summaryrefslogtreecommitdiff
path: root/src/urweb.grm
blob: 8d5f8bb7567146fab5d759f41e3959b54ad1f747 (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
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
(* 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 SOFTARE 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.
 *)

(* Grammar for Ur/Web programs *)

open Source

val s = ErrorMsg.spanOf
val dummy = ErrorMsg.dummySpan

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

fun entable t =
    case #1 t of
        TRecord c => c
      | _ => t

datatype select_item =
         Field of con * con
       | Exp of con * exp
       | Fields of con * con

datatype select =
         Star
       | Items of select_item list

datatype group_item =
         GField of con * con

fun eqTnames ((c1, _), (c2, _)) =
    case (c1, c2) of
        (CVar (ms1, x1), CVar (ms2, x2)) => ms1 = ms2 andalso x1 = x2
      | (CName x1, CName x2) => x1 = x2
      | _ => false

fun amend_select loc (si, (tabs, exps)) =
    case si of
        Field (tx, fx) =>
        let
            val c = (CRecord ([(fx, (CWild (KType, loc), loc))]), loc)

            val (tabs, found) = ListUtil.foldlMap (fn ((tx', c'), found) =>
                                                      if eqTnames (tx, tx') then
                                                          ((tx', (CConcat (c, c'), loc)), true)
                                                      else
                                                          ((tx', c'), found))
                                                  false tabs
        in
            if found then
                ()
            else
                ErrorMsg.errorAt loc "Select of field from unbound table";
            
            (tabs, exps)
        end
      | Fields (tx, fs) =>
        let
            val (tabs, found) = ListUtil.foldlMap (fn ((tx', c'), found) =>
                                                      if eqTnames (tx, tx') then
                                                          ((tx', (CConcat (fs, c'), loc)), true)
                                                      else
                                                          ((tx', c'), found))
                                                  false tabs
        in
            if found then
                ()
            else
                ErrorMsg.errorAt loc "Select of field from unbound table";
            
            (tabs, exps)
        end
      | Exp (c, e) => (tabs, (c, e) :: exps)

fun amend_group loc (gi, tabs) =
    let
        val (tx, c) = case gi of
                          GField (tx, fx) => (tx, (CRecord ([(fx, (CWild (KType, loc), loc))]), loc))

        val (tabs, found) = ListUtil.foldlMap (fn ((tx', c'), found) =>
                                                  if eqTnames (tx, tx') then
                                                      ((tx', (CConcat (c, c'), loc)), true)
                                                  else
                                                      ((tx', c'), found))
                            false tabs
    in
        if found then
            ()
        else
            ErrorMsg.errorAt loc "Select of field from unbound table";

        tabs
    end

fun sql_inject (v, t, loc) =
    let
        val e = (EApp ((EVar (["Basis"], "sql_inject"), loc), (t, loc)), loc)
    in
        (EApp (e, (v, loc)), loc)
    end

fun sql_compare (oper, sqlexp1, sqlexp2, loc) =
    let
        val e = (EVar (["Basis"], "sql_comparison"), loc)
        val e = (EApp (e, (EVar (["Basis"], "sql_" ^ oper), loc)), loc)
        val e = (EApp (e, sqlexp1), loc)
    in
        (EApp (e, sqlexp2), loc)
    end

fun sql_binary (oper, sqlexp1, sqlexp2, loc) =
    let
        val e = (EVar (["Basis"], "sql_binary"), loc)
        val e = (EApp (e, (EVar (["Basis"], "sql_" ^ oper), loc)), loc)
        val e = (EApp (e, sqlexp1), loc)
    in
        (EApp (e, sqlexp2), loc)
    end

fun sql_unary (oper, sqlexp, loc) =
    let
        val e = (EVar (["Basis"], "sql_unary"), loc)
        val e = (EApp (e, (EVar (["Basis"], "sql_" ^ oper), loc)), loc)
    in
        (EApp (e, sqlexp), loc)
    end

fun sql_relop (oper, sqlexp1, sqlexp2, loc) =
    let
        val e = (EVar (["Basis"], "sql_relop"), loc)
        val e = (EApp (e, (EVar (["Basis"], "sql_" ^ oper), loc)), loc)
        val e = (EApp (e, sqlexp1), loc)
    in
        (EApp (e, sqlexp2), loc)
    end

fun native_op (oper, e1, e2, loc) =
    let
        val e = (EVar (["Basis"], oper), loc)
        val e = (EApp (e, (EWild, loc)), loc)
        val e = (EApp (e, e1), loc)
    in
        (EApp (e, e2), loc)
    end

val inDml = ref false

fun tagIn bt =
    case bt of
        "table" => "tabl"
      | _ => bt

%%
%header (functor UrwebLrValsFn(structure Token : TOKEN))

%term 
   EOF
 | STRING of string | INT of Int64.int | FLOAT of Real64.real
 | SYMBOL of string | CSYMBOL of string
 | LPAREN | RPAREN | LBRACK | RBRACK | LBRACE | RBRACE
 | EQ | COMMA | COLON | DCOLON | TCOLON | DOT | HASH | UNDER | UNDERUNDER | BAR
 | DIVIDE | DOTDOTDOT
 | CON | LTYPE | VAL | REC | AND | FUN | FOLD | UNIT | KUNIT | CLASS
 | DATATYPE | OF
 | TYPE | NAME
 | ARROW | LARROW | DARROW | STAR | SEMI
 | FN | PLUSPLUS | MINUSMINUS | DOLLAR | TWIDDLE
 | STRUCTURE | SIGNATURE | STRUCT | SIG | END | FUNCTOR | WHERE | EXTERN | WITH | SQL
 | INCLUDE | OPEN | CONSTRAINT | CONSTRAINTS | EXPORT | TABLE | SEQUENCE
 | CASE | IF | THEN | ELSE

 | XML_BEGIN of string | XML_END | XML_BEGIN_END of string
 | NOTAGS of string 
 | BEGIN_TAG of string | END_TAG of string

 | SELECT | FROM | AS | CWHERE | GROUP | ORDER | BY | HAVING
 | UNION | INTERSECT | EXCEPT
 | LIMIT | OFFSET | ALL
 | TRUE | FALSE | CAND | OR | NOT
 | COUNT | AVG | SUM | MIN | MAX
 | ASC | DESC
 | INSERT | INTO | VALUES | UPDATE | SET | DELETE
 | NE | LT | LE | GT | GE

