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"source": "pragma solidity ^0.4.23;\n\n\nimport \"../ownership/Ownable.sol\";\n\n\n/**\n * @title Pausable\n * @dev Base contract which allows children to implement an emergency stop mechanism.\n */\ncontract Pausable is Ownable {\n event Pause();\n event Unpause();\n\n bool public paused = false;\n\n\n /**\n * @dev Modifier to make a function callable only when the contract is not paused.\n */\n modifier whenNotPaused() {\n require(!paused);\n _;\n }\n\n /**\n * @dev Modifier to make a function callable only when the contract is paused.\n */\n modifier whenPaused() {\n require(paused);\n _;\n }\n\n /**\n * @dev called by the owner to pause, triggers stopped state\n */\n function pause() onlyOwner whenNotPaused public {\n paused = true;\n emit Pause();\n }\n\n /**\n * @dev called by the owner to unpause, returns to normal state\n */\n function unpause() onlyOwner whenPaused public {\n paused = false;\n emit Unpause();\n }\n}\n", "sourcePath": "openzeppelin-solidity/contracts/lifecycle/Pausable.sol", "ast": { "absolutePath": "openzeppelin-solidity/contracts/lifecycle/Pausable.sol", "exportedSymbols": { "Pausable": [ 4187 ] }, "id": 4188, "nodeType": "SourceUnit", "nodes": [ { "id": 4129, "literals": [ "solidity", "^", "0.4", ".23" ], "nodeType": "PragmaDirective", "src": "0:24:28" }, { "absolutePath": "openzeppelin-solidity/contracts/ownership/Ownable.sol", "file": "../ownership/Ownable.sol", "id": 4130, "nodeType": "ImportDirective", "scope": 4188, "sourceUnit": 4368, "src": "27:34:28", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 4131, "name": "Ownable", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4367, "src": "198:7:28", "typeDescriptions": { "typeIdentifier": "t_contract$_Ownable_$4367", "typeString": "contract Ownable" } }, "id": 4132, "nodeType": "InheritanceSpecifier", "src": "198:7:28" } ], "contractDependencies": [ 4367 ], "contractKind": "contract", "documentation": "@title Pausable\n@dev Base contract which allows children to implement an emergency stop mechanism.", "fullyImplemented": true, "id": 4187, "linearizedBaseContracts": [ 4187, 4367 ], "name": "Pausable", "nodeType": "ContractDefinition", "nodes": [ { "anonymous": false, "documentation": null, "id": 4134, "name": "Pause", "nodeType": "EventDefinition", "parameters": { "id": 4133, "nodeType": "ParameterList", "parameters": [], "src": "221:2:28" }, "src": "210:14:28" }, { "anonymous": false, "documentation": null, "id": 4136, "name": "Unpause", "nodeType": "EventDefinition", "parameters": { "id": 4135, "nodeType": "ParameterList", "parameters": [], "src": "240:2:28" }, "src": "227:16:28" }, { "constant": false, "id": 4139, "name": "paused", "nodeType": "VariableDeclaration", "scope": 4187, "src": "247:26:28", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 4137, "name": "bool", "nodeType": "ElementaryTypeName", "src": "247:4:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": { "argumentTypes": null, "hexValue": "66616c7365", "id": 4138, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "268:5:28", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "false" }, "visibility": "public" }, { "body": { "id": 4147, "nodeType": "Block", "src": "401:34:28", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4143, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "415:7:28", "subExpression": { "argumentTypes": null, "id": 4142, "name": "paused", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4139, "src": "416:6:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 4141, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 6112, 6113 ], "referencedDeclaration": 6112, "src": "407:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 4144, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "407:16:28", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4145, "nodeType": "ExpressionStatement", "src": "407:16:28" }, { "id": 4146, "nodeType": "PlaceholderStatement", "src": "429:1:28" } ] }, "documentation": "@dev Modifier to make a function callable only when the contract is not paused.", "id": 4148, "name": "whenNotPaused", "nodeType": "ModifierDefinition", "parameters": { "id": 4140, "nodeType": "ParameterList", "parameters": [], "src": "398:2:28" }, "src": "376:59:28", "visibility": "internal" }, { "body": { "id": 4155, "nodeType": "Block", "src": "554:33:28", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4151, "name": "paused", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4139, "src": "568:6:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 4150, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 6112, 6113 ], "referencedDeclaration": 6112, "src": "560:7:28", "typeDescriptions": { "typeIdentifier": 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"ModifierInvocation", "src": "683:9:28" }, { "arguments": null, "id": 4161, "modifierName": { "argumentTypes": null, "id": 4160, "name": "whenNotPaused", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4148, "src": "693:13:28", "typeDescriptions": { "typeIdentifier": "t_modifier$__$", "typeString": "modifier ()" } }, "nodeType": "ModifierInvocation", "src": "693:13:28" } ], "name": "pause", "nodeType": "FunctionDefinition", "parameters": { "id": 4157, "nodeType": "ParameterList", "parameters": [], "src": "680:2:28" }, "payable": false, "returnParameters": { "id": 4162, "nodeType": "ParameterList", "parameters": [], "src": "714:0:28" }, "scope": 4187, "src": "666:90:28", "stateMutability": "nonpayable", "superFunction": null, "visibility": "public" }, { "body": { "id": 4185, "nodeType": "Block", "src": "885:45:28", "statements": [ { "expression": { "argumentTypes": null, "id": 4180, "isConstant": false, "isLValue": false, "isPure": false, 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