summaryrefslogtreecommitdiff
path: root/gcc/ada/prj-strt.adb
blob: b1388079719527156d316c7cf3dfbc66fff6a74f (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
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             P R J . S T R T                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2001-2005, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Err_Vars; use Err_Vars;
with Namet;    use Namet;
with Prj.Attr; use Prj.Attr;
with Prj.Err;  use Prj.Err;
with Snames;
with Table;
with Uintp;    use Uintp;

package body Prj.Strt is

   Buffer      : String_Access;
   Buffer_Last : Natural := 0;

   type Choice_String is record
      The_String   : Name_Id;
      Already_Used : Boolean := False;
   end record;
   --  The string of a case label, and an indication that it has already
   --  been used (to avoid duplicate case labels).

   Choices_Initial   : constant := 10;
   Choices_Increment : constant := 50;

   Choice_Node_Low_Bound  : constant := 0;
   Choice_Node_High_Bound : constant := 099_999_999;
   --  In practice, infinite

   type Choice_Node_Id is
     range Choice_Node_Low_Bound .. Choice_Node_High_Bound;

   First_Choice_Node_Id : constant Choice_Node_Id :=
     Choice_Node_Low_Bound;

   package Choices is
      new Table.Table (Table_Component_Type => Choice_String,
                       Table_Index_Type     => Choice_Node_Id,
                       Table_Low_Bound      => First_Choice_Node_Id,
                       Table_Initial        => Choices_Initial,
                       Table_Increment      => Choices_Increment,
                       Table_Name           => "Prj.Strt.Choices");
   --  Used to store the case labels and check that there is no duplicate

   package Choice_Lasts is
      new Table.Table (Table_Component_Type => Choice_Node_Id,
                       Table_Index_Type     => Nat,
                       Table_Low_Bound      => 1,
                       Table_Initial        => 10,
                       Table_Increment      => 100,
                       Table_Name           => "Prj.Strt.Choice_Lasts");
   --  Used to store the indices of the choices in table Choices,
   --  to distinguish nested case constructions.

   Choice_First : Choice_Node_Id := 0;
   --  Index in table Choices of the first case label of the current
   --  case construction. Zero means no current case construction.

   type Name_Location is record
      Name     : Name_Id := No_Name;
      Location : Source_Ptr := No_Location;
   end record;
   --  Store the identifier and the location of a simple name

   package Names is
      new Table.Table (Table_Component_Type => Name_Location,
                       Table_Index_Type     => Nat,
                       Table_Low_Bound      => 1,
                       Table_Initial        => 10,
                       Table_Increment      => 100,
                       Table_Name           => "Prj.Strt.Names");
   --  Used to accumulate the single names of a name

   procedure Add (This_String : Name_Id);
   --  Add a string to the case label list, indicating that it has not
   --  yet been used.

   procedure Add_To_Names (NL : Name_Location);
   --  Add one single names to table Names

   procedure External_Reference
     (In_Tree         : Project_Node_Tree_Ref;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id;
      External_Value  : out Project_Node_Id);
   --  Parse an external reference. Current token is "external"

   procedure Attribute_Reference
     (In_Tree         : Project_Node_Tree_Ref;
      Reference       : out Project_Node_Id;
      First_Attribute : Attribute_Node_Id;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id);
   --  Parse an attribute reference. Current token is an apostrophe

   procedure Terms
     (In_Tree         : Project_Node_Tree_Ref;
      Term            : out Project_Node_Id;
      Expr_Kind       : in out Variable_Kind;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id;
      Optional_Index  : Boolean);
   --  Recursive procedure to parse one term or several terms concatenated
   --  using "&".

   ---------
   -- Add --
   ---------

   procedure Add (This_String : Name_Id) is
   begin
      Choices.Increment_Last;
      Choices.Table (Choices.Last) :=
        (The_String   => This_String,
         Already_Used => False);
   end Add;

   ------------------
   -- Add_To_Names --
   ------------------

   procedure Add_To_Names (NL : Name_Location) is
   begin
      Names.Increment_Last;
      Names.Table (Names.Last) := NL;
   end Add_To_Names;

   -------------------------
   -- Attribute_Reference --
   -------------------------

   procedure Attribute_Reference
     (In_Tree         : Project_Node_Tree_Ref;
      Reference       : out Project_Node_Id;
      First_Attribute : Attribute_Node_Id;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id)
   is
      Current_Attribute : Attribute_Node_Id := First_Attribute;

   begin
      --  Declare the node of the attribute reference

      Reference :=
        Default_Project_Node
          (Of_Kind => N_Attribute_Reference, In_Tree => In_Tree);
      Set_Location_Of (Reference, In_Tree, To => Token_Ptr);
      Scan (In_Tree); --  past apostrophe

      --  Body may be an attribute name

      if Token = Tok_Body then
         Token      := Tok_Identifier;
         Token_Name := Snames.Name_Body;
      end if;

      Expect (Tok_Identifier, "identifier");

      if Token = Tok_Identifier then
         Set_Name_Of (Reference, In_Tree, To => Token_Name);

         --  Check if the identifier is one of the attribute identifiers in the
         --  context (package or project level attributes).

