{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"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/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/math/SafeMath.sol\":{\"keccak256\":\"0x3b21f2c8d626de3b9925ae33e972d8bf5c8b1bffb3f4ee94daeed7d0679036e6\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://7f8d45329fecbf0836ad7543330c3ecd0f8d0ffa42d4016278c3eb2215fdcdfe\",\"dweb:/ipfs/QmXWLT7GcnHtA5NiD6MFi2CV3EWJY4wv5mLNnypqYDrxL3\"]},\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x5f02220344881ce43204ae4a6281145a67bc52c2bb1290a791857df3d19d78f5\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://24427744bd3e6cb73c17010119af12a318289c0253a4d9acb8576c9fb3797b08\",\"dweb:/ipfs/QmTLDqpKRBuxGxRAmjgXt9AkXyACW3MtKzi7PYjm5iMfGC\"]},\"@openzeppelin/contracts/token/ERC20/SafeERC20.sol\":{\"keccak256\":\"0xf12dfbe97e6276980b83d2830bb0eb75e0cf4f3e626c2471137f82158ae6a0fc\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://b3a849c2d95e85463909e5b5c920b13e7a11216ca14127085e16d22b9379d52a\",\"dweb:/ipfs/QmUg3CZDbCCcQdroEpexBy5ZFd5vD1UWijWQq9qHZjtJNQ\"]},\"@openzeppelin/contracts/utils/Address.sol\":{\"keccak256\":\"0xa6a15ddddcbf29d2922a1e0d4151b5d2d33da24b93cc9ebc12390e0d855532f8\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://7c119bcaecfa853d564ac88d312777f75fa1126a3bca88a3371adb0ad9f35cb0\",\"dweb:/ipfs/QmY9UPuXeSKq86Zh38fE43VGQPhKMN34mkuFSFqPcr6nvZ\"]}},\"version\":1}", "bytecode": "0x60566023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220af0f70a6f9dc6780bb39e04cfc8785fdc4e20cce9848155cc99ac43b20705e1464736f6c634300060c0033", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea2646970667358221220af0f70a6f9dc6780bb39e04cfc8785fdc4e20cce9848155cc99ac43b20705e1464736f6c634300060c0033", "immutableReferences": {}, "sourceMap": "616:3104:15:-:0;;;;;;;;;;;;;;;;;;;;;;;;;", "deployedSourceMap": "616:3104:15:-:0;;;;;;;;", "source": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"./IERC20.sol\";\nimport \"../../math/SafeMath.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 SafeMath for uint256;\n using Address for address;\n\n function safeTransfer(IERC20 token, address to, uint256 value) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(IERC20 token, address from, address to, uint256 value) 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(IERC20 token, address spender, uint256 value) 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 // solhint-disable-next-line max-line-length\n require((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(IERC20 token, address spender, uint256 value) internal {\n uint256 newAllowance = token.allowance(address(this), spender).add(value);\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\n uint256 newAllowance = token.allowance(address(this), spender).sub(value, \"SafeERC20: decreased allowance below zero\");\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\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) { // Return data is optional\n // solhint-disable-next-line max-line-length\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n }\n }\n}\n", "sourcePath": "@openzeppelin/contracts/token/ERC20/SafeERC20.sol", "ast": { "absolutePath": "@openzeppelin/contracts/token/ERC20/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 3546 ] }, "id": 3547, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 3335, "literals": [ "solidity", ">=", "0.6", ".0", "<", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:31:15" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 3336, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 3334, "src": "66:22:15", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 3337, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 2753, "src": "89:33:15", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 3338, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 3791, "src": "123:33:15", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 3339, "nodeType": "StructuredDocumentation", "src": "158:457:15", "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": 3546, "linearizedBaseContracts": [ 3546 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 3342, "libraryName": { "contractScope": null, "id": 3340, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2752, "src": "646:8:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2752", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "640:27:15", "typeName": { "id": 3341, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "659:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 3345, 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"typeIdentifier": "t_bool", "typeString": "bool" }, "id": 3418, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3405, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3403, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3399, "src": "1713:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3404, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1722:1:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1713:10:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 3406, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1712:12:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3416, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3411, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "1753:4:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } ], "id": 3410, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "1745:7:15", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3409, "name": "address", "nodeType": "ElementaryTypeName", "src": "1745:7:15", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3412, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1745:13:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3413, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3397, "src": "1760:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3407, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3395, "src": "1729:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3408, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 3292, "src": "1729:15:15", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 3414, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1729:39:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3415, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1772:1:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1729:44:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 3417, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1728:46:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "1712:62:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "5361666545524332303a20617070726f76652066726f6d206e6f6e2d7a65726f20746f206e6f6e2d7a65726f20616c6c6f77616e6365", "id": 3419, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1788:56:15", "subdenomination": null, "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": 3402, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "1704:7:15", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3420, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1704:150:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3421, "nodeType": "ExpressionStatement", "src": "1704:150:15" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3423, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3395, "src": "1884:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3426, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3395, "src": "1914:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3427, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 3302, "src": "1914:13:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 3428, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1914:22:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3429, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3397, "src": "1938:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3430, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3399, "src": "1947:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3424, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "1891:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3425, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1891:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3431, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1891:62:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3422, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3545, "src": "1864:19:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$3333_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 3432, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1864:90:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3433, "nodeType": "ExpressionStatement", "src": "1864:90:15" } ] }, "documentation": { "id": 3393, "nodeType": "StructuredDocumentation", "src": "1094:249:15", "text": " @dev Deprecated. This function has issues similar to the ones found in\n {IERC20-approve}, and its usage is discouraged.