%nonterm
   file of decl list
 | decls of decl list
 | decl of decl list
 | vali of string * con option * exp
 | valis of (string * con option * exp) list
 | copt of con option

 | dargs of string list
 | barOpt of unit
 | dcons of (string * con option) list
 | dcon of string * con option

 | sgn of sgn
 | sgntm of sgn
 | sgi of sgn_item
 | sgis of sgn_item list

 | str of str

 | kind of kind
 | ktuple of kind list
 | kcolon of explicitness
 | kopt of kind option

 | path of string list * string
 | cpath of string list * string
 | spath of str
 | mpath of string list

 | cexp of con
 | capps of con
 | cterm of con
 | ctuple of con list
 | ctuplev of con list
 | ident of con
 | idents of con list
 | rcon of (con * con) list
 | rconn of (con * con) list
 | rcone of (con * con) list
 | cargs of con * kind -> con * kind
 | cargl of con * kind -> con * kind
 | cargl2 of con * kind -> con * kind
 | carg of con * kind -> con * kind
 | cargp of con * kind -> con * kind

 | eexp of exp
 | eapps of exp
 | eterm of exp
 | etuple of exp list
 | rexp of (con * exp) list
 | xml of exp
 | xmlOne of exp
 | tag of string * exp
 | tagHead of string * exp

 | earg of exp * con -> exp * con
 | eargp of exp * con -> exp * con
 | eargs of exp * con -> exp * con
 | eargl of exp * con -> exp * con
 | eargl2 of exp * con -> exp * con

 | branch of pat * exp
 | branchs of (pat * exp) list
 | pat of pat
 | pterm of pat
 | rpat of (string * pat) list * bool
 | ptuple of pat list

 | attrs of (con * exp) list
 | attr of con * exp
 | attrv of exp

 | query of exp
 | query1 of exp
 | tables of (con * exp) list
 | tname of con
 | table of con * exp
 | tident of con
 | fident of con
 | seli of select_item
 | selis of select_item list
 | select of select
 | sqlexp of exp
 | wopt of exp
 | groupi of group_item
 | groupis of group_item list
 | gopt of group_item list option
 | hopt of exp
 | obopt of exp
 | obitem of exp * exp
 | obexps of exp
 | diropt of exp
 | lopt of exp
 | ofopt of exp
 | sqlint of exp
 | sqlagg of string

 | texp of exp
 | fields of con list
 | sqlexps of exp list
 | fsets of (con * exp) list
 | enterDml of unit
 | leaveDml of unit


%verbose                                (* print summary of errors *)
%pos int                                (* positions *)
%start file
%pure
%eop EOF
%noshift EOF

%name Urweb

%right SEMI
%nonassoc LARROW
%nonassoc IF THEN ELSE
%nonassoc DARROW
%nonassoc COLON
%nonassoc DCOLON TCOLON
%left UNION INTERSECT EXCEPT
%right COMMA
%right OR
%right CAND
%nonassoc EQ NE LT LE GT GE
%right ARROW
%left WITH
%right PLUSPLUS MINUSMINUS
%right STAR
%left NOT
%nonassoc TWIDDLE
%nonassoc DOLLAR
%left DOT
%nonassoc LBRACE RBRACE

%%

file   : decls                          (decls)
       | SIG sgis                       ([(DSgn ("?", (SgnConst sgis, s (SIGleft, sgisright))),
                                           s (SIGleft, sgisright))])

decls  :                                ([])
       | decl decls                     (decl @ decls)

decl   : CON SYMBOL cargl2 kopt EQ cexp (let
                                             val loc = s (CONleft, cexpright)

                                             val k = Option.getOpt (kopt, (KWild, loc))
                                             val (c, k) = cargl2 (cexp, k)
                                         in
                                             [(DCon (SYMBOL, SOME k, c), loc)]
                                         end)
       | LTYPE SYMBOL EQ cexp           ([(DCon (SYMBOL, SOME (KType, s (LTYPEleft, cexpright)), cexp),
                                           s (LTYPEleft, cexpright))])
       | DATATYPE SYMBOL dargs EQ barOpt dcons([(DDatatype (SYMBOL, dargs, dcons), s (DATATYPEleft, dconsright))])
       | DATATYPE SYMBOL dargs EQ DATATYPE CSYMBOL DOT path
                (case dargs of
                     [] => [(DDatatypeImp (SYMBOL, CSYMBOL :: #1 path, #2 path), s (DATATYPEleft, pathright))]
                   | _ => raise Fail "Arguments specified for imported datatype")
       | VAL vali                       ([(DVal vali, s (VALleft, valiright))])
       | VAL REC valis                  ([(DValRec valis, s (VALleft, valisright))])
       | FUN valis                      ([(DValRec valis, s (FUNleft, valisright))])

       | SIGNATURE CSYMBOL EQ sgn       ([(DSgn (CSYMBOL, sgn), s (SIGNATUREleft, sgnright))])
       | STRUCTURE CSYMBOL EQ str       ([(DStr (CSYMBOL, NONE, str), s (STRUCTUREleft, strright))])
       | STRUCTURE CSYMBOL COLON sgn EQ str ([(DStr (CSYMBOL, SOME sgn, str), s (STRUCTUREleft, strright))])
       | FUNCTOR CSYMBOL LPAREN CSYMBOL COLON sgn RPAREN EQ str
                                        ([(DStr (CSYMBOL1, NONE,
                                                 (StrFun (CSYMBOL2, sgn1, NONE, str), s (FUNCTORleft, strright))),
                                           s (FUNCTORleft, strright))])
       | FUNCTOR CSYMBOL LPAREN CSYMBOL COLON sgn RPAREN COLON sgn EQ str
                                        ([(DStr (CSYMBOL1, NONE,
                                                 (StrFun (CSYMBOL2, sgn1, SOME sgn2, str), s (FUNCTORleft, strright))),
                                           s (FUNCTORleft, strright))])
       | EXTERN STRUCTURE CSYMBOL COLON sgn ([(DFfiStr (CSYMBOL, sgn), s (EXTERNleft, sgnright))])
       | OPEN mpath                     (case mpath of
                                             [] => raise Fail "Impossible mpath parse [1]"
                                           | m :: ms => [(DOpen (m, ms), s (OPENleft, mpathright))])
       | OPEN mpath LPAREN str RPAREN   (let
                                             val loc = s (OPENleft, RPARENright)

                                             val m = case mpath of
                                                         [] => raise Fail "Impossible mpath parse [4]"
                                                       | m :: ms =>
                                                         foldl (fn (m, str) => (StrProj (str, m), loc))
                                                         (StrVar m, loc) ms
                                         in
                                             [(DStr ("anon", NONE, (StrApp (m, str), loc)), loc),
                                              (DOpen ("anon", []), loc)]
                                         end)
       | OPEN CONSTRAINTS mpath         (case mpath of
                                             [] => raise Fail "Impossible mpath parse [3]"
                                           | m :: ms => [(DOpenConstraints (m, ms), s (OPENleft, mpathright))])
       | CONSTRAINT cterm TWIDDLE cterm ([(DConstraint (cterm1, cterm2), s (CONSTRAINTleft, ctermright))])
       | EXPORT spath                   ([(DExport spath, s (EXPORTleft, spathright))])
       | TABLE SYMBOL COLON cexp        ([(DTable (SYMBOL, entable cexp), s (TABLEleft, cexpright))])
       | SEQUENCE SYMBOL                ([(DSequence SYMBOL, s (SEQUENCEleft, SYMBOLright))])
       | CLASS SYMBOL EQ cexp           ([(DClass (SYMBOL, cexp), s (CLASSleft, cexpright))])
       | CLASS SYMBOL SYMBOL EQ cexp    (let
                                             val loc = s (CLASSleft, cexpright)
                                             val k = (KType, loc)
                                             val c = (CAbs (SYMBOL2, SOME k, cexp), loc)
                                         in
                                             [(DClass (SYMBOL1, c), s (CLASSleft, cexpright))]
                                         end)

