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"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": "", "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, 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"source": "pragma solidity ^0.4.18;\n\nimport \"./BurnableToken.sol\";\nimport \"./StandardToken.sol\";\n\n\n/**\n * @title Standard Burnable Token\n * @dev Adds burnFrom method to ERC20 implementations\n */\ncontract StandardBurnableToken is BurnableToken, StandardToken {\n\n /**\n * @dev Burns a specific amount of tokens from the target address and decrements allowance\n * @param _from address The address which you want to send tokens from\n * @param _value uint256 The amount of token to be burned\n */\n function burnFrom(address _from, uint256 _value) public {\n require(_value <= allowed[_from][msg.sender]);\n // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,\n // this function needs to emit an event with the updated approval.\n allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);\n _burn(_from, _value);\n }\n}\n", "sourcePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/StandardBurnableToken.sol", "ast": { "absolutePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/StandardBurnableToken.sol", "exportedSymbols": { "StandardBurnableToken": [ 2857 ] }, "id": 2858, "nodeType": "SourceUnit", "nodes": [ { "id": 2809, "literals": [ "solidity", "^", "0.4", ".18" ], "nodeType": "PragmaDirective", "src": "0:24:41" }, { "absolutePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/BurnableToken.sol", "file": "./BurnableToken.sol", "id": 2810, "nodeType": "ImportDirective", "scope": 2858, "sourceUnit": 2287, "src": "26:29:41", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/StandardToken.sol", "file": "./StandardToken.sol", "id": 2811, "nodeType": "ImportDirective", "scope": 2858, "sourceUnit": 3104, "src": "56:29:41", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 2812, "name": "BurnableToken", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2286, "src": "218:13:41", "typeDescriptions": { "typeIdentifier": "t_contract$_BurnableToken_$2286", "typeString": "contract BurnableToken" } }, "id": 2813, "nodeType": "InheritanceSpecifier", "src": "218:13:41" }, { "arguments": null, "baseName": { "contractScope": null, "id": 2814, "name": "StandardToken", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3103, "src": "233:13:41", "typeDescriptions": { "typeIdentifier": "t_contract$_StandardToken_$3103", "typeString": "contract StandardToken" } }, "id": 2815, "nodeType": "InheritanceSpecifier", "src": "233:13:41" } ], "contractDependencies": [ 2215, 2286, 2479, 2511, 3103 ], "contractKind": "contract", "documentation": "@title Standard Burnable Token\n@dev Adds burnFrom method to ERC20 implementations", "fullyImplemented": true, "id": 2857, "linearizedBaseContracts": [ 2857, 3103, 2286, 2215, 2479, 2511 ], "name": "StandardBurnableToken", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 2855, "nodeType": "Block", "src": "546:314:41", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2830, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 2823, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2819, "src": "560:6:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<=", "rightExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 2824, "name": "allowed", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2871, "src": "570:7:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 2826, "indexExpression": { "argumentTypes": null, "id": 2825, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "578:5:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "570:14:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2829, "indexExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2827, "name": "msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4784, "src": "585:3:41", "typeDescriptions": { "typeIdentifier": "t_magic_message", "typeString": "msg" } }, "id": 2828, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sender", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "585:10:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "570:26:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "560:36:41", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 2822, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4787, 4788 ], "referencedDeclaration": 4787, "src": "552:7:41", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 2831, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "552:45:41", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2832, "nodeType": "ExpressionStatement", "src": "552:45:41" }, { "expression": { "argumentTypes": null, "id": 2848, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 2833, "name": "allowed", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2871, "src": "762:7:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 2837, "indexExpression": { "argumentTypes": null, "id": 2834, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "770:5:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "762:14:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2838, "indexExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2835, "name": "msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4784, "src": "777:3:41", "typeDescriptions": { "typeIdentifier": "t_magic_message", "typeString": "msg" } }, "id": 2836, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sender", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "777:10:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "762:26:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2846, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2819, "src": "822:6:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 2839, "name": "allowed", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2871, "src": "791:7:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 2841, "indexExpression": { "argumentTypes": null, "id": 2840, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "799:5:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "791:14:41", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2844, "indexExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 2842, "name": "msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4784, "src": "806:3:41", "typeDescriptions": { "typeIdentifier": "t_magic_message", "typeString": "msg" } }, "id": 2843, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sender", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "806:10:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "791:26:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2845, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sub", "nodeType": "MemberAccess", "referencedDeclaration": 511, "src": "791:30:41", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 2847, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "791:38:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "762:67:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2849, "nodeType": "ExpressionStatement", "src": "762:67:41" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 2851, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2817, "src": "841:5:41", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 2852, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2819, "src": "848:6:41", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2850, "name": "_burn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2285, "src": "835:5:41", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 2853, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "835:20:41", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2854, "nodeType": "ExpressionStatement", "src": "835:20:41" } ] }, "documentation": "@dev Burns a specific amount of tokens from the target address and decrements allowance\n@param _from address The address which you want to send tokens from\n@param _value uint256 The amount of token to be burned", "id": 2856, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "burnFrom", "nodeType": "FunctionDefinition", "parameters": { "id": 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"internal" } ], "src": "507:31:41" }, "payable": false, "returnParameters": { "id": 2821, "nodeType": "ParameterList", "parameters": [], "src": "546:0:41" }, "scope": 2857, "src": "490:370:41", "stateMutability": "nonpayable", "superFunction": null, "visibility": "public" } ], "scope": 2858, "src": "184:678:41" } ], "src": "0:863:41" }, "legacyAST": { "absolutePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/StandardBurnableToken.sol", "exportedSymbols": { "StandardBurnableToken": [ 2857 ] }, "id": 2858, "nodeType": "SourceUnit", "nodes": [ { "id": 2809, "literals": [ "solidity", "^", "0.4", ".18" ], "nodeType": "PragmaDirective", "src": "0:24:41" }, { "absolutePath": "/home/spalladino/Projects/openzeppelin-zos/contracts/token/ERC20/BurnableToken.sol", "file": "./BurnableToken.sol", "id": 2810, "nodeType": "ImportDirective", "scope": 2858, "sourceUnit": 2287, "src": "26:29:41", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": 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