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"hexValue": "30", "id": 11906, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "2835:1:19", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 11905, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "2827:7:19", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 11904, "name": "address", "nodeType": "ElementaryTypeName", "src": "2827:7:19", "typeDescriptions": {} } }, "id": 11907, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "2827:10:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "2821:16:19", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": { "condition": { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 11916, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 11914, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11851, "src": "2919:2:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "id": 11915, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11849, "src": "2925:4:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "2919:10:19", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 11923, "nodeType": "IfStatement", "src": "2915:81:19", "trueBody": { "id": 11922, "nodeType": "Block", "src": "2931:65:19", "statements": [ { "expression": { "arguments": [ { "id": 11918, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11851, "src": "2973:2:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 11919, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11878, "src": "2977:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 11917, "name": "_addTokenToOwnerEnumeration", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11956, "src": "2945:27:19", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 11920, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "2945:40:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11921, "nodeType": "ExpressionStatement", "src": "2945:40:19" } ] } }, "id": 11924, "nodeType": "IfStatement", "src": "2817:179:19", "trueBody": { "id": 11913, "nodeType": "Block", "src": "2839:70:19", "statements": [ { "expression": { "arguments": [ { "id": 11910, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11878, "src": "2890:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 11909, "name": "_removeTokenFromAllTokensEnumeration", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12087, "src": "2853:36:19", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_uint256_$returns$__$", "typeString": "function (uint256)" } }, "id": 11911, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "2853:45:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11912, "nodeType": "ExpressionStatement", "src": "2853:45:19" } ] } } ] }, "documentation": { "id": 11847, "nodeType": "StructuredDocumentation", "src": "2049:58:19", "text": " @dev See {ERC721-_beforeTokenTransfer}." }, "id": 11926, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nameLocation": "2121:20:19", "nodeType": "FunctionDefinition", "overrides": { "id": 11857, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2264:8:19" }, "parameters": { "id": 11856, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11849, "mutability": "mutable", "name": "from", "nameLocation": "2159:4:19", "nodeType": "VariableDeclaration", "scope": 11926, "src": "2151:12:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 11848, "name": "address", "nodeType": "ElementaryTypeName", "src": "2151:7:19", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 11851, "mutability": "mutable", "name": "to", "nameLocation": "2181:2:19", "nodeType": "VariableDeclaration", "scope": 11926, "src": "2173:10:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 11850, "name": "address", "nodeType": "ElementaryTypeName", "src": "2173:7:19", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 11853, "mutability": "mutable", "name": "firstTokenId", "nameLocation": "2201:12:19", "nodeType": "VariableDeclaration", "scope": 11926, "src": "2193:20:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11852, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2193:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" }, { "constant": false, "id": 11855, "mutability": "mutable", "name": "batchSize", "nameLocation": "2231:9:19", "nodeType": "VariableDeclaration", "scope": 11926, "src": "2223:17:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11854, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "2223:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "2141:105:19" }, "returnParameters": { "id": 11858, "nodeType": "ParameterList", "parameters": [], "src": "2273:0:19" }, "scope": 12088, "src": "2112:890:19", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 11955, "nodeType": "Block", "src": "3370:143:19", "statements": [ { "assignments": [ 11935 ], "declarations": [ { "constant": false, "id": 11935, "mutability": "mutable", "name": "length", "nameLocation": "3388:6:19", "nodeType": "VariableDeclaration", "scope": 11955, "src": "3380:14:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11934, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3380:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 11940, "initialValue": { "arguments": [ { "id": 11938, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11929, "src": "3414:2:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 