\n Whenever possible, use {safeIncreaseAllowance} and\n {safeDecreaseAllowance} instead." }, "id": 3435, "implemented": true, "kind": "function", "modifiers": [], "name": "safeApprove", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3400, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3395, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1369:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3394, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "1369:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3397, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1383:15:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3396, "name": "address", "nodeType": "ElementaryTypeName", "src": "1383:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3399, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1400:13:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3398, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1400:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1368:46:15" }, "returnParameters": { "id": 3401, "nodeType": "ParameterList", "parameters": [], "src": "1424:0:15" }, "scope": 3546, "src": "1348:613:15", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 3470, "nodeType": "Block", "src": "2053:197:15", "statements": [ { "assignments": [ 3445 ], "declarations": [ { "constant": false, "id": 3445, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3470, "src": "2063:20:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3444, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2063:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3457, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3455, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3441, "src": "2130:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3450, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "2110:4:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } ], "id": 3449, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2102:7:15", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3448, "name": "address", "nodeType": "ElementaryTypeName", "src": "2102:7:15", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3451, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2102:13:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3452, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3439, "src": "2117:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3446, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2086:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3447, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 3292, "src": "2086:15:15", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 3453, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:39:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3454, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 2585, "src": "2086:43:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 3456, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:50:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2063:73:15" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3459, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2166:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3462, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2196:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3463, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 3302, "src": "2196:13:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 3464, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2196:22:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3465, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3439, "src": "2220:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3466, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3445, "src": "2229:12:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3460, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "2173:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3461, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2173:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3467, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2173:69:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3458, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3545, "src": "2146:19:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$3333_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 3468, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2146:97:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3469, "nodeType": "ExpressionStatement", "src": "2146:97:15" } ] }, "documentation": null, "id": 3471, "implemented": true, "kind": "function", "modifiers": [], "name": "safeIncreaseAllowance", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3442, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3437, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "1998:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3436, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "1998:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3439, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "2012:15:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3438, "name": "address", "nodeType": "ElementaryTypeName", "src": "2012:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3441, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "2029:13:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3440, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2029:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1997:46:15" }, "returnParameters": { "id": 3443, "nodeType": "ParameterList", "parameters": [], "src": "2053:0:15" }, "scope": 3546, "src": "1967:283:15", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 3507, "nodeType": "Block", "src": 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"ElementaryTypeName", "src": "3010:5:15", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "2995:33:15" }, "returnParameters": { "id": 3515, "nodeType": "ParameterList", "parameters": [], "src": "3037:0:15" }, "scope": 3546, "src": "2967:751:15", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" } ], "scope": 3547, "src": "616:3104:15" } ], "src": "33:3688:15" }, "legacyAST": { "absolutePath": "@openzeppelin/contracts/token/ERC20/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 3546 ] }, "id": 3547, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 3335, "literals": [ "solidity", ">=", "0.6", ".0", "<", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:31:15" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 3336, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 3334, "src": "66:22:15", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 3337, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 2753, "src": "89:33:15", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 3338, "nodeType": "ImportDirective", "scope": 3547, "sourceUnit": 3791, "src": "123:33:15", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": { "id": 3339, "nodeType": "StructuredDocumentation", "src": "158:457:15", "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": 3546, "linearizedBaseContracts": [ 3546 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "id": 3342, "libraryName": { "contractScope": null, "id": 3340, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 2752, "src": "646:8:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$2752", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "640:27:15", "typeName": { "id": 3341, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "659:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 3345, "libraryName": { "contractScope": null, "id": 3343, "name": "Address", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3790, "src": "678:7:15", "typeDescriptions": { "typeIdentifier": "t_contract$_Address_$3790", "typeString": "library