summaryrefslogtreecommitdiff
path: root/src/jscomp.sml
blob: bb457ab3719dd4e84d02bd7e0c296f5977d0eb58 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
(* 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.
 *)

structure JsComp :> JSCOMP = struct

open Mono

structure EM = ErrorMsg
structure E = MonoEnv
structure U = MonoUtil

structure IS = IntBinarySet
structure IM = IntBinaryMap

val funcs = [(("Basis", "alert"), "alert"),
             (("Basis", "htmlifyBool"), "bs"),
             (("Basis", "htmlifyFloat"), "ts"),
             (("Basis", "htmlifyInt"), "ts"),
             (("Basis", "htmlifyString"), "escape"),
             (("Basis", "new_client_source"), "sc"),
             (("Basis", "set_client_source"), "sv")]

structure FM = BinaryMapFn(struct
                           type ord_key = string * string
                           fun compare ((m1, x1), (m2, x2)) =
                               Order.join (String.compare (m1, m2),
                                           fn () => String.compare (x1, x2))
                           end)

val funcs = foldl (fn ((k, v), m) => FM.insert (m, k, v)) FM.empty funcs

fun ffi k = FM.find (funcs, k)

type state = {
     decls : decl list,
     script : string list,
     included : IS.set,
     injectors : int IM.map,
     maxName : int
}

fun varDepth (e, _) =
    case e of
        EPrim _ => 0
      | ERel _ => 0
      | ENamed _ => 0
      | ECon (_, _, NONE) => 0
      | ECon (_, _, SOME e) => varDepth e
      | ENone _ => 0
      | ESome (_, e) => varDepth e
      | EFfi _ => 0
      | EFfiApp (_, _, es) => foldl Int.max 0 (map varDepth es)
      | EApp (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | EAbs _ => 0
      | EUnop (_, e) => varDepth e
      | EBinop (_, e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ERecord xes => foldl Int.max 0 (map (fn (_, e, _) => varDepth e) xes)
      | EField (e, _) => varDepth e
      | ECase (e, pes, _) =>
        foldl Int.max (varDepth e)
        (map (fn (p, e) => E.patBindsN p + varDepth e) pes)
      | EStrcat (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | EError (e, _) => varDepth e
      | EWrite e => varDepth e
      | ESeq (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ELet (_, _, e1, e2) => Int.max (varDepth e1, 1 + varDepth e2)
      | EClosure _ => 0
      | EQuery _ => 0
      | EDml _ => 0
      | ENextval _ => 0
      | EUnurlify _ => 0
      | EJavaScript _ => 0
      | ESignalReturn e => varDepth e
      | ESignalBind (e1, e2) => Int.max (varDepth e1, varDepth e2)
      | ESignalSource e => varDepth e

fun closedUpto d =
    let
        fun cu inner (e, _) =
            case e of
                EPrim _ => true
              | ERel n => n < inner orelse n - inner >= d
              | ENamed _ => true
              | ECon (_, _, NONE) => true
              | ECon (_, _, SOME e) => cu inner e
              | ENone _ => true
              | ESome (_, e) => cu inner e
              | EFfi _ => true
              | EFfiApp (_, _, es) => List.all (cu inner) es
              | EApp (e1, e2) => cu inner e1 andalso cu inner e2
              | EAbs (_, _, _, e) => cu (inner + 1) e
              | EUnop (_, e) => cu inner e
              | EBinop (_, e1, e2) => cu inner e1 andalso cu inner e2
              | ERecord xes => List.all (fn (_, e, _) => cu inner e) xes
              | EField (e, _) => cu inner e
              | ECase (e, pes, _) =>
                cu inner e
                andalso List.all (fn (p, e) => cu (inner + E.patBindsN p) e) pes
              | EStrcat (e1, e2) => cu inner e1 andalso cu inner e2
              | EError (e, _) => cu inner e
              | EWrite e => cu inner e
              | ESeq (e1, e2) => cu inner e1 andalso cu inner e2
              | ELet (_, _, e1, e2) => cu inner e1 andalso cu (inner + 1) e2
              | EClosure (_, es) => List.all (cu inner) es
              | EQuery {query, body, initial, ...} =>
                cu inner query
                andalso cu (inner + 2) body
                andalso cu inner initial
              | EDml e => cu inner e
              | ENextval e => cu inner e
              | EUnurlify (e, _) => cu inner e
              | EJavaScript (_, e, _) => cu inner e
              | ESignalReturn e => cu inner e
              | ESignalBind (e1, e2) => cu inner e1 andalso cu inner e2
              | ESignalSource e => cu inner e
    in
        cu 0
    end

