{ "contractName": "RRUtils", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.5.16+commit.9c3226ce\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"RRUtils is a library that provides utilities for parsing DNS resource records.\",\"methods\":{}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\":\"RRUtils\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":false,\"runs\":200},\"remappings\":[]},\"sources\":{\"@ensdomains/buffer/contracts/Buffer.sol\":{\"keccak256\":\"0x1264adbd06f6e05b04539bb225063a988b7fa90343d068de60cdde6cfb6fa92d\",\"urls\":[\"bzz-raw://9362e5c8306c61ad32144028b5b6c3a90ff868c86e814d26f096a59243598ed2\",\"dweb:/ipfs/QmQPRLNQu1iN6KHKPbhkGvRZnsKgjddjzEza8Q8oJ5FfwH\"]},\"@ensdomains/dnssec-oracle/contracts/BytesUtils.sol\":{\"keccak256\":\"0x4014e689ef4a36cbf7103d88286abd2a7c560c2a7af99a561c33c61bc78be27a\",\"urls\":[\"bzz-raw://65e6c215e270ca999089bafa672420a7ef03e9f511dedf6aa4e68857f7dff0fe\",\"dweb:/ipfs/QmQVArMTrJwx6xH49mUMCrr6Jdq6ym6f4zRPPpk7y1jK6J\"]},\"@ensdomains/dnssec-oracle/contracts/RRUtils.sol\":{\"keccak256\":\"0x5135591043cf38413b19f93d16f189f0f8b50b01b78642fb764635d9790cc7ca\",\"urls\":[\"bzz-raw://22e073044ad4ebc936866bb29f6bb38184a454038d63f7f7d2f63a57603ffc86\",\"dweb:/ipfs/QmUugBcgtVUUafeK1NBN4vcVmPboZLK18Lc5zVXhZ8nuZh\"]}},\"version\":1}", "bytecode": "0x60556023600b82828239805160001a607314601657fe5b30600052607381538281f3fe73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a723158204c2c2c91818c6af80d8d4a33abcda7f953e0b7c7b55b9f89a38285a73cdf8d0664736f6c63430005100032", "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fdfea265627a7a723158204c2c2c91818c6af80d8d4a33abcda7f953e0b7c7b55b9f89a38285a73cdf8d0664736f6c63430005100032", "sourceMap": "197:7007:22:-;;132:2:-1;166:7;155:9;146:7;137:37;255:7;249:14;246:1;241:23;235:4;232:33;222:2;;269:9;222:2;293:9;290:1;283:20;323:4;314:7;306:22;347:7;338;331:24", "deployedSourceMap": "197:7007:22:-;;;;;;;;", "source": "pragma solidity >0.4.23;\n\nimport \"./BytesUtils.sol\";\nimport \"@ensdomains/buffer/contracts/Buffer.sol\";\n\n/**\n* @dev RRUtils is a library that provides utilities for parsing DNS resource records.\n*/\nlibrary RRUtils {\n using BytesUtils for *;\n using Buffer for *;\n\n /**\n * @dev Returns the number of bytes in the DNS name at 'offset' in 'self'.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return The length of the DNS name at 'offset', in bytes.\n */\n function nameLength(bytes memory self, uint offset) internal pure returns(uint) {\n uint idx = offset;\n while (true) {\n assert(idx < self.length);\n uint labelLen = self.readUint8(idx);\n idx += labelLen + 1;\n if (labelLen == 0) {\n break;\n }\n }\n return idx - offset;\n }\n\n /**\n * @dev Returns a DNS format name at the specified offset of self.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return The name.\n */\n function readName(bytes memory self, uint offset) internal pure returns(bytes memory ret) {\n uint len = nameLength(self, offset);\n return self.substring(offset, len);\n }\n\n /**\n * @dev Returns the number of labels in the DNS name at 'offset' in 'self'.\n * @param self The byte array to read a name from.\n * @param offset The offset to start reading at.\n * @return The number of labels in the DNS name at 'offset', in bytes.\n */\n function labelCount(bytes memory self, uint offset) internal pure returns(uint) {\n uint count = 0;\n while (true) {\n assert(offset < self.length);\n uint labelLen = self.readUint8(offset);\n offset += labelLen + 1;\n if (labelLen == 0) {\n break;\n }\n count += 1;\n }\n return count;\n }\n\n /**\n * @dev An iterator over resource records.\n */\n struct RRIterator {\n bytes data;\n uint offset;\n uint16 dnstype;\n uint16 class;\n uint32 ttl;\n uint rdataOffset;\n uint nextOffset;\n }\n\n /**\n * @dev Begins iterating over resource records.\n * @param self The byte string to read from.\n * @param offset The offset to start reading at.\n * @return An iterator object.\n */\n function iterateRRs(bytes memory self, uint offset) internal pure returns (RRIterator memory ret) {\n ret.data = self;\n ret.nextOffset = offset;\n next(ret);\n }\n\n /**\n * @dev Returns true iff there are more RRs to iterate.\n * @param iter The iterator to check.\n * @return True iff the iterator has finished.\n */\n function done(RRIterator memory iter) internal pure returns(bool) {\n return iter.offset >= iter.data.length;\n }\n\n /**\n * @dev Moves the iterator to the next resource record.