Address" } }, "nodeType": "UsingForDirective", "src": "672:26:15", "typeName": { "id": 3344, "name": "address", "nodeType": "ElementaryTypeName", "src": "690:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "body": { "id": 3366, "nodeType": "Block", "src": "776:103:15", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3355, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3347, "src": "806:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3358, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3347, "src": "836:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3359, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transfer", "nodeType": "MemberAccess", "referencedDeclaration": 3282, "src": "836:14:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 3360, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "836:23:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3361, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3349, "src": "861:2:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3362, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3351, "src": "865:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3356, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "813:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3357, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "813:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3363, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "813:58:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3354, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3545, "src": "786:19:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$3333_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 3364, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "786:86:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3365, "nodeType": "ExpressionStatement", "src": "786:86:15" } ] }, "documentation": null, "id": 3367, "implemented": true, "kind": "function", "modifiers": [], "name": "safeTransfer", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3352, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3347, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3367, "src": "726:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3346, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "726:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3349, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3367, "src": "740:10:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3348, "name": "address", "nodeType": "ElementaryTypeName", "src": "740:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3351, 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"referencedDeclaration": 3369, "src": "1005:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3382, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3369, "src": "1035:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3383, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transferFrom", "nodeType": "MemberAccess", "referencedDeclaration": 3314, "src": "1035:18:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,address,uint256) external returns (bool)" } }, "id": 3384, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1035:27:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3385, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3371, "src": "1064:4:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3386, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3373, "src": "1070:2:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3387, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3375, "src": "1074:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3380, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "1012:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3381, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1012:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3388, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": 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} }, "id": 3390, "nodeType": "ExpressionStatement", "src": "985:96:15" } ] }, "documentation": null, "id": 3392, "implemented": true, "kind": "function", "modifiers": [], "name": "safeTransferFrom", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3376, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3369, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3392, "src": "911:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3368, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "911:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3371, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3392, "src": "925:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3370, "name": "address", "nodeType": "ElementaryTypeName", "src": "925:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3373, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3392, "src": "939:10:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3372, "name": "address", "nodeType": "ElementaryTypeName", "src": "939:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": 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(uint256)" } }, "id": 3414, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1729:39:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 3415, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1772:1:15", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "1729:44:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 3417, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "1728:46:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "1712:62:15", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "5361666545524332303a20617070726f76652066726f6d206e6f6e2d7a65726f20746f206e6f6e2d7a65726f20616c6c6f77616e6365", "id": 3419, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1788:56:15", "subdenomination": null, "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": 3402, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "1704:7:15", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3420, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1704:150:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3421, "nodeType": "ExpressionStatement", "src": "1704:150:15" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3423, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3395, "src": "1884:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3426, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3395, "src": "1914:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3427, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 3302, "src": "1914:13:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 3428, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1914:22:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3429, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3397, "src": "1938:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3430, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3399, "src": "1947:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3424, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "1891:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3425, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1891:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3431, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1891:62:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3422, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3545, "src": "1864:19:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$3333_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 3432, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1864:90:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3433, "nodeType": "ExpressionStatement", "src": "1864:90:15" } ] }, "documentation": { "id": 3393, "nodeType": "StructuredDocumentation", "src": "1094:249:15", "text": " @dev Deprecated. This function has issues similar to the ones found in\n {IERC20-approve}, and its usage is discouraged.