{ "contractName": "SafeERC20", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.4.24+commit.e67f0147\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/erc/SafeERC20.sol\":\"SafeERC20\"},\"evmVersion\":\"byzantium\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/erc/SafeERC20.sol\":{\"keccak256\":\"0x028b5ed3a8e362a108a095120ab5d87bb477834bc45a9627b3592e2fe0cddd5e\",\"urls\":[\"bzzr://9be226bd300adfbe60e61f25e15dd798e04f6ef8580c41284812cc44c341cfa7\"]}},\"version\":1}", "bytecode": "0x605a602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f30073000000000000000000000000000000000000000030146080604052600080fd00a265627a7a72305820cbe747a2b109bc8d4e52febc7a21320b76c7cb068d4500350858fd4920ee4fab6c6578706572696d656e74616cf50037", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fd00a265627a7a72305820cbe747a2b109bc8d4e52febc7a21320b76c7cb068d4500350858fd4920ee4fab6c6578706572696d656e74616cf50037", "sourceMap": "351:1647:2:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24", "deployedSourceMap": "351:1647:2:-;;;;;;;;", "source": "pragma solidity >=0.4.24;\npragma experimental ABIEncoderV2;\n\n/**\n对ERC20的一个包装，实现ERC20的合约很多，但是存在一些不合规的合约，\n在转账完成后没有正确的返回一个布尔值表示成功或者失败。\nSafeERC20通过对返回值的检测，补足返回值，尤其是在合约里操作ERC20时建议使用\n */\nlibrary SafeERC20 {\n function isContract(address addr) internal view {\n assembly {\n if iszero(extcodesize(addr)) {\n revert(0, 0)\n }\n }\n }\n\n function handleReturnData(address _erc20Addr, bytes memory _msg)\n internal\n returns (bool result)\n {\n uint256 msgSize = _msg.length;\n assembly {\n if iszero(\n call(gas(), _erc20Addr, 0, add(_msg, 0x20), msgSize, 0x00, 0x20)\n ) {\n revert(0, 0)\n }\n switch returndatasize()\n case 0 {\n // not a std erc20\n result := 1\n }\n case 32 {\n // std erc20\n returndatacopy(0, 0, 32)\n result := mload(0)\n }\n default {\n // anything else, should revert for safety\n revert(0, 0)\n }\n }\n }\n\n function safeTransfer(\n address _erc20Addr,\n address _to,\n uint256 _value\n ) internal returns (bool result) {\n // Must be a contract addr first!\n isContract(_erc20Addr);\n\n bytes memory _msg =\n abi.encodeWithSignature(\"transfer(address,uint256)\", _to, _value);\n\n // handle returndata\n return handleReturnData(_erc20Addr, _msg);\n }\n\n function safeTransferFrom(\n address _erc20Addr,\n address _from,\n address _to,\n uint256 _value\n ) internal returns (bool result) {\n // Must be a contract addr first!\n isContract(_erc20Addr);\n\n // call return false when something wrong\n bytes memory _msg =\n abi.encodeWithSignature(\n \"transferFrom(address,address,uint256)\",\n _from,\n _to,\n _value\n );\n\n // handle returndata\n return handleReturnData(_erc20Addr, _msg);\n }\n}\n", "sourcePath": "/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/erc/SafeERC20.sol", "ast": { "absolutePath": "/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/erc/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 784 ] }, "id": 785, "nodeType": "SourceUnit", "nodes": [ { "id": 696, "literals": [ "solidity", ">=", "0.4", ".24" ], "nodeType": "PragmaDirective", "src": "0:25:2" }, { "id": 697, "literals": [ "experimental", "ABIEncoderV2" ], "nodeType": "PragmaDirective", "src": "26:33:2" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "对ERC20的一个包装，实现ERC20的合约很多，但是存在一些不合规的合约，\n在转账完成后没有正确的返回一个布尔值表示成功或者失败。\nSafeERC20通过对返回值的检测，补足返回值，尤其是在合约里操作ERC20时建议使用", "fullyImplemented": true, "id": 784, "linearizedBaseContracts": [ 784 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 703, "nodeType": "Block", "src": "421:92:2", "statements": [ { "externalReferences": [ { "addr": { "declaration": 699, "isOffset": false, "isSlot": false, "src": "466:4:2", "valueSize": 1 } } ], "id": 702, "nodeType": "InlineAssembly", "operations": "{\n if iszero(extcodesize(addr))\n {\n revert(0, 0)\n }\n}", "src": "427:86:2" } ] }, "documentation": null, "id": 704, "implemented": true, "isConstructor": false, "isDeclaredConst": true, "modifiers": [], "name": "isContract", "nodeType": "FunctionDefinition", "parameters": { "id": 700, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 699, "name": "addr", "nodeType": "VariableDeclaration", "scope": 704, "src": "393:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 698, "name": "address", "nodeType": "ElementaryTypeName", "src": "393:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "src": "392:14:2" }, "payable": false, "returnParameters": { "id": 701, "nodeType": "ParameterList", "parameters": [], "src": "421:0:2" }, "scope": 784, "src": "373:140:2", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 719, "nodeType": "Block", "src": "623:517:2", "statements": [ { "assignments": [ 714 ], "declarations": [ { "constant": false, "id": 714, "name": "msgSize", "nodeType": "VariableDeclaration", "scope": 720, "src": "629:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 713, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "629:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 717, "initialValue": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 715, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 708, "src": "647:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 716, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "647:11:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "629:29:2" }, { "externalReferences": [ { "result": { "declaration": 711, "isOffset": false, "isSlot": false, "src": "890:6:2", "valueSize": 1 } }, { "_erc20Addr": { "declaration": 706, "isOffset": false, "isSlot": false, "src": "712:10:2", "valueSize": 1 } }, { "msgSize": { "declaration": 714, "isOffset": false, "isSlot": false, "src": "744:7:2", "valueSize": 1 } }, { "_msg": { "declaration": 708, "isOffset": false, "isSlot": false, "src": "731:4:2", "valueSize": 1 } }, { "result": { "declaration": 711, "isOffset": false, "isSlot": false, "src": "998:6:2", "valueSize": 1 } } ], "id": 718, "nodeType": "InlineAssembly", "operations": "{\n if iszero(call(gas(), _erc20Addr, 0, add(_msg, 0x20), msgSize, 0x00, 0x20))\n {\n revert(0, 0)\n }\n switch returndatasize()\n case 0 {\n result := 1\n }\n case 32 {\n returndatacopy(0, 0, 32)\n result := mload(0)\n }\n default {\n revert(0, 0)\n }\n}", "src": "664:476:2" } ] }, "documentation": null, "id": 720, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "handleReturnData", "nodeType": "FunctionDefinition", "parameters": { "id": 709, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 706, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 720, "src": "543:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 705, "name": "address", "nodeType": "ElementaryTypeName", "src": "543:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 708, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 720, "src": "563:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 707, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "563:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "542:39:2" }, "payable": false, "returnParameters": { "id": 712, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 711, "name": "result", "nodeType": "VariableDeclaration", "scope": 720, "src": "608:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 710, "name": "bool", "nodeType": "ElementaryTypeName", "src": "608:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "607:13:2" }, "scope": 784, "src": "517:623:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" }, { "body": { "id": 749, "nodeType": "Block", "src": "1262:242:2", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 732, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 722, "src": "1317:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 731, "name": "isContract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 704, "src": "1306:10:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$__$", "typeString": "function (address) view" } }, "id": 733, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1306:22:2", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 734, "nodeType": "ExpressionStatement", "src": "1306:22:2" }, { "assignments": [ 736 ], "declarations": [ { "constant": false, "id": 736, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 750, "src": "1335:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 735, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1335:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 743, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "7472616e7366657228616464726573732c75696e7432353629", "id": 739, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1385:27:2", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" }, "value": "transfer(address,uint256)" }, { "argumentTypes": null, "id": 740, "name": "_to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 724, "src": "1414:3:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 741, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 726, "src": "1419:6:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 737, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9028, "src": "1361:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 738, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSignature", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1361:23:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithsignature_pure$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (string memory) pure returns (bytes memory)" } }, "id": 742, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1361:65:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "1335:91:2" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 745, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 722, "src": "1482:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 746, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 736, "src": "1494:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 744, "name": "handleReturnData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 720, "src": "1465:16:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,bytes memory) returns (bool)" } }, "id": 747, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1465:34:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 730, "id": 748, "nodeType": "Return", "src": "1458:41:2" } ] }, "documentation": null, "id": 750, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "safeTransfer", "nodeType": "FunctionDefinition", "parameters": { "id": 727, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 722, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 750, "src": "1171:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 721, "name": "address", "nodeType": "ElementaryTypeName", "src": "1171:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 724, "name": "_to", "nodeType": "VariableDeclaration", "scope": 750, "src": "1195:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 723, "name": "address", "nodeType": "ElementaryTypeName", "src": "1195:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 726, "name": "_value", "nodeType": "VariableDeclaration", "scope": 750, "src": "1212:14:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 725, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1212:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1165:65:2" }, "payable": false, "returnParameters": { "id": 730, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 729, "name": "result", "nodeType": "VariableDeclaration", "scope": 750, "src": "1249:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 728, "name": "bool", "nodeType": "ElementaryTypeName", "src": "1249:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "1248:13:2" }, "scope": 784, "src": "1144:360:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" }, { "body": { "id": 782, "nodeType": "Block", "src": "1649:347:2", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 764, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 752, "src": "1704:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 763, "name": "isContract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 704, "src": "1693:10:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$__$", "typeString": "function (address) view" } }, "id": 765, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1693:22:2", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 766, "nodeType": "ExpressionStatement", "src": "1693:22:2" }, { "assignments": [ 768 ], "declarations": [ { "constant": false, "id": 768, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 