文件 1 的 1：ERC20.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
interface IERC20 {
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed _owner, address indexed spender, uint256 value);
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function allowance(address _owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
interface IERC20Metadata is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
interface IUniswapV2Router {
function factory() external pure returns (address);
function WETH() external pure returns (address);
}
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isExcludedFromFee;
address public owner;
uint256 private _totalSupply;
string private _name;
string private _symbol;
address private marketing_wl;
uint256 public buy_fee = 15;
uint256 public sell_fee = 25;
uint256 public maxBuySell;
address private constant RouterV2 = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
modifier onlyOwner() {
require(owner == msg.sender, "Ownable: caller is not the owner");
_;
}
function setFees_15_25() public onlyOwner {
buy_fee = 15;
sell_fee = 25;
}
function setFees_10_10() public onlyOwner {
buy_fee = 10;
sell_fee = 10;
}
function setFees_1_1() public onlyOwner {
buy_fee = 1;
sell_fee = 1;
}
function removeFees() public onlyOwner {
buy_fee = 0;
sell_fee = 0;
}
function removeMaxBuySellLimit() public onlyOwner {
maxBuySell = 0;
}
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = owner;
owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function exclude_from_fee(address account) public onlyOwner {
_isExcludedFromFee[account] = true;
}
function include_in_fee(address account) public onlyOwner {
_isExcludedFromFee[account] = false;
}
constructor( address _marketing_wl ) {
_name = "Evolutionet";
_symbol = "Evo";
_totalSupply = 100000000*10**5;
_balances[msg.sender] = _totalSupply;
emit Transfer(address(0), msg.sender, _totalSupply);
maxBuySell = _totalSupply * 2 / 100;
owner = msg.sender;
marketing_wl = _marketing_wl;
_isExcludedFromFee[msg.sender] = true;
_isExcludedFromFee[marketing_wl] = true;
IUniswapV2Factory(IUniswapV2Router(RouterV2).factory())
.createPair(address(this), IUniswapV2Router(RouterV2).WETH());
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 5;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address _owner = _msgSender();
_transfer(_owner, to, amount);
return true;
}
function allowance(address _owner, address spender) public view virtual override returns (uint256) {
return _allowances[_owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address _owner = _msgSender();
_approve(_owner, spender, amount);
return true;
}
function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address _owner = _msgSender();
_approve(_owner, spender, allowance(_owner, spender) + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address _owner = _msgSender();
uint256 currentAllowance = allowance(_owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(_owner, spender, currentAllowance - subtractedValue);
}
return true;
}
function _transfer(address from, address to, uint256 amount) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
if (_isExcludedFromFee[from] || _isExcludedFromFee[to] ) {
_balances[from] = fromBalance - amount;
_balances[to] += amount;
emit Transfer(from, to, amount);
} else {
if (to == getPoolAddress() || from == getPoolAddress()) {
uint256 _this_fee;
if(maxBuySell > 0) require(maxBuySell >= amount, "ERC20: The amount of the transfer is more than allowed");
if(to == getPoolAddress()) _this_fee = sell_fee;
if(from == getPoolAddress()) _this_fee = buy_fee;
uint256 _amount = amount * (100 - _this_fee) / 100;
_balances[from] = fromBalance - amount;
_balances[to] += _amount;
emit Transfer(from, to, _amount);
uint256 _this_fee_value = amount * _this_fee / 100;
_balances[marketing_wl] += _this_fee_value;
} else {
_balances[from] = fromBalance - amount;
_balances[to] += amount;
emit Transfer(from, to, amount);
}
}
}
function getPoolAddress() public view returns (address) {
address poolAddress = IUniswapV2Factory(IUniswapV2Router(RouterV2).factory()).getPair(address(this), IUniswapV2Router(RouterV2).WETH());
return poolAddress;
}
function _approve(address _owner, address spender, uint256 amount) internal virtual {
require(_owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[_owner][spender] = amount;
emit Approval(_owner, spender, amount);
}
function _spendAllowance(address _owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(_owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(_owner, spender, currentAllowance - amount);
}
}
}
}