kopt   :                                (NONE)
       | DCOLON kind                    (SOME kind)

dargs  :                                ([])
       | SYMBOL dargs                   (SYMBOL :: dargs)

barOpt :                                ()
       | BAR                            ()

dcons  : dcon                           ([dcon])
       | dcon BAR dcons                 (dcon :: dcons)

dcon   : CSYMBOL                        (CSYMBOL, NONE)
       | CSYMBOL OF cexp                (CSYMBOL, SOME cexp)

vali   : SYMBOL eargl2 copt EQ eexp     (let
                                             val loc = s (SYMBOLleft, eexpright)
                                             val t = Option.getOpt (copt, (CWild (KType, loc), loc))

                                             val (e, t) = eargl2 (eexp, t)
                                         in
                                             (SYMBOL, SOME t, e)
                                         end)

copt   :                                (NONE)
       | COLON cexp                     (SOME cexp)

valis  : vali                           ([vali])
       | vali AND valis                 (vali :: valis)

sgn    : sgntm                          (sgntm)
       | FUNCTOR LPAREN CSYMBOL COLON sgn RPAREN COLON sgn
                                        (SgnFun (CSYMBOL, sgn1, sgn2), s (FUNCTORleft, sgn2right))

sgntm  : SIG sgis END                   (SgnConst sgis, s (SIGleft, ENDright))
       | mpath                          (case mpath of
                                             [] => raise Fail "Impossible mpath parse [2]"
                                           | [x] => SgnVar x
                                           | m :: ms => SgnProj (m,
                                                                 List.take (ms, length ms - 1),
                                                                 List.nth (ms, length ms - 1)),
                                         s (mpathleft, mpathright))
       | sgntm WHERE CON SYMBOL EQ cexp (SgnWhere (sgntm, SYMBOL, cexp), s (sgntmleft, cexpright))
       | sgntm WHERE LTYPE SYMBOL EQ cexp(SgnWhere (sgntm, SYMBOL, cexp), s (sgntmleft, cexpright))
       | LPAREN sgn RPAREN              (sgn)

sgi    : CON SYMBOL DCOLON kind         (SgiConAbs (SYMBOL, kind), s (CONleft, kindright))
       | LTYPE SYMBOL                   (SgiConAbs (SYMBOL, (KType, s (LTYPEleft, SYMBOLright))),
                                         s (LTYPEleft, SYMBOLright))
       | CON SYMBOL EQ cexp             (SgiCon (SYMBOL, NONE, cexp), s (CONleft, cexpright))
       | CON SYMBOL DCOLON kind EQ cexp (SgiCon (SYMBOL, SOME kind, cexp), s (CONleft, cexpright))
       | LTYPE SYMBOL EQ cexp           (SgiCon (SYMBOL, SOME (KType, s (LTYPEleft, cexpright)), cexp),
                                         s (LTYPEleft, cexpright))
       | DATATYPE SYMBOL dargs EQ barOpt dcons(SgiDatatype (SYMBOL, dargs, dcons), s (DATATYPEleft, dconsright))
       | DATATYPE SYMBOL dargs EQ DATATYPE CSYMBOL DOT path
                (case dargs of
                     [] => (SgiDatatypeImp (SYMBOL, CSYMBOL :: #1 path, #2 path), s (DATATYPEleft, pathright))
                   | _ => raise Fail "Arguments specified for imported datatype")
       | VAL SYMBOL COLON cexp          (SgiVal (SYMBOL, cexp), s (VALleft, cexpright))

       | STRUCTURE CSYMBOL COLON sgn    (SgiStr (CSYMBOL, sgn), s (STRUCTUREleft, sgnright))
       | SIGNATURE CSYMBOL EQ sgn       (SgiSgn (CSYMBOL, sgn), s (SIGNATUREleft, sgnright))
       | FUNCTOR CSYMBOL LPAREN CSYMBOL COLON sgn RPAREN COLON sgn
                                        (SgiStr (CSYMBOL1,
                                                 (SgnFun (CSYMBOL2, sgn1, sgn2), s (FUNCTORleft, sgn2right))),
                                         s (FUNCTORleft, sgn2right))
       | INCLUDE sgn                    (SgiInclude sgn, s (INCLUDEleft, sgnright))
       | CONSTRAINT cterm TWIDDLE cterm (SgiConstraint (cterm1, cterm2), s (CONSTRAINTleft, ctermright))
       | TABLE SYMBOL COLON cexp        (SgiTable (SYMBOL, entable cexp), s (TABLEleft, cexpright))
       | SEQUENCE SYMBOL                (SgiSequence SYMBOL, s (SEQUENCEleft, SYMBOLright))
       | CLASS SYMBOL                   (SgiClassAbs SYMBOL, s (CLASSleft, SYMBOLright))
       | CLASS SYMBOL EQ cexp           (SgiClass (SYMBOL, cexp), s (CLASSleft, cexpright))
       | CLASS SYMBOL SYMBOL EQ cexp    (let
                                             val loc = s (CLASSleft, cexpright)
                                             val k = (KType, loc)
                                             val c = (CAbs (SYMBOL2, SOME k, cexp), loc)
                                         in
                                             (SgiClass (SYMBOL1, c), s (CLASSleft, cexpright))
                                         end)

sgis   :                                ([])
       | sgi sgis                       (sgi :: sgis)

str    : STRUCT decls END               (StrConst decls, s (STRUCTleft, ENDright))
       | spath                          (spath)
       | FUNCTOR LPAREN CSYMBOL COLON sgn RPAREN DARROW str
                                        (StrFun (CSYMBOL, sgn, NONE, str), s (FUNCTORleft, strright))
       | FUNCTOR LPAREN CSYMBOL COLON sgn RPAREN COLON sgn DARROW str
                                        (StrFun (CSYMBOL, sgn1, SOME sgn2, str), s (FUNCTORleft, strright))
       | spath LPAREN str RPAREN        (StrApp (spath, str), s (spathleft, RPARENright))

spath  : CSYMBOL                        (StrVar CSYMBOL, s (CSYMBOLleft, CSYMBOLright))
       | spath DOT CSYMBOL              (StrProj (spath, CSYMBOL), s (spathleft, CSYMBOLright))

kind   : TYPE                           (KType, s (TYPEleft, TYPEright))
       | NAME                           (KName, s (NAMEleft, NAMEright))
       | LBRACE kind RBRACE             (KRecord kind, s (LBRACEleft, RBRACEright))
       | kind ARROW kind                (KArrow (kind1, kind2), s (kind1left, kind2right))
       | LPAREN kind RPAREN             (#1 kind, s (LPARENleft, RPARENright))
       | KUNIT                          (KUnit, s (KUNITleft, KUNITright))
       | UNDERUNDER                     (KWild, s (UNDERUNDERleft, UNDERUNDERright))
       | LPAREN ktuple RPAREN           (KTuple ktuple, s (LPARENleft, RPARENright))

ktuple : kind STAR kind                 ([kind1, kind2])
       | kind STAR ktuple               (kind :: ktuple)

capps  : cterm                          (cterm)
       | capps cterm                    (CApp (capps, cterm), s (cappsleft, ctermright))

cexp   : capps                          (capps)
       | cexp ARROW cexp                (TFun (cexp1, cexp2), s (cexp1left, cexp2right))
       | SYMBOL kcolon kind ARROW cexp  (TCFun (kcolon, SYMBOL, kind, cexp), s (SYMBOLleft, cexpright))

       | cexp PLUSPLUS cexp             (CConcat (cexp1, cexp2), s (cexp1left, cexp1right))

       | FN cargs DARROW cexp           (#1 (cargs (cexp, (KWild, s (FNleft, cexpright)))))

       | LPAREN cexp RPAREN DCOLON kind (CAnnot (cexp, kind), s (LPARENleft, kindright))

       | UNDER DCOLON kind              (CWild kind, s (UNDERleft, UNDERright))
       | ctuple                         (let
                                             val loc = s (ctupleleft, ctupleright)
                                         in
                                             (TRecord (CRecord (ListUtil.mapi (fn (i, c) =>
                                                                                  ((CName (Int.toString (i + 1)), loc),
                                                                                   c)) ctuple),
                                                       loc), loc)
                                         end)

kcolon : DCOLON                         (Explicit)
       | TCOLON                         (Implicit)

cargs  : carg                           (carg)
       | cargl                          (cargl)

cargl  : cargp cargp                    (cargp1 o cargp2)
       | cargp cargl                    (cargp o cargl)

cargl2 :                                (fn x => x)
       | cargp cargl2                   (cargp o cargl2)

carg   : SYMBOL DCOLON kind             (fn (c, k) =>
                                            let
                                                val loc = s (SYMBOLleft, kindright)
                                            in
                                                ((CAbs (SYMBOL, SOME kind, c), loc),
                                                 (KArrow (kind, k), loc))
                                            end)
       | UNDER DCOLON kind              (fn (c, k) =>
                                            let
                                                val loc = s (UNDERleft, kindright)
                                            in
                                                ((CAbs ("_", SOME kind, c), loc),
                                                 (KArrow (kind, k), loc))
                                            end)
       | cargp                          (cargp)

cargp  : SYMBOL                         (fn (c, k) =>
                                            let
                                                val loc = s (SYMBOLleft, SYMBOLright)
                                            in
                                                ((CAbs (SYMBOL, NONE, c), loc),
                                                 (KArrow ((KWild, loc), k), loc))
                                            end)
       | UNDER                          (fn (c, k) =>
                                            let
                                                val loc = s (UNDERleft, UNDERright)
                                            in
                                                ((CAbs ("_", NONE, c), loc),
                                                 (KArrow ((KWild, loc), k), loc))
                                            end)
       | LPAREN SYMBOL DCOLON kind RPAREN (fn (c, k) =>
                                              let
                                                  val loc = s (LPARENleft, RPARENright)
                                              in
                                                  ((CAbs (SYMBOL, SOME kind, c), loc),
                                                   (KArrow (kind, k), loc))
                                              end)
       | LBRACK cterm TWIDDLE cterm RBRACK (fn (c, k) =>
                                            let
                                                val loc = s (LBRACKleft, RBRACKright)
                                            in
                                                ((CDisjoint (cterm1, cterm2, c), loc),
                                                 k)
                                            end)

path   : SYMBOL                         ([], SYMBOL)
       | CSYMBOL DOT path               (let val (ms, x) = path in (CSYMBOL :: ms, x) end)

cpath  : CSYMBOL                        ([], CSYMBOL)
       | CSYMBOL DOT cpath              (let val (ms, x) = cpath in (CSYMBOL :: ms, x) end)

mpath  : CSYMBOL                        ([CSYMBOL])
       | CSYMBOL DOT mpath              (CSYMBOL :: mpath)

cterm  : LPAREN cexp RPAREN             (#1 cexp, s (LPARENleft, RPARENright))
       | LBRACK rcon RBRACK             (CRecord rcon, s (LBRACKleft, RBRACKright))
       | LBRACK rconn RBRACK            (CRecord rconn, s (LBRACKleft, RBRACKright))
       | LBRACE rcone RBRACE            (TRecord (CRecord rcone, s (LBRACEleft, RBRACEright)),
					 s (LBRACEleft, RBRACEright))
       | DOLLAR cterm                   (TRecord cterm, s (DOLLARleft, ctermright))
       | HASH CSYMBOL                   (CName CSYMBOL, s (HASHleft, CSYMBOLright))
       | HASH INT                       (CName (Int64.toString INT), s (HASHleft, INTright))

       | path                           (CVar path, s (pathleft, pathright))
       | path DOT INT                   (CProj ((CVar path, s (pathleft, pathright)), Int64.toInt INT),
                                         s (pathleft, INTright))
       | UNDER                          (CWild (KWild, s (UNDERleft, UNDERright)), s (UNDERleft, UNDERright))
       | FOLD                           (CFold, s (FOLDleft, FOLDright))
       | UNIT                           (CUnit, s (UNITleft, UNITright))
       | LPAREN ctuplev RPAREN          (CTuple ctuplev, s (LPARENleft, RPARENright))

ctuplev: cexp COMMA cexp                ([cexp1, cexp2])
       | cexp COMMA ctuplev             (cexp :: ctuplev)

ctuple : capps STAR capps               ([capps1, capps2])
       | capps STAR ctuple              (capps :: ctuple)

rcon   :                                ([])
       | ident EQ cexp                  ([(ident, cexp)])
       | ident EQ cexp COMMA rcon       ((ident, cexp) :: rcon)

rconn  : ident                          ([(ident, (CUnit, s (identleft, identright)))])
       | ident COMMA rconn              ((ident, (CUnit, s (identleft, identright))) :: rconn)

rcone  :                                ([])
       | ident COLON cexp               ([(ident, cexp)])
       | ident COLON cexp COMMA rcone   ((ident, cexp) :: rcone)

ident  : CSYMBOL                        (CName CSYMBOL, s (CSYMBOLleft, CSYMBOLright))
       | INT                            (CName (Int64.toString INT), s (INTleft, INTright))
       | SYMBOL                         (CVar ([], SYMBOL), s (SYMBOLleft, SYMBOLright))

