More Apache directory option stuff
[hcoop/domtool2.git] / src / main.sml
index bbf1091..705b20a 100644 (file)
@@ -22,79 +22,115 @@ structure Main :> MAIN = struct
 
 open Ast Print
 
+structure SM = StringMap
+
 val dmy = ErrorMsg.dummyLoc
 
-val tInit = (TAction ((CRoot, dmy),
-                     StringMap.empty,
-                     StringMap.empty),
-            dmy)
+val defaultT : record ref = ref SM.empty
+val defaultV : (unit -> exp) SM.map ref = ref SM.empty
+
+fun registerDefault (name, t, v) =
+    case SM.find (!defaultT, name) of
+       NONE => (defaultT := SM.insert (!defaultT, name, t);
+                defaultV := SM.insert (!defaultV, name, v))
+      | SOME _ => raise Fail "Duplicate default environment variable"
+
+fun tInit () = (TAction ((CRoot, dmy),
+                        !defaultT,
+                        StringMap.empty),
+               dmy)
+
+
            
-fun check fname =
+fun check' G fname =
     let
+       (*val _ = print ("Check " ^ fname ^ "\n")*)
        val prog = Parse.parse fname
     in
        if !ErrorMsg.anyErrors then
-           ()
+           G
        else
-           let
-               val G' = Tycheck.checkFile Env.empty tInit prog
-           in
-               ()
-           end
+           Tycheck.checkFile G (tInit ()) prog
     end
 
-fun reduce fname =
+fun basis () =
     let
-       val prog = Parse.parse fname
+       val dir = Posix.FileSys.opendir Config.libRoot
+
+       fun loop files =
+           case Posix.FileSys.readdir dir of
+               NONE => (Posix.FileSys.closedir dir;
+                        files)
+             | SOME fname =>
+               if String.isSuffix ".dtl" fname then
+                   loop (OS.Path.joinDirFile {dir = Config.libRoot,
+                                              file = fname}
+                         :: files)
+               else
+                   loop files
+
+       val files = loop []
+       val files = Order.order files
     in
        if !ErrorMsg.anyErrors then
-           ()
+           Env.empty
        else
-           let
-               val G' = Tycheck.checkFile Env.empty tInit prog
-           in
-               if !ErrorMsg.anyErrors then
-                   ()
-               else
-                   case prog of
-                       (_, SOME body) =>
-                       let
-                           val body' = Reduce.reduceExp G' body
-                       in
-                           printd (PD.hovBox (PD.PPS.Rel 0,
-                                              [PD.string "Result:",
-                                               PD.space 1,
-                                               p_exp body']))
-                       end
-                     | _ => ()
-           end
+           foldl (fn (fname, G) => check' G fname) Env.empty files
     end
 
-fun eval fname =
+fun check fname =
     let
-       val prog = Parse.parse fname
+       val _ = ErrorMsg.reset ()
+       val _ = Env.preTycheck ()
+
+       val b = basis ()
     in
        if !ErrorMsg.anyErrors then
-           ()
+           (b, NONE)
        else
            let
-               val G' = Tycheck.checkFile Env.empty tInit prog
+               val _ = ErrorMsg.reset ()
+               val prog = Parse.parse fname
            in
                if !ErrorMsg.anyErrors then
-                   ()
+                   (Env.empty, NONE)
                else
-                   case prog of
-                       (_, SOME body) =>
-                       let
-                           val body' = Reduce.reduceExp G' body
-                       in
-                           if !ErrorMsg.anyErrors then
-                               ()
-                           else
-                               Eval.exec StringMap.empty body'
-                       end
-                     | _ => ()
+                   let
+                       val G' = Tycheck.checkFile b (tInit ()) prog
+                   in
+                       (G', #3 prog)
+                   end
            end
     end
 
+fun reduce fname =
+    let
+       val (G, body) = check fname
+    in
+       if !ErrorMsg.anyErrors then
+           NONE
+       else
+           case body of
+               SOME body =>
+               let
+                   val body' = Reduce.reduceExp G body
+               in
+                   (*printd (PD.hovBox (PD.PPS.Rel 0,
+                                        [PD.string "Result:",
+                                         PD.space 1,
+                                         p_exp body']))*)
+                   SOME body'
+               end
+             | _ => NONE
+    end
+
+fun eval fname =
+    case reduce fname of
+       (SOME body') =>
+       if !ErrorMsg.anyErrors then
+           ()
+       else
+           Eval.exec (SM.map (fn f => f ()) (!defaultV)) body'
+      | NONE => ()
+
 end