{ "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\":\"0.8.17+commit.8df45f5f\"},\"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\":10},\"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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abi_decode_string_fromMemory(offset, end) -> array\n {\n if iszero(slt(add(offset, 0x1f), end)) { revert(0, 0) }\n let _1 := mload(offset)\n let _2 := sub(shl(64, 1), 1)\n if gt(_1, _2) { panic_error_0x41() }\n let _3 := not(31)\n let memPtr := mload(64)\n let newFreePtr := add(memPtr, and(add(and(add(_1, 0x1f), _3), 63), _3))\n if or(gt(newFreePtr, _2), lt(newFreePtr, memPtr)) { panic_error_0x41() }\n mstore(64, newFreePtr)\n mstore(memPtr, _1)\n let _4 := 0x20\n if gt(add(add(offset, _1), _4), end) { revert(0, 0) }\n let i := 0\n for { } lt(i, _1) { i := add(i, _4) }\n {\n mstore(add(add(memPtr, i), _4), mload(add(add(offset, i), _4)))\n }\n mstore(add(add(memPtr, _1), _4), 0)\n array := memPtr\n }\n function abi_decode_tuple_t_string_memory_ptrt_string_memory_ptr_fromMemory(headStart, dataEnd) -> value0, value1\n {\n if slt(sub(dataEnd, headStart), 64) { revert(0, 0) }\n let offset := mload(headStart)\n let _1 := sub(shl(64, 1), 1)\n if gt(offset, _1) { revert(0, 0) }\n value0 := abi_decode_string_fromMemory(add(headStart, offset), dataEnd)\n let offset_1 := mload(add(headStart, 32))\n if gt(offset_1, _1) { revert(0, 0) }\n value1 := abi_decode_string_fromMemory(add(headStart, offset_1), dataEnd)\n }\n function extract_byte_array_length(data) -> length\n {\n length := shr(1, data)\n let outOfPlaceEncoding := and(data, 1)\n if iszero(outOfPlaceEncoding) { length := and(length, 0x7f) }\n if eq(outOfPlaceEncoding, lt(length, 32))\n {\n mstore(0, shl(224, 0x4e487b71))\n mstore(4, 0x22)\n revert(0, 0x24)\n }\n }\n function array_dataslot_string_storage(ptr) -> data\n {\n mstore(0, ptr)\n data := keccak256(0, 0x20)\n }\n function clean_up_bytearray_end_slots_string_storage(array, len, startIndex)\n {\n if gt(len, 31)\n {\n let _1 := 0\n mstore(_1, array)\n let data := keccak256(_1, 0x20)\n let deleteStart := add(data, shr(5, add(startIndex, 31)))\n if lt(startIndex, 0x20) { deleteStart := data }\n let _2 := add(data, shr(5, add(len, 31)))\n let start := deleteStart\n for { } lt(start, _2) { start := add(start, 1) }\n { sstore(start, _1) }\n }\n }\n function extract_used_part_and_set_length_of_short_byte_array(data, len) -> used\n {\n used := or(and(data, not(shr(shl(3, len), not(0)))), shl(1, len))\n }\n function copy_byte_array_to_storage_from_t_string_memory_ptr_to_t_string_storage(slot, src)\n {\n let newLen := mload(src)\n if gt(newLen, sub(shl(64, 1), 1)) { panic_error_0x41() }\n clean_up_bytearray_end_slots_string_storage(slot, extract_byte_array_length(sload(slot)), newLen)\n let srcOffset := 0\n let srcOffset_1 := 0x20\n srcOffset := srcOffset_1\n switch gt(newLen, 31)\n case 1 {\n let loopEnd := and(newLen, not(31))\n let dstPtr := array_dataslot_string_storage(slot)\n let i := 0\n for { } lt(i, loopEnd) { i := add(i, srcOffset_1) }\n {\n sstore(dstPtr, mload(add(src, srcOffset)))\n dstPtr := add(dstPtr, 1)\n srcOffset := add(srcOffset, srcOffset_1)\n }\n if lt(loopEnd, newLen)\n {\n let lastValue := mload(add(src, srcOffset))\n sstore(dstPtr, and(lastValue, not(shr(and(shl(3, newLen), 248), not(0)))))\n }\n sstore(slot, add(shl(1, newLen), 1))\n }\n default {\n let value := 0\n if newLen\n {\n value := mload(add(src, srcOffset))\n }\n sstore(slot, extract_used_part_and_set_length_of_short_byte_array(value, newLen))\n }\n }\n}", "id": 54, "language": "Yul", "name": "#utility.yul" } ], "deployedGeneratedSources": [ { "ast": { "nodeType": "YulBlock", "src": "0:5754:54", "statements": [ { "nodeType": "YulBlock", "src": "6:3:54", "statements": [] }, { "body": { "nodeType": "YulBlock", "src": "135:427:54", "statements": [ { "nodeType": "YulVariableDeclaration", "src": "145:12:54", "value": { "kind": "number", "nodeType": "YulLiteral", "src": "155:2:54", "type": "", "value": "32" }, "variables": [ { "name": "_1", "nodeType": "YulTypedName", "src": "149:2:54", "type": "" } ] }, { "expression": { "arguments": [ { "name": "headStart", "nodeType": "YulIdentifier", "src": "173:9:54" }, { "name": "_1", "nodeType": 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"5350:402:54" } ] }, "contents": "{\n { }\n function abi_encode_tuple_t_string_memory_ptr__to_t_string_memory_ptr__fromStack_reversed(headStart, value0) -> tail\n {\n let _1 := 32\n mstore(headStart, _1)\n let length := mload(value0)\n mstore(add(headStart, _1), length)\n let i := 0\n for { } lt(i, length) { i := add(i, _1) }\n {\n mstore(add(add(headStart, i), 64), mload(add(add(value0, i), _1)))\n }\n mstore(add(add(headStart, length), 64), 0)\n tail := add(add(headStart, and(add(length, 31), not(31))), 64)\n }\n function abi_decode_address(offset) -> value\n {\n value := calldataload(offset)\n if iszero(eq(value, and(value, sub(shl(160, 1), 1)))) { revert(0, 0) }\n }\n function abi_decode_tuple_t_addresst_uint256(headStart, dataEnd) -> value0, value1\n {\n if slt(sub(dataEnd, headStart), 64) { revert(0, 0) }\n value0 := abi_decode_address(headStart)\n value1 := calldataload(add(headStart, 32))\n }\n function abi_encode_tuple_t_bool__to_t_bool__fromStack_reversed(headStart, value0) -> tail\n {\n tail := add(headStart, 32)\n mstore(headStart, iszero(iszero(value0)))\n }\n function abi_encode_tuple_t_uint256__to_t_uint256__fromStack_reversed(headStart, value0) -> tail\n {\n tail := add(headStart, 32)\n mstore(headStart, value0)\n }\n function abi_decode_tuple_t_addresst_addresst_uint256(headStart, dataEnd) -> value0, value1, value2\n {\n if slt(sub(dataEnd, headStart), 96) { revert(0, 0) }\n value0 := abi_decode_address(headStart)\n value1 := abi_decode_address(add(headStart, 32))\n value2 := calldataload(add(headStart, 64))\n }\n function abi_encode_tuple_t_uint8__to_t_uint8__fromStack_reversed(headStart, value0) -> tail\n {\n tail := add(headStart, 32)\n mstore(headStart, and(value0, 0xff))\n }\n function abi_decode_tuple_t_address(headStart, dataEnd) -> value0\n {\n if slt(sub(dataEnd, headStart), 32) { revert(0, 0) }\n value0 := abi_decode_address(headStart)\n }\n function abi_decode_tuple_t_addresst_address(headStart, dataEnd) -> value0, value1\n {\n if slt(sub(dataEnd, headStart), 64) { revert(0, 0) }\n value0 := abi_decode_address(headStart)\n value1 := abi_decode_address(add(headStart, 32))\n }\n function extract_byte_array_length(data) -> length\n {\n length := shr(1, data)\n let outOfPlaceEncoding := and(data, 1)\n if iszero(outOfPlaceEncoding) { length := and(length, 0x7f) }\n if eq(outOfPlaceEncoding, lt(length, 32))\n {\n mstore(0, shl(224, 0x4e487b71))\n mstore(4, 0x22)\n revert(0, 0x24)\n }\n }\n function checked_add_t_uint256(x, y) -> sum\n {\n sum := add(x, y)\n if gt(x, sum)\n {\n mstore(0, shl(224, 0x4e487b71))\n mstore(4, 0x11)\n revert(0, 0x24)\n }\n }\n function abi_encode_tuple_t_stringliteral_f8b476f7d28209d77d4a4ac1fe36b9f8259aa1bb6bddfa6e89de7e51615cf8a8__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 37)\n mstore(add(headStart, 64), \"ERC20: decreased allowance below\")\n mstore(add(headStart, 96), \" zero\")\n tail := add(headStart, 128)\n }\n function abi_encode_tuple_t_stringliteral_c953f4879035ed60e766b34720f656aab5c697b141d924c283124ecedb91c208__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 36)\n mstore(add(headStart, 64), \"ERC20: approve from the zero add\")\n mstore(add(headStart, 96), \"ress\")\n tail := add(headStart, 128)\n }\n function abi_encode_tuple_t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 34)\n mstore(add(headStart, 64), \"ERC20: approve to the zero addre\")\n mstore(add(headStart, 96), \"ss\")\n tail := add(headStart, 128)\n }\n function abi_encode_tuple_t_stringliteral_3b6607e091cba9325f958656d2b5e0622ab7dc0eac71a26ac788cb25bc19f4fe__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 29)\n mstore(add(headStart, 64), \"ERC20: insufficient allowance\")\n tail := add(headStart, 96)\n }\n function abi_encode_tuple_t_stringliteral_baecc556b46f4ed0f2b4cb599d60785ac8563dd2dc0a5bf12edea1c39e5e1fea__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 37)\n mstore(add(headStart, 64), \"ERC20: transfer from the zero ad\")\n mstore(add(headStart, 96), \"dress\")\n tail := add(headStart, 128)\n }\n function abi_encode_tuple_t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 35)\n mstore(add(headStart, 64), \"ERC20: transfer to the zero addr\")\n mstore(add(headStart, 96), \"ess\")\n tail := add(headStart, 128)\n }\n function abi_encode_tuple_t_stringliteral_4107e8a8b9e94bf8ff83080ddec1c0bffe897ebc2241b89d44f66b3d274088b6__to_t_string_memory_ptr__fromStack_reversed(headStart) -> tail\n {\n mstore(headStart, 32)\n mstore(add(headStart, 32), 38)\n mstore(add(headStart, 64), \"ERC20: transfer amount exceeds b\")\n mstore(add(headStart, 96), \"alance\")\n tail := add(headStart, 128)\n }\n}", "id": 54, "language": "Yul", "name": "#utility.yul" } ], "sourceMap": 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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": [ 3401 ], "ERC20": [ 3239 ], "IERC20": [ 3317 ], "IERC20Metadata": [ 3379 ] }, "id": 3240, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 2655, "literals": [ "solidity", "^", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "105:23:16" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/IERC20.sol", "file": "./IERC20.sol", "id": 2656, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 3240, "sourceUnit": 3318, "src": "130:22:16", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol", "file": "./extensions/IERC20Metadata.sol", "id": 2657, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 3240, "sourceUnit": 3380, "src": "153:41:16", "symbolAliases": [], "unitAlias": "" }, { "absolutePath": "@openzeppelin/contracts/utils/Context.sol", "file": "../../utils/Context.sol", "id": 2658, "nameLocation": "-1:-1:-1", "nodeType": "ImportDirective", "scope": 3240, "sourceUnit": 3402, "src": "195:33:16", "symbolAliases": [], "unitAlias": "" }, { "abstract": false, "baseContracts": [ { "baseName": { "id": 2660, "name": "Context", "nameLocations": [ "1421:7:16" ], "nodeType": "IdentifierPath", "referencedDeclaration": 3401, "src": "1421:7:16" }, "id": 2661, "nodeType": "InheritanceSpecifier", "src": "1421:7:16" }, { "baseName": { "id": 2662, "name": "IERC20", "nameLocations": [ "1430:6:16" ], "nodeType": "IdentifierPath", "referencedDeclaration": 3317, "src": "1430:6:16" }, "id": 2663, "nodeType": "InheritanceSpecifier", "src": "1430:6:16" }, { "baseName": { "id": 2664, "name": "IERC20Metadata", "nameLocations": [ "1438:14:16" ], "nodeType": "IdentifierPath", "referencedDeclaration": 3379, "src": "1438:14:16" }, "id": 2665, "nodeType": "InheritanceSpecifier", "src": "1438:14:16" } ], "canonicalName": "ERC20", "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 2659, "nodeType": "StructuredDocumentation", "src": "230:1172:16", "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": 3239, "linearizedBaseContracts": [ 3239, 3379, 3317, 3401 ], "name": "ERC20", "nameLocation": "1412:5:16", "nodeType": "ContractDefinition", "nodes": [ { "constant": false, "id": 2669, "mutability": "mutable", "name": "_balances", "nameLocation": "1495:9:16", "nodeType": "VariableDeclaration", "scope": 3239, "src": "1459:45:16", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "typeName": { "id": 