         Current_Attribute :=
           Attribute_Node_Id_Of (Token_Name, Starting_At => First_Attribute);

         --  If the identifier is not allowed, report an error

         if Current_Attribute = Empty_Attribute then
            Error_Msg_Name_1 := Token_Name;
            Error_Msg ("unknown attribute %", Token_Ptr);
            Reference := Empty_Node;

            --  Scan past the attribute name

            Scan (In_Tree);

         else
            --  Give its characteristics to this attribute reference

            Set_Project_Node_Of (Reference, In_Tree, To => Current_Project);
            Set_Package_Node_Of (Reference, In_Tree, To => Current_Package);
            Set_Expression_Kind_Of
              (Reference, In_Tree, To => Variable_Kind_Of (Current_Attribute));
            Set_Case_Insensitive
              (Reference, In_Tree,
               To => Attribute_Kind_Of (Current_Attribute) =
                       Case_Insensitive_Associative_Array);

            --  Scan past the attribute name

            Scan (In_Tree);

            --  If the attribute is an associative array, get the index

            if Attribute_Kind_Of (Current_Attribute) /= Single then
               Expect (Tok_Left_Paren, "`(`");

               if Token = Tok_Left_Paren then
                  Scan (In_Tree);
                  Expect (Tok_String_Literal, "literal string");

                  if Token = Tok_String_Literal then
                     Set_Associative_Array_Index_Of
                       (Reference, In_Tree, To => Token_Name);
                     Scan (In_Tree);
                     Expect (Tok_Right_Paren, "`)`");

                     if Token = Tok_Right_Paren then
                        Scan (In_Tree);
                     end if;
                  end if;
               end if;
            end if;
         end if;

         --  Change name of obsolete attributes

         if Reference /= Empty_Node then
            case Name_Of (Reference, In_Tree) is
               when Snames.Name_Specification =>
                  Set_Name_Of (Reference, In_Tree, To => Snames.Name_Spec);

               when Snames.Name_Specification_Suffix =>
                  Set_Name_Of
                    (Reference, In_Tree, To => Snames.Name_Spec_Suffix);

               when Snames.Name_Implementation =>
                  Set_Name_Of (Reference, In_Tree, To => Snames.Name_Body);

               when Snames.Name_Implementation_Suffix =>
                  Set_Name_Of
                    (Reference, In_Tree, To => Snames.Name_Body_Suffix);

               when others =>
                  null;
            end case;
         end if;
      end if;
   end Attribute_Reference;

   ---------------------------
   -- End_Case_Construction --
   ---------------------------

   procedure End_Case_Construction
     (Check_All_Labels   : Boolean;
      Case_Location      : Source_Ptr)
   is
      Non_Used : Natural := 0;
      First_Non_Used : Choice_Node_Id := First_Choice_Node_Id;
   begin
      --  First, if Check_All_Labels is True, check if all values
      --  of the string type have been used.

      if Check_All_Labels then
         for Choice in Choice_First .. Choices.Last loop
               if not Choices.Table (Choice).Already_Used then
                  Non_Used := Non_Used + 1;

                  if Non_Used = 1 then
                     First_Non_Used := Choice;
                  end if;
               end if;
         end loop;

         --  If only one is not used, report a single warning for this value

         if Non_Used = 1 then
            Error_Msg_Name_1 := Choices.Table (First_Non_Used).The_String;
            Error_Msg ("?value { is not used as label", Case_Location);

         --  If several are not used, report a warning for each one of them

         elsif Non_Used > 1 then
            Error_Msg
              ("?the following values are not used as labels:",
               Case_Location);

            for Choice in First_Non_Used .. Choices.Last loop
               if not Choices.Table (Choice).Already_Used then
                  Error_Msg_Name_1 := Choices.Table (Choice).The_String;
                  Error_Msg ("\?{", Case_Location);
               end if;
            end loop;
         end if;
      end if;

      --  If this is the only case construction, empty the tables

      if Choice_Lasts.Last = 1 then
         Choice_Lasts.Set_Last (0);
         Choices.Set_Last (First_Choice_Node_Id);
         Choice_First := 0;

      elsif Choice_Lasts.Last = 2 then
         --  This is the second case onstruction, set the tables to the first

         Choice_Lasts.Set_Last (1);
         Choices.Set_Last (Choice_Lasts.Table (1));
         Choice_First := 1;

      else
         --  This is the 3rd or more case construction, set the tables to the
         --  previous one.