11936, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15797, "src": "3397:6:19", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$15797_$", "typeString": "type(contract ERC721)" } }, "id": 11937, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "3404:9:19", "memberName": "balanceOf", "nodeType": "MemberAccess", "referencedDeclaration": 14988, "src": "3397:16:19", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$_t_uint256_$", "typeString": "function (address) view returns (uint256)" } }, "id": 11939, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "3397:20:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "3380:37:19" }, { "expression": { "id": 11947, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "baseExpression": { "id": 11941, "name": "_ownedTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11749, "src": "3427:12:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_uint256_$_t_uint256_$_$", "typeString": "mapping(address => mapping(uint256 => uint256))" } }, "id": 11944, "indexExpression": { "id": 11942, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11929, "src": "3440:2:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "3427:16:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 11945, "indexExpression": { "id": 11943, "name": "length", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11935, "src": "3444:6:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "3427:24:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 11946, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11931, "src": "3454:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "3427:34:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11948, "nodeType": "ExpressionStatement", "src": "3427:34:19" }, { "expression": { "id": 11953, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 11949, "name": "_ownedTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11753, "src": "3471:17:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 11951, "indexExpression": { "id": 11950, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11931, "src": "3489:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "3471:26:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 11952, "name": "length", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11935, "src": "3500:6:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "3471:35:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11954, "nodeType": "ExpressionStatement", "src": "3471:35:19" } ] }, "documentation": { "id": 11927, "nodeType": "StructuredDocumentation", "src": "3008:283:19", "text": " @dev Private function to add a token to this extension's ownership-tracking data structures.\n @param to address representing the new owner of the given token ID\n @param tokenId uint256 ID of the token to be added to the tokens list of the given address" }, "id": 11956, "implemented": true, "kind": "function", "modifiers": [], "name": "_addTokenToOwnerEnumeration", "nameLocation": "3305:27:19", "nodeType": "FunctionDefinition", "parameters": { "id": 11932, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11929, "mutability": "mutable", "name": "to", "nameLocation": "3341:2:19", "nodeType": "VariableDeclaration", "scope": 11956, "src": "3333:10:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 11928, "name": "address", "nodeType": "ElementaryTypeName", "src": "3333:7:19", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 11931, "mutability": "mutable", "name": "tokenId", "nameLocation": "3353:7:19", "nodeType": "VariableDeclaration", "scope": 11956, "src": "3345:15:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11930, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3345:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3332:29:19" }, "returnParameters": { "id": 11933, "nodeType": "ParameterList", "parameters": [], "src": "3370:0:19" }, "scope": 12088, "src": "3296:217:19", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" }, { "body": { "id": 11975, "nodeType": "Block", "src": "3774:95:19", "statements": [ { "expression": { "id": 11967, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 11962, "name": "_allTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11760, "src": "3784:15:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 11964, "indexExpression": { "id": 11963, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11959, "src": "3800:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "3784:24:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "expression": { "id": 11965, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "3811:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 11966, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "3822:6:19", "memberName": "length", "nodeType": "MemberAccess", "src": "3811:17:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "3784:44:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 11968, "nodeType": "ExpressionStatement", "src": "3784:44:19" }, { "expression": { "arguments": [ { "id": 11972, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11959, "src": "3854:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 11969, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "3838:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 11971, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "3849:4:19", "memberName": "push", "nodeType": "MemberAccess", "src": "3838:15:19", "typeDescriptions": { "typeIdentifier": "t_function_arraypush_nonpayable$_t_array$_t_uint256_$dyn_storage_ptr_$_t_uint256_$returns$__$attached_to$_t_array$_t_uint256_$dyn_storage_ptr_$", "typeString": "function (uint256[] storage pointer,uint256)" } }, "id": 11973, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "3838:24:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 11974, "nodeType": "ExpressionStatement", "src": "3838:24:19" } ] }, "documentation": { "id": 11957, "nodeType": "StructuredDocumentation", "src": "3519:184:19", "text": " @dev Private function to add a token to this extension's token tracking data structures.