(* 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.
 *)

(* Ur/Web language parser *)

structure Compiler :> COMPILER = struct 

structure UrwebLrVals = UrwebLrValsFn(structure Token = LrParser.Token)
structure Lex = UrwebLexFn(structure Tokens = UrwebLrVals.Tokens)
structure UrwebP = Join(structure ParserData = UrwebLrVals.ParserData
                         structure Lex = Lex
                         structure LrParser = LrParser)

type job = {
     prefix : string,
     database : string option,
     sources : string list,
     exe : string,
     sql : string option,
     debug : bool,
     profile : bool
}

type ('src, 'dst) phase = {
     func : 'src -> 'dst,
     print : 'dst -> Print.PD.pp_desc
}

type pmap = (string * Time.time) list

type ('src, 'dst) transform = {
     func : 'src -> 'dst option,
     print : 'dst -> Print.PD.pp_desc,
     time : 'src * pmap -> 'dst option * pmap
}

fun transform (ph : ('src, 'dst) phase) name = {
    func = fn input => let
                  val v = #func ph input
              in
                  if ErrorMsg.anyErrors () then
                      NONE
                  else
                      SOME v
              end,
    print = #print ph,
    time = fn (input, pmap) => let
                  val befor = Time.now ()
                  val v = #func ph input
                  val elapsed = Time.- (Time.now (), befor)
              in
                  (if ErrorMsg.anyErrors () then
                       NONE
                   else
                       SOME v,
                   (name, elapsed) :: pmap)
              end
}

fun op o (tr2 : ('b, 'c) transform, tr1 : ('a, 'b) transform) = {
    func = fn input => case #func tr1 input of
                           NONE => NONE
                         | SOME v => #func tr2 v,
    print = #print tr2,
    time = fn (input, pmap) => let
                  val (ro, pmap) = #time tr1 (input, pmap)
              in
                  case ro of
                      NONE => (NONE, pmap)
                    | SOME v => #time tr2 (v, pmap)
              end
}

fun check (tr : ('src, 'dst) transform) x = (ErrorMsg.resetErrors ();
                                             ignore (#func tr x))

fun run (tr : ('src, 'dst) transform) x = (ErrorMsg.resetErrors ();
                                           #func tr x)

fun runPrint (tr : ('src, 'dst) transform) input =
    (ErrorMsg.resetErrors ();
     case #func tr input of
         NONE => print "Failure\n"
       | SOME v =>
         (print "Success\n";
          Print.print (#print tr v);
          print "\n"))

fun time (tr : ('src, 'dst) transform) input =
    let
        val (_, pmap) = #time tr (input, [])
    in
        app (fn (name, time) =>
                print (name ^ ": " ^ LargeReal.toString (Time.toReal time) ^ "\n")) (rev pmap);
        print ("TOTAL: " ^ LargeReal.toString (Time.toReal (foldl Time.+ Time.zeroTime (map #2 pmap))) ^ "\n");
        print "\n"
    end

fun timePrint (tr : ('src, 'dst) transform) input =
    let
        val (ro, pmap) = #time tr (input, [])
    in
        app (fn (name, time) =>
                print (name ^ ": " ^ LargeReal.toString (Time.toReal time) ^ "\n")) (rev pmap);
        print ("TOTAL: " ^ LargeReal.toString (Time.toReal (foldl Time.+ Time.zeroTime (map #2 pmap))) ^ "\n");
        print "\n";
        case ro of
            NONE => print "Failure\n"
          | SOME v =>
            (print "Success\n";
             Print.print (#print tr v);
             print "\n")
    end

val parseUrs =
    {func = fn 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;
                             Lex.UserDeclarations.initialize ())
	           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, _) = UrwebP.parse (30, lexer, parseerror, ())
               in
                   TextIO.closeIn file;
                   case absyn of
                       [(Source.DSgn ("?", (Source.SgnConst sgis, _)), _)] => sgis
                     | _ => (ErrorMsg.errorAt {file = filename,
                                               first = {line = 0,
                                                        char = 0},
                                               last = {line = 0,
                                                       char = 0}} "Not a signature";
                             [])
               end
               handle LrParser.ParseError => [],
     print = Print.p_list_sep Print.PD.newline SourcePrint.p_sgn_item}

