nim-ethers/ethers/erc20.nim

81 lines
3.2 KiB
Nim

import pkg/stint
import pkg/ethers
export stint
export ethers
type
Erc20Token* = ref object of Contract
Transfer* = object of Event
sender* {.indexed.}: Address
receiver* {.indexed.}: Address
value*: UInt256
Approval* = object of Event
owner* {.indexed.}: Address
spender* {.indexed.}: Address
value*: UInt256
method name*(token: Erc20Token): string {.base, contract, view.}
## Returns the name of the token.
method symbol*(token: Erc20Token): string {.base, contract, view.}
## Returns the symbol of the token, usually a shorter version of the name.
method decimals*(token: Erc20Token): uint8 {.base, contract, view.}
## 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`).
method totalSupply*(token: Erc20Token): UInt256 {.base, contract, view.}
## Returns the amount of tokens in existence.
method balanceOf*(token: Erc20Token,
account: Address): UInt256 {.base, contract, view.}
## Returns the amount of tokens owned by `account`.
method allowance*(token: Erc20Token,
owner: Address,
spender: Address): UInt256 {.base, contract, view.}
## Returns the remaining number of tokens that `spender` will be allowed
## to spend on behalf of `owner` through {transferFrom}. This is zero by
## default.
##
## This value changes when {approve} or {transferFrom} are called.
method transfer*(token: Erc20Token,
recipient: Address,
amount: UInt256): Confirmable {.base, contract.}
## Moves `amount` tokens from the caller's account to `recipient`.
method approve*(token: Erc20Token,
spender: Address,
amount: UInt256): Confirmable {.base, contract.}
## Sets `amount` as the allowance of `spender` over the caller's tokens.
method increaseAllowance*(token: Erc20Token,
spender: Address,
addedValue: UInt256): Confirmable {.base, contract.}
## 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.
##
## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
method decreaseAllowance*(token: Erc20Token,
spender: Address,
addedValue: UInt256): Confirmable {.base, contract.}
## 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.
##
## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
method transferFrom*(token: Erc20Token,
spender: Address,
recipient: Address,
amount: UInt256): Confirmable {.base, contract.}
## Moves `amount` tokens from `spender` to `recipient` using the allowance
## mechanism. `amount` is then deducted from the caller's allowance.