         Choice_Lasts.Decrement_Last;
         Choices.Set_Last (Choice_Lasts.Table (Choice_Lasts.Last));
         Choice_First := Choice_Lasts.Table (Choice_Lasts.Last - 1) + 1;
      end if;
   end End_Case_Construction;

   ------------------------
   -- External_Reference --
   ------------------------

   procedure External_Reference
     (In_Tree         : Project_Node_Tree_Ref;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id;
      External_Value  : out Project_Node_Id)
   is
      Field_Id : Project_Node_Id := Empty_Node;

   begin
      External_Value :=
        Default_Project_Node
          (Of_Kind       => N_External_Value,
           In_Tree       => In_Tree,
           And_Expr_Kind => Single);
      Set_Location_Of (External_Value, In_Tree, To => Token_Ptr);

      --  The current token is External

      --  Get the left parenthesis

      Scan (In_Tree);
      Expect (Tok_Left_Paren, "`(`");

      --  Scan past the left parenthesis

      if Token = Tok_Left_Paren then
         Scan (In_Tree);
      end if;

      --  Get the name of the external reference

      Expect (Tok_String_Literal, "literal string");

      if Token = Tok_String_Literal then
         Field_Id :=
           Default_Project_Node
             (Of_Kind       => N_Literal_String,
              In_Tree       => In_Tree,
              And_Expr_Kind => Single);
         Set_String_Value_Of (Field_Id, In_Tree, To => Token_Name);
         Set_External_Reference_Of (External_Value, In_Tree, To => Field_Id);

         --  Scan past the first argument

         Scan (In_Tree);

         case Token is

            when Tok_Right_Paren =>

               --  Scan past the right parenthesis
               Scan (In_Tree);

            when Tok_Comma =>

               --  Scan past the comma

               Scan (In_Tree);

               --  Get the string expression for the default

               declare
                  Loc : constant Source_Ptr := Token_Ptr;

               begin
                  Parse_Expression
                    (In_Tree         => In_Tree,
                     Expression      => Field_Id,
                     Current_Project => Current_Project,
                     Current_Package => Current_Package,
                     Optional_Index  => False);

                  if Expression_Kind_Of (Field_Id, In_Tree) = List then
                     Error_Msg ("expression must be a single string", Loc);
                  else
                     Set_External_Default_Of
                       (External_Value, In_Tree, To => Field_Id);
                  end if;
               end;

               Expect (Tok_Right_Paren, "`)`");

               --  Scan past the right parenthesis

               if Token = Tok_Right_Paren then
                  Scan (In_Tree);
               end if;

            when others =>
               Error_Msg ("`,` or `)` expected", Token_Ptr);
         end case;
      end if;
   end External_Reference;

   -----------------------
   -- Parse_Choice_List --
   -----------------------

   procedure Parse_Choice_List
     (In_Tree      : Project_Node_Tree_Ref;
      First_Choice : out Project_Node_Id)
   is
      Current_Choice : Project_Node_Id := Empty_Node;
      Next_Choice    : Project_Node_Id := Empty_Node;
      Choice_String  : Name_Id         := No_Name;
      Found          : Boolean         := False;

   begin
      --  Declare the node of the first choice

      First_Choice :=
        Default_Project_Node
          (Of_Kind       => N_Literal_String,
           In_Tree       => In_Tree,
           And_Expr_Kind => Single);

      --  Initially Current_Choice is the same as First_Choice

      Current_Choice := First_Choice;

      loop
         Expect (Tok_String_Literal, "literal string");
         exit when Token /= Tok_String_Literal;
         Set_Location_Of (Current_Choice, In_Tree, To => Token_Ptr);
         Choice_String := Token_Name;

         --  Give the string value to the current choice

         Set_String_Value_Of (Current_Choice, In_Tree, To => Choice_String);

         --  Check if the label is part of the string type and if it has not
         --  been already used.

         Found := False;
         for Choice in Choice_First .. Choices.Last loop
            if Choices.Table (Choice).The_String = Choice_String then
               --  This label is part of the string type

               Found := True;

               if Choices.Table (Choice).Already_Used then
                  --  But it has already appeared in a choice list for this
                  --  case construction; report an error.

                  Error_Msg_Name_1 := Choice_String;
                  Error_Msg ("duplicate case label {", Token_Ptr);
               else
                  Choices.Table (Choice).Already_Used := True;
               end if;

               exit;
            end if;
         end loop;

         --  If the label is not part of the string list, report an error

         if not Found then
            Error_Msg_Name_1 := Choice_String;
            Error_Msg ("illegal case label {", Token_Ptr);
         end if;

         --  Scan past the label

         Scan (In_Tree);

         --  If there is no '|', we are done

         if Token = Tok_Vertical_Bar then
            --  Otherwise, declare the node of the next choice, link it to
            --  Current_Choice and set Current_Choice to this new node.

            Next_Choice :=
              Default_Project_Node
                (Of_Kind       => N_Literal_String,
                 In_Tree       => In_Tree,
                 And_Expr_Kind => Single);
            Set_Next_Literal_String
              (Current_Choice, In_Tree, To => Next_Choice);
            Current_Choice := Next_Choice;
            Scan (In_Tree);
         else
            exit;
         end if;
      end loop;
   end Parse_Choice_List;

   ----------------------
   -- Parse_Expression --
   ----------------------

   procedure Parse_Expression
     (In_Tree         : Project_Node_Tree_Ref;
      Expression      : out Project_Node_Id;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id;
      Optional_Index  : Boolean)
   is
      First_Term      : Project_Node_Id := Empty_Node;
      Expression_Kind : Variable_Kind := Undefined;

   begin
      --  Declare the node of the expression

      Expression :=
        Default_Project_Node (Of_Kind => N_Expression, In_Tree => In_Tree);
      Set_Location_Of (Expression, In_Tree, To => Token_Ptr);