(* The main parsing routine *)
val parseUr = {
    func = fn filename =>
              let
                  val () = (ErrorMsg.resetErrors ();
                            ErrorMsg.resetPositioning filename;
                            Lex.UserDeclarations.initialize ())
	          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, _) = UrwebP.parse (30, lexer, parseerror, ())
              in
                  TextIO.closeIn file;
                  case absyn of
                      [(Source.DSgn ("?", _), _)] =>
                      (ErrorMsg.errorAt {file = filename,
                                         first = {line = 0,
                                                  char = 0},
                                         last = {line = 0,
                                                 char = 0}} "File starts with 'sig'";
                       [])
                    | _ => absyn
              end
              handle LrParser.ParseError => [],
     print = SourcePrint.p_file}    

fun p_job {prefix, database, exe, sql, sources, debug, profile} =
    let
        open Print.PD
        open Print
    in
        box [if debug then
                 box [string "DEBUG", newline]
             else
                 box [],
             if profile then
                 box [string "PROFILE", newline]
             else
                 box [],
             case database of
                 NONE => string "No database."
               | SOME db => string ("Database: " ^ db),
             newline,
             string "Exe: ",
             string exe,
             newline,
             case sql of
                 NONE => string "No SQL file."
               | SOME sql => string ("SQL fle: " ^ sql),
             string "Sources:",
             p_list string sources,
             newline]
    end

fun trim s =
    let
        val (_, s) = Substring.splitl Char.isSpace s
        val (s, _) = Substring.splitr Char.isSpace s
    in
        s
    end

val parseUrp = {
    func = fn filename =>
              let
                  val dir = OS.Path.dir filename
                  val inf = TextIO.openIn (OS.Path.joinBaseExt {base = filename, ext = SOME "urp"})

                  fun relify fname =
                      OS.Path.concat (dir, fname)
                      handle OS.Path.Path => fname

                  fun readSources acc =
                      case TextIO.inputLine inf of
                          NONE => rev acc
                        | SOME line =>
                          let
                              val acc = if CharVector.all Char.isSpace line then
                                            acc
                                        else
                                            let
                                                val fname = String.implode (List.filter (fn x => not (Char.isSpace x))
                                                                                        (String.explode line))
                                                val fname = relify fname
                                            in
                                                fname :: acc
                                            end
                          in
                              readSources acc
                          end

                  fun finish (prefix, database, exe, sql, debug, profile, sources) =
                      {prefix = Option.getOpt (prefix, "/"),
                       database = database,
                       exe = Option.getOpt (exe, OS.Path.joinBaseExt {base = OS.Path.base filename,
                                                                      ext = SOME "exe"}),
                       sql = sql,
                       debug = debug,
                       profile = profile,
                       sources = sources}

                  fun read (prefix, database, exe, sql, debug, profile) =
                      case TextIO.inputLine inf of
                          NONE => finish (prefix, database, exe, sql, debug, profile, [])
                        | SOME "\n" => finish (prefix, database, exe, sql, debug, profile, readSources [])
                        | SOME line =>
                          let
                              val (cmd, arg) = Substring.splitl (fn x => not (Char.isSpace x)) (Substring.full line)
                              val cmd = Substring.string (trim cmd)
                              val arg = Substring.string (trim arg)
                          in
                              case cmd of
                                  "prefix" =>
                                  (case prefix of
                                       NONE => ()
                                     | SOME _ => ErrorMsg.error "Duplicate 'prefix' directive";
                                   read (SOME arg, database, exe, sql, debug, profile))
                                | "database" =>
                                  (case database of
                                       NONE => ()
                                     | SOME _ => ErrorMsg.error "Duplicate 'database' directive";
                                   read (prefix, SOME arg, exe, sql, debug, profile))
                                | "exe" =>
                                  (case exe of
                                       NONE => ()
                                     | SOME _ => ErrorMsg.error "Duplicate 'exe' directive";
                                   read (prefix, database, SOME (relify arg), sql, debug, profile))
                                | "sql" =>
                                  (case sql of
                                       NONE => ()
                                     | SOME _ => ErrorMsg.error "Duplicate 'sql' directive";
                                   read (prefix, database, exe, SOME (relify arg), debug, profile))
                                | "debug" => read (prefix, database, exe, sql, true, profile)
                                | "profile" => read (prefix, database, exe, sql, debug, true)
                                | _ => (ErrorMsg.error ("Unrecognized command '" ^ cmd ^ "'");
                                        read (prefix, database, exe, sql, debug, profile))
                          end

                  val job = read (NONE, NONE, NONE, NONE, false, false)
              in
                  TextIO.closeIn inf;
                  Monoize.urlPrefix := #prefix job;
                  job
              end,
    print = p_job
}

val toParseJob = transform parseUrp "parseJob"

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

val parse = {
    func = fn {database, sources = fnames, ...} : job =>
              let
                  fun nameOf fname = capitalize (OS.Path.file fname)

                  fun parseOne fname =
                      let
                          val mname = nameOf fname
                          val ur = OS.Path.joinBaseExt {base = fname, ext = SOME "ur"}
                          val urs = OS.Path.joinBaseExt {base = fname, ext = SOME "urs"}

