{ "contractName": "ERC721", "abi": [ { "inputs": [ { "internalType": "string", "name": "name_", "type": "string" }, { "internalType": "string", "name": "symbol_", "type": "string" } ], "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "approved", "type": "address" }, { "indexed": true, "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "owner", "type": "address" }, { "indexed": true, "internalType": "address", "name": "operator", "type": "address" }, { "indexed": false, "internalType": "bool", "name": "approved", "type": "bool" } ], "name": "ApprovalForAll", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": true, "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "inputs": [ { "internalType": "bytes4", "name": "interfaceId", "type": "bytes4" } ], "name": "supportsInterface", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "ownerOf", "outputs": [ { "internalType": "address", "name": "", "type": "address" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "name", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "symbol", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "tokenURI", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "baseURI", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "uint256", "name": "index", "type": "uint256" } ], "name": "tokenOfOwnerByIndex", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "totalSupply", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "index", "type": "uint256" } ], "name": "tokenByIndex", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "approve", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "getApproved", "outputs": [ { "internalType": "address", "name": "", "type": "address" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "operator", "type": "address" }, { "internalType": "bool", "name": "approved", "type": "bool" } ], "name": "setApprovalForAll", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "operator", "type": "address" } ], "name": "isApprovedForAll", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "transferFrom", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "tokenId", "type": "uint256" } ], "name": "safeTransferFrom", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "tokenId", "type": "uint256" }, { "internalType": "bytes", "name": "_data", "type": "bytes" } ], "name": "safeTransferFrom", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.7.6+commit.7338295f\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"string\",\"name\":\"name_\",\"type\":\"string\"},{\"internalType\":\"string\",\"name\":\"symbol_\",\"type\":\"string\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"approved\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"ApprovalForAll\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"baseURI\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"getApproved\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"}],\"name\":\"isApprovedForAll\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"ownerOf\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"},{\"internalType\":\"bytes\",\"name\":\"_data\",\"type\":\"bytes\"}],\"name\":\"safeTransferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"operator\",\"type\":\"address\"},{\"internalType\":\"bool\",\"name\":\"approved\",\"type\":\"bool\"}],\"name\":\"setApprovalForAll\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes4\",\"name\":\"interfaceId\",\"type\":\"bytes4\"}],\"name\":\"supportsInterface\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"index\",\"type\":\"uint256\"}],\"name\":\"tokenByIndex\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"index\",\"type\":\"uint256\"}],\"name\":\"tokenOfOwnerByIndex\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"tokenURI\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"tokenId\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"see https://eips.ethereum.org/EIPS/eip-721\",\"kind\":\"dev\",\"methods\":{\"approve(address,uint256)\":{\"details\":\"See {IERC721-approve}.\"},\"balanceOf(address)\":{\"details\":\"See {IERC721-balanceOf}.\"},\"baseURI()\":{\"details\":\"Returns the base URI set via {_setBaseURI}. This will be automatically added as a prefix in {tokenURI} to each token's URI, or to the token ID if no specific URI is set for that token ID.\"},\"constructor\":{\"details\":\"Initializes the contract by setting a `name` and a `symbol` to the token collection.\"},\"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}. Time complexity O(1), guaranteed to always use less than 30 000 gas.\"},\"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}.\"}},\"title\":\"ERC721 Non-Fungible Token Standard basic 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"source": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"../../GSN/Context.sol\";\nimport \"./IERC721.sol\";\nimport \"./IERC721Metadata.sol\";\nimport \"./IERC721Enumerable.sol\";\nimport \"./IERC721Receiver.sol\";\nimport \"../../introspection/ERC165.sol\";\nimport \"../../math/SafeMath.sol\";\nimport \"../../utils/Address.sol\";\nimport \"../../utils/EnumerableSet.sol\";\nimport \"../../utils/EnumerableMap.sol\";\nimport \"../../utils/Strings.sol\";\n\n/**\n * @title ERC721 Non-Fungible Token Standard basic implementation\n * @dev see https://eips.ethereum.org/EIPS/eip-721\n */\ncontract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {\n using SafeMath for uint256;\n using Address for address;\n using EnumerableSet for EnumerableSet.UintSet;\n using EnumerableMap for EnumerableMap.UintToAddressMap;\n using Strings for uint256;\n\n // Equals to `bytes4(keccak256(\"onERC721Received(address,address,uint256,bytes)\"))`\n // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`\n bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;\n\n // Mapping from holder address to their (enumerable) set of owned tokens\n mapping (address => EnumerableSet.UintSet) private _holderTokens;\n\n // Enumerable mapping from token ids to their owners\n EnumerableMap.UintToAddressMap private _tokenOwners;\n\n // Mapping from token ID to approved address\n mapping (uint256 => address) private _tokenApprovals;\n\n // Mapping from owner to operator approvals\n mapping (address => mapping (address => bool)) private _operatorApprovals;\n\n // Token name\n string private _name;\n\n // Token symbol\n string private _symbol;\n\n // Optional mapping for token URIs\n mapping (uint256 => string) private _tokenURIs;\n\n // Base URI\n string private _baseURI;\n\n /*\n * bytes4(keccak256('balanceOf(address)')) == 0x70a08231\n * bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e\n * bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3\n * bytes4(keccak256('getApproved(uint256)')) == 0x081812fc\n * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465\n * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5\n * bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd\n * bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e\n * bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde\n *\n * => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^\n * 0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd\n */\n bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;\n\n /*\n * bytes4(keccak256('name()')) == 0x06fdde03\n * bytes4(keccak256('symbol()')) == 0x95d89b41\n * bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd\n *\n * => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f\n */\n bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;\n\n /*\n * bytes4(keccak256('totalSupply()')) == 0x18160ddd\n * bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59\n * bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7\n *\n * => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63\n */\n bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;\n\n /**\n * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.\n */\n constructor (string memory name_, string memory symbol_) public {\n _name = name_;\n _symbol = symbol_;\n\n // register the supported interfaces to conform to ERC721 via ERC165\n _registerInterface(_INTERFACE_ID_ERC721);\n _registerInterface(_INTERFACE_ID_ERC721_METADATA);\n _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);\n }\n\n /**\n * @dev See {IERC721-balanceOf}.\n */\n function balanceOf(address owner) public view override returns (uint256) {\n require(owner != address(0), \"ERC721: balance query for the zero address\");\n\n return _holderTokens[owner].length();\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view override returns (address) {\n return _tokenOwners.get(tokenId, \"ERC721: owner query for nonexistent token\");\n }\n\n /**\n * @dev See {IERC721Metadata-name}.\n */\n function name() public view override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev See {IERC721Metadata-symbol}.\n */\n function symbol() public view override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev See {IERC721Metadata-tokenURI}.\n */\n function tokenURI(uint256 tokenId) public view override returns (string memory) {\n require(_exists(tokenId), \"ERC721Metadata: URI query for nonexistent token\");\n\n string memory _tokenURI = _tokenURIs[tokenId];\n\n // If there is no base URI, return the token URI.\n if (bytes(_baseURI).length == 0) {\n return _tokenURI;\n }\n // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).\n if (bytes(_tokenURI).length > 0) {\n return string(abi.encodePacked(_baseURI, _tokenURI));\n }\n // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.\n return string(abi.encodePacked(_baseURI, tokenId.toString()));\n }\n\n /**\n * @dev Returns the base URI set via {_setBaseURI}. This will be\n * automatically added as a prefix in {tokenURI} to each token's URI, or\n * to the token ID if no specific URI is set for that token ID.\n */\n function baseURI() public view returns (string memory) {\n return _baseURI;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {\n return _holderTokens[owner].at(index);\n }\n\n /**\n * @dev See {IERC721Enumerable-totalSupply}.\n */\n function totalSupply() public view override returns (uint256) {\n // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds\n return _tokenOwners.length();\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenByIndex}.\n */\n function tokenByIndex(uint256 index) public view override returns (uint256) {\n (uint256 tokenId, ) = _tokenOwners.at(index);\n return tokenId;\n }\n\n /**\n * @dev See {IERC721-approve}.\n */\n function approve(address to, uint256 tokenId) public virtual override {\n address owner = ownerOf(tokenId);\n require(to != owner, \"ERC721: approval to current owner\");\n\n require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),\n \"ERC721: approve caller is not owner nor approved for all\"\n );\n\n _approve(to, tokenId);\n }\n\n /**\n * @dev See {IERC721-getApproved}.\n */\n function getApproved(uint256 tokenId) public view override returns (address) {\n require(_exists(tokenId), \"ERC721: approved query for nonexistent token\");\n\n return _tokenApprovals[tokenId];\n }\n\n /**\n * @dev See {IERC721-setApprovalForAll}.\n */\n function setApprovalForAll(address operator, bool approved) public virtual override {\n require(operator != _msgSender(), \"ERC721: approve to caller\");\n\n _operatorApprovals[_msgSender()][operator] = approved;\n emit ApprovalForAll(_msgSender(), operator, approved);\n }\n\n /**\n * @dev See {IERC721-isApprovedForAll}.\n */\n function isApprovedForAll(address owner, address operator) public view override returns (bool) {\n return _operatorApprovals[owner][operator];\n }\n\n /**\n * @dev See {IERC721-transferFrom}.