Contract Source Code (Vyper language format)

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# @version ^0.3.9
# @title EthXYToken

from vyper.interfaces import ERC20

implements: ERC20

event Transfer:
    _from: indexed(address)
    _to: indexed(address)
    _value: uint256

event Approval:
    _owner: indexed(address)
    _spender: indexed(address)
    _value: uint256

name: public(immutable(String[10]))
symbol: public(immutable(String[3]))
decimals: public(constant(uint256)) = 18
totalSupply: public(uint256)

balanceOf: public(HashMap[address, uint256])
allowance: public(HashMap[address, HashMap[address, uint256]])

minter: public(address)
burner: public(address)

@external
def __init__():
    name = "EthXYToken"
    symbol = "EXY"
    self.minter = msg.sender
    self.burner = msg.sender

@external
def set_minter(minter: address):
    assert msg.sender == self.minter
    self.minter = minter

@external
def set_burner(burner: address):
    assert msg.sender == self.burner
    self.burner = burner

@external
def approve(spender: address, amount: uint256) -> bool:
    self.allowance[msg.sender][spender] = amount
    log Approval(msg.sender, spender, amount)
    return True

@external
def increaseAllowance(spender: address, addedValue: uint256) -> bool:
    self.allowance[msg.sender][spender] += addedValue
    log Approval(msg.sender, spender, self.allowance[msg.sender][spender])
    return True

@external
def decreaseAllowance(spender: address, subtractedValue: uint256) -> bool:
    self.allowance[msg.sender][spender] -= subtractedValue
    log Approval(msg.sender, spender, self.allowance[msg.sender][spender])
    return True

@external
def transfer(_to: address, _value: uint256) -> bool:
    self.balanceOf[msg.sender] -= _value
    self.balanceOf[_to] += _value
    log Transfer(msg.sender, _to, _value)
    return True

@external
def transferFrom(_from: address, _to: address, _value: uint256) -> bool:
    self.allowance[_from][msg.sender] -= _value
    self.balanceOf[_from] -= _value
    self.balanceOf[_to] += _value
    log Transfer(_from, _to, _value)
    return True

@external
def mint(_to: address, _value: uint256):
    assert msg.sender == self.minter
    self.balanceOf[_to] += _value
    self.totalSupply += _value
    log Transfer(ZERO_ADDRESS, _to, _value)

@external
def burn(_value: uint256):
    assert msg.sender == self.burner
    self.balanceOf[msg.sender] -= _value
    self.totalSupply -= _value
    log Transfer(msg.sender, ZERO_ADDRESS, _value)

################################################################
#                           EIP-2612                           #
################################################################

nonces: public(HashMap[address, uint256])

_DOMAIN_TYPEHASH: constant(bytes32) = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
_PERMIT_TYPE_HASH: constant(bytes32) = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")


@external
def permit(owner: address, spender: address, amount: uint256, deadline: uint256, v: uint8, r: bytes32, s: bytes32):
    assert deadline >= block.timestamp
    nonce: uint256 = self.nonces[owner]
    self.nonces[owner] = nonce + 1

    domain_separator: bytes32 = keccak256(
        _abi_encode(_DOMAIN_TYPEHASH, name, "1.0", chain.id, self)
    )

    struct_hash: bytes32 = keccak256(_abi_encode(_PERMIT_TYPE_HASH, owner, spender, amount, nonce, deadline))
    hash: bytes32 = keccak256(
        concat(
            b"\x19\x01",
            domain_separator,
            struct_hash
        )
    )

    assert owner == ecrecover(hash, v, r, s)
    self.nonces[owner] += 1
    self.allowance[owner][spender] = amount
    log Approval(owner, spender, amount)

@internal
def _mint(_to: address, _value: uint256):
    self.balanceOf[_to] += _value
    self.totalSupply += _value
    log Transfer(ZERO_ADDRESS, _to, _value)

@internal
def _burn(_from: address, _value: uint256):
    assert self.balanceOf[_from] >= _value
    self.balanceOf[_from] -= _value
    self.totalSupply -= _value
    log Transfer(_from, ZERO_ADDRESS, _value)

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[{"name":"Transfer","inputs":[{"name":"_from","type":"address","indexed":true},{"name":"_to","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Approval","inputs":[{"name":"_owner","type":"address","indexed":true},{"name":"_spender","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_minter","inputs":[{"name":"minter","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_burner","inputs":[{"name":"burner","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"approve","inputs":[{"name":"spender","type":"address"},{"name":"amount","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"increaseAllowance","inputs":[{"name":"spender","type":"address"},{"name":"addedValue","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"decreaseAllowance","inputs":[{"name":"spender","type":"address"},{"name":"subtractedValue","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"transfer","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"transferFrom","inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"mint","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"burn","inputs":[{"name":"_value","type":"uint256"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"permit","inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"},{"name":"amount","type":"uint256"},{"name":"deadline","type":"uint256"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"name","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"symbol","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"totalSupply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"balanceOf","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"allowance","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"minter","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"burner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"nonces","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]}]

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