{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.8.0+commit.c7dfd78e\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\",\"kind\":\"dev\",\"methods\":{},\"title\":\"SafeERC20\",\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x027b891937d20ccf213fdb9c31531574256de774bda99d3a70ecef6e1913ed2a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://087318b21c528119f649899f5b5580566dd8d7b0303d4904bd0e8580c3545f14\",\"dweb:/ipfs/Qmbn5Mj7aUn8hJuQ8VrQjjEXRsXyJKykgnjR9p4C3nfLtL\"]},\"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\":{\"keccak256\":\"0x02348b2e4b9f3200c7e3907c5c2661643a6d8520e9f79939fbb9b4005a54894d\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://d41d627f4ef9c6006df8c2d01227d3cf4a6c3359b5704c629d88933272eecadd\",\"dweb:/ipfs/QmYDo7MvMsvuDxuJZ9RC9zFganS3Tm8RYzSmBP5qSmJfuY\"]},\"@openzeppelin/contracts/utils/Address.sol\":{\"keccak256\":\"0x3336baae5cf23e94274d75336e2d412193be508504aee185e61dc7d58cd05c8a\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://39a05eec7083dfa0cc7e0cbfe6cd1bd085a340af1ede93fdff3ad047c5fb3d8e\",\"dweb:/ipfs/QmVApz5fCUq2QC8gKTsNNdCmcedJ3ETHp68zR5N3WUKS4r\"]}},\"version\":1}", "bytecode": "0x60566050600b82828239805160001a6073146043577f4e487b7100000000000000000000000000000000000000000000000000000000600052600060045260246000fd5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220f99ed44e76d9732239334dee16d30908b70445a353cdd9063db662c8feb3dab464736f6c63430008000033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220f99ed44e76d9732239334dee16d30908b70445a353cdd9063db662c8feb3dab464736f6c63430008000033", "immutableReferences": {}, "generatedSources": [], "deployedGeneratedSources": [], "sourceMap": "578:3270:2:-:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "578:3270:2:-:0;;;;;;;;", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\nimport \"../../../utils/Address.sol\";\n\n/**\n * @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.\n */\nlibrary SafeERC20 {\n using Address for address;\n\n function safeTransfer(\n IERC20 token,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n /**\n * @dev Deprecated. This function has issues similar to the ones found in\n * {IERC20-approve}, and its usage is discouraged.\n *\n * Whenever possible, use {safeIncreaseAllowance} and\n * {safeDecreaseAllowance} instead.\n */\n function safeApprove(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n // safeApprove should only be called when setting an initial allowance,\n // or when resetting it to zero. To increase and decrease it, use\n // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n require(\n (value == 0) || (token.allowance(address(this), spender) == 0),\n \"SafeERC20: approve from non-zero to non-zero allowance\"\n );\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n }\n\n function safeIncreaseAllowance(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n uint256 newAllowance = token.allowance(address(this), spender) + value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n function safeDecreaseAllowance(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n unchecked {\n uint256 oldAllowance = token.allowance(address(this), spender);\n require(oldAllowance >= value, \"SafeERC20: decreased allowance below zero\");\n uint256 newAllowance = oldAllowance - value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n }\n\n /**\n * @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).\n */\n function _callOptionalReturn(IERC20 token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n // the target address contains contract code and also asserts for success in the low-level call.\n\n bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n if (returndata.length > 0) {\n // Return data is optional\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n }\n }\n}\n", "sourcePath": "@openzeppelin\\contracts\\token\\ERC20\\utils\\SafeERC20.sol", "ast": { "absolutePath": "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol", "exportedSymbols": { "Address": [ 1807 ], "IERC20": [ 181 ], "SafeERC20": [ 405 ] }, "id": 406, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 183, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:2" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "../IERC20.sol", "id": 184, "nodeType": "ImportDirective", "scope": 406, "sourceUnit": 182, "src": "58:23:2", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../../utils/Address.sol", "id": 185, "nodeType": "ImportDirective", "scope": 406, "sourceUnit": 1808, "src": "82:36:2", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 186, "nodeType": "StructuredDocumentation", "src": "120:457:2", "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, "id": 405, "linearizedBaseContracts": [ 405 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 189, "libraryName": { "id": 187, "name": "Address", "nodeType": "IdentifierPath", "referencedDeclaration": 1807, "src": "608:7:2" }, "nodeType": "UsingForDirective", "src": "602:26:2", "typeName": { "id": 188, "name": "address", "nodeType": "ElementaryTypeName", "src": "620:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "body": { "id": 211, "nodeType": "Block", "src": "736:103:2", "statements": [ { "expression": { "arguments": [ { "id": 200, 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false, "lValueRequested": false, "leftExpression": { "arguments": [ { "arguments": [ { "id": 258, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "1741:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 257, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1733:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 256, "name": "address", "nodeType": "ElementaryTypeName", "src": "1733:7:2", "typeDescriptions": {} } }, "id": 259, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1733:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 260, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 244, "src": "1748:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 254, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1717:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 255, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "1717:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 261, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1717:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "hexValue": "30", "id": 262, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1760:1:2", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1717:44:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 264, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1716:46:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "1700:62:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "5361666545524332303a20617070726f76652066726f6d206e6f6e2d7a65726f20746f206e6f6e2d7a65726f20616c6c6f77616e6365", "id": 266, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1776:56:2", "typeDescriptions": { "typeIdentifier": "t_stringliteral_ef945ddb1bfdc0da870feb4560d868b047642b4ac7f2fb7f8b7c51cb4a411e25", "typeString": "literal_string \"SafeERC20: approve from non-zero to non-zero allowance\"" }, "value": "SafeERC20: approve from non-zero to non-zero allowance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_ef945ddb1bfdc0da870feb4560d868b047642b4ac7f2fb7f8b7c51cb4a411e25", "typeString": "literal_string \"SafeERC20: approve from non-zero to non-zero allowance\"" } ], "id": 249, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "1679:7:2", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 267, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1679:163:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 268, "nodeType": "ExpressionStatement", "src": "1679:163:2" }, { "expression": { "arguments": [ { "id": 270, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1872:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 273, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1902:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 274, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 150, "src": "1902:13:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 275, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "1902:22:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 276, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 244, "src": "1926:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 277, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 246, "src": "1935:5:2", "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": 271, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "1879:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 272, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "1879:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 278, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1879:62:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 269, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "1852:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 279, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1852:90:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 280, "nodeType": "ExpressionStatement", "src": "1852:90:2" } ] }, "documentation": { "id": 239, "nodeType": "StructuredDocumentation", "src": "1092:249:2", "text": " @dev Deprecated. This function has issues similar to the ones found in\n {IERC20-approve}, and its usage is discouraged.