\n */\n function transferFrom(address from, address to, uint256 tokenId) public virtual override {\n //solhint-disable-next-line max-line-length\n require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n\n _transfer(from, to, tokenId);\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {\n safeTransferFrom(from, to, tokenId, \"\");\n }\n\n /**\n * @dev See {IERC721-safeTransferFrom}.\n */\n function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {\n require(_isApprovedOrOwner(_msgSender(), tokenId), \"ERC721: transfer caller is not owner nor approved\");\n _safeTransfer(from, to, tokenId, _data);\n }\n\n /**\n * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n * are aware of the ERC721 protocol to prevent tokens from being forever locked.\n *\n * `_data` is additional data, it has no specified format and it is sent in call to `to`.\n *\n * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n * implement alternative mechanisms to perform token transfer, such as signature-based.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `tokenId` token must exist and be owned by `from`.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {\n _transfer(from, to, tokenId);\n require(_checkOnERC721Received(from, to, tokenId, _data), \"ERC721: transfer to non ERC721Receiver implementer\");\n }\n\n /**\n * @dev Returns whether `tokenId` exists.\n *\n * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\n *\n * Tokens start existing when they are minted (`_mint`),\n * and stop existing when they are burned (`_burn`).\n */\n function _exists(uint256 tokenId) internal view returns (bool) {\n return _tokenOwners.contains(tokenId);\n }\n\n /**\n * @dev Returns whether `spender` is allowed to manage `tokenId`.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {\n require(_exists(tokenId), \"ERC721: operator query for nonexistent token\");\n address owner = ownerOf(tokenId);\n return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));\n }\n\n /**\n * @dev Safely mints `tokenId` and transfers it to `to`.\n *\n * Requirements:\n d*\n * - `tokenId` must not exist.\n * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n *\n * Emits a {Transfer} event.\n */\n function _safeMint(address to, uint256 tokenId) internal virtual {\n _safeMint(to, tokenId, \"\");\n }\n\n /**\n * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.\n */\n function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {\n _mint(to, tokenId);\n require(_checkOnERC721Received(address(0), to, tokenId, _data), \"ERC721: transfer to non ERC721Receiver implementer\");\n }\n\n /**\n * @dev Mints `tokenId` and transfers it to `to`.\n *\n * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n *\n * Requirements:\n *\n * - `tokenId` must not exist.\n * - `to` cannot be the zero address.\n *\n * Emits a {Transfer} event.\n */\n function _mint(address to, uint256 tokenId) internal virtual {\n require(to != address(0), \"ERC721: mint to the zero address\");\n require(!_exists(tokenId), \"ERC721: token already minted\");\n\n _beforeTokenTransfer(address(0), to, tokenId);\n\n _holderTokens[to].add(tokenId);\n\n _tokenOwners.set(tokenId, to);\n\n emit Transfer(address(0), to, tokenId);\n }\n\n /**\n * @dev Destroys `tokenId`.\n * The approval is cleared when the token is burned.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n *\n * Emits a {Transfer} event.\n */\n function _burn(uint256 tokenId) internal virtual {\n address owner = ownerOf(tokenId);\n\n _beforeTokenTransfer(owner, address(0), tokenId);\n\n // Clear approvals\n _approve(address(0), tokenId);\n\n // Clear metadata (if any)\n if (bytes(_tokenURIs[tokenId]).length != 0) {\n delete _tokenURIs[tokenId];\n }\n\n _holderTokens[owner].remove(tokenId);\n\n _tokenOwners.remove(tokenId);\n\n emit Transfer(owner, address(0), tokenId);\n }\n\n /**\n * @dev Transfers `tokenId` from `from` to `to`.\n * As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - `tokenId` token must be owned by `from`.\n *\n * Emits a {Transfer} event.\n */\n function _transfer(address from, address to, uint256 tokenId) internal virtual {\n require(ownerOf(tokenId) == from, \"ERC721: transfer of token that is not own\");\n require(to != address(0), \"ERC721: transfer to the zero address\");\n\n _beforeTokenTransfer(from, to, tokenId);\n\n // Clear approvals from the previous owner\n _approve(address(0), tokenId);\n\n _holderTokens[from].remove(tokenId);\n _holderTokens[to].add(tokenId);\n\n _tokenOwners.set(tokenId, to);\n\n emit Transfer(from, to, tokenId);\n }\n\n /**\n * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.\n *\n * Requirements:\n *\n * - `tokenId` must exist.\n */\n function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {\n require(_exists(tokenId), \"ERC721Metadata: URI set of nonexistent token\");\n _tokenURIs[tokenId] = _tokenURI;\n }\n\n /**\n * @dev Internal function to set the base URI for all token IDs. It is\n * automatically added as a prefix to the value returned in {tokenURI},\n * or to the token ID if {tokenURI} is empty.\n */\n function _setBaseURI(string memory baseURI_) internal virtual {\n _baseURI = baseURI_;\n }\n\n /**\n * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\n * The call is not executed if the target address is not a contract.\n *\n * @param from address representing the previous owner of the given token ID\n * @param to target address that will receive the tokens\n * @param tokenId uint256 ID of the token to be transferred\n * @param _data bytes optional data to send along with the call\n * @return bool whether the call correctly returned the expected magic value\n */\n function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)\n private returns (bool)\n {\n if (!to.isContract()) {\n return true;\n }\n bytes memory returndata = to.functionCall(abi.encodeWithSelector(\n IERC721Receiver(to).onERC721Received.selector,\n _msgSender(),\n from,\n tokenId,\n _data\n ), \"ERC721: transfer to non ERC721Receiver implementer\");\n bytes4 retval = abi.decode(returndata, (bytes4));\n return (retval == _ERC721_RECEIVED);\n }\n\n function _approve(address to, uint256 tokenId) private {\n _tokenApprovals[tokenId] = to;\n emit Approval(ownerOf(tokenId), to, tokenId);\n }\n\n /**\n * @dev Hook that is called before any token transfer. This includes minting\n * and burning.\n *\n * Calling conditions:\n *\n * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\n * transferred to `to`.\n * - When `from` is zero, `tokenId` will be minted for `to`.\n * - When `to` is zero, ``from``'s `tokenId` will be burned.\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }\n}\n", "sourcePath": "@openzeppelin/contracts/token/ERC721/ERC721.sol", "ast": { "absolutePath": "@openzeppelin/contracts/token/ERC721/ERC721.sol", "exportedSymbols": { "Address": [ 6821 ], "Context": [ 4324 ], "ERC165": [ 4381 ], "ERC721": [ 6358 ], "EnumerableMap": [ 7276 ], "EnumerableSet": [ 7756 ], "IERC165": [ 4393 ], "IERC721": [ 6501 ], "IERC721Enumerable": [ 6532 ], "IERC721Metadata": [ 6559 ], "IERC721Receiver": [ 6577 ], "SafeMath": [ 4589 ], "Strings": [ 7843 ] }, "id": 6359, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 5429, "literals": [ "solidity", ">=", "0.6", ".0", "<", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:31:28" }, { "absolutePath": "@openzeppelin/contracts/GSN/Context.sol", "file": "../../GSN/Context.sol", "id": 5430, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 4325, "src": "66:31:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721.sol", "file": "./IERC721.sol", "id": 5431, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 6502, "src": "98:23:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol", "file": "./IERC721Metadata.sol", "id": 5432, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 6560, "src": "122:31:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol", "file": "./IERC721Enumerable.sol", "id": 5433, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 6533, "src": "154:33:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol", "file": "./IERC721Receiver.sol", "id": 5434, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 6578, "src": "188:31:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/introspection/ERC165.sol", "file": "../../introspection/ERC165.sol", "id": 5435, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 4382, "src": "220:40:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 5436, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 4590, "src": "261:33:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 5437, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 6822, "src": "295:33:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/EnumerableSet.sol", "file": "../../utils/EnumerableSet.sol", "id": 5438, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 7757, "src": "329:39:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/EnumerableMap.sol", "file": "../../utils/EnumerableMap.sol", "id": 5439, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 7277, "src": "369:39:28", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Strings.sol", "file": "../../utils/Strings.sol", "id": 5440, "nodeType": "ImportDirective", "scope": 6359, "sourceUnit": 7844, "src": "409:33:28", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "baseName": { "id": 5442, "name": "Context", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4324, "src": "588:7:28", "typeDescriptions": { "typeIdentifier": "t_contract$_Context_$4324", "typeString": "contract Context" } }, "id": 5443, "nodeType": "InheritanceSpecifier", "src": "588:7:28" }, { "baseName": { "id": 5444, "name": "ERC165", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4381, "src": "597:6:28", "typeDescriptions": { "typeIdentifier": "t_contract$_ERC165_$4381", "typeString": "contract ERC165" } }, "id": 5445, "nodeType": "InheritanceSpecifier", "src": "597:6:28" }, { "baseName": { "id": 5446, "name": "IERC721", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6501, "src": "605:7:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721_$6501", "typeString": "contract IERC721" } }, "id": 5447, "nodeType": "InheritanceSpecifier", "src": "605:7:28" }, { "baseName": { "id": 5448, "name": "IERC721Metadata", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6559, "src": "614:15:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Metadata_$6559", "typeString": "contract IERC721Metadata" } }, "id": 5449, "nodeType": "InheritanceSpecifier", "src": "614:15:28" }, { "baseName": { "id": 5450, "name": "IERC721Enumerable", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6532, "src": "631:17:28", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Enumerable_$6532", "typeString": "contract IERC721Enumerable" } }, "id": 5451, "nodeType": "InheritanceSpecifier", "src": "631:17:28" } ], "contractDependencies": [ 4324, 4381, 4393, 6501, 6532, 6559 ], "contractKind": "contract", "documentation": { "id": 5441, "nodeType": "StructuredDocumentation", "src": "444:124:28", "text": " @title ERC721 Non-Fungible Token Standard basic implementation\n @dev see https://eips.ethereum.org/EIPS/eip-721" }, "fullyImplemented": true, "id": 6358, "linearizedBaseContracts": [ 6358, 6532, 6559, 6501, 4381, 4393, 4324 ], "name": "ERC721", "nodeType": "ContractDefinition", "nodes": [ { "id": 5454, "libraryName": { "id": 5452, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4589, "src": "661:8:28", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$4589", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "655:27:28", "typeName": { "id": 5453, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "674:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 