783, "src": "1768:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 767, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1768:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 776, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "7472616e7366657246726f6d28616464726573732c616464726573732c75696e7432353629", "id": 771, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1827:39:2", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" }, "value": "transferFrom(address,address,uint256)" }, { "argumentTypes": null, "id": 772, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 754, "src": "1876:5:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 773, "name": "_to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 756, "src": "1891:3:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 774, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 758, "src": "1904:6:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 769, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9028, "src": "1794:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 770, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSignature", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1794:23:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithsignature_pure$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (string memory) pure returns (bytes memory)" } }, "id": 775, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1794:124:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "1768:150:2" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 778, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 752, "src": "1974:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 779, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 768, "src": "1986:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 777, "name": "handleReturnData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 720, "src": "1957:16:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,bytes memory) returns (bool)" } }, "id": 780, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1957:34:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 762, "id": 781, "nodeType": "Return", "src": "1950:41:2" } ] }, "documentation": null, "id": 783, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "safeTransferFrom", "nodeType": "FunctionDefinition", "parameters": { "id": 759, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 752, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 783, "src": "1539:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 751, "name": "address", "nodeType": "ElementaryTypeName", "src": "1539:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 754, "name": "_from", "nodeType": "VariableDeclaration", "scope": 783, "src": "1563:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 753, "name": "address", "nodeType": "ElementaryTypeName", "src": "1563:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 756, "name": "_to", "nodeType": "VariableDeclaration", "scope": 783, "src": "1582:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 755, "name": "address", "nodeType": "ElementaryTypeName", "src": "1582:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 758, "name": "_value", "nodeType": "VariableDeclaration", "scope": 783, "src": "1599:14:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 757, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1599:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1533:84:2" }, "payable": false, "returnParameters": { "id": 762, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 761, "name": "result", "nodeType": "VariableDeclaration", "scope": 783, "src": "1636:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 760, "name": "bool", "nodeType": "ElementaryTypeName", "src": "1636:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "1635:13:2" }, "scope": 784, "src": "1508:488:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" } ], "scope": 785, "src": "351:1647:2" } ], "src": "0:1999:2" }, "legacyAST": { "absolutePath": "/Users/chtian/Documents/01_work/01_develope/jcc/jcc-solidity-utils/contracts/erc/SafeERC20.sol", "exportedSymbols": { "SafeERC20": [ 784 ] }, "id": 785, "nodeType": "SourceUnit", "nodes": [ { "id": 696, "literals": [ "solidity", ">=", "0.4", ".24" ], "nodeType": "PragmaDirective", "src": "0:25:2" }, { "id": 697, "literals": [ "experimental", "ABIEncoderV2" ], "nodeType": "PragmaDirective", "src": "26:33:2" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "对ERC20的一个包装，实现ERC20的合约很多，但是存在一些不合规的合约，\n在转账完成后没有正确的返回一个布尔值表示成功或者失败。\nSafeERC20通过对返回值的检测，补足返回值，尤其是在合约里操作ERC20时建议使用", "fullyImplemented": true, "id": 784, "linearizedBaseContracts": [ 784 ], "name": "SafeERC20", "nodeType": "ContractDefinition", "nodes": [ { "body": { "id": 703, "nodeType": "Block", "src": "421:92:2", "statements": [ { "externalReferences": [ { "addr": { "declaration": 699, "isOffset": false, "isSlot": false, "src": "466:4:2", "valueSize": 1 } } ], "id": 702, "nodeType": "InlineAssembly", "operations": "{\n if iszero(extcodesize(addr))\n {\n revert(0, 0)\n }\n}", "src": "427:86:2" } ] }, "documentation": null, "id": 704, "implemented": true, "isConstructor": false, "isDeclaredConst": true, "modifiers": [], "name": "isContract", "nodeType": "FunctionDefinition", "parameters": { "id": 700, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 699, "name": "addr", "nodeType": "VariableDeclaration", "scope": 704, "src": "393:12:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 698, "name": "address", "nodeType": "ElementaryTypeName", "src": "393:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "src": "392:14:2" }, "payable": false, "returnParameters": { "id": 701, "nodeType": "ParameterList", "parameters": [], "src": "421:0:2" }, "scope": 784, "src": "373:140:2", "stateMutability": "view", "superFunction": null, "visibility": "internal" }, { "body": { "id": 719, "nodeType": "Block", "src": "623:517:2", "statements": [ { "assignments": [ 714 ], "declarations": [ { "constant": false, "id": 714, "name": "msgSize", "nodeType": "VariableDeclaration", "scope": 720, "src": "629:15:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 713, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "629:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 717, "initialValue": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 715, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 708, "src": "647:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 716, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "647:11:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "629:29:2" }, { "externalReferences": [ { "result": { "declaration": 711, "isOffset": false, "isSlot": false, "src": "890:6:2", "valueSize": 1 } }, { "_erc20Addr": { "declaration": 706, "isOffset": false, "isSlot": false, "src": "712:10:2", "valueSize": 1 } }, { "msgSize": { "declaration": 714, "isOffset": false, "isSlot": false, "src": "744:7:2", "valueSize": 1 } }, { "_msg": { "declaration": 708, "isOffset": false, "isSlot": false, "src": "731:4:2", "valueSize": 1 } }, { "result": { "declaration": 711, "isOffset": false, "isSlot": false, "src": "998:6:2", "valueSize": 1 } } ], "id": 718, "nodeType": "InlineAssembly", "operations": "{\n if iszero(call(gas(), _erc20Addr, 0, add(_msg, 0x20), msgSize, 0x00, 0x20))\n {\n revert(0, 0)\n }\n switch returndatasize()\n case 0 {\n result := 1\n }\n case 32 {\n returndatacopy(0, 0, 32)\n result := mload(0)\n }\n default {\n revert(0, 0)\n }\n}", "src": "664:476:2" } ] }, "documentation": null, "id": 720, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "handleReturnData", "nodeType": "FunctionDefinition", "parameters": { "id": 709, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 706, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 720, "src": "543:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 705, "name": "address", "nodeType": "ElementaryTypeName", "src": "543:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 708, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 720, "src": "563:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 707, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "563:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "542:39:2" }, "payable": false, "returnParameters": { "id": 712, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 711, "name": "result", "nodeType": "VariableDeclaration", "scope": 720, "src": "608:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 710, "name": "bool", "nodeType": "ElementaryTypeName", "src": "608:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "607:13:2" }, "scope": 784, "src": "517:623:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" }, { "body": { "id": 749, "nodeType": "Block", "src": "1262:242:2", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 732, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 722, "src": "1317:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 731, "name": "isContract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 704, "src": "1306:10:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$__$", "typeString": "function (address) view" } }, "id": 733, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1306:22:2", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 734, "nodeType": "ExpressionStatement", "src": "1306:22:2" }, { "assignments": [ 736 ], "declarations": [ { "constant": false, "id": 736, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 750, "src": "1335:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 735, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1335:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 743, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "7472616e7366657228616464726573732c75696e7432353629", "id": 739, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1385:27:2", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" }, "value": "transfer(address,uint256)" }, { "argumentTypes": null, "id": 740, "name": "_to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 724, "src": "1414:3:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 741, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 726, "src": "1419:6:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_a9059cbb2ab09eb219583f4a59a5d0623ade346d962bcd4e46b11da047c9049b", "typeString": "literal_string \"transfer(address,uint256)\"" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 737, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9028, "src": "1361:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 738, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSignature", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1361:23:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithsignature_pure$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (string memory) pure returns (bytes memory)" } }, "id": 742, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1361:65:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "1335:91:2" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 745, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 722, "src": "1482:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 746, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 736, "src": "1494:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 744, "name": "handleReturnData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 720, "src": "1465:16:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,bytes memory) returns (bool)" } }, "id": 747, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1465:34:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 730, "id": 748, "nodeType": "Return", "src": "1458:41:2" } ] }, "documentation": null, "id": 750, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "safeTransfer", "nodeType": "FunctionDefinition", "parameters": { "id": 727, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 722, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 750, "src": "1171:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 721, "name": "address", "nodeType": "ElementaryTypeName", "src": "1171:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 724, "name": "_to", "nodeType": "VariableDeclaration", "scope": 750, "src": "1195:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 723, "name": "address", "nodeType": "ElementaryTypeName", "src": "1195:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 