                          val sgnO =
                              if Posix.FileSys.access (urs, []) then
                                  SOME (Source.SgnConst (#func parseUrs urs),
                                        {file = urs,
                                         first = ErrorMsg.dummyPos,
                                         last = ErrorMsg.dummyPos})
                              else
                                  NONE

                          val loc = {file = ur,
                                     first = ErrorMsg.dummyPos,
                                     last = ErrorMsg.dummyPos}

                          val ds = #func parseUr ur
                      in
                          (Source.DStr (mname, sgnO, (Source.StrConst ds, loc)), loc)
                      end

                  val ds = map parseOne fnames
              in
                  let
                      val final = nameOf (List.last fnames)

                      val ds = ds @ [(Source.DExport (Source.StrVar final, ErrorMsg.dummySpan), ErrorMsg.dummySpan)]
                  in
                      case database of
                          NONE => ds
                        | SOME s => (Source.DDatabase s, ErrorMsg.dummySpan) :: ds
                  end handle Empty => ds
              end,
    print = SourcePrint.p_file
}

val toParse = transform parse "parse" o toParseJob

fun libFile s = OS.Path.joinDirFile {dir = Config.libUr,
                                     file = s}
fun clibFile s = OS.Path.joinDirFile {dir = Config.libC,
                                      file = s}

val elaborate = {
    func = fn file => let
                  val basis = #func parseUrs (libFile "basis.urs")
                  val topSgn = #func parseUrs (libFile "top.urs")
                  val topStr = #func parseUr (libFile "top.ur")
              in
                  Elaborate.elabFile basis topStr topSgn ElabEnv.empty file
              end,
    print = ElabPrint.p_file ElabEnv.empty
}

val toElaborate = transform elaborate "elaborate" o toParse

val unnest = {
    func = Unnest.unnest,
    print = ElabPrint.p_file ElabEnv.empty
}

val toUnnest = transform unnest "unnest" o toElaborate

val termination = {
    func = (fn file => (Termination.check file; file)),
    print = ElabPrint.p_file ElabEnv.empty
}

val toTermination = transform termination "termination" o toUnnest

val explify = {
    func = Explify.explify,
    print = ExplPrint.p_file ExplEnv.empty
}

val toExplify = transform explify "explify" o toTermination

val corify = {
    func = Corify.corify,
    print = CorePrint.p_file CoreEnv.empty
}

val toCorify = transform corify "corify" o toExplify

(*val reduce_local = {
    func = ReduceLocal.reduce,
    print = CorePrint.p_file CoreEnv.empty
}

val toReduce_local = transform reduce_local "reduce_local" o toCorify*)

val especialize = {
    func = ESpecialize.specialize,
    print = CorePrint.p_file CoreEnv.empty
}

val toEspecialize = transform especialize "especialize" o toCorify

val core_untangle = {
    func = CoreUntangle.untangle,
    print = CorePrint.p_file CoreEnv.empty
}

val toCore_untangle = transform core_untangle "core_untangle" o toEspecialize

val shake = {
    func = Shake.shake,
    print = CorePrint.p_file CoreEnv.empty
}

val toShake1 = transform shake "shake1" o toCore_untangle

val tag = {
    func = Tag.tag,
    print = CorePrint.p_file CoreEnv.empty
}

val toTag = transform tag "tag" o toShake1

val reduce = {
    func = Reduce.reduce,
    print = CorePrint.p_file CoreEnv.empty
}

val toReduce = transform reduce "reduce" o toTag

val unpoly = {
    func = Unpoly.unpoly,
    print = CorePrint.p_file CoreEnv.empty
}

val toUnpoly = transform unpoly "unpoly" o toReduce

val specialize = {
    func = Specialize.specialize,
    print = CorePrint.p_file CoreEnv.empty
}

val toSpecialize = transform specialize "specialize" o toUnpoly

val toShake2 = transform shake "shake2" o toSpecialize

val monoize = {
    func = Monoize.monoize CoreEnv.empty,
    print = MonoPrint.p_file MonoEnv.empty
}

val toMonoize = transform monoize "monoize" o toShake2

val mono_opt = {
    func = MonoOpt.optimize,
    print = MonoPrint.p_file MonoEnv.empty
}

val toMono_opt1 = transform mono_opt "mono_opt1" o toMonoize

val untangle = {
    func = Untangle.untangle,
    print = MonoPrint.p_file MonoEnv.empty
}