5457, "libraryName": { "id": 5455, "name": "Address", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6821, "src": "693:7:28", "typeDescriptions": { "typeIdentifier": "t_contract$_Address_$6821", "typeString": "library Address" } }, "nodeType": "UsingForDirective", "src": "687:26:28", "typeName": { "id": 5456, "name": "address", "nodeType": "ElementaryTypeName", "src": "705:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "id": 5460, "libraryName": { "id": 5458, "name": "EnumerableSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7756, "src": "724:13:28", "typeDescriptions": { "typeIdentifier": "t_contract$_EnumerableSet_$7756", "typeString": "library EnumerableSet" } }, "nodeType": "UsingForDirective", "src": "718:46:28", "typeName": { "id": 5459, "name": "EnumerableSet.UintSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7661, "src": "742:21:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage_ptr", "typeString": "struct EnumerableSet.UintSet" } } }, { "id": 5463, "libraryName": { "id": 5461, "name": "EnumerableMap", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7276, "src": "775:13:28", "typeDescriptions": { "typeIdentifier": "t_contract$_EnumerableMap_$7276", "typeString": "library EnumerableMap" } }, "nodeType": "UsingForDirective", "src": "769:55:28", "typeName": { "id": 5462, "name": "EnumerableMap.UintToAddressMap", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7101, "src": "793:30:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$7101_storage_ptr", "typeString": "struct EnumerableMap.UintToAddressMap" } } }, { "id": 5466, "libraryName": { "id": 5464, "name": "Strings", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7843, "src": "835:7:28", "typeDescriptions": { "typeIdentifier": "t_contract$_Strings_$7843", "typeString": "library Strings" } }, "nodeType": "UsingForDirective", "src": "829:26:28", "typeName": { "id": 5465, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "847:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "constant": true, "id": 5469, "mutability": "constant", "name": "_ERC721_RECEIVED", "nodeType": "VariableDeclaration", "scope": 6358, "src": "1033:53:28", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 5467, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "1033:6:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": { "hexValue": "30783135306237613032", "id": 5468, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1076:10:28", "typeDescriptions": { "typeIdentifier": "t_rational_353073666_by_1", "typeString": "int_const 353073666" }, "value": "0x150b7a02" }, "visibility": "private" }, { "constant": false, "id": 5473, "mutability": "mutable", "name": "_holderTokens", "nodeType": "VariableDeclaration", "scope": 6358, "src": "1170:64:28", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet)" }, "typeName": { "id": 5472, "keyType": { "id": 5470, "name": "address", "nodeType": "ElementaryTypeName", "src": "1179:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1170:42:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet)" }, "valueType": { "id": 5471, "name": "EnumerableSet.UintSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 7661, "src": "1190:21:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage_ptr", "typeString": "struct EnumerableSet.UintSet" } } }, "visibility": "private" }, { "constant": false, "id": 5475, "mutability": "mutable", "name": "_tokenOwners", "nodeType": "VariableDeclaration", "scope": 6358, "src": "1298:51:28", "stateVariable": true, "storageLocation": "default", 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transfer to non ERC721Receiver implementer\"" }, "value": "ERC721: transfer to non ERC721Receiver implementer" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" } ], "id": 5926, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9831:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 5934, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9831:111:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 5935, "nodeType": "ExpressionStatement", "src": "9831:111:28" } ] }, "documentation": { "id": 5909, "nodeType": "StructuredDocumentation", "src": "8824:851:28", "text": " @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients\n are aware of the ERC721 protocol to prevent tokens from being forever locked.\n `_data` is additional data, it has no specified format and it is sent in call to `to`.\n This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.\n implement alternative mechanisms to perform token transfer, such as signature-based.\n Requirements:\n - `from` cannot be the zero address.\n - `to` cannot be the zero address.\n - `tokenId` token must exist and be owned by `from`.\n - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n Emits a {Transfer} event." }, "id": 5937, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeTransfer", "nodeType": "FunctionDefinition", "parameters": { "id": 5918, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5911, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "scope": 5937, "src": "9703:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5910, "name": "address", "nodeType": "ElementaryTypeName", "src": "9703:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 5913, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 5937, "src": "9717:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5912, "name": "address", "nodeType": "ElementaryTypeName", "src": "9717:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 5915, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 5937, "src": "9729:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5914, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9729:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" }, { "constant": false, "id": 5917, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "scope": 5937, "src": "9746:18:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 5916, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "9746:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "visibility": "internal" } ], "src": "9702:63:28" }, "returnParameters": { "id": 5919, "nodeType": "ParameterList", "parameters": [], "src": "9783:0:28" }, "scope": 6358, "src": "9680:269:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 5950, "nodeType": "Block", "src": "10315:54:28", "statements": [ { "expression": { "arguments": [ { "id": 5947, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5940, "src": "10354:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 5945, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5475, "src": "10332:12:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$7101_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 5946, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "contains", "nodeType": "MemberAccess", "referencedDeclaration": 7170, "src": "10332:21:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_struct$_UintToAddressMap_$7101_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$7101_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256) view returns (bool)" } }, "id": 5948, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10332:30:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 5944, "id": 5949, "nodeType": "Return", "src": "10325:37:28" } ] }, "documentation": { "id": 5938, "nodeType": "StructuredDocumentation", "src": "9955:292:28", "text": " @dev Returns whether `tokenId` exists.\n Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.\n Tokens start existing when they are minted (`_mint`),\n and stop existing when they are burned (`_burn`)." }, "id": 5951, "implemented": true, "kind": "function", "modifiers": [], "name": "_exists", "nodeType": "FunctionDefinition", "parameters": { "id": 5941, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5940, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 5951, "src": "10269:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5939, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10269:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10268:17:28" }, "returnParameters": { "id": 5944, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5943, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "scope": 5951, "src": "10309:4:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 5942, "name": "bool", "nodeType": "ElementaryTypeName", "src": "10309:4:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "10308:6:28" }, "scope": 6358, "src": "10252:117:28", "stateMutability": "view", "virtual": false, "visibility": "internal" }, { "body": { "id": 5990, "nodeType": "Block", "src": "10618:238:28", "statements": [ { "expression": { "arguments": [ { "arguments": [ { "id": 5963, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5956, "src": "10644:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 5962, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5951, "src": "10636:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 5964, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10636:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a206f70657261746f7220717565727920666f72206e6f6e6578697374656e7420746f6b656e", "id": 5965, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10654:46:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_5797d1ccb08b83980dd0c07ea40d8f6a64d35fff736a19bdd17522954cb0899c", "typeString": "literal_string \"ERC721: operator query for nonexistent token\"" }, "value": "ERC721: operator query for nonexistent token" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_5797d1ccb08b83980dd0c07ea40d8f6a64d35fff736a19bdd17522954cb0899c", "typeString": "literal_string \"ERC721: operator query for nonexistent token\"" } ], "id": 5961, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10628:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 5966, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10628:73:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 5967, "nodeType": "ExpressionStatement", "src": "10628:73:28" }, { "assignments": [ 5969 ], "declarations": [ { "constant": false, "id": 5969, "mutability": "mutable", "name": "owner", "nodeType": "VariableDeclaration", "scope": 5990, "src": "10711:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5968, "name": "address", "nodeType": "ElementaryTypeName", "src": "10711:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 5973, "initialValue": { "arguments": [ { "id": 5971, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5956, "src": "10735:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 5970, "name": "ownerOf", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5575, "src": "10727:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 5972, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10727:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "10711:32:28" }, { "expression": { "components": [ { "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 5987, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 5982, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 5976, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 5974, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5954, "src": "10761:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "id": 5975, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5969, "src": "10772:5:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10761:16:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 5981, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 5978, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5956, "src": "10793:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 5977, "name": "getApproved", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5780, "src": "10781:11:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 5979, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10781:20:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "id": 5980, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5954, "src": "10805:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10781:31:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "10761:51:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "arguments": [ { "id": 5984, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5969, "src": "10833:5:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 5985, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5954, "src": "10840:7:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 5983, "name": "isApprovedForAll", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5832, "src": "10816:16:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_bool_$", "typeString": "function (address,address) view returns (bool)" } }, "id": 5986, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10816:32:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "10761:87:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 5988, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "10760:89:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 5960, "id": 5989, "nodeType": "Return", "src": "10753:96:28" } ] }, "documentation": { "id": 5952, "nodeType": "StructuredDocumentation", "src": "10375:147:28", "text": " @dev Returns whether `spender` is allowed to manage `tokenId`.