eapps  : eterm                          (eterm)
       | eapps eterm                    (EApp (eapps, eterm), s (eappsleft, etermright))
       | eapps LBRACK cexp RBRACK       (ECApp (eapps, cexp), s (eappsleft, RBRACKright))

eexp   : eapps                          (eapps)
       | FN eargs DARROW eexp           (let
                                             val loc = s (FNleft, eexpright)
                                         in
                                             #1 (eargs (eexp, (CWild (KType, loc), loc)))
                                         end)
       | eexp COLON cexp                (EAnnot (eexp, cexp), s (eexpleft, cexpright))
       | eexp MINUSMINUS cexp           (ECut (eexp, cexp), s (eexpleft, cexpright))
       | CASE eexp OF barOpt branch branchs (ECase (eexp, branch :: branchs), s (CASEleft, branchsright))
       | IF eexp THEN eexp ELSE eexp    (let
                                             val loc = s (IFleft, eexp3right)
                                         in
                                             (ECase (eexp1, [((PCon (["Basis"], "True", NONE), loc), eexp2),
                                                             ((PCon (["Basis"], "False", NONE), loc), eexp3)]), loc)
                                         end)
       | SYMBOL LARROW eexp SEMI eexp   (let
                                             val loc = s (SYMBOLleft, eexp2right)
                                             val e = (EVar (["Basis"], "bind"), loc)
                                             val e = (EApp (e, eexp1), loc)
                                         in
                                             (EApp (e, (EAbs (SYMBOL, NONE, eexp2), loc)), loc)
                                         end)
       | UNIT LARROW eexp SEMI eexp     (let
                                             val loc = s (UNITleft, eexp2right)
                                             val e = (EVar (["Basis"], "bind"), loc)
                                             val e = (EApp (e, eexp1), loc)
                                             val t = (TRecord (CRecord [], loc), loc)
                                         in
                                             (EApp (e, (EAbs ("_", SOME t, eexp2), loc)), loc)
                                         end)
       | eexp EQ eexp                   (native_op ("eq", eexp1, eexp2, s (eexp1left, eexp2right)))
       | eexp NE eexp                   (native_op ("ne", eexp1, eexp2, s (eexp1left, eexp2right)))
       | eexp WITH cterm EQ eexp        (EWith (eexp1, cterm, eexp2), s (eexp1left, eexp2right))

eargs  : earg                           (earg)
       | eargl                          (eargl)

eargl  : eargp eargp                    (eargp1 o eargp2)
       | eargp eargl                    (eargp o eargl)

eargl2 :                                (fn x => x)
       | eargp eargl2                   (eargp o eargl2)

earg   : SYMBOL kcolon kind             (fn (e, t) =>
                                            let
                                                val loc = s (SYMBOLleft, kindright)
                                            in
                                                ((ECAbs (kcolon, SYMBOL, kind, e), loc),
                                                 (TCFun (kcolon, SYMBOL, kind, t), loc))
                                            end)
       | SYMBOL COLON cexp              (fn (e, t) =>
                                            let
                                                val loc = s (SYMBOLleft, cexpright)
                                            in
                                                ((EAbs (SYMBOL, SOME cexp, e), loc),
                                                 (TFun (cexp, t), loc))
                                            end)
       | UNDER COLON cexp               (fn (e, t) =>
                                            let
                                                val loc = s (UNDERleft, cexpright)
                                            in
                                                ((EAbs ("_", SOME cexp, e), loc),
                                                 (TFun (cexp, t), loc))
                                            end)
       | eargp                          (eargp)

eargp  : SYMBOL                         (fn (e, t) =>
                                            let
                                                val loc = s (SYMBOLleft, SYMBOLright)
                                            in
                                                ((EAbs (SYMBOL, NONE, e), loc),
                                                 (TFun ((CWild (KType, loc), loc), t), loc))
                                            end)
       | UNIT                           (fn (e, t) =>
                                            let
                                                val loc = s (UNITleft, UNITright)
                                                val t' = (TRecord (CRecord [], loc), loc)
                                            in
                                                ((EAbs ("_", SOME t', e), loc),
                                                 (TFun (t', t), loc))
                                            end)
       | UNDER                          (fn (e, t) =>
                                            let
                                                val loc = s (UNDERleft, UNDERright)
                                            in
                                                ((EAbs ("_", NONE, e), loc),
                                                 (TFun ((CWild (KType, loc), loc), t), loc))
                                            end)
       | LPAREN SYMBOL kcolon kind RPAREN(fn (e, t) =>
                                             let
                                                 val loc = s (LPARENleft, RPARENright)
                                             in
                                                 ((ECAbs (kcolon, SYMBOL, kind, e), loc),
                                                  (TCFun (kcolon, SYMBOL, kind, t), loc))
                                             end)
       | LPAREN SYMBOL COLON cexp RPAREN  (fn (e, t) =>
                                              let
                                                  val loc = s (LPARENleft, RPARENright)
                                              in
                                                  ((EAbs (SYMBOL, SOME cexp, e), loc),
                                                   (TFun (cexp, t), loc))
                                              end)
       | LPAREN UNDER COLON cexp RPAREN   (fn (e, t) =>
                                            let
                                                val loc = s (LPARENleft, RPARENright)
                                            in
                                                ((EAbs ("_", SOME cexp, e), loc),
                                                 (TFun (cexp, t), loc))
                                            end)
       | LPAREN cterm TWIDDLE cterm RPAREN(fn (e, t) =>
                                            let
                                                val loc = s (LPARENleft, RPARENright)
                                            in
                                                ((EDisjoint (cterm1, cterm2, e), loc),
                                                 (CDisjoint (cterm1, cterm2, t), loc))
                                            end)
       | LBRACK cterm TWIDDLE cterm RBRACK(fn (e, t) =>
                                            let
                                                val loc = s (LBRACKleft, RBRACKright)
                                            in
                                                ((EDisjoint (cterm1, cterm2, e), loc),
                                                 (CDisjoint (cterm1, cterm2, t), loc))
                                            end)

eterm  : LPAREN eexp RPAREN             (#1 eexp, s (LPARENleft, RPARENright))
       | LPAREN etuple RPAREN           (let
                                             val loc = s (LPARENleft, RPARENright)
                                         in
                                             (ERecord (ListUtil.mapi (fn (i, e) =>
                                                                         ((CName (Int.toString (i + 1)), loc),
                                                                          e)) etuple), loc)
                                         end)

       | path                           (EVar path, s (pathleft, pathright))
       | cpath                          (EVar cpath, s (cpathleft, cpathright))
       | LBRACE rexp RBRACE             (ERecord rexp, s (LBRACEleft, RBRACEright))
       | UNIT                           (ERecord [], s (UNITleft, UNITright))

       | INT                            (EPrim (Prim.Int INT), s (INTleft, INTright))
       | FLOAT                          (EPrim (Prim.Float FLOAT), s (FLOATleft, FLOATright))
       | STRING                         (EPrim (Prim.String STRING), s (STRINGleft, STRINGright))