2668, "keyType": { "id": 2666, "name": "address", "nodeType": "ElementaryTypeName", "src": "1467:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1459:27:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 2667, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1478:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } }, "visibility": "private" }, { "constant": false, "id": 2675, "mutability": "mutable", "name": "_allowances", "nameLocation": "1567:11:16", "nodeType": "VariableDeclaration", "scope": 3239, "src": "1511:67:16", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "typeName": { "id": 2674, "keyType": { "id": 2670, "name": "address", "nodeType": "ElementaryTypeName", "src": "1519:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1511:47:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" }, "valueType": { "id": 2673, "keyType": { "id": 2671, "name": "address", "nodeType": "ElementaryTypeName", "src": "1538:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "Mapping", "src": "1530:27:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" }, "valueType": { "id": 2672, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1549:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } } }, "visibility": "private" }, { "constant": false, "id": 2677, "mutability": "mutable", "name": "_totalSupply", "nameLocation": "1601:12:16", "nodeType": "VariableDeclaration", "scope": 3239, "src": "1585:28:16", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2676, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "1585:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "private" }, { "constant": false, "id": 2679, "mutability": "mutable", "name": "_name", "nameLocation": "1635:5:16", "nodeType": "VariableDeclaration", "scope": 3239, "src": "1620:20:16", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 2678, "name": "string", "nodeType": "ElementaryTypeName", "src": "1620:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "constant": false, "id": 2681, "mutability": "mutable", "name": "_symbol", "nameLocation": "1661:7:16", "nodeType": "VariableDeclaration", "scope": 3239, "src": "1646:22:16", "stateVariable": true, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string" }, "typeName": { "id": 2680, "name": "string", "nodeType": "ElementaryTypeName", "src": "1646:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "private" }, { "body": { "id": 2697, "nodeType": "Block", "src": "2034:57:16", "statements": [ { "expression": { "id": 2691, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 2689, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2679, "src": "2044:5:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 2690, "name": "name_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2684, "src": "2052:5:16", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2044:13:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 2692, "nodeType": "ExpressionStatement", "src": "2044:13:16" }, { "expression": { "id": 2695, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 2693, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2681, "src": "2067:7:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 2694, "name": "symbol_", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2686, "src": "2077:7:16", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string memory" } }, "src": "2067:17:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "id": 2696, "nodeType": "ExpressionStatement", "src": "2067:17:16" } ] }, "documentation": { "id": 2682, "nodeType": "StructuredDocumentation", "src": "1675:298:16", "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": 2698, "implemented": true, "kind": "constructor", "modifiers": [], "name": "", "nameLocation": "-1:-1:-1", "nodeType": "FunctionDefinition", "parameters": { "id": 2687, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2684, "mutability": "mutable", "name": "name_", "nameLocation": "2004:5:16", "nodeType": "VariableDeclaration", "scope": 2698, "src": "1990:19:16", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 2683, "name": "string", "nodeType": "ElementaryTypeName", "src": "1990:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" }, { "constant": false, "id": 2686, "mutability": "mutable", "name": "symbol_", "nameLocation": "2025:7:16", "nodeType": "VariableDeclaration", "scope": 2698, "src": "2011:21:16", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 2685, "name": "string", "nodeType": "ElementaryTypeName", "src": "2011:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "1989:44:16" }, "returnParameters": { "id": 2688, "nodeType": "ParameterList", "parameters": [], "src": "2034:0:16" }, "scope": 3239, "src": "1978:113:16", "stateMutability": "nonpayable", "virtual": false, "visibility": "public" }, { "baseFunctions": [ 3366 ], "body": { "id": 2707, "nodeType": "Block", "src": "2225:29:16", "statements": [ { "expression": { "id": 2705, "name": "_name", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2679, "src": "2242:5:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 2704, "id": 2706, "nodeType": "Return", "src": "2235:12:16" } ] }, "documentation": { "id": 2699, "nodeType": "StructuredDocumentation", "src": "2097:54:16", "text": " @dev Returns the name of the token." }, "functionSelector": "06fdde03", "id": 2708, "implemented": true, "kind": "function", "modifiers": [], "name": "name", "nameLocation": "2165:4:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2701, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2192:8:16" }, "parameters": { "id": 2700, "nodeType": "ParameterList", "parameters": [], "src": "2169:2:16" }, "returnParameters": { "id": 2704, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2703, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2708, "src": "2210:13:16", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 2702, "name": "string", "nodeType": "ElementaryTypeName", "src": "2210:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2209:15:16" }, "scope": 3239, "src": "2156:98:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3372 ], "body": { "id": 2717, "nodeType": "Block", "src": "2438:31:16", "statements": [ { "expression": { "id": 2715, "name": "_symbol", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2681, "src": "2455:7:16", "typeDescriptions": { "typeIdentifier": "t_string_storage", "typeString": "string storage ref" } }, "functionReturnParameters": 2714, "id": 2716, "nodeType": "Return", "src": "2448:14:16" } ] }, "documentation": { "id": 2709, "nodeType": "StructuredDocumentation", "src": "2260:102:16", "text": " @dev Returns the symbol of the token, usually a shorter version of the\n name." }, "functionSelector": "95d89b41", "id": 2718, "implemented": true, "kind": "function", "modifiers": [], "name": "symbol", "nameLocation": "2376:6:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2711, "nodeType": "OverrideSpecifier", "overrides": [], "src": "2405:8:16" }, "parameters": { "id": 2710, "nodeType": "ParameterList", "parameters": [], "src": "2382:2:16" }, "returnParameters": { "id": 2714, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2713, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2718, "src": "2423:13:16", "stateVariable": false, "storageLocation": "memory", "typeDescriptions": { "typeIdentifier": "t_string_memory_ptr", "typeString": "string" }, "typeName": { "id": 2712, "name": "string", "nodeType": "ElementaryTypeName", "src": "2423:6:16", "typeDescriptions": { "typeIdentifier": "t_string_storage_ptr", "typeString": "string" } }, "visibility": "internal" } ], "src": "2422:15:16" }, "scope": 3239, "src": "2367:102:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3378 ], "body": { "id": 2727, "nodeType": "Block", "src": "3158:26:16", "statements": [ { "expression": { "hexValue": "3138", "id": 2725, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "3175:2:16", "typeDescriptions": { "typeIdentifier": "t_rational_18_by_1", "typeString": "int_const 18" }, "value": "18" }, "functionReturnParameters": 2724, "id": 2726, "nodeType": "Return", "src": "3168:9:16" } ] }, "documentation": { "id": 2719, "nodeType": "StructuredDocumentation", "src": "2475:613:16", "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": 2728, "implemented": true, "kind": "function", "modifiers": [], "name": "decimals", "nameLocation": "3102:8:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2721, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3133:8:16" }, "parameters": { "id": 2720, "nodeType": "ParameterList", "parameters": [], "src": "3110:2:16" }, "returnParameters": { "id": 2724, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2723, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2728, "src": "3151:5:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" }, "typeName": { "id": 2722, "name": "uint8", "nodeType": "ElementaryTypeName", "src": "3151:5:16", "typeDescriptions": { "typeIdentifier": "t_uint8", "typeString": "uint8" } }, "visibility": "internal" } ], "src": "3150:7:16" }, "scope": 3239, "src": "3093:91:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3266 ], "body": { "id": 2737, "nodeType": "Block", "src": "3314:36:16", "statements": [ { "expression": { "id": 2735, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2677, "src": "3331:12:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 2734, "id": 2736, "nodeType": "Return", "src": "3324:19:16" } ] }, "documentation": { "id": 2729, "nodeType": "StructuredDocumentation", "src": "3190:49:16", "text": " @dev See {IERC20-totalSupply}." }, "functionSelector": "18160ddd", "id": 2738, "implemented": true, "kind": "function", "modifiers": [], "name": "totalSupply", "nameLocation": "3253:11:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2731, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3287:8:16" }, "parameters": { "id": 2730, "nodeType": "ParameterList", "parameters": [], "src": "3264:2:16" }, "returnParameters": { "id": 2734, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2733, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2738, "src": "3305:7:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2732, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3305:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3304:9:16" }, "scope": 3239, "src": "3244:106:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3274 ], "body": { "id": 2751, "nodeType": "Block", "src": "3491:42:16", "statements": [ { "expression": { "baseExpression": { "id": 2747, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "3508:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2749, "indexExpression": { "id": 2748, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2741, "src": "3518:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "3508:18:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 2746, "id": 2750, "nodeType": "Return", "src": "3501:25:16" } ] }, "documentation": { "id": 2739, "nodeType": "StructuredDocumentation", "src": "3356:47:16", "text": " @dev See {IERC20-balanceOf}." }, "functionSelector": "70a08231", "id": 2752, "implemented": true, "kind": "function", "modifiers": [], "name": "balanceOf", "nameLocation": "3417:9:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2743, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3464:8:16" }, "parameters": { "id": 