LP Token Methods

name: public(immutable(String[64]))

@external
def __init__(
    _name: String[64],
    _symbol: String[32],
    _coins: address[N_COINS],
    _math: address,
    _salt: bytes32,
    packed_precisions: uint256,
    packed_gamma_A: uint256,
    packed_fee_params: uint256,
    packed_rebalancing_params: uint256,
    initial_price: uint256,
):
    ...
    name = _name
    ...

symbol: public(immutable(String[32]))

@external
def __init__(
    _name: String[64],
    _symbol: String[32],
    _coins: address[N_COINS],
    _math: address,
    _salt: bytes32,
    packed_precisions: uint256,
    packed_gamma_A: uint256,
    packed_fee_params: uint256,
    packed_rebalancing_params: uint256,
    initial_price: uint256,
):
    ...
    symbol = _symbol
    ...

decimals: public(constant(uint8)) = 18

version: public(constant(String[8])) = "v2.0.0"

balanceOf: public(HashMap[address, uint256])

totalSupply: public(uint256)

event Transfer:
    sender: indexed(address)
    receiver: indexed(address)
    value: uint256

@external
def transfer(_to: address, _value: uint256) -> bool:
    """
    @dev Transfer token for a specified address
    @param _to The address to transfer to.
    @param _value The amount to be transferred.
    @return bool True on successful transfer. Reverts otherwise.
    """
    self._transfer(msg.sender, _to, _value)
    return True

@internal
def _transfer(_from: address, _to: address, _value: uint256):
    assert _to not in [self, empty(address)]

    self.balanceOf[_from] -= _value
    self.balanceOf[_to] += _value

    log Transfer(_from, _to, _value)

event Transfer:
    sender: indexed(address)
    receiver: indexed(address)
    value: uint256

@external
def transferFrom(_from: address, _to: address, _value: uint256) -> bool:
    """
    @dev Transfer tokens from one address to another.
    @param _from address The address which you want to send tokens from
    @param _to address The address which you want to transfer to
    @param _value uint256 the amount of tokens to be transferred
    @return bool True on successul transfer. Reverts otherwise.
    """
    _allowance: uint256 = self.allowance[_from][msg.sender]
    if _allowance != max_value(uint256):
        self._approve(_from, msg.sender, _allowance - _value)

    self._transfer(_from, _to, _value)
    return True

@internal
def _transfer(_from: address, _to: address, _value: uint256):
    assert _to not in [self, empty(address)]

    self.balanceOf[_from] -= _value
    self.balanceOf[_to] += _value

    log Transfer(_from, _to, _value)

event Approval:
    owner: indexed(address)
    spender: indexed(address)
    value: uint256

@external
def approve(_spender: address, _value: uint256) -> bool:
    """
    @notice Allow `_spender` to transfer up to `_value` amount
            of tokens from the caller's account.
    @param _spender The account permitted to spend up to `_value` amount of
                    caller's funds.
    @param _value The amount of tokens `_spender` is allowed to spend.
    @return bool Success
    """
    self._approve(msg.sender, _spender, _value)
    return True

@internal
def _approve(_owner: address, _spender: address, _value: uint256):
    self.allowance[_owner][_spender] = _value

    log Approval(_owner, _spender, _value)

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

event Approval:
    owner: indexed(address)
    spender: indexed(address)
    value: uint256

@external
def permit(
    _owner: address,
    _spender: address,
    _value: uint256,
    _deadline: uint256,
    _v: uint8,
    _r: bytes32,
    _s: bytes32,
) -> bool:
    """
    @notice Permit `_spender` to spend up to `_value` amount of `_owner`'s
            tokens via a signature.
    @dev In the event of a chain fork, replay attacks are prevented as
        domain separator is recalculated. However, this is only if the
        resulting chains update their chainId.
    @param _owner The account which generated the signature and is granting an
                allowance.
    @param _spender The account which will be granted an allowance.
    @param _value The approval amount.
    @param _deadline The deadline by which the signature must be submitted.
    @param _v The last byte of the ECDSA signature.
    @param _r The first 32 bytes of the ECDSA signature.
    @param _s The second 32 bytes of the ECDSA signature.
    @return bool Success.
    """
    assert _owner != empty(address)  # dev: invalid owner
    assert block.timestamp <= _deadline  # dev: permit expired

    nonce: uint256 = self.nonces[_owner]
    digest: bytes32 = keccak256(
        concat(
            b"\x19\x01",
            self._domain_separator(),
            keccak256(
                _abi_encode(
                    EIP2612_TYPEHASH, _owner, _spender, _value, nonce, _deadline
                )
            ),
        )
    )
    assert ecrecover(digest, _v, _r, _s) == _owner  # dev: invalid signature

    self.nonces[_owner] = unsafe_add(nonce, 1)  # <-- Unsafe add is safe here.
    self._approve(_owner, _spender, _value)
    return True

@internal
def _approve(_owner: address, _spender: address, _value: uint256):
    self.allowance[_owner][_spender] = _value

    log Approval(_owner, _spender, _value)

nonces: public(HashMap[address, uint256])

salt: public(immutable(bytes32))

CACHED_DOMAIN_SEPARATOR: immutable(bytes32)

@view
@external
def DOMAIN_SEPARATOR() -> bytes32:
    """
    @notice EIP712 domain separator.
    @return bytes32 Domain Separator set for the current chain.
    """
    return self._domain_separator()

@view
@internal
def _domain_separator() -> bytes32:
    if chain.id != CACHED_CHAIN_ID:
        return keccak256(
            _abi_encode(
                EIP712_TYPEHASH,
                NAME_HASH,
                VERSION_HASH,
                chain.id,
                self,
                salt,
            )
        )
    return CACHED_DOMAIN_SEPARATOR