       | path DOT idents                (let
                                             val loc = s (pathleft, identsright)
                                         in
                                             foldl (fn (ident, e) =>
                                                       (EField (e, ident), loc))
                                                   (EVar path, s (pathleft, pathright)) idents
                                         end)
       | FOLD                           (EFold, s (FOLDleft, FOLDright))

       | XML_BEGIN xml XML_END          (let
                                             val loc = s (XML_BEGINleft, XML_ENDright)
                                         in
                                             if XML_BEGIN = "xml" then
                                                 ()
                                             else
                                                 ErrorMsg.errorAt loc "Initial XML tag pair aren't both tagged \"xml\".";
                                             xml
                                         end)
       | XML_BEGIN XML_END              (let
                                             val loc = s (XML_BEGINleft, XML_ENDright)
                                         in
                                             if XML_BEGIN = "xml" then
                                                 ()
                                             else
                                                 ErrorMsg.errorAt loc "Initial XML tag pair aren't both tagged \"xml\".";
                                             (EApp ((EVar (["Basis"], "cdata"), loc),
                                                    (EPrim (Prim.String ""), loc)),
                                              loc)
                                         end)
       | XML_BEGIN_END                  (let
                                             val loc = s (XML_BEGIN_ENDleft, XML_BEGIN_ENDright)
                                         in
                                             if XML_BEGIN_END = "xml" then
                                                 ()
                                             else
                                                 ErrorMsg.errorAt loc "Initial XML tag pair aren't both tagged \"xml\".";
                                             (EApp ((EVar (["Basis"], "cdata"), loc),
                                                    (EPrim (Prim.String ""), loc)),
                                              loc)
                                         end)

       | LPAREN query RPAREN            (query)
       | LPAREN CWHERE sqlexp RPAREN    (sqlexp)
       | LPAREN SQL sqlexp RPAREN       (sqlexp)

       | LPAREN INSERT INTO texp LPAREN fields RPAREN VALUES LPAREN sqlexps RPAREN RPAREN
                                        (let
                                             val loc = s (LPAREN1left, RPAREN3right)

                                             val e = (EVar (["Basis"], "insert"), loc)
                                             val e = (EApp (e, texp), loc)
                                         in
                                             if length fields <> length sqlexps then
                                                 ErrorMsg.errorAt loc "Length mismatch in INSERT field specification"
                                             else
                                                 ();
                                             (EApp (e, (ERecord (ListPair.zip (fields, sqlexps)), loc)), loc)
                                         end)
       | LPAREN enterDml UPDATE texp SET fsets CWHERE sqlexp leaveDml RPAREN
                                        (let
                                             val loc = s (LPARENleft, RPARENright)

                                             val e = (EVar (["Basis"], "update"), loc)
                                             val e = (ECApp (e, (CWild (KRecord (KType, loc), loc), loc)), loc)
                                             val e = (EApp (e, (ERecord fsets, loc)), loc)
                                             val e = (EApp (e, texp), loc)
                                         in
                                             (EApp (e, sqlexp), loc)
                                         end)
       | LPAREN enterDml DELETE FROM texp CWHERE sqlexp leaveDml RPAREN
                                        (let
                                             val loc = s (LPARENleft, RPARENright)

                                             val e = (EVar (["Basis"], "delete"), loc)
                                             val e = (EApp (e, texp), loc)
                                         in
                                             (EApp (e, sqlexp), loc)
                                         end)

       | UNDER                          (EWild, s (UNDERleft, UNDERright))

enterDml :                              (inDml := true)
leaveDml :                              (inDml := false)

texp   : SYMBOL                         (EVar ([], SYMBOL), s (SYMBOLleft, SYMBOLright))
       | LBRACE LBRACE eexp RBRACE RBRACE (eexp)

fields : fident                         ([fident])
       | fident COMMA fields            (fident :: fields)

sqlexps: sqlexp                         ([sqlexp])
       | sqlexp COMMA sqlexps           (sqlexp :: sqlexps)

fsets  : fident EQ sqlexp               ([(fident, sqlexp)])
       | fident EQ sqlexp COMMA fsets   ((fident, sqlexp) :: fsets)

idents : ident                          ([ident])
       | ident DOT idents               (ident :: idents)

etuple : eexp COMMA eexp                ([eexp1, eexp2])
       | eexp COMMA etuple              (eexp :: etuple)

branch : pat DARROW eexp                (pat, eexp)

branchs:                                ([])
       | BAR branch branchs             (branch :: branchs)

pat    : pterm                          (pterm)
       | cpath pterm                    (PCon (#1 cpath, #2 cpath, SOME pterm), s (cpathleft, ptermright))

pterm  : SYMBOL                         (PVar SYMBOL, s (SYMBOLleft, SYMBOLright))
       | cpath                          (PCon (#1 cpath, #2 cpath, NONE), s (cpathleft, cpathright))
       | UNDER                          (PWild, s (UNDERleft, UNDERright))
       | INT                            (PPrim (Prim.Int INT), s (INTleft, INTright))
       | STRING                         (PPrim (Prim.String STRING), s (STRINGleft, STRINGright))
       | LPAREN pat RPAREN              (pat)
       | LBRACE RBRACE                  (PRecord ([], false), s (LBRACEleft, RBRACEright))
       | UNIT                           (PRecord ([], false), s (UNITleft, UNITright))
       | LBRACE rpat RBRACE             (PRecord rpat, s (LBRACEleft, RBRACEright))
       | LPAREN ptuple RPAREN           (PRecord (ListUtil.mapi (fn (i, p) => (Int.toString (i + 1), p)) ptuple,
                                                  false),
                                         s (LPARENleft, RPARENright))

rpat   : CSYMBOL EQ pat                 ([(CSYMBOL, pat)], false)
       | INT EQ pat                     ([(Int64.toString INT, pat)], false)
       | DOTDOTDOT                      ([], true)
       | CSYMBOL EQ pat COMMA rpat      ((CSYMBOL, pat) :: #1 rpat, #2 rpat)
       | INT EQ pat COMMA rpat          ((Int64.toString INT, pat) :: #1 rpat, #2 rpat)

ptuple : pat COMMA pat                  ([pat1, pat2])
       | pat COMMA ptuple               (pat :: ptuple)

rexp   :                                ([])
       | ident EQ eexp                  ([(ident, eexp)])
       | ident EQ eexp COMMA rexp       ((ident, eexp) :: rexp)

xml    : xmlOne xml                     (let
                                             val pos = s (xmlOneleft, xmlright)
                                         in
                                             (EApp ((EApp (
                                                     (EVar (["Basis"], "join"), pos),
                                                  xmlOne), pos),
                                                    xml), pos)
                                         end)
       | xmlOne                         (xmlOne)