2742, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2741, "mutability": "mutable", "name": "account", "nameLocation": "3435:7:16", "nodeType": "VariableDeclaration", "scope": 2752, "src": "3427:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2740, "name": "address", "nodeType": "ElementaryTypeName", "src": "3427:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3426:17:16" }, "returnParameters": { "id": 2746, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2745, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2752, "src": "3482:7:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2744, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3482:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3481:9:16" }, "scope": 3239, "src": "3408:125:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3284 ], "body": { "id": 2776, "nodeType": "Block", "src": "3814:104:16", "statements": [ { "assignments": [ 2764 ], "declarations": [ { "constant": false, "id": 2764, "mutability": "mutable", "name": "owner", "nameLocation": "3832:5:16", "nodeType": "VariableDeclaration", "scope": 2776, "src": "3824:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2763, "name": "address", "nodeType": "ElementaryTypeName", "src": "3824:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 2767, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 2765, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3391, "src": "3840:10:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 2766, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "3840:12:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "3824:28:16" }, { "expression": { "arguments": [ { "id": 2769, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2764, "src": "3872:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2770, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2755, "src": "3879:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2771, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2757, "src": "3883:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2768, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3000, "src": "3862:9:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2772, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "3862:28:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2773, "nodeType": "ExpressionStatement", "src": "3862:28:16" }, { "expression": { "hexValue": "74727565", "id": 2774, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "3907:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 2762, "id": 2775, "nodeType": "Return", "src": "3900:11:16" } ] }, "documentation": { "id": 2753, "nodeType": "StructuredDocumentation", "src": "3539:185:16", "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": 2777, "implemented": true, "kind": "function", "modifiers": [], "name": "transfer", "nameLocation": "3738:8:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2759, "nodeType": "OverrideSpecifier", "overrides": [], "src": "3790:8:16" }, "parameters": { "id": 2758, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2755, "mutability": "mutable", "name": "to", "nameLocation": "3755:2:16", "nodeType": "VariableDeclaration", "scope": 2777, "src": "3747:10:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2754, "name": "address", "nodeType": "ElementaryTypeName", "src": "3747:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2757, "mutability": "mutable", "name": "amount", "nameLocation": "3767:6:16", "nodeType": "VariableDeclaration", "scope": 2777, "src": "3759:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2756, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "3759:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "3746:28:16" }, "returnParameters": { "id": 2762, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2761, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2777, "src": "3808:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2760, "name": "bool", "nodeType": "ElementaryTypeName", "src": "3808:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "3807:6:16" }, "scope": 3239, "src": "3729:189:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3294 ], "body": { "id": 2794, "nodeType": "Block", "src": "4074:51:16", "statements": [ { "expression": { "baseExpression": { "baseExpression": { "id": 2788, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2675, "src": "4091:11:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 2790, "indexExpression": { "id": 2789, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2780, "src": "4103:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:18:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2792, "indexExpression": { "id": 2791, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2782, "src": "4110:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "4091:27:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "functionReturnParameters": 2787, "id": 2793, "nodeType": "Return", "src": "4084:34:16" } ] }, "documentation": { "id": 2778, "nodeType": "StructuredDocumentation", "src": "3924:47:16", "text": " @dev See {IERC20-allowance}." }, "functionSelector": "dd62ed3e", "id": 2795, "implemented": true, "kind": "function", "modifiers": [], "name": "allowance", "nameLocation": "3985:9:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2784, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4047:8:16" }, "parameters": { "id": 2783, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2780, "mutability": "mutable", "name": "owner", "nameLocation": "4003:5:16", "nodeType": "VariableDeclaration", "scope": 2795, "src": "3995:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2779, "name": "address", "nodeType": "ElementaryTypeName", "src": "3995:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2782, "mutability": "mutable", "name": "spender", "nameLocation": "4018:7:16", "nodeType": "VariableDeclaration", "scope": 2795, "src": "4010:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2781, "name": "address", "nodeType": "ElementaryTypeName", "src": "4010:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "src": "3994:32:16" }, "returnParameters": { "id": 2787, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2786, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2795, "src": "4065:7:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2785, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4065:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4064:9:16" }, "scope": 3239, "src": "3976:149:16", "stateMutability": "view", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3304 ], "body": { "id": 2819, "nodeType": "Block", "src": "4522:108:16", "statements": [ { "assignments": [ 2807 ], "declarations": [ { "constant": false, "id": 2807, "mutability": "mutable", "name": "owner", "nameLocation": "4540:5:16", "nodeType": "VariableDeclaration", "scope": 2819, "src": "4532:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2806, "name": "address", "nodeType": "ElementaryTypeName", "src": "4532:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 2810, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 2808, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3391, "src": "4548:10:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 2809, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "4548:12:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "4532:28:16" }, { "expression": { "arguments": [ { "id": 2812, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2807, "src": "4579:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2813, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2798, "src": "4586:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2814, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2800, "src": "4595:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2811, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3173, "src": "4570:8:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2815, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "4570:32:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2816, "nodeType": "ExpressionStatement", "src": "4570:32:16" }, { "expression": { "hexValue": "74727565", "id": 2817, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "4619:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 2805, "id": 2818, "nodeType": "Return", "src": "4612:11:16" } ] }, "documentation": { "id": 2796, "nodeType": "StructuredDocumentation", "src": "4131:297:16", "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": 2820, "implemented": true, "kind": "function", "modifiers": [], "name": "approve", "nameLocation": "4442:7:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2802, "nodeType": "OverrideSpecifier", "overrides": [], "src": "4498:8:16" }, "parameters": { "id": 2801, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2798, "mutability": "mutable", "name": "spender", "nameLocation": "4458:7:16", "nodeType": "VariableDeclaration", "scope": 2820, "src": "4450:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2797, "name": "address", "nodeType": "ElementaryTypeName", "src": "4450:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2800, "mutability": "mutable", "name": "amount", "nameLocation": "4475:6:16", "nodeType": "VariableDeclaration", "scope": 2820, "src": "4467:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2799, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "4467:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "4449:33:16" }, "returnParameters": { "id": 2805, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2804, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2820, "src": "4516:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2803, "name": "bool", "nodeType": "ElementaryTypeName", "src": "4516:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "4515:6:16" }, "scope": 3239, "src": "4433:197:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "baseFunctions": [ 3316 ], "body": { "id": 2852, "nodeType": "Block", "src": "5325:153:16", "statements": [ { "assignments": [ 2834 ], "declarations": [ { "constant": false, "id": 2834, "mutability": "mutable", "name": "spender", "nameLocation": "5343:7:16", "nodeType": "VariableDeclaration", "scope": 2852, "src": "5335:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2833, "name": "address", "nodeType": "ElementaryTypeName", "src": "5335:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 2837, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 2835, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3391, "src": "5353:10:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 2836, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "5353:12:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5335:30:16" }, { "expression": { "arguments": [ { "id": 2839, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2823, "src": "5391:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2840, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2834, "src": "5397:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2841, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2827, "src": "5406:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2838, "name": "_spendAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3216, "src": "5375:15:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2842, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "5375:38:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2843, "nodeType": "ExpressionStatement", "src": "5375:38:16" }, { "expression": { "arguments": [ { "id": 2845, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2823, "src": "5433:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2846, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2825, "src": "5439:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2847, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2827, "src": "5443:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2844, "name": "_transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3000, "src": "5423:9:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2848, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "5423:27:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2849, "nodeType": "ExpressionStatement", "src": "5423:27:16" }, { "expression": { "hexValue": "74727565", "id": 2850, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "5467:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 2832, "id": 2851, "nodeType": "Return", "src": "5460:11:16" } ] }, "documentation": { "id": 2821, "nodeType": "StructuredDocumentation", "src": "4636:551:16", "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": 2853, "implemented": true, "kind": "function", "modifiers": [], "name": "transferFrom", "nameLocation": "5201:12:16", "nodeType": "FunctionDefinition", "overrides": { "id": 2829, "nodeType": "OverrideSpecifier", "overrides": [], "src": "5301:8:16" }, "parameters": { "id": 2828, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2823, "mutability": "mutable", "name": "from", "nameLocation": "5231:4:16", "nodeType": "VariableDeclaration", "scope": 2853, "src": "5223:12:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2822, "name": "address", "nodeType": "ElementaryTypeName", "src": "5223:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2825, "mutability": "mutable", "name": "to", "nameLocation": "5253:2:16", "nodeType": "VariableDeclaration", "scope": 2853, "src": "5245:10:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2824, "name": "address", "nodeType": "ElementaryTypeName", "src": "5245:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2827, "mutability": "mutable", "name": "amount", "nameLocation": "5273:6:16", "nodeType": "VariableDeclaration", "scope": 2853, "src": "5265:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2826, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5265:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5213:72:16" }, "returnParameters": { "id": 2832, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2831, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2853, "src": "5319:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2830, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5319:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5318:6:16" }, "scope": 3239, "src": "5192:286:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 2881, "nodeType": "Block", "src": "5967:140:16", "statements": [ { "assignments": [ 2864 ], "declarations": [ { "constant": false, "id": 2864, "mutability": "mutable", "name": "owner", "nameLocation": "5985:5:16", "nodeType": "VariableDeclaration", "scope": 2881, "src": "5977:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2863, "name": "address", "nodeType": "ElementaryTypeName", "src": "5977:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 2867, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 2865, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3391, "src": "5993:10:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 2866, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "5993:12:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "5977:28:16" }, { "expression": { "arguments": [ { "id": 2869, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2864, "src": "6024:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2870, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2856, "src": "6031:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2876, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "arguments": [ { "id": 2872, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2864, "src": "6050:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2873, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2856, "src": "6057:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 2871, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2795, "src": "6040:9:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 2874, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6040:25:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "+", "rightExpression": { "id": 2875, "name": "addedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2858, "src": "6068:10:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6040:38:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2868, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3173, "src": "6015:8:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2877, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6015:64:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2878, "nodeType": "ExpressionStatement", "src": "6015:64:16" }, { "expression": { "hexValue": "74727565", "id": 2879, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "6096:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 2862, "id": 2880, "nodeType": "Return", "src": "6089:11:16" } ] }, "documentation": { "id": 2854, "nodeType": "StructuredDocumentation", "src": "5484:384:16", "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": 2882, "implemented": true, "kind": "function", "modifiers": [], "name": "increaseAllowance", "nameLocation": "5882:17:16", "nodeType": "FunctionDefinition", "parameters": { "id": 2859, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2856, "mutability": "mutable", "name": "spender", "nameLocation": "5908:7:16", "nodeType": "VariableDeclaration", "scope": 2882, "src": "5900:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2855, "name": "address", "nodeType": "ElementaryTypeName", "src": "5900:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2858, "mutability": "mutable", "name": "addedValue", "nameLocation": "5925:10:16", "nodeType": "VariableDeclaration", "scope": 2882, "src": "5917:18:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2857, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "5917:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "5899:37:16" }, "returnParameters": { "id": 2862, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2861, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2882, "src": "5961:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2860, "name": "bool", "nodeType": "ElementaryTypeName", "src": "5961:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "5960:6:16" }, "scope": 3239, "src": "5873:234:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 2922, "nodeType": "Block", "src": "6693:328:16", "statements": [ { "assignments": [ 2893 ], "declarations": [ { "constant": false, "id": 2893, "mutability": "mutable", "name": "owner", "nameLocation": "6711:5:16", "nodeType": "VariableDeclaration", "scope": 2922, "src": "6703:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2892, "name": "address", "nodeType": "ElementaryTypeName", "src": "6703:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" } ], "id": 2896, "initialValue": { "arguments": [], "expression": { "argumentTypes": [], "id": 2894, "name": "_msgSender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3391, "src": "6719:10:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$__$returns$_t_address_$", "typeString": "function () view returns (address)" } }, "id": 2895, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6719:12:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "VariableDeclarationStatement", "src": "6703:28:16" }, { "assignments": [ 2898 ], "declarations": [ { "constant": false, "id": 2898, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "6749:16:16", "nodeType": "VariableDeclaration", "scope": 2922, "src": "6741:24:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2897, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6741:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 2903, "initialValue": { "arguments": [ { "id": 2900, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2893, "src": "6778:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2901, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2885, "src": "6785:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 2899, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2795, "src": "6768:9:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 2902, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6768:25:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "6741:52:16" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2907, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2905, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2898, "src": "6811:16:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 2906, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2887, "src": "6831:15:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6811:35:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a2064656372656173656420616c6c6f77616e63652062656c6f77207a65726f", "id": 2908, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "6848:39:16", "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": 2904, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "6803:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 2909, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6803:85:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2910, "nodeType": "ExpressionStatement", "src": "6803:85:16" }, { "id": 2919, "nodeType": "UncheckedBlock", "src": "6898:95:16", "statements": [ { "expression": { "arguments": [ { "id": 2912, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2893, "src": "6931:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2913, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2885, "src": "6938:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2916, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2914, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2898, "src": "6947:16:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 2915, "name": "subtractedValue", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2887, "src": "6966:15:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "6947:34:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2911, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3173, "src": "6922:8:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2917, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "6922:60:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2918, "nodeType": "ExpressionStatement", "src": "6922:60:16" } ] }, { "expression": { "hexValue": "74727565", "id": 2920, "isConstant": false, "isLValue": false, "isPure": true, "kind": "bool", "lValueRequested": false, "nodeType": "Literal", "src": "7010:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "value": "true" }, "functionReturnParameters": 2891, "id": 2921, "nodeType": "Return", "src": "7003:11:16" } ] }, "documentation": { "id": 2883, "nodeType": "StructuredDocumentation", "src": "6113:476:16", "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": 