\n * @param iter The iterator to advance.\n */\n function next(RRIterator memory iter) internal pure {\n iter.offset = iter.nextOffset;\n if (iter.offset >= iter.data.length) {\n return;\n }\n\n // Skip the name\n uint off = iter.offset + nameLength(iter.data, iter.offset);\n\n // Read type, class, and ttl\n iter.dnstype = iter.data.readUint16(off);\n off += 2;\n iter.class = iter.data.readUint16(off);\n off += 2;\n iter.ttl = iter.data.readUint32(off);\n off += 4;\n\n // Read the rdata\n uint rdataLength = iter.data.readUint16(off);\n off += 2;\n iter.rdataOffset = off;\n iter.nextOffset = off + rdataLength;\n }\n\n /**\n * @dev Returns the name of the current record.\n * @param iter The iterator.\n * @return A new bytes object containing the owner name from the RR.\n */\n function name(RRIterator memory iter) internal pure returns(bytes memory) {\n return iter.data.substring(iter.offset, nameLength(iter.data, iter.offset));\n }\n\n /**\n * @dev Returns the rdata portion of the current record.\n * @param iter The iterator.\n * @return A new bytes object containing the RR's RDATA.\n */\n function rdata(RRIterator memory iter) internal pure returns(bytes memory) {\n return iter.data.substring(iter.rdataOffset, iter.nextOffset - iter.rdataOffset);\n }\n\n /**\n * @dev Checks if a given RR type exists in a type bitmap.\n * @param self The byte string to read the type bitmap from.\n * @param offset The offset to start reading at.\n * @param rrtype The RR type to check for.\n * @return True if the type is found in the bitmap, false otherwise.\n */\n function checkTypeBitmap(bytes memory self, uint offset, uint16 rrtype) internal pure returns (bool) {\n uint8 typeWindow = uint8(rrtype >> 8);\n uint8 windowByte = uint8((rrtype & 0xff) / 8);\n uint8 windowBitmask = uint8(uint8(1) << (uint8(7) - uint8(rrtype & 0x7)));\n for (uint off = offset; off < self.length;) {\n uint8 window = self.readUint8(off);\n uint8 len = self.readUint8(off + 1);\n if (typeWindow < window) {\n // We've gone past our window; it's not here.\n return false;\n } else if (typeWindow == window) {\n // Check this type bitmap\n if (len * 8 <= windowByte) {\n // Our type is past the end of the bitmap\n return false;\n }\n return (self.readUint8(off + windowByte + 2) & windowBitmask) != 0;\n } else {\n // Skip this type bitmap\n off += len + 2;\n }\n }\n\n return false;\n }\n\n function compareNames(bytes memory self, bytes memory other) internal pure returns (int) {\n if (self.equals(other)) {\n return 0;\n }\n\n uint off;\n uint otheroff;\n uint prevoff;\n uint otherprevoff;\n uint counts = labelCount(self, 0);\n uint othercounts = labelCount(other, 0);\n\n // Keep removing labels from the front of the name until both names are equal length\n while (counts > othercounts) {\n prevoff = off;\n off = progress(self, off);\n counts--;\n }\n\n while (othercounts > counts) {\n otherprevoff = otheroff;\n otheroff = progress(other, otheroff);\n othercounts--;\n }\n\n // Compare the last nonequal labels to each other\n while (counts > 0 && !self.equals(off, other, otheroff)) {\n prevoff = off;\n off = progress(self, off);\n otherprevoff = otheroff;\n otheroff = progress(other, otheroff);\n counts -= 1;\n }\n\n if (off == 0) {\n return -1;\n }\n if(otheroff == 0) {\n return 1;\n }\n\n return self.compare(prevoff + 1, self.readUint8(prevoff), other, otherprevoff + 1, other.readUint8(otherprevoff));\n }\n\n function progress(bytes memory body, uint off) internal pure returns(uint) {\n return off + 1 + body.readUint8(off);\n }\n}\n", "sourcePath": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "ast": { "absolutePath": "@ensdomains/dnssec-oracle/contracts/RRUtils.sol", "exportedSymbols": { "RRUtils": [ 6426 ] }, "id": 6427, "nodeType": "SourceUnit", "nodes": [ { "id": 5807, "literals": [ "solidity", ">", "0.4", ".23" ], "nodeType": "PragmaDirective", "src": "0:24:22" }, { "absolutePath": "@ensdomains/dnssec-oracle/contracts/BytesUtils.sol", "file": "./BytesUtils.sol", "id": 5808, "nodeType": "ImportDirective", "scope": 6427, "sourceUnit": 5806, "src": "26:26:22", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@ensdomains/buffer/contracts/Buffer.sol", "file": "@ensdomains/buffer/contracts/Buffer.sol", "id": 5809, "nodeType": "ImportDirective", "scope": 6427, "sourceUnit": 