[Haskell-cafe] Re: Layout to non-layout code

3 Nov 2007


      ...
...
Hi,
(...)
So, I wonder: would it be possible to implement
a feature in, say, ghc, that would take code
from input and output the same code with layout
replaced by delimiting characters? (...)
ghc -ddump-parsed does this, iirc.
So does the Language.Haskell library. See this
wiki page on indenting for more ideas,
http://haskell.org/haskellwiki/Indent
-- Don
I was impressed after your tip about
'Language.Haskell'. In a few minutes, I got my
dream Haskell formatter. Here it is, parsed by
itself. Thanks for your tip.

module Main (Main.main) where
{ import System.IO;
   import Language.Haskell.Parser;
   import Language.Haskell.Pretty;
   import Text.PrettyPrint.HughesPJ;

   main :: IO ();
   main
      = do
        { program <- getContents;
          ParseOk parse <- return $
                              parseModule program;
          estilo <- return $ Style PageMode 50 1.0;
          modo <- return $
                     PPHsMode 0 0 0 0 0 3 True
                        PPSemiColon
                        False
                        True;
          putStrLn $
             prettyPrintStyleMode estilo modo
                parse}}

[Haskell-cafe] Re: Layout to non-layout code

Maurí­cio

Maurício