val toUntangle = transform untangle "untangle" o toMono_opt1

val mono_reduce = {
    func = MonoReduce.reduce,
    print = MonoPrint.p_file MonoEnv.empty
}

val toMono_reduce = transform mono_reduce "mono_reduce" o toUntangle

val mono_shake = {
    func = MonoShake.shake,
    print = MonoPrint.p_file MonoEnv.empty
}

val toMono_shake = transform mono_shake "mono_shake1" o toMono_reduce

val toMono_opt2 = transform mono_opt "mono_opt2" o toMono_shake

val fuse = {
    func = Fuse.fuse,
    print = MonoPrint.p_file MonoEnv.empty
}

val toFuse = transform fuse "fuse" o toMono_opt2

val toUntangle2 = transform untangle "untangle2" o toFuse

val toMono_shake2 = transform mono_shake "mono_shake2" o toUntangle2

val pathcheck = {
    func = (fn file => (PathCheck.check file; file)),
    print = MonoPrint.p_file MonoEnv.empty
}

val toPathcheck = transform pathcheck "pathcheck" o toMono_shake2

val cjrize = {
    func = Cjrize.cjrize,
    print = CjrPrint.p_file CjrEnv.empty
}

val toCjrize = transform cjrize "cjrize" o toPathcheck

val prepare = {
    func = Prepare.prepare,
    print = CjrPrint.p_file CjrEnv.empty
}

val toPrepare = transform prepare "prepare" o toCjrize

val sqlify = {
    func = Cjrize.cjrize,
    print = CjrPrint.p_sql CjrEnv.empty
}

val toSqlify = transform sqlify "sqlify" o toMono_opt2

fun compileC {cname, oname, ename, libs, profile} =
    let
        val urweb_o = clibFile "urweb.o"
        val driver_o = clibFile "driver.o"

        val compile = "gcc " ^ Config.gccArgs ^ " -Wstrict-prototypes -Werror -O3 -I include -c " ^ cname ^ " -o " ^ oname
        val link = "gcc -Werror -O3 -lm -pthread " ^ libs ^ " " ^ urweb_o ^ " " ^ oname ^ " " ^ driver_o ^ " -o " ^ ename

        val (compile, link) =
            if profile then
                (compile ^ " -pg", link ^ " -pg")
            else
                (compile, link)
    in
        if not (OS.Process.isSuccess (OS.Process.system compile)) then
            print "C compilation failed\n"
        else if not (OS.Process.isSuccess (OS.Process.system link)) then
            print "C linking failed\n"
        else
            print "Success\n"
    end

fun compile job =
    case run toPrepare job of
        NONE => print "Ur compilation failed\n"
      | SOME file =>
        let
            val job = valOf (run (transform parseUrp "parseUrp") job)

            val (cname, oname, cleanup) =
                if #debug job then
                    ("/tmp/webapp.c", "/tmp/webapp.o", fn () => ())
                else
                    let
                        val dir = OS.FileSys.tmpName ()
                        val () = if OS.FileSys.access (dir, []) then
                                     OS.FileSys.remove dir
                                 else
                                     ()
                        val cname = OS.Path.joinDirFile {dir = dir, file = "webapp.c"}
                        val oname = OS.Path.joinDirFile {dir = dir, file = "webapp.o"}
                    in
                        OS.FileSys.mkDir dir;
                        (cname, oname,
                         fn () => (OS.FileSys.remove cname;
                                   OS.FileSys.remove oname;
                                   OS.FileSys.rmDir dir)
                            handle OS.SysErr _ => OS.FileSys.rmDir dir)
                    end
            val ename = #exe job
        in
            let
                val outf = TextIO.openOut cname
                val s = TextIOPP.openOut {dst = outf, wid = 80}

                val hasDb = List.exists (fn (Cjr.DDatabase _, _) => true | _ => false) (#1 file)
                val libs =
                    if hasDb then
                        "-lpq"
                    else
                        ""
            in
                Print.fprint s (CjrPrint.p_file CjrEnv.empty file);
		TextIO.output1 (outf, #"\n");
                TextIO.closeOut outf;

                case #sql job of
                    NONE => ()
                  | SOME sql =>
                    let
                        val outf = TextIO.openOut sql
                        val s = TextIOPP.openOut {dst = outf, wid = 80}
                    in
                        Print.fprint s (CjrPrint.p_sql CjrEnv.empty file);
                        TextIO.closeOut outf
                    end;

                compileC {cname = cname, oname = oname, ename = ename, libs = libs, profile = #profile job};
                
                cleanup ()
            end
            handle ex => (((cleanup ()) handle _ => ()); raise ex)
        end

end