dev Returns the list of default operators. These accounts are operators
+     * for all token holders, even if {authorizeOperator} was never called on
+     * them.
+     *
+     * This list is immutable, but individual holders may revoke these via
+     * {revokeOperator}, in which case {isOperatorFor} will return false.
+     */
+    function defaultOperators() external view returns (address[] memory);
+
+    /**
+     * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must
+     * be an operator of `sender`.
+     *
+     * If send or receive hooks are registered for `sender` and `recipient`,
+     * the corresponding functions will be called with `data` and
+     * `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
+     *
+     * Emits a {Sent} event.
+     *
+     * Requirements
+     *
+     * - `sender` cannot be the zero address.
+     * - `sender` must have at least `amount` tokens.
+     * - the caller must be an operator for `sender`.
+     * - `recipient` cannot be the zero address.
+     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
+     * interface.
+     */
+    function operatorSend(
+        address sender,
+        address recipient,
+        uint256 amount,
+        bytes calldata data,
+        bytes calldata operatorData
+    ) external;
+
+    /**
+     * @dev Destroys `amount` tokens from `account`, reducing the total supply.
+     * The caller must be an operator of `account`.
+     *
+     * If a send hook is registered for `account`, the corresponding function
+     * will be called with `data` and `operatorData`. See {IERC777Sender}.
+     *
+     * Emits a {Burned} event.
+     *
+     * Requirements
+     *
+     * - `account` cannot be the zero address.
+     * - `account` must have at least `amount` tokens.
+     * - the caller must be an operator for `account`.
+     */
+    function operatorBurn(address account, uint256 amount, bytes calldata data, bytes calldata operatorData) external;
+
+    event Sent(
+        address indexed operator,
+        address indexed from,
+        address indexed to,
+        uint256 amount,
+        bytes data,
+        bytes operatorData
+    );
+}

contracts/interfaces/IERC777Recipient.sol

@@ -1,6 +1,34 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts v4.4.1 (interfaces/IERC777Recipient.sol)
 
 pragma solidity ^0.8.0;
 
-import "../token/ERC777/IERC777Recipient.sol";
+/**
+ * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP.
+ *
+ * Accounts can be notified of {IERC777} tokens being sent to them by having a
+ * contract implement this interface (contract holders can be their own
+ * implementer) and registering it on the
+ * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry].
+ *
+ * See {IERC1820Registry} and {ERC1820Implementer}.
+ */
+interface IERC777Recipient {
+    /**
+     * @dev Called by an {IERC777} token contract whenever tokens are being
+     * moved or created into a registered account (`to`). The type of operation
+     * is conveyed by `from` being the zero address or not.
+     *
+     * This call occurs _after_ the token contract's state is updated, so
+     * {IERC777-balanceOf}, etc., can be used to query the post-operation state.
+     *
+     * This function may revert to prevent the operation from being executed.
+     */
+    function tokensReceived(
+        address operator,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata userData,
+        bytes calldata operatorData
+    ) external;
+}

contracts/interfaces/IERC777Sender.sol

@@ -1,6 +1,34 @@
 // SPDX-License-Identifier: MIT
-// OpenZeppelin Contracts v4.4.1 (interfaces/IERC777Sender.sol)
 
 pragma solidity ^0.8.0;
 
-import "../token/ERC777/IERC777Sender.sol";
+/**
+ * @dev Interface of the ERC777TokensSender standard as defined in the EIP.
+ *
+ * {IERC777} Token holders can be notified of operations performed on their
+ * tokens by having a contract implement this interface (contract holders can be
+ * their own implementer) and registering it on the
+ * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry].
+ *
+ * See {IERC1820Registry} and {ERC1820Implementer}.
+ */
+interface IERC777Sender {
+    /**
+     * @dev Called by an {IERC777} token contract whenever a registered holder's
+     * (`from`) tokens are about to be moved or destroyed. The type of operation
+     * is conveyed by `to` being the zero address or not.
+     *
+     * This call occurs _before_ the token contract's state is updated, so
+     * {IERC777-balanceOf}, etc., can be used to query the pre-operation state.
+     *
+     * This function may revert to prevent the operation from being executed.
+     */
+    function tokensToSend(
+        address operator,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata userData,
+        bytes calldata operatorData
+    ) external;
+}