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"t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 27610, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27579, "src": "1914:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "id": 27611, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 27486, "src": "1914:13:28", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 27612, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "1914:22:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 27613, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27581, "src": "1938:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 27614, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27583, "src": "1947:5:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 27608, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "1891:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 27609, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "1891:22:28", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 27615, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1891:62:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 27606, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27729, "src": "1864:19:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$27517_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 27616, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1864:90:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 27617, "nodeType": "ExpressionStatement", "src": "1864:90:28" } ] }, "documentation": { "id": 27577, "nodeType": "StructuredDocumentation", "src": "1094:249:28", "text": " @dev Deprecated. This function has issues similar to the ones found in\n {IERC20-approve}, and its usage is discouraged.\n Whenever possible, use {safeIncreaseAllowance} and\n {safeDecreaseAllowance} instead." }, "implemented": true, "kind": "function", "modifiers": [], "name": "safeApprove", "parameters": { "id": 27584, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 27579, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 27619, "src": "1369:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, "typeName": { "id": 27578, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 27517, "src": "1369:6:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 27581, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 27619, "src": "1383:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 27580, "name": "address", "nodeType": "ElementaryTypeName", "src": "1383:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 27583, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 27619, "src": "1400:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 27582, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1400:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1368:46:28" }, "returnParameters": { "id": 27585, "nodeType": "ParameterList", "parameters": [], "src": "1424:0:28" }, "scope": 27730, "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "id": 27655, "nodeType": "FunctionDefinition", "src": "1967:283:28", "body": { "id": 27654, "nodeType": "Block", "src": "2053:197:28", "statements": [ { "assignments": [ 27629 ], "declarations": [ { "constant": false, "id": 27629, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "scope": 27654, "src": "2063:20:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 27628, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2063:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 27641, "initialValue": { "arguments": [ { "id": 27639, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27625, "src": "2130:5:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "arguments": [ { "arguments": [ { "id": 27634, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "2110:4:28", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$27730", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$27730", "typeString": "library SafeERC20" } ], "id": 27633, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2102:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 27632, "name": "address", "nodeType": "ElementaryTypeName", "src": "2102:7:28", "typeDescriptions": {} } }, "id": 27635, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2102:13:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 27636, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27623, "src": "2117:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 27630, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27621, "src": "2086:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "id": 27631, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 27476, "src": "2086:15:28", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 27637, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:39:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 27638, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 26678, "src": "2086:43:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 27640, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:50:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2063:73:28" }, { "expression": { "arguments": [ { "id": 27643, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27621, "src": "2166:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 27646, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27621, "src": "2196:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "id": 27647, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 27486, "src": "2196:13:28", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 27648, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "2196:22:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 27649, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27623, "src": "2220:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 27650, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27629, "src": "2229:12:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 27644, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "2173:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 27645, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "2173:22:28", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 27651, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2173:69:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 27642, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27729, "src": "2146:19:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$27517_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 27652, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2146:97:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 27653, "nodeType": "ExpressionStatement", "src": "2146:97:28" } ] }, "implemented": true, "kind": "function", "modifiers": [], "name": "safeIncreaseAllowance", "parameters": { "id": 27626, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 27621, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 27655, "src": "1998:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, "typeName": { "id": 27620, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 27517, "src": "1998:6:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 27623, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 27655, "src": "2012:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 27622, "name": "address", "nodeType": "ElementaryTypeName", "src": "2012:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 27625, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 27655, "src": "2029:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 27624, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2029:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1997:46:28" }, "returnParameters": { "id": 27627, "nodeType": "ParameterList", "parameters": [], "src": "2053:0:28" }, "scope": 27730, "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "id": 27692, "nodeType": "FunctionDefinition", "src": "2256:328:28", "body": { "id": 27691, "nodeType": "Block", "src": "2342:242:28", "statements": [ { "assignments": [ 27665 ], "declarations": [ { "constant": false, "id": 27665, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "scope": 27691, "src": "2352:20:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 27664, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2352:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 27678, "initialValue": { "arguments": [ { "id": 27675, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27661, "src": "2419:5:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "hexValue": "5361666545524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 27676, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "2426:43:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_2c3af60974a758b7e72e108c9bf0943ecc9e4f2e8af4695da5f52fbf57a63d3a", "typeString": "literal_string \"SafeERC20: decreased allowance below zero\"" }, "value": "SafeERC20: decreased allowance below zero" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_stringliteral_2c3af60974a758b7e72e108c9bf0943ecc9e4f2e8af4695da5f52fbf57a63d3a", "typeString": "literal_string \"SafeERC20: decreased allowance below zero\"" } ], "expression": { "arguments": [ { "arguments": [ { "id": 27670, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "2399:4:28", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$27730", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$27730", "typeString": "library SafeERC20" } ], "id": 27669, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2391:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 27668, "name": "address", "nodeType": "ElementaryTypeName", "src": "2391:7:28", "typeDescriptions": {} } }, "id": 27671, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2391:13:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 27672, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27659, "src": "2406:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 27666, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27657, "src": "2375:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "id": 27667, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 27476, "src": "2375:15:28", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 27673, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2375:39:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 27674, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "sub", "nodeType": "MemberAccess", "referencedDeclaration": 26802, "src": "2375:43:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$_t_string_memory_ptr_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256,string memory) pure returns (uint256)" } }, "id": 27677, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2375:95:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2352:118:28" }, { "expression": { "arguments": [ { "id": 27680, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27657, "src": "2500:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 27683, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27657, "src": "2530:5:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "id": 27684, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 27486, "src": "2530:13:28", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 27685, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "2530:22:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 27686, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27659, "src": "2554:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 27687, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27665, "src": "2563:12:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 27681, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "2507:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 27682, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "2507:22:28", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 27688, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2507:69:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 27679, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27729, "src": "2480:19:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$27517_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 27689, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2480:97:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 27690, "nodeType": "ExpressionStatement", "src": "2480:97:28" } ] }, "implemented": true, "kind": "function", "modifiers": [], "name": "safeDecreaseAllowance", "parameters": { "id": 27662, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 27657, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 27692, "src": "2287:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, "typeName": { "id": 27656, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 27517, "src": "2287:6:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 27659, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 27692, "src": "2301:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 27658, "name": "address", "nodeType": "ElementaryTypeName", "src": "2301:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 27661, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 27692, "src": "2318:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 27660, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2318:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "2286:46:28" }, "returnParameters": { "id": 27663, "nodeType": "ParameterList", "parameters": [], "src": "2342:0:28" }, "scope": 27730, "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "id": 27729, "nodeType": "FunctionDefinition", "src": "2967:751:28", "body": { "id": 27728, "nodeType": "Block", "src": "3037:681:28", "statements": [ { "assignments": [ 27701 ], "declarations": 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"isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "3412:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 27702, "name": "address", "nodeType": "ElementaryTypeName", "src": "3412:7:28", "typeDescriptions": {} } }, "id": 27705, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3412:14:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 27706, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "functionCall", "nodeType": "MemberAccess", "referencedDeclaration": 27821, "src": "3412:27:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$bound_to$_t_address_$", "typeString": "function (address,bytes memory,string memory) returns (bytes memory)" } }, "id": 27709, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3412:69:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "3386:95:28" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 27714, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "expression": { "id": 27711, "name": "returndata", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 27701, "src": "3495:10:28", "typeDescriptions": { "typeIdentifier": 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"t_type$_t_bool_$", "typeString": "type(bool)" } ], "expression": { "id": 27716, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "3624:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 27717, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "decode", "nodeType": "MemberAccess", "src": "3624:10:28", "typeDescriptions": { "typeIdentifier": "t_function_abidecode_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 27722, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3624:30:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "5361666545524332303a204552433230206f7065726174696f6e20646964206e6f742073756363656564", "id": 27723, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "3656:44:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_e11ad79d1e4a7f2e5f376964cb99e8e8f7904e3fc16a109f7a7ecb9aa7956dcd", "typeString": "literal_string \"SafeERC20: ERC20 operation did not succeed\"" }, "value": "SafeERC20: ERC20 operation did not succeed" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_e11ad79d1e4a7f2e5f376964cb99e8e8f7904e3fc16a109f7a7ecb9aa7956dcd", "typeString": "literal_string \"SafeERC20: ERC20 operation did not succeed\"" } ], "id": 27715, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "3616:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 27724, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3616:85:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 27725, "nodeType": "ExpressionStatement", "src": "3616:85:28" } ] } } ] }, "documentation": { "id": 27693, "nodeType": "StructuredDocumentation", "src": "2590:372:28", "text": " @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n on the return value: the return value is optional (but if data is returned, it must not be false).\n @param token The token targeted by the call.\n @param data The call data (encoded using abi.encode or one of its variants)." }, "implemented": true, "kind": "function", "modifiers": [], "name": "_callOptionalReturn", "parameters": { "id": 27698, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 27695, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 27729, "src": "2996:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" }, "typeName": { "id": 27694, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 27517, "src": "2996:6:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$27517", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 27697, "mutability": "mutable", "name": "data", "nodeType": "VariableDeclaration", "scope": 27729, "src": "3010:17:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 27696, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "3010:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "visibility": "internal" } ], "src": "2995:33:28" }, "returnParameters": { "id": 27699, "nodeType": "ParameterList", "parameters": [], "src": "3037:0:28" }, "scope": 27730, "stateMutability": "nonpayable", "virtual": false, "visibility": "private" } ], "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 27523, "nodeType": "StructuredDocumentation", "src": "158:457:28", "text": " @title SafeERC20\n @dev Wrappers around ERC20 operations that throw on failure (when the token\n contract returns false). Tokens that return no value (and instead revert or\n throw on failure) are also supported, non-reverting calls are assumed to be\n successful.\n To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n which allows you to call the safe operations as `token.safeTransfer(...)`, etc." }, "fullyImplemented": true, "linearizedBaseContracts": [ 27730 ], "name": "SafeERC20", "scope": 27731 } ], "license": "MIT" }, "id": 28 }