\n @param tokenId uint256 ID of the token to be added to the tokens list" }, "id": 11976, "implemented": true, "kind": "function", "modifiers": [], "name": "_addTokenToAllTokensEnumeration", "nameLocation": "3717:31:19", "nodeType": "FunctionDefinition", "parameters": { "id": 11960, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11959, "mutability": "mutable", "name": "tokenId", "nameLocation": "3757:7:19", "nodeType": "VariableDeclaration", "scope": 11976, "src": "3749:15:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11958, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3749:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3748:17:19" }, "returnParameters": { "id": 11961, "nodeType": "ParameterList", "parameters": [], "src": "3774:0:19" }, "scope": 12088, "src": "3708:161:19", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" }, { "body": { "id": 12038, "nodeType": "Block", "src": "4567:889:19", "statements": [ { "assignments": [ 11985 ], "declarations": [ { "constant": false, "id": 11985, "mutability": "mutable", "name": "lastTokenIndex", "nameLocation": "4756:14:19", "nodeType": "VariableDeclaration", "scope": 12038, "src": "4748:22:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11984, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4748:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 11992, "initialValue": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 11991, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 11988, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11979, "src": "4790:4:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 11986, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 15797, "src": "4773:6:19", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$15797_$", "typeString": "type(contract ERC721)" } }, "id": 11987, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "4780:9:19", "memberName": "balanceOf", "nodeType": "MemberAccess", "referencedDeclaration": 14988, "src": "4773:16:19", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$_t_uint256_$", "typeString": "function (address) view returns (uint256)" } }, "id": 11989, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "4773:22:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "hexValue": "31", "id": 11990, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "4798:1:19", "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "4773:26:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "4748:51:19" }, { "assignments": [ 11994 ], "declarations": [ { "constant": false, "id": 11994, "mutability": "mutable", "name": "tokenIndex", "nameLocation": "4817:10:19", "nodeType": "VariableDeclaration", "scope": 12038, "src": "4809:18:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11993, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4809:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 11998, "initialValue": { "baseExpression": { "id": 11995, "name": "_ownedTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11753, "src": "4830:17:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 11997, "indexExpression": { "id": 11996, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11981, "src": "4848:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4830:26:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "4809:47:19" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12001, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 11999, "name": "tokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11994, "src": "4960:10:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "id": 12000, "name": "lastTokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11985, "src": "4974:14:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "4960:28:19", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 12025, "nodeType": "IfStatement", "src": "4956:323:19", "trueBody": { "id": 12024, "nodeType": "Block", "src": "4990:289:19", "statements": [ { "assignments": [ 12003 ], "declarations": [ { "constant": false, "id": 12003, "mutability": "mutable", "name": "lastTokenId", "nameLocation": "5012:11:19", "nodeType": "VariableDeclaration", "scope": 12024, "src": "5004:19:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12002, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5004:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 12009, "initialValue": { "baseExpression": { "baseExpression": { "id": 12004, "name": "_ownedTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11749, "src": "5026:12:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_uint256_$_t_uint256_$_$", "typeString": "mapping(address => mapping(uint256 => uint256))" } }, "id": 12006, "indexExpression": { "id": 12005, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11979, "src": "5039:4:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "5026:18:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12008, "indexExpression": { "id": 12007, "name": "lastTokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11985, "src": "5045:14:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "5026:34:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "5004:56:19" }, { "expression": { "id": 12016, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "baseExpression": { "id": 12010, "name": "_ownedTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11749, "src": "5075:12:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_uint256_$_t_uint256_$_$", "typeString": "mapping(address => mapping(uint256 => uint256))" } }, "id": 12013, "indexExpression": { "id": 12011, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11979, "src": "5088:4:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "5075:18:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12014, "indexExpression": { "id": 12012, "name": "tokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11994, "src": "5094:10:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "5075:30:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 12015, "name": "lastTokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12003, "src": "5108:11:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "5075:44:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 12017, "nodeType": "ExpressionStatement", "src": "5075:44:19" }, { "expression": { "id": 12022, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 12018, "name": "_ownedTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11753, "src": "5191:17:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12020, "indexExpression": { "id": 12019, "name": "lastTokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12003, "src": "5209:11:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "5191:30:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 12021, "name": "tokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11994, "src": "5224:10:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "5191:43:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 12023, "nodeType": "ExpressionStatement", "src": "5191:43:19" } ] } }, { "expression": { "id": 12029, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "delete", "prefix": true, "src": "5365:33:19", "subExpression": { "baseExpression": { "id": 12026, "name": "_ownedTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11753, "src": "5372:17:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12028, "indexExpression": { "id": 12027, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11981, "src": "5390:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "5372:26:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12030, "nodeType": "ExpressionStatement", "src": "5365:33:19" }, { "expression": { "id": 12036, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "delete", "prefix": true, "src": "5408:41:19", "subExpression": { "baseExpression": { "baseExpression": { "id": 12031, "name": "_ownedTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11749, "src": "5415:12:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_uint256_$_t_uint256_$_$", "typeString": "mapping(address => mapping(uint256 => uint256))" } }, "id": 12033, "indexExpression": { "id": 12032, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11979, "src": "5428:4:19", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "5415:18:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12035, "indexExpression": { "id": 12034, "name": "lastTokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11985, "src": "5434:14:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "5415:34:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12037, "nodeType": "ExpressionStatement", "src": "5408:41:19" } ] }, "documentation": { "id": 11977, "nodeType": "StructuredDocumentation", "src": "3875:606:19", "text": " @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\n while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\n gas optimizations e.g. when performing a transfer operation (avoiding double writes).\n This has O(1) time complexity, but alters the order of the _ownedTokens array.\n @param from address representing the previous owner of the given token ID\n @param tokenId uint256 ID of the token to be removed from the tokens list of the given address" }, "id": 12039, "implemented": true, "kind": "function", "modifiers": [], "name": "_removeTokenFromOwnerEnumeration", "nameLocation": "4495:32:19", "nodeType": "FunctionDefinition", "parameters": { "id": 11982, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 11979, "mutability": "mutable", "name": "from", "nameLocation": "4536:4:19", "nodeType": "VariableDeclaration", "scope": 12039, "src": "4528:12:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 11978, "name": "address", "nodeType": "ElementaryTypeName", "src": "4528:7:19", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 11981, "mutability": "mutable", "name": "tokenId", "nameLocation": "4550:7:19", "nodeType": "VariableDeclaration", "scope": 