\n Requirements:\n - `tokenId` must exist." }, "id": 5991, "implemented": true, "kind": "function", "modifiers": [], "name": "_isApprovedOrOwner", "nodeType": "FunctionDefinition", "parameters": { "id": 5957, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5954, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "scope": 5991, "src": "10555:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5953, "name": "address", "nodeType": "ElementaryTypeName", "src": "10555:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 5956, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 5991, "src": "10572:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5955, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10572:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10554:34:28" }, "returnParameters": { "id": 5960, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5959, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "scope": 5991, "src": "10612:4:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 5958, "name": "bool", "nodeType": "ElementaryTypeName", "src": "10612:4:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "10611:6:28" }, "scope": 6358, "src": "10527:329:28", "stateMutability": "view", "virtual": false, "visibility": "internal" }, { "body": { "id": 6005, "nodeType": "Block", "src": "11252:43:28", "statements": [ { "expression": { "arguments": [ { "id": 6000, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5994, "src": "11272:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6001, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5996, "src": "11276:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "hexValue": "", "id": 6002, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11285:2:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470", "typeString": "literal_string \"\"" }, "value": "" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_stringliteral_c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470", "typeString": "literal_string \"\"" } ], "id": 5999, "name": "_safeMint", "nodeType": "Identifier", "overloadedDeclarations": [ 6006, 6035 ], "referencedDeclaration": 6035, "src": "11262:9:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (address,uint256,bytes memory)" } }, "id": 6003, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11262:26:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6004, "nodeType": "ExpressionStatement", "src": "11262:26:28" } ] }, "documentation": { "id": 5992, "nodeType": "StructuredDocumentation", "src": "10862:320:28", "text": " @dev Safely mints `tokenId` and transfers it to `to`.\n Requirements:\nd*\n - `tokenId` must not exist.\n - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.\n Emits a {Transfer} event." }, "id": 6006, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeMint", "nodeType": "FunctionDefinition", "parameters": { "id": 5997, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 5994, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 6006, "src": "11206:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 5993, "name": "address", "nodeType": "ElementaryTypeName", "src": "11206:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 5996, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6006, "src": "11218:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 5995, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11218:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "11205:29:28" }, "returnParameters": { "id": 5998, "nodeType": "ParameterList", "parameters": [], "src": "11252:0:28" }, "scope": 6358, "src": "11187:108:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6034, "nodeType": "Block", "src": "11601:162:28", "statements": [ { "expression": { "arguments": [ { "id": 6017, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6009, "src": "11617:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6018, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6011, "src": "11621:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6016, "name": "_mint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6094, "src": "11611:5:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 6019, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11611:18:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6020, "nodeType": "ExpressionStatement", "src": "11611:18:28" }, { "expression": { "arguments": [ { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 6025, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "11678:1:28", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 6024, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "11670:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6023, "name": "address", "nodeType": "ElementaryTypeName", "src": "11670:7:28", "typeDescriptions": {} } }, "id": 6026, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11670:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6027, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6009, "src": "11682:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6028, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6011, "src": "11686:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 6029, "name": "_data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6013, "src": "11695:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 6022, "name": "_checkOnERC721Received", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6324, "src": "11647:22:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,address,uint256,bytes memory) returns (bool)" } }, "id": 6030, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11647:54:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e746572", "id": 6031, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11703:52:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" }, "value": "ERC721: transfer to non ERC721Receiver implementer" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" } ], "id": 6021, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "11639:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6032, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11639:117:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6033, "nodeType": "ExpressionStatement", "src": "11639:117:28" } ] }, "documentation": { "id": 6007, "nodeType": "StructuredDocumentation", "src": "11301:210:28", "text": " @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n forwarded in {IERC721Receiver-onERC721Received} to contract recipients." }, "id": 6035, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeMint", "nodeType": "FunctionDefinition", "parameters": { "id": 6014, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6009, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 6035, "src": "11535:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6008, "name": "address", "nodeType": "ElementaryTypeName", "src": "11535:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6011, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6035, "src": "11547:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6010, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11547:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" }, { "constant": false, "id": 6013, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "scope": 6035, "src": "11564:18:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 6012, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "11564:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "visibility": "internal" } ], "src": "11534:49:28" }, "returnParameters": { "id": 6015, "nodeType": "ParameterList", "parameters": [], "src": "11601:0:28" }, "scope": 6358, "src": "11516:247:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6093, "nodeType": "Block", "src": "12146:332:28", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 6049, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 6044, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6038, "src": "12164:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 6047, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12178:1:28", "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": 6046, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12170:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6045, "name": "address", "nodeType": "ElementaryTypeName", "src": "12170:7:28", "typeDescriptions": {} } }, "id": 6048, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12170:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "12164:16:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a206d696e7420746f20746865207a65726f2061646472657373", "id": 6050, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "12182:34:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_8a66f4bb6512ffbfcc3db9b42318eb65f26ac15163eaa9a1e5cfa7bee9d1c7c6", "typeString": "literal_string \"ERC721: mint to the zero address\"" }, "value": "ERC721: mint to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_8a66f4bb6512ffbfcc3db9b42318eb65f26ac15163eaa9a1e5cfa7bee9d1c7c6", "typeString": "literal_string \"ERC721: mint to the zero address\"" } ], "id": 6043, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "12156:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6051, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12156:61:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6052, "nodeType": "ExpressionStatement", "src": "12156:61:28" }, { "expression": { "arguments": [ { "id": 6057, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "12235:17:28", "subExpression": { "arguments": [ { "id": 6055, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6040, "src": "12244:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6054, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5951, "src": "12236:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 6056, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12236:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a20746f6b656e20616c7265616479206d696e746564", "id": 