      --  Parse the term or terms of the expression

      Terms (In_Tree         => In_Tree,
             Term            => First_Term,
             Expr_Kind       => Expression_Kind,
             Current_Project => Current_Project,
             Current_Package => Current_Package,
             Optional_Index  => Optional_Index);

      --  Set the first term and the expression kind

      Set_First_Term (Expression, In_Tree, To => First_Term);
      Set_Expression_Kind_Of (Expression, In_Tree, To => Expression_Kind);
   end Parse_Expression;

   ----------------------------
   -- Parse_String_Type_List --
   ----------------------------

   procedure Parse_String_Type_List
     (In_Tree      : Project_Node_Tree_Ref;
      First_String : out Project_Node_Id)
   is
      Last_String  : Project_Node_Id := Empty_Node;
      Next_String  : Project_Node_Id := Empty_Node;
      String_Value : Name_Id         := No_Name;

   begin
      --  Declare the node of the first string

      First_String :=
        Default_Project_Node
          (Of_Kind       => N_Literal_String,
           In_Tree       => In_Tree,
           And_Expr_Kind => Single);

      --  Initially, Last_String is the same as First_String

      Last_String := First_String;

      loop
         Expect (Tok_String_Literal, "literal string");
         exit when Token /= Tok_String_Literal;
         String_Value := Token_Name;

         --  Give its string value to Last_String

         Set_String_Value_Of (Last_String, In_Tree, To => String_Value);
         Set_Location_Of (Last_String, In_Tree, To => Token_Ptr);

         --  Now, check if the string is already part of the string type

         declare
            Current : Project_Node_Id := First_String;

         begin
            while Current /= Last_String loop
               if String_Value_Of (Current, In_Tree) = String_Value then
                  --  This is a repetition, report an error

                  Error_Msg_Name_1 := String_Value;
                  Error_Msg ("duplicate value { in type", Token_Ptr);
                  exit;
               end if;

               Current := Next_Literal_String (Current, In_Tree);
            end loop;
         end;

         --  Scan past the literal string

         Scan (In_Tree);

         --  If there is no comma following the literal string, we are done

         if Token /= Tok_Comma then
            exit;

         else
            --  Declare the next string, link it to Last_String and set
            --  Last_String to its node.

            Next_String :=
              Default_Project_Node
                (Of_Kind       => N_Literal_String,
                 In_Tree       => In_Tree,
                 And_Expr_Kind => Single);
            Set_Next_Literal_String (Last_String, In_Tree, To => Next_String);
            Last_String := Next_String;
            Scan (In_Tree);
         end if;
      end loop;
   end Parse_String_Type_List;

   ------------------------------
   -- Parse_Variable_Reference --
   ------------------------------

   procedure Parse_Variable_Reference
     (In_Tree         : Project_Node_Tree_Ref;
      Variable        : out Project_Node_Id;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id)
   is
      Current_Variable : Project_Node_Id := Empty_Node;

      The_Package : Project_Node_Id := Current_Package;
      The_Project : Project_Node_Id := Current_Project;

      Specified_Project : Project_Node_Id   := Empty_Node;
      Specified_Package : Project_Node_Id   := Empty_Node;
      Look_For_Variable : Boolean           := True;
      First_Attribute   : Attribute_Node_Id := Empty_Attribute;
      Variable_Name     : Name_Id;

   begin
      Names.Init;

      loop
         Expect (Tok_Identifier, "identifier");

         if Token /= Tok_Identifier then
            Look_For_Variable := False;
            exit;
         end if;

         Add_To_Names (NL => (Name => Token_Name, Location => Token_Ptr));
         Scan (In_Tree);
         exit when Token /= Tok_Dot;
         Scan (In_Tree);
      end loop;

      if Look_For_Variable then

         if Token = Tok_Apostrophe then

            --  Attribute reference

            case Names.Last is
               when 0 =>

                  --  Cannot happen

                  null;

               when 1 =>
                  --  This may be a project name or a package name.
                  --  Project name have precedence.

                  --  First, look if it can be a package name

                  First_Attribute :=
                    First_Attribute_Of
                      (Package_Node_Id_Of (Names.Table (1).Name));

                  --  Now, look if it can be a project name

                  The_Project := Imported_Or_Extended_Project_Of
                    (Current_Project, In_Tree, Names.Table (1).Name);

                  if The_Project = Empty_Node then
                     --  If it is neither a project name nor a package name,
                     --  report an error

                     if First_Attribute = Empty_Attribute then
                        Error_Msg_Name_1 := Names.Table (1).Name;
                        Error_Msg ("unknown project %",
                                   Names.Table (1).Location);
                        First_Attribute := Attribute_First;

                     else
                        --  If it is a package name, check if the package
                        --  has already been declared in the current project.

                        The_Package :=
                          First_Package_Of (Current_Project, In_Tree);

                        while The_Package /= Empty_Node
                          and then Name_Of (The_Package, In_Tree) /=
                          Names.Table (1).Name
                        loop
                           The_Package :=
                             Next_Package_In_Project (The_Package, In_Tree);
                        end loop;

                        --  If it has not been already declared, report an
                        --  error.

                        if The_Package = Empty_Node then
                           Error_Msg_Name_1 := Names.Table (1).Name;
                           Error_Msg ("package % not yet defined",
                                      Names.Table (1).Location);
                        end if;
                     end if;

                  else
                     --  It is a project name

                     First_Attribute := Attribute_First;
                     The_Package     := Empty_Node;
                  end if;

               when others =>

                  --  We have either a project name made of several simple
                  --  names (long project), or a project name (short project)
                  --  followed by a package name. The long project name has
                  --  precedence.

                  declare
                     Short_Project : Name_Id;
                     Long_Project  : Name_Id;

                  begin
                     --  Clear the Buffer

                     Buffer_Last := 0;

                     --  Get the name of the short project

                     for Index in 1 .. Names.Last - 1 loop
                        Add_To_Buffer
                          (Get_Name_String (Names.Table (Index).Name),
                           Buffer, Buffer_Last);

                        if Index /= Names.Last - 1 then
                           Add_To_Buffer (".", Buffer, Buffer_Last);
                        end if;
                     end loop;

                     Name_Len := Buffer_Last;
                     Name_Buffer (1 .. Buffer_Last) :=
                       Buffer (1 .. Buffer_Last);
                     Short_Project := Name_Find;

                     --  Now, add the last simple name to get the name of the
                     --  long project.

                     Add_To_Buffer (".", Buffer, Buffer_Last);
                     Add_To_Buffer
                       (Get_Name_String (Names.Table (Names.Last).Name),
                        Buffer, Buffer_Last);
                     Name_Len := Buffer_Last;
                     Name_Buffer (1 .. Buffer_Last) :=
                       Buffer (1 .. Buffer_Last);
                     Long_Project := Name_Find;

                     --  Check if the long project is imported or extended

                     The_Project := Imported_Or_Extended_Project_Of
                                      (Current_Project, In_Tree, Long_Project);

                     --  If the long project exists, then this is the prefix
                     --  of the attribute.

                     if The_Project /= Empty_Node then
                        First_Attribute := Attribute_First;
                        The_Package     := Empty_Node;

                     else
                        --  Otherwise, check if the short project is imported
                        --  or extended.

                        The_Project := Imported_Or_Extended_Project_Of
                                         (Current_Project, In_Tree,
                                          Short_Project);

                        --  If the short project does not exist, we report an
                        --  error.

                        if The_Project = Empty_Node then
                           Error_Msg_Name_1 := Long_Project;
                           Error_Msg_Name_2 := Short_Project;
                           Error_Msg ("unknown projects % or %",
                                      Names.Table (1).Location);
                           The_Package := Empty_Node;
                           First_Attribute := Attribute_First;

                        else
                           --  Now, we check if the package has been declared
                           --  in this project.

                           The_Package :=
                             First_Package_Of (The_Project, In_Tree);
                           while The_Package /= Empty_Node
                             and then Name_Of (The_Package, In_Tree) /=
                             Names.Table (Names.Last).Name
                           loop
                              The_Package :=
                                Next_Package_In_Project (The_Package, In_Tree);
                           end loop;

                           --  If it has not, then we report an error

                           if The_Package = Empty_Node then
                              Error_Msg_Name_1 :=
                                Names.Table (Names.Last).Name;
                              Error_Msg_Name_2 := Short_Project;
                              Error_Msg ("package % not declared in project %",
                                         Names.Table (Names.Last).Location);
                              First_Attribute := Attribute_First;

                           else
                              --  Otherwise, we have the correct project and
                              --  package.

                              First_Attribute :=
                                First_Attribute_Of
                                  (Package_Id_Of (The_Package, In_Tree));
                           end if;
                        end if;
                     end if;
                  end;
            end case;

            Attribute_Reference
              (In_Tree,
               Variable,
               Current_Project => The_Project,
               Current_Package => The_Package,
               First_Attribute => First_Attribute);
            return;
         end if;
      end if;

      Variable :=
        Default_Project_Node
          (Of_Kind => N_Variable_Reference, In_Tree => In_Tree);

      if Look_For_Variable then
         case Names.Last is
            when 0 =>

               --  Cannot happen

               null;

            when 1 =>

               --  Simple variable name

               Set_Name_Of (Variable, In_Tree, To => Names.Table (1).Name);

            when 2 =>

               --  Variable name with a simple name prefix that can be
               --  a project name or a package name. Project names have
               --  priority over package names.

               Set_Name_Of (Variable, In_Tree, To => Names.Table (2).Name);

               --  Check if it can be a package name

               The_Package := First_Package_Of (Current_Project, In_Tree);

               while The_Package /= Empty_Node
                 and then Name_Of (The_Package, In_Tree) /=
                            Names.Table (1).Name
               loop
                  The_Package :=
                    Next_Package_In_Project (The_Package, In_Tree);
               end loop;

               --  Now look for a possible project name

               The_Project := Imported_Or_Extended_Project_Of
                              (Current_Project, In_Tree, Names.Table (1).Name);

               if The_Project /= Empty_Node then
                  Specified_Project := The_Project;

               elsif The_Package = Empty_Node then
                  Error_Msg_Name_1 := Names.Table (1).Name;
                  Error_Msg ("unknown package or project %",
                             Names.Table (1).Location);
                  Look_For_Variable := False;

               else
                  Specified_Package := The_Package;
               end if;

            when others =>

               --  Variable name with a prefix that is either a project name
               --  made of several simple names, or a project name followed
               --  by a package name.