12039, "src": "4542:15:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 11980, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4542:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4527:31:19" }, "returnParameters": { "id": 11983, "nodeType": "ParameterList", "parameters": [], "src": "4567:0:19" }, "scope": 12088, "src": "4486:970:19", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" }, { "body": { "id": 12086, "nodeType": "Block", "src": "5815:990:19", "statements": [ { "assignments": [ 12046 ], "declarations": [ { "constant": false, "id": 12046, "mutability": "mutable", "name": "lastTokenIndex", "nameLocation": "6001:14:19", "nodeType": "VariableDeclaration", "scope": 12086, "src": "5993:22:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12045, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5993:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 12051, "initialValue": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 12050, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "expression": { "id": 12047, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "6018:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 12048, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "6029:6:19", "memberName": "length", "nodeType": "MemberAccess", "src": "6018:17:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "hexValue": "31", "id": 12049, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "6038:1:19", "typeDescriptions": { "typeIdentifier": "t_rational_1_by_1", "typeString": "int_const 1" }, "value": "1" }, "src": "6018:21:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "5993:46:19" }, { "assignments": [ 12053 ], "declarations": [ { "constant": false, "id": 12053, "mutability": "mutable", "name": "tokenIndex", "nameLocation": "6057:10:19", "nodeType": "VariableDeclaration", "scope": 12086, "src": "6049:18:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12052, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6049:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 12057, "initialValue": { "baseExpression": { "id": 12054, "name": "_allTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11760, "src": "6070:15:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12056, "indexExpression": { "id": 12055, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12042, "src": "6086:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "6070:24:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "6049:45:19" }, { "assignments": [ 12059 ], "declarations": [ { "constant": false, "id": 12059, "mutability": "mutable", "name": "lastTokenId", "nameLocation": "6424:11:19", "nodeType": "VariableDeclaration", "scope": 12086, "src": "6416:19:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12058, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6416:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 12063, "initialValue": { "baseExpression": { "id": 12060, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "6438:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 12062, "indexExpression": { "id": 12061, "name": "lastTokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12046, "src": "6449:14:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "6438:26:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "6416:48:19" }, { "expression": { "id": 12068, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 12064, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "6475:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 12066, "indexExpression": { "id": 12065, "name": "tokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12053, "src": "6486:10:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "6475:22:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 12067, "name": "lastTokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12059, "src": "6500:11:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6475:36:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 12069, "nodeType": "ExpressionStatement", "src": "6475:36:19" }, { "expression": { "id": 12074, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 12070, "name": "_allTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11760, "src": "6579:15:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12072, "indexExpression": { "id": 12071, "name": "lastTokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12059, "src": "6595:11:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "6579:28:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 12073, "name": "tokenIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12053, "src": "6610:10:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6579:41:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 12075, "nodeType": "ExpressionStatement", "src": "6579:41:19" }, { "expression": { "id": 12079, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "delete", "prefix": true, "src": "6741:31:19", "subExpression": { "baseExpression": { "id": 12076, "name": "_allTokensIndex", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11760, "src": "6748:15:19", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_uint256_$", "typeString": "mapping(uint256 => uint256)" } }, "id": 12078, "indexExpression": { "id": 12077, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 