2923, "implemented": true, "kind": "function", "modifiers": [], "name": "decreaseAllowance", "nameLocation": "6603:17:16", "nodeType": "FunctionDefinition", "parameters": { "id": 2888, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2885, "mutability": "mutable", "name": "spender", "nameLocation": "6629:7:16", "nodeType": "VariableDeclaration", "scope": 2923, "src": "6621:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2884, "name": "address", "nodeType": "ElementaryTypeName", "src": "6621:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2887, "mutability": "mutable", "name": "subtractedValue", "nameLocation": "6646:15:16", "nodeType": "VariableDeclaration", "scope": 2923, "src": "6638:23:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2886, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "6638:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "6620:42:16" }, "returnParameters": { "id": 2891, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2890, "mutability": "mutable", "name": "", "nameLocation": "-1:-1:-1", "nodeType": "VariableDeclaration", "scope": 2923, "src": "6687:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 2889, "name": "bool", "nodeType": "ElementaryTypeName", "src": "6687:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "visibility": "internal" } ], "src": "6686:6:16" }, "scope": 3239, "src": "6594:427:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "public" }, { "body": { "id": 2999, "nodeType": "Block", "src": "7583:543:16", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 2939, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2934, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "7601:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 2937, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7617:1:16", "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": 2936, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7609:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 2935, "name": "address", "nodeType": "ElementaryTypeName", "src": "7609:7:16", "typeDescriptions": {} } }, "id": 2938, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7609:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7601:18:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e736665722066726f6d20746865207a65726f2061646472657373", "id": 2940, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7621:39:16", "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": 2933, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7593:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 2941, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7593:68:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2942, "nodeType": "ExpressionStatement", "src": "7593:68:16" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 2949, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2944, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2928, "src": "7679:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 2947, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "7693:1:16", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 2946, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "7685:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 2945, "name": "address", "nodeType": "ElementaryTypeName", "src": "7685:7:16", "typeDescriptions": {} } }, "id": 2948, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7685:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "7679:16:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220746f20746865207a65726f2061646472657373", "id": 2950, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7697:37:16", "typeDescriptions": { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" }, "value": "ERC20: transfer to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_0557e210f7a69a685100a7e4e3d0a7024c546085cee28910fd17d0b081d9516f", "typeString": "literal_string \"ERC20: transfer to the zero address\"" } ], "id": 2943, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7671:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 2951, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7671:64:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2952, "nodeType": "ExpressionStatement", "src": "7671:64:16" }, { "expression": { "arguments": [ { "id": 2954, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "7767:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2955, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2928, "src": "7773:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2956, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "7777:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2953, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3227, "src": "7746:20:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2957, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7746:38:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2958, "nodeType": "ExpressionStatement", "src": "7746:38:16" }, { "assignments": [ 2960 ], "declarations": [ { "constant": false, "id": 2960, "mutability": "mutable", "name": "fromBalance", "nameLocation": "7803:11:16", "nodeType": "VariableDeclaration", "scope": 2999, "src": "7795:19:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2959, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7795:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 2964, "initialValue": { "baseExpression": { "id": 2961, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "7817:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2963, "indexExpression": { "id": 2962, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "7827:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "7817:15:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "7795:37:16" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2968, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2966, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2960, "src": "7850:11:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 2967, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "7865:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7850:21:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a207472616e7366657220616d6f756e7420657863656564732062616c616e6365", "id": 2969, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "7873:40:16", "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": 2965, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "7842:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 2970, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "7842:72:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2971, "nodeType": "ExpressionStatement", "src": "7842:72:16" }, { "id": 2980, "nodeType": "UncheckedBlock", "src": "7924:73:16", "statements": [ { "expression": { "id": 2978, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 2972, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "7948:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2974, "indexExpression": { "id": 2973, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "7958:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "7948:15:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 2977, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 2975, "name": "fromBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2960, "src": "7966:11:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 2976, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "7980:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7966:20:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "7948:38:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2979, "nodeType": "ExpressionStatement", "src": "7948:38:16" } ] }, { "expression": { "id": 2985, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 2981, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "8006:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 2983, "indexExpression": { "id": 2982, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2928, "src": "8016:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8006:13:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 2984, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "8023:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8006:23:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 2986, "nodeType": "ExpressionStatement", "src": "8006:23:16" }, { "eventCall": { "arguments": [ { "id": 2988, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "8054:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2989, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2928, "src": "8060:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2990, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "8064:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2987, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3251, "src": "8045:8:16", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2991, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8045:26:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2992, "nodeType": "EmitStatement", "src": "8040:31:16" }, { "expression": { "arguments": [ { "id": 2994, "name": "from", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2926, "src": "8102:4:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2995, "name": "to", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2928, "src": "8108:2:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 2996, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2930, "src": "8112:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 2993, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3238, "src": "8082:19:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 2997, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8082:37:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 2998, "nodeType": "ExpressionStatement", "src": "8082:37:16" } ] }, "documentation": { "id": 2924, "nodeType": "StructuredDocumentation", "src": "7027:443:16", "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": 3000, "implemented": true, "kind": "function", "modifiers": [], "name": "_transfer", "nameLocation": "7484:9:16", "nodeType": "FunctionDefinition", "parameters": { "id": 2931, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 2926, "mutability": "mutable", "name": "from", "nameLocation": "7511:4:16", "nodeType": "VariableDeclaration", "scope": 3000, "src": "7503:12:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2925, "name": "address", "nodeType": "ElementaryTypeName", "src": "7503:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2928, "mutability": "mutable", "name": "to", "nameLocation": "7533:2:16", "nodeType": "VariableDeclaration", "scope": 3000, "src": "7525:10:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 2927, "name": "address", "nodeType": "ElementaryTypeName", "src": "7525:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 2930, "mutability": "mutable", "name": "amount", "nameLocation": "7553:6:16", "nodeType": "VariableDeclaration", "scope": 3000, "src": "7545:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 2929, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "7545:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "7493:72:16" }, "returnParameters": { "id": 2932, "nodeType": "ParameterList", "parameters": [], "src": "7583:0:16" }, "scope": 3239, "src": "7475:651:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3055, "nodeType": "Block", "src": "8467:324:16", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3014, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3009, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3003, "src": "8485:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 3012, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8504:1:16", "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": 3011, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8496:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3010, "name": "address", "nodeType": "ElementaryTypeName", "src": "8496:7:16", "typeDescriptions": {} } }, "id": 3013, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8496:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "8485:21:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206d696e7420746f20746865207a65726f2061646472657373", "id": 3015, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "8508:33:16", "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": 3008, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "8477:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3016, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8477:65:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3017, "nodeType": "ExpressionStatement", "src": "8477:65:16" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 3021, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8582:1:16", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 3020, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8574:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3019, "name": "address", "nodeType": "ElementaryTypeName", "src": "8574:7:16", "typeDescriptions": {} } }, "id": 3022, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8574:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3023, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3003, "src": "8586:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3024, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3005, "src": "8595:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3018, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3227, "src": "8553:20:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3025, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8553:49:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3026, "nodeType": "ExpressionStatement", "src": "8553:49:16" }, { "expression": { "id": 3029, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 3027, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2677, "src": "8613:12:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 3028, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3005, "src": "8629:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8613:22:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3030, "nodeType": "ExpressionStatement", "src": "8613:22:16" }, { "expression": { "id": 3035, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 3031, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "8645:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 3033, "indexExpression": { "id": 3032, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3003, "src": "8655:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "8645:18:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "+=", "rightHandSide": { "id": 3034, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3005, "src": "8667:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "8645:28:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3036, "nodeType": "ExpressionStatement", "src": "8645:28:16" }, { "eventCall": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 3040, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8705:1:16", "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": 3039, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8697:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3038, "name": "address", "nodeType": "ElementaryTypeName", "src": "8697:7:16", "typeDescriptions": {} } }, "id": 3041, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8697:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3042, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3003, "src": "8709:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3043, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3005, "src": "8718:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3037, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3251, "src": "8688:8:16", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3044, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8688:37:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3045, "nodeType": "EmitStatement", "src": "8683:42:16" }, { "expression": { "arguments": [ { "arguments": [ { "hexValue": "30", "id": 3049, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "8764:1:16", "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": 3048, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "8756:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3047, "name": "address", "nodeType": "ElementaryTypeName", "src": "8756:7:16", "typeDescriptions": {} } }, "id": 3050, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8756:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3051, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3003, "src": "8768:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3052, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3005, "src": "8777:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3046, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3238, "src": "8736:19:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3053, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "8736:48:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3054, "nodeType": "ExpressionStatement", "src": "8736:48:16" } ] }, "documentation": { "id": 3001, "nodeType": "StructuredDocumentation", "src": "8132:265:16", "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": 3056, "implemented": true, "kind": "function", "modifiers": [], "name": "_mint", "nameLocation": "8411:5:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3006, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3003, "mutability": "mutable", "name": "account", "nameLocation": "8425:7:16", "nodeType": "VariableDeclaration", "scope": 3056, "src": "8417:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3002, "name": "address", "nodeType": "ElementaryTypeName", "src": "8417:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3005, "mutability": "mutable", "name": "amount", "nameLocation": "8442:6:16", "nodeType": "VariableDeclaration", "scope": 3056, "src": "8434:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3004, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "8434:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "8416:33:16" }, "returnParameters": { "id": 3007, "nodeType": "ParameterList", "parameters": [], "src": "8467:0:16" }, "scope": 3239, "src": "8402:389:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3127, "nodeType": "Block", "src": "9176:511:16", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3070, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3065, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9194:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 3068, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9213:1:16", "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": 3067, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9205:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3066, "name": "address", "nodeType": "ElementaryTypeName", "src": "9205:7:16", "typeDescriptions": {} } }, "id": 3069, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9205:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "9194:21:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e2066726f6d20746865207a65726f2061646472657373", "id": 3071, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9217:35:16", "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": 3064, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9186:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3072, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9186:67:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3073, "nodeType": "ExpressionStatement", "src": "9186:67:16" }, { "expression": { "arguments": [ { "id": 3075, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9285:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 3078, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9302:1:16", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 3077, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9294:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3076, "name": "address", "nodeType": "ElementaryTypeName", "src": "9294:7:16", "typeDescriptions": {} } }, "id": 3079, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9294:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3080, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9306:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3074, "name": "_beforeTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3227, "src": "9264:20:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3081, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9264:49:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3082, "nodeType": "ExpressionStatement", "src": "9264:49:16" }, { "assignments": [ 3084 ], "declarations": [ { "constant": false, "id": 3084, "mutability": "mutable", "name": "accountBalance", "nameLocation": "9332:14:16", "nodeType": "VariableDeclaration", "scope": 3127, "src": "9324:22:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3083, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9324:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 3088, "initialValue": { "baseExpression": { "id": 3085, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "9349:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 3087, "indexExpression": { "id": 3086, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9359:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "9349:18:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "9324:43:16" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3092, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3090, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3084, "src": "9385:14:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 3091, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9403:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9385:24:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a206275726e20616d6f756e7420657863656564732062616c616e6365", "id": 3093, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "9411:36:16", "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": 3089, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "9377:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3094, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9377:71:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3095, "nodeType": "ExpressionStatement", "src": "9377:71:16" }, { "id": 3104, "nodeType": "UncheckedBlock", "src": "9458:79:16", "statements": [ { "expression": { "id": 3102, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "id": 3096, "name": "_balances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2669, "src": "9482:9:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 3098, "indexExpression": { "id": 3097, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9492:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "9482:18:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3101, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3099, "name": "accountBalance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3084, "src": "9503:14:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 3100, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9520:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9503:23:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9482:44:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3103, "nodeType": "ExpressionStatement", "src": "9482:44:16" } ] }, { "expression": { "id": 3107, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "id": 3105, "name": "_totalSupply", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2677, "src": "9546:12:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "-=", "rightHandSide": { "id": 3106, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9562:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "9546:22:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3108, "nodeType": "ExpressionStatement", "src": "9546:22:16" }, { "eventCall": { "arguments": [ { "id": 3110, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9593:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 3113, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9610:1:16", "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": 3112, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9602:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3111, "name": "address", "nodeType": "ElementaryTypeName", "src": "9602:7:16", "typeDescriptions": {} } }, "id": 3114, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9602:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3115, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9614:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3109, "name": "Transfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3251, "src": "9584:8:16", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3116, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9584:37:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3117, "nodeType": "EmitStatement", "src": "9579:42:16" }, { "expression": { "arguments": [ { "id": 3119, "name": "account", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3059, "src": "9652:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "arguments": [ { "hexValue": "30", "id": 3122, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "9669:1:16", "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": 3121, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "9661:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3120, "name": "address", "nodeType": "ElementaryTypeName", "src": "9661:7:16", "typeDescriptions": {} } }, "id": 3123, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9661:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3124, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3061, "src": "9673:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3118, "name": "_afterTokenTransfer", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3238, "src": "9632:19:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3125, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "9632:48:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3126, "nodeType": "ExpressionStatement", "src": "9632:48:16" } ] }, "documentation": { "id": 3057, "nodeType": "StructuredDocumentation", "src": "8797:309:16", "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": 3128, "implemented": true, "kind": "function", "modifiers": [], "name": "_burn", "nameLocation": "9120:5:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3062, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3059, "mutability": "mutable", "name": "account", "nameLocation": "9134:7:16", "nodeType": "VariableDeclaration", "scope": 3128, "src": "9126:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3058, "name": "address", "nodeType": "ElementaryTypeName", "src": "9126:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3061, "mutability": "mutable", "name": "amount", "nameLocation": "9151:6:16", "nodeType": "VariableDeclaration", "scope": 3128, "src": "9143:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3060, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "9143:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "9125:33:16" }, "returnParameters": { "id": 3063, "nodeType": "ParameterList", "parameters": [], "src": "9176:0:16" }, "scope": 3239, "src": "9111:576:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3172, "nodeType": "Block", "src": "10223:257:16", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3144, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3139, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3131, "src": "10241:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 3142, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10258:1:16", "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": 3141, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10250:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3140, "name": "address", "nodeType": "ElementaryTypeName", "src": "10250:7:16", "typeDescriptions": {} } }, "id": 3143, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10250:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10241:19:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f76652066726f6d20746865207a65726f2061646472657373", "id": 3145, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10262:38:16", "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": 3138, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10233:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3146, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10233:68:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3147, "nodeType": "ExpressionStatement", "src": "10233:68:16" }, { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_address", "typeString": "address" }, "id": 3154, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3149, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3133, "src": "10319:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "arguments": [ { "hexValue": "30", "id": 3152, "isConstant": false, "isLValue": false, "isPure": true, "kind": "number", "lValueRequested": false, "nodeType": "Literal", "src": "10338:1:16", "typeDescriptions": { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" } ], "id": 3151, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10330:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_address_$", "typeString": "type(address)" }, "typeName": { "id": 3150, "name": "address", "nodeType": "ElementaryTypeName", "src": "10330:7:16", "typeDescriptions": {} } }, "id": 3153, "isConstant": false, "isLValue": false, "isPure": true, "kind": "typeConversion", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10330:10:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "src": "10319:21:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20617070726f766520746f20746865207a65726f2061646472657373", "id": 3155, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "10342:36:16", "typeDescriptions": { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" }, "value": "ERC20: approve to the zero address" } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" }, { "typeIdentifier": "t_stringliteral_24883cc5fe64ace9d0df1893501ecb93c77180f0ff69cca79affb3c316dc8029", "typeString": "literal_string \"ERC20: approve to the zero address\"" } ], "id": 3148, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "10311:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3156, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10311:68:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3157, "nodeType": "ExpressionStatement", "src": "10311:68:16" }, { "expression": { "id": 3164, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftHandSide": { "baseExpression": { "baseExpression": { "id": 3158, "name": "_allowances", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2675, "src": "10390:11:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_mapping$_t_address_$_t_uint256_$_$", "typeString": "mapping(address => mapping(address => uint256))" } }, "id": 3161, "indexExpression": { "id": 3159, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3131, "src": "10402:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": false, "nodeType": "IndexAccess", "src": "10390:18:16", "typeDescriptions": { "typeIdentifier": "t_mapping$_t_address_$_t_uint256_$", "typeString": "mapping(address => uint256)" } }, "id": 3162, "indexExpression": { "id": 3160, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3133, "src": "10409:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "isConstant": false, "isLValue": true, "isPure": false, "lValueRequested": true, "nodeType": "IndexAccess", "src": "10390:27:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "Assignment", "operator": "=", "rightHandSide": { "id": 3163, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3135, "src": "10420:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10390:36:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "id": 3165, "nodeType": "ExpressionStatement", "src": "10390:36:16" }, { "eventCall": { "arguments": [ { "id": 3167, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3131, "src": "10450:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3168, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3133, "src": "10457:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3169, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3135, "src": "10466:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3166, "name": "Approval", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3260, "src": "10441:8:16", "typeDescriptions": { "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3170, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10441:32:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3171, "nodeType": "EmitStatement", "src": "10436:37:16" } ] }, "documentation": { "id": 3129, "nodeType": "StructuredDocumentation", "src": "9693:412:16", "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": 3173, "implemented": true, "kind": "function", "modifiers": [], "name": "_approve", "nameLocation": "10119:8:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3136, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3131, "mutability": "mutable", "name": "owner", "nameLocation": "10145:5:16", "nodeType": "VariableDeclaration", "scope": 3173, "src": "10137:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3130, "name": "address", "nodeType": "ElementaryTypeName", "src": "10137:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3133, "mutability": "mutable", "name": "spender", "nameLocation": "10168:7:16", "nodeType": "VariableDeclaration", "scope": 3173, "src": "10160:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3132, "name": "address", "nodeType": "ElementaryTypeName", "src": "10160:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3135, "mutability": "mutable", "name": "amount", "nameLocation": "10193:6:16", "nodeType": "VariableDeclaration", "scope": 3173, "src": "10185:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3134, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10185:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10127:78:16" }, "returnParameters": { "id": 3137, "nodeType": "ParameterList", "parameters": [], "src": "10223:0:16" }, "scope": 3239, "src": "10110:370:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3215, "nodeType": "Block", "src": "10881:321:16", "statements": [ { "assignments": [ 3184 ], "declarations": [ { "constant": false, "id": 3184, "mutability": "mutable", "name": "currentAllowance", "nameLocation": "10899:16:16", "nodeType": "VariableDeclaration", "scope": 3215, "src": "10891:24:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3183, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10891:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "id": 3189, "initialValue": { "arguments": [ { "id": 3186, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3176, "src": "10928:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3187, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3178, "src": "10935:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" } ], "id": 3185, "name": "allowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 2795, "src": "10918:9:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_view$_t_address_$_t_address_$returns$_t_uint256_$", "typeString": "function (address,address) view returns (uint256)" } }, "id": 3188, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10918:25:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "VariableDeclarationStatement", "src": "10891:52:16" }, { "condition": { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3196, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3190, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3184, "src": "10957:16:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "!=", "rightExpression": { "expression": { "arguments": [ { "id": 3193, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "nodeType": "ElementaryTypeNameExpression", "src": "10982:7:16", "typeDescriptions": { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" }, "typeName": { "id": 3192, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10982:7:16", "typeDescriptions": {} } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_type$_t_uint256_$", "typeString": "type(uint256)" } ], "id": 3191, "name": "type", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 4294967269, "src": "10977:4:16", "typeDescriptions": { "typeIdentifier": "t_function_metatype_pure$__$returns$__$", "typeString": "function () pure" } }, "id": 3194, "isConstant": false, "isLValue": false, "isPure": true, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "10977:13:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_magic_meta_type_t_uint256", "typeString": "type(uint256)" } }, "id": 3195, "isConstant": false, "isLValue": false, "isPure": true, "lValueRequested": false, "memberLocation": "10991:3:16", "memberName": "max", "nodeType": "MemberAccess", "src": "10977:17:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "10957:37:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "id": 3214, "nodeType": "IfStatement", "src": "10953:243:16", "trueBody": { "id": 3213, "nodeType": "Block", "src": "10996:200:16", "statements": [ { "expression": { "arguments": [ { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3200, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3198, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3184, "src": "11018:16:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": ">=", "rightExpression": { "id": 3199, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3180, "src": "11038:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11018:26:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, { "hexValue": "45524332303a20696e73756666696369656e7420616c6c6f77616e6365", "id": 3201, "isConstant": false, "isLValue": false, "isPure": true, "kind": "string", "lValueRequested": false, "nodeType": "Literal", "src": "11046:31:16", "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": 3197, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 4294967278, 4294967278 ], "referencedDeclaration": 4294967278, "src": "11010:7:16", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$", "typeString": "function (bool,string memory) pure" } }, "id": 3202, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "11010:68:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3203, "nodeType": "ExpressionStatement", "src": "11010:68:16" }, { "id": 3212, "nodeType": "UncheckedBlock", "src": "11092:94:16", "statements": [ { "expression": { "arguments": [ { "id": 3205, "name": "owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3176, "src": "11129:5:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "id": 3206, "name": "spender", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3178, "src": "11136:7:16", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "commonType": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "id": 3209, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "leftExpression": { "id": 3207, "name": "currentAllowance", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3184, "src": "11145:16:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "nodeType": "BinaryOperation", "operator": "-", "rightExpression": { "id": 3208, "name": "amount", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3180, "src": "11164:6:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "src": "11145:25:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "id": 3204, "name": "_approve", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 3173, "src": "11120:8:16", "typeDescriptions": { "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$", "typeString": "function (address,address,uint256)" } }, "id": 3210, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "nameLocations": [], "names": [], "nodeType": "FunctionCall", "src": "11120:51:16", "tryCall": false, "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 3211, "nodeType": "ExpressionStatement", "src": "11120:51:16" } ] } ] } } ] }, "documentation": { "id": 3174, "nodeType": "StructuredDocumentation", "src": "10486:270:16", "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": 3216, "implemented": true, "kind": "function", "modifiers": [], "name": "_spendAllowance", "nameLocation": "10770:15:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3181, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3176, "mutability": "mutable", "name": "owner", "nameLocation": "10803:5:16", "nodeType": "VariableDeclaration", "scope": 3216, "src": "10795:13:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3175, "name": "address", "nodeType": "ElementaryTypeName", "src": "10795:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3178, "mutability": "mutable", "name": "spender", "nameLocation": "10826:7:16", "nodeType": "VariableDeclaration", "scope": 3216, "src": "10818:15:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3177, "name": "address", "nodeType": "ElementaryTypeName", "src": "10818:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3180, "mutability": "mutable", "name": "amount", "nameLocation": "10851:6:16", "nodeType": "VariableDeclaration", "scope": 3216, "src": "10843:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3179, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "10843:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "10785:78:16" }, "returnParameters": { "id": 3182, "nodeType": "ParameterList", "parameters": [], "src": "10881:0:16" }, "scope": 3239, "src": "10761:441:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3226, "nodeType": "Block", "src": "11905:2:16", "statements": [] }, "documentation": { "id": 3217, "nodeType": "StructuredDocumentation", "src": "11208:573:16", "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": 3227, "implemented": true, "kind": "function", "modifiers": [], "name": "_beforeTokenTransfer", "nameLocation": "11795:20:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3224, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3219, "mutability": "mutable", "name": "from", "nameLocation": "11833:4:16", "nodeType": "VariableDeclaration", "scope": 3227, "src": "11825:12:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3218, "name": "address", "nodeType": "ElementaryTypeName", "src": "11825:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3221, "mutability": "mutable", "name": "to", "nameLocation": "11855:2:16", "nodeType": "VariableDeclaration", "scope": 3227, "src": "11847:10:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3220, "name": "address", "nodeType": "ElementaryTypeName", "src": "11847:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3223, "mutability": "mutable", "name": "amount", "nameLocation": "11875:6:16", "nodeType": "VariableDeclaration", "scope": 3227, "src": "11867:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3222, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "11867:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "11815:72:16" }, "returnParameters": { "id": 3225, "nodeType": "ParameterList", "parameters": [], "src": "11905:0:16" }, "scope": 3239, "src": "11786:121:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" }, { "body": { "id": 3237, "nodeType": "Block", "src": "12613:2:16", "statements": [] }, "documentation": { "id": 3228, "nodeType": "StructuredDocumentation", "src": "11913:577:16", "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": 3238, "implemented": true, "kind": "function", "modifiers": [], "name": "_afterTokenTransfer", "nameLocation": "12504:19:16", "nodeType": "FunctionDefinition", "parameters": { "id": 3235, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 3230, "mutability": "mutable", "name": "from", "nameLocation": "12541:4:16", "nodeType": "VariableDeclaration", "scope": 3238, "src": "12533:12:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3229, "name": "address", "nodeType": "ElementaryTypeName", "src": "12533:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3232, "mutability": "mutable", "name": "to", "nameLocation": "12563:2:16", "nodeType": "VariableDeclaration", "scope": 3238, "src": "12555:10:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" }, "typeName": { "id": 3231, "name": "address", "nodeType": "ElementaryTypeName", "src": "12555:7:16", "stateMutability": "nonpayable", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, "visibility": "internal" }, { "constant": false, "id": 3234, "mutability": "mutable", "name": "amount", "nameLocation": "12583:6:16", "nodeType": "VariableDeclaration", "scope": 3238, "src": "12575:14:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" }, "typeName": { "id": 3233, "name": "uint256", "nodeType": "ElementaryTypeName", "src": "12575:7:16", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } }, "visibility": "internal" } ], "src": "12523:72:16" }, "returnParameters": { "id": 3236, "nodeType": "ParameterList", "parameters": [], "src": "12613:0:16" }, "scope": 3239, "src": "12495:120:16", "stateMutability": "nonpayable", "virtual": true, "visibility": "internal" } ], "scope": 3240, "src": "1403:11214:16", "usedErrors": [] } ], "src": "105:12513:16" }, "compiler": { "name": "solc", "version": "0.8.17+commit.8df45f5f.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.4.8", "updatedAt": "2022-12-08T12:51:01.311Z", "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 } }