{ "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\":\"0.6.12+commit.27d51765\"},\"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 \"../../utils/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 virtual override returns (uint256) {\n require(owner != address(0), \"ERC721: balance query for the zero address\");\n return _holderTokens[owner].length();\n }\n\n /**\n * @dev See {IERC721-ownerOf}.\n */\n function ownerOf(uint256 tokenId) public view virtual 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 virtual override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev See {IERC721Metadata-symbol}.\n */\n function symbol() public view virtual override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev See {IERC721Metadata-tokenURI}.\n */\n function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {\n require(_exists(tokenId), \"ERC721Metadata: URI query for nonexistent token\");\n\n string memory _tokenURI = _tokenURIs[tokenId];\n string memory base = baseURI();\n\n // If there is no base URI, return the token URI.\n if (bytes(base).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(base, _tokenURI));\n }\n // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.\n return string(abi.encodePacked(base, 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 virtual returns (string memory) {\n return _baseURI;\n }\n\n /**\n * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.\n */\n function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {\n return _holderTokens[owner].at(index);\n }\n\n /**\n * @dev See {IERC721Enumerable-totalSupply}.\n */\n function totalSupply() public view virtual 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 virtual 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 = ERC721.ownerOf(tokenId);\n require(to != owner, \"ERC721: approval to current owner\");\n\n require(_msgSender() == owner || ERC721.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 virtual 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 virtual 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 virtual 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 virtual returns (bool) {\n require(_exists(tokenId), \"ERC721: operator query for nonexistent token\");\n address owner = ERC721.ownerOf(tokenId);\n return (spender == owner || getApproved(tokenId) == spender || ERC721.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 = ERC721.ownerOf(tokenId); // internal owner\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(ERC721.ownerOf(tokenId) == from, \"ERC721: transfer of token that is not own\"); // internal owner\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 /**\n * @dev Approve `to` to operate on `tokenId`\n *\n * Emits an {Approval} event.\n */\n function _approve(address to, uint256 tokenId) internal virtual {\n _tokenApprovals[tokenId] = to;\n emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner\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": { "ERC721": [ 4263 ] }, "id": 4264, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 3321, "literals": [ "solidity", ">=", "0.6", ".0", "<", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "33:31:20" }, { "absolutePath": "@openzeppelin/contracts/utils/Context.sol", "file": "../../utils/Context.sol", "id": 3322, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4842, "src": "66:33:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721.sol", "file": "./IERC721.sol", "id": 3323, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4447, "src": "100:23:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol", "file": "./IERC721Metadata.sol", "id": 3324, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4505, "src": "124:31:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol", "file": "./IERC721Enumerable.sol", "id": 3325, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4478, "src": "156:33:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol", "file": "./IERC721Receiver.sol", "id": 3326, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4523, "src": "190:31:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/introspection/ERC165.sol", "file": "../../introspection/ERC165.sol", "id": 3327, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 343, "src": "222:40:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/math/SafeMath.sol", "file": "../../math/SafeMath.sol", "id": 3328, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 938, "src": "263:33:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Address.sol", "file": "../../utils/Address.sol", "id": 3329, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 4819, "src": "297:33:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/EnumerableSet.sol", "file": "../../utils/EnumerableSet.sol", "id": 3330, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 5944, "src": "331:39:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/EnumerableMap.sol", "file": "../../utils/EnumerableMap.sol", "id": 3331, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 5452, "src": "371:39:20", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Strings.sol", "file": "../../utils/Strings.sol", "id": 3332, "nodeType": "ImportDirective", "scope": 4264, "sourceUnit": 6123, "src": "411:33:20", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 3334, "name": "Context", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4841, "src": "590:7:20", "typeDescriptions": { "typeIdentifier": "t_contract$_Context_$4841", "typeString": "contract Context" } }, "id": 3335, "nodeType": "InheritanceSpecifier", "src": "590:7:20" }, { "arguments": null, "baseName": { "contractScope": null, "id": 3336, "name": "ERC165", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 342, "src": "599:6:20", "typeDescriptions": { "typeIdentifier": "t_contract$_ERC165_$342", "typeString": "contract ERC165" } }, "id": 3337, "nodeType": "InheritanceSpecifier", "src": "599:6:20" }, { "arguments": null, "baseName": { "contractScope": null, "id": 3338, "name": "IERC721", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4446, "src": "607:7:20", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721_$4446", "typeString": "contract IERC721" } }, "id": 3339, "nodeType": "InheritanceSpecifier", "src": "607:7:20" }, { "arguments": null, "baseName": { "contractScope": null, "id": 3340, "name": "IERC721Metadata", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4504, "src": "616:15:20", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Metadata_$4504", "typeString": "contract IERC721Metadata" } }, "id": 3341, "nodeType": "InheritanceSpecifier", "src": "616:15:20" }, { "arguments": null, "baseName": { "contractScope": null, "id": 3342, "name": "IERC721Enumerable", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4477, "src": "633:17:20", "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Enumerable_$4477", "typeString": "contract IERC721Enumerable" } }, "id": 3343, "nodeType": "InheritanceSpecifier", "src": "633:17:20" } ], "contractDependencies": [ 342, 582, 4446, 4477, 4504, 4841 ], "contractKind": "contract", "documentation": { "id": 3333, "nodeType": "StructuredDocumentation", "src": "446:124:20", "text": " @title ERC721 Non-Fungible Token Standard basic implementation\n @dev see https://eips.ethereum.org/EIPS/eip-721" }, "fullyImplemented": true, "id": 4263, "linearizedBaseContracts": [ 4263, 4477, 4504, 4446, 342, 582, 4841 ], "name": "ERC721", "nodeType": "ContractDefinition", "nodes": [ { "id": 3346, "libraryName": { "contractScope": null, "id": 3344, "name": "SafeMath", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 937, "src": "663:8:20", "typeDescriptions": { "typeIdentifier": "t_contract$_SafeMath_$937", "typeString": "library SafeMath" } }, "nodeType": "UsingForDirective", "src": "657:27:20", "typeName": { "id": 3345, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "676:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "id": 3349, "libraryName": { "contractScope": null, "id": 3347, "name": "Address", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 4818, "src": "695:7:20", "typeDescriptions": { "typeIdentifier": "t_contract$_Address_$4818", "typeString": "library Address" } }, "nodeType": "UsingForDirective", "src": "689:26:20", "typeName": { "id": 3348, "name": "address", "nodeType": "ElementaryTypeName", "src": "707:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } }, { "id": 3352, "libraryName": { "contractScope": null, "id": 3350, "name": "EnumerableSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5943, "src": "726:13:20", "typeDescriptions": { "typeIdentifier": "t_contract$_EnumerableSet_$5943", "typeString": "library EnumerableSet" } }, "nodeType": "UsingForDirective", "src": "720:46:20", "typeName": { "contractScope": null, "id": 3351, "name": "EnumerableSet.UintSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5848, "src": "744:21:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$5848_storage_ptr", "typeString": "struct EnumerableSet.UintSet" } } }, { "id": 3355, "libraryName": { "contractScope": null, "id": 3353, "name": "EnumerableMap", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5451, "src": "777:13:20", "typeDescriptions": { "typeIdentifier": "t_contract$_EnumerableMap_$5451", "typeString": "library EnumerableMap" } }, "nodeType": "UsingForDirective", "src": "771:55:20", "typeName": { "contractScope": null, "id": 3354, "name": "EnumerableMap.UintToAddressMap", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5225, "src": "795:30:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$5225_storage_ptr", "typeString": "struct EnumerableMap.UintToAddressMap" } } }, { "id": 3358, "libraryName": { "contractScope": null, "id": 3356, "name": "Strings", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 6122, "src": "837:7:20", "typeDescriptions": { "typeIdentifier": "t_contract$_Strings_$6122", "typeString": "library Strings" } }, "nodeType": "UsingForDirective", "src": "831:26:20", "typeName": { "id": 3357, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "849:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, { "constant": true, "id": 3361, "mutability": "constant", "name": "_ERC721_RECEIVED", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4263, "src": "1035:53:20", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 3359, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "1035:6:20", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": { "argumentTypes": null, "hexValue": "30783135306237613032", "id": 3360, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "1078:10:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_353073666_by_1", "typeString": "int_const 353073666" }, "value": "0x150b7a02" }, "visibility": "private" }, { "constant": false, "id": 3365, "mutability": "mutable", "name": "_holderTokens", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4263, "src": "1172:64:20", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet)" }, "typeName": { "id": 3364, "keyType": { "id": 3362, "name": "address", "nodeType": "ElementaryTypeName", "src": "1181:7:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1172:42:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet)" }, "valueType": { "contractScope": null, "id": 3363, "name": "EnumerableSet.UintSet", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 5848, "src": "1192:21:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$5848_storage_ptr", "typeString": "struct EnumerableSet.UintSet" } } }, "value": null, 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"8607:55:20", "text": " @dev See {IERC721-safeTransferFrom}." }, "functionSelector": "b88d4fde", "id": 3807, "implemented": true, "kind": "function", "modifiers": [], "name": "safeTransferFrom", "nodeType": "FunctionDefinition", "overrides": { "id": 3788, "nodeType": "OverrideSpecifier", "overrides": [], "src": "8771:8:20" }, "parameters": { "id": 3787, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3780, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3807, "src": "8693:12:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3779, "name": "address", "nodeType": "ElementaryTypeName", "src": "8693:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3782, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3807, "src": "8707:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3781, "name": "address", "nodeType": "ElementaryTypeName", "src": "8707:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3784, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3807, "src": "8719:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3783, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8719:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3786, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3807, "src": "8736:18:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3785, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "8736:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "8692:63:20" }, "returnParameters": { "id": 3789, "nodeType": "ParameterList", "parameters": [], "src": "8780:0:20" }, "scope": 4263, "src": "8667:282:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 3835, "nodeType": "Block", "src": "9914:166:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3820, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3810, "src": "9934:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3821, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3812, "src": "9940:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3822, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3814, "src": "9944:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3819, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4136, "src": "9924:9:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3823, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9924:28:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3824, "nodeType": "ExpressionStatement", "src": "9924:28:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3827, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3810, "src": "9993:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3828, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3812, "src": "9999:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3829, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3814, "src": "10003:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 3830, "name": "_data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3816, "src": "10012:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } ], "id": 3826, "name": "_checkOnERC721Received", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4227, "src": "9970:22:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,address,uint256,bytes memory) returns (bool)" } }, "id": 3831, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9970:48:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e746572", "id": 3832, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10020:52:20", "subdenomination": null, "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": 3825, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "9962:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3833, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9962:111:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3834, "nodeType": "ExpressionStatement", "src": "9962:111:20" } ] }, "documentation": { "id": 3808, "nodeType": "StructuredDocumentation", "src": "8955:851:20", "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": 3836, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeTransfer", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3817, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3810, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3836, "src": "9834:12:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3809, "name": "address", "nodeType": "ElementaryTypeName", "src": "9834:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3812, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3836, "src": "9848:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3811, "name": "address", "nodeType": "ElementaryTypeName", "src": "9848:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3814, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3836, "src": "9860:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3813, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9860:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3816, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3836, "src": "9877:18:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3815, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "9877:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "9833:63:20" }, "returnParameters": { "id": 3818, "nodeType": "ParameterList", "parameters": [], "src": "9914:0:20" }, "scope": 4263, "src": "9811:269:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3849, "nodeType": "Block", "src": "10454:54:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3846, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3839, "src": "10493:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3844, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3367, "src": "10471:12:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$5225_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 3845, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "contains", "nodeType": "MemberAccess", "referencedDeclaration": 5297, "src": "10471:21:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_struct$_UintToAddressMap_$5225_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$5225_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256) view returns (bool)" } }, "id": 3847, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10471:30:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3843, "id": 3848, "nodeType": "Return", "src": "10464:37:20" } ] }, "documentation": { "id": 3837, "nodeType": "StructuredDocumentation", "src": "10086:292:20", "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": 3850, "implemented": true, "kind": "function", "modifiers": [], "name": "_exists", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3840, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3839, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3850, "src": "10400:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3838, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10400:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "10399:17:20" }, "returnParameters": { "id": 3843, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3842, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3850, "src": "10448:4:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 3841, "name": "bool", "nodeType": "ElementaryTypeName", "src": "10448:4:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "10447:6:20" }, "scope": 4263, "src": "10383:125:20", "stateMutability": "view", "virtual": true, "visibility": "internal" }, { "body": { "id": 3891, "nodeType": "Block", "src": "10765:252:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3862, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3855, "src": "10791:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3861, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3850, "src": "10783:7:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 3863, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10783:16:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a206f70657261746f7220717565727920666f72206e6f6e6578697374656e7420746f6b656e", "id": 3864, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10801:46:20", "subdenomination": null, "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": 3860, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "10775:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3865, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10775:73:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3866, "nodeType": "ExpressionStatement", "src": "10775:73:20" }, { "assignments": [ 3868 ], "declarations": [ { "constant": false, "id": 3868, "mutability": "mutable", "name": "owner", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3891, "src": "10858:13:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3867, "name": "address", "nodeType": "ElementaryTypeName", "src": "10858:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "id": 