fun strcat loc es =
    case es of
        [] => (EPrim (Prim.String ""), loc)
      | [x] => x
      | x :: es' => (EStrcat (x, strcat loc es'), loc)

fun process file =
    let
        val (someTs, nameds) =
            foldl (fn ((DVal (_, n, t, e, _), _), (someTs, nameds)) => (someTs, IM.insert (nameds, n, e))
                    | ((DValRec vis, _), (someTs, nameds)) =>
                      (someTs, foldl (fn ((_, n, _, e, _), nameds) => IM.insert (nameds, n, e))
                                     nameds vis)
                    | ((DDatatype (_, _, cs), _), state as (someTs, nameds)) =>
                      if ElabUtil.classifyDatatype cs = Option then
                          (foldl (fn ((_, n, SOME t), someTs) => IM.insert (someTs, n, t)
                                   | (_, someTs) => someTs) someTs cs,
                           nameds)
                      else
                          state
                    | (_, state) => state)
                  (IM.empty, IM.empty) file

        fun str loc s = (EPrim (Prim.String s), loc)

        fun isNullable (t, _) =
            case t of
                TOption _ => true
              | TRecord [] => true
              | _ => false

        fun quoteExp loc (t : typ) (e, st) =
            case #1 t of
                TSource => (strcat loc [str loc "s",
                                        (EFfiApp ("Basis", "htmlifyInt", [e]), loc)], st)

              | TRecord [] => (str loc "null", st)
              | TRecord [(x, t)] =>
                let
                    val (e, st) = quoteExp loc t ((EField (e, x), loc), st)
                in
                    (strcat loc [str loc ("{_" ^ x ^ ":"),
                                 e,
                                 str loc "}"], st)
                end
              | TRecord ((x, t) :: xts) =>
                let
                    val (e', st) = quoteExp loc t ((EField (e, x), loc), st)
                    val (es, st) = ListUtil.foldlMap
                                   (fn ((x, t), st) =>
                                       let
                                           val (e, st) = quoteExp loc t ((EField (e, x), loc), st)
                                       in
                                           (strcat loc [str loc (",_" ^ x ^ ":"), e], st)
                                       end)
                                   st xts
                in
                    (strcat loc (str loc ("{_" ^ x ^ ":")
                                 :: e'
                                 :: es
                                 @ [str loc "}"]), st)
                end

              | TFfi ("Basis", "string") => ((EFfiApp ("Basis", "jsifyString", [e]), loc), st)
              | TFfi ("Basis", "int") => ((EFfiApp ("Basis", "htmlifyInt", [e]), loc), st)
              | TFfi ("Basis", "float") => ((EFfiApp ("Basis", "htmlifyFloat", [e]), loc), st)

              | TFfi ("Basis", "bool") => ((ECase (e,
                                                   [((PCon (Enum, PConFfi {mod = "Basis",
                                                                           datatyp = "bool",
                                                                           con = "True",
                                                                           arg = NONE}, NONE), loc),
                                                     str loc "true"),
                                                    ((PCon (Enum, PConFfi {mod = "Basis",
                                                                           datatyp = "bool",
                                                                           con = "False",
                                                                           arg = NONE}, NONE), loc),
                                                     str loc "false")],
                                                   {disc = (TFfi ("Basis", "bool"), loc),
                                                    result = (TFfi ("Basis", "string"), loc)}), loc),
                                           st)

              | TOption t =>
                let
                    val (e', st) = quoteExp loc t ((ERel 0, loc), st)
                in
                    ((ECase (e,
                             [((PNone t, loc),
                               str loc "null"),
                              ((PSome (t, (PVar ("x", t), loc)), loc),
                               if isNullable t then
                                   strcat loc [str loc "{v:", e', str loc "}"]
                               else
                                   e')],
                             {disc = (TOption t, loc),
                              result = (TFfi ("Basis", "string"), loc)}), loc),
                     st)
                end

              | TDatatype (n, ref (dk, cs)) =>
                (case IM.find (#injectors st, n) of
                     SOME n' => ((EApp ((ENamed n', loc), e), loc), st)
                   | NONE =>
                     let
                         val dk = ElabUtil.classifyDatatype cs

                         val n' = #maxName st
                         val st = {decls = #decls st,
                                   script = #script st,
                                   included = #included st,
                                   injectors = IM.insert (#injectors st, n, n'),
                                   maxName = n' + 1}

                         val (pes, st) = ListUtil.foldlMap
                                             (fn ((_, cn, NONE), st) =>
                                                 (((PCon (dk, PConVar cn, NONE), loc),
                                                   case dk of
                                                       Option => str loc "null"
                                                     | _ => str loc (Int.toString cn)),
                                                  st)
                                               | ((_, cn, SOME t), st) =>
                                                 let
                                                     val (e, st) = quoteExp loc t ((ERel 0, loc), st)
                                                 in
                                                     (((PCon (dk, PConVar cn, SOME (PVar ("x", t), loc)), loc),
                                                       case dk of
                                                           Option =>
                                                           if isNullable t then
                                                               strcat loc [str loc "{_v:",
                                                                           e,
                                                                           str loc "}"]
                                                           else
                                                               e
                                                         | _ => e),
                                                      st)
                                                 end)
                                             st cs

                         val s = (TFfi ("Basis", "string"), loc)
                         val body = (ECase ((ERel 0, loc), pes,
                                            {disc = t, result = s}), loc)
                         val body = (EAbs ("x", t, s, body), loc)

                         val st = {decls = (DValRec [("jsify", n', (TFun (t, s), loc),
                                                      body, "jsify")], loc) :: #decls st,
                                   script = #script st,
                                   included = #included st,
                                   injectors = #injectors st,
                                   maxName = #maxName st}
                     in
                         ((EApp ((ENamed n', loc), e), loc), st)
                     end)

              | _ => (EM.errorAt loc "Don't know how to embed type in JavaScript";
                      Print.prefaces "Can't embed" [("t", MonoPrint.p_typ MonoEnv.empty t)];
                      (str loc "ERROR", st))

        fun jsExp mode skip outer =
            let
                val len = length outer

                fun jsE inner (e as (_, loc), st) =
                    let
                        val str = str loc

                        fun var n = Int.toString (len + inner - n - 1)

                        fun patCon pc =
                            case pc of
                                PConVar n => str (Int.toString n)
                              | PConFfi {mod = "Basis", con = "True", ...} => str "true"
                              | PConFfi {mod = "Basis", con = "False", ...} => str "false"
                              | PConFfi {con, ...} => str ("\"_" ^ con ^ "\"")

                        fun unsupported s =
                            (EM.errorAt loc (s ^ " in code to be compiled to JavaScript[2]");
                             (str "ERROR", st))

                        val strcat = strcat loc

                        fun jsPrim p =
                            case p of
                                Prim.String s =>
                                str ("\""
                                     ^ String.translate (fn #"'" =>
                                                            if mode = Attribute then
                                                                "\\047"
                                                            else
                                                                "'"
                                                          | #"\"" => "\\\""
                                                          | #"<" =>
                                                            if mode = Script then
                                                                "<"
                                                            else
                                                                "\\074"
                                                          | #"\\" => "\\\\"
                                                          | ch => String.str ch) s
                                     ^ "\"")
                              | _ => str (Prim.toString p)

