(* Copyright (c) 2008, Adam Chlipala
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - The names of contributors may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *)

(* Laconic/Web language parser *)

structure Compiler :> COMPILER = struct 

structure LacwebLrVals = LacwebLrValsFn(structure Token = LrParser.Token)
structure Lex = LacwebLexFn(structure Tokens = LacwebLrVals.Tokens)
structure LacwebP = Join(structure ParserData = LacwebLrVals.ParserData
                         structure Lex = Lex
                         structure LrParser = LrParser)

fun parseLig filename =
    let
        val fname = OS.FileSys.tmpName ()
        val outf = TextIO.openOut fname
        val () = TextIO.output (outf, "sig\n")
        val inf = TextIO.openIn filename
        fun loop () =
            case TextIO.inputLine inf of
                NONE => ()
              | SOME line => (TextIO.output (outf, line);
                              loop ())
        val () = loop ()
        val () = TextIO.closeIn inf
        val () = TextIO.closeOut outf

        val () = (ErrorMsg.resetErrors ();
                  ErrorMsg.resetPositioning filename)
	val file = TextIO.openIn fname
	fun get _ = TextIO.input file
	fun parseerror (s, p1, p2) = ErrorMsg.errorAt' (p1, p2) s
	val lexer = LrParser.Stream.streamify (Lex.makeLexer get)
	val (absyn, _) = LacwebP.parse (30, lexer, parseerror, ())
    in
        TextIO.closeIn file;
        if ErrorMsg.anyErrors () then
            NONE
        else
            case absyn of
                [(Source.DSgn ("?", (Source.SgnConst sgis, _)), _)] => SOME sgis
              | _ => NONE
    end
    handle LrParser.ParseError => NONE

fun testLig fname =
    case parseLig fname of
        NONE => ()
      | SOME sgis =>
        app (fn sgi => (Print.print (SourcePrint.p_sgn_item sgi);
                        print "\n")) sgis

(* The main parsing routine *)
fun parseLac filename =
    let
        val () = (ErrorMsg.resetErrors ();
                  ErrorMsg.resetPositioning filename)
	val file = TextIO.openIn filename
	fun get _ = TextIO.input file
	fun parseerror (s, p1, p2) = ErrorMsg.errorAt' (p1, p2) s
	val lexer = LrParser.Stream.streamify (Lex.makeLexer get)
	val (absyn, _) = LacwebP.parse (30, lexer, parseerror, ())
    in
        TextIO.closeIn file;
        if ErrorMsg.anyErrors () then
            NONE
        else
            case absyn of
                [(Source.DSgn ("?", _), _)] =>
                (ErrorMsg.error "File starts with 'sig'";
                 NONE)
              | _ => SOME absyn
    end
    handle LrParser.ParseError => NONE

fun testLac fname =
    case parseLac fname of
        NONE => ()
      | SOME file => (Print.print (SourcePrint.p_file file);
                      print "\n")

type job = string list

fun capitalize "" = ""
  | capitalize s = str (Char.toUpper (String.sub (s, 0))) ^ String.extract (s, 1, NONE)

fun parse fnames =
    let
        fun parseOne fname =
            let
                val mname = capitalize (OS.Path.file fname)
                val lac = OS.Path.joinBaseExt {base = fname, ext = SOME "lac"}
                val lig = OS.Path.joinBaseExt {base = fname, ext = SOME "lig"}

                val sgnO =
                    if Posix.FileSys.access (lig, []) then
                        case parseLig lig of
                            NONE => NONE
                          | SOME sgis => SOME (Source.SgnConst sgis, {file = lig,
                                                                      first = ErrorMsg.dummyPos,
                                                                      last = ErrorMsg.dummyPos})
                    else
                        NONE

                val loc = {file = lac,
                           first = ErrorMsg.dummyPos,
                           last = ErrorMsg.dummyPos}
            in
                case parseLac lac of
                    NONE => NONE
                  | SOME ds =>
                    SOME (Source.DStr (mname, sgnO, (Source.StrConst ds, loc)), loc)
            end

        val ds = List.mapPartial parseOne fnames            
    in
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME ds
    end

fun elaborate job =
    case parseLig "lib/basis.lig" of
        NONE => NONE
      | SOME empty =>
        case parse job of
            NONE => NONE
          | SOME file =>
            let
                val out = Elaborate.elabFile empty ElabEnv.empty file
            in
                if ErrorMsg.anyErrors () then
                    NONE
                else
                    SOME out
            end

fun explify job =
    case elaborate job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Explify.explify file)

fun corify job =
    case explify job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Corify.corify file)

fun shake' job =
    case corify job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Shake.shake file)

fun reduce job =
    case corify job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Reduce.reduce (Shake.shake file))

fun shake job =
    case reduce job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Shake.shake file)

fun monoize job =
    case shake job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Monoize.monoize CoreEnv.empty file)

fun cloconv job =
    case monoize job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Cloconv.cloconv file)

fun cjrize job =
    case cloconv job of
        NONE => NONE
      | SOME file =>
        if ErrorMsg.anyErrors () then
            NONE
        else
            SOME (Cjrize.cjrize file)

fun testParse job =
    case parse job of
        NONE => print "Failed\n"
      | SOME file =>
        (Print.print (SourcePrint.p_file file);
         print "\n")

fun testElaborate job =
    (case elaborate job of
         NONE => print "Failed\n"
       | SOME file =>
         (print "Succeeded\n";
          Print.print (ElabPrint.p_file ElabEnv.empty file);
          print "\n"))
    handle ElabEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testExplify job =
    (case explify job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (ExplPrint.p_file ExplEnv.empty file);
          print "\n"))
    handle ExplEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testCorify job =
    (case corify job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (CorePrint.p_file CoreEnv.empty file);
          print "\n"))
    handle CoreEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testShake' job =
    (case shake' job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (CorePrint.p_file CoreEnv.empty file);
          print "\n"))
    handle CoreEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testReduce job =
    (case reduce job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (CorePrint.p_file CoreEnv.empty file);
          print "\n"))
    handle CoreEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testShake job =
    (case shake job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (CorePrint.p_file CoreEnv.empty file);
          print "\n"))
    handle CoreEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testMonoize job =
    (case monoize job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (MonoPrint.p_file MonoEnv.empty file);
          print "\n"))
    handle MonoEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testCloconv job =
    (case cloconv job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (FlatPrint.p_file FlatEnv.empty file);
          print "\n"))
    handle FlatEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun testCjrize job =
    (case cjrize job of
         NONE => print "Failed\n"
       | SOME file =>
         (Print.print (CjrPrint.p_file CjrEnv.empty file);
          print "\n"))
    handle CjrEnv.UnboundNamed n =>
           print ("Unbound named " ^ Int.toString n ^ "\n")

fun compile job =
    case cjrize job of
        NONE => ()
      | SOME file =>
        let
            val outf = TextIO.openOut "/tmp/lacweb.c"
            val s = TextIOPP.openOut {dst = outf, wid = 80}
        in
            Print.fprint s (CjrPrint.p_file CjrEnv.empty file);
            TextIO.closeOut outf
        end

end