(* main.sml
 *
 * COPYRIGHT (c) 2010 The Diderot Project (http://diderot-language.cs.uchicago.edu)
 * All rights reserved.
 *)

structure Main : sig

    val main : (string * string list) -> OS.Process.status

    val test : string -> unit

  end = struct

    structure HighPP = SSAPPFn (HighIL)
    structure MidPP = SSAPPFn (MidIL)
    structure LowPP = SSAPPFn (LowIL)

    fun err s = TextIO.output (TextIO.stdErr, s)
    fun err1 c =  TextIO.output1 (TextIO.stdErr, c)
    fun errnl s = (err s; err1 #"\n")

    exception ERROR

    fun quitWithError srcFile = raise Fail("Error in compiling " ^ srcFile)

  (* check for errors and report them if there are any *)
    fun checkForErrors errStrm = (
	  Error.report (TextIO.stdErr, errStrm);
	  if Error.anyErrors errStrm
	    then quitWithError (Error.sourceFile errStrm)
	    else ())

    fun doFile filename = let
	  val errStrm = Error.mkErrStream filename
	  val inS = TextIO.openIn filename
	  val checkTypes = Typechecker.check errStrm
	(***** PARSING *****)
	  val parseTree = let
		val pt = Parser.parseFile (errStrm, inS)
		in
		  TextIO.closeIn inS;
		  checkForErrors errStrm;
		  valOf pt
		end
	  val _ = checkForErrors errStrm
	(***** TYPECHECKING *****)
	  val ast = (checkTypes parseTree) handle Typechecker.Error => AST.Program[]
	  val _ = checkForErrors errStrm
	  val _ = ASTPP.output (Log.logFile(), ast) (* DEBUG *)
	(***** SIMPLIFY *****)
	  val simple = Simplify.transform ast
	  val _ = SimplePP.output (Log.logFile(), simple) (* DEBUG *)
	(***** TRANSLATION TO HIGH IL*****)
	  val highIL = Translate.translate simple
	  val _ = ( (* DEBUG *)
		HighPP.output (Log.logFile(), "HighIL after translation", highIL);
		if CheckHighIL.check ("after translation", highIL)
		  then quitWithError filename
		  else ())
	(***** HIGH-IL OPTIMIZATION *****)
	  val highIL = HighOptimizer.optimize highIL
	  val _ = ( (* DEBUG *)
		HighPP.output (Log.logFile(), "HighIL after optimization", highIL);
		if CheckHighIL.check ("after optimization", highIL)
		  then quitWithError filename
		  else ())
	(***** TRANSLATION TO MID IL *****)
	  val midIL = HighToMid.translate highIL
	  val _ = ( (* DEBUG *)
		MidPP.output (Log.logFile(), "MidIL after translation", midIL);
		if CheckMidIL.check ("after translation", midIL)
		  then quitWithError filename
		  else ())
	(***** TRANSLATION TO LOW IL *****)
	  val lowIL = MidToLow.translate midIL
	  val _ = ( (* DEBUG *)
		LowPP.output (Log.logFile(), "LowIL after translation", lowIL);
		if CheckLowIL.check ("after translation", lowIL)
		  then quitWithError filename
		  else ())
	  in
	    () (* FIXME *)
	  end

    fun doOptions args = let
	  val log = ref false
	  val defs = ref []
	  fun doOpts [file] = {log = !log, defs = !defs, file = file}
	    | doOpts ("-log"::r) = (log := true; doOpts r)
	    | doOpts (opt::r) = 
		if Inputs.isCmdLineInput opt
		  then (defs := opt :: !defs; doOpts r)
		  else (
		    err(concat["invalid command-line input \"", opt, "\"\n"]);
		    raise ERROR)
	  in
	    doOpts args
	  end

    fun main (name: string, args: string list) = let
	  val {log, defs, file} = doOptions args
	  val {base, ...} = OS.Path.splitBaseExt file
	  in
	    if Inputs.initFromArgs defs
	      then (Log.init(base ^ ".log"); doFile file; OS.Process.success)
		handle exn => (
		  err (concat [
		      "uncaught exception ", General.exnName exn, " [", General.exnMessage exn, "]\n"]);
		      List.app (fn s => err (concat ["  raised at ", s, "\n"]))
			(SMLofNJ.exnHistory exn);
		      OS.Process.failure)
	      else (err "invalid command-line inputs\n"; OS.Process.failure)
	  end
	    handle ERROR => OS.Process.failure

    fun test file = (main ("", [file]); print "** Success!!\n")

  end