                        fun jsPat depth inner (p, _) succ fail =
                            case p of
                                PWild => succ
                              | PVar _ => strcat [str ("(_" ^ Int.toString (len + inner) ^ "=d"
                                                       ^ Int.toString depth ^ ","),
                                                  succ,
                                                  str ")"]
                              | PPrim p => strcat [str ("(d" ^ Int.toString depth ^ "=="),
                                                   jsPrim p,
                                                   str "?",
                                                   succ,
                                                   str ":",
                                                   fail,
                                                   str ")"]
                              | PCon (_, PConFfi {mod = "Basis", con = "True", ...}, NONE) =>
                                strcat [str ("(d" ^ Int.toString depth ^ "?"),
                                        succ,
                                        str ":",
                                        fail,
                                        str ")"]
                              | PCon (_, PConFfi {mod = "Basis", con = "False", ...}, NONE) =>
                                strcat [str ("(d" ^ Int.toString depth ^ "?"),
                                        fail,
                                        str ":",
                                        succ,
                                        str ")"]
                              | PCon (Option, _, NONE) =>
                                strcat [str ("(d" ^ Int.toString depth ^ "?"),
                                        fail,
                                        str ":",
                                        succ,
                                        str ")"]
                              | PCon (Option, PConVar n, SOME p) =>
                                (case IM.find (someTs, n) of
                                     NONE => raise Fail "Jscomp: Not in someTs"
                                   | SOME t =>
                                     strcat [str ("(d" ^ Int.toString depth ^ "?("
                                                  ^ (if isNullable t then
                                                         "d" ^ Int.toString depth ^ "=d"
                                                         ^ Int.toString depth ^ ".v,"
                                                     else
                                                         "")),
                                             jsPat depth inner p succ fail,
                                             str "):",
                                             fail,
                                             str ")"])
                              | PCon (_, pc, NONE) =>
                                strcat [str ("(d" ^ Int.toString depth ^ "=="),
                                        patCon pc,
                                        str "?",
                                        succ,
                                        str ":",
                                        fail,
                                        str ")"]
                              | PCon (_, pc, SOME p) =>
                                strcat [str ("(d" ^ Int.toString depth ^ ".n=="),
                                        patCon pc,
                                        str ("?(d" ^ Int.toString depth ^ "=d" ^ Int.toString depth ^ ".v,"),
                                        jsPat depth inner p succ fail,
                                        str "):",
                                        fail,
                                        str ")"]
                              | PRecord xps =>
                                let
                                    val (_, succ) = foldl
                                                        (fn ((x, p, _), (inner, succ)) =>
                                                            (inner + E.patBindsN p,
                                                             strcat [str ("(d" ^ Int.toString (depth+1) ^ "=d"
                                                                          ^ Int.toString depth ^ "._" ^ x ^ ","),
                                                                     jsPat (depth+1) inner p succ fail,
                                                                     str ")"]))
                                                        (inner, succ) xps
                                in
                                    succ
                                end
                              | PNone _ => strcat [str ("(d" ^ Int.toString depth ^ "?"),
                                                   fail,
                                                   str ":",
                                                   succ,
                                                   str ")"]
                              | PSome (t, p) => strcat (str ("(d" ^ Int.toString depth ^ "?")
                                                        :: (if isNullable t then
                                                                [str ("d" ^ Int.toString depth
                                                                      ^ "=d" ^ Int.toString depth ^ ".v")]
                                                            else
                                                                [])
                                                        @ [jsPat depth inner p succ fail,
                                                           str ":",
                                                           fail,
                                                           str ")"])

                        fun deStrcat (e, _) =
                            case e of
                                EPrim (Prim.String s) => s
                              | EStrcat (e1, e2) => deStrcat e1 ^ deStrcat e2
                              | _ => raise Fail "Jscomp: deStrcat"

                        val quoteExp = quoteExp loc
                    in
                        (*Print.prefaces "jsE" [("e", MonoPrint.p_exp MonoEnv.empty e)];*)

                        case #1 e of
                            EPrim p => (jsPrim p, st)
                          | ERel n =>
                            if n < inner then
                                (str ("_" ^ var n), st)
                            else
                                let
                                    val n = n - inner
                                in
                                    quoteExp (List.nth (outer, n)) ((ERel (n - skip), loc), st)
                                end

                          | ENamed n =>
                            let
                                val st =
                                    if IS.member (#included st, n) then
                                        st
                                    else
                                        case IM.find (nameds, n) of
                                            NONE => raise Fail "Jscomp: Unbound ENamed"
                                          | SOME e =>
                                            let
                                                val st = {decls = #decls st,
                                                          script = #script st,
                                                          included = IS.add (#included st, n),
                                                          injectors = #injectors st,
                                                          maxName = #maxName st}

                                                val (e, st) = jsExp mode skip [] 0 (e, st)
                                                val e = deStrcat e
                                                
                                                val sc = "_n" ^ Int.toString n ^ "=" ^ e ^ ";\n"
                                            in
                                                {decls = #decls st,
                                                 script = sc :: #script st,
                                                 included = #included st,
                                                 injectors = #injectors st,
                                                 maxName = #maxName st}
                                            end
                            in
                                (str ("_n" ^ Int.toString n), st)
                            end

                          | ECon (Option, _, NONE) => (str "null", st)
                          | ECon (Option, PConVar n, SOME e) =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                case IM.find (someTs, n) of
                                    NONE => raise Fail "Jscomp: Not in someTs [2]"
                                  | SOME t =>
                                    (if isNullable t then
                                         strcat [str "{v:",
                                                 e,
                                                 str "}"]
                                     else
                                         e, st)
                            end

                          | ECon (_, pc, NONE) => (patCon pc, st)
                          | ECon (_, pc, SOME e) =>
                            let
                                val (s, st) = jsE inner (e, st)
                            in
                                (strcat [str "{n:",
                                         patCon pc,
                                         str ",v:",
                                         s,
                                         str "}"], st)
                            end

                          | ENone _ => (str "null", st)
                          | ESome (t, e) =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (if isNullable t then
                                     strcat [str "{v:", e, str "}"]
                                 else
                                     e, st)
                            end

                          | EFfi k =>
                            let
                                val name = case ffi k of
                                               NONE => (EM.errorAt loc ("Unsupported FFI identifier " ^ #2 k
                                                                        ^ " in JavaScript");
                                                        "ERROR")
                                             | SOME s => s
                            in
                                (str name, st)
                            end
                          | EFfiApp (m, x, args) =>
                            let
                                val args =
                                    case (m, x, args) of
                                        ("Basis", "new_client_source", [(EJavaScript (_, e, _), _)]) => [e]
                                      | ("Basis", "set_client_source", [e1, (EJavaScript (_, e2, _), _)]) => [e1, e2]
                                      | _ => args

                                val name = case ffi (m, x) of
                                               NONE => (EM.errorAt loc ("Unsupported FFI function "
                                                                        ^ x ^ " in JavaScript");
                                                        "ERROR")
                                             | SOME s => s
                            in
                                case args of
                                    [] => (str (name ^ "()"), st)
                                  | [e] =>
                                    let
                                        val (e, st) = jsE inner (e, st)
                                    in
                                        (strcat [str (name ^ "("),
                                                 e,
                                                 str ")"], st)
                                    end
                                  | e :: es =>
                                    let
                                        val (e, st) = jsE inner (e, st)
                                        val (es, st) = ListUtil.foldlMapConcat
                                                           (fn (e, st) =>
                                                               let
                                                                   val (e, st) = jsE inner (e, st)
                                                               in
                                                                   ([str ",", e], st)
                                                               end)
                                                           st es
                                    in
                                        (strcat (str (name ^ "(")
                                                 :: e
                                                 :: es
                                                 @ [str ")"]), st)
                                    end
                            end

                          | EApp (e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE inner (e2, st)
                            in
                                (strcat [e1, str "(", e2, str ")"], st)
                            end
                          | EAbs (_, _, _, e) =>
                            let
                                val locals = List.tabulate
                                                 (varDepth e,
                                               fn i => str ("var _" ^ Int.toString (len + inner + i + 1) ^ ";"))
                                val (e, st) = jsE (inner + 1) (e, st)
                            in
                                (strcat (str ("function(_"
                                              ^ Int.toString (len + inner)
                                              ^ "){")
                                         :: locals
                                         @ [str "return ",
                                            e,
                                            str "}"]),
                                 st)
                            end

                          | EUnop (s, e) =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str ("(" ^ s),
                                         e,
                                         str ")"],
                                 st)
                            end
                          | EBinop (s, e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE inner (e2, st)
                            in
                                (strcat [str "(",
                                         e1,
                                         str s,
                                         e2,
                                         str ")"],
                                 st)
                            end

                          | ERecord [] => (str "null", st)
                          | ERecord [(x, e, _)] =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str "{_x:", e, str "}"], st)
                            end
                          | ERecord ((x, e, _) :: xes) =>
                            let
                                val (e, st) = jsE inner (e, st)

                                val (es, st) =
                                    foldr (fn ((x, e, _), (es, st)) =>
                                              let
                                                  val (e, st) = jsE inner (e, st)
                                              in
                                                  (str (",_" ^ x ^ ":")
                                                   :: e
                                                   :: es,
                                                   st)
                                              end)
                                          ([str "}"], st) xes
                            in
                                (strcat (str ("{_" ^ x ^ ":")
                                         :: e
                                         :: es),
                                 st)
                            end
                          | EField (e, x) =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [e,
                                         str ("._" ^ x)], st)
                            end

                          | ECase (e', pes, {result, ...}) =>
                            if closedUpto inner e andalso List.all (fn (_, e) => closedUpto inner e) pes then
                                let
                                    val (e', st) = quoteExp result ((ERel 0, loc), st)
                                in
                                    ((ELet ("js", result, e, e'), loc),
                                     st)
                                end
                            else
                                let
                                    val plen = length pes

                                    val (cases, st) = ListUtil.foldliMap
                                                          (fn (i, (p, e), st) =>
                                                              let
                                                                  val (e, st) = jsE (inner + E.patBindsN p) (e, st)
                                                                  val fail =
                                                                      if i = plen - 1 then
                                                                          str "pf()"
                                                                      else
                                                                          str ("c" ^ Int.toString (i+1) ^ "()")
                                                                  val c = jsPat 0 inner p e fail
                                                              in
                                                                  (strcat [str ("c" ^ Int.toString i ^ "=function(){return "),
                                                                           c,
                                                                           str "},"],
                                                                   st)
                                                              end)
                                                          st pes

                                    val (e, st) = jsE inner (e', st)
                                in
                                    (strcat (str "("
                                             :: List.revAppend (cases,
                                                                [str "d0=",
                                                                 e,
                                                                 str ",c0())"])), st)
                                end

                          | EStrcat (e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE inner (e2, st)
                            in
                                (strcat [str "(", e1, str "+", e2, str ")"], st)
                            end

                          | EError (e, _) =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str "alert(\"ERROR: \"+", e, str ")"],
                                 st)
                            end

                          | EWrite e =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str "document.write(",
                                         e,
                                         str ".v)"], st)
                            end

                          | ESeq (e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE inner (e2, st)
                            in
                                (strcat [str "(", e1, str ",", e2, str ")"], st)
                            end
                          | ELet (_, _, e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE (inner + 1) (e2, st)
                            in
                                (strcat [str ("(_" ^ Int.toString (len + inner) ^ "="),
                                         e1,
                                         str ",",
                                         e2,
                                         str ")"], st)
                            end

                          | EJavaScript (_, _, SOME _) => (e, st)

                          | EClosure _ => unsupported "EClosure"
                          | EQuery _ => unsupported "Query"
                          | EDml _ => unsupported "DML"
                          | ENextval _ => unsupported "Nextval"
                          | EUnurlify _ => unsupported "EUnurlify"
                          | EJavaScript (_, e, _) => unsupported "Nested JavaScript"

                          | ESignalReturn e =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str "sr(",
                                         e,
                                         str ")"],
                                 st)
                            end
                          | ESignalBind (e1, e2) =>
                            let
                                val (e1, st) = jsE inner (e1, st)
                                val (e2, st) = jsE inner (e2, st)
                            in
                                (strcat [str "sb(",
                                         e1,
                                         str ",",
                                         e2,
                                         str ")"],
                                 st)
                            end
                          | ESignalSource e =>
                            let
                                val (e, st) = jsE inner (e, st)
                            in
                                (strcat [str "ss(",
                                         e,
                                         str ")"],
                                 st)
                            end
                    end
            in
                jsE
            end

        val decl : state -> decl -> decl * state =
            U.Decl.foldMapB {typ = fn x => x,
                             exp = fn (env, e, st) =>
                                      let
                                          fun doCode m skip env orig e =
                                              let
                                                  val len = length env
                                                  fun str s = (EPrim (Prim.String s), #2 e)

                                                  val locals = List.tabulate
                                                                   (varDepth e,
                                                                 fn i => str ("var _" ^ Int.toString (len + i) ^ ";"))
                                                  val (e, st) = jsExp m skip env 0 (e, st)
                                              in
                                                  (EJavaScript (m, orig, SOME (strcat (#2 e) (locals @ [e]))), st)
                                              end
                                      in
                                          case e of
                                              EJavaScript (m, orig as (EAbs (_, t, _, e), _), NONE) =>
                                              doCode m 1 (t :: env) orig e
                                            | EJavaScript (m, orig, NONE) =>
                                              doCode m 0 env orig orig
                                            | _ => (e, st)
                                      end,
                             decl = fn (_, e, st) => (e, st),
                             bind = fn (env, U.Decl.RelE (_, t)) => t :: env
                                     | (env, _) => env}
                            []

        fun doDecl (d, st) =
            let
                val (d, st) = decl st d
            in
                (List.revAppend (#decls st, [d]),
                 {decls = [],
                  script = #script st,
                  included = #included st,
                  injectors = #injectors st,
                  maxName = #maxName st})
            end

        val (ds, st) = ListUtil.foldlMapConcat doDecl
                       {decls = [],
                        script = [],
                        included = IS.empty,
                        injectors = IM.empty,
                        maxName = U.File.maxName file + 1}
                       file

        val inf = TextIO.openIn (OS.Path.joinDirFile {dir = Config.libJs, file = "urweb.js"})
        fun lines acc =
            case TextIO.inputLine inf of
                NONE => String.concat (rev acc)
              | SOME line => lines (line :: acc)
        val lines = lines []
    in
        TextIO.closeIn inf;
        (DJavaScript (lines ^ String.concat (rev (#script st))), ErrorMsg.dummySpan) :: ds
    end

end