--  C->Haskell Compiler: interface to C processing routines
--
--  Author : Manuel M. T. Chakravarty
--  Created: 12 August 99
--
--  Version $Revision: 1.3 $ from $Date: 2005/06/22 16:01:20 $
--
--  Copyright (c) 1999 Manuel M. T. Chakravarty
--
--  This file is free software; you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation; either version 2 of the License, or
--  (at your option) any later version.
--
--  This file is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--- DESCRIPTION ---------------------------------------------------------------
--
--  This modules provides access to the C processing routines for the rest of
--  the compiler.
--
--- DOCU ----------------------------------------------------------------------
--
--  language: Haskell 98
--
--- TODO ----------------------------------------------------------------------
--
--

module C (-- interface to KL for all non-KL modules
	  --
	  -- stuff from `Common' (reexported)
	  --
	  Pos(posOf), 
	  --	      
	  -- structure tree
	  --
	  module CAST,
	  --
	  -- attributed structure tree with operations (reexported from
	  -- `CAttrs')
	  --
	  AttrC, getCHeader, 
	  CObj(..), CTag(..), CDef(..), lookupDefObjC, lookupDefTagC,
	  getDefOfIdentC,
	  --
	  -- support for C structure tree traversals
	  --
	  module CTrav,
	  --
	  -- support for pretty printing C abstract trees
	  --
	  module CPretty,
	  --
	  loadAttrC,		-- locally defined
	  --
	  -- misc. reexported stuff
	  --
	  Ident, Attrs, Attr(..),
	  --
	  -- misc. own stuff
	  --
	  csuffix, hsuffix, isuffix)
where

import Position   (Position(..), Pos(posOf))
import Idents	  (Ident, lexemeToIdent)
import Attributes (Attrs, Attr(..))

import C2HSState  (CST, IOMode(..),
		   readCST, transCST, runCST, nop,
		   readFileCIO, writeFileCIO, openFileCIO, hCloseCIO,
		   fatal, errorsPresent, showErrors,
		   Traces(..), putTraceStr)
import CAST
import CParser    (parseC)
import CPretty
import CAttrs	  (AttrC, attrC, getCHeader, 
		   CObj(..), CTag(..), CDef(..), lookupDefObjC, lookupDefTagC,
		   getDefOfIdentC)
import CNames     (nameAnalysis)
import CTrav


-- suffix for files containing C (EXPORTED)
--
csuffix, hsuffix, isuffix :: String
csuffix  = ".c"
hsuffix  = ".h"
isuffix  = ".i"

-- given a file name (with suffix), parse that file as a C header and do the
-- static analysis (collect defined names) (EXPORTED)
--
-- * currently, lexical and syntactical errors are reported immediately and 
--   abort the program; others are reported as part of the fatal error message;
--   warnings are returned together with the read unit
--
loadAttrC       :: String -> CST s (AttrC, String)
loadAttrC fname  = do
		     -- read file
		     --
		     traceInfoRead fname
		     contents <- readFileCIO fname

		     -- parse
		     --
		     traceInfoParse
		     rawHeader <- parseC contents (Position fname 1 1)
		     let header = attrC rawHeader

		     -- name analysis
		     --
		     traceInfoNA
		     headerWithAttrs <- nameAnalysis header

		     -- check for errors and finalize
		     --
		     errs <- errorsPresent
		     if errs
		       then do
			 traceInfoErr
			 errmsgs <- showErrors
			 fatal ("C header contains \
				\errors:\n\n" ++ errmsgs)   -- fatal error
		       else do
			 traceInfoOK
			 warnmsgs <- showErrors
			 return (headerWithAttrs, warnmsgs)
		    where
		      traceInfoRead fname = putTraceStr tracePhasesSW
					      ("Attempting to read file `"
					       ++ fname ++ "'...\n")
		      traceInfoParse      = putTraceStr tracePhasesSW 
					      ("...parsing `" 
					       ++ fname ++ "'...\n")
		      traceInfoNA         = putTraceStr tracePhasesSW 
					      ("...name analysis of `" 
					       ++ fname ++ "'...\n")
		      traceInfoErr        = putTraceStr tracePhasesSW
					      ("...error(s) detected in `"
					       ++ fname ++ "'.\n")
		      traceInfoOK         = putTraceStr tracePhasesSW
					      ("...successfully loaded `"
					       ++ fname ++ "'.\n")