3873, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3871, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3855, "src": "10889:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 3869, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4263, "src": "10874:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$4263_$", "typeString": "type(contract ERC721)" } }, "id": 3870, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "ownerOf", "nodeType": "MemberAccess", "referencedDeclaration": 3467, "src": "10874:14:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 3872, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10874:23:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "10858:39:20" }, { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 3888, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bool", "typeString": "bool" }, "id": 3882, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3876, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3874, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3853, "src": "10915:7:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 3875, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3868, "src": "10926:5:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10915:16:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3881, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3878, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3855, "src": "10947:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3877, "name": "getApproved", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3679, "src": "10935:11:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 3879, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10935:20:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 3880, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3853, "src": "10959:7:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10935:31:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "10915:51:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "nodeType": "BinaryOperation", "operator": "||", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3885, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3868, "src": "10994:5:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3886, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3853, "src": "11001:7:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3883, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4263, "src": "10970:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$4263_$", "typeString": "type(contract ERC721)" } }, "id": 3884, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "isApprovedForAll", "nodeType": "MemberAccess", "referencedDeclaration": 3731, "src": "10970:23:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_bool_$", "typeString": "function (address,address) view returns (bool)" } }, "id": 3887, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10970:39:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "src": "10915:94:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 3889, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "10914:96:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 3859, "id": 3890, "nodeType": "Return", "src": "10907:103:20" } ] }, "documentation": { "id": 3851, "nodeType": "StructuredDocumentation", "src": "10514:147:20", "text": " @dev Returns whether `spender` is allowed to manage `tokenId`.\n Requirements:\n - `tokenId` must exist." }, "id": 3892, "implemented": true, "kind": "function", "modifiers": [], "name": "_isApprovedOrOwner", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3856, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3853, "mutability": "mutable", "name": "spender", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3892, "src": "10694:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3852, "name": "address", "nodeType": "ElementaryTypeName", "src": "10694:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3855, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3892, "src": "10711:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3854, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10711:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "10693:34:20" }, "returnParameters": { "id": 3859, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3858, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3892, "src": "10759:4:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 3857, "name": "bool", "nodeType": "ElementaryTypeName", "src": "10759:4:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "10758:6:20" }, "scope": 4263, "src": "10666:351:20", "stateMutability": "view", "virtual": true, "visibility": "internal" }, { "body": { "id": 3906, "nodeType": "Block", "src": "11413:43:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3901, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3895, "src": "11433:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3902, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3897, "src": "11437:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "hexValue": "", "id": 3903, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11446:2:20", "subdenomination": null, "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": 3900, "name": "_safeMint", "nodeType": "Identifier", "overloadedDeclarations": [ 3907, 3936 ], "referencedDeclaration": 3936, "src": "11423:9:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$__$", "typeString": "function (address,uint256,bytes memory)" } }, "id": 3904, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11423:26:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3905, "nodeType": "ExpressionStatement", "src": "11423:26:20" } ] }, "documentation": { "id": 3893, "nodeType": "StructuredDocumentation", "src": "11023:320:20", "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": 3907, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeMint", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3898, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3895, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3907, "src": "11367:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3894, "name": "address", "nodeType": "ElementaryTypeName", "src": "11367:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3897, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3907, "src": "11379:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3896, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11379:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "11366:29:20" }, "returnParameters": { "id": 3899, "nodeType": "ParameterList", "parameters": [], "src": "11413:0:20" }, "scope": 4263, "src": "11348:108:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3935, "nodeType": "Block", "src": "11762:162:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3918, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3910, "src": "11778:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3919, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3912, "src": "11782:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3917, "name": "_mint", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3995, "src": "11772:5:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 3920, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11772:18:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3921, "nodeType": "ExpressionStatement", "src": "11772:18:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3926, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "11839:1:20", "subdenomination": null, "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": 3925, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "11831:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3924, "name": "address", "nodeType": "ElementaryTypeName", "src": "11831:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3927, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11831:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 3928, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3910, "src": "11843:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3929, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3912, "src": "11847:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 3930, "name": "_data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3914, "src": "11856:5:20", "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": 3923, "name": "_checkOnERC721Received", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4227, "src": "11808:22:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$_t_bool_$", "typeString": "function (address,address,uint256,bytes memory) returns (bool)" } }, "id": 3931, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11808:54:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e746572", "id": 3932, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11864:52:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" }, "value": "ERC721: transfer to non ERC721Receiver implementer" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_1e766a06da43a53d0f4c380e06e5a342e14d5af1bf8501996c844905530ca84e", "typeString": "literal_string \"ERC721: transfer to non ERC721Receiver implementer\"" } ], "id": 3922, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "11800:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3933, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11800:117:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3934, "nodeType": "ExpressionStatement", "src": "11800:117:20" } ] }, "documentation": { "id": 3908, "nodeType": "StructuredDocumentation", "src": "11462:210:20", "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": 3936, "implemented": true, "kind": "function", "modifiers": [], "name": "_safeMint", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3915, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3910, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3936, "src": "11696:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3909, "name": "address", "nodeType": "ElementaryTypeName", "src": "11696:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3912, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3936, "src": "11708:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3911, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11708:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3914, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3936, "src": "11725:18:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 