               Set_Name_Of
                 (Variable, In_Tree, To => Names.Table (Names.Last).Name);

               declare
                  Short_Project : Name_Id;
                  Long_Project  : Name_Id;

               begin
                  --  First, we get the two possible project names

                  --  Clear the buffer

                  Buffer_Last := 0;

                  --  Add all the simple names, except the last two

                  for Index in 1 .. Names.Last - 2 loop
                     Add_To_Buffer
                       (Get_Name_String (Names.Table (Index).Name),
                        Buffer, Buffer_Last);

                     if Index /= Names.Last - 2 then
                        Add_To_Buffer (".", Buffer, Buffer_Last);
                     end if;
                  end loop;

                  Name_Len := Buffer_Last;
                  Name_Buffer (1 .. Name_Len) := Buffer (1 .. Buffer_Last);
                  Short_Project := Name_Find;

                  --  Add the simple name before the name of the variable

                  Add_To_Buffer (".", Buffer, Buffer_Last);
                  Add_To_Buffer
                    (Get_Name_String (Names.Table (Names.Last - 1).Name),
                     Buffer, Buffer_Last);
                  Name_Len := Buffer_Last;
                  Name_Buffer (1 .. Name_Len) := Buffer (1 .. Buffer_Last);
                  Long_Project := Name_Find;

                  --  Check if the prefix is the name of an imported or
                  --  extended project.

                  The_Project := Imported_Or_Extended_Project_Of
                                   (Current_Project, In_Tree, Long_Project);

                  if The_Project /= Empty_Node then
                     Specified_Project := The_Project;

                  else
                     --  Now check if the prefix may be a project name followed
                     --  by a package name.

                     --  First check for a possible project name

                     The_Project := Imported_Or_Extended_Project_Of
                                   (Current_Project, In_Tree, Short_Project);

                     if The_Project = Empty_Node then
                        --  Unknown prefix, report an error

                        Error_Msg_Name_1 := Long_Project;
                        Error_Msg_Name_2 := Short_Project;
                        Error_Msg ("unknown projects % or %",
                                   Names.Table (1).Location);
                        Look_For_Variable := False;

                     else
                        Specified_Project := The_Project;

                        --  Now look for the package in this project

                        The_Package := First_Package_Of (The_Project, In_Tree);

                        while The_Package /= Empty_Node
                          and then Name_Of (The_Package, In_Tree) /=
                                              Names.Table (Names.Last - 1).Name
                        loop
                           The_Package :=
                             Next_Package_In_Project (The_Package, In_Tree);
                        end loop;

                        if The_Package = Empty_Node then
                           --  The package does not vexist, report an error

                           Error_Msg_Name_1 := Names.Table (2).Name;
                           Error_Msg ("unknown package %",
                                   Names.Table (Names.Last - 1).Location);
                           Look_For_Variable := False;

                        else
                           Specified_Package := The_Package;
                        end if;
                     end if;
                  end if;
               end;
         end case;
      end if;

      if Look_For_Variable then
         Variable_Name := Name_Of (Variable, In_Tree);
         Set_Project_Node_Of (Variable, In_Tree, To => Specified_Project);
         Set_Package_Node_Of (Variable, In_Tree, To => Specified_Package);

         if Specified_Project /= Empty_Node then
            The_Project := Specified_Project;

         else
            The_Project := Current_Project;
         end if;

         Current_Variable := Empty_Node;

         --  Look for this variable

         --  If a package was specified, check if the variable has been
         --  declared in this package.

         if Specified_Package /= Empty_Node then
            Current_Variable :=
              First_Variable_Of (Specified_Package, In_Tree);

            while Current_Variable /= Empty_Node
              and then
              Name_Of (Current_Variable, In_Tree) /= Variable_Name
            loop
               Current_Variable := Next_Variable (Current_Variable, In_Tree);
            end loop;

         else
            --  Otherwise, if no project has been specified and we are in
            --  a package, first check if the variable has been declared in
            --  the package.

            if Specified_Project = Empty_Node
              and then Current_Package /= Empty_Node
            then
               Current_Variable :=
                 First_Variable_Of (Current_Package, In_Tree);

               while Current_Variable /= Empty_Node
                 and then Name_Of (Current_Variable, In_Tree) /= Variable_Name
               loop
                  Current_Variable :=
                    Next_Variable (Current_Variable, In_Tree);
               end loop;
            end if;

            --  If we have not found the variable in the package, check if the
            --  variable has been declared in the project.

            if Current_Variable = Empty_Node then
               Current_Variable := First_Variable_Of (The_Project, In_Tree);

               while Current_Variable /= Empty_Node
                 and then Name_Of (Current_Variable, In_Tree) /= Variable_Name
               loop
                  Current_Variable :=
                    Next_Variable (Current_Variable, In_Tree);
               end loop;
            end if;
         end if;

