Build theDecentralizedFuture

1// SPDX-License-Identifier: MIT
2pragma solidity ^0.8.24;
3
4import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
5import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
6import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Pausable.sol";
7import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Permit.sol";
8import "@openzeppelin/contracts/access/AccessControl.sol";
9
10contract SyntaxToken is
11    ERC20,
12    ERC20Burnable,
13    ERC20Pausable,
14    ERC20Permit,
15    AccessControl
16{
17    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
18    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
19    uint256 public constant MAX_SUPPLY = 100_000_000 ether;
20
21    error ZeroAddress();
22    error MaxSupplyExceeded(uint256 requested, uint256 available);
23
24    constructor(address admin, address treasury, uint256 initialSupply)
25        ERC20("Syntax Token", "SYNTX")
26        ERC20Permit("Syntax Token")
27    {
28        if (admin == address(0) || treasury == address(0)) {
29            revert ZeroAddress();
30        }
31        if (initialSupply > MAX_SUPPLY) {
32            revert MaxSupplyExceeded(initialSupply, MAX_SUPPLY);
33        }
34
35        _grantRole(DEFAULT_ADMIN_ROLE, admin);
36        _grantRole(MINTER_ROLE, admin);
37        _grantRole(PAUSER_ROLE, admin);
38        _mint(treasury, initialSupply);
39    }
40
41    function mint(address to, uint256 amount) external onlyRole(MINTER_ROLE) {
42        uint256 available = MAX_SUPPLY - totalSupply();
43        if (to == address(0)) revert ZeroAddress();
44        if (amount > available) {
45            revert MaxSupplyExceeded(amount, available);
46        }
47        _mint(to, amount);
48    }
49
50    function pause() external onlyRole(PAUSER_ROLE) {
51        _pause();
52    }
53
54    function unpause() external onlyRole(PAUSER_ROLE) {
55        _unpause();
56    }
57
58    function _update(address from, address to, uint256 value)
59        internal
60        override(ERC20, ERC20Pausable)
61    {
62        super._update(from, to, value);
63    }
64}