6058, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "12254:30:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_2a63ce106ef95058ed21fd07c42a10f11dc5c32ac13a4e847923f7759f635d57", "typeString": "literal_string \"ERC721: token already minted\"" }, "value": "ERC721: token already minted" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_2a63ce106ef95058ed21fd07c42a10f11dc5c32ac13a4e847923f7759f635d57", "typeString": "literal_string \"ERC721: token already minted\"" } ], "id": 6053, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "12227:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6059, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12227:58:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6060, "nodeType": "ExpressionStatement", "src": "12227:58:28" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 6064, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12325:1:28", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 6063, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12317:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6062, "name": "address", "nodeType": "ElementaryTypeName", "src": "12317:7:28", "typeDescriptions": {} } }, "id": 6065, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12317:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6066, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6038, "src": "12329:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6067, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6040, "src": "12333:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6061, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6357, "src": "12296:20:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6068, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12296:45:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6069, "nodeType": "ExpressionStatement", "src": "12296:45:28" }, { "expression": { "arguments": [ { "id": 6074, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6040, "src": "12374:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "baseExpression": { "id": 6070, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5473, "src": "12352:13:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 6072, "indexExpression": { "id": 6071, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6038, "src": "12366:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "12352:17:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 6073, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 7681, "src": "12352:21:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$7661_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$7661_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 6075, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12352:30:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6076, "nodeType": "ExpressionStatement", "src": "12352:30:28" }, { "expression": { "arguments": [ { "id": 6080, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6040, "src": "12410:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 6081, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6038, "src": "12419:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 6077, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5475, "src": "12393:12:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$7101_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 6079, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "set", "nodeType": "MemberAccess", "referencedDeclaration": 7130, "src": "12393:16:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$7101_storage_ptr_$_t_uint256_$_t_address_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$7101_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256,address) returns (bool)" } }, "id": 6082, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12393:29:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6083, "nodeType": "ExpressionStatement", "src": "12393:29:28" }, { "eventCall": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 6087, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12455:1:28", "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": 6086, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12447:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6085, "name": "address", "nodeType": "ElementaryTypeName", "src": "12447:7:28", "typeDescriptions": {} } }, "id": 6088, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12447:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6089, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6038, "src": "12459:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6090, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6040, "src": "12463:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6084, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6400, "src": "12438:8:28", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6091, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12438:33:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6092, "nodeType": "EmitStatement", "src": "12433:38:28" } ] }, "documentation": { "id": 6036, "nodeType": "StructuredDocumentation", "src": "11769:311:28", "text": " @dev Mints `tokenId` and transfers it to `to`.\n WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible\n Requirements:\n - `tokenId` must not exist.\n - `to` cannot be the zero address.\n Emits a {Transfer} event." }, "id": 6094, "implemented": true, "kind": "function", "modifiers": [], "name": "_mint", "nodeType": "FunctionDefinition", "parameters": { "id": 6041, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6038, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 6094, "src": "12100:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6037, "name": "address", "nodeType": "ElementaryTypeName", "src": "12100:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6040, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6094, "src": "12112:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6039, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12112:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "12099:29:28" }, "returnParameters": { "id": 6042, "nodeType": "ParameterList", "parameters": [], "src": "12146:0:28" }, "scope": 6358, "src": "12085:393:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6161, "nodeType": "Block", "src": "12744:453:28", "statements": [ { "assignments": [ 6101 ], "declarations": [ { "constant": false, "id": 6101, "mutability": "mutable", "name": "owner", "nodeType": "VariableDeclaration", "scope": 6161, "src": "12754:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6100, "name": "address", "nodeType": "ElementaryTypeName", "src": "12754:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 6105, "initialValue": { "arguments": [ { "id": 6103, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "12778:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6102, "name": "ownerOf", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5575, "src": "12770:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 6104, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12770:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "12754:32:28" }, { "expression": { "arguments": [ { "id": 6107, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6101, "src": "12818:5:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 6110, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12833:1:28", "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": 6109, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12825:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6108, "name": "address", "nodeType": "ElementaryTypeName", "src": "12825:7:28", "typeDescriptions": {} } }, "id": 6111, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12825:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6112, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "12837:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6106, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6357, "src": "12797:20:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6113, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12797:48:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6114, "nodeType": "ExpressionStatement", "src": "12797:48:28" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 6118, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12900:1:28", "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": 6117, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12892:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6116, "name": "address", "nodeType": "ElementaryTypeName", "src": "12892:7:28", "typeDescriptions": {} } }, "id": 6119, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12892:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6120, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "12904:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6115, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6346, "src": "12883:8:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 6121, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12883:29:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6122, "nodeType": "ExpressionStatement", "src": "12883:29:28" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 6131, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "expression": { "arguments": [ { "baseExpression": { "id": 6125, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5493, "src": "12968:10:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 6127, "indexExpression": { "id": 6126, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "12979:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "12968:19:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } ], "id": 6124, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12962:5:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes_storage_ptr_$", "typeString": "type(bytes storage pointer)" }, "typeName": { "id": 6123, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "12962:5:28", "typeDescriptions": {} } }, "id": 6128, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12962:26:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes storage pointer" } }, "id": 6129, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "src": "12962:33:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "hexValue": "30", "id": 6130, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12999:1:28", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "12962:38:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6138, "nodeType": "IfStatement", "src": "12958:95:28", "trueBody": { "id": 6137, "nodeType": "Block", "src": "13002:51:28", "statements": [ { "expression": { "id": 6135, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "delete", "prefix": true, "src": "13016:26:28", "subExpression": { "baseExpression": { "id": 6132, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5493, "src": "13023:10:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 6134, "indexExpression": { "id": 6133, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "13034:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "13023:19:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6136, "nodeType": "ExpressionStatement", "src": "13016:26:28" } ] } }, { "expression": { "arguments": [ { "id": 6143, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "13091:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "baseExpression": { "id": 6139, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5473, "src": "13063:13:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 6141, "indexExpression": { "id": 