-- The main program for cpphs, a simple C pre-processor written in Haskell.

-- Copyright (c) 2004 Malcolm Wallace
-- This file is GPL, although the libraries it uses are either standard
-- Haskell'98 or distributed under the LGPL.
module Language.Preprocessor.Cpphs.RunCpphs ( runCpphs ) where

import Language.Preprocessor.Cpphs.CppIfdef (cppIfdef)
import Language.Preprocessor.Cpphs.MacroPass(macroPass)
import Language.Preprocessor.Cpphs.Options  (CpphsOptions(..), BoolOptions(..))
import Language.Preprocessor.Unlit as Unlit (unlit)

runCpphs :: CpphsOptions -> FilePath -> String -> IO String
runCpphs options filename input = do
  let bools  = boolopts options
      preInc = case preInclude options of
                 [] -> ""
                 is -> concatMap (\f->"#include \""++f++"\"\n") is 
                       ++ "#line 1 \""++filename++"\"\n"

  pass1 <- cppIfdef filename (defines options) (includes options) bools
  pass2 <- macroPass (defines options) bools pass1
  let result= if not (macros bools) then unlines (map snd pass1) else pass2
      pass3 = if literate bools then Unlit.unlit filename else id

  return (pass3 result)