{
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  "source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\npragma solidity 0.6.12;\nimport \"../utility/Utils.sol\";\nimport \"../utility/SafeMath.sol\";\n\n/**\n  * ERC20 Non-Standard Token implementation\n*/\ncontract NonStandardToken is Utils {\n    using SafeMath for uint256;\n\n    uint256 public totalSupply;\n    mapping (address => uint256) public balanceOf;\n    mapping (address => mapping (address => uint256)) public allowance;\n\n    event Transfer(address indexed _from, address indexed _to, uint256 _value);\n    event Approval(address indexed _owner, address indexed _spender, uint256 _value);\n\n    /**\n      * @dev initializes a new NonStandardToken instance\n      *\n      * @param _supply      initial supply\n    */\n    constructor(uint256 _supply)\n        internal\n    {\n        totalSupply = _supply;\n        balanceOf[msg.sender] = _supply;\n    }\n\n    /**\n      * @dev send coins\n      * throws on any error rather then return a false flag to minimize user errors\n      *\n      * @param _to      target address\n      * @param _value   transfer amount\n    */\n    function _transfer(address _to, uint256 _value)\n        internal\n        validAddress(_to)\n    {\n        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);\n        balanceOf[_to] = balanceOf[_to].add(_value);\n        emit Transfer(msg.sender, _to, _value);\n    }\n\n    /**\n      * @dev an account/contract attempts to get the coins\n      * throws on any error rather then return a false flag to minimize user errors\n      *\n      * @param _from    source address\n      * @param _to      target address\n      * @param _value   transfer amount\n    */\n    function _transferFrom(address _from, address _to, uint256 _value)\n        internal\n        validAddress(_from)\n        validAddress(_to)\n    {\n        allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);\n        balanceOf[_from] = balanceOf[_from].sub(_value);\n        balanceOf[_to] = balanceOf[_to].add(_value);\n        emit Transfer(_from, _to, _value);\n    }\n\n    /**\n      * @dev allow another account/contract to spend some tokens on your behalf\n      * throws on any error rather then return a false flag to minimize user errors\n      *\n      * also, to minimize the risk of the approve/transferFrom attack vector\n      * (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice\n      * in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value\n      *\n      * @param _spender approved address\n      * @param _value   allowance amount\n    */\n    function _approve(address _spender, uint256 _value)\n        internal\n        validAddress(_spender)\n    {\n        // if the allowance isn't 0, it can only be updated to 0 to prevent an allowance change immediately after withdrawal\n        require(_value == 0 || allowance[msg.sender][_spender] == 0);\n\n        allowance[msg.sender][_spender] = _value;\n        emit Approval(msg.sender, _spender, _value);\n    }\n}\n\ncontract NonStandardTokenDetailed is NonStandardToken {\n    string public name;\n    string public symbol;\n    uint8 public decimals;\n\n    /**\n      * @dev initializes a new NonStandardToken instance\n      *\n      * @param _name        token name\n      * @param _symbol      token symbol\n      * @param _decimals    decimal points\n      * @param _supply      initial supply\n    */\n    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _supply)\n        internal\n        NonStandardToken(_supply)\n    {\n        name = _name;\n        symbol = _symbol;\n        decimals = _decimals;\n    }\n}\n\ncontract TestNonStandardToken is NonStandardTokenDetailed {\n    bool public ok;\n\n    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _supply) public\n        NonStandardTokenDetailed(_name, _symbol, _decimals, _supply) {\n        set(true);\n    }\n\n    function set(bool _ok) public {\n        ok = _ok;\n    }\n\n    function approve(address _spender, uint256 _value) public {\n        _approve(_spender, _value);\n        require(ok);\n    }\n\n    function transfer(address _to, uint256 _value) public {\n        _transfer(_to, _value);\n        require(ok);\n    }\n\n    function transferFrom(address _from, address _to, uint256 _value) public {\n        _transferFrom(_from, _to, _value);\n        require(ok);\n    }\n}\n\ncontract TestNonStandardTokenWithoutDecimals is NonStandardToken {\n    string public name;\n    string public symbol;\n\n    constructor(string memory _name, string memory _symbol, uint256 _supply) public\n        NonStandardToken(_supply) {\n        name = _name;\n        symbol = _symbol;\n    }\n\n    function approve(address _spender, uint256 _value) public {\n        _approve(_spender, _value);\n    }\n\n    function transfer(address _to, uint256 _value) public {\n        _transfer(_to, _value);\n    }\n\n    function transferFrom(address _from, address _to, uint256 _value) public {\n        _transferFrom(_from, _to, _value);\n    }\n}\n\ncontract TestStandardToken is NonStandardTokenDetailed {\n    bool public ok;\n    bool public ret;\n\n    constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _supply) public\n        NonStandardTokenDetailed(_name, _symbol, _decimals, _supply) {\n        set(true, true);\n    }\n\n    function set(bool _ok, bool _ret) public {\n        ok = _ok;\n        ret = _ret;\n    }\n\n    function approve(address _spender, uint256 _value) public returns (bool) {\n        _approve(_spender, _value);\n        require(ok);\n        return ret;\n    }\n\n    function transfer(address _to, uint256 _value) public returns (bool) {\n        _transfer(_to, _value);\n        require(ok);\n        return ret;\n    }\n\n    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {\n        _transferFrom(_from, _to, _value);\n        require(ok);\n        return ret;\n    }\n}\n",
  "sourcePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/helpers/TestTokens.sol",
  "ast": {
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      "TestNonStandardTokenWithoutDecimals": [
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      "TestStandardToken": [
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      },
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              "text": " @dev allow another account/contract to spend some tokens on your behalf\n throws on any error rather then return a false flag to minimize user errors\n also, to minimize the risk of the approve/transferFrom attack vector\n (see https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/), approve has to be called twice\n in 2 separate transactions - once to change the allowance to 0 and secondly to change it to the new allowance value\n @param _spender approved address\n @param _value   allowance amount"
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