\n Whenever possible, use {safeIncreaseAllowance} and\n {safeDecreaseAllowance} instead." }, "id": 282, "implemented": true, "kind": "function", "modifiers": [], "name": "safeApprove", "nodeType": "FunctionDefinition", "parameters": { "id": 247, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 242, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 282, "src": "1376:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 241, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 240, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "1376:6:2" }, "referencedDeclaration": 181, "src": "1376:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 244, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 282, "src": "1398:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 243, "name": "address", "nodeType": "ElementaryTypeName", "src": "1398:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 246, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 282, "src": "1423:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 245, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1423:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1366:76:2" }, "returnParameters": { "id": 248, "nodeType": "ParameterList", "parameters": [], "src": "1452:0:2" }, "scope": 405, "src": "1346:603:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 317, "nodeType": "Block", "src": "2071:194:2", "statements": [ { "assignments": [ 293 ], "declarations": [ { "constant": false, "id": 293, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "scope": 317, "src": "2081:20:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 292, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2081:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 304, "initialValue": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 303, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "arguments": [ { "id": 298, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "2128:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 297, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2120:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 296, "name": "address", "nodeType": "ElementaryTypeName", "src": "2120:7:2", "typeDescriptions": {} } }, "id": 299, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2120:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 300, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 287, "src": "2135:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 294, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2104:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 295, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "2104:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 301, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2104:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "id": 302, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 289, "src": "2146:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2104:47:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2081:70:2" }, { "expression": { "arguments": [ { "id": 306, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2181:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 309, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2211:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 310, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 150, "src": "2211:13:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 311, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "2211:22:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 312, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 287, "src": "2235:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 313, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 293, "src": "2244:12:2", "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": 307, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "2188:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 308, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "2188:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 314, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2188:69:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 305, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "2161:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 315, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2161:97:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 316, "nodeType": "ExpressionStatement", "src": "2161:97:2" } ] }, "id": 318, "implemented": true, "kind": "function", "modifiers": [], "name": "safeIncreaseAllowance", "nodeType": "FunctionDefinition", "parameters": { "id": 290, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 285, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 318, "src": "1995:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 284, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 283, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "1995:6:2" }, "referencedDeclaration": 181, "src": "1995:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 287, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 318, "src": "2017:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 286, "name": "address", "nodeType": "ElementaryTypeName", "src": "2017:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 289, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 318, "src": "2042:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 288, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2042:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1985:76:2" }, "returnParameters": { "id": 291, "nodeType": "ParameterList", "parameters": [], "src": "2071:0:2" }, "scope": 405, "src": "1955:310:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 365, "nodeType": "Block", "src": "2387:370:2", "statements": [ { "id": 364, "nodeType": "UncheckedBlock", "src": "2397:354:2", "statements": [ { "assignments": [ 329 ], "declarations": [ { "constant": false, "id": 329, "mutability": "mutable", "name": "oldAllowance", "nodeType": "VariableDeclaration", "scope": 364, "src": "2421:20:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 328, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2421:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 338, "initialValue": { "arguments": [ { "arguments": [ { "id": 334, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "2468:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 333, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2460:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 332, "name": "address", "nodeType": "ElementaryTypeName", "src": "2460:7:2", "typeDescriptions": {} } }, "id": 335, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2460:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 336, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 323, "src": "2475:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 330, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 321, "src": "2444:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 331, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "2444:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 337, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2444:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2421:62:2" }, { "expression": { "arguments": [ { "commonType": { 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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)." }, "id": 404, "implemented": true, "kind": "function", "modifiers": [], "name": "_callOptionalReturn", "nodeType": "FunctionDefinition", "parameters": { "id": 373, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 370, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 404, "src": "3169:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 369, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 368, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "3169:6:2" }, "referencedDeclaration": 181, "src": "3169:6:2", "typeDescriptions": { "typeIdentifier": 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"Address": [ 1807 ], "IERC20": [ 181 ], "SafeERC20": [ 405 ] }, "id": 406, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 183, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:23:2" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "../IERC20.sol", "id": 184, "nodeType": "ImportDirective", "scope": 406, "sourceUnit": 182, "src": "58:23:2", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../../utils/Address.sol", "id": 185, "nodeType": "ImportDirective", "scope": 406, "sourceUnit": 1808, "src": "82:36:2", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 186, "nodeType": "StructuredDocumentation", "src": "120:457:2", "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, "id": 405, "linearizedBaseContracts": [ 405 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 189, "libraryName": { "id": 187, "name": "Address", "nodeType": "IdentifierPath", "referencedDeclaration": 1807, "src": "608:7:2" }, "nodeType": "UsingForDirective", "src": "602:26:2", "typeName": { "id": 188, "name": "address", "nodeType": "ElementaryTypeName", "src": "620:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "body": { "id": 211, "nodeType": "Block", "src": "736:103:2", "statements": [ { "expression": { "arguments": [ { "id": 200, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 192, "src": "766:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 203, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 192, "src": "796:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 204, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transfer", "nodeType": "MemberAccess", "referencedDeclaration": 130, "src": "796:14:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 205, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "796:23:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 206, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 194, "src": "821:2:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 207, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 196, "src": "825:5:2", "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": 201, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "773:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 202, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "773:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 208, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "773:58:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 199, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "746:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 209, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "746:86:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 210, "nodeType": "ExpressionStatement", "src": "746:86:2" } ] }, "id": 212, "implemented": true, "kind": "function", "modifiers": [], "name": "safeTransfer", "nodeType": "FunctionDefinition", "parameters": { "id": 197, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 192, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 212, "src": "665:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 191, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 190, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "665:6:2" }, "referencedDeclaration": 181, "src": "665:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 194, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 212, "src": "687:10:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 193, "name": "address", "nodeType": "ElementaryTypeName", "src": "687:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 196, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 212, "src": "707:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 195, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "707:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "655:71:2" }, "returnParameters": { "id": 198, "nodeType": "ParameterList", "parameters": [], "src": "736:0:2" }, "scope": 405, "src": "634:205:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 237, "nodeType": "Block", "src": "973:113:2", "statements": [ { "expression": { "arguments": [ { "id": 225, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 215, "src": "1003:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 228, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 215, "src": "1033:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 229, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transferFrom", "nodeType": "MemberAccess", "referencedDeclaration": 162, "src": "1033:18:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,address,uint256) external returns (bool)" } }, "id": 230, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "1033:27:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 231, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 217, "src": "1062:4:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 232, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 219, "src": "1068:2:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 233, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 221, "src": "1072:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 226, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "1010:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 227, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "1010:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 234, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1010:68:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 224, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "983:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 235, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "983:96:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 236, "nodeType": "ExpressionStatement", "src": "983:96:2" } ] }, "id": 238, "implemented": true, "kind": "function", "modifiers": [], "name": "safeTransferFrom", "nodeType": "FunctionDefinition", "parameters": { "id": 222, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 215, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 238, "src": "880:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 214, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 213, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "880:6:2" }, "referencedDeclaration": 181, "src": "880:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 217, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "scope": 238, "src": "902:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 216, "name": "address", "nodeType": "ElementaryTypeName", "src": "902:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 219, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 238, "src": "924:10:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 218, "name": "address", "nodeType": "ElementaryTypeName", "src": "924:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 221, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 238, "src": "944:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 220, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "944:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "870:93:2" }, "returnParameters": { "id": 223, "nodeType": "ParameterList", "parameters": [], "src": "973:0:2" }, "scope": 405, "src": "845:241:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 281, "nodeType": "Block", "src": "1452:497:2", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 265, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "components": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 252, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 250, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 246, "src": "1701:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "hexValue": "30", "id": 251, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1710:1:2", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1701:10:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 253, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1700:12:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "components": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 263, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "arguments": [ { "id": 258, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "1741:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 257, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1733:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 256, "name": "address", "nodeType": "ElementaryTypeName", "src": "1733:7:2", "typeDescriptions": {} } }, "id": 259, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1733:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 260, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 244, "src": "1748:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 254, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1717:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 255, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "1717:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 261, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1717:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "hexValue": "30", "id": 262, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1760:1:2", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1717:44:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 264, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1716:46:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "1700:62:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "5361666545524332303a20617070726f76652066726f6d206e6f6e2d7a65726f20746f206e6f6e2d7a65726f20616c6c6f77616e6365", "id": 266, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1776:56:2", "typeDescriptions": { "typeIdentifier": "t_stringliteral_ef945ddb1bfdc0da870feb4560d868b047642b4ac7f2fb7f8b7c51cb4a411e25", "typeString": "literal_string \"SafeERC20: approve from non-zero to non-zero allowance\"" }, "value": "SafeERC20: approve from non-zero to non-zero allowance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_ef945ddb1bfdc0da870feb4560d868b047642b4ac7f2fb7f8b7c51cb4a411e25", "typeString": "literal_string \"SafeERC20: approve from non-zero to non-zero allowance\"" } ], "id": 249, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "1679:7:2", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 267, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1679:163:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 268, "nodeType": "ExpressionStatement", "src": "1679:163:2" }, { "expression": { "arguments": [ { "id": 270, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1872:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 273, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 242, "src": "1902:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 274, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 150, "src": "1902:13:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 275, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "1902:22:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 276, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 244, "src": "1926:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 277, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 246, "src": "1935:5:2", "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": 271, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "1879:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 272, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "1879:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 278, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1879:62:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 269, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "1852:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 279, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1852:90:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 280, "nodeType": "ExpressionStatement", "src": "1852:90:2" } ] }, "documentation": { "id": 239, "nodeType": "StructuredDocumentation", "src": "1092:249:2", "text": " @dev Deprecated. This function has issues similar to the ones found in\n {IERC20-approve}, and its usage is discouraged.\n Whenever possible, use {safeIncreaseAllowance} and\n {safeDecreaseAllowance} instead." }, "id": 282, "implemented": true, "kind": "function", "modifiers": [], "name": "safeApprove", "nodeType": "FunctionDefinition", "parameters": { "id": 247, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 242, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 282, "src": "1376:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 241, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 240, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "1376:6:2" }, "referencedDeclaration": 181, "src": "1376:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 244, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 282, "src": "1398:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 243, "name": "address", "nodeType": "ElementaryTypeName", "src": "1398:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 246, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 282, "src": "1423:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 245, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1423:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1366:76:2" }, "returnParameters": { "id": 248, "nodeType": "ParameterList", "parameters": [], "src": "1452:0:2" }, "scope": 405, "src": "1346:603:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 317, "nodeType": "Block", "src": "2071:194:2", "statements": [ { "assignments": [ 293 ], "declarations": [ { "constant": false, "id": 293, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "scope": 317, "src": "2081:20:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 292, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2081:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 304, "initialValue": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 303, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "arguments": [ { "id": 298, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "2128:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 297, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2120:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 296, "name": "address", "nodeType": "ElementaryTypeName", "src": "2120:7:2", "typeDescriptions": {} } }, "id": 299, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2120:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 300, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 287, "src": "2135:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 294, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2104:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 295, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "2104:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 301, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2104:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "id": 302, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 289, "src": "2146:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2104:47:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2081:70:2" }, { "expression": { "arguments": [ { "id": 306, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2181:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 309, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 285, "src": "2211:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 310, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 150, "src": "2211:13:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 311, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "2211:22:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 312, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 287, "src": "2235:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 313, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 293, "src": "2244:12:2", "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": 307, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "2188:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 308, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "2188:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 314, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2188:69:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 305, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "2161:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 315, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2161:97:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 316, "nodeType": "ExpressionStatement", "src": "2161:97:2" } ] }, "id": 318, "implemented": true, "kind": "function", "modifiers": [], "name": "safeIncreaseAllowance", "nodeType": "FunctionDefinition", "parameters": { "id": 290, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 285, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "scope": 318, "src": "1995:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, "typeName": { "id": 284, "nodeType": "UserDefinedTypeName", "pathNode": { "id": 283, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 181, "src": "1995:6:2" }, "referencedDeclaration": 181, "src": "1995:6:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "visibility": "internal" }, { "constant": false, "id": 287, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 318, "src": "2017:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 286, "name": "address", "nodeType": "ElementaryTypeName", "src": "2017:7:2", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 289, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "scope": 318, "src": "2042:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 288, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2042:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "1985:76:2" }, "returnParameters": { "id": 291, "nodeType": "ParameterList", "parameters": [], "src": "2071:0:2" }, "scope": 405, "src": "1955:310:2", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 365, "nodeType": "Block", "src": "2387:370:2", "statements": [ { "id": 364, "nodeType": "UncheckedBlock", "src": "2397:354:2", "statements": [ { "assignments": [ 329 ], "declarations": [ { "constant": false, "id": 329, "mutability": "mutable", "name": "oldAllowance", "nodeType": "VariableDeclaration", "scope": 364, "src": "2421:20:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 328, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2421:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 338, "initialValue": { "arguments": [ { "arguments": [ { "id": 334, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967268, "src": "2468:4:2", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$405", "typeString": "library SafeERC20" } ], "id": 333, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2460:7:2", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 332, "name": "address", "nodeType": "ElementaryTypeName", "src": "2460:7:2", "typeDescriptions": {} } }, "id": 335, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2460:13:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 336, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 323, "src": "2475:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 330, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 321, "src": "2444:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 331, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 140, "src": "2444:15:2", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 337, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2444:39:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2421:62:2" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 342, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 340, "name": "oldAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 329, "src": "2505:12:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 341, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 325, "src": "2521:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2505:21:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "5361666545524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 343, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "2528:43:2", "typeDescriptions": { "typeIdentifier": "t_stringliteral_2c3af60974a758b7e72e108c9bf0943ecc9e4f2e8af4695da5f52fbf57a63d3a", "typeString": "literal_string \"SafeERC20: decreased allowance below zero\"" }, "value": "SafeERC20: decreased allowance below zero" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_2c3af60974a758b7e72e108c9bf0943ecc9e4f2e8af4695da5f52fbf57a63d3a", "typeString": "literal_string \"SafeERC20: decreased allowance below zero\"" } ], "id": 339, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "2497:7:2", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 344, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2497:75:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 345, "nodeType": "ExpressionStatement", "src": "2497:75:2" }, { "assignments": [ 347 ], "declarations": [ { "constant": false, "id": 347, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "scope": 364, "src": "2586:20:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 346, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2586:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 351, "initialValue": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 350, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 348, "name": "oldAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 329, "src": "2609:12:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 349, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 325, "src": "2624:5:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "2609:20:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2586:43:2" }, { "expression": { "arguments": [ { "id": 353, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 321, "src": "2663:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, { "arguments": [ { "expression": { "expression": { "id": 356, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 321, "src": "2693:5:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" } }, "id": 357, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 150, "src": "2693:13:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 358, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "2693:22:2", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "id": 359, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 323, "src": "2717:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 360, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 347, "src": "2726:12:2", "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": 354, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "2670:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 355, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "2670:22:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 361, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2670:69:2", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$181", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 352, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 404, "src": "2643:19:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$181_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 362, 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"schemaVersion": "3.4.3", "updatedAt": "2021-11-27T07:41:30.851Z", "devdoc": { "details": "Wrappers around ERC20 operations that throw on failure (when the token contract returns false). Tokens that return no value (and instead revert or throw on failure) are also supported, non-reverting calls are assumed to be successful. To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, which allows you to call the safe operations as `token.safeTransfer(...)`, etc.", "kind": "dev", "methods": {}, "title": "SafeERC20", "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }