{ "contractName": "ERC20", "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": "spender", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "internalType": "address", "name": "from", "type": "address" }, { "indexed": true, "internalType": "address", "name": "to", "type": "address" }, { "indexed": false, "internalType": "uint256", "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "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": [], "name": "decimals", "outputs": [ { "internalType": "uint8", "name": "", "type": "uint8" } ], "stateMutability": "view", "type": "function" }, { "inputs": [], "name": "totalSupply", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "account", "type": "address" } ], "name": "balanceOf", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transfer", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "owner", "type": "address" }, { "internalType": "address", "name": "spender", "type": "address" } ], "name": "allowance", "outputs": [ { "internalType": "uint256", "name": "", "type": "uint256" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "approve", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "from", "type": "address" }, { "internalType": "address", "name": "to", "type": "address" }, { "internalType": "uint256", "name": "amount", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "addedValue", "type": "uint256" } ], "name": "increaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "address", "name": "spender", "type": "address" }, { "internalType": "uint256", "name": "subtractedValue", "type": "uint256" } ], "name": "decreaseAllowance", "outputs": [ { "internalType": "bool", "name": "", "type": "bool" } ], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.8.7+commit.e28d00a7\"},\"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\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"subtractedValue\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"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\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}],\"devdoc\":{\"details\":\"Implementation of the {IERC20} interface. This implementation is agnostic to the way tokens are created. This means that a supply mechanism has to be added in a derived contract using {_mint}. For a generic mechanism see {ERC20PresetMinterPauser}. TIP: For a detailed writeup see our guide https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How to implement supply mechanisms]. We have followed general OpenZeppelin Contracts guidelines: functions revert instead returning `false` on failure. This behavior is nonetheless conventional and does not conflict with the expectations of ERC20 applications. Additionally, an {Approval} event is emitted on calls to {transferFrom}. This allows applications to reconstruct the allowance for all accounts just by listening to said events. Other implementations of the EIP may not emit these events, as it isn't required by the specification. Finally, the non-standard {decreaseAllowance} and {increaseAllowance} functions have been added to mitigate the well-known issues around setting allowances. See {IERC20-approve}.\",\"kind\":\"dev\",\"methods\":{\"allowance(address,address)\":{\"details\":\"See {IERC20-allowance}.\"},\"approve(address,uint256)\":{\"details\":\"See {IERC20-approve}. NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on `transferFrom`. This is semantically equivalent to an infinite approval. Requirements: - `spender` cannot be the zero address.\"},\"balanceOf(address)\":{\"details\":\"See {IERC20-balanceOf}.\"},\"constructor\":{\"details\":\"Sets the values for {name} and {symbol}. The default value of {decimals} is 18. To select a different value for {decimals} you should overload it. All two of these values are immutable: they can only be set once during construction.\"},\"decimals()\":{\"details\":\"Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5.05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless this function is overridden; NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}.\"},\"decreaseAllowance(address,uint256)\":{\"details\":\"Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`.\"},\"increaseAllowance(address,uint256)\":{\"details\":\"Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address.\"},\"name()\":{\"details\":\"Returns the name of the token.\"},\"symbol()\":{\"details\":\"Returns the symbol of the token, usually a shorter version of the name.\"},\"totalSupply()\":{\"details\":\"See {IERC20-totalSupply}.\"},\"transfer(address,uint256)\":{\"details\":\"See {IERC20-transfer}. Requirements: - `to` cannot be the zero address. - the caller must have a balance of at least `amount`.\"},\"transferFrom(address,address,uint256)\":{\"details\":\"See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. NOTE: Does not update the allowance if the current allowance is the maximum `uint256`. Requirements: - `from` and `to` cannot be the zero address. - `from` must have a balance of at least `amount`. - the caller must have allowance for ``from``'s tokens of at least `amount`.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"@openzeppelin/contracts/token/ERC20/ERC20.sol\":\"ERC20\"},\"evmVersion\":\"london\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts/token/ERC20/ERC20.sol\":{\"keccak256\":\"0x24b04b8aacaaf1a4a0719117b29c9c3647b1f479c5ac2a60f5ff1bb6d839c238\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://43e46da9d9f49741ecd876a269e71bc7494058d7a8e9478429998adb5bc3eaa0\",\"dweb:/ipfs/QmUtp4cqzf22C5rJ76AabKADquGWcjsc33yjYXxXC4sDvy\"]},\"@openzeppelin/contracts/token/ERC20/IERC20.sol\":{\"keccak256\":\"0x9750c6b834f7b43000631af5cc30001c5f547b3ceb3635488f140f60e897ea6b\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://5a7d5b1ef5d8d5889ad2ed89d8619c09383b80b72ab226e0fe7bde1636481e34\",\"dweb:/ipfs/QmebXWgtEfumQGBdVeM6c71McLixYXQP5Bk6kKXuoY4Bmr\"]},\"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol\":{\"keccak256\":\"0x8de418a5503946cabe331f35fe242d3201a73f67f77aaeb7110acb1f30423aca\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://5a376d3dda2cb70536c0a45c208b29b34ac560c4cb4f513a42079f96ba47d2dd\",\"dweb:/ipfs/QmZQg6gn1sUpM8wHzwNvSnihumUCAhxD119MpXeKp8B9s8\"]},\"@openzeppelin/contracts/utils/Context.sol\":{\"keccak256\":\"0xe2e337e6dde9ef6b680e07338c493ebea1b5fd09b43424112868e9cc1706bca7\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://6df0ddf21ce9f58271bdfaa85cde98b200ef242a05a3f85c2bc10a8294800a92\",\"dweb:/ipfs/QmRK2Y5Yc6BK7tGKkgsgn3aJEQGi5aakeSPZvS65PV8Xp3\"]}},\"version\":1}", 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"source": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC20.sol\";\nimport \"./extensions/IERC20Metadata.sol\";\nimport \"../../utils/Context.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\n * instead returning `false` on failure. This behavior is nonetheless\n * conventional and does not conflict with the expectations of ERC20\n * applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is Context, IERC20, IERC20Metadata {\n mapping(address => uint256) private _balances;\n\n mapping(address => mapping(address => uint256)) private _allowances;\n\n uint256 private _totalSupply;\n\n string private _name;\n string private _symbol;\n\n /**\n * @dev Sets the values for {name} and {symbol}.\n *\n * The default value of {decimals} is 18. To select a different value for\n * {decimals} you should overload it.\n *\n * All two of these values are immutable: they can only be set once during\n * construction.\n */\n constructor(string memory name_, string memory symbol_) {\n _name = name_;\n _symbol = symbol_;\n }\n\n /**\n * @dev Returns the name of the token.\n */\n function name() public view virtual override returns (string memory) {\n return _name;\n }\n\n /**\n * @dev Returns the symbol of the token, usually a shorter version of the\n * name.\n */\n function symbol() public view virtual override returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev Returns the number of decimals used to get its user representation.\n * For example, if `decimals` equals `2`, a balance of `505` tokens should\n * be displayed to a user as `5.05` (`505 / 10 ** 2`).\n *\n * Tokens usually opt for a value of 18, imitating the relationship between\n * Ether and Wei. This is the value {ERC20} uses, unless this function is\n * overridden;\n *\n * NOTE: This information is only used for _display_ purposes: it in\n * no way affects any of the arithmetic of the contract, including\n * {IERC20-balanceOf} and {IERC20-transfer}.\n */\n function decimals() public view virtual override returns (uint8) {\n return 18;\n }\n\n /**\n * @dev See {IERC20-totalSupply}.\n */\n function totalSupply() public view virtual override returns (uint256) {\n return _totalSupply;\n }\n\n /**\n * @dev See {IERC20-balanceOf}.\n */\n function balanceOf(address account) public view virtual override returns (uint256) {\n return _balances[account];\n }\n\n /**\n * @dev See {IERC20-transfer}.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n * - the caller must have a balance of at least `amount`.\n */\n function transfer(address to, uint256 amount) public virtual override returns (bool) {\n address owner = _msgSender();\n _transfer(owner, to, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-allowance}.\n */\n function allowance(address owner, address spender) public view virtual override returns (uint256) {\n return _allowances[owner][spender];\n }\n\n /**\n * @dev See {IERC20-approve}.\n *\n * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\n * `transferFrom`. This is semantically equivalent to an infinite approval.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function approve(address spender, uint256 amount) public virtual override returns (bool) {\n address owner = _msgSender();\n _approve(owner, spender, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-transferFrom}.\n *\n * Emits an {Approval} event indicating the updated allowance. This is not\n * required by the EIP. See the note at the beginning of {ERC20}.\n *\n * NOTE: Does not update the allowance if the current allowance\n * is the maximum `uint256`.\n *\n * Requirements:\n *\n * - `from` and `to` cannot be the zero address.\n * - `from` must have a balance of at least `amount`.\n * - the caller must have allowance for ``from``'s tokens of at least\n * `amount`.\n */\n function transferFrom(\n address from,\n address to,\n uint256 amount\n ) public virtual override returns (bool) {\n address spender = _msgSender();\n _spendAllowance(from, spender, amount);\n _transfer(from, to, amount);\n return true;\n }\n\n /**\n * @dev Atomically increases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n address owner = _msgSender();\n _approve(owner, spender, allowance(owner, spender) + addedValue);\n return true;\n }\n\n /**\n * @dev Atomically decreases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n * - `spender` must have allowance for the caller of at least\n * `subtractedValue`.\n */\n function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n address owner = _msgSender();\n uint256 currentAllowance = allowance(owner, spender);\n require(currentAllowance >= subtractedValue, \"ERC20: decreased allowance below zero\");\n unchecked {\n _approve(owner, spender, currentAllowance - subtractedValue);\n }\n\n return true;\n }\n\n /**\n * @dev Moves `amount` of tokens from `from` to `to`.\n *\n * This internal function is equivalent to {transfer}, and can be used to\n * e.g. implement automatic token fees, slashing mechanisms, etc.\n *\n * Emits a {Transfer} event.\n *\n * Requirements:\n *\n * - `from` cannot be the zero address.\n * - `to` cannot be the zero address.\n * - `from` must have a balance of at least `amount`.\n */\n function _transfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {\n require(from != address(0), \"ERC20: transfer from the zero address\");\n require(to != address(0), \"ERC20: transfer to the zero address\");\n\n _beforeTokenTransfer(from, to, amount);\n\n uint256 fromBalance = _balances[from];\n require(fromBalance >= amount, \"ERC20: transfer amount exceeds balance\");\n unchecked {\n _balances[from] = fromBalance - amount;\n }\n _balances[to] += amount;\n\n emit Transfer(from, to, amount);\n\n _afterTokenTransfer(from, to, amount);\n }\n\n /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n * the total supply.\n *\n * Emits a {Transfer} event with `from` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n */\n function _mint(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: mint to the zero address\");\n\n _beforeTokenTransfer(address(0), account, amount);\n\n _totalSupply += amount;\n _balances[account] += amount;\n emit Transfer(address(0), account, amount);\n\n _afterTokenTransfer(address(0), account, amount);\n }\n\n /**\n * @dev Destroys `amount` tokens from `account`, reducing the\n * total supply.\n *\n * Emits a {Transfer} event with `to` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n * - `account` must have at least `amount` tokens.\n */\n function _burn(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: burn from the zero address\");\n\n _beforeTokenTransfer(account, address(0), amount);\n\n uint256 accountBalance = _balances[account];\n require(accountBalance >= amount, \"ERC20: burn amount exceeds balance\");\n unchecked {\n _balances[account] = accountBalance - amount;\n }\n _totalSupply -= amount;\n\n emit Transfer(account, address(0), amount);\n\n _afterTokenTransfer(account, address(0), amount);\n }\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n *\n * This internal function is equivalent to `approve`, and can be used to\n * e.g. set automatic allowances for certain subsystems, etc.\n *\n * Emits an {Approval} event.\n *\n * Requirements:\n *\n * - `owner` cannot be the zero address.\n * - `spender` cannot be the zero address.\n */\n function _approve(\n address owner,\n address spender,\n uint256 amount\n ) internal virtual {\n require(owner != address(0), \"ERC20: approve from the zero address\");\n require(spender != address(0), \"ERC20: approve to the zero address\");\n\n _allowances[owner][spender] = amount;\n emit Approval(owner, spender, amount);\n }\n\n /**\n * @dev Updates `owner` s allowance for `spender` based on spent `amount`.\n *\n * Does not update the allowance amount in case of infinite allowance.\n * Revert if not enough allowance is available.\n *\n * Might emit an {Approval} event.\n */\n function _spendAllowance(\n address owner,\n address spender,\n uint256 amount\n ) internal virtual {\n uint256 currentAllowance = allowance(owner, spender);\n if (currentAllowance != type(uint256).max) {\n require(currentAllowance >= amount, \"ERC20: insufficient allowance\");\n unchecked {\n _approve(owner, spender, currentAllowance - amount);\n }\n }\n }\n\n /**\n * @dev Hook that is called before any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * will be transferred to `to`.\n * - when `from` is zero, `amount` tokens will be minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {}\n\n /**\n * @dev Hook that is called after any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * has been transferred to `to`.\n * - when `from` is zero, `amount` tokens have been minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens have been burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _afterTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {}\n}\n", "sourcePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "ast": { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "exportedSymbols": { "Context": [ 11508 ], "ERC20": [ 10771 ], "IERC20": [ 10849 ], "IERC20Metadata": [ 10874 ] }, "id": 10772, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 10187, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "105:23:49" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 10188, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 10850, "src": "130:22:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol", "file": "./extensions/IERC20Metadata.sol", "id": 10189, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 10875, "src": "153:41:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Context.sol", "file": "../../utils/Context.sol", "id": 10190, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 11509, "src": "195:33:49", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "baseName": { "id": 10192, "name": "Context", "nodeType": "IdentifierPath", "referencedDeclaration": 11508, "src": "1421:7:49" }, "id": 10193, "nodeType": "InheritanceSpecifier", "src": "1421:7:49" }, { "baseName": { "id": 10194, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 10849, "src": "1430:6:49" }, "id": 10195, "nodeType": "InheritanceSpecifier", "src": "1430:6:49" }, { "baseName": { "id": 10196, "name": "IERC20Metadata", "nodeType": "IdentifierPath", "referencedDeclaration": 10874, "src": "1438:14:49" }, "id": 10197, "nodeType": "InheritanceSpecifier", "src": "1438:14:49" } ], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 10191, "nodeType": "StructuredDocumentation", "src": "230:1172:49", "text": " @dev Implementation of the {IERC20} interface.\n This implementation is agnostic to the way tokens are created. This means\n that a supply mechanism has to be added in a derived contract using {_mint}.\n For a generic mechanism see {ERC20PresetMinterPauser}.\n TIP: For a detailed writeup see our guide\n https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n to implement supply mechanisms].\n We have followed general OpenZeppelin Contracts guidelines: functions revert\n instead returning `false` on failure. This behavior is nonetheless\n conventional and does not conflict with the expectations of ERC20\n applications.\n Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n This allows applications to reconstruct the allowance for all accounts just\n by listening to said events. Other implementations of the EIP may not emit\n these events, as it isn't required by the specification.\n Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n functions have been added to mitigate the well-known issues around setting\n allowances. See {IERC20-approve}." }, "fullyImplemented": true, "id": 10771, "linearizedBaseContracts": [ 10771, 10874, 10849, 11508 ], "name": "ERC20", "nameLocation": "1412:5:49", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "id": 10201, "mutability": "mutable", "name": "_balances", "nameLocation": "1495:9:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1459:45:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "typeName": { "id": 10200, "keyType": { "id": 10198, "name": "address", "nodeType": "ElementaryTypeName", "src": "1467:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1459:27:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 10199, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1478:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "visibility": "private" }, { "constant": false, "id": 10207, "mutability": "mutable", "name": "_allowances", "nameLocation": "1567:11:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1511:67:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "typeName": { "id": 10206, "keyType": { "id": 10202, "name": "address", "nodeType": "ElementaryTypeName", "src": "1519:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1511:47:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "valueType": { "id": 10205, "keyType": { "id": 10203, "name": "address", "nodeType": "ElementaryTypeName", "src": "1538:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1530:27:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 10204, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1549:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } } }, "visibility": "private" }, { "constant": false, "id": 10209, "mutability": "mutable", "name": "_totalSupply", "nameLocation": "1601:12:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1585:28:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10208, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1585:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "private" }, { "constant": false, "id": 10211, "mutability": "mutable", "name": "_name", "nameLocation": "1635:5:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1620:20:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 10210, "name": "string", "nodeType": "ElementaryTypeName", "src": "1620:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "constant": false, "id": 10213, "mutability": "mutable", "name": "_symbol", "nameLocation": "1661:7:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1646:22:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 10212, "name": "string", "nodeType": "ElementaryTypeName", "src": "1646:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "body": { "id": 10229, "nodeType": "Block", "src": "2034:57:49", "statements": [ { "expression": { "id": 10223, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10221, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10211, "src": "2044:5:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10222, "name": "name_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10216, "src": "2052:5:49", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2044:13:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 10224, "nodeType": "ExpressionStatement", "src": "2044:13:49" }, { "expression": { "id": 10227, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10225, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10213, "src": "2067:7:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10226, "name": "symbol_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10218, "src": "2077:7:49", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2067:17:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 10228, "nodeType": "ExpressionStatement", "src": "2067:17:49" } ] }, "documentation": { "id": 10214, "nodeType": "StructuredDocumentation", "src": "1675:298:49", "text": " @dev Sets the values for {name} and {symbol}.\n The default value of {decimals} is 18. To select a different value for\n {decimals} you should overload it.\n All two of these values are immutable: they can only be set once during\n construction." }, "id": 10230, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nameLocation": "-1:-1:-1", "nodeType": "FunctionDefinition", "parameters": { "id": 10219, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10216, "mutability": "mutable", "name": "name_", "nameLocation": "2004:5:49", "nodeType": "VariableDeclaration", "scope": 10230, "src": "1990:19:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10215, "name": "string", "nodeType": "ElementaryTypeName", "src": "1990:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" }, { "constant": false, "id": 10218, "mutability": "mutable", "name": "symbol_", "nameLocation": "2025:7:49", "nodeType": "VariableDeclaration", "scope": 10230, "src": "2011:21:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10217, "name": "string", "nodeType": "ElementaryTypeName", "src": "2011:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "1989:44:49" }, "returnParameters": { "id": 10220, "nodeType": "ParameterList", "parameters": [], "src": "2034:0:49" }, "scope": 10771, "src": "1978:113:49", "stateMutability": "nonpayable", "virtual": false, "visibility": "public" }, { "baseFunctions": [ 10861 ], "body": { "id": 10239, "nodeType": "Block", "src": "2225:29:49", "statements": [ { "expression": { "id": 10237, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10211, "src": "2242:5:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 10236, "id": 10238, "nodeType": "Return", "src": "2235:12:49" } ] }, "documentation": { "id": 10231, "nodeType": "StructuredDocumentation", "src": "2097:54:49", "text": " @dev Returns the name of the token." }, "functionSelector": "06fdde03", "id": 10240, "implemented": true, "kind": "function", "modifiers": [], "name": "name", "nameLocation": "2165:4:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10233, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2192:8:49" }, "parameters": { "id": 10232, "nodeType": "ParameterList", "parameters": [], "src": "2169:2:49" }, "returnParameters": { "id": 10236, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10235, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10240, "src": "2210:13:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10234, "name": "string", "nodeType": "ElementaryTypeName", "src": "2210:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2209:15:49" }, "scope": 10771, "src": "2156:98:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10867 ], "body": { "id": 10249, "nodeType": "Block", "src": "2438:31:49", "statements": [ { "expression": { "id": 10247, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10213, "src": "2455:7:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 10246, "id": 10248, "nodeType": "Return", "src": "2448:14:49" } ] }, "documentation": { "id": 10241, "nodeType": "StructuredDocumentation", "src": "2260:102:49", "text": " @dev Returns the symbol of the token, usually a shorter version of the\n name." }, "functionSelector": "95d89b41", "id": 10250, "implemented": true, "kind": "function", "modifiers": [], "name": "symbol", "nameLocation": "2376:6:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10243, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2405:8:49" }, "parameters": { "id": 10242, "nodeType": "ParameterList", "parameters": [], "src": "2382:2:49" }, "returnParameters": { "id": 10246, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10245, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10250, "src": "2423:13:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10244, "name": "string", "nodeType": "ElementaryTypeName", "src": "2423:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2422:15:49" }, "scope": 10771, "src": "2367:102:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10873 ], "body": { "id": 10259, "nodeType": "Block", "src": "3158:26:49", "statements": [ { "expression": { "hexValue": "3138", "id": 10257, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "3175:2:49", "typeDescriptions": { "typeIdentifier": "t_rational_18_by_1", "typeString": "int_const 18" }, "value": "18" }, "functionReturnParameters": 10256, "id": 10258, "nodeType": "Return", "src": "3168:9:49" } ] }, "documentation": { "id": 10251, "nodeType": "StructuredDocumentation", "src": "2475:613:49", "text": " @dev Returns the number of decimals used to get its user representation.\n For example, if `decimals` equals `2`, a balance of `505` tokens should\n be displayed to a user as `5.05` (`505 / 10 ** 2`).\n Tokens usually opt for a value of 18, imitating the relationship between\n Ether and Wei. This is the value {ERC20} uses, unless this function is\n overridden;\n NOTE: This information is only used for _display_ purposes: it in\n no way affects any of the arithmetic of the contract, including\n {IERC20-balanceOf} and {IERC20-transfer}." }, "functionSelector": "313ce567", "id": 10260, "implemented": true, "kind": "function", "modifiers": [], "name": "decimals", "nameLocation": "3102:8:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10253, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3133:8:49" }, "parameters": { "id": 10252, "nodeType": "ParameterList", "parameters": [], "src": "3110:2:49" }, "returnParameters": { "id": 10256, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10255, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10260, "src": "3151:5:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 10254, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "3151:5:49", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "visibility": "internal" } ], "src": "3150:7:49" }, "scope": 10771, "src": "3093:91:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10798 ], "body": { "id": 10269, "nodeType": "Block", "src": "3314:36:49", "statements": [ { "expression": { "id": 10267, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "3331:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10266, "id": 10268, "nodeType": "Return", "src": "3324:19:49" } ] }, "documentation": { "id": 10261, "nodeType": "StructuredDocumentation", "src": "3190:49:49", "text": " @dev See {IERC20-totalSupply}." }, "functionSelector": "18160ddd", "id": 10270, "implemented": true, "kind": "function", "modifiers": [], "name": "totalSupply", "nameLocation": "3253:11:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10263, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3287:8:49" }, "parameters": { "id": 10262, "nodeType": "ParameterList", "parameters": [], "src": "3264:2:49" }, "returnParameters": { "id": 10266, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10265, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10270, "src": "3305:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10264, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3305:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3304:9:49" }, "scope": 10771, "src": "3244:106:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10806 ], "body": { "id": 10283, "nodeType": "Block", "src": "3491:42:49", "statements": [ { "expression": { "baseExpression": { "id": 10279, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "3508:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10281, "indexExpression": { "id": 10280, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10273, "src": "3518:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "3508:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10278, "id": 10282, "nodeType": "Return", "src": "3501:25:49" } ] }, "documentation": { "id": 10271, "nodeType": "StructuredDocumentation", "src": "3356:47:49", "text": " @dev See {IERC20-balanceOf}." }, "functionSelector": "70a08231", "id": 10284, "implemented": true, "kind": "function", "modifiers": [], "name": "balanceOf", "nameLocation": "3417:9:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10275, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3464:8:49" }, "parameters": { "id": 10274, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10273, "mutability": "mutable", "name": "account", "nameLocation": "3435:7:49", "nodeType": "VariableDeclaration", "scope": 10284, "src": "3427:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10272, "name": "address", "nodeType": "ElementaryTypeName", "src": "3427:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3426:17:49" }, "returnParameters": { "id": 10278, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10277, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10284, "src": "3482:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10276, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3482:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3481:9:49" }, "scope": 10771, "src": "3408:125:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10816 ], "body": { "id": 10308, "nodeType": "Block", "src": "3814:104:49", "statements": [ { "assignments": [ 10296 ], "declarations": [ { "constant": false, "id": 10296, "mutability": "mutable", "name": "owner", "nameLocation": "3832:5:49", "nodeType": "VariableDeclaration", "scope": 10308, "src": "3824:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10295, "name": "address", "nodeType": "ElementaryTypeName", "src": "3824:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10299, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10297, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "3840:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10298, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3840:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "3824:28:49" }, { "expression": { "arguments": [ { "id": 10301, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10296, "src": "3872:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10302, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10287, "src": "3879:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10303, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10289, "src": "3883:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10300, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10532, "src": "3862:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10304, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3862:28:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10305, "nodeType": "ExpressionStatement", "src": "3862:28:49" }, { "expression": { "hexValue": "74727565", "id": 10306, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "3907:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10294, "id": 10307, "nodeType": "Return", "src": "3900:11:49" } ] }, "documentation": { "id": 10285, "nodeType": "StructuredDocumentation", "src": "3539:185:49", "text": " @dev See {IERC20-transfer}.\n Requirements:\n - `to` cannot be the zero address.\n - the caller must have a balance of at least `amount`." }, "functionSelector": "a9059cbb", "id": 10309, "implemented": true, "kind": "function", "modifiers": [], "name": "transfer", "nameLocation": "3738:8:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10291, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3790:8:49" }, "parameters": { "id": 10290, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10287, "mutability": "mutable", "name": "to", "nameLocation": "3755:2:49", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3747:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10286, "name": "address", "nodeType": "ElementaryTypeName", "src": "3747:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10289, "mutability": "mutable", "name": "amount", "nameLocation": "3767:6:49", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3759:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10288, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3759:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3746:28:49" }, "returnParameters": { "id": 10294, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10293, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3808:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10292, "name": "bool", "nodeType": "ElementaryTypeName", "src": "3808:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "3807:6:49" }, "scope": 10771, "src": "3729:189:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10826 ], "body": { "id": 10326, "nodeType": "Block", "src": "4074:51:49", "statements": [ { "expression": { "baseExpression": { "baseExpression": { "id": 10320, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10207, "src": "4091:11:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 10322, "indexExpression": { "id": 10321, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10312, "src": "4103:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:18:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10324, "indexExpression": { "id": 10323, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10314, "src": "4110:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:27:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10319, "id": 10325, "nodeType": "Return", "src": "4084:34:49" } ] }, "documentation": { "id": 10310, "nodeType": "StructuredDocumentation", "src": "3924:47:49", "text": " @dev See {IERC20-allowance}." }, "functionSelector": "dd62ed3e", "id": 10327, "implemented": true, "kind": "function", "modifiers": [], "name": "allowance", "nameLocation": "3985:9:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10316, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4047:8:49" }, "parameters": { "id": 10315, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10312, "mutability": "mutable", "name": "owner", "nameLocation": "4003:5:49", "nodeType": "VariableDeclaration", "scope": 10327, "src": "3995:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10311, "name": "address", "nodeType": "ElementaryTypeName", "src": "3995:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10314, "mutability": "mutable", "name": "spender", "nameLocation": "4018:7:49", "nodeType": "VariableDeclaration", "scope": 10327, "src": "4010:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10313, "name": "address", "nodeType": "ElementaryTypeName", "src": "4010:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3994:32:49" }, "returnParameters": { "id": 10319, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10318, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10327, "src": "4065:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10317, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4065:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4064:9:49" }, "scope": 10771, "src": "3976:149:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10836 ], "body": { "id": 10351, "nodeType": "Block", "src": "4522:108:49", "statements": [ { "assignments": [ 10339 ], "declarations": [ { "constant": false, "id": 10339, "mutability": "mutable", "name": "owner", "nameLocation": "4540:5:49", "nodeType": "VariableDeclaration", "scope": 10351, "src": "4532:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10338, "name": "address", "nodeType": "ElementaryTypeName", "src": "4532:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10342, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10340, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "4548:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10341, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4548:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "4532:28:49" }, { "expression": { "arguments": [ { "id": 10344, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10339, "src": "4579:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10345, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10330, "src": "4586:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10346, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10332, "src": "4595:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10343, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "4570:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10347, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4570:32:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10348, "nodeType": "ExpressionStatement", "src": "4570:32:49" }, { "expression": { "hexValue": "74727565", "id": 10349, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "4619:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10337, "id": 10350, "nodeType": "Return", "src": "4612:11:49" } ] }, "documentation": { "id": 10328, "nodeType": "StructuredDocumentation", "src": "4131:297:49", "text": " @dev See {IERC20-approve}.\n NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\n `transferFrom`. This is semantically equivalent to an infinite approval.\n Requirements:\n - `spender` cannot be the zero address." }, "functionSelector": "095ea7b3", "id": 10352, "implemented": true, "kind": "function", "modifiers": [], "name": "approve", "nameLocation": "4442:7:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10334, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4498:8:49" }, "parameters": { "id": 10333, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10330, "mutability": "mutable", "name": "spender", "nameLocation": "4458:7:49", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4450:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10329, "name": "address", "nodeType": "ElementaryTypeName", "src": "4450:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10332, "mutability": "mutable", "name": "amount", "nameLocation": "4475:6:49", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4467:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10331, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4467:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4449:33:49" }, "returnParameters": { "id": 10337, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10336, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4516:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10335, "name": "bool", "nodeType": "ElementaryTypeName", "src": "4516:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "4515:6:49" }, "scope": 10771, "src": "4433:197:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10848 ], "body": { "id": 10384, "nodeType": "Block", "src": "5325:153:49", "statements": [ { "assignments": [ 10366 ], "declarations": [ { "constant": false, "id": 10366, "mutability": "mutable", "name": "spender", "nameLocation": "5343:7:49", "nodeType": "VariableDeclaration", "scope": 10384, "src": "5335:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10365, "name": "address", "nodeType": "ElementaryTypeName", "src": "5335:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10369, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10367, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "5353:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10368, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5353:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5335:30:49" }, { "expression": { "arguments": [ { "id": 10371, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10355, "src": "5391:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10372, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10366, "src": "5397:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10373, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10359, "src": "5406:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10370, "name": "_spendAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10748, "src": "5375:15:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10374, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5375:38:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10375, "nodeType": "ExpressionStatement", "src": "5375:38:49" }, { "expression": { "arguments": [ { "id": 10377, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10355, "src": "5433:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10378, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10357, "src": "5439:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10379, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10359, "src": "5443:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10376, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10532, "src": "5423:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10380, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5423:27:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10381, "nodeType": "ExpressionStatement", "src": "5423:27:49" }, { "expression": { "hexValue": "74727565", "id": 10382, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "5467:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10364, "id": 10383, "nodeType": "Return", "src": "5460:11:49" } ] }, "documentation": { "id": 10353, "nodeType": "StructuredDocumentation", "src": "4636:551:49", "text": " @dev See {IERC20-transferFrom}.\n Emits an {Approval} event indicating the updated allowance. This is not\n required by the EIP. See the note at the beginning of {ERC20}.\n NOTE: Does not update the allowance if the current allowance\n is the maximum `uint256`.\n Requirements:\n - `from` and `to` cannot be the zero address.\n - `from` must have a balance of at least `amount`.\n - the caller must have allowance for ``from``'s tokens of at least\n `amount`." }, "functionSelector": "23b872dd", "id": 10385, "implemented": true, "kind": "function", "modifiers": [], "name": "transferFrom", "nameLocation": "5201:12:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10361, "nodeType": "OverrideSpecifier", "overrides": [], "src": "5301:8:49" }, "parameters": { "id": 10360, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10355, "mutability": "mutable", "name": "from", "nameLocation": "5231:4:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5223:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10354, "name": "address", "nodeType": "ElementaryTypeName", "src": "5223:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10357, "mutability": "mutable", "name": "to", "nameLocation": "5253:2:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5245:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10356, "name": "address", "nodeType": "ElementaryTypeName", "src": "5245:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10359, "mutability": "mutable", "name": "amount", "nameLocation": "5273:6:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5265:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10358, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5265:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5213:72:49" }, "returnParameters": { "id": 10364, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10363, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5319:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10362, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5319:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5318:6:49" }, "scope": 10771, "src": "5192:286:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10413, "nodeType": "Block", "src": "5967:140:49", "statements": [ { "assignments": [ 10396 ], "declarations": [ { "constant": false, "id": 10396, "mutability": "mutable", "name": "owner", "nameLocation": "5985:5:49", "nodeType": "VariableDeclaration", "scope": 10413, "src": "5977:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10395, "name": "address", "nodeType": "ElementaryTypeName", "src": "5977:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10399, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10397, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "5993:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10398, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5993:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5977:28:49" }, { "expression": { "arguments": [ { "id": 10401, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10396, "src": "6024:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10402, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10388, "src": "6031:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10408, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 10404, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10396, "src": "6050:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10405, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10388, "src": "6057:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10403, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "6040:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10406, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6040:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "id": 10407, "name": "addedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10390, "src": "6068:10:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6040:38:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10400, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "6015:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10409, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6015:64:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10410, "nodeType": "ExpressionStatement", "src": "6015:64:49" }, { "expression": { "hexValue": "74727565", "id": 10411, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "6096:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10394, "id": 10412, "nodeType": "Return", "src": "6089:11:49" } ] }, "documentation": { "id": 10386, "nodeType": "StructuredDocumentation", "src": "5484:384:49", "text": " @dev Atomically increases the allowance granted to `spender` by the caller.\n This is an alternative to {approve} that can be used as a mitigation for\n problems described in {IERC20-approve}.\n Emits an {Approval} event indicating the updated allowance.\n Requirements:\n - `spender` cannot be the zero address." }, "functionSelector": "39509351", "id": 10414, "implemented": true, "kind": "function", "modifiers": [], "name": "increaseAllowance", "nameLocation": "5882:17:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10391, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10388, "mutability": "mutable", "name": "spender", "nameLocation": "5908:7:49", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5900:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10387, "name": "address", "nodeType": "ElementaryTypeName", "src": "5900:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10390, "mutability": "mutable", "name": "addedValue", "nameLocation": "5925:10:49", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5917:18:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10389, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5917:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5899:37:49" }, "returnParameters": { "id": 10394, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10393, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5961:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10392, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5961:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5960:6:49" }, "scope": 10771, "src": "5873:234:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10454, "nodeType": "Block", "src": "6693:328:49", "statements": [ { "assignments": [ 10425 ], "declarations": [ { "constant": false, "id": 10425, "mutability": "mutable", "name": "owner", "nameLocation": "6711:5:49", "nodeType": "VariableDeclaration", "scope": 10454, "src": "6703:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10424, "name": "address", "nodeType": "ElementaryTypeName", "src": "6703:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10428, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10426, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "6719:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10427, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6719:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "6703:28:49" }, { "assignments": [ 10430 ], "declarations": [ { "constant": false, "id": 10430, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "6749:16:49", "nodeType": "VariableDeclaration", "scope": 10454, "src": "6741:24:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10429, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6741:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10435, "initialValue": { "arguments": [ { "id": 10432, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10425, "src": "6778:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10433, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10417, "src": "6785:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10431, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "6768:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10434, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6768:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "6741:52:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10439, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10437, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10430, "src": "6811:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10438, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10419, "src": "6831:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6811:35:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 10440, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "6848:39:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_f8b476f7d28209d77d4a4ac1fe36b9f8259aa1bb6bddfa6e89de7e51615cf8a8", "typeString": "literal_string \"ERC20: decreased allowance below zero\"" }, "value": "ERC20: decreased allowance below zero" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_f8b476f7d28209d77d4a4ac1fe36b9f8259aa1bb6bddfa6e89de7e51615cf8a8", "typeString": "literal_string \"ERC20: decreased allowance below zero\"" } ], "id": 10436, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "6803:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10441, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6803:85:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10442, "nodeType": "ExpressionStatement", "src": "6803:85:49" }, { "id": 10451, "nodeType": "UncheckedBlock", "src": "6898:95:49", "statements": [ { "expression": { "arguments": [ { "id": 10444, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10425, "src": "6931:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10445, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10417, "src": "6938:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10448, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10446, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10430, "src": "6947:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10447, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10419, "src": "6966:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6947:34:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10443, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "6922:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10449, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6922:60:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10450, "nodeType": "ExpressionStatement", "src": "6922:60:49" } ] }, { "expression": { "hexValue": "74727565", "id": 10452, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "7010:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10423, "id": 10453, "nodeType": "Return", "src": "7003:11:49" } ] }, "documentation": { "id": 10415, "nodeType": "StructuredDocumentation", "src": "6113:476:49", "text": " @dev Atomically decreases the allowance granted to `spender` by the caller.\n This is an alternative to {approve} that can be used as a mitigation for\n problems described in {IERC20-approve}.\n Emits an {Approval} event indicating the updated allowance.\n Requirements:\n - `spender` cannot be the zero address.\n - `spender` must have allowance for the caller of at least\n `subtractedValue`." }, "functionSelector": "a457c2d7", "id": 10455, "implemented": true, "kind": "function", "modifiers": [], "name": "decreaseAllowance", "nameLocation": "6603:17:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10420, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10417, "mutability": "mutable", "name": "spender", "nameLocation": "6629:7:49", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6621:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10416, "name": "address", "nodeType": "ElementaryTypeName", "src": "6621:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10419, "mutability": "mutable", "name": "subtractedValue", "nameLocation": "6646:15:49", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6638:23:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10418, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6638:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "6620:42:49" }, "returnParameters": { "id": 10423, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10422, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6687:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10421, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6687:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "6686:6:49" }, "scope": 10771, "src": "6594:427:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10531, "nodeType": "Block", "src": "7583:543:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10471, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10466, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7601:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10469, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7617:1:49", "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": 10468, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7609:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10467, "name": "address", "nodeType": "ElementaryTypeName", "src": "7609:7:49", "typeDescriptions": {} } }, "id": 10470, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7609:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7601:18:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e736665722066726f6d20746865207a65726f2061646472657373", "id": 10472, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7621:39:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_baecc556b46f4ed0f2b4cb599d60785ac8563dd2dc0a5bf12edea1c39e5e1fea", "typeString": "literal_string \"ERC20: transfer from the zero address\"" }, "value": "ERC20: transfer from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_baecc556b46f4ed0f2b4cb599d60785ac8563dd2dc0a5bf12edea1c39e5e1fea", "typeString": "literal_string \"ERC20: transfer from the zero address\"" } ], "id": 10465, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7593:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10473, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7593:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10474, "nodeType": "ExpressionStatement", "src": "7593:68:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10481, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10476, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "7679:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10479, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7693:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10478, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7685:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10477, "name": "address", "nodeType": "ElementaryTypeName", "src": "7685:7:49", "typeDescriptions": {} } }, "id": 10480, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7685:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7679:16:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220746f20746865207a65726f2061646472657373", "id": 10482, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7697:37:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" }, "value": "ERC20: transfer to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" } ], "id": 10475, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7671:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10483, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7671:64:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10484, "nodeType": "ExpressionStatement", "src": "7671:64:49" }, { "expression": { "arguments": [ { "id": 10486, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7767:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10487, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "7773:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10488, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7777:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10485, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "7746:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10489, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7746:38:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10490, "nodeType": "ExpressionStatement", "src": "7746:38:49" }, { "assignments": [ 10492 ], "declarations": [ { "constant": false, "id": 10492, "mutability": "mutable", "name": "fromBalance", "nameLocation": "7803:11:49", "nodeType": "VariableDeclaration", "scope": 10531, "src": "7795:19:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10491, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7795:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10496, "initialValue": { "baseExpression": { "id": 10493, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "7817:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10495, "indexExpression": { "id": 10494, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7827:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "7817:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "7795:37:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10500, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10498, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10492, "src": "7850:11:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10499, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7865:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7850:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220616d6f756e7420657863656564732062616c616e6365", "id": 10501, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7873:40:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_4107e8a8b9e94bf8ff83080ddec1c0bffe897ebc2241b89d44f66b3d274088b6", "typeString": "literal_string \"ERC20: transfer amount exceeds balance\"" }, "value": "ERC20: transfer amount exceeds balance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_4107e8a8b9e94bf8ff83080ddec1c0bffe897ebc2241b89d44f66b3d274088b6", "typeString": "literal_string \"ERC20: transfer amount exceeds balance\"" } ], "id": 10497, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7842:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10502, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7842:72:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10503, "nodeType": "ExpressionStatement", "src": "7842:72:49" }, { "id": 10512, "nodeType": "UncheckedBlock", "src": "7924:73:49", "statements": [ { "expression": { "id": 10510, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10504, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "7948:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10506, "indexExpression": { "id": 10505, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7958:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "7948:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10509, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10507, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10492, "src": "7966:11:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10508, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7980:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7966:20:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7948:38:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10511, "nodeType": "ExpressionStatement", "src": "7948:38:49" } ] }, { "expression": { "id": 10517, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10513, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "8006:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10515, "indexExpression": { "id": 10514, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8016:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8006:13:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10516, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8023:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8006:23:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10518, "nodeType": "ExpressionStatement", "src": "8006:23:49" }, { "eventCall": { "arguments": [ { "id": 10520, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "8054:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10521, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8060:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10522, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8064:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10519, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "8045:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10523, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8045:26:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10524, "nodeType": "EmitStatement", "src": "8040:31:49" }, { "expression": { "arguments": [ { "id": 10526, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "8102:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10527, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8108:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10528, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8112:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10525, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "8082:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10529, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8082:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10530, "nodeType": "ExpressionStatement", "src": "8082:37:49" } ] }, "documentation": { "id": 10456, "nodeType": "StructuredDocumentation", "src": "7027:443:49", "text": " @dev Moves `amount` of tokens from `from` to `to`.\n This internal function is equivalent to {transfer}, and can be used to\n e.g. implement automatic token fees, slashing mechanisms, etc.\n Emits a {Transfer} event.\n Requirements:\n - `from` cannot be the zero address.\n - `to` cannot be the zero address.\n - `from` must have a balance of at least `amount`." }, "id": 10532, "implemented": true, "kind": "function", "modifiers": [], "name": "_transfer", "nameLocation": "7484:9:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10463, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10458, "mutability": "mutable", "name": "from", "nameLocation": "7511:4:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7503:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10457, "name": "address", "nodeType": "ElementaryTypeName", "src": "7503:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10460, "mutability": "mutable", "name": "to", "nameLocation": "7533:2:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7525:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10459, "name": "address", "nodeType": "ElementaryTypeName", "src": "7525:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10462, "mutability": "mutable", "name": "amount", "nameLocation": "7553:6:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7545:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10461, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7545:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "7493:72:49" }, "returnParameters": { "id": 10464, "nodeType": "ParameterList", "parameters": [], "src": "7583:0:49" }, "scope": 10771, "src": "7475:651:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10587, "nodeType": "Block", "src": "8467:324:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10546, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10541, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8485:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10544, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8504:1:49", "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": 10543, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8496:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10542, "name": "address", "nodeType": "ElementaryTypeName", "src": "8496:7:49", "typeDescriptions": {} } }, "id": 10545, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8496:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "8485:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206d696e7420746f20746865207a65726f2061646472657373", "id": 10547, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "8508:33:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_fc0b381caf0a47702017f3c4b358ebe3d3aff6c60ce819a8bf3ef5a95d4f202e", "typeString": "literal_string \"ERC20: mint to the zero address\"" }, "value": "ERC20: mint to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_fc0b381caf0a47702017f3c4b358ebe3d3aff6c60ce819a8bf3ef5a95d4f202e", "typeString": "literal_string \"ERC20: mint to the zero address\"" } ], "id": 10540, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "8477:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10548, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8477:65:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10549, "nodeType": "ExpressionStatement", "src": "8477:65:49" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10553, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8582:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10552, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8574:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10551, "name": "address", "nodeType": "ElementaryTypeName", "src": "8574:7:49", "typeDescriptions": {} } }, "id": 10554, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8574:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10555, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8586:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10556, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8595:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10550, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "8553:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10557, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8553:49:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10558, "nodeType": "ExpressionStatement", "src": "8553:49:49" }, { "expression": { "id": 10561, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10559, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "8613:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10560, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8629:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8613:22:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10562, "nodeType": "ExpressionStatement", "src": "8613:22:49" }, { "expression": { "id": 10567, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10563, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "8645:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10565, "indexExpression": { "id": 10564, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8655:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8645:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10566, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8667:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8645:28:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10568, "nodeType": "ExpressionStatement", "src": "8645:28:49" }, { "eventCall": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10572, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8705:1:49", "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": 10571, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8697:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10570, "name": "address", "nodeType": "ElementaryTypeName", "src": "8697:7:49", "typeDescriptions": {} } }, "id": 10573, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8697:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10574, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8709:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10575, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8718:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10569, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "8688:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10576, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8688:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10577, "nodeType": "EmitStatement", "src": "8683:42:49" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10581, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8764:1:49", "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": 10580, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8756:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10579, "name": "address", "nodeType": "ElementaryTypeName", "src": "8756:7:49", "typeDescriptions": {} } }, "id": 10582, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8756:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10583, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8768:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10584, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8777:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10578, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "8736:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10585, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8736:48:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10586, "nodeType": "ExpressionStatement", "src": "8736:48:49" } ] }, "documentation": { "id": 10533, "nodeType": "StructuredDocumentation", "src": "8132:265:49", "text": "@dev Creates `amount` tokens and assigns them to `account`, increasing\n the total supply.\n Emits a {Transfer} event with `from` set to the zero address.\n Requirements:\n - `account` cannot be the zero address." }, "id": 10588, "implemented": true, "kind": "function", "modifiers": [], "name": "_mint", "nameLocation": "8411:5:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10538, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10535, "mutability": "mutable", "name": "account", "nameLocation": "8425:7:49", "nodeType": "VariableDeclaration", "scope": 10588, "src": "8417:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10534, "name": "address", "nodeType": "ElementaryTypeName", "src": "8417:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10537, "mutability": "mutable", "name": "amount", "nameLocation": "8442:6:49", "nodeType": "VariableDeclaration", "scope": 10588, "src": "8434:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10536, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8434:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "8416:33:49" }, "returnParameters": { "id": 10539, "nodeType": "ParameterList", "parameters": [], "src": "8467:0:49" }, "scope": 10771, "src": "8402:389:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10659, "nodeType": "Block", "src": "9176:511:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10602, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10597, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9194:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10600, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9213:1:49", "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": 10599, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9205:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10598, "name": "address", "nodeType": "ElementaryTypeName", "src": "9205:7:49", "typeDescriptions": {} } }, "id": 10601, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9205:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "9194:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e2066726f6d20746865207a65726f2061646472657373", "id": 10603, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9217:35:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_b16788493b576042bb52c50ed56189e0b250db113c7bfb1c3897d25cf9632d7f", "typeString": "literal_string \"ERC20: burn from the zero address\"" }, "value": "ERC20: burn from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_b16788493b576042bb52c50ed56189e0b250db113c7bfb1c3897d25cf9632d7f", "typeString": "literal_string \"ERC20: burn from the zero address\"" } ], "id": 10596, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9186:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10604, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9186:67:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10605, "nodeType": "ExpressionStatement", "src": "9186:67:49" }, { "expression": { "arguments": [ { "id": 10607, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9285:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10610, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9302:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10609, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9294:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10608, "name": "address", "nodeType": "ElementaryTypeName", "src": "9294:7:49", "typeDescriptions": {} } }, "id": 10611, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9294:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10612, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9306:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10606, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "9264:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10613, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9264:49:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10614, "nodeType": "ExpressionStatement", "src": "9264:49:49" }, { "assignments": [ 10616 ], "declarations": [ { "constant": false, "id": 10616, "mutability": "mutable", "name": "accountBalance", "nameLocation": "9332:14:49", "nodeType": "VariableDeclaration", "scope": 10659, "src": "9324:22:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10615, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9324:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10620, "initialValue": { "baseExpression": { "id": 10617, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "9349:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10619, "indexExpression": { "id": 10618, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9359:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "9349:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "9324:43:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10624, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10622, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10616, "src": "9385:14:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10623, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9403:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9385:24:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e20616d6f756e7420657863656564732062616c616e6365", "id": 10625, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9411:36:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_149b126e7125232b4200af45303d04fba8b74653b1a295a6a561a528c33fefdd", "typeString": "literal_string \"ERC20: burn amount exceeds balance\"" }, "value": "ERC20: burn amount exceeds balance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_149b126e7125232b4200af45303d04fba8b74653b1a295a6a561a528c33fefdd", "typeString": "literal_string \"ERC20: burn amount exceeds balance\"" } ], "id": 10621, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9377:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10626, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9377:71:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10627, "nodeType": "ExpressionStatement", "src": "9377:71:49" }, { "id": 10636, "nodeType": "UncheckedBlock", "src": "9458:79:49", "statements": [ { "expression": { "id": 10634, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10628, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "9482:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10630, "indexExpression": { "id": 10629, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9492:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "9482:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10633, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10631, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10616, "src": "9503:14:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10632, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9520:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9503:23:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9482:44:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10635, "nodeType": "ExpressionStatement", "src": "9482:44:49" } ] }, { "expression": { "id": 10639, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10637, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "9546:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "-=", "rightHandSide": { "id": 10638, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9562:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9546:22:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10640, "nodeType": "ExpressionStatement", "src": "9546:22:49" }, { "eventCall": { "arguments": [ { "id": 10642, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9593:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10645, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9610:1:49", "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": 10644, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9602:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10643, "name": "address", "nodeType": "ElementaryTypeName", "src": "9602:7:49", "typeDescriptions": {} } }, "id": 10646, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9602:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10647, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9614:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10641, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "9584:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10648, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9584:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10649, "nodeType": "EmitStatement", "src": "9579:42:49" }, { "expression": { "arguments": [ { "id": 10651, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9652:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10654, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9669:1:49", "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": 10653, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9661:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10652, "name": "address", "nodeType": "ElementaryTypeName", "src": "9661:7:49", "typeDescriptions": {} } }, "id": 10655, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9661:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10656, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9673:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10650, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "9632:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10657, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9632:48:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10658, "nodeType": "ExpressionStatement", "src": "9632:48:49" } ] }, "documentation": { "id": 10589, "nodeType": "StructuredDocumentation", "src": "8797:309:49", "text": " @dev Destroys `amount` tokens from `account`, reducing the\n total supply.\n Emits a {Transfer} event with `to` set to the zero address.\n Requirements:\n - `account` cannot be the zero address.\n - `account` must have at least `amount` tokens." }, "id": 10660, "implemented": true, "kind": "function", "modifiers": [], "name": "_burn", "nameLocation": "9120:5:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10594, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10591, "mutability": "mutable", "name": "account", "nameLocation": "9134:7:49", "nodeType": "VariableDeclaration", "scope": 10660, "src": "9126:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10590, "name": "address", "nodeType": "ElementaryTypeName", "src": "9126:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10593, "mutability": "mutable", "name": "amount", "nameLocation": "9151:6:49", "nodeType": "VariableDeclaration", "scope": 10660, "src": "9143:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10592, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9143:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "9125:33:49" }, "returnParameters": { "id": 10595, "nodeType": "ParameterList", "parameters": [], "src": "9176:0:49" }, "scope": 10771, "src": "9111:576:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10704, "nodeType": "Block", "src": "10223:257:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10676, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10671, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10241:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10674, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10258:1:49", "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": 10673, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10250:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10672, "name": "address", "nodeType": "ElementaryTypeName", "src": "10250:7:49", "typeDescriptions": {} } }, "id": 10675, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10250:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10241:19:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f76652066726f6d20746865207a65726f2061646472657373", "id": 10677, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10262:38:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_c953f4879035ed60e766b34720f656aab5c697b141d924c283124ecedb91c208", "typeString": "literal_string \"ERC20: approve from the zero address\"" }, "value": "ERC20: approve from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_c953f4879035ed60e766b34720f656aab5c697b141d924c283124ecedb91c208", "typeString": "literal_string \"ERC20: approve from the zero address\"" } ], "id": 10670, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10233:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10678, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10233:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10679, "nodeType": "ExpressionStatement", "src": "10233:68:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10686, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10681, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10319:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10684, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10338:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10683, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10330:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10682, "name": "address", "nodeType": "ElementaryTypeName", "src": "10330:7:49", "typeDescriptions": {} } }, "id": 10685, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10330:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10319:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f766520746f20746865207a65726f2061646472657373", "id": 10687, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10342:36:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" }, "value": "ERC20: approve to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" } ], "id": 10680, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10311:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10688, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10311:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10689, "nodeType": "ExpressionStatement", "src": "10311:68:49" }, { "expression": { "id": 10696, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "baseExpression": { "id": 10690, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10207, "src": "10390:11:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 10693, "indexExpression": { "id": 10691, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10402:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "10390:18:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10694, "indexExpression": { "id": 10692, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10409:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "10390:27:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10695, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10667, "src": "10420:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10390:36:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10697, "nodeType": "ExpressionStatement", "src": "10390:36:49" }, { "eventCall": { "arguments": [ { "id": 10699, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10450:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10700, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10457:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10701, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10667, "src": "10466:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10698, "name": "Approval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10792, "src": "10441:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10702, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10441:32:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10703, "nodeType": "EmitStatement", "src": "10436:37:49" } ] }, "documentation": { "id": 10661, "nodeType": "StructuredDocumentation", "src": "9693:412:49", "text": " @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n This internal function is equivalent to `approve`, and can be used to\n e.g. set automatic allowances for certain subsystems, etc.\n Emits an {Approval} event.\n Requirements:\n - `owner` cannot be the zero address.\n - `spender` cannot be the zero address." }, "id": 10705, "implemented": true, "kind": "function", "modifiers": [], "name": "_approve", "nameLocation": "10119:8:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10668, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10663, "mutability": "mutable", "name": "owner", "nameLocation": "10145:5:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10137:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10662, "name": "address", "nodeType": "ElementaryTypeName", "src": "10137:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10665, "mutability": "mutable", "name": "spender", "nameLocation": "10168:7:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10160:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10664, "name": "address", "nodeType": "ElementaryTypeName", "src": "10160:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10667, "mutability": "mutable", "name": "amount", "nameLocation": "10193:6:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10185:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10666, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10185:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10127:78:49" }, "returnParameters": { "id": 10669, "nodeType": "ParameterList", "parameters": [], "src": "10223:0:49" }, "scope": 10771, "src": "10110:370:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10747, "nodeType": "Block", "src": "10881:321:49", "statements": [ { "assignments": [ 10716 ], "declarations": [ { "constant": false, "id": 10716, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "10899:16:49", "nodeType": "VariableDeclaration", "scope": 10747, "src": "10891:24:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10715, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10891:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10721, "initialValue": { "arguments": [ { "id": 10718, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10708, "src": "10928:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10719, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10710, "src": "10935:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10717, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "10918:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10720, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10918:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "10891:52:49" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10728, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10722, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "10957:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "expression": { "arguments": [ { "id": 10725, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10982:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": { "id": 10724, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10982:7:49", "typeDescriptions": {} } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" } ], "id": 10723, "name": "type", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967269, "src": "10977:4:49", "typeDescriptions": { "typeIdentifier": "t_function_metatype_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 10726, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10977:13:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_magic_meta_type_t_uint256", "typeString": "type(uint256)" } }, "id": 10727, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "max", "nodeType": "MemberAccess", "src": "10977:17:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10957:37:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 10746, "nodeType": "IfStatement", "src": "10953:243:49", "trueBody": { "id": 10745, "nodeType": "Block", "src": "10996:200:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10732, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10730, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "11018:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10731, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10712, "src": "11038:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11018:26:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20696e73756666696369656e7420616c6c6f77616e6365", "id": 10733, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11046:31:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_3b6607e091cba9325f958656d2b5e0622ab7dc0eac71a26ac788cb25bc19f4fe", "typeString": "literal_string \"ERC20: insufficient allowance\"" }, "value": "ERC20: insufficient allowance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_3b6607e091cba9325f958656d2b5e0622ab7dc0eac71a26ac788cb25bc19f4fe", "typeString": "literal_string \"ERC20: insufficient allowance\"" } ], "id": 10729, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "11010:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10734, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11010:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10735, "nodeType": "ExpressionStatement", "src": "11010:68:49" }, { "id": 10744, "nodeType": "UncheckedBlock", "src": "11092:94:49", "statements": [ { "expression": { "arguments": [ { "id": 10737, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10708, "src": "11129:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10738, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10710, "src": "11136:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10741, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10739, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "11145:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10740, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10712, "src": "11164:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11145:25:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10736, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "11120:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10742, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11120:51:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10743, "nodeType": "ExpressionStatement", "src": "11120:51:49" } ] } ] } } ] }, "documentation": { "id": 10706, "nodeType": "StructuredDocumentation", "src": "10486:270:49", "text": " @dev Updates `owner` s allowance for `spender` based on spent `amount`.\n Does not update the allowance amount in case of infinite allowance.\n Revert if not enough allowance is available.\n Might emit an {Approval} event." }, "id": 10748, "implemented": true, "kind": "function", "modifiers": [], "name": "_spendAllowance", "nameLocation": "10770:15:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10713, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10708, "mutability": "mutable", "name": "owner", "nameLocation": "10803:5:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10795:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10707, "name": "address", "nodeType": "ElementaryTypeName", "src": "10795:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10710, "mutability": "mutable", "name": "spender", "nameLocation": "10826:7:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10818:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10709, "name": "address", "nodeType": "ElementaryTypeName", "src": "10818:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10712, "mutability": "mutable", "name": "amount", "nameLocation": "10851:6:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10843:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10711, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10843:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10785:78:49" }, "returnParameters": { "id": 10714, "nodeType": "ParameterList", "parameters": [], "src": "10881:0:49" }, "scope": 10771, "src": "10761:441:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10758, "nodeType": "Block", "src": "11905:2:49", "statements": [] }, "documentation": { "id": 10749, "nodeType": "StructuredDocumentation", "src": "11208:573:49", "text": " @dev Hook that is called before any transfer of tokens. This includes\n minting and burning.\n Calling conditions:\n - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n will be transferred to `to`.\n - when `from` is zero, `amount` tokens will be minted for `to`.\n - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n - `from` and `to` are never both zero.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 10759, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nameLocation": "11795:20:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10756, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10751, "mutability": "mutable", "name": "from", "nameLocation": "11833:4:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11825:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10750, "name": "address", "nodeType": "ElementaryTypeName", "src": "11825:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10753, "mutability": "mutable", "name": "to", "nameLocation": "11855:2:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11847:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10752, "name": "address", "nodeType": "ElementaryTypeName", "src": "11847:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10755, "mutability": "mutable", "name": "amount", "nameLocation": "11875:6:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11867:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10754, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11867:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "11815:72:49" }, "returnParameters": { "id": 10757, "nodeType": "ParameterList", "parameters": [], "src": "11905:0:49" }, "scope": 10771, "src": "11786:121:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10769, "nodeType": "Block", "src": "12613:2:49", "statements": [] }, "documentation": { "id": 10760, "nodeType": "StructuredDocumentation", "src": "11913:577:49", "text": " @dev Hook that is called after any transfer of tokens. This includes\n minting and burning.\n Calling conditions:\n - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n has been transferred to `to`.\n - when `from` is zero, `amount` tokens have been minted for `to`.\n - when `to` is zero, `amount` of ``from``'s tokens have been burned.\n - `from` and `to` are never both zero.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 10770, "implemented": true, "kind": "function", "modifiers": [], "name": "_afterTokenTransfer", "nameLocation": "12504:19:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10767, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10762, "mutability": "mutable", "name": "from", "nameLocation": "12541:4:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12533:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10761, "name": "address", "nodeType": "ElementaryTypeName", "src": "12533:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10764, "mutability": "mutable", "name": "to", "nameLocation": "12563:2:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12555:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10763, "name": "address", "nodeType": "ElementaryTypeName", "src": "12555:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10766, "mutability": "mutable", "name": "amount", "nameLocation": "12583:6:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12575:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10765, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12575:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "12523:72:49" }, "returnParameters": { "id": 10768, "nodeType": "ParameterList", "parameters": [], "src": "12613:0:49" }, "scope": 10771, "src": "12495:120:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" } ], "scope": 10772, "src": "1403:11214:49", "usedErrors": [] } ], "src": "105:12513:49" }, "legacyAST": { "absolutePath": "@openzeppelin/contracts/token/ERC20/ERC20.sol", "exportedSymbols": { "Context": [ 11508 ], "ERC20": [ 10771 ], "IERC20": [ 10849 ], "IERC20Metadata": [ 10874 ] }, "id": 10772, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 10187, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "105:23:49" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 10188, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 10850, "src": "130:22:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol", "file": "./extensions/IERC20Metadata.sol", "id": 10189, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 10875, "src": "153:41:49", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Context.sol", "file": "../../utils/Context.sol", "id": 10190, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 10772, "sourceUnit": 11509, "src": "195:33:49", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "baseName": { "id": 10192, "name": "Context", "nodeType": "IdentifierPath", "referencedDeclaration": 11508, "src": "1421:7:49" }, "id": 10193, "nodeType": "InheritanceSpecifier", "src": "1421:7:49" }, { "baseName": { "id": 10194, "name": "IERC20", "nodeType": "IdentifierPath", "referencedDeclaration": 10849, "src": "1430:6:49" }, "id": 10195, "nodeType": "InheritanceSpecifier", "src": "1430:6:49" }, { "baseName": { "id": 10196, "name": "IERC20Metadata", "nodeType": "IdentifierPath", "referencedDeclaration": 10874, "src": "1438:14:49" }, "id": 10197, "nodeType": "InheritanceSpecifier", "src": "1438:14:49" } ], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 10191, "nodeType": "StructuredDocumentation", "src": "230:1172:49", "text": " @dev Implementation of the {IERC20} interface.\n This implementation is agnostic to the way tokens are created. This means\n that a supply mechanism has to be added in a derived contract using {_mint}.\n For a generic mechanism see {ERC20PresetMinterPauser}.\n TIP: For a detailed writeup see our guide\n https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n to implement supply mechanisms].\n We have followed general OpenZeppelin Contracts guidelines: functions revert\n instead returning `false` on failure. This behavior is nonetheless\n conventional and does not conflict with the expectations of ERC20\n applications.\n Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n This allows applications to reconstruct the allowance for all accounts just\n by listening to said events. Other implementations of the EIP may not emit\n these events, as it isn't required by the specification.\n Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n functions have been added to mitigate the well-known issues around setting\n allowances. See {IERC20-approve}." }, "fullyImplemented": true, "id": 10771, "linearizedBaseContracts": [ 10771, 10874, 10849, 11508 ], "name": "ERC20", "nameLocation": "1412:5:49", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "id": 10201, "mutability": "mutable", "name": "_balances", "nameLocation": "1495:9:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1459:45:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "typeName": { "id": 10200, "keyType": { "id": 10198, "name": "address", "nodeType": "ElementaryTypeName", "src": "1467:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1459:27:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 10199, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1478:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "visibility": "private" }, { "constant": false, "id": 10207, "mutability": "mutable", "name": "_allowances", "nameLocation": "1567:11:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1511:67:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "typeName": { "id": 10206, "keyType": { "id": 10202, "name": "address", "nodeType": "ElementaryTypeName", "src": "1519:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1511:47:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "valueType": { "id": 10205, "keyType": { "id": 10203, "name": "address", "nodeType": "ElementaryTypeName", "src": "1538:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1530:27:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 10204, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1549:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } } }, "visibility": "private" }, { "constant": false, "id": 10209, "mutability": "mutable", "name": "_totalSupply", "nameLocation": "1601:12:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1585:28:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10208, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1585:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "private" }, { "constant": false, "id": 10211, "mutability": "mutable", "name": "_name", "nameLocation": "1635:5:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1620:20:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 10210, "name": "string", "nodeType": "ElementaryTypeName", "src": "1620:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "constant": false, "id": 10213, "mutability": "mutable", "name": "_symbol", "nameLocation": "1661:7:49", "nodeType": "VariableDeclaration", "scope": 10771, "src": "1646:22:49", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 10212, "name": "string", "nodeType": "ElementaryTypeName", "src": "1646:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "body": { "id": 10229, "nodeType": "Block", "src": "2034:57:49", "statements": [ { "expression": { "id": 10223, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10221, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10211, "src": "2044:5:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10222, "name": "name_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10216, "src": "2052:5:49", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2044:13:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 10224, "nodeType": "ExpressionStatement", "src": "2044:13:49" }, { "expression": { "id": 10227, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10225, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10213, "src": "2067:7:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10226, "name": "symbol_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10218, "src": "2077:7:49", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2067:17:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 10228, "nodeType": "ExpressionStatement", "src": "2067:17:49" } ] }, "documentation": { "id": 10214, "nodeType": "StructuredDocumentation", "src": "1675:298:49", "text": " @dev Sets the values for {name} and {symbol}.\n The default value of {decimals} is 18. To select a different value for\n {decimals} you should overload it.\n All two of these values are immutable: they can only be set once during\n construction." }, "id": 10230, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nameLocation": "-1:-1:-1", "nodeType": "FunctionDefinition", "parameters": { "id": 10219, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10216, "mutability": "mutable", "name": "name_", "nameLocation": "2004:5:49", "nodeType": "VariableDeclaration", "scope": 10230, "src": "1990:19:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10215, "name": "string", "nodeType": "ElementaryTypeName", "src": "1990:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" }, { "constant": false, "id": 10218, "mutability": "mutable", "name": "symbol_", "nameLocation": "2025:7:49", "nodeType": "VariableDeclaration", "scope": 10230, "src": "2011:21:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10217, "name": "string", "nodeType": "ElementaryTypeName", "src": "2011:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "1989:44:49" }, "returnParameters": { "id": 10220, "nodeType": "ParameterList", "parameters": [], "src": "2034:0:49" }, "scope": 10771, "src": "1978:113:49", "stateMutability": "nonpayable", "virtual": false, "visibility": "public" }, { "baseFunctions": [ 10861 ], "body": { "id": 10239, "nodeType": "Block", "src": "2225:29:49", "statements": [ { "expression": { "id": 10237, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10211, "src": "2242:5:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 10236, "id": 10238, "nodeType": "Return", "src": "2235:12:49" } ] }, "documentation": { "id": 10231, "nodeType": "StructuredDocumentation", "src": "2097:54:49", "text": " @dev Returns the name of the token." }, "functionSelector": "06fdde03", "id": 10240, "implemented": true, "kind": "function", "modifiers": [], "name": "name", "nameLocation": "2165:4:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10233, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2192:8:49" }, "parameters": { "id": 10232, "nodeType": "ParameterList", "parameters": [], "src": "2169:2:49" }, "returnParameters": { "id": 10236, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10235, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10240, "src": "2210:13:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10234, "name": "string", "nodeType": "ElementaryTypeName", "src": "2210:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2209:15:49" }, "scope": 10771, "src": "2156:98:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10867 ], "body": { "id": 10249, "nodeType": "Block", "src": "2438:31:49", "statements": [ { "expression": { "id": 10247, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10213, "src": "2455:7:49", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 10246, "id": 10248, "nodeType": "Return", "src": "2448:14:49" } ] }, "documentation": { "id": 10241, "nodeType": "StructuredDocumentation", "src": "2260:102:49", "text": " @dev Returns the symbol of the token, usually a shorter version of the\n name." }, "functionSelector": "95d89b41", "id": 10250, "implemented": true, "kind": "function", "modifiers": [], "name": "symbol", "nameLocation": "2376:6:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10243, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2405:8:49" }, "parameters": { "id": 10242, "nodeType": "ParameterList", "parameters": [], "src": "2382:2:49" }, "returnParameters": { "id": 10246, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10245, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10250, "src": "2423:13:49", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 10244, "name": "string", "nodeType": "ElementaryTypeName", "src": "2423:6:49", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2422:15:49" }, "scope": 10771, "src": "2367:102:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10873 ], "body": { "id": 10259, "nodeType": "Block", "src": "3158:26:49", "statements": [ { "expression": { "hexValue": "3138", "id": 10257, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "3175:2:49", "typeDescriptions": { "typeIdentifier": "t_rational_18_by_1", "typeString": "int_const 18" }, "value": "18" }, "functionReturnParameters": 10256, "id": 10258, "nodeType": "Return", "src": "3168:9:49" } ] }, "documentation": { "id": 10251, "nodeType": "StructuredDocumentation", "src": "2475:613:49", "text": " @dev Returns the number of decimals used to get its user representation.\n For example, if `decimals` equals `2`, a balance of `505` tokens should\n be displayed to a user as `5.05` (`505 / 10 ** 2`).\n Tokens usually opt for a value of 18, imitating the relationship between\n Ether and Wei. This is the value {ERC20} uses, unless this function is\n overridden;\n NOTE: This information is only used for _display_ purposes: it in\n no way affects any of the arithmetic of the contract, including\n {IERC20-balanceOf} and {IERC20-transfer}." }, "functionSelector": "313ce567", "id": 10260, "implemented": true, "kind": "function", "modifiers": [], "name": "decimals", "nameLocation": "3102:8:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10253, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3133:8:49" }, "parameters": { "id": 10252, "nodeType": "ParameterList", "parameters": [], "src": "3110:2:49" }, "returnParameters": { "id": 10256, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10255, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10260, "src": "3151:5:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 10254, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "3151:5:49", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "visibility": "internal" } ], "src": "3150:7:49" }, "scope": 10771, "src": "3093:91:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10798 ], "body": { "id": 10269, "nodeType": "Block", "src": "3314:36:49", "statements": [ { "expression": { "id": 10267, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "3331:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10266, "id": 10268, "nodeType": "Return", "src": "3324:19:49" } ] }, "documentation": { "id": 10261, "nodeType": "StructuredDocumentation", "src": "3190:49:49", "text": " @dev See {IERC20-totalSupply}." }, "functionSelector": "18160ddd", "id": 10270, "implemented": true, "kind": "function", "modifiers": [], "name": "totalSupply", "nameLocation": "3253:11:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10263, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3287:8:49" }, "parameters": { "id": 10262, "nodeType": "ParameterList", "parameters": [], "src": "3264:2:49" }, "returnParameters": { "id": 10266, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10265, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10270, "src": "3305:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10264, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3305:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3304:9:49" }, "scope": 10771, "src": "3244:106:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10806 ], "body": { "id": 10283, "nodeType": "Block", "src": "3491:42:49", "statements": [ { "expression": { "baseExpression": { "id": 10279, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "3508:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10281, "indexExpression": { "id": 10280, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10273, "src": "3518:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "3508:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10278, "id": 10282, "nodeType": "Return", "src": "3501:25:49" } ] }, "documentation": { "id": 10271, "nodeType": "StructuredDocumentation", "src": "3356:47:49", "text": " @dev See {IERC20-balanceOf}." }, "functionSelector": "70a08231", "id": 10284, "implemented": true, "kind": "function", "modifiers": [], "name": "balanceOf", "nameLocation": "3417:9:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10275, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3464:8:49" }, "parameters": { "id": 10274, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10273, "mutability": "mutable", "name": "account", "nameLocation": "3435:7:49", "nodeType": "VariableDeclaration", "scope": 10284, "src": "3427:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10272, "name": "address", "nodeType": "ElementaryTypeName", "src": "3427:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3426:17:49" }, "returnParameters": { "id": 10278, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10277, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10284, "src": "3482:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10276, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3482:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3481:9:49" }, "scope": 10771, "src": "3408:125:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10816 ], "body": { "id": 10308, "nodeType": "Block", "src": "3814:104:49", "statements": [ { "assignments": [ 10296 ], "declarations": [ { "constant": false, "id": 10296, "mutability": "mutable", "name": "owner", "nameLocation": "3832:5:49", "nodeType": "VariableDeclaration", "scope": 10308, "src": "3824:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10295, "name": "address", "nodeType": "ElementaryTypeName", "src": "3824:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10299, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10297, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "3840:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10298, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3840:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "3824:28:49" }, { "expression": { "arguments": [ { "id": 10301, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10296, "src": "3872:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10302, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10287, "src": "3879:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10303, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10289, "src": "3883:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10300, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10532, "src": "3862:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10304, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3862:28:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10305, "nodeType": "ExpressionStatement", "src": "3862:28:49" }, { "expression": { "hexValue": "74727565", "id": 10306, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "3907:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10294, "id": 10307, "nodeType": "Return", "src": "3900:11:49" } ] }, "documentation": { "id": 10285, "nodeType": "StructuredDocumentation", "src": "3539:185:49", "text": " @dev See {IERC20-transfer}.\n Requirements:\n - `to` cannot be the zero address.\n - the caller must have a balance of at least `amount`." }, "functionSelector": "a9059cbb", "id": 10309, "implemented": true, "kind": "function", "modifiers": [], "name": "transfer", "nameLocation": "3738:8:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10291, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3790:8:49" }, "parameters": { "id": 10290, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10287, "mutability": "mutable", "name": "to", "nameLocation": "3755:2:49", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3747:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10286, "name": "address", "nodeType": "ElementaryTypeName", "src": "3747:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10289, "mutability": "mutable", "name": "amount", "nameLocation": "3767:6:49", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3759:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10288, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3759:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3746:28:49" }, "returnParameters": { "id": 10294, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10293, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10309, "src": "3808:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10292, "name": "bool", "nodeType": "ElementaryTypeName", "src": "3808:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "3807:6:49" }, "scope": 10771, "src": "3729:189:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10826 ], "body": { "id": 10326, "nodeType": "Block", "src": "4074:51:49", "statements": [ { "expression": { "baseExpression": { "baseExpression": { "id": 10320, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10207, "src": "4091:11:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 10322, "indexExpression": { "id": 10321, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10312, "src": "4103:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:18:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10324, "indexExpression": { "id": 10323, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10314, "src": "4110:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:27:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 10319, "id": 10325, "nodeType": "Return", "src": "4084:34:49" } ] }, "documentation": { "id": 10310, "nodeType": "StructuredDocumentation", "src": "3924:47:49", "text": " @dev See {IERC20-allowance}." }, "functionSelector": "dd62ed3e", "id": 10327, "implemented": true, "kind": "function", "modifiers": [], "name": "allowance", "nameLocation": "3985:9:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10316, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4047:8:49" }, "parameters": { "id": 10315, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10312, "mutability": "mutable", "name": "owner", "nameLocation": "4003:5:49", "nodeType": "VariableDeclaration", "scope": 10327, "src": "3995:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10311, "name": "address", "nodeType": "ElementaryTypeName", "src": "3995:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10314, "mutability": "mutable", "name": "spender", "nameLocation": "4018:7:49", "nodeType": "VariableDeclaration", "scope": 10327, "src": "4010:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10313, "name": "address", "nodeType": "ElementaryTypeName", "src": "4010:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3994:32:49" }, "returnParameters": { "id": 10319, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10318, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10327, "src": "4065:7:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10317, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4065:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4064:9:49" }, "scope": 10771, "src": "3976:149:49", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10836 ], "body": { "id": 10351, "nodeType": "Block", "src": "4522:108:49", "statements": [ { "assignments": [ 10339 ], "declarations": [ { "constant": false, "id": 10339, "mutability": "mutable", "name": "owner", "nameLocation": "4540:5:49", "nodeType": "VariableDeclaration", "scope": 10351, "src": "4532:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10338, "name": "address", "nodeType": "ElementaryTypeName", "src": "4532:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10342, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10340, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "4548:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10341, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4548:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "4532:28:49" }, { "expression": { "arguments": [ { "id": 10344, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10339, "src": "4579:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10345, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10330, "src": "4586:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10346, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10332, "src": "4595:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10343, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "4570:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10347, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "4570:32:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10348, "nodeType": "ExpressionStatement", "src": "4570:32:49" }, { "expression": { "hexValue": "74727565", "id": 10349, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "4619:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10337, "id": 10350, "nodeType": "Return", "src": "4612:11:49" } ] }, "documentation": { "id": 10328, "nodeType": "StructuredDocumentation", "src": "4131:297:49", "text": " @dev See {IERC20-approve}.\n NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\n `transferFrom`. This is semantically equivalent to an infinite approval.\n Requirements:\n - `spender` cannot be the zero address." }, "functionSelector": "095ea7b3", "id": 10352, "implemented": true, "kind": "function", "modifiers": [], "name": "approve", "nameLocation": "4442:7:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10334, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4498:8:49" }, "parameters": { "id": 10333, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10330, "mutability": "mutable", "name": "spender", "nameLocation": "4458:7:49", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4450:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10329, "name": "address", "nodeType": "ElementaryTypeName", "src": "4450:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10332, "mutability": "mutable", "name": "amount", "nameLocation": "4475:6:49", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4467:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10331, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4467:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4449:33:49" }, "returnParameters": { "id": 10337, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10336, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10352, "src": "4516:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10335, "name": "bool", "nodeType": "ElementaryTypeName", "src": "4516:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "4515:6:49" }, "scope": 10771, "src": "4433:197:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 10848 ], "body": { "id": 10384, "nodeType": "Block", "src": "5325:153:49", "statements": [ { "assignments": [ 10366 ], "declarations": [ { "constant": false, "id": 10366, "mutability": "mutable", "name": "spender", "nameLocation": "5343:7:49", "nodeType": "VariableDeclaration", "scope": 10384, "src": "5335:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10365, "name": "address", "nodeType": "ElementaryTypeName", "src": "5335:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10369, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10367, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "5353:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10368, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5353:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5335:30:49" }, { "expression": { "arguments": [ { "id": 10371, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10355, "src": "5391:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10372, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10366, "src": "5397:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10373, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10359, "src": "5406:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10370, "name": "_spendAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10748, "src": "5375:15:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10374, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5375:38:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10375, "nodeType": "ExpressionStatement", "src": "5375:38:49" }, { "expression": { "arguments": [ { "id": 10377, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10355, "src": "5433:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10378, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10357, "src": "5439:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10379, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10359, "src": "5443:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10376, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10532, "src": "5423:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10380, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5423:27:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10381, "nodeType": "ExpressionStatement", "src": "5423:27:49" }, { "expression": { "hexValue": "74727565", "id": 10382, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "5467:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10364, "id": 10383, "nodeType": "Return", "src": "5460:11:49" } ] }, "documentation": { "id": 10353, "nodeType": "StructuredDocumentation", "src": "4636:551:49", "text": " @dev See {IERC20-transferFrom}.\n Emits an {Approval} event indicating the updated allowance. This is not\n required by the EIP. See the note at the beginning of {ERC20}.\n NOTE: Does not update the allowance if the current allowance\n is the maximum `uint256`.\n Requirements:\n - `from` and `to` cannot be the zero address.\n - `from` must have a balance of at least `amount`.\n - the caller must have allowance for ``from``'s tokens of at least\n `amount`." }, "functionSelector": "23b872dd", "id": 10385, "implemented": true, "kind": "function", "modifiers": [], "name": "transferFrom", "nameLocation": "5201:12:49", "nodeType": "FunctionDefinition", "overrides": { "id": 10361, "nodeType": "OverrideSpecifier", "overrides": [], "src": "5301:8:49" }, "parameters": { "id": 10360, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10355, "mutability": "mutable", "name": "from", "nameLocation": "5231:4:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5223:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10354, "name": "address", "nodeType": "ElementaryTypeName", "src": "5223:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10357, "mutability": "mutable", "name": "to", "nameLocation": "5253:2:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5245:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10356, "name": "address", "nodeType": "ElementaryTypeName", "src": "5245:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10359, "mutability": "mutable", "name": "amount", "nameLocation": "5273:6:49", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5265:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10358, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5265:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5213:72:49" }, "returnParameters": { "id": 10364, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10363, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10385, "src": "5319:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10362, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5319:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5318:6:49" }, "scope": 10771, "src": "5192:286:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10413, "nodeType": "Block", "src": "5967:140:49", "statements": [ { "assignments": [ 10396 ], "declarations": [ { "constant": false, "id": 10396, "mutability": "mutable", "name": "owner", "nameLocation": "5985:5:49", "nodeType": "VariableDeclaration", "scope": 10413, "src": "5977:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10395, "name": "address", "nodeType": "ElementaryTypeName", "src": "5977:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10399, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10397, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "5993:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10398, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "5993:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5977:28:49" }, { "expression": { "arguments": [ { "id": 10401, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10396, "src": "6024:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10402, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10388, "src": "6031:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10408, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 10404, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10396, "src": "6050:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10405, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10388, "src": "6057:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10403, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "6040:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10406, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6040:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "id": 10407, "name": "addedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10390, "src": "6068:10:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6040:38:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10400, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "6015:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10409, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6015:64:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10410, "nodeType": "ExpressionStatement", "src": "6015:64:49" }, { "expression": { "hexValue": "74727565", "id": 10411, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "6096:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10394, "id": 10412, "nodeType": "Return", "src": "6089:11:49" } ] }, "documentation": { "id": 10386, "nodeType": "StructuredDocumentation", "src": "5484:384:49", "text": " @dev Atomically increases the allowance granted to `spender` by the caller.\n This is an alternative to {approve} that can be used as a mitigation for\n problems described in {IERC20-approve}.\n Emits an {Approval} event indicating the updated allowance.\n Requirements:\n - `spender` cannot be the zero address." }, "functionSelector": "39509351", "id": 10414, "implemented": true, "kind": "function", "modifiers": [], "name": "increaseAllowance", "nameLocation": "5882:17:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10391, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10388, "mutability": "mutable", "name": "spender", "nameLocation": "5908:7:49", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5900:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10387, "name": "address", "nodeType": "ElementaryTypeName", "src": "5900:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10390, "mutability": "mutable", "name": "addedValue", "nameLocation": "5925:10:49", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5917:18:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10389, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5917:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5899:37:49" }, "returnParameters": { "id": 10394, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10393, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10414, "src": "5961:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10392, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5961:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5960:6:49" }, "scope": 10771, "src": "5873:234:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10454, "nodeType": "Block", "src": "6693:328:49", "statements": [ { "assignments": [ 10425 ], "declarations": [ { "constant": false, "id": 10425, "mutability": "mutable", "name": "owner", "nameLocation": "6711:5:49", "nodeType": "VariableDeclaration", "scope": 10454, "src": "6703:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10424, "name": "address", "nodeType": "ElementaryTypeName", "src": "6703:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 10428, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 10426, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 11498, "src": "6719:10:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 10427, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6719:12:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "6703:28:49" }, { "assignments": [ 10430 ], "declarations": [ { "constant": false, "id": 10430, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "6749:16:49", "nodeType": "VariableDeclaration", "scope": 10454, "src": "6741:24:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10429, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6741:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10435, "initialValue": { "arguments": [ { "id": 10432, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10425, "src": "6778:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10433, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10417, "src": "6785:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10431, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "6768:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10434, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6768:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "6741:52:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10439, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10437, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10430, "src": "6811:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10438, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10419, "src": "6831:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6811:35:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 10440, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "6848:39:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_f8b476f7d28209d77d4a4ac1fe36b9f8259aa1bb6bddfa6e89de7e51615cf8a8", "typeString": "literal_string \"ERC20: decreased allowance below zero\"" }, "value": "ERC20: decreased allowance below zero" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_f8b476f7d28209d77d4a4ac1fe36b9f8259aa1bb6bddfa6e89de7e51615cf8a8", "typeString": "literal_string \"ERC20: decreased allowance below zero\"" } ], "id": 10436, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "6803:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10441, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6803:85:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10442, "nodeType": "ExpressionStatement", "src": "6803:85:49" }, { "id": 10451, "nodeType": "UncheckedBlock", "src": "6898:95:49", "statements": [ { "expression": { "arguments": [ { "id": 10444, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10425, "src": "6931:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10445, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10417, "src": "6938:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10448, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10446, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10430, "src": "6947:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10447, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10419, "src": "6966:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6947:34:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10443, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "6922:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10449, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "6922:60:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10450, "nodeType": "ExpressionStatement", "src": "6922:60:49" } ] }, { "expression": { "hexValue": "74727565", "id": 10452, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "7010:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 10423, "id": 10453, "nodeType": "Return", "src": "7003:11:49" } ] }, "documentation": { "id": 10415, "nodeType": "StructuredDocumentation", "src": "6113:476:49", "text": " @dev Atomically decreases the allowance granted to `spender` by the caller.\n This is an alternative to {approve} that can be used as a mitigation for\n problems described in {IERC20-approve}.\n Emits an {Approval} event indicating the updated allowance.\n Requirements:\n - `spender` cannot be the zero address.\n - `spender` must have allowance for the caller of at least\n `subtractedValue`." }, "functionSelector": "a457c2d7", "id": 10455, "implemented": true, "kind": "function", "modifiers": [], "name": "decreaseAllowance", "nameLocation": "6603:17:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10420, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10417, "mutability": "mutable", "name": "spender", "nameLocation": "6629:7:49", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6621:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10416, "name": "address", "nodeType": "ElementaryTypeName", "src": "6621:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10419, "mutability": "mutable", "name": "subtractedValue", "nameLocation": "6646:15:49", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6638:23:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10418, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6638:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "6620:42:49" }, "returnParameters": { "id": 10423, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10422, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 10455, "src": "6687:4:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 10421, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6687:4:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "6686:6:49" }, "scope": 10771, "src": "6594:427:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 10531, "nodeType": "Block", "src": "7583:543:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10471, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10466, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7601:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10469, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7617:1:49", "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": 10468, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7609:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10467, "name": "address", "nodeType": "ElementaryTypeName", "src": "7609:7:49", "typeDescriptions": {} } }, "id": 10470, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7609:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7601:18:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e736665722066726f6d20746865207a65726f2061646472657373", "id": 10472, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7621:39:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_baecc556b46f4ed0f2b4cb599d60785ac8563dd2dc0a5bf12edea1c39e5e1fea", "typeString": "literal_string \"ERC20: transfer from the zero address\"" }, "value": "ERC20: transfer from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_baecc556b46f4ed0f2b4cb599d60785ac8563dd2dc0a5bf12edea1c39e5e1fea", "typeString": "literal_string \"ERC20: transfer from the zero address\"" } ], "id": 10465, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7593:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10473, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7593:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10474, "nodeType": "ExpressionStatement", "src": "7593:68:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10481, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10476, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "7679:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10479, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7693:1:49", "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": 10478, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7685:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10477, "name": "address", "nodeType": "ElementaryTypeName", "src": "7685:7:49", "typeDescriptions": {} } }, "id": 10480, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7685:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7679:16:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220746f20746865207a65726f2061646472657373", "id": 10482, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7697:37:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" }, "value": "ERC20: transfer to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" } ], "id": 10475, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7671:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10483, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7671:64:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10484, "nodeType": "ExpressionStatement", "src": "7671:64:49" }, { "expression": { "arguments": [ { "id": 10486, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7767:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10487, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "7773:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10488, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7777:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10485, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "7746:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10489, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7746:38:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10490, "nodeType": "ExpressionStatement", "src": "7746:38:49" }, { "assignments": [ 10492 ], "declarations": [ { "constant": false, "id": 10492, "mutability": "mutable", "name": "fromBalance", "nameLocation": "7803:11:49", "nodeType": "VariableDeclaration", "scope": 10531, "src": "7795:19:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10491, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7795:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10496, "initialValue": { "baseExpression": { "id": 10493, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "7817:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10495, "indexExpression": { "id": 10494, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7827:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "7817:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "7795:37:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10500, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10498, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10492, "src": "7850:11:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10499, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7865:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7850:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220616d6f756e7420657863656564732062616c616e6365", "id": 10501, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7873:40:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_4107e8a8b9e94bf8ff83080ddec1c0bffe897ebc2241b89d44f66b3d274088b6", "typeString": "literal_string \"ERC20: transfer amount exceeds balance\"" }, "value": "ERC20: transfer amount exceeds balance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_4107e8a8b9e94bf8ff83080ddec1c0bffe897ebc2241b89d44f66b3d274088b6", "typeString": "literal_string \"ERC20: transfer amount exceeds balance\"" } ], "id": 10497, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7842:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10502, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "7842:72:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10503, "nodeType": "ExpressionStatement", "src": "7842:72:49" }, { "id": 10512, "nodeType": "UncheckedBlock", "src": "7924:73:49", "statements": [ { "expression": { "id": 10510, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10504, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "7948:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10506, "indexExpression": { "id": 10505, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "7958:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "7948:15:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10509, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10507, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10492, "src": "7966:11:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10508, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "7980:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7966:20:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7948:38:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10511, "nodeType": "ExpressionStatement", "src": "7948:38:49" } ] }, { "expression": { "id": 10517, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10513, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "8006:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10515, "indexExpression": { "id": 10514, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8016:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8006:13:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10516, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8023:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8006:23:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10518, "nodeType": "ExpressionStatement", "src": "8006:23:49" }, { "eventCall": { "arguments": [ { "id": 10520, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "8054:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10521, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8060:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10522, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8064:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10519, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "8045:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10523, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8045:26:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10524, "nodeType": "EmitStatement", "src": "8040:31:49" }, { "expression": { "arguments": [ { "id": 10526, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10458, "src": "8102:4:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10527, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10460, "src": "8108:2:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10528, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10462, "src": "8112:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10525, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "8082:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10529, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8082:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10530, "nodeType": "ExpressionStatement", "src": "8082:37:49" } ] }, "documentation": { "id": 10456, "nodeType": "StructuredDocumentation", "src": "7027:443:49", "text": " @dev Moves `amount` of tokens from `from` to `to`.\n This internal function is equivalent to {transfer}, and can be used to\n e.g. implement automatic token fees, slashing mechanisms, etc.\n Emits a {Transfer} event.\n Requirements:\n - `from` cannot be the zero address.\n - `to` cannot be the zero address.\n - `from` must have a balance of at least `amount`." }, "id": 10532, "implemented": true, "kind": "function", "modifiers": [], "name": "_transfer", "nameLocation": "7484:9:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10463, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10458, "mutability": "mutable", "name": "from", "nameLocation": "7511:4:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7503:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10457, "name": "address", "nodeType": "ElementaryTypeName", "src": "7503:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10460, "mutability": "mutable", "name": "to", "nameLocation": "7533:2:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7525:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10459, "name": "address", "nodeType": "ElementaryTypeName", "src": "7525:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10462, "mutability": "mutable", "name": "amount", "nameLocation": "7553:6:49", "nodeType": "VariableDeclaration", "scope": 10532, "src": "7545:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10461, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7545:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "7493:72:49" }, "returnParameters": { "id": 10464, "nodeType": "ParameterList", "parameters": [], "src": "7583:0:49" }, "scope": 10771, "src": "7475:651:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10587, "nodeType": "Block", "src": "8467:324:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10546, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10541, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8485:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10544, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8504:1:49", "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": 10543, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8496:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10542, "name": "address", "nodeType": "ElementaryTypeName", "src": "8496:7:49", "typeDescriptions": {} } }, "id": 10545, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8496:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "8485:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206d696e7420746f20746865207a65726f2061646472657373", "id": 10547, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "8508:33:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_fc0b381caf0a47702017f3c4b358ebe3d3aff6c60ce819a8bf3ef5a95d4f202e", "typeString": "literal_string \"ERC20: mint to the zero address\"" }, "value": "ERC20: mint to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_fc0b381caf0a47702017f3c4b358ebe3d3aff6c60ce819a8bf3ef5a95d4f202e", "typeString": "literal_string \"ERC20: mint to the zero address\"" } ], "id": 10540, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "8477:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10548, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8477:65:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10549, "nodeType": "ExpressionStatement", "src": "8477:65:49" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10553, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8582:1:49", "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": 10552, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8574:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10551, "name": "address", "nodeType": "ElementaryTypeName", "src": "8574:7:49", "typeDescriptions": {} } }, "id": 10554, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8574:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10555, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8586:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10556, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8595:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10550, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "8553:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10557, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8553:49:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10558, "nodeType": "ExpressionStatement", "src": "8553:49:49" }, { "expression": { "id": 10561, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10559, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "8613:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10560, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8629:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8613:22:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10562, "nodeType": "ExpressionStatement", "src": "8613:22:49" }, { "expression": { "id": 10567, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10563, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "8645:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10565, "indexExpression": { "id": 10564, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8655:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8645:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 10566, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8667:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8645:28:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10568, "nodeType": "ExpressionStatement", "src": "8645:28:49" }, { "eventCall": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10572, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8705:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10571, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8697:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10570, "name": "address", "nodeType": "ElementaryTypeName", "src": "8697:7:49", "typeDescriptions": {} } }, "id": 10573, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8697:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10574, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8709:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10575, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8718:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10569, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "8688:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10576, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8688:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10577, "nodeType": "EmitStatement", "src": "8683:42:49" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 10581, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8764:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10580, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8756:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10579, "name": "address", "nodeType": "ElementaryTypeName", "src": "8756:7:49", "typeDescriptions": {} } }, "id": 10582, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8756:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10583, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10535, "src": "8768:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10584, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10537, "src": "8777:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10578, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "8736:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10585, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "8736:48:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10586, "nodeType": "ExpressionStatement", "src": "8736:48:49" } ] }, "documentation": { "id": 10533, "nodeType": "StructuredDocumentation", "src": "8132:265:49", "text": "@dev Creates `amount` tokens and assigns them to `account`, increasing\n the total supply.\n Emits a {Transfer} event with `from` set to the zero address.\n Requirements:\n - `account` cannot be the zero address." }, "id": 10588, "implemented": true, "kind": "function", "modifiers": [], "name": "_mint", "nameLocation": "8411:5:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10538, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10535, "mutability": "mutable", "name": "account", "nameLocation": "8425:7:49", "nodeType": "VariableDeclaration", "scope": 10588, "src": "8417:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10534, "name": "address", "nodeType": "ElementaryTypeName", "src": "8417:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10537, "mutability": "mutable", "name": "amount", "nameLocation": "8442:6:49", "nodeType": "VariableDeclaration", "scope": 10588, "src": "8434:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10536, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8434:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "8416:33:49" }, "returnParameters": { "id": 10539, "nodeType": "ParameterList", "parameters": [], "src": "8467:0:49" }, "scope": 10771, "src": "8402:389:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10659, "nodeType": "Block", "src": "9176:511:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10602, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10597, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9194:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10600, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9213:1:49", "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": 10599, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9205:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10598, "name": "address", "nodeType": "ElementaryTypeName", "src": "9205:7:49", "typeDescriptions": {} } }, "id": 10601, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9205:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "9194:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e2066726f6d20746865207a65726f2061646472657373", "id": 10603, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9217:35:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_b16788493b576042bb52c50ed56189e0b250db113c7bfb1c3897d25cf9632d7f", "typeString": "literal_string \"ERC20: burn from the zero address\"" }, "value": "ERC20: burn from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_b16788493b576042bb52c50ed56189e0b250db113c7bfb1c3897d25cf9632d7f", "typeString": "literal_string \"ERC20: burn from the zero address\"" } ], "id": 10596, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9186:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10604, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9186:67:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10605, "nodeType": "ExpressionStatement", "src": "9186:67:49" }, { "expression": { "arguments": [ { "id": 10607, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9285:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10610, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9302:1:49", "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": 10609, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9294:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10608, "name": "address", "nodeType": "ElementaryTypeName", "src": "9294:7:49", "typeDescriptions": {} } }, "id": 10611, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9294:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10612, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9306:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10606, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10759, "src": "9264:20:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10613, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9264:49:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10614, "nodeType": "ExpressionStatement", "src": "9264:49:49" }, { "assignments": [ 10616 ], "declarations": [ { "constant": false, "id": 10616, "mutability": "mutable", "name": "accountBalance", "nameLocation": "9332:14:49", "nodeType": "VariableDeclaration", "scope": 10659, "src": "9324:22:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10615, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9324:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10620, "initialValue": { "baseExpression": { "id": 10617, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "9349:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10619, "indexExpression": { "id": 10618, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9359:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "9349:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "9324:43:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10624, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10622, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10616, "src": "9385:14:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10623, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9403:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9385:24:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e20616d6f756e7420657863656564732062616c616e6365", "id": 10625, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9411:36:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_149b126e7125232b4200af45303d04fba8b74653b1a295a6a561a528c33fefdd", "typeString": "literal_string \"ERC20: burn amount exceeds balance\"" }, "value": "ERC20: burn amount exceeds balance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_149b126e7125232b4200af45303d04fba8b74653b1a295a6a561a528c33fefdd", "typeString": "literal_string \"ERC20: burn amount exceeds balance\"" } ], "id": 10621, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9377:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10626, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9377:71:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10627, "nodeType": "ExpressionStatement", "src": "9377:71:49" }, { "id": 10636, "nodeType": "UncheckedBlock", "src": "9458:79:49", "statements": [ { "expression": { "id": 10634, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 10628, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10201, "src": "9482:9:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10630, "indexExpression": { "id": 10629, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9492:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "9482:18:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10633, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10631, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10616, "src": "9503:14:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10632, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9520:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9503:23:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9482:44:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10635, "nodeType": "ExpressionStatement", "src": "9482:44:49" } ] }, { "expression": { "id": 10639, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 10637, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10209, "src": "9546:12:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "-=", "rightHandSide": { "id": 10638, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9562:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9546:22:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10640, "nodeType": "ExpressionStatement", "src": "9546:22:49" }, { "eventCall": { "arguments": [ { "id": 10642, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9593:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10645, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9610:1:49", "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": 10644, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9602:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10643, "name": "address", "nodeType": "ElementaryTypeName", "src": "9602:7:49", "typeDescriptions": {} } }, "id": 10646, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9602:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10647, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9614:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10641, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10783, "src": "9584:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10648, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9584:37:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10649, "nodeType": "EmitStatement", "src": "9579:42:49" }, { "expression": { "arguments": [ { "id": 10651, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10591, "src": "9652:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 10654, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9669:1:49", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 10653, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9661:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10652, "name": "address", "nodeType": "ElementaryTypeName", "src": "9661:7:49", "typeDescriptions": {} } }, "id": 10655, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9661:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10656, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10593, "src": "9673:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10650, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10770, "src": "9632:19:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10657, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "9632:48:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10658, "nodeType": "ExpressionStatement", "src": "9632:48:49" } ] }, "documentation": { "id": 10589, "nodeType": "StructuredDocumentation", "src": "8797:309:49", "text": " @dev Destroys `amount` tokens from `account`, reducing the\n total supply.\n Emits a {Transfer} event with `to` set to the zero address.\n Requirements:\n - `account` cannot be the zero address.\n - `account` must have at least `amount` tokens." }, "id": 10660, "implemented": true, "kind": "function", "modifiers": [], "name": "_burn", "nameLocation": "9120:5:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10594, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10591, "mutability": "mutable", "name": "account", "nameLocation": "9134:7:49", "nodeType": "VariableDeclaration", "scope": 10660, "src": "9126:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10590, "name": "address", "nodeType": "ElementaryTypeName", "src": "9126:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10593, "mutability": "mutable", "name": "amount", "nameLocation": "9151:6:49", "nodeType": "VariableDeclaration", "scope": 10660, "src": "9143:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10592, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9143:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "9125:33:49" }, "returnParameters": { "id": 10595, "nodeType": "ParameterList", "parameters": [], "src": "9176:0:49" }, "scope": 10771, "src": "9111:576:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10704, "nodeType": "Block", "src": "10223:257:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10676, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10671, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10241:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10674, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10258:1:49", "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": 10673, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10250:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10672, "name": "address", "nodeType": "ElementaryTypeName", "src": "10250:7:49", "typeDescriptions": {} } }, "id": 10675, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10250:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10241:19:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f76652066726f6d20746865207a65726f2061646472657373", "id": 10677, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10262:38:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_c953f4879035ed60e766b34720f656aab5c697b141d924c283124ecedb91c208", "typeString": "literal_string \"ERC20: approve from the zero address\"" }, "value": "ERC20: approve from the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_c953f4879035ed60e766b34720f656aab5c697b141d924c283124ecedb91c208", "typeString": "literal_string \"ERC20: approve from the zero address\"" } ], "id": 10670, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10233:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10678, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10233:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10679, "nodeType": "ExpressionStatement", "src": "10233:68:49" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 10686, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10681, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10319:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 10684, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10338:1:49", "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": 10683, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10330:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 10682, "name": "address", "nodeType": "ElementaryTypeName", "src": "10330:7:49", "typeDescriptions": {} } }, "id": 10685, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10330:10:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10319:21:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f766520746f20746865207a65726f2061646472657373", "id": 10687, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10342:36:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" }, "value": "ERC20: approve to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" } ], "id": 10680, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10311:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10688, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10311:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10689, "nodeType": "ExpressionStatement", "src": "10311:68:49" }, { "expression": { "id": 10696, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "baseExpression": { "id": 10690, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10207, "src": "10390:11:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 10693, "indexExpression": { "id": 10691, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10402:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "10390:18:49", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 10694, "indexExpression": { "id": 10692, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10409:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "10390:27:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 10695, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10667, "src": "10420:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10390:36:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 10697, "nodeType": "ExpressionStatement", "src": "10390:36:49" }, { "eventCall": { "arguments": [ { "id": 10699, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10663, "src": "10450:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10700, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10665, "src": "10457:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10701, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10667, "src": "10466:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10698, "name": "Approval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10792, "src": "10441:8:49", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10702, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10441:32:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10703, "nodeType": "EmitStatement", "src": "10436:37:49" } ] }, "documentation": { "id": 10661, "nodeType": "StructuredDocumentation", "src": "9693:412:49", "text": " @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n This internal function is equivalent to `approve`, and can be used to\n e.g. set automatic allowances for certain subsystems, etc.\n Emits an {Approval} event.\n Requirements:\n - `owner` cannot be the zero address.\n - `spender` cannot be the zero address." }, "id": 10705, "implemented": true, "kind": "function", "modifiers": [], "name": "_approve", "nameLocation": "10119:8:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10668, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10663, "mutability": "mutable", "name": "owner", "nameLocation": "10145:5:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10137:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10662, "name": "address", "nodeType": "ElementaryTypeName", "src": "10137:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10665, "mutability": "mutable", "name": "spender", "nameLocation": "10168:7:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10160:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10664, "name": "address", "nodeType": "ElementaryTypeName", "src": "10160:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10667, "mutability": "mutable", "name": "amount", "nameLocation": "10193:6:49", "nodeType": "VariableDeclaration", "scope": 10705, "src": "10185:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10666, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10185:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10127:78:49" }, "returnParameters": { "id": 10669, "nodeType": "ParameterList", "parameters": [], "src": "10223:0:49" }, "scope": 10771, "src": "10110:370:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10747, "nodeType": "Block", "src": "10881:321:49", "statements": [ { "assignments": [ 10716 ], "declarations": [ { "constant": false, "id": 10716, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "10899:16:49", "nodeType": "VariableDeclaration", "scope": 10747, "src": "10891:24:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10715, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10891:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 10721, "initialValue": { "arguments": [ { "id": 10718, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10708, "src": "10928:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10719, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10710, "src": "10935:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 10717, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10327, "src": "10918:9:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 10720, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10918:25:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "10891:52:49" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10728, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10722, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "10957:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "expression": { "arguments": [ { "id": 10725, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10982:7:49", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": { "id": 10724, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10982:7:49", "typeDescriptions": {} } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" } ], "id": 10723, "name": "type", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967269, "src": "10977:4:49", "typeDescriptions": { "typeIdentifier": "t_function_metatype_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 10726, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "10977:13:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_magic_meta_type_t_uint256", "typeString": "type(uint256)" } }, "id": 10727, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberName": "max", "nodeType": "MemberAccess", "src": "10977:17:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10957:37:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 10746, "nodeType": "IfStatement", "src": "10953:243:49", "trueBody": { "id": 10745, "nodeType": "Block", "src": "10996:200:49", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10732, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10730, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "11018:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 10731, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10712, "src": "11038:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11018:26:49", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20696e73756666696369656e7420616c6c6f77616e6365", "id": 10733, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11046:31:49", "typeDescriptions": { "typeIdentifier": "t_stringliteral_3b6607e091cba9325f958656d2b5e0622ab7dc0eac71a26ac788cb25bc19f4fe", "typeString": "literal_string \"ERC20: insufficient allowance\"" }, "value": "ERC20: insufficient allowance" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_3b6607e091cba9325f958656d2b5e0622ab7dc0eac71a26ac788cb25bc19f4fe", "typeString": "literal_string \"ERC20: insufficient allowance\"" } ], "id": 10729, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "11010:7:49", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 10734, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11010:68:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10735, "nodeType": "ExpressionStatement", "src": "11010:68:49" }, { "id": 10744, "nodeType": "UncheckedBlock", "src": "11092:94:49", "statements": [ { "expression": { "arguments": [ { "id": 10737, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10708, "src": "11129:5:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 10738, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10710, "src": "11136:7:49", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 10741, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 10739, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10716, "src": "11145:16:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 10740, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10712, "src": "11164:6:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11145:25:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 10736, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 10705, "src": "11120:8:49", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 10742, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "11120:51:49", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 10743, "nodeType": "ExpressionStatement", "src": "11120:51:49" } ] } ] } } ] }, "documentation": { "id": 10706, "nodeType": "StructuredDocumentation", "src": "10486:270:49", "text": " @dev Updates `owner` s allowance for `spender` based on spent `amount`.\n Does not update the allowance amount in case of infinite allowance.\n Revert if not enough allowance is available.\n Might emit an {Approval} event." }, "id": 10748, "implemented": true, "kind": "function", "modifiers": [], "name": "_spendAllowance", "nameLocation": "10770:15:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10713, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10708, "mutability": "mutable", "name": "owner", "nameLocation": "10803:5:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10795:13:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10707, "name": "address", "nodeType": "ElementaryTypeName", "src": "10795:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10710, "mutability": "mutable", "name": "spender", "nameLocation": "10826:7:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10818:15:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10709, "name": "address", "nodeType": "ElementaryTypeName", "src": "10818:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10712, "mutability": "mutable", "name": "amount", "nameLocation": "10851:6:49", "nodeType": "VariableDeclaration", "scope": 10748, "src": "10843:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10711, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10843:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10785:78:49" }, "returnParameters": { "id": 10714, "nodeType": "ParameterList", "parameters": [], "src": "10881:0:49" }, "scope": 10771, "src": "10761:441:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10758, "nodeType": "Block", "src": "11905:2:49", "statements": [] }, "documentation": { "id": 10749, "nodeType": "StructuredDocumentation", "src": "11208:573:49", "text": " @dev Hook that is called before any transfer of tokens. This includes\n minting and burning.\n Calling conditions:\n - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n will be transferred to `to`.\n - when `from` is zero, `amount` tokens will be minted for `to`.\n - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n - `from` and `to` are never both zero.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 10759, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nameLocation": "11795:20:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10756, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10751, "mutability": "mutable", "name": "from", "nameLocation": "11833:4:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11825:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10750, "name": "address", "nodeType": "ElementaryTypeName", "src": "11825:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10753, "mutability": "mutable", "name": "to", "nameLocation": "11855:2:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11847:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10752, "name": "address", "nodeType": "ElementaryTypeName", "src": "11847:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10755, "mutability": "mutable", "name": "amount", "nameLocation": "11875:6:49", "nodeType": "VariableDeclaration", "scope": 10759, "src": "11867:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10754, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11867:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "11815:72:49" }, "returnParameters": { "id": 10757, "nodeType": "ParameterList", "parameters": [], "src": "11905:0:49" }, "scope": 10771, "src": "11786:121:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 10769, "nodeType": "Block", "src": "12613:2:49", "statements": [] }, "documentation": { "id": 10760, "nodeType": "StructuredDocumentation", "src": "11913:577:49", "text": " @dev Hook that is called after any transfer of tokens. This includes\n minting and burning.\n Calling conditions:\n - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n has been transferred to `to`.\n - when `from` is zero, `amount` tokens have been minted for `to`.\n - when `to` is zero, `amount` of ``from``'s tokens have been burned.\n - `from` and `to` are never both zero.\n To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]." }, "id": 10770, "implemented": true, "kind": "function", "modifiers": [], "name": "_afterTokenTransfer", "nameLocation": "12504:19:49", "nodeType": "FunctionDefinition", "parameters": { "id": 10767, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 10762, "mutability": "mutable", "name": "from", "nameLocation": "12541:4:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12533:12:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10761, "name": "address", "nodeType": "ElementaryTypeName", "src": "12533:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10764, "mutability": "mutable", "name": "to", "nameLocation": "12563:2:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12555:10:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 10763, "name": "address", "nodeType": "ElementaryTypeName", "src": "12555:7:49", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 10766, "mutability": "mutable", "name": "amount", "nameLocation": "12583:6:49", "nodeType": "VariableDeclaration", "scope": 10770, "src": "12575:14:49", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 10765, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12575:7:49", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "12523:72:49" }, "returnParameters": { "id": 10768, "nodeType": "ParameterList", "parameters": [], "src": "12613:0:49" }, "scope": 10771, "src": "12495:120:49", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" } ], "scope": 10772, "src": "1403:11214:49", "usedErrors": [] } ], "src": "105:12513:49" }, "compiler": { "name": "solc", "version": "0.8.7+commit.e28d00a7.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.1.0", "updatedAt": "2023-03-16T16:54:15.265Z", "devdoc": { "details": "Implementation of the {IERC20} interface. This implementation is agnostic to the way tokens are created. This means that a supply mechanism has to be added in a derived contract using {_mint}. For a generic mechanism see {ERC20PresetMinterPauser}. TIP: For a detailed writeup see our guide https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How to implement supply mechanisms]. We have followed general OpenZeppelin Contracts guidelines: functions revert instead returning `false` on failure. This behavior is nonetheless conventional and does not conflict with the expectations of ERC20 applications. Additionally, an {Approval} event is emitted on calls to {transferFrom}. This allows applications to reconstruct the allowance for all accounts just by listening to said events. Other implementations of the EIP may not emit these events, as it isn't required by the specification. Finally, the non-standard {decreaseAllowance} and {increaseAllowance} functions have been added to mitigate the well-known issues around setting allowances. See {IERC20-approve}.", "kind": "dev", "methods": { "allowance(address,address)": { "details": "See {IERC20-allowance}." }, "approve(address,uint256)": { "details": "See {IERC20-approve}. NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on `transferFrom`. This is semantically equivalent to an infinite approval. Requirements: - `spender` cannot be the zero address." }, "balanceOf(address)": { "details": "See {IERC20-balanceOf}." }, "constructor": { "details": "Sets the values for {name} and {symbol}. The default value of {decimals} is 18. To select a different value for {decimals} you should overload it. All two of these values are immutable: they can only be set once during construction." }, "decimals()": { "details": "Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5.05` (`505 / 10 ** 2`). Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless this function is overridden; NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}." }, "decreaseAllowance(address,uint256)": { "details": "Atomically decreases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`." }, "increaseAllowance(address,uint256)": { "details": "Atomically increases the allowance granted to `spender` by the caller. This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. Emits an {Approval} event indicating the updated allowance. Requirements: - `spender` cannot be the zero address." }, "name()": { "details": "Returns the name of the token." }, "symbol()": { "details": "Returns the symbol of the token, usually a shorter version of the name." }, "totalSupply()": { "details": "See {IERC20-totalSupply}." }, "transfer(address,uint256)": { "details": "See {IERC20-transfer}. Requirements: - `to` cannot be the zero address. - the caller must have a balance of at least `amount`." }, "transferFrom(address,address,uint256)": { "details": "See {IERC20-transferFrom}. Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}. NOTE: Does not update the allowance if the current allowance is the maximum `uint256`. Requirements: - `from` and `to` cannot be the zero address. - `from` must have a balance of at least `amount`. - the caller must have allowance for ``from``'s tokens of at least `amount`." } }, "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }