/**
*Submitted for verification at Etherscan.io on 2020-10-10
*/
pragma solidity 0.5.17;
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0);
uint256 c = a / b;
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
contract Ownable {
address public owner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner() {
require(msg.sender == owner, "permission denied");
_;
}
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0), "invalid address");
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract ERC20 {
using SafeMath for uint256;
mapping(address => uint256) internal _balances;
mapping(address => mapping(address => uint256)) internal _allowed;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
uint256 internal _totalSupply;
/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the balance of.
* @return A uint256 representing the amount owned by the passed address.
*/
function balanceOf(address owner) public view returns (uint256) {
return _balances[owner];
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param owner address The address which owns the funds.
* @param spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address owner, address spender)
public
view
returns (uint256)
{
return _allowed[owner][spender];
}
/**
* @dev Transfer token to a specified address
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function transfer(address to, uint256 value) public returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
*/
function approve(address spender, uint256 value) public returns (bool) {
_allowed[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
/**
* @dev Transfer tokens from one address to another.
* Note that while this function emits an Approval event, this is not required as per the specification,
* and other compliant implementations may not emit the event.
* @param from address The address which you want to send tokens from
* @param to address The address which you want to transfer to
* @param value uint256 the amount of tokens to be transferred
*/
function transferFrom(
address from,
address to,
uint256 value
) public returns (bool) {
if (from != msg.sender && _allowed[from][msg.sender] != uint256(-1))
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
_transfer(from, to, value);
return true;
}
function _transfer(
address from,
address to,
uint256 value
) internal {
require(to != address(0));
_balances[from] = _balances[from].sub(value);
_balances[to] = _balances[to].add(value);
emit Transfer(from, to, value);
}
}
contract ERC20Mintable is ERC20 {
string public name;
string public symbol;
uint8 public decimals;
function _mint(address to, uint256 amount) internal {
_balances[to] = _balances[to].add(amount);
_totalSupply = _totalSupply.add(amount);
emit Transfer(address(0), to, amount);
}
function _burn(address from, uint256 amount) internal {
_balances[from] = _balances[from].sub(amount);
_totalSupply = _totalSupply.sub(amount);
emit Transfer(from, address(0), amount);
}
}
contract Emoji is ERC20Mintable, Ownable {
using SafeMath for uint256;
mapping(address => bool) public isMinter;
constructor(address _presale_address) public {
name = "Emojis Farm";
symbol = "EMOJI";
decimals = 18;
_mint(_presale_address, 500 * (10 ** 18));
}
function setMinter(address minter, bool flag) external onlyOwner {
isMinter[minter] = flag;
}
function mint(address to, uint256 amount) external {
require(isMinter[msg.sender], "Not Minter");
_mint(to, amount);
}
function burn(address from, uint256 amount) external {
if (from != msg.sender && _allowed[from][msg.sender] != uint256(-1))
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(amount);
require(_balances[from] >= amount, "insufficient-balance");
_burn(from, amount);
}
}
{
"compilationTarget": {
"Emoji.sol": "Emoji"
},
"evmVersion": "istanbul",
"libraries": {},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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