5085, "src": "53:49:22", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [], "contractDependencies": [], "contractKind": "library", "documentation": "@dev RRUtils is a library that provides utilities for parsing DNS resource records.", "fullyImplemented": true, "id": 6426, "linearizedBaseContracts": [ 6426 ], "name": "RRUtils", "nodeType": "ContractDefinition", "nodes": [ { "id": 5811, "libraryName": { "contractScope": null, "id": 5810, "name": "BytesUtils", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5805, "src": "225:10:22", "typeDescriptions": { "typeIdentifier": "t_contract$_BytesUtils_$5805", "typeString": "library BytesUtils" } }, "nodeType": "UsingForDirective", "src": "219:23:22", "typeName": null }, { "id": 5813, "libraryName": { "contractScope": null, "id": 5812, "name": "Buffer", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5084, "src": "253:6:22", "typeDescriptions": { "typeIdentifier": "t_contract$_Buffer_$5084", "typeString": "library Buffer" } }, "nodeType": "UsingForDirective", "src": "247:19:22", "typeName": null }, { "body": { "id": 5859, "nodeType": "Block", "src": "615:287:22", "statements": [ { "assignments": [ 5823 ], "declarations": [ { "constant": false, "id": 5823, "name": "idx", "nodeType": "VariableDeclaration", "scope": 5859, "src": "625:8:22", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5822, "name": "uint", "nodeType": "ElementaryTypeName", "src": "625:4:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 5825, "initialValue": { "argumentTypes": null, "id": 5824, "name": "offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5817, "src": "636:6:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "625:17:22" }, { "body": { "id": 5853, "nodeType": "Block", "src": "665:202:22", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5831, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5828, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5823, "src": "686:3:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "<", "rightExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "id": 5829, "name": "self", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5815, "src": "692:4:22", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 5830, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "692:11:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "686:17:22", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 5827, "name": "assert", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12999, "src": "679:6:22", "typeDescriptions": { "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 5832, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "679:25:22", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 5833, "nodeType": "ExpressionStatement", "src": "679:25:22" }, { "assignments": [ 5835 ], "declarations": [ { "constant": false, "id": 5835, "name": "labelLen", "nodeType": "VariableDeclaration", "scope": 5853, "src": "718:13:22", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5834, "name": "uint", "nodeType": "ElementaryTypeName", "src": "718:4:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "id": 5840, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 5838, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5823, "src": "749:3:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 5836, "name": "self", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5815, "src": "734:4:22", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "id": 5837, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "readUint8", "nodeType": "MemberAccess", "referencedDeclaration": 5391, "src": "734:14:22", "typeDescriptions": { "typeIdentifier": "t_function_internal_pure$_t_bytes_memory_ptr_$_t_uint256_$returns$_t_uint8_$bound_to$_t_bytes_memory_ptr_$", "typeString": "function (bytes memory,uint256) pure returns (uint8)" } }, "id": 5839, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "734:19:22", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "nodeType": "VariableDeclarationStatement", "src": "718:35:22" }, { "expression": { "argumentTypes": null, "id": 5845, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 5841, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5823, "src": "767:3:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5844, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5842, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5835, "src": "774:8:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 5843, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "785:1:22", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "774:12:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "767:19:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 5846, "nodeType": "ExpressionStatement", "src": "767:19:22" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5849, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5847, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5835, "src": "804:8:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 5848, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "816:1:22", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "804:13:22", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 5852, "nodeType": "IfStatement", "src": "800:57:22", "trueBody": { "id": 5851, "nodeType": "Block", "src": "819:38:22", "statements": [ { "id": 5850, "nodeType": "Break", "src": "837:5:22" } ] } } ] }, "condition": { "argumentTypes": null, "hexValue": "74727565", "id": 5826, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "659:4:22", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "id": 5854, "nodeType": "WhileStatement", "src": "652:215:22" }, { "expression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5857, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5855, "name": "idx", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5823, "src": "883:3:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "argumentTypes": null, "id": 5856, "name": "offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5817, "src": "889:6:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "883:12:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 5821, "id": 5858, "nodeType": "Return", "src": "876:19:22" } ] }, "documentation": "@dev Returns the number of bytes in the DNS name at 'offset' in 'self'.\n@param self The byte array to read a name from.\n@param offset The offset to start reading at.\n@return The length of the DNS name at 'offset', in bytes.", "id": 5860, "implemented": true, "kind": "function", "modifiers": [], "name": "nameLength", "nodeType": "FunctionDefinition", "parameters": { "id": 5818, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5815, "name": "self", "nodeType": "VariableDeclaration", "scope": 5860, "src": "555:17:22", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 5814, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "555:5:22", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 5817, "name": "offset", "nodeType": "VariableDeclaration", "scope": 5860, "src": "574:11:22", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5816, "name": "uint", "nodeType": "ElementaryTypeName", "src": "574:4:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "554:32:22" }, "returnParameters": { "id": 5821, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5820, "name": "", "nodeType": "VariableDeclaration", "scope": 5860, "src": "609:4:22", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5819, "name": "uint", "nodeType": "ElementaryTypeName", "src": "609:4:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "608:6:22" }, "scope": 6426, "src": "535:367:22", "stateMutability": "pure", "superFunction": null, "visibility": "internal" }, { "body": { 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"name": "offset", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5887, "src": "1824:6:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5914, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5912, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5905, "src": "1834:8:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "argumentTypes": null, "hexValue": "31", "id": 5913, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1845:1:22", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "1834:12:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "1824:22:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 5916, "nodeType": "ExpressionStatement", "src": "1824:22:22" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 5919, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 5917, "name": "labelLen", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5905, "src": "1864:8:22", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 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