3913, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "11725:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "11695:49:20" }, "returnParameters": { "id": 3916, "nodeType": "ParameterList", "parameters": [], "src": "11762:0:20" }, "scope": 4263, "src": "11677:247:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3994, "nodeType": "Block", "src": "12307:332:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3950, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 3945, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3939, "src": "12325:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3948, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12339:1:20", "subdenomination": null, "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": 3947, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12331:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3946, "name": "address", "nodeType": "ElementaryTypeName", "src": "12331:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3949, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12331:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "12325:16:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a206d696e7420746f20746865207a65726f2061646472657373", "id": 3951, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "12343:34:20", "subdenomination": null, "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": 3944, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "12317:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3952, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12317:61:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3953, "nodeType": "ExpressionStatement", "src": "12317:61:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3958, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "12396:17:20", "subExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3956, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3941, "src": "12405:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3955, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3850, "src": "12397:7:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 3957, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12397:16:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a20746f6b656e20616c7265616479206d696e746564", "id": 3959, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "12415:30:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_2a63ce106ef95058ed21fd07c42a10f11dc5c32ac13a4e847923f7759f635d57", "typeString": "literal_string \"ERC721: token already minted\"" }, "value": "ERC721: token already minted" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_2a63ce106ef95058ed21fd07c42a10f11dc5c32ac13a4e847923f7759f635d57", "typeString": "literal_string \"ERC721: token already minted\"" } ], "id": 3954, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "12388:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3960, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12388:58:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3961, "nodeType": "ExpressionStatement", "src": "12388:58:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3965, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12486:1:20", "subdenomination": null, "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": 3964, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12478:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3963, "name": "address", "nodeType": "ElementaryTypeName", "src": "12478:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3966, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12478:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 3967, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3939, "src": "12490:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3968, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3941, "src": "12494:7:20", "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": 3962, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4262, "src": "12457:20:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3969, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12457:45:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3970, "nodeType": "ExpressionStatement", "src": "12457:45:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3975, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3941, "src": "12535:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 3971, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3365, "src": "12513:13:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 3973, "indexExpression": { "argumentTypes": null, "id": 3972, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3939, "src": "12527:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "12513:17:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$5848_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 3974, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "add", "nodeType": "MemberAccess", "referencedDeclaration": 5868, "src": "12513:21:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$5848_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$5848_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 3976, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12513:30:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3977, "nodeType": "ExpressionStatement", "src": "12513:30:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 3981, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3941, "src": "12571:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 3982, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3939, "src": "12580:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 3978, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3367, "src": "12554:12:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$5225_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 3980, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "set", "nodeType": "MemberAccess", "referencedDeclaration": 5257, "src": "12554:16:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$5225_storage_ptr_$_t_uint256_$_t_address_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$5225_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256,address) returns (bool)" } }, "id": 3983, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12554:29:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3984, "nodeType": "ExpressionStatement", "src": "12554:29:20" }, { "eventCall": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 3988, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "12616:1:20", "subdenomination": null, "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": 3987, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "12608:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3986, "name": "address", "nodeType": "ElementaryTypeName", "src": "12608:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 3989, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12608:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 3990, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3939, "src": "12620:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 3991, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3941, "src": "12624:7:20", "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": 3985, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4345, "src": "12599:8:20", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3992, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12599:33:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3993, "nodeType": "EmitStatement", "src": "12594:38:20" } ] }, "documentation": { "id": 3937, "nodeType": "StructuredDocumentation", "src": "11930:311:20", "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": 3995, "implemented": true, "kind": "function", "modifiers": [], "name": "_mint", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3942, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3939, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3995, "src": "12261:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3938, "name": "address", "nodeType": "ElementaryTypeName", "src": "12261:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 3941, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 3995, "src": "12273:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3940, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12273:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "12260:29:20" }, "returnParameters": { "id": 3943, "nodeType": "ParameterList", "parameters": [], "src": "12307:0:20" }, "scope": 4263, "src": "12246:393:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4063, "nodeType": "Block", "src": "12905:478:20", "statements": [ { "assignments": [ 4002 ], "declarations": [ { "constant": false, "id": 4002, "mutability": "mutable", "name": "owner", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4063, "src": "12915:13:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4001, "name": "address", "nodeType": "ElementaryTypeName", "src": "12915:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" } ], "id": 4007, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4005, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "12946:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 4003, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4263, "src": "12931:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$4263_$", "typeString": "type(contract ERC721)" } }, "id": 4004, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "ownerOf", "nodeType": "MemberAccess", "referencedDeclaration": 3467, "src": "12931:14:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 4006, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12931:23:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "12915:39:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4009, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4002, "src": "13004:5:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 4012, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13019:1:20", "subdenomination": null, "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": 4011, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13011:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4010, "name": "address", "nodeType": "ElementaryTypeName", "src": "13011:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4013, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13011:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 4014, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13023:7:20", "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": 4008, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4262, "src": "12983:20:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 4015, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "12983:48:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4016, "nodeType": "ExpressionStatement", "src": "12983:48:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 4020, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13086:1:20", "subdenomination": null, "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": 4019, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13078:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4018, "name": "address", "nodeType": "ElementaryTypeName", "src": "13078:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4021, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13078:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 4022, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13090:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 4017, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4251, "src": "13069:8:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 4023, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13069:29:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4024, "nodeType": "ExpressionStatement", "src": "13069:29:20" }, { "condition": { "argumentTypes": null, "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 4033, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4027, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3385, "src": "13154:10:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 4029, "indexExpression": { "argumentTypes": null, "id": 4028, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13165:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13154:19:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } ], "id": 4026, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13148:5:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes_storage_ptr_$", "typeString": "type(bytes storage pointer)" }, "typeName": { "id": 4025, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "13148:5:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4030, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13148:26:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes storage pointer" } }, "id": 4031, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "length", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "13148:33:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "hexValue": "30", "id": 4032, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13185:1:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "13148:38:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 4040, "nodeType": "IfStatement", "src": "13144:95:20", "trueBody": { "id": 4039, "nodeType": "Block", "src": "13188:51:20", "statements": [ { "expression": { "argumentTypes": null, "id": 4037, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "delete", "prefix": true, "src": "13202:26:20", "subExpression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4034, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3385, "src": "13209:10:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 4036, "indexExpression": { "argumentTypes": null, "id": 4035, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13220:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "13209:19:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4038, "nodeType": "ExpressionStatement", "src": "13202:26:20" } ] } }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4045, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13277:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4041, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3365, "src": "13249:13:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 4043, "indexExpression": { "argumentTypes": null, "id": 4042, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4002, "src": "13263:5:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "13249:20:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintSet_$5848_storage", "typeString": "struct EnumerableSet.UintSet storage ref" } }, "id": 4044, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "remove", "nodeType": "MemberAccess", "referencedDeclaration": 5888, "src": "13249:27:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintSet_$5848_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintSet_$5848_storage_ptr_$", "typeString": "function (struct EnumerableSet.UintSet storage pointer,uint256) returns (bool)" } }, "id": 4046, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13249:36:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4047, "nodeType": "ExpressionStatement", "src": "13249:36:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4051, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13316:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 4048, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3367, "src": "13296:12:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$5225_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 4050, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "remove", "nodeType": "MemberAccess", "referencedDeclaration": 5277, "src": "13296:19:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$5225_storage_ptr_$_t_uint256_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$5225_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256) returns (bool)" } }, "id": 4052, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13296:28:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4053, "nodeType": "ExpressionStatement", "src": "13296:28:20" }, { "eventCall": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4055, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4002, "src": "13349:5:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 4058, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13364:1:20", "subdenomination": null, "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": 4057, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13356:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4056, "name": "address", "nodeType": "ElementaryTypeName", "src": "13356:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4059, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13356:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 4060, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3998, "src": "13368:7:20", "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": 4054, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4345, "src": "13340:8:20", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 4061, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13340:36:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4062, "nodeType": "EmitStatement", "src": "13335:41:20" } ] }, "documentation": { "id": 3996, "nodeType": "StructuredDocumentation", "src": "12645:206:20", "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": 4064, "implemented": true, "kind": "function", "modifiers": [], "name": "_burn", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 3999, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3998, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4064, "src": "12871:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3997, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12871:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "12870:17:20" }, "returnParameters": { "id": 4000, "nodeType": "ParameterList", "parameters": [], "src": "12905:0:20" }, "scope": 4263, "src": "12856:527:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4135, "nodeType": "Block", "src": "13786:505:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 4080, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4077, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "13819:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 4075, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4263, "src": "13804:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$4263_$", "typeString": "type(contract ERC721)" } }, "id": 4076, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "ownerOf", "nodeType": "MemberAccess", "referencedDeclaration": 3467, "src": "13804:14:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 4078, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13804:23:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 4079, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4067, "src": "13831:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "13804:31:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a207472616e73666572206f6620746f6b656e2074686174206973206e6f74206f776e", "id": 4081, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "13837:43:20", "subdenomination": null, "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": 4074, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "13796:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 4082, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13796:85:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4083, "nodeType": "ExpressionStatement", "src": "13796:85:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 4090, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 4085, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4069, "src": "13917:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 4088, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "13931:1:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 