Rids Coin

pragma solidity ^0.5.7;

// ----------------------------------------------------------------------------
// 'Sincerity' token contract
//
// Symbol      : XXX
// Name        : XXXname
// Total supply: xxxxxxx
// Decimals    : xx
//
// ----------------------------------------------------------------------------
// Safe maths
// ----------------------------------------------------------------------------
contract SafeMath {
    function safeAdd(uint a, uint b) public pure returns (uint c) {
        c = a + b;
        require(c >= a, "Addition failed");
    }
    function safeSub(uint a, uint b) public pure returns (uint c) {
        require(b <= a, "Subtraction failed");
        c = a - b;
    }
    function safeMul(uint a, uint b) public pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function safeDiv(uint a, uint b) public pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}


contract ERC20Interface {
    function totalSupply() public view returns (uint);
    function balanceOf(address tokenOwner) public view returns (uint balance);
    function allowance(address tokenOwner, address spender) public view returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}


contract ApproveAndCallFallBack {
    function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;
}


// ----------------------------------------------------------------------------
// Owned contract
// ----------------------------------------------------------------------------
contract Owned {
    address public owner;
    address public newOwner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        newOwner = _newOwner;
    }
    function acceptOwnership() public {
        require(msg.sender == newOwner);
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}


// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and assisted
// token transfers
// ----------------------------------------------------------------------------
contract RidsCoin is ERC20Interface, Owned, SafeMath {
    string public symbol;
    string public  name;
    uint public decimals;
    uint public _totalSupply;

    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;
    
    mapping(uint => string) scripts;



    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    constructor(string memory _symbol,string memory _name,
            uint _decimals,uint totalSupply) public {
        symbol = _symbol;
        name = _name;
        decimals = _decimals;
        _totalSupply = totalSupply * 10**decimals;
        balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }
    
     function isContract(address _addr) public view returns(bool){
        uint32 size;
        assembly{
            size := extcodesize(_addr)
        }
        return (size > 0);
    }   

    function totalSupply() public view returns (uint) {
        return _totalSupply  - balances[address(0)];
    }

    function balanceOf(address tokenOwner) public view returns (uint balance) {
        return balances[tokenOwner];
    }

    function transfer(address to, uint tokens) public returns (bool success) {
        
        require(balances[msg.sender] >= tokens, "Sender doesn't have enough tokens");
        require(!isContract(to) && to != address(0), "To address cannot be contract address or zero address");
        
        balances[msg.sender] = safeSub(balances[msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(msg.sender, to, tokens);
        return true;
    }


    function approve(address spender, uint tokens) public returns (bool success) {
        
        require(balances[msg.sender] >= tokens, "Sender doesn't have enough tokens");
        require(!isContract(spender) && spender != address(0), "To address cannot be contract address or zero address");
        
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        return true;
    }


    function transferFrom(address from, address to, uint tokens) public returns (bool success) {
        
        require(balances[from] >= tokens, "From doesn't have enough tokens");
        require(allowed[from][msg.sender] >= tokens, "You are not approved tokens");
        require(!isContract(to) && to != address(0), "To address cannot be contract address or zero address");

        
        balances[from] = safeSub(balances[from], tokens);
        allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
        balances[to] = safeAdd(balances[to], tokens);
        emit Transfer(from, to, tokens);
        return true;
    }


    function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
        return allowed[tokenOwner][spender];
    }


    function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
        return true;
    }
    
    
    function getScript(uint id) public view returns(string memory) {
        return scripts[id];
    }
    
    function setScript(uint id, string memory url) public {
        scripts[id] = url;
    }
   
    
    // ------------------------------------------------------------------------
    // Don't accept ETH
    // ------------------------------------------------------------------------
    function () external payable {
        revert();
    }


    // ------------------------------------------------------------------------
    // Owner can transfer out any accidentally sent ERC20 tokens
    // ------------------------------------------------------------------------
    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }
   
    function destruct() onlyOwner public{
        selfdestruct(msg.sender);
    }
}

{
  "compilationTarget": {
    "RidsCoin.sol": "RidsCoin"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}