xmlOne : NOTAGS                         (EApp ((EVar (["Basis"], "cdata"), s (NOTAGSleft, NOTAGSright)),
                                               (EPrim (Prim.String NOTAGS), s (NOTAGSleft, NOTAGSright))),
                                         s (NOTAGSleft, NOTAGSright))
       | tag DIVIDE GT                  (let
                                             val pos = s (tagleft, GTright)
                                         in
                                             (EApp (#2 tag,
                                                    (EApp ((EVar (["Basis"], "cdata"), pos),
                                                           (EPrim (Prim.String ""), pos)),
                                                     pos)), pos)
                                         end)
         
       | tag GT xml END_TAG             (let
                                             val pos = s (tagleft, GTright)
                                             val et = tagIn END_TAG
                                         in
                                             if #1 tag = et then
                                                 if et = "lform" then
                                                     (EApp ((EVar (["Basis"], "lform"), pos),
                                                            xml), pos)
                                                 else
                                                     (EApp (#2 tag, xml), pos)
                                             else
                                                 (if ErrorMsg.anyErrors () then
                                                      ()
                                                  else
                                                      ErrorMsg.errorAt pos "Begin and end tags don't match.";
                                                  (EFold, pos))
                                         end)
       | LBRACE eexp RBRACE             (eexp)

tag    : tagHead attrs                  (let
                                             val pos = s (tagHeadleft, attrsright)
                                         in
                                             (#1 tagHead,
                                              (EApp ((EApp ((EVar (["Basis"], "tag"), pos),
                                                            (ERecord attrs, pos)), pos),
                                                     (EApp (#2 tagHead,
                                                            (ERecord [], pos)), pos)),
                                               pos))
                                         end)

tagHead: BEGIN_TAG                      (let
                                             val bt = tagIn BEGIN_TAG
                                             val pos = s (BEGIN_TAGleft, BEGIN_TAGright)
                                         in
                                             (bt,
                                              (EVar ([], bt), pos))
                                         end)
       | tagHead LBRACE cexp RBRACE     (#1 tagHead, (ECApp (#2 tagHead, cexp), s (tagHeadleft, RBRACEright)))
                                          
attrs  :                                ([])
       | attr attrs                     (attr :: attrs)

attr   : SYMBOL EQ attrv                ((CName (capitalize SYMBOL), s (SYMBOLleft, SYMBOLright)), attrv)
                
attrv  : INT                            (EPrim (Prim.Int INT), s (INTleft, INTright))
       | FLOAT                          (EPrim (Prim.Float FLOAT), s (FLOATleft, FLOATright))
       | STRING                         (EPrim (Prim.String STRING), s (STRINGleft, STRINGright))
       | LBRACE eexp RBRACE             (eexp)

query  : query1 obopt lopt ofopt        (let
                                             val loc = s (query1left, query1right)

                                             val re = (ERecord [((CName "Rows", loc),
                                                                 query1),
                                                                ((CName "OrderBy", loc),
                                                                 obopt),
                                                                ((CName "Limit", loc),
                                                                 lopt),
                                                                ((CName "Offset", loc),
                                                                 ofopt)], loc)
                                         in
                                             (EApp ((EVar (["Basis"], "sql_query"), loc), re), loc)
                                         end)
                
query1 : SELECT select FROM tables wopt gopt hopt
                                        (let
                                             val loc = s (SELECTleft, tablesright)

                                             val (sel, exps) =
                                                 case select of
                                                     Star => (map (fn (nm, _) =>
                                                                      (nm, (CTuple [(CWild (KRecord (KType, loc), loc),
                                                                                     loc),
                                                                                    (CRecord [], loc)],
                                                                            loc))) tables,
                                                              [])
                                                   | Items sis =>
                                                     let
                                                         val tabs = map (fn (nm, _) => (nm, (CRecord [], loc))) tables
                                                         val (tabs, exps) = foldl (amend_select loc) (tabs, []) sis
                                                     in
                                                         (map (fn (nm, c) => (nm,
                                                                              (CTuple [c,
                                                                                       (CWild (KRecord (KType, loc), loc),
                                                                                        loc)], loc))) tabs,
                                                          exps)
                                                     end

                                             val sel = (CRecord sel, loc)

                                             val grp = case gopt of
                                                           NONE => (ECApp ((EVar (["Basis"], "sql_subset_all"), loc),
                                                                           (CWild (KRecord (KRecord (KType, loc), loc),
                                                                                   loc), loc)), loc)
                                                         | SOME gis =>
                                                           let
                                                               val tabs = map (fn (nm, _) =>
                                                                                  (nm, (CRecord [], loc))) tables
                                                               val tabs = foldl (amend_group loc) tabs gis

                                                               val tabs = map (fn (nm, c) =>
                                                                                  (nm,
                                                                                   (CTuple [c,
                                                                                            (CWild (KRecord (KType, loc),
                                                                                                    loc),
                                                                                             loc)], loc))) tabs
                                                           in
                                                               (ECApp ((EVar (["Basis"], "sql_subset"), loc),
                                                                       (CRecord tabs, loc)), loc)
                                                           end

                                             val e = (EVar (["Basis"], "sql_query1"), loc)
                                             val re = (ERecord [((CName "From", loc),
                                                                 (ERecord tables, loc)),
                                                                ((CName "Where", loc),
                                                                 wopt),
                                                                ((CName "GroupBy", loc),
                                                                 grp),
                                                                ((CName "Having", loc),
                                                                 hopt),
                                                                ((CName "SelectFields", loc),
                                                                 (ECApp ((EVar (["Basis"], "sql_subset"), loc),
                                                                         sel), loc)),
                                                                ((CName "SelectExps", loc),
                                                                 (ERecord exps, loc))], loc)

                                             val e = (EApp (e, re), loc)
                                         in
                                             e
                                         end)
       | query1 UNION query1            (sql_relop ("union", query11, query12, s (query11left, query12right)))
       | query1 INTERSECT query1        (sql_relop ("intersect", query11, query12, s (query11left, query12right)))
       | query1 EXCEPT query1           (sql_relop ("except", query11, query12, s (query11left, query12right)))

tables : table                          ([table])
       | table COMMA tables             (table :: tables)

tname  : CSYMBOL                        (CName CSYMBOL, s (CSYMBOLleft, CSYMBOLright))
       | LBRACE cexp RBRACE             (cexp)

table  : SYMBOL                         ((CName (capitalize SYMBOL), s (SYMBOLleft, SYMBOLright)),
                                         (EVar ([], SYMBOL), s (SYMBOLleft, SYMBOLright)))
       | SYMBOL AS tname                (tname, (EVar ([], SYMBOL), s (SYMBOLleft, SYMBOLright)))
       | LBRACE LBRACE eexp RBRACE RBRACE AS tname    (tname, eexp)

tident : SYMBOL                         (CName (capitalize SYMBOL), s (SYMBOLleft, SYMBOLright))
       | CSYMBOL                        (CName CSYMBOL, s (CSYMBOLleft, CSYMBOLright))
       | LBRACE LBRACE cexp RBRACE RBRACE (cexp)

fident : CSYMBOL                        (CName CSYMBOL, s (CSYMBOLleft, CSYMBOLright))
       | LBRACE cexp RBRACE             (cexp)

seli   : tident DOT fident              (Field (tident, fident))
       | sqlexp AS fident               (Exp (fident, sqlexp))
       | tident DOT LBRACE LBRACE cexp RBRACE RBRACE (Fields (tident, cexp))

selis  : seli                           ([seli])
       | seli COMMA selis               (seli :: selis)

select : STAR                           (Star)
       | selis                          (Items selis)

sqlexp : TRUE                           (sql_inject (EVar (["Basis"], "True"),
                                                     EVar (["Basis"], "sql_bool"),
                                                     s (TRUEleft, TRUEright)))
       | FALSE                          (sql_inject (EVar (["Basis"], "False"),
                                                     EVar (["Basis"], "sql_bool"),
                                                     s (FALSEleft, FALSEright)))

       | INT                            (sql_inject (EPrim (Prim.Int INT),
                                                     EVar (["Basis"], "sql_int"),
                                                     s (INTleft, INTright)))
       | FLOAT                          (sql_inject (EPrim (Prim.Float FLOAT),
                                                     EVar (["Basis"], "sql_float"),
                                                     s (FLOATleft, FLOATright)))
       | STRING                         (sql_inject (EPrim (Prim.String STRING),
                                                     EVar (["Basis"], "sql_string"),
                                                     s (STRINGleft, STRINGright)))

       | tident DOT fident              (let
                                             val loc = s (tidentleft, fidentright)
                                             val e = (EVar (["Basis"], "sql_field"), loc)
                                             val e = (ECApp (e, tident), loc)
                                         in
                                             (ECApp (e, fident), loc)
                                         end)
       | CSYMBOL                         (let
                                             val loc = s (CSYMBOLleft, CSYMBOLright)
                                          in
                                              if !inDml then
                                                  let
                                                      val e = (EVar (["Basis"], "sql_field"), loc)
                                                      val e = (ECApp (e, (CName "T", loc)), loc)
                                                  in
                                                      (ECApp (e, (CName CSYMBOL, loc)), loc)
                                                  end
                                              else
                                                  let
                                                      val e = (EVar (["Basis"], "sql_exp"), loc)
                                                  in
                                                      (ECApp (e, (CName CSYMBOL, loc)), loc)
                                                  end
                                          end)

       | sqlexp EQ sqlexp               (sql_compare ("eq", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp NE sqlexp               (sql_compare ("ne", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp LT sqlexp               (sql_compare ("lt", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp LE sqlexp               (sql_compare ("le", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp GT sqlexp               (sql_compare ("gt", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp GE sqlexp               (sql_compare ("ge", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))

       | sqlexp CAND sqlexp             (sql_binary ("and", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | sqlexp OR sqlexp               (sql_binary ("or", sqlexp1, sqlexp2, s (sqlexp1left, sqlexp2right)))
       | NOT sqlexp                     (sql_unary ("not", sqlexp, s (NOTleft, sqlexpright)))

       | LBRACE eexp RBRACE             (sql_inject (#1 eexp,
                                                     EWild,
                                                     s (LBRACEleft, RBRACEright)))
       | LPAREN sqlexp RPAREN           (sqlexp)

       | COUNT LPAREN STAR RPAREN       (let
                                             val loc = s (COUNTleft, RPARENright)
                                         in
                                             (EApp ((EVar (["Basis"], "sql_count"), loc),
                                                    (ERecord [], loc)), loc)
                                         end)
       | sqlagg LPAREN sqlexp RPAREN    (let
                                             val loc = s (sqlaggleft, RPARENright)

                                             val e = (EApp ((EVar (["Basis"], "sql_" ^ sqlagg), loc),
                                                            (EWild, loc)), loc)
                                             val e = (EApp ((EVar (["Basis"], "sql_aggregate"), loc),
                                                            e), loc)
                                         in
                                             (EApp (e, sqlexp), loc)
                                         end)

wopt   :                                (sql_inject (EVar (["Basis"], "True"),
                                                     EVar (["Basis"], "sql_bool"),
                                                     dummy))
       | CWHERE sqlexp                  (sqlexp)

groupi : tident DOT fident              (GField (tident, fident))

groupis: groupi                         ([groupi])
       | groupi COMMA groupis           (groupi :: groupis)

gopt   :                                (NONE)
       | GROUP BY groupis               (SOME groupis)

hopt   :                                (sql_inject (EVar (["Basis"], "True"),
                                                     EVar (["Basis"], "sql_bool"),
                                                     dummy))
       | HAVING sqlexp                  (sqlexp)

obopt  :                                (ECApp ((EVar (["Basis"], "sql_order_by_Nil"), dummy),
                                                (CWild (KRecord (KType, dummy), dummy), dummy)),
                                         dummy)
       | ORDER BY obexps                (obexps)

obitem : sqlexp diropt                  (sqlexp, diropt)

obexps : obitem                         (let
                                             val loc = s (obitemleft, obitemright)

                                             val e' = (ECApp ((EVar (["Basis"], "sql_order_by_Nil"), loc),
                                                              (CWild (KRecord (KType, loc), loc), loc)),
                                                       loc)
                                             val e = (EApp ((EVar (["Basis"], "sql_order_by_Cons"), loc),
                                                            #1 obitem), loc)
                                             val e = (EApp (e, #2 obitem), loc)
                                         in
                                             (EApp (e, e'), loc)
                                         end)
       | obitem COMMA obexps            (let
                                             val loc = s (obitemleft, obexpsright)

                                             val e = (EApp ((EVar (["Basis"], "sql_order_by_Cons"), loc),
                                                            #1 obitem), loc)
                                             val e = (EApp (e, #2 obitem), loc)
                                         in
                                             (EApp (e, obexps), loc)
                                         end)

diropt :                                (EVar (["Basis"], "sql_asc"), dummy)
       | ASC                            (EVar (["Basis"], "sql_asc"), s (ASCleft, ASCright))
       | DESC                           (EVar (["Basis"], "sql_desc"), s (DESCleft, DESCright))

lopt   :                                 (EVar (["Basis"], "sql_no_limit"), dummy)
       | LIMIT ALL                       (EVar (["Basis"], "sql_no_limit"), dummy)
       | LIMIT sqlint                    (let
                                              val loc = s (LIMITleft, sqlintright)
                                          in
                                              (EApp ((EVar (["Basis"], "sql_limit"), loc), sqlint), loc)
                                          end)

ofopt  :                                 (EVar (["Basis"], "sql_no_offset"), dummy)
       | OFFSET sqlint                   (let
                                              val loc = s (OFFSETleft, sqlintright)
                                          in
                                              (EApp ((EVar (["Basis"], "sql_offset"), loc), sqlint), loc)
                                          end)

sqlint : INT                             (EPrim (Prim.Int INT), s (INTleft, INTright))
       | LBRACE eexp RBRACE              (eexp)

sqlagg : AVG                             ("avg")
       | SUM                             ("sum")
       | MIN                             ("min")
       | MAX                             ("max")