漂亮的打印haskell带注释的源代码 [英] Pretty-print haskell source code with comments

问题描述

我正在尝试重新格式化/重印haskell源代码（删除/添加空格，换行符，改变缩进样式...）。我找到了 haskell-src-exts 软件包，它可以解析和漂亮的打印haskell源代码。

使用函数 parseFileWithComments :: ParseMode - > FilePath - > IO（ParseResult（Module，[Comment]））我也收到包含在源代码中的注释。现在我想在原始位置打印带有注释的Module / AST，但是我找不到可以实现这一点的功能。我只能漂亮地打印AST。我必须自己实现AST的打印和评论吗？或者这样的库已经存在？

澄清以下示例：

文件A.hs：

 模块A（fn1）其中
 
 -  | Haddock评论
 fn1 :: 
字符串 - > 
字符串
 fn1 _ = - 另一条评论
  

在ghci中，打字

  Prelude Control.Monad.Reader Language.Haskell.Exts> （liftM prettyPrint）$（liftM fst）$（liftM fromParseResult）$ parseFileWithComments defaultParseModeA.hs`
  

<打印模块源代码（当然，没有评论）。我可以使用任何 prettyPrint - 函数来修改源代码格式。

现在我希望能够做到像这样：

  do 
（ast，comments）<  -  fromParseResult $ parseFileWithComments defaultParseModeA.hs 
 prettyPrintWithComments ast评论
  

可以获得原始文件的漂亮版本，包括评论。

解决方案

使用模块的 Annotated 版本，例如 Language.Haskell.Exts.Annotated vs Language.Haskell.Exts 。

I'm trying to reformat/reprint haskell source code (remove/add whitespace, linebreaks, change indention style...). I've found the package haskell-src-exts which can parse and pretty-print haskell source code.

Using the function parseFileWithComments :: ParseMode -> FilePath -> IO (ParseResult (Module, [Comment])) I also get the comments included in the source code. Now I want to print the Module/AST with the comments at the original positions, but I cannot find a function which will do that. I can only pretty-print the AST. Do I have to implement printing of the AST plus the comments myself or does such a library already exist?

To clarify consider following example:

file A.hs:

module A (fn1) where

-- | Haddock-comment
fn1 ::
    String ->
    String
fn1 _ = "" -- another comment

In ghci, typing

Prelude Control.Monad.Reader Language.Haskell.Exts> (liftM prettyPrint) $ (liftM fst) $ (liftM fromParseResult) $ parseFileWithComments defaultParseMode "A.hs"`

prints the module source code (without the comments, of course). I can use any prettyPrint-function to modify the source code formatting.

Now I want to be able to do something like this:

do
    (ast, comments) <- fromParseResult $ parseFileWithComments defaultParseMode "A.hs"
    prettyPrintWithComments ast comments

to get a pretty-printed version of the original file including the comments.

解决方案

Use the Annotated versions of the modules, e.g. Language.Haskell.Exts.Annotated vs Language.Haskell.Exts.

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