IUniswapExchange.sol

pragma solidity 0.5.4;

/* https://docs.uniswap.io/smart-contract-integration/interface#exchange-interface */

interface IUniswapExchange {
    // Address of ERC20 token sold on this exchange
    function tokenAddress() external view returns (address token);

    // Address of Uniswap Factory
    function factoryAddress() external view returns (address factory);

    // Provide Liquidity
    function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline)
        external
        payable
        returns (uint256);
    function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline)
        external
        returns (uint256, uint256);

    // Get Prices
    function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought);
    function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold);
    function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought);
    function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold);

    // Trade ETH to ERC20
    function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256 tokens_bought);
    function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient)
        external
        payable
        returns (uint256 tokens_bought);
    function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256 eth_sold);
    function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient)
        external
        payable
        returns (uint256 eth_sold);

    // Trade ERC20 to ETH
    function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline)
        external
        returns (uint256 eth_bought);
    function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_tokens, uint256 deadline, address recipient)
        external
        returns (uint256 eth_bought);
    function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline)
        external
        returns (uint256 tokens_sold);
    function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient)
        external
        returns (uint256 tokens_sold);

    // Trade ERC20 to ERC20
    function tokenToTokenSwapInput(
        uint256 tokens_sold,
        uint256 min_tokens_bought,
        uint256 min_eth_bought,
        uint256 deadline,
        address token_addr
    ) external returns (uint256 tokens_bought);
    function tokenToTokenTransferInput(
        uint256 tokens_sold,
        uint256 min_tokens_bought,
        uint256 min_eth_bought,
        uint256 deadline,
        address recipient,
        address token_addr
    ) external returns (uint256 tokens_bought);
    function tokenToTokenSwapOutput(
        uint256 tokens_bought,
        uint256 max_tokens_sold,
        uint256 max_eth_sold,
        uint256 deadline,
        address token_addr
    ) external returns (uint256 tokens_sold);
    function tokenToTokenTransferOutput(
        uint256 tokens_bought,
        uint256 max_tokens_sold,
        uint256 max_eth_sold,
        uint256 deadline,
        address recipient,
        address token_addr
    ) external returns (uint256 tokens_sold);
    // Trade ERC20 to Custom Pool
    function tokenToExchangeSwapInput(
        uint256 tokens_sold,
        uint256 min_tokens_bought,
        uint256 min_eth_bought,
        uint256 deadline,
        address exchange_addr
    ) external returns (uint256 tokens_bought);
    function tokenToExchangeTransferInput(
        uint256 tokens_sold,
        uint256 min_tokens_bought,
        uint256 min_eth_bought,
        uint256 deadline,
        address recipient,
        address exchange_addr
    ) external returns (uint256 tokens_bought);
    function tokenToExchangeSwapOutput(
        uint256 tokens_bought,
        uint256 max_tokens_sold,
        uint256 max_eth_sold,
        uint256 deadline,
        address exchange_addr
    ) external returns (uint256 tokens_sold);
    function tokenToExchangeTransferOutput(
        uint256 tokens_bought,
        uint256 max_tokens_sold,
        uint256 max_eth_sold,
        uint256 deadline,
        address recipient,
        address exchange_addr
    ) external returns (uint256 tokens_sold);

    // ERC20 comaptibility for liquidity tokens
    // TODO: not sure about this
    // bytes32 public name;
    function name() external view returns (bytes32);
    // bytes32 public symbol;
    function symbol() external view returns (bytes32);
    // uint256 public decimals;
    function decimals() external view returns (uint256);
    function transfer(address _to, uint256 _value) external returns (bool);
    function transferFrom(address _from, address _to, uint256 value) external returns (bool);
    function approve(address _spender, uint256 _value) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256);

    // Never use
    function setup(address token_addr) external;
}