\n Whenever possible, use {safeIncreaseAllowance} and\n {safeDecreaseAllowance} instead." }, "id": 3435, "implemented": true, "kind": "function", "modifiers": [], "name": "safeApprove", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3400, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3395, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1369:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3394, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "1369:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3397, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1383:15:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3396, "name": "address", "nodeType": "ElementaryTypeName", "src": "1383:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3399, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3435, "src": "1400:13:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3398, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1400:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1368:46:15" }, "returnParameters": { "id": 3401, "nodeType": "ParameterList", "parameters": [], "src": "1424:0:15" }, "scope": 3546, "src": "1348:613:15", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 3470, "nodeType": "Block", "src": "2053:197:15", "statements": [ { "assignments": [ 3445 ], "declarations": [ { "constant": false, "id": 3445, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3470, "src": "2063:20:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3444, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2063:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3457, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3455, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3441, "src": "2130:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3450, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "2110:4:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } ], "id": 3449, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2102:7:15", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3448, "name": "address", "nodeType": "ElementaryTypeName", "src": "2102:7:15", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3451, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2102:13:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3452, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3439, "src": "2117:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3446, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2086:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3447, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 3292, "src": "2086:15:15", "typeDescriptions": { "typeIdentifier": "t_function_external_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view external returns (uint256)" } }, "id": 3453, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:39:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3454, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 2585, "src": "2086:43:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_uint256_$_t_uint256_$returns$_t_uint256_$bound_to$_t_uint256_$", "typeString": "function (uint256,uint256) pure returns (uint256)" } }, "id": 3456, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2086:50:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "2063:73:15" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3459, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2166:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 3462, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3437, "src": "2196:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3463, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "approve", "nodeType": "MemberAccess", "referencedDeclaration": 3302, "src": "2196:13:15", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,uint256) external returns (bool)" } }, "id": 3464, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2196:22:15", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "id": 3465, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3439, "src": "2220:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3466, "name": "newAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3445, "src": "2229:12:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3460, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "2173:3:15", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 3461, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "2173:22:15", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 3467, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2173:69:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3458, "name": "_callOptionalReturn", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3545, "src": "2146:19:15", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_contract$_IERC20_$3333_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (contract IERC20,bytes memory)" } }, "id": 3468, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2146:97:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3469, "nodeType": "ExpressionStatement", "src": "2146:97:15" } ] }, "documentation": null, "id": 3471, "implemented": true, "kind": "function", "modifiers": [], "name": "safeIncreaseAllowance", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3442, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3437, "mutability": "mutable", "name": "token", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "1998:12:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" }, "typeName": { "contractScope": null, "id": 3436, "name": "IERC20", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3333, "src": "1998:6:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3439, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "2012:15:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3438, "name": "address", "nodeType": "ElementaryTypeName", "src": "2012:7:15", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3441, "mutability": "mutable", "name": "value", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3471, "src": "2029:13:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3440, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2029:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1997:46:15" }, "returnParameters": { "id": 3443, "nodeType": "ParameterList", "parameters": [], "src": "2053:0:15" }, "scope": 3546, "src": "1967:283:15", "stateMutability": "nonpayable", "virtual": false, "visibility": "internal" }, { "body": { "id": 3507, "nodeType": "Block", "src": "2342:242:15", "statements": [ { "assignments": [ 3481 ], "declarations": [ { "constant": false, "id": 3481, "mutability": "mutable", "name": "newAllowance", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3507, "src": "2352:20:15", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3480, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2352:7:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 3494, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3491, "name": "value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3477, "src": "2419:5:15", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "5361666545524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 3492, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "2426:43:15", "subdenomination": null, "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": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3486, "name": "this", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -28, "src": "2399:4:15", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_contract$_SafeERC20_$3546", "typeString": "library SafeERC20" } ], "id": 3485, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2391:7:15", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3484, "name": "address", "nodeType": "ElementaryTypeName", "src": "2391:7:15", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3487, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "2391:13:15", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3488, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3475, "src": "2406:7:15", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3482, "name": "token", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3473, "src": "2375:5:15", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC20_$3333", "typeString": "contract IERC20" } }, "id": 3483, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "allowance", "nodeType": "MemberAccess", "referencedDeclaration": 3292, "src": "2375:15:15", "typeDescriptions": { "typeIdentifier": 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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 } }