         --  If the variable was not found, report an error

         if Current_Variable = Empty_Node then
            Error_Msg_Name_1 := Variable_Name;
            Error_Msg
              ("unknown variable %", Names.Table (Names.Last).Location);
         end if;
      end if;

      if Current_Variable /= Empty_Node then
         Set_Expression_Kind_Of
           (Variable, In_Tree,
            To => Expression_Kind_Of (Current_Variable, In_Tree));

         if
           Kind_Of (Current_Variable, In_Tree) = N_Typed_Variable_Declaration
         then
            Set_String_Type_Of
              (Variable, In_Tree,
               To => String_Type_Of (Current_Variable, In_Tree));
         end if;
      end if;

      --  If the variable is followed by a left parenthesis, report an error
      --  but attempt to scan the index.

      if Token = Tok_Left_Paren then
         Error_Msg ("\variables cannot be associative arrays", Token_Ptr);
         Scan (In_Tree);
         Expect (Tok_String_Literal, "literal string");

         if Token = Tok_String_Literal then
            Scan (In_Tree);
            Expect (Tok_Right_Paren, "`)`");

            if Token = Tok_Right_Paren then
               Scan (In_Tree);
            end if;
         end if;
      end if;
   end Parse_Variable_Reference;

   ---------------------------------
   -- Start_New_Case_Construction --
   ---------------------------------

   procedure Start_New_Case_Construction
     (In_Tree      : Project_Node_Tree_Ref;
      String_Type  : Project_Node_Id)
   is
      Current_String : Project_Node_Id;

   begin
      --  Set Choice_First, depending on whether is the first case
      --  construction or not.

      if Choice_First = 0 then
         Choice_First := 1;
         Choices.Set_Last (First_Choice_Node_Id);
      else
         Choice_First := Choices.Last + 1;
      end if;

      --  Add to table Choices the literal of the string type

      if String_Type /= Empty_Node then
         Current_String := First_Literal_String (String_Type, In_Tree);

         while Current_String /= Empty_Node loop
            Add (This_String => String_Value_Of (Current_String, In_Tree));
            Current_String := Next_Literal_String (Current_String, In_Tree);
         end loop;
      end if;

      --  Set the value of the last choice in table Choice_Lasts

      Choice_Lasts.Increment_Last;
      Choice_Lasts.Table (Choice_Lasts.Last) := Choices.Last;

   end Start_New_Case_Construction;

   -----------
   -- Terms --
   -----------

   procedure Terms
     (In_Tree         : Project_Node_Tree_Ref;
      Term            : out Project_Node_Id;
      Expr_Kind       : in out Variable_Kind;
      Current_Project : Project_Node_Id;
      Current_Package : Project_Node_Id;
      Optional_Index  : Boolean)
   is
      Next_Term          : Project_Node_Id := Empty_Node;
      Term_Id            : Project_Node_Id := Empty_Node;
      Current_Expression : Project_Node_Id := Empty_Node;
      Next_Expression    : Project_Node_Id := Empty_Node;
      Current_Location   : Source_Ptr      := No_Location;
      Reference          : Project_Node_Id := Empty_Node;

   begin
      --  Declare a new node for the term

      Term := Default_Project_Node (Of_Kind => N_Term, In_Tree => In_Tree);
      Set_Location_Of (Term, In_Tree, To => Token_Ptr);

      case Token is
         when Tok_Left_Paren =>

            --  If we have a left parenthesis and we don't know the expression
            --  kind, then this is a string list.

            case Expr_Kind is
               when Undefined =>
                  Expr_Kind := List;

               when List =>
                  null;

               when Single =>

                  --  If we already know that this is a single string, report
                  --  an error, but set the expression kind to string list to
                  --  avoid several errors.

                  Expr_Kind := List;
                  Error_Msg
                    ("literal string list cannot appear in a string",
                     Token_Ptr);
            end case;

            --  Declare a new node for this literal string list

            Term_Id := Default_Project_Node
              (Of_Kind       => N_Literal_String_List,
               In_Tree       => In_Tree,
               And_Expr_Kind => List);
            Set_Current_Term (Term, In_Tree, To => Term_Id);
            Set_Location_Of  (Term, In_Tree, To => Token_Ptr);

            --  Scan past the left parenthesis

            Scan (In_Tree);

            --  If the left parenthesis is immediately followed by a right
            --  parenthesis, the literal string list is empty.

            if Token = Tok_Right_Paren then
               Scan (In_Tree);

            else
               --  Otherwise, we parse the expression(s) in the literal string
               --  list.

               loop
                  Current_Location := Token_Ptr;
                  Parse_Expression
                    (In_Tree         => In_Tree,
                     Expression      => Next_Expression,
                     Current_Project => Current_Project,
                     Current_Package => Current_Package,
                     Optional_Index  => Optional_Index);

                  --  The expression kind is String list, report an error

                  if Expression_Kind_Of (Next_Expression, In_Tree) = List then
                     Error_Msg ("single expression expected",
                                Current_Location);
                  end if;

                  --  If Current_Expression is empty, it means that the
                  --  expression is the first in the string list.

                  if Current_Expression = Empty_Node then
                     Set_First_Expression_In_List
                       (Term_Id, In_Tree, To => Next_Expression);
                  else
                     Set_Next_Expression_In_List
                       (Current_Expression, In_Tree, To => Next_Expression);
                  end if;

                  Current_Expression := Next_Expression;

                  --  If there is a comma, continue with the next expression

                  exit when Token /= Tok_Comma;
                  Scan (In_Tree); -- past the comma
               end loop;

               --  We expect a closing right parenthesis

               Expect (Tok_Right_Paren, "`)`");

               if Token = Tok_Right_Paren then
                  Scan (In_Tree);
               end if;
            end if;

         when Tok_String_Literal =>

            --  If we don't know the expression kind (first term), then it is
            --  a simple string.

            if Expr_Kind = Undefined then
               Expr_Kind := Single;
            end if;

            --  Declare a new node for the string literal

            Term_Id :=
              Default_Project_Node
                (Of_Kind => N_Literal_String, In_Tree => In_Tree);
            Set_Current_Term (Term, In_Tree, To => Term_Id);
            Set_String_Value_Of (Term_Id, In_Tree, To => Token_Name);

            --  Scan past the string literal

            Scan (In_Tree);

            --  Check for possible index expression

            if Token = Tok_At then
               if not Optional_Index then
                  Error_Msg ("index not allowed here", Token_Ptr);
                  Scan (In_Tree);

                  if Token = Tok_Integer_Literal then
                     Scan (In_Tree);
                  end if;

               --  Set the index value

               else
                  Scan (In_Tree);
                  Expect (Tok_Integer_Literal, "integer literal");

                  if Token = Tok_Integer_Literal then
                     declare
                        Index : constant Int := UI_To_Int (Int_Literal_Value);
                     begin
                        if Index = 0 then
                           Error_Msg ("index cannot be zero", Token_Ptr);
                        else
                           Set_Source_Index_Of
                             (Term_Id, In_Tree, To => Index);
                        end if;
                     end;

                     Scan (In_Tree);
                  end if;
               end if;
            end if;

         when Tok_Identifier =>
            Current_Location := Token_Ptr;

            --  Get the variable or attribute reference

            Parse_Variable_Reference
              (In_Tree         => In_Tree,
               Variable        => Reference,
               Current_Project => Current_Project,
               Current_Package => Current_Package);
            Set_Current_Term (Term, In_Tree, To => Reference);

            if Reference /= Empty_Node then

               --  If we don't know the expression kind (first term), then it
               --  has the kind of the variable or attribute reference.

               if Expr_Kind = Undefined then
                  Expr_Kind := Expression_Kind_Of (Reference, In_Tree);

               elsif Expr_Kind = Single
                 and then Expression_Kind_Of (Reference, In_Tree) = List
               then
                  --  If the expression is a single list, and the reference is
                  --  a string list, report an error, and set the expression
                  --  kind to string list to avoid multiple errors.

                  Expr_Kind := List;
                  Error_Msg
                    ("list variable cannot appear in single string expression",
                     Current_Location);
               end if;
            end if;

         when Tok_Project =>

            --  project can appear in an expression as the prefix of an
            --  attribute reference of the current project.

            Current_Location := Token_Ptr;
            Scan (In_Tree);
            Expect (Tok_Apostrophe, "`'`");

            if Token = Tok_Apostrophe then
               Attribute_Reference
                 (In_Tree         => In_Tree,
                  Reference       => Reference,
                  First_Attribute => Prj.Attr.Attribute_First,
                  Current_Project => Current_Project,
                  Current_Package => Empty_Node);
               Set_Current_Term (Term, In_Tree, To => Reference);
            end if;

            --  Same checks as above for the expression kind

            if Reference /= Empty_Node then
               if Expr_Kind = Undefined then
                  Expr_Kind := Expression_Kind_Of (Reference, In_Tree);

               elsif Expr_Kind = Single
                 and then Expression_Kind_Of (Reference, In_Tree) = List
               then
                  Error_Msg
                    ("lists cannot appear in single string expression",
                     Current_Location);
               end if;
            end if;

         when Tok_External =>
            --  An external reference is always a single string

            if Expr_Kind = Undefined then
               Expr_Kind := Single;
            end if;

            External_Reference
              (In_Tree         => In_Tree,
               Current_Project => Current_Project,
               Current_Package => Current_Package,
               External_Value  => Reference);
            Set_Current_Term (Term, In_Tree, To => Reference);

         when others =>
            Error_Msg ("cannot be part of an expression", Token_Ptr);
            Term := Empty_Node;
            return;
      end case;

      --  If there is an '&', call Terms recursively

      if Token = Tok_Ampersand then

         --  Scan past the '&'

         Scan (In_Tree);

         Terms
           (In_Tree         => In_Tree,
            Term            => Next_Term,
            Expr_Kind       => Expr_Kind,
            Current_Project => Current_Project,
            Current_Package => Current_Package,
            Optional_Index  => Optional_Index);

         --  And link the next term to this term

         Set_Next_Term (Term, In_Tree, To => Next_Term);
      end if;
   end Terms;

end Prj.Strt;