81 lines
3.2 KiB
Nim
81 lines
3.2 KiB
Nim
import pkg/stint
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import pkg/ethers
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export stint
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export ethers
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type
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Erc20Token* = ref object of Contract
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Transfer* = object of Event
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sender* {.indexed.}: Address
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receiver* {.indexed.}: Address
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value*: UInt256
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Approval* = object of Event
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owner* {.indexed.}: Address
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spender* {.indexed.}: Address
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value*: UInt256
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method name*(token: Erc20Token): string {.base, contract, view.}
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## Returns the name of the token.
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method symbol*(token: Erc20Token): string {.base, contract, view.}
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## Returns the symbol of the token, usually a shorter version of the name.
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method decimals*(token: Erc20Token): uint8 {.base, contract, view.}
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## Returns the number of decimals used to get its user representation.
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## For example, if `decimals` equals `2`, a balance of `505` tokens should
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## be displayed to a user as `5.05` (`505 / 10 ** 2`).
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method totalSupply*(token: Erc20Token): UInt256 {.base, contract, view.}
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## Returns the amount of tokens in existence.
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method balanceOf*(token: Erc20Token,
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account: Address): UInt256 {.base, contract, view.}
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## Returns the amount of tokens owned by `account`.
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method allowance*(token: Erc20Token,
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owner: Address,
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spender: Address): UInt256 {.base, contract, view.}
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## Returns the remaining number of tokens that `spender` will be allowed
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## to spend on behalf of `owner` through {transferFrom}. This is zero by
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## default.
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##
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## This value changes when {approve} or {transferFrom} are called.
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method transfer*(token: Erc20Token,
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recipient: Address,
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amount: UInt256): ?TransactionResponse {.base, contract.}
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## Moves `amount` tokens from the caller's account to `recipient`.
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method approve*(token: Erc20Token,
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spender: Address,
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amount: UInt256): ?TransactionResponse {.base, contract.}
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## Sets `amount` as the allowance of `spender` over the caller's tokens.
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method increaseAllowance*(token: Erc20Token,
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spender: Address,
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addedValue: UInt256): ?TransactionResponse {.base, contract.}
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## Atomically increases the allowance granted to spender by the caller.
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## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
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## Emits an Approval event indicating the updated allowance.
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##
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## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
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method decreaseAllowance*(token: Erc20Token,
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spender: Address,
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addedValue: UInt256): ?TransactionResponse {.base, contract.}
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## Atomically decreases the allowance granted to spender by the caller.
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## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
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## Emits an Approval event indicating the updated allowance.
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##
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## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
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method transferFrom*(token: Erc20Token,
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spender: Address,
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recipient: Address,
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amount: UInt256): ?TransactionResponse {.base, contract.}
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## Moves `amount` tokens from `from` to `to` using the allowance
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## mechanism. `amount` is then deducted from the caller's allowance.
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