{ "contractName": "StandardToken", "abi": [ { "constant": false, "inputs": [ { "name": "_spender", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "approve", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_from", "type": "address" }, { "name": "_to", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_spender", "type": "address" }, { "name": "_subtractedValue", "type": "uint256" } ], "name": "decreaseApproval", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "_owner", "type": "address" } ], "name": "balanceOf", "outputs": [ { "name": "balance", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "_to", "type": "address" }, { "name": "_value", "type": "uint256" } ], "name": "transfer", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_spender", "type": "address" }, { "name": "_addedValue", "type": "uint256" } ], "name": "increaseApproval", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "_owner", "type": "address" }, { "name": "_spender", "type": "address" } ], "name": "allowance", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "owner", "type": "address" }, { "indexed": true, "name": "spender", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "from", "type": "address" }, { "indexed": true, "name": "to", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" } ], "bytecode": 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"source": "pragma solidity ^0.4.18;\n\n\nimport './BasicToken.sol';\nimport './ERC20.sol';\n\n\n/**\n * @title Standard ERC20 token\n *\n * @dev Implementation of the basic standard token.\n * @dev https://github.com/ethereum/EIPs/issues/20\n * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol\n */\ncontract StandardToken is ERC20, BasicToken {\n\n mapping (address => mapping (address => uint256)) internal allowed;\n\n\n /**\n * @dev Transfer tokens from one address to another\n * @param _from address The address which you want to send tokens from\n * @param _to address The address which you want to transfer to\n * @param _value uint256 the amount of tokens to be transferred\n */\n function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {\n require(_to != address(0));\n require(_value <= balances[_from]);\n require(_value <= allowed[_from][msg.sender]);\n\n balances[_from] = balances[_from].sub(_value);\n balances[_to] = balances[_to].add(_value);\n allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);\n Transfer(_from, _to, _value);\n return true;\n }\n\n /**\n * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n *\n * Beware that changing an allowance with this method brings the risk that someone may use both the old\n * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n * @param _spender The address which will spend the funds.\n * @param _value The amount of tokens to be spent.\n */\n function approve(address _spender, uint256 _value) public returns (bool) {\n allowed[msg.sender][_spender] = _value;\n Approval(msg.sender, _spender, _value);\n return true;\n }\n\n /**\n * @dev Function to check the amount of tokens that an owner allowed to a spender.\n * @param _owner address The address which owns the funds.\n * @param _spender address The address which will spend the funds.\n * @return A uint256 specifying the amount of tokens still available for the spender.\n */\n function allowance(address _owner, address _spender) public view returns (uint256) {\n return allowed[_owner][_spender];\n }\n\n /**\n * @dev Increase the amount of tokens that an owner allowed to a spender.\n *\n * approve should be called when allowed[_spender] == 0. To increment\n * allowed value is better to use this function to avoid 2 calls (and wait until\n * the first transaction is mined)\n * From MonolithDAO Token.sol\n * @param _spender The address which will spend the funds.\n * @param _addedValue The amount of tokens to increase the allowance by.\n */\n function increaseApproval(address _spender, uint _addedValue) public returns (bool) {\n allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);\n Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n return true;\n }\n\n /**\n * @dev Decrease the amount of tokens that an owner allowed to a spender.\n *\n * approve should be called when allowed[_spender] == 0. To decrement\n * allowed value is better to use this function to avoid 2 calls (and wait until\n * the first transaction is mined)\n * From MonolithDAO Token.sol\n * @param _spender The address which will spend the funds.\n * @param _subtractedValue The amount of tokens to decrease the allowance by.\n */\n function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {\n uint oldValue = allowed[msg.sender][_spender];\n if (_subtractedValue > oldValue) {\n allowed[msg.sender][_spender] = 0;\n } else {\n allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);\n }\n Approval(msg.sender, _spender, allowed[msg.sender][_spender]);\n return true;\n }\n\n}\n", "sourcePath": "zeppelin-solidity/contracts/token/StandardToken.sol", "ast": { "attributes": { "absolutePath": "zeppelin-solidity/contracts/token/StandardToken.sol", "exportedSymbols": { "StandardToken": [ 11999 ] } }, "children": [ { "attributes": { "literals": [ "solidity", "^", "0.4", ".18" ] }, "id": 11755, "name": "PragmaDirective", "src": "0:24:41" }, { "attributes": { "SourceUnit": 11532, "absolutePath": "zeppelin-solidity/contracts/token/BasicToken.sol", "file": "./BasicToken.sol", "scope": 12000, "symbolAliases": [ null ], "unitAlias": "" }, "id": 11756, "name": "ImportDirective", "src": "27:26:41" }, { "attributes": { "SourceUnit": 11630, "absolutePath": "zeppelin-solidity/contracts/token/ERC20.sol", "file": "./ERC20.sol", "scope": 12000, "symbolAliases": [ null ], "unitAlias": "" }, "id": 11757, "name": "ImportDirective", "src": "54:21:41" }, { "attributes": { "contractDependencies": [ 11531, 11629, 11658 ], "contractKind": "contract", "documentation": "@title Standard ERC20 token\n * @dev Implementation of the basic standard token.\n@dev https://github.com/ethereum/EIPs/issues/20\n@dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol", "fullyImplemented": true, "linearizedBaseContracts": [ 11999, 11531, 11629, 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