使用megaparsec在不同位置出现多个错误 [英] multiple errors with different positions using megaparsec

问题描述

我将使用megaparsec解析大学项目的编程语言.但是，我搜寻了一种报告多个错误的方法.

I'm going to use megaparsec for parsing a programming language for university project. However, I searched for finding a way to report multiple errors.

我对withRecovery有所了解，我看到了这个问题，但是我没有找到错误发生在不同位置的情况.

I know about withRecovery and I saw this issue but I didn't find about the case where errors happen on different positions.

例如此Java代码中的:

for example in this java code :

class A
{ 
    public get() // line 3 column 10
    {
        return x // line 5 column 22
    }
}

有错误1第3行第10列的预期类型"和错误2在第5行第22列缺少分号"

There are error1 "expected type at line 3 column 10" and error2 "missing semicolon at line 5 column 22"

我知道我可以将错误消息与failure合并，但是多个位置呢?我该怎么办?

I know I can combine error messages with failure but how about multiple positions ? How do I do that ?

推荐答案

如果您确定有关Alec的建议，但又不想使用Either (ParseError ...) (Either (ParseError ...) a)，则可以对该值使用Control.Monad.join来将其转换为Either (ParseError ...) a.抱歉，如果此工具不太有用

If you're sure about Alec's suggestion, but don't want to have Either (ParseError ...) (Either (ParseError ...) a), you can just use Control.Monad.join on that value to turn it into an Either (ParseError ...) a. Sorry if this wasn't too helpful

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