726, "name": "_value", "nodeType": "VariableDeclaration", "scope": 750, "src": "1212:14:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 725, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1212:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1165:65:2" }, "payable": false, "returnParameters": { "id": 730, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 729, "name": "result", "nodeType": "VariableDeclaration", "scope": 750, "src": "1249:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 728, "name": "bool", "nodeType": "ElementaryTypeName", "src": "1249:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "1248:13:2" }, "scope": 784, "src": "1144:360:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" }, { "body": { "id": 782, "nodeType": "Block", "src": "1649:347:2", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 764, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 752, "src": "1704:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 763, "name": "isContract", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 704, "src": "1693:10:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$__$", "typeString": "function (address) view" } }, "id": 765, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1693:22:2", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 766, "nodeType": "ExpressionStatement", "src": "1693:22:2" }, { "assignments": [ 768 ], "declarations": [ { "constant": false, "id": 768, "name": "_msg", "nodeType": "VariableDeclaration", "scope": 783, "src": "1768:17:2", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 767, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "1768:5:2", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 776, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "7472616e7366657246726f6d28616464726573732c616464726573732c75696e7432353629", "id": 771, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "1827:39:2", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" }, "value": "transferFrom(address,address,uint256)" }, { "argumentTypes": null, "id": 772, "name": "_from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 754, "src": "1876:5:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 773, "name": "_to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 756, "src": "1891:3:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 774, "name": "_value", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 758, "src": "1904:6:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_stringliteral_23b872dd7302113369cda2901243429419bec145408fa8b352b3dd92b66c680b", "typeString": "literal_string \"transferFrom(address,address,uint256)\"" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 769, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 9028, "src": "1794:3:2", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 770, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSignature", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "1794:23:2", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithsignature_pure$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$", "typeString": "function (string memory) pure returns (bytes memory)" } }, "id": 775, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1794:124:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "1768:150:2" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 778, "name": "_erc20Addr", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 752, "src": "1974:10:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 779, "name": "_msg", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 768, "src": "1986:4:2", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 777, "name": "handleReturnData", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 720, "src": "1957:16:2", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,bytes memory) returns (bool)" } }, "id": 780, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "1957:34:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 762, "id": 781, "nodeType": "Return", "src": "1950:41:2" } ] }, "documentation": null, "id": 783, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "safeTransferFrom", "nodeType": "FunctionDefinition", "parameters": { "id": 759, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 752, "name": "_erc20Addr", "nodeType": "VariableDeclaration", "scope": 783, "src": "1539:18:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 751, "name": "address", "nodeType": "ElementaryTypeName", "src": "1539:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 754, "name": "_from", "nodeType": "VariableDeclaration", "scope": 783, "src": "1563:13:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 753, "name": "address", "nodeType": "ElementaryTypeName", "src": "1563:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 756, "name": "_to", "nodeType": "VariableDeclaration", "scope": 783, "src": "1582:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 755, "name": "address", "nodeType": "ElementaryTypeName", "src": "1582:7:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 758, "name": "_value", "nodeType": "VariableDeclaration", "scope": 783, "src": "1599:14:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 757, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1599:7:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "1533:84:2" }, "payable": false, "returnParameters": { "id": 762, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 761, "name": "result", "nodeType": "VariableDeclaration", "scope": 783, "src": "1636:11:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 760, "name": "bool", "nodeType": "ElementaryTypeName", "src": "1636:4:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "1635:13:2" }, "scope": 784, "src": "1508:488:2", "stateMutability": "nonpayable", "superFunction": null, "visibility": "internal" } ], "scope": 785, "src": "351:1647:2" } ], "src": "0:1999:2" }, "compiler": { "name": "solc", "version": "0.4.24+commit.e67f0147.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.0.16", "updatedAt": "2021-03-06T09:30:00.934Z", "devdoc": { "methods": {} }, "userdoc": { "methods": {} } }