12042, "src": "6764:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "6748:24:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12080, "nodeType": "ExpressionStatement", "src": "6741:31:19" }, { "expression": { "arguments": [], "expression": { "argumentTypes": [], "expression": { "id": 12081, "name": "_allTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11756, "src": "6782:10:19", "typeDescriptions": { "typeIdentifier": "t_array$_t_uint256_$dyn_storage", "typeString": "uint256[] storage ref" } }, "id": 12083, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberLocation": "6793:3:19", "memberName": "pop", "nodeType": "MemberAccess", "src": "6782:14:19", "typeDescriptions": { "typeIdentifier": "t_function_arraypop_nonpayable$_t_array$_t_uint256_$dyn_storage_ptr_$returns$__$attached_to$_t_array$_t_uint256_$dyn_storage_ptr_$", "typeString": "function (uint256[] storage pointer)" } }, "id": 12084, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6782:16:19", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 12085, "nodeType": "ExpressionStatement", "src": "6782:16:19" } ] }, "documentation": { "id": 12040, "nodeType": "StructuredDocumentation", "src": "5462:277:19", "text": " @dev Private function to remove a token from this extension's token tracking data structures.\n This has O(1) time complexity, but alters the order of the _allTokens array.\n @param tokenId uint256 ID of the token to be removed from the tokens list" }, "id": 12087, "implemented": true, "kind": "function", "modifiers": [], "name": "_removeTokenFromAllTokensEnumeration", "nameLocation": "5753:36:19", "nodeType": "FunctionDefinition", "parameters": { "id": 12043, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 12042, "mutability": "mutable", "name": "tokenId", "nameLocation": "5798:7:19", "nodeType": "VariableDeclaration", "scope": 12087, "src": "5790:15:19", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 12041, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5790:7:19", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5789:17:19" }, "returnParameters": { "id": 12044, "nodeType": "ParameterList", "parameters": [], "src": "5815:0:19" }, "scope": 12088, "src": "5744:1061:19", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" } ], "scope": 12089, "src": "412:6395:19", "usedErrors": [] } ], "src": "128:6680:19" }, "bytecode": "", "bytecodeSha1": "da39a3ee5e6b4b0d3255bfef95601890afd80709", "compiler": { "evm_version": "istanbul", "optimizer": { "enabled": true, "runs": 200 }, "version": "0.8.19+commit.7dd6d404" }, "contractName": "ERC721Enumerable", "coverageMap": { "branches": {}, "statements": {} }, "dependencies": [ "OpenZeppelin/openzeppelin-contracts@4.8.2/Context", "OpenZeppelin/openzeppelin-contracts@4.8.2/ERC165", "OpenZeppelin/openzeppelin-contracts@4.8.2/ERC721", "OpenZeppelin/openzeppelin-contracts@4.8.2/IERC165", "OpenZeppelin/openzeppelin-contracts@4.8.2/IERC721", "OpenZeppelin/openzeppelin-contracts@4.8.2/IERC721Enumerable", "OpenZeppelin/openzeppelin-contracts@4.8.2/IERC721Metadata" ], "deployedBytecode": "", "deployedSourceMap": "", "language": "Solidity", "natspec": { "details": "This implements an optional extension of {ERC721} defined in the EIP that adds enumerability of all the token ids in the contract as well as all token ids owned by each account.", "events": { "Approval(address,address,uint256)": { "details": "Emitted when `owner` enables `approved` to manage the `tokenId` token." }, "ApprovalForAll(address,address,bool)": { "details": "Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets." }, "Transfer(address,address,uint256)": { "details": "Emitted when `tokenId` token is transferred from `from` to `to`." } }, "kind": "dev", "methods": { "approve(address,uint256)": { "details": "See {IERC721-approve}." }, "balanceOf(address)": { "details": "See {IERC721-balanceOf}." }, "getApproved(uint256)": { "details": "See {IERC721-getApproved}." }, "isApprovedForAll(address,address)": { "details": "See {IERC721-isApprovedForAll}." }, "name()": { "details": "See {IERC721Metadata-name}." }, "ownerOf(uint256)": { "details": "See {IERC721-ownerOf}." }, "safeTransferFrom(address,address,uint256)": { "details": "See {IERC721-safeTransferFrom}." }, "safeTransferFrom(address,address,uint256,bytes)": { "details": "See {IERC721-safeTransferFrom}." }, "setApprovalForAll(address,bool)": { "details": "See {IERC721-setApprovalForAll}." }, "supportsInterface(bytes4)": { "details": "See {IERC165-supportsInterface}." }, "symbol()": { "details": "See {IERC721Metadata-symbol}." }, "tokenByIndex(uint256)": { "details": "See {IERC721Enumerable-tokenByIndex}." }, "tokenOfOwnerByIndex(address,uint256)": { "details": "See {IERC721Enumerable-tokenOfOwnerByIndex}." }, "tokenURI(uint256)": { "details": "See {IERC721Metadata-tokenURI}." }, "totalSupply()": { "details": "See {IERC721Enumerable-totalSupply}." }, "transferFrom(address,address,uint256)": { "details": "See {IERC721-transferFrom}." } }, "version": 1 }, "offset": [ 412, 6807 ], "opcodes": "", "pcMap": {}, "sha1": "a329435d8f404b2cd7315b7967c80f042d06d611", "source": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../ERC721.sol\";\nimport \"./IERC721Enumerable.sol\";\n\n/**\n * @dev This implements an optional extension of {ERC721} defined in the EIP that adds\n * enumerability of all the token ids in the contract as well as all token ids owned by each\n * account.\n */\nabstract contract ERC721Enumerable is ERC721, IERC721Enumerable {\n // Mapping from owner to list of owned token IDs\n mapping(address => mapping(uint256 => uint256)) private _ownedTokens;\n\n // Mapping from token ID to index of the owner tokens list\n mapping(uint256 => uint256) private _ownedTokensIndex;\n\n // Array with all token ids, used for enumeration\n uint256[] private _allTokens;\n\n // Mapping from token id to position in the allTokens array\n mapping(uint256 => uint256) private _allTokensIndex;\n\n /**\n * @dev See {IERC165-supportsInterface}.\n */\n function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {\n return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {\n require(index < ERC721.balanceOf(owner), \"ERC721Enumerable: owner index out of bounds\");\n return _ownedTokens[owner][index];\n }\n\n /**\n * @dev See {IERC721Enumerable-totalSupply}.\n */\n function totalSupply() public view virtual override returns (uint256) {\n return _allTokens.length;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenByIndex}.\n */\n function tokenByIndex(uint256 index) public view virtual override returns (uint256) {\n require(index < ERC721Enumerable.totalSupply(), \"ERC721Enumerable: global index out of bounds\");\n return _allTokens[index];\n }\n\n /**\n * @dev See {ERC721-_beforeTokenTransfer}.\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 firstTokenId,\n uint256 batchSize\n ) internal virtual override {\n super._beforeTokenTransfer(from, to, firstTokenId, batchSize);\n\n if (batchSize > 1) {\n // Will only trigger during construction. Batch transferring (minting) is not available afterwards.\n revert(\"ERC721Enumerable: consecutive transfers not supported\");\n }\n\n uint256 tokenId = firstTokenId;\n\n if (from == address(0)) {\n _addTokenToAllTokensEnumeration(tokenId);\n } else if (from != to) {\n _removeTokenFromOwnerEnumeration(from, tokenId);\n }\n if (to == address(0)) {\n _removeTokenFromAllTokensEnumeration(tokenId);\n } else if (to != from) {\n _addTokenToOwnerEnumeration(to, tokenId);\n }\n }\n\n /**\n * @dev Private function to add a token to this extension's ownership-tracking data structures.\n * @param to address representing the new owner of the given token ID\n * @param tokenId uint256 ID of the token to be added to the tokens list of the given address\n */\n function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {\n uint256 length = ERC721.balanceOf(to);\n _ownedTokens[to][length] = tokenId;\n _ownedTokensIndex[tokenId] = length;\n }\n\n /**\n * @dev Private function to add a token to this extension's token tracking data structures.\n * @param tokenId uint256 ID of the token to be added to the tokens list\n */\n function _addTokenToAllTokensEnumeration(uint256 tokenId) private {\n _allTokensIndex[tokenId] = _allTokens.length;\n _allTokens.push(tokenId);\n }\n\n /**\n * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that\n * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for\n * gas optimizations e.g. when performing a transfer operation (avoiding double writes).\n * This has O(1) time complexity, but alters the order of the _ownedTokens array.\n * @param from address representing the previous owner of the given token ID\n * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address\n */\n function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {\n // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and\n // then delete the last slot (swap and pop).\n\n uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;\n uint256 tokenIndex = _ownedTokensIndex[tokenId];\n\n // When the token to delete is the last token, the swap operation is unnecessary\n if (tokenIndex != lastTokenIndex) {\n uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];\n\n _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n }\n\n // This also deletes the contents at the last position of the array\n delete _ownedTokensIndex[tokenId];\n delete _ownedTokens[from][lastTokenIndex];\n }\n\n /**\n * @dev Private function to remove a token from this extension's token tracking data structures.\n * This has O(1) time complexity, but alters the order of the _allTokens array.\n * @param tokenId uint256 ID of the token to be removed from the tokens list\n */\n function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {\n // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and\n // then delete the last slot (swap and pop).\n\n uint256 lastTokenIndex = _allTokens.length - 1;\n uint256 tokenIndex = _allTokensIndex[tokenId];\n\n // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so\n // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding\n // an 'if' statement (like in _removeTokenFromOwnerEnumeration)\n uint256 lastTokenId = _allTokens[lastTokenIndex];\n\n _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token\n _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index\n\n // This also deletes the contents at the last position of the array\n delete _allTokensIndex[tokenId];\n _allTokens.pop();\n }\n}\n", "sourceMap": "", "sourcePath": "/home/vscode/.brownie/packages/OpenZeppelin/openzeppelin-contracts@4.8.2/contracts/token/ERC721/extensions/ERC721Enumerable.sol", "type": "contract" }