4087, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "13923:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4086, "name": "address", "nodeType": "ElementaryTypeName", "src": "13923:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4089, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13923:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, "src": "13917:16:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732313a207472616e7366657220746f20746865207a65726f2061646472657373", "id": 4091, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "13935:38:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_stringliteral_455fea98ea03c32d7dd1a6f1426917d80529bf47b3ccbde74e7206e889e709f4", "typeString": "literal_string \"ERC721: transfer to the zero address\"" }, "value": "ERC721: transfer to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_455fea98ea03c32d7dd1a6f1426917d80529bf47b3ccbde74e7206e889e709f4", "typeString": "literal_string \"ERC721: transfer to the zero address\"" } ], "id": 4084, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "13909:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 4092, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13909:65:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4093, "nodeType": "ExpressionStatement", "src": "13909:65:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4095, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4067, "src": "14006:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4096, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4069, "src": "14012:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4097, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14016:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 4094, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4262, "src": "13985:20:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 4098, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "13985:39:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4099, "nodeType": "ExpressionStatement", "src": "13985:39:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "hexValue": "30", "id": 4103, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "14103:1:20", "subdenomination": null, "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": 4102, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "14095:7:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 4101, "name": "address", "nodeType": "ElementaryTypeName", "src": "14095:7:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } }, "id": 4104, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14095:10:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 4105, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14107:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address_payable", "typeString": "address payable" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 4100, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4251, "src": "14086:8:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,uint256)" } }, "id": 4106, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14086:29:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4107, "nodeType": "ExpressionStatement", "src": "14086:29:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4112, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14153:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4108, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3365, "src": "14126:13:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 4110, "indexExpression": { "argumentTypes": null, "id": 4109, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4067, "src": "14140:4:20", "typeDescriptions": { 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"tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4114, "nodeType": "ExpressionStatement", "src": "14126:35:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4119, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14193:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4115, "name": "_holderTokens", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3365, "src": "14171:13:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_struct$_UintSet_$5848_storage_$", "typeString": "mapping(address => struct EnumerableSet.UintSet storage ref)" } }, "id": 4117, 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(bool)" } }, "id": 4120, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14171:30:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4121, "nodeType": "ExpressionStatement", "src": "14171:30:20" }, { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4125, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14229:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 4126, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4069, "src": "14238:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "expression": { "argumentTypes": null, "id": 4122, "name": "_tokenOwners", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3367, "src": "14212:12:20", "typeDescriptions": { "typeIdentifier": "t_struct$_UintToAddressMap_$5225_storage", "typeString": "struct EnumerableMap.UintToAddressMap storage ref" } }, "id": 4124, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "memberName": "set", "nodeType": "MemberAccess", "referencedDeclaration": 5257, "src": "14212:16:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_struct$_UintToAddressMap_$5225_storage_ptr_$_t_uint256_$_t_address_$returns$_t_bool_$bound_to$_t_struct$_UintToAddressMap_$5225_storage_ptr_$", "typeString": "function (struct EnumerableMap.UintToAddressMap storage pointer,uint256,address) returns (bool)" } }, "id": 4127, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14212:29:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 4128, "nodeType": "ExpressionStatement", "src": "14212:29:20" }, { "eventCall": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4130, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4067, "src": "14266:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4131, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4069, "src": "14272:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4132, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4071, "src": "14276:7:20", 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"nodeType": "StructuredDocumentation", "src": "13389:313:20", "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": 4136, "implemented": true, "kind": "function", "modifiers": [], "name": "_transfer", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4072, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4067, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4136, "src": "13726:12:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4066, "name": "address", "nodeType": "ElementaryTypeName", "src": "13726:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4069, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4136, "src": "13740:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4068, "name": "address", "nodeType": "ElementaryTypeName", "src": "13740:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4071, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4136, "src": "13752:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4070, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "13752:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "13725:43:20" }, "returnParameters": { "id": 4073, "nodeType": "ParameterList", "parameters": [], "src": "13786:0:20" }, "scope": 4263, "src": "13707:584:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4157, "nodeType": "Block", "src": "14519:131:20", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4146, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4139, "src": "14545:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 4145, "name": "_exists", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3850, "src": "14537:7:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_bool_$", "typeString": "function (uint256) view returns (bool)" } }, "id": 4147, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14537:16:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "argumentTypes": null, "hexValue": "4552433732314d657461646174613a2055524920736574206f66206e6f6e6578697374656e7420746f6b656e", "id": 4148, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "14555:46:20", "subdenomination": null, "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": 4144, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ -18, -18 ], "referencedDeclaration": -18, "src": "14529:7:20", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 4149, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "14529:73:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4150, "nodeType": "ExpressionStatement", "src": "14529:73:20" }, { "expression": { "argumentTypes": null, "id": 4155, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4151, "name": "_tokenURIs", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3385, "src": "14612:10:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_string_storage_$", "typeString": "mapping(uint256 => string storage ref)" } }, "id": 4153, "indexExpression": { "argumentTypes": null, "id": 4152, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4139, "src": "14623:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "14612:19:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 4154, "name": "_tokenURI", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4141, "src": "14634:9:20", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "14612:31:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 4156, "nodeType": "ExpressionStatement", "src": "14612:31:20" } ] }, "documentation": { "id": 4137, "nodeType": "StructuredDocumentation", "src": "14297:136:20", "text": " @dev Sets `_tokenURI` as the tokenURI of `tokenId`.\n Requirements:\n - `tokenId` must exist." }, "id": 4158, "implemented": true, "kind": "function", "modifiers": [], "name": "_setTokenURI", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4142, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4139, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4158, "src": "14460:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4138, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "14460:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4141, "mutability": "mutable", "name": "_tokenURI", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4158, "src": "14477:23:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 4140, "name": "string", "nodeType": "ElementaryTypeName", "src": "14477:6:20", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": null, "visibility": "internal" } ], "src": "14459:42:20" }, "returnParameters": { "id": 4143, "nodeType": "ParameterList", "parameters": [], "src": "14519:0:20" }, "scope": 4263, "src": "14438:212:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4168, "nodeType": "Block", "src": "14935:36:20", "statements": [ { "expression": { "argumentTypes": null, "id": 4166, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "id": 4164, "name": "_baseURI", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3387, "src": "14945:8:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 4165, "name": "baseURI_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4161, "src": "14956:8:20", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "14945:19:20", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 4167, "nodeType": "ExpressionStatement", "src": "14945:19:20" } ] }, "documentation": { "id": 4159, "nodeType": "StructuredDocumentation", "src": "14656:212:20", "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": 4169, "implemented": true, "kind": "function", "modifiers": [], "name": "_setBaseURI", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4162, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4161, "mutability": "mutable", "name": "baseURI_", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4169, "src": "14894:22:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 4160, "name": "string", "nodeType": "ElementaryTypeName", "src": "14894:6:20", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "value": null, "visibility": "internal" } ], "src": "14893:24:20" }, "returnParameters": { "id": 4163, "nodeType": "ParameterList", "parameters": [], "src": "14935:0:20" }, "scope": 4263, "src": "14873:98:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4226, "nodeType": "Block", "src": "15654:459:20", "statements": [ { "condition": { "argumentTypes": null, "id": 4186, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "UnaryOperation", "operator": "!", "prefix": true, "src": "15668:16:20", "subExpression": { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "expression": { "argumentTypes": null, "id": 4183, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4174, "src": "15669:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 4184, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "isContract", "nodeType": "MemberAccess", "referencedDeclaration": 4542, "src": "15669:13:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$returns$_t_bool_$bound_to$_t_address_$", "typeString": "function (address) view returns (bool)" } }, "id": 4185, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15669:15:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 4190, "nodeType": "IfStatement", "src": "15664:58:20", "trueBody": { "id": 4189, "nodeType": "Block", "src": "15686:36:20", "statements": [ { "expression": { "argumentTypes": null, "hexValue": "74727565", "id": 4187, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "15707:4:20", "subdenomination": null, "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 4182, "id": 4188, "nodeType": "Return", "src": "15700:11:20" } ] } }, { "assignments": [ 4192 ], "declarations": [ { "constant": false, "id": 4192, "mutability": "mutable", "name": "returndata", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4226, "src": "15731:23:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 4191, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "15731:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "id": 4210, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "expression": { "argumentTypes": null, "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4198, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4174, "src": "15825:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 4197, "name": "IERC721Receiver", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4522, "src": "15809:15:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_IERC721Receiver_$4522_$", "typeString": "type(contract IERC721Receiver)" } }, "id": 4199, "isConstant": false, "isLValue": false, "isPure": false, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15809:19:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_contract$_IERC721Receiver_$4522", "typeString": "contract IERC721Receiver" } }, "id": 4200, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "onERC721Received", "nodeType": "MemberAccess", "referencedDeclaration": 4521, "src": "15809:36:20", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$_t_bytes_memory_ptr_$returns$_t_bytes4_$", "typeString": "function (address,address,uint256,bytes memory) external returns (bytes4)" } }, "id": 4201, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "selector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "15809:45:20", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, { "argumentTypes": null, "arguments": [], "expression": { "argumentTypes": [], "id": 4202, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4829, "src": "15868:10:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_payable_$", "typeString": "function () view returns (address payable)" } }, "id": 4203, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15868:12:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address_payable", "typeString": "address payable" } }, { "argumentTypes": null, "id": 4204, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4172, "src": "15894:4:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4205, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4176, "src": "15912:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, { "argumentTypes": null, "id": 4206, "name": "_data", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4178, "src": "15933:5:20", "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": { "argumentTypes": null, "id": 4195, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "15773:3:20", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 4196, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "encodeWithSelector", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "15773:22:20", "typeDescriptions": { "typeIdentifier": "t_function_abiencodewithselector_pure$_t_bytes4_$returns$_t_bytes_memory_ptr_$", "typeString": "function (bytes4) pure returns (bytes memory)" } }, "id": 4207, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15773:175:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "hexValue": "4552433732313a207472616e7366657220746f206e6f6e20455243373231526563656976657220696d706c656d656e746572", "id": 4208, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "15950:52:20", "subdenomination": null, "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": { "argumentTypes": null, "id": 4193, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4174, "src": "15757:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 4194, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "functionCall", "nodeType": "MemberAccess", "referencedDeclaration": 4613, "src": "15757:15:20", "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": 4209, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "15757:246:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, "nodeType": "VariableDeclarationStatement", "src": "15731:272:20" }, { "assignments": [ 4212 ], "declarations": [ { "constant": false, "id": 4212, "mutability": "mutable", "name": "retval", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4226, "src": "16013:13:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "typeName": { "id": 4211, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "16013:6:20", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "value": null, "visibility": "internal" } ], "id": 4220, "initialValue": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4215, "name": "returndata", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4192, "src": "16040:10:20", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes memory" } }, { "argumentTypes": null, "components": [ { "argumentTypes": null, "id": 4217, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "16053:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_bytes4_$", "typeString": "type(bytes4)" }, "typeName": { "id": 4216, "name": "bytes4", "nodeType": "ElementaryTypeName", "src": "16053:6:20", "typeDescriptions": { "typeIdentifier": null, "typeString": null } } } ], "id": 4218, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "TupleExpression", "src": "16052:8:20", "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": { "argumentTypes": null, "id": 4213, "name": "abi", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": -1, "src": "16029:3:20", "typeDescriptions": { "typeIdentifier": "t_magic_abi", "typeString": "abi" } }, "id": 4214, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "decode", "nodeType": "MemberAccess", "referencedDeclaration": null, "src": "16029:10:20", "typeDescriptions": { "typeIdentifier": "t_function_abidecode_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 4219, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "16029:32:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "nodeType": "VariableDeclarationStatement", "src": "16013:48:20" }, { "expression": { "argumentTypes": null, "components": [ { "argumentTypes": null, "commonType": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" }, "id": 4223, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "argumentTypes": null, "id": 4221, "name": "retval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4212, "src": "16079:6:20", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "nodeType": "BinaryOperation", "operator": "==", "rightExpression": { "argumentTypes": null, "id": 4222, "name": "_ERC721_RECEIVED", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3361, "src": "16089:16:20", "typeDescriptions": { "typeIdentifier": "t_bytes4", "typeString": "bytes4" } }, "src": "16079:26:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "id": 4224, "isConstant": false, "isInlineArray": false, "isLValue": false, "isPure": false, "lValueRequested": false, "nodeType": "TupleExpression", "src": "16078:28:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "functionReturnParameters": 4182, "id": 4225, "nodeType": "Return", "src": "16071:35:20" } ] }, "documentation": { "id": 4170, "nodeType": "StructuredDocumentation", "src": "14977:542:20", "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": 4227, "implemented": true, "kind": "function", "modifiers": [], "name": "_checkOnERC721Received", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4179, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4172, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4227, "src": "15556:12:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4171, "name": "address", "nodeType": "ElementaryTypeName", "src": "15556:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4174, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4227, "src": "15570:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4173, "name": "address", "nodeType": "ElementaryTypeName", "src": "15570:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4176, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4227, "src": "15582:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4175, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "15582:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4178, "mutability": "mutable", "name": "_data", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4227, "src": "15599:18:20", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_bytes_memory_ptr", "typeString": "bytes" }, "typeName": { "id": 4177, "name": "bytes", "nodeType": "ElementaryTypeName", "src": "15599:5:20", "typeDescriptions": { "typeIdentifier": "t_bytes_storage_ptr", "typeString": "bytes" } }, "value": null, "visibility": "internal" } ], "src": "15555:63:20" }, "returnParameters": { "id": 4182, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4181, "mutability": "mutable", "name": "", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4227, "src": "15644:4:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 4180, "name": "bool", "nodeType": "ElementaryTypeName", "src": "15644:4:20", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "15643:6:20" }, "scope": 4263, "src": "15524:589:20", "stateMutability": "nonpayable", "virtual": false, "visibility": "private" }, { "body": { "id": 4250, "nodeType": "Block", "src": "16289:125:20", "statements": [ { "expression": { "argumentTypes": null, "id": 4239, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "argumentTypes": null, "baseExpression": { "argumentTypes": null, "id": 4235, "name": "_tokenApprovals", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3371, "src": "16299:15:20", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_uint256_$_t_address_$", "typeString": "mapping(uint256 => address)" } }, "id": 4237, "indexExpression": { "argumentTypes": null, "id": 4236, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4232, "src": "16315:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "16299:24:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "argumentTypes": null, "id": 4238, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4230, "src": "16326:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "16299:29:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "id": 4240, "nodeType": "ExpressionStatement", "src": "16299:29:20" }, { "eventCall": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 4244, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4232, "src": "16367:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 4242, "name": "ERC721", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4263, "src": "16352:6:20", "typeDescriptions": { "typeIdentifier": "t_type$_t_contract$_ERC721_$4263_$", "typeString": "type(contract ERC721)" } }, "id": 4243, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "ownerOf", "nodeType": "MemberAccess", "referencedDeclaration": 3467, "src": "16352:14:20", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_uint256_$returns$_t_address_$", "typeString": "function (uint256) view returns (address)" } }, "id": 4245, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "16352:23:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4246, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4230, "src": "16377:2:20", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 4247, "name": "tokenId", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4232, "src": "16381:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 4241, "name": "Approval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4354, "src": "16343:8:20", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 4248, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "16343:46:20", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 4249, "nodeType": "EmitStatement", "src": "16338:51:20" } ] }, "documentation": { "id": 4228, "nodeType": "StructuredDocumentation", "src": "16119:101:20", "text": " @dev Approve `to` to operate on `tokenId`\n Emits an {Approval} event." }, "id": 4251, "implemented": true, "kind": "function", "modifiers": [], "name": "_approve", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4233, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4230, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4251, "src": "16243:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4229, "name": "address", "nodeType": "ElementaryTypeName", "src": "16243:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4232, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4251, "src": "16255:15:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 4231, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "16255:7:20", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "value": null, "visibility": "internal" } ], "src": "16242:29:20" }, "returnParameters": { "id": 4234, "nodeType": "ParameterList", "parameters": [], "src": "16289:0:20" }, "scope": 4263, "src": "16225:189:20", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 4261, "nodeType": "Block", "src": "17100:3:20", "statements": [] }, "documentation": { "id": 4252, "nodeType": "StructuredDocumentation", "src": "16420:585:20", "text": " @dev Hook that is called before any token transfer. 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": 4262, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nodeType": "FunctionDefinition", "overrides": null, "parameters": { "id": 4259, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 4254, "mutability": "mutable", "name": "from", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4262, "src": "17040:12:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4253, "name": "address", "nodeType": "ElementaryTypeName", "src": "17040:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4256, "mutability": "mutable", "name": "to", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4262, "src": "17054:10:20", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 4255, "name": "address", "nodeType": "ElementaryTypeName", "src": "17054:7:20", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "value": null, "visibility": "internal" }, { "constant": false, "id": 4258, "mutability": "mutable", "name": "tokenId", "nodeType": "VariableDeclaration", "overrides": null, "scope": 4262, "src": "17066:15:20", "stateVariable": false, 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{xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is\n forwarded in {IERC721Receiver-onERC721Received} to contract recipients." }, "id": 3908, "name": "StructuredDocumentation", "src": "11462:210:20" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "to", "overrides": null, "scope": 3936, "stateVariable": false, "storageLocation": "default", "type": "address", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "name": "address", "stateMutability": "nonpayable", "type": "address" }, "id": 3909, "name": "ElementaryTypeName", "src": "11696:7:20" } ], "id": 3910, "name": "VariableDeclaration", "src": "11696:10:20" }, { "attributes": { "constant": false, "mutability": "mutable", "name": "tokenId", "overrides": null, "scope": 3936, "stateVariable": false, "storageLocation": "default", "type": "uint256", "value": null, "visibility": "internal" }, "children": [ { "attributes": { 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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": 4159, "name": "StructuredDocumentation", "src": "14656:212:20" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "baseURI_", "overrides": null, "scope": 4169, "stateVariable": false, "storageLocation": "memory", "type": "string", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "name": "string", "type": "string" }, "id": 4160, "name": "ElementaryTypeName", "src": "14894:6:20" } ], "id": 4161, "name": "VariableDeclaration", "src": "14894:22:20" } ], "id": 4162, "name": "ParameterList", "src": "14893:24:20" }, { "attributes": { "parameters": [ null ] }, "children": [], "id": 4163, "name": "ParameterList", "src": "14935:0:20" }, { "children": [ { "children": [ { "attributes": { "argumentTypes": null, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "operator": 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{ "attributes": { "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": 4170, "name": "StructuredDocumentation", "src": "14977:542:20" }, { "children": [ { "attributes": { "constant": false, "mutability": "mutable", "name": "from", "overrides": null, "scope": 4227, "stateVariable": false, "storageLocation": "default", "type": "address", "value": null, "visibility": "internal" }, "children": [ { "attributes": { "name": "address", "stateMutability": "nonpayable", "type": "address" }, "id": 4171, "name": "ElementaryTypeName", "src": 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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 } }