6140, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6101, "src": "13077:5:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13063:20:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 6142, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "remove", "nodeType": "MemberAccess", "referencedDeclaration": 7701, "src": "13063:27:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$7661_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$7661_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 6144, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13063:36:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6145, "nodeType": "ExpressionStatement", "src": "13063:36:28" }, { "expression": { "arguments": [ { "id": 6149, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "13130:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "id": 6146, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5475, "src": "13110:12:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$7101_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 6148, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "remove", "nodeType": "MemberAccess", "referencedDeclaration": 7150, "src": "13110:19:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$7101_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$7101_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256) returns (bool)" } }, "id": 6150, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13110:28:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6151, "nodeType": "ExpressionStatement", "src": "13110:28:28" }, { "eventCall": { "arguments": [ { "id": 6153, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6101, "src": "13163:5:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 6156, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13178:1:28", "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": 6155, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13170:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6154, "name": "address", "nodeType": "ElementaryTypeName", "src": "13170:7:28", "typeDescriptions": {} } }, "id": 6157, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13170:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6158, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6097, "src": "13182:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6152, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6400, "src": "13154:8:28", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6159, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13154:36:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6160, "nodeType": "EmitStatement", "src": "13149:41:28" } ] }, "documentation": { "id": 6095, "nodeType": "StructuredDocumentation", "src": "12484:206:28", "text": " @dev Destroys `tokenId`.\n The approval is cleared when the token is burned.\n Requirements:\n - `tokenId` must exist.\n Emits a {Transfer} event." }, "id": 6162, "implemented": true, "kind": "function", "modifiers": [], "name": "_burn", "nodeType": "FunctionDefinition", "parameters": { "id": 6098, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6097, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6162, "src": "12710:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6096, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12710:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "12709:17:28" }, "returnParameters": { "id": 6099, "nodeType": "ParameterList", "parameters": [], "src": "12744:0:28" }, "scope": 6358, "src": "12695:502:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6232, "nodeType": "Block", "src": "13600:480:28", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 6177, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 6174, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "13626:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6173, "name": "ownerOf", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5575, "src": "13618:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 6175, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13618:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "id": 6176, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6165, "src": "13638:4:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "13618:24:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a207472616e73666572206f6620746f6b656e2074686174206973206e6f74206f776e", "id": 6178, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "13644:43:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_a01073130a885d6c1c1af6ac75fc3b1c4f9403c235362962bbf528e2bd87d950", "typeString": "literal_string \"ERC721: transfer of token that is not own\"" }, "value": "ERC721: transfer of token that is not own" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_a01073130a885d6c1c1af6ac75fc3b1c4f9403c235362962bbf528e2bd87d950", "typeString": "literal_string \"ERC721: transfer of token that is not own\"" } ], "id": 6172, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "13610:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6179, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13610:78:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6180, "nodeType": "ExpressionStatement", "src": "13610:78:28" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 6187, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 6182, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6167, "src": "13706:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 6185, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13720:1:28", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 6184, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13712:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6183, "name": "address", "nodeType": "ElementaryTypeName", "src": "13712:7:28", "typeDescriptions": {} } }, "id": 6186, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13712:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "13706:16:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732313a207472616e7366657220746f20746865207a65726f2061646472657373", "id": 6188, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "13724:38:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_455fea98ea03c32d7dd1a6f1426917d80529bf47b3ccbde74e7206e889e709f4", "typeString": "literal_string \"ERC721: transfer to the zero address\"" }, "value": "ERC721: transfer to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_455fea98ea03c32d7dd1a6f1426917d80529bf47b3ccbde74e7206e889e709f4", "typeString": "literal_string \"ERC721: transfer to the zero address\"" } ], "id": 6181, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "13698:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6189, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13698:65:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6190, "nodeType": "ExpressionStatement", "src": "13698:65:28" }, { "expression": { "arguments": [ { "id": 6192, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6165, "src": "13795:4:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6193, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6167, "src": "13801:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6194, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "13805:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6191, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6357, "src": "13774:20:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6195, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13774:39:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6196, "nodeType": "ExpressionStatement", "src": "13774:39:28" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 6200, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13892:1:28", "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": 6199, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13884:7:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 6198, "name": "address", "nodeType": "ElementaryTypeName", "src": "13884:7:28", "typeDescriptions": {} } }, "id": 6201, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13884:10:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6202, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "13896:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6197, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6346, "src": "13875:8:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 6203, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13875:29:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6204, "nodeType": "ExpressionStatement", "src": "13875:29:28" }, { "expression": { "arguments": [ { "id": 6209, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "13942:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "baseExpression": { "id": 6205, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5473, "src": "13915:13:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 6207, "indexExpression": { "id": 6206, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6165, "src": "13929:4:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13915:19:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 6208, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "remove", "nodeType": "MemberAccess", "referencedDeclaration": 7701, "src": "13915:26:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$7661_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$7661_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 6210, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13915:35:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6211, "nodeType": "ExpressionStatement", "src": "13915:35:28" }, { "expression": { "arguments": [ { "id": 6216, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "13982:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "baseExpression": { "id": 6212, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5473, "src": "13960:13:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$7661_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 6214, "indexExpression": { "id": 6213, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6167, "src": "13974:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13960:17:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$7661_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 6215, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 7681, "src": "13960:21:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$7661_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$7661_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 6217, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13960:30:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6218, "nodeType": "ExpressionStatement", "src": "13960:30:28" }, { "expression": { "arguments": [ { "id": 6222, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "14018:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 6223, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6167, "src": "14027:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "id": 6219, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5475, "src": "14001:12:28", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$7101_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 6221, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "set", "nodeType": "MemberAccess", "referencedDeclaration": 7130, "src": "14001:16:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$7101_storage_ptr_$_t_uint256_$_t_address_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$7101_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256,address) returns (bool)" } }, "id": 6224, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14001:29:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6225, "nodeType": "ExpressionStatement", "src": "14001:29:28" }, { "eventCall": { "arguments": [ { "id": 6227, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6165, "src": "14055:4:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6228, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6167, "src": "14061:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6229, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6169, "src": "14065:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6226, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6400, "src": "14046:8:28", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6230, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14046:27:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6231, "nodeType": "EmitStatement", "src": "14041:32:28" } ] }, "documentation": { "id": 6163, "nodeType": "StructuredDocumentation", "src": "13203:313:28", "text": " @dev Transfers `tokenId` from `from` to `to`.\n As opposed to {transferFrom}, this imposes no restrictions on msg.sender.\n Requirements:\n - `to` cannot be the zero address.\n - `tokenId` token must be owned by `from`.\n Emits a {Transfer} event." }, "id": 6233, "implemented": true, "kind": "function", "modifiers": [], "name": "_transfer", "nodeType": "FunctionDefinition", "parameters": { "id": 6170, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6165, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "scope": 6233, "src": "13540:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6164, "name": "address", "nodeType": "ElementaryTypeName", "src": "13540:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6167, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 6233, "src": "13554:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6166, "name": "address", "nodeType": "ElementaryTypeName", "src": "13554:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6169, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6233, "src": "13566:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6168, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13566:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "13539:43:28" }, "returnParameters": { "id": 6171, "nodeType": "ParameterList", "parameters": [], "src": "13600:0:28" }, "scope": 6358, "src": "13521:559:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6254, "nodeType": "Block", "src": "14308:131:28", "statements": [ { "expression": { "arguments": [ { "arguments": [ { "id": 6243, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6236, "src": "14334:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6242, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5951, "src": "14326:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 6244, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14326:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "4552433732314d657461646174613a2055524920736574206f66206e6f6e6578697374656e7420746f6b656e", "id": 6245, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "14344:46:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_94be4a260caaeac1b145f03ffa2e70bc612b64982d04f24073aaf3a5f9009978", "typeString": "literal_string \"ERC721Metadata: URI set of nonexistent token\"" }, "value": "ERC721Metadata: URI set of nonexistent token" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_94be4a260caaeac1b145f03ffa2e70bc612b64982d04f24073aaf3a5f9009978", "typeString": "literal_string \"ERC721Metadata: URI set of nonexistent token\"" } ], "id": 6241, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "14318:7:28", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 6246, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14318:73:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6247, "nodeType": "ExpressionStatement", "src": "14318:73:28" }, { "expression": { "id": 6252, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 6248, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5493, "src": "14401:10:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 6250, "indexExpression": { "id": 6249, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6236, "src": "14412:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "14401:19:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 6251, "name": "_tokenURI", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6238, "src": "14423:9:28", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "14401:31:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 6253, "nodeType": "ExpressionStatement", "src": "14401:31:28" } ] }, "documentation": { "id": 6234, "nodeType": "StructuredDocumentation", "src": "14086:136:28", "text": " @dev Sets `_tokenURI` as the tokenURI of `tokenId`.\n Requirements:\n - `tokenId` must exist." }, "id": 6255, "implemented": true, "kind": "function", "modifiers": [], "name": "_setTokenURI", "nodeType": "FunctionDefinition", "parameters": { "id": 6239, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6236, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6255, "src": "14249:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6235, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14249:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" }, { "constant": false, "id": 6238, "mutability": "mutable", "name": "_tokenURI", "nodeType": "VariableDeclaration", "scope": 6255, "src": "14266:23:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 6237, "name": "string", "nodeType": "ElementaryTypeName", "src": "14266:6:28", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "14248:42:28" }, "returnParameters": { "id": 6240, "nodeType": "ParameterList", "parameters": [], "src": "14308:0:28" }, "scope": 6358, "src": "14227:212:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6265, "nodeType": "Block", "src": "14724:36:28", "statements": [ { "expression": { "id": 6263, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 6261, "name": "_baseURI", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5495, "src": "14734:8:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 6262, "name": "baseURI_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6258, "src": "14745:8:28", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "14734:19:28", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 6264, "nodeType": "ExpressionStatement", "src": "14734:19:28" } ] }, "documentation": { "id": 6256, "nodeType": "StructuredDocumentation", "src": "14445:212:28", "text": " @dev Internal function to set the base URI for all token IDs. It is\n automatically added as a prefix to the value returned in {tokenURI},\n or to the token ID if {tokenURI} is empty." }, "id": 6266, "implemented": true, "kind": "function", "modifiers": [], "name": "_setBaseURI", "nodeType": "FunctionDefinition", "parameters": { "id": 6259, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6258, "mutability": "mutable", "name": "baseURI_", "nodeType": "VariableDeclaration", "scope": 6266, "src": "14683:22:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 6257, "name": "string", "nodeType": "ElementaryTypeName", "src": "14683:6:28", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "14682:24:28" }, "returnParameters": { "id": 6260, "nodeType": "ParameterList", "parameters": [], "src": "14724:0:28" }, "scope": 6358, "src": "14662:98:28", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 6323, "nodeType": "Block", "src": "15443:459:28", "statements": [ { "condition": { "id": 6283, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "15457:16:28", "subExpression": { "arguments": [], "expression": { "argumentTypes": [], "expression": { "id": 6280, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6271, "src": "15458:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 6281, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "isContract", "nodeType": "MemberAccess", "referencedDeclaration": 6597, "src": "15458:13:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$_t_bool_$bound_to$_t_address_$", "typeString": "function (address) view returns (bool)" } }, "id": 6282, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15458:15:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 6287, "nodeType": "IfStatement", "src": "15453:58:28", "trueBody": { "id": 6286, "nodeType": "Block", "src": "15475:36:28", "statements": [ { "expression": { "hexValue": "74727565", "id": 6284, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "15496:4:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 6279, "id": 6285, "nodeType": "Return", "src": "15489:11:28" } ] } }, { "assignments": [ 6289 ], "declarations": [ { "constant": false, "id": 6289, "mutability": "mutable", "name": "returndata", "nodeType": "VariableDeclaration", "scope": 6323, "src": "15520:23:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 6288, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "15520:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "visibility": "internal" } ], "id": 6307, "initialValue": { "arguments": [ { "arguments": [ { "expression": { "expression": { "arguments": [ { "id": 6295, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6271, "src": "15614:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 6294, "name": "IERC721Receiver", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6577, "src": "15598:15:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_IERC721Receiver_$6577_$", "typeString": "type(contract IERC721Receiver)" } }, "id": 6296, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15598:19:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Receiver_$6577", "typeString": "contract IERC721Receiver" } }, "id": 6297, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "onERC721Received", "nodeType": "MemberAccess", "referencedDeclaration": 6576, "src": "15598:36:28", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$_t_bytes4_$", "typeString": "function (address,address,uint256,bytes memory) external returns (bytes4)" } }, "id": 6298, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "src": "15598:45:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "arguments": [], "expression": { "argumentTypes": [], "id": 6299, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4312, "src": "15657:10:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_payable_$", "typeString": "function () view returns (address payable)" } }, "id": 6300, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15657:12:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "id": 6301, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6269, "src": "15683:4:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6302, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6273, "src": "15701:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "id": 6303, "name": "_data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6275, "src": "15722:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "expression": { "id": 6292, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "15562:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 6293, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "src": "15562:22:28", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 6304, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15562:175:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "hexValue": "4552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e746572", "id": 6305, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "15739:52:28", "typeDescriptions": { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" }, "value": "ERC721: transfer to non ERC721Receiver implementer" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" } ], "expression": { "id": 6290, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6271, "src": "15546:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 6291, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "functionCall", "nodeType": "MemberAccess", "referencedDeclaration": 6668, "src": "15546:15:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_bytes_memory_ptr_$_t_string_memory_ptr_$returns$_t_bytes_memory_ptr_$bound_to$_t_address_$", "typeString": "function (address,bytes memory,string memory) returns (bytes memory)" } }, "id": 6306, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15546:246:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "15520:272:28" }, { "assignments": [ 6309 ], "declarations": [ { "constant": false, "id": 6309, "mutability": "mutable", "name": "retval", "nodeType": "VariableDeclaration", "scope": 6323, "src": "15802:13:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 6308, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "15802:6:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "visibility": "internal" } ], "id": 6317, "initialValue": { "arguments": [ { "id": 6312, "name": "returndata", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6289, "src": "15829:10:28", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "components": [ { "id": 6314, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "15842:6:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" }, "typeName": { "id": 6313, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "15842:6:28", "typeDescriptions": {} } } ], "id": 6315, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "15841:8:28", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" }, { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" } ], "expression": { "id": 6310, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967295, "src": "15818:3:28", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 6311, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "decode", "nodeType": "MemberAccess", "src": "15818:10:28", "typeDescriptions": { "typeIdentifier": "t_function_abidecode_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 6316, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15818:32:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "nodeType": "VariableDeclarationStatement", "src": "15802:48:28" }, { "expression": { "components": [ { "commonType": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "id": 6320, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 6318, "name": "retval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6309, "src": "15868:6:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "id": 6319, "name": "_ERC721_RECEIVED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5469, "src": "15878:16:28", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "src": "15868:26:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 6321, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "15867:28:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 6279, "id": 6322, "nodeType": "Return", "src": "15860:35:28" } ] }, "documentation": { "id": 6267, "nodeType": "StructuredDocumentation", "src": "14766:542:28", "text": " @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.\n The call is not executed if the target address is not a contract.\n @param from address representing the previous owner of the given token ID\n @param to target address that will receive the tokens\n @param tokenId uint256 ID of the token to be transferred\n @param _data bytes optional data to send along with the call\n @return bool whether the call correctly returned the expected magic value" }, "id": 6324, "implemented": true, "kind": "function", "modifiers": [], "name": "_checkOnERC721Received", "nodeType": "FunctionDefinition", "parameters": { "id": 6276, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6269, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "scope": 6324, "src": "15345:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6268, "name": "address", "nodeType": "ElementaryTypeName", "src": "15345:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6271, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "scope": 6324, "src": "15359:10:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6270, "name": "address", "nodeType": "ElementaryTypeName", "src": "15359:7:28", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 6273, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "scope": 6324, "src": "15371:15:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 6272, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "15371:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" }, { "constant": false, "id": 6275, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "scope": 6324, "src": "15388:18:28", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 6274, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "15388:5:28", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "visibility": "internal" } ], "src": "15344:63:28" }, "returnParameters": { "id": 6279, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6278, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "scope": 6324, "src": "15433:4:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 6277, "name": "bool", "nodeType": "ElementaryTypeName", "src": "15433:4:28", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "15432:6:28" }, "scope": 6358, "src": "15313:589:28", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" }, { "body": { "id": 6345, "nodeType": "Block", "src": "15963:100:28", "statements": [ { "expression": { "id": 6335, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 6331, "name": "_tokenApprovals", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5479, "src": "15973:15:28", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_address_$", "typeString": "mapping(uint256 => address)" } }, "id": 6333, "indexExpression": { "id": 6332, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6328, "src": "15989:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "15973:24:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 6334, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6326, "src": "16000:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "15973:29:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 6336, "nodeType": "ExpressionStatement", "src": "15973:29:28" }, { "eventCall": { "arguments": [ { "arguments": [ { "id": 6339, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6328, "src": "16034:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6338, "name": "ownerOf", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 5575, "src": "16026:7:28", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 6340, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "16026:16:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6341, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6326, "src": "16044:2:28", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 6342, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6328, "src": "16048:7:28", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 6337, "name": "Approval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 6409, "src": "16017:8:28", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 6343, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "16017:39:28", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 6344, "nodeType": "EmitStatement", "src": "16012:44:28" } ] }, "id": 6346, 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This includes minting\n and burning.\n Calling conditions:\n - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\n transferred to `to`.\n - When `from` is zero, `tokenId` will be minted for `to`.\n - When `to` is zero, ``from``'s `tokenId` will be burned.\n - `from` cannot be the zero address.\n - `to` cannot be the zero address.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 6357, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nodeType": "FunctionDefinition", "parameters": { "id": 6354, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 6349, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "scope": 6357, "src": "16689:12:28", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 6348, "name": "address", "nodeType": 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This includes minting\n and burning.\n Calling conditions:\n - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be\n transferred to `to`.\n - When `from` is zero, `tokenId` will be minted for `to`.\n - When `to` is zero, ``from``'s `tokenId` will be burned.\n - `from` cannot be the zero address.\n - `to` cannot be the zero address.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 6347, "name": "StructuredDocumentation", "src": "16069:585:28" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "from", "scope": 6357, "stateVariable": false, "storageLocation": "default", "type": "address", "visibility": "internal" }, "children": [ { "attributes": { "name": "address", "stateMutability": "nonpayable", "type": "address" }, "id": 6348, "name": "ElementaryTypeName", "src": "16689:7:28" } ], "id": 6349, "name": "VariableDeclaration", "src": "16689:12:28" }, { "attributes": { "constant": false, "mutability": "mutable", "name": "to", "scope": 6357, "stateVariable": false, "storageLocation": "default", "type": "address", "visibility": "internal" }, "children": [ { "attributes": { "name": "address", "stateMutability": "nonpayable", "type": "address" }, "id": 6350, "name": "ElementaryTypeName", "src": "16703:7:28" } ], "id": 6351, "name": "VariableDeclaration", "src": "16703:10:28" }, { "attributes": { "constant": false, "mutability": "mutable", "name": "tokenId", "scope": 6357, "stateVariable": false, "storageLocation": "default", "type": "uint256", "visibility": "internal" }, "children": [ { "attributes": { "name": "uint256", "type": "uint256" }, "id": 6352, "name": "ElementaryTypeName", "src": "16715:7:28" } ], "id": 6353, "name": "VariableDeclaration", "src": "16715:15:28" } ], "id": 6354, "name": "ParameterList", "src": "16688:43:28" }, { "attributes": { "parameters": [ null ] }, "children": [], "id": 6355, "name": "ParameterList", "src": "16749:0:28" }, { "attributes": { "statements": [ null ] }, "children": [], "id": 6356, "name": "Block", "src": "16749:3:28" } ], "id": 6357, "name": "FunctionDefinition", "src": "16659:93:28" } ], "id": 6358, "name": "ContractDefinition", "src": "569:16185:28" } ], "id": 6359, "name": "SourceUnit", "src": "33:16722:28" }, "compiler": { "name": "solc", "version": "0.7.6+commit.7338295f.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.4.1", "updatedAt": "2021-06-03T23:56:22.349Z", "devdoc": { "details": "see https://eips.ethereum.org/EIPS/eip-721", "kind": "dev", "methods": { "approve(address,uint256)": { "details": "See {IERC721-approve}." }, "balanceOf(address)": { "details": "See {IERC721-balanceOf}." }, "baseURI()": { "details": "Returns the base URI set via {_setBaseURI}. This will be automatically added as a prefix in {tokenURI} to each token's URI, or to the token ID if no specific URI is set for that token ID." }, "constructor": { "details": "Initializes the contract by setting a `name` and a `symbol` to the token collection." }, "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}. Time complexity O(1), guaranteed to always use less than 30 000 gas." }, "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}." } }, "title": "ERC721 Non-Fungible Token Standard basic implementation", "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }