如何解决ParserError:预期的pragma，导入指令或契约/接口/库/结构/enum/常量/函数/错误定义.在s

Question

我很成功地运行了我的拍卖代码，直到一些键被按下，现在这个错误开始显示，我无法弄清楚为什么这个错误显示

ParserError: Expected pragma, import directive or contract/interface/library/struct/enum/constant/function/error definition.

错误出现在声明事件的第79行

我检查我的pragma语句它的pragma可靠性>=0.7.0 <0.9.0;

pragma solidity >=0.7.0 <0.9.0;
contract Auction {
address payable internal auction_owner; 
uint256 public auction_start; 
uint256 public auction_end; 
uint256 public highestBid;
address public highestBidder;
enum auction_state {
CANCELLED, STARTED,ENDED
}
address[] bidders;
mapping(address => uint) public bids; 
auction_state public STATE;

modifier an_ongoing_auction() { require(block.timestamp <= auction_end);
_;
}
modifier only_owner() { require(msg.sender == auction_owner);
_;
}
function MyAuction (uint _biddingTime, address payable  _owner) public {
auction_owner = _owner; 
auction_start = block.timestamp;
auction_end = auction_start + _biddingTime* 1 minutes;
STATE = auction_state.STARTED;
if (block.timestamp>auction_end){
STATE=auction_state.ENDED;
auction_owner.transfer(highestBid);
bids[highestBidder]=0;

} 
}
function bid() public payable an_ongoing_auction returns (bool){ 
require(bids[msg.sender] + msg.value > highestBid, "can't bid, Make a higher Bid" );
highestBidder = msg.sender; 
highestBid = msg.value; 
bidders.push(msg.sender);
bids[msg.sender] = bids[msg.sender] + msg.value; 
emit BidEvent(highestBidder, highestBid);
return true; 
}

}
function withdraw() public payable returns (bool){
// address payable rec = msg.sender;
require(block.timestamp > auction_end , "can't withdraw, Auction is still open");
uint amount= bids[msg.sender];
bids[msg.sender] = 0; 
payable(msg.sender).transfer(amount); 
emit WithdrawalEvent(msg.sender, amount);
return true;
}
function cancel_auction() only_owner an_ongoing_auction public returns (bool) {
STATE = auction_state.CANCELLED;
emit CanceledEvent("Auction Cancelled", block.timestamp,highestBid); 
return true;
}
function time_remain() an_ongoing_auction public view returns (uint256){
uint256 timeleft= auction_end - block.timestamp;
return timeleft; 
}
event BidEvent(address highestBidder, uint256 highestBid); 
event WithdrawalEvent(address withdrawer, uint256 amount);
event CanceledEvent(string message, uint256 time, uint256 highestBid);
}

Answer 1

对您的代码进行快速复制和粘贴以进行重新混合，可以发现您在bid函数之后有一个错位的右括号。如果你去掉那个错位的右括号，你的代码应该可以正确编译。

Answer 2

您需要清理和样式化您的代码，以便于发现错误。和solid需要指定SPDX许可证以避免警告，代码应该如下:

//SPDX-License-Identifier: Unlicense
pragma solidity >=0.7.0 <0.9.0;
contract Auction {
address payable internal auction_owner; 
uint256 public auction_start; 
uint256 public auction_end; 
uint256 public highestBid;
address public highestBidder;
enum auction_state {
CANCELLED, STARTED,ENDED
}
address[] bidders;
mapping(address => uint) public bids; 
auction_state public STATE;

modifier an_ongoing_auction() { require(block.timestamp <= auction_end);
_;
}
modifier only_owner() { require(msg.sender == auction_owner);
_;
}
function MyAuction (uint _biddingTime, address payable  _owner) public {
auction_owner = _owner; 
auction_start = block.timestamp;
auction_end = auction_start + _biddingTime* 1 minutes;
STATE = auction_state.STARTED;
if (block.timestamp>auction_end){
STATE=auction_state.ENDED;
auction_owner.transfer(highestBid);
bids[highestBidder]=0;

} 
}
function bid() public payable an_ongoing_auction returns (bool){ 
require(bids[msg.sender] + msg.value > highestBid, "can't bid, Make a higher Bid" );
highestBidder = msg.sender; 
highestBid = msg.value; 
bidders.push(msg.sender);
bids[msg.sender] = bids[msg.sender] + msg.value; 
emit BidEvent(highestBidder, highestBid);
return true; 
}

function withdraw() public payable returns (bool){
// address payable rec = msg.sender;
require(block.timestamp > auction_end , "can't withdraw, Auction is still open");
uint amount= bids[msg.sender];
bids[msg.sender] = 0; 
payable(msg.sender).transfer(amount); 
emit WithdrawalEvent(msg.sender, amount);
return true;
}
function cancel_auction() only_owner an_ongoing_auction public returns (bool) {
STATE = auction_state.CANCELLED;
emit CanceledEvent("Auction Cancelled", block.timestamp,highestBid); 
return true;
}
function time_remain() an_ongoing_auction public view returns (uint256){
uint256 timeleft= auction_end - block.timestamp;
return timeleft; 
}
event BidEvent(address highestBidder, uint256 highestBid); 
event WithdrawalEvent(address withdrawer, uint256 amount);
event CanceledEvent(string message, uint256 time, uint256 highestBid);

}