File: grammar.c

package info (click to toggle)
pgn-extract 16.0-1
  • links: PTS
  • area: main
  • in suites: etch, etch-m68k, lenny
  • size: 912 kB
  • ctags: 737
  • sloc: ansic: 8,857; makefile: 103
file content (955 lines) | stat: -rw-r--r-- 25,123 bytes parent folder | download
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
/*
 *  Program: pgn-extract: a Portable Game Notation (PGN) extractor.
 *  Copyright (C) 1994-2005 David Barnes
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 1, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT 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
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  David Barnes may be contacted as D.J.Barnes@kent.ac.uk
 *  http://www.cs.kent.ac.uk/people/staff/djb/
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "bool.h"
#include "mymalloc.h"
#include "defs.h"
#include "typedef.h"
#include "tokens.h"
#include "taglist.h"
#include "lex.h"
#include "moves.h"
#include "map.h"
#include "lists.h"
#include "apply.h"
#include "output.h"
#include "eco.h"
#include "end.h"
#include "grammar.h"
#include "hashing.h"

static TokenType Symbol = NO_TOKEN;
int yyparse(SourceFileType file_type);
/* Keep track of which RAV level we are at. This is used to
 * check whether a TERMINATING_RESULT is the final one.
 */
static unsigned RAV_level = 0;

/* Retain details of the header of a game.
 * This comprises the Tags and any comment prefixing the
 * moves of the game.
 */
static struct{
    /* The tag values. */
    char **Tags;
    int header_tags_length;
    CommentList *prefix_comment;
} Game_Header;

static void ParseOptGameList(SourceFileType file_type);
static Boolean ParseGame(Move **returned_move_list);
Boolean ParseOptTagList(void);
Boolean ParseTag(void);
static Move *ParseMoveList(void);
static Move *ParseMoveAndVariants(void);
static Move *ParseMove(void);
static Move *ParseMoveUnit(void);
static CommentList *ParseOptCommentList(void);
Boolean ParseOptMoveNumber(void);
static StringList *ParseOptNAGList(void);
static Variation *ParseOptVariantList(void);
static Variation *ParseVariant(void);
static char *ParseResult(void);

static void setup_for_new_game(void);
static void append_comments_to_move(Move *move,CommentList *Comment);
void free_tags(void);
static void check_result(char **Tags,const char *terminating_result);
static void free_comment_list(CommentList *comment_list);
static void DealWithEcoLine(Move *move_list);

    /* Initialise the game header structure to contain
     * space for the default number of tags.
     * The space will have to be increased if new tags are
     * identified in the program source.
     */
void
init_game_header(void)
{
    int i;
    Game_Header.header_tags_length = ORIGINAL_NUMBER_OF_TAGS;
    Game_Header.Tags = (char **) MallocOrDie(Game_Header.header_tags_length*
		    sizeof(*Game_Header.Tags));
    for(i = 0; i < Game_Header.header_tags_length; i++){
        Game_Header.Tags[i] = (char *) NULL;
    }
}

void increase_game_header_tags_length(int new_length)
{   int i;

    if(new_length < 0 || new_length <= Game_Header.header_tags_length){
        fprintf(GlobalState.logfile,
	        "Internal error: inappropriate length %d ",new_length);
        fprintf(GlobalState.logfile,
		" passed to increase_game_header_tags().\n");
        exit(1);
    }
    Game_Header.Tags = (char **) ReallocOrDie((void *) Game_Header.Tags,
				      new_length*sizeof(*Game_Header.Tags));
    for(i = Game_Header.header_tags_length; i < new_length; i++){
        Game_Header.Tags[i] = NULL;
    }
    Game_Header.header_tags_length = new_length;
}

	/* Try to open the given file. Error and exit on failure. */
FILE *
MustOpen(const char *filename,const char *mode)
{   FILE *fp;

    fp = fopen(filename,mode);
    if(fp == NULL){
	fprintf(GlobalState.logfile,"Unable to open the file: \"%s\"\n",
	        filename);
	exit(1);
    }
    return fp;
}

	/* Print out on outfp the current details and
	 * terminate with a newline.
	 */
void
report_details(FILE *outfp)
{
      if(Game_Header.Tags[WHITE_TAG] != NULL){
	  fprintf(outfp,"%s - ",Game_Header.Tags[WHITE_TAG]);
      }
      if(Game_Header.Tags[BLACK_TAG] != NULL){
	  fprintf(outfp,"%s ",Game_Header.Tags[BLACK_TAG]);
      }

      if(Game_Header.Tags[EVENT_TAG] != NULL){
	  fprintf(outfp,"%s ",Game_Header.Tags[EVENT_TAG]);
      }
      if(Game_Header.Tags[SITE_TAG] != NULL){
	  fprintf(outfp,"%s ",Game_Header.Tags[SITE_TAG]);
      }

      if(Game_Header.Tags[DATE_TAG] != NULL){
	  fprintf(outfp,"%s ",Game_Header.Tags[DATE_TAG]);
      }
      putc('\n',outfp);
      fflush(outfp);
}

	/* Check that terminating_result is consistent with
	 * Tags[RESULT_TAG].  If the latter is missing, fill it
	 * in from terminating_result.
	 */
static void
check_result(char **Tags,const char *terminating_result)
{   char *result_tag = Tags[RESULT_TAG];

    if(terminating_result != NULL){
	if((result_tag == NULL) || (*result_tag == '\0') ||
		    (strcmp(result_tag,"?") == 0)){
	    /* Use a copy of terminating result. */
	    result_tag = StringCopy(terminating_result);
	    Tags[RESULT_TAG] = result_tag;
	}
	else if((result_tag != NULL) &&
			(strcmp(result_tag,terminating_result) != 0)){
	    fprintf(GlobalState.logfile,
			"Inconsistent result strings in the following game.\n");
	    report_details(GlobalState.logfile);
	    print_error_context(GlobalState.logfile);
	}
	else{
	    /* Ok. */
	}
    }
}

	/* Select which file to write to based upon the game state.
	 * This will depend upon:
	 *	Whether the number of games per file is limited.
	 *	Whether ECO_level > DONT_DIVIDE.
	 */

static FILE *
select_output_file(StateInfo *GameState,const char *eco)
{   
    if(GameState->games_per_file > 0){
	if((GameState->num_games_matched % GameState->games_per_file) == 0){
	      /* Time to open the next one. */
	      char filename[50];

	      if(GameState->outputfile != NULL){
		  (void) fclose(GameState->outputfile);
	      }
	      sprintf(filename,"%u%s",
			GameState->next_file_number,
			output_file_suffix(GameState->output_format));
	      GameState->outputfile = MustOpen(filename,"w");
	      GameState->next_file_number++;
	}
    }
    else if(GameState->ECO_level > DONT_DIVIDE){
	/* Open a file of the appropriate name. */
	if(GameState->outputfile != NULL){
	    /* @@@ In practice, this might need refinement.
	     * Repeated opening and closing may prove inefficient.
	     */
	    (void) fclose(GameState->outputfile);
	    GameState->outputfile = open_eco_output_file(
				GameState->ECO_level,
				eco);
	}
    }
    else{
    }
    return GameState->outputfile;
}

static void
ParseOptGameList(SourceFileType file_type)
{   Move *move_list = NULL;

    while(ParseGame(&move_list)){
	if(file_type == NORMALFILE){
	    DealWithGame(move_list);
	}
	else if(file_type == CHECKFILE){
	    DealWithGame(move_list);
	}
	else if(file_type == ECOFILE){
	    if(move_list != NULL){
		DealWithEcoLine(move_list);
	    }
	    else {
		fprintf(GlobalState.logfile,"ECO line with zero moves.\n");
		report_details(GlobalState.logfile);
	    }
	}
	else{
	    /* Unknown type. */
	    free_tags();
	    free_move_list(move_list);
	}
	move_list = NULL;
	setup_for_new_game();
    }
}

	/* Parse a game and return a pointer to any valid list of moves
	 * in returned_move_list.
	 */
static Boolean
ParseGame(Move **returned_move_list)
{   Boolean something_found = FALSE;
    CommentList *prefix_comment;
    Move *move_list = NULL;
    char *result;

    /* Assume that we won't return anything. */
    *returned_move_list = NULL;
    /* Skip over any junk between games. */
    Symbol = skip_to_next_game(Symbol);
    prefix_comment = ParseOptCommentList();
    if(prefix_comment != NULL){
	/* Free this here, as it is hard to
	 * know whether it belongs to the game or the file.
	 * It is better to put game comments after the tags.
	 */
	something_found = TRUE;
	free_comment_list(prefix_comment);
	prefix_comment = NULL;
    }
    if(ParseOptTagList()){
	something_found = TRUE;
    }
    /* @@@ Beware of comments and/or tags without moves. */
    move_list = ParseMoveList();
    /* Look for a result, even if there were no moves. */
    result = ParseResult();
    if(move_list != NULL){
	if(result != NULL){
	    /* Append it to the last move. */
	    Move *last_move= move_list;

	    while(last_move->next != NULL){
		last_move = last_move->next;
	    }
	    last_move->terminating_result = result;
	    check_result(Game_Header.Tags,result);
	    *returned_move_list = move_list;
	}
	else{
	    fprintf(GlobalState.logfile,"Missing result.\n");
	    report_details(GlobalState.logfile);
	}
	something_found = TRUE;
    }
    else{
	/*
	 * Workaround for games with zero moves.
	 * Check the result for consistency with the tags, but then
	 * there is no move to attach it to.
	 * When outputting a game, the missing result in this case
	 * will have to be supplied from the tags.
	 */
	check_result(Game_Header.Tags,result);
	if(result != NULL){
	    (void) free((void *)result);
	}
	*returned_move_list = NULL;
    }
    return Symbol != EOF_TOKEN;
}

Boolean
ParseOptTagList(void)
{   Boolean something_found = FALSE;
    CommentList *prefix_comment;
 
    while(ParseTag()){
	something_found = TRUE;
    }
    if(something_found){
	/* Perform any consistency checks. */
	if((Game_Header.Tags[SETUP_TAG] != NULL) &&
		(strcmp(Game_Header.Tags[SETUP_TAG],"1") == 0)){
	    /* There must be a FEN_TAG to go with it. */
	    if(Game_Header.Tags[FEN_TAG] == NULL){
		 fprintf(GlobalState.logfile,
			"Missing %s Tag to accompany %s Tag.\n",
			tag_header_string(FEN_TAG),
			tag_header_string(SETUP_TAG));
	    }
	}
    }
    prefix_comment = ParseOptCommentList();
    if(prefix_comment != NULL){
	Game_Header.prefix_comment = prefix_comment;
	something_found = TRUE;
    }
    return something_found;
}

Boolean
ParseTag(void)
{   Boolean TagFound = TRUE;

    if(Symbol == TAG){
	TagName tag_index = yylval.tag_index;

	Symbol = next_token();
	if(Symbol == STRING){
	    char *tag_string = yylval.token_string;

	    if(tag_index < Game_Header.header_tags_length){
	        Game_Header.Tags[tag_index] = tag_string;
	    }
	    else{
		print_error_context(GlobalState.logfile);
	        fprintf(GlobalState.logfile,
			"Internal error: Illegal tag index %d for %s\n",
			tag_index,tag_string);
		exit(1);
	    }
	    Symbol = next_token();
	}
	else{
	    print_error_context(GlobalState.logfile);
	    fprintf(GlobalState.logfile,"Missing tag string.\n");
	}
    }
    else if(Symbol == STRING){
	print_error_context(GlobalState.logfile);
	fprintf(GlobalState.logfile,"Missing tag for %s.\n",yylval.token_string);
	(void) free((void *)yylval.token_string);
	Symbol = next_token();
    }
    else{
	TagFound = FALSE;
    }
    return TagFound;
}


static Move *
ParseMoveList(void)
{   Move *head = NULL, *tail = NULL;

    head = ParseMoveAndVariants();
    if(head != NULL){
	Move *next_move;

	tail = head;
	while((next_move = ParseMoveAndVariants()) != NULL){
	    tail->next = next_move;
	    tail = next_move;
	}
    }
    return head;
}

static Move *
ParseMoveAndVariants(void)
{   Move *move_details;

    move_details = ParseMove();
    if(move_details != NULL){
	CommentList *comment;

	move_details->Variants = ParseOptVariantList();
	comment = ParseOptCommentList();
	if(comment != NULL){
	    append_comments_to_move(move_details,comment);
	}
    }
    return move_details;
}


static Move *
ParseMove(void)
{   Move *move_details = NULL;

    if(ParseOptMoveNumber()){
    }
    /* @@@ Watch out for finding just the number. */
    move_details = ParseMoveUnit();
    if(move_details != NULL){
	CommentList *comment;

	move_details->Nags = ParseOptNAGList();
	comment = ParseOptCommentList();
	if(comment != NULL){
	    append_comments_to_move(move_details,comment);
	}
    }
    return move_details;
}

static Move *
ParseMoveUnit(void)
{   Move *move_details = NULL;

    if(Symbol == MOVE){
	move_details = yylval.move_details;

	Symbol = next_token();
	if(Symbol == CHECK_SYMBOL){
	    strcat((char *) move_details->move,"+");
	    Symbol = next_token();
	    /* Sometimes + is followed by #, so cover this case. */
	    if(Symbol == CHECK_SYMBOL){
		Symbol = next_token();
	    }
	}
	move_details->Comment = ParseOptCommentList();
    }
    return move_details;
}

static CommentList *
ParseOptCommentList(void)
{   CommentList *head = NULL, *tail = NULL;

    while(Symbol == COMMENT){
	if(head == NULL){
	    head = tail = yylval.comment;
	}
	else{
	    tail->next = yylval.comment;
	    tail = tail->next;
	}
	Symbol = next_token();
    }
    return head;
}

Boolean
ParseOptMoveNumber(void)
{   Boolean something_found = FALSE;

    if(Symbol == MOVE_NUMBER){
	Symbol = next_token();
	something_found = TRUE;
    }
    return something_found;
}

static StringList *
ParseOptNAGList(void)
{   StringList *nags = NULL;
 
    while(Symbol == NAG){
	if(GlobalState.keep_NAGs){
	    nags = SaveStringListItem(nags,yylval.token_string);
	}
        else{
	    (void) free((void *)yylval.token_string);
	}
	Symbol = next_token();
    }
    return nags;
}

static Variation *
ParseOptVariantList(void)
{   Variation *head = NULL, *tail = NULL,
	*variation;
 
    while((variation = ParseVariant()) != NULL){
	if(head == NULL){
	    head = tail = variation;
	}
	else{
	    tail->next = variation;
	    tail = variation;
	}
    }
    return head;
}

static Variation *
ParseVariant(void)
{   Variation *variation = NULL;

    if(Symbol == RAV_START){
	CommentList *prefix_comment;
	CommentList *suffix_comment;
	char *result = NULL;
	Move *moves;

	RAV_level++;
	variation = MallocOrDie(sizeof(Variation));

	Symbol = next_token();
	prefix_comment = ParseOptCommentList();
	if(prefix_comment != NULL){
	}
	moves = ParseMoveList();
	if(moves == NULL){
	    fprintf(GlobalState.logfile,"Missing move list in variation.\n");
	    print_error_context(GlobalState.logfile);
	}
	result = ParseResult();
	if((result != NULL) && (moves != NULL)){
	    /* Find the last move, to which to append the terminating
	     * result.
	     */
	    Move *last_move = moves;
	    CommentList *trailing_comment;

	    while(last_move->next != NULL){
		last_move = last_move->next;
	    }
	    last_move->terminating_result = result;
	    /* Accept a comment after the result, but it will
	     * be printed out preceding the result.
	     */
	    trailing_comment = ParseOptCommentList();
	    if(trailing_comment != NULL){
		append_comments_to_move(last_move,trailing_comment);
	    }
	}
	else{
	    /* Ok. */
	}
	if(Symbol == RAV_END){
	    RAV_level--;
	    Symbol = next_token();
	}
	else{
	    fprintf(GlobalState.logfile,"Missing ')' to close variation.\n");
	}
	suffix_comment = ParseOptCommentList();
	if(suffix_comment != NULL){
	}
	variation->prefix_comment = prefix_comment;
	variation->suffix_comment = suffix_comment;
	variation->moves = moves;
	variation->next = NULL;
    }
    return variation;
}

static char *
ParseResult(void)
{   char *result = NULL;

    if(Symbol == TERMINATING_RESULT){
	result = yylval.token_string;
	if(RAV_level == 0){
	    /* In the interests of skipping any intervening material
	     * between games, set the lookahead to a dummy token.
	     */
	    Symbol = NO_TOKEN;
	}
	else{
	    Symbol = next_token();
	}
    }
    return result;
}

static void
setup_for_new_game(void)
{
    restart_lex_for_new_game();
    RAV_level = 0;
}

	/* Discard any data held in the Game_Header.Tags structure. */
void
free_tags(void)
{ int tag;

  for(tag = 0; tag < Game_Header.header_tags_length; tag++){
      if(Game_Header.Tags[tag] != NULL){
	  free(Game_Header.Tags[tag]);
	  Game_Header.Tags[tag] = NULL;
      }
  }
}

	/* Discard data from a gathered game. */
void
free_string_list(StringList *list)
{   StringList *next;

    while(list != NULL){
	next = list;
	list = list->next;
	if(next->str != NULL){
	    (void) free((void *)next->str);
	}
	(void) free((void *)next);
    }
}

static void
free_comment_list(CommentList *comment_list)
{
    while(comment_list != NULL){
	CommentList *this_comment = comment_list;

	if(comment_list->Comment != NULL){
	    free_string_list(comment_list->Comment);
	}
	comment_list = comment_list->next;
	(void) free((void *)this_comment);
    }
}

static void
free_variation(Variation *variation)
{   Variation *next;

    while(variation != NULL){
	next = variation;
	variation = variation->next;
	if(next->prefix_comment != NULL){
	    free_comment_list(next->prefix_comment);
	}
	if(next->suffix_comment != NULL){
	    free_comment_list(next->suffix_comment);
	}
	if(next->moves != NULL){
	    (void) free_move_list((void *)next->moves);
	}
	(void) free((void *)next);
    }
}

void
free_move_list(Move *move_list)
{   Move *next;

    while(move_list != NULL){
	next = move_list;
	move_list = move_list->next;
	if(next->Nags != NULL){
	    free_string_list(next->Nags);
	}
	if(next->Comment != NULL){
	    free_comment_list(next->Comment);
	}
	if(next->Variants != NULL){
	    free_variation(next->Variants);
	}
	if(next->epd != NULL){
	    (void) free((void *)next->epd);
	}
	if(next->terminating_result != NULL){
	    (void) free((void *)next->terminating_result);
	}
	(void) free((void *)next);
    }
}

	/* Add str onto the tail of list and
	 * return the head of the resulting list.
	 */
StringList *
SaveStringListItem(StringList *list,char *str)
{
    if(str != NULL){
      StringList *new_item;

      new_item = (StringList *)MallocOrDie(sizeof(*new_item));
      new_item->str = str;
      new_item->next = NULL;
      if(list == NULL){
	  list = new_item;
      }
      else{
	  StringList *tail = list;

	  while(tail->next != NULL){
	      tail = tail->next;
	  }
	  tail->next = new_item;
      }
    }
    return list;
}

	/* Append any comments in Comment onto the end of
	 * any associated with move.
	 */
static void
append_comments_to_move(Move *move,CommentList *Comment)
{
    if(Comment != NULL){
	/* Add in to the end of any already existing. */
	if(move->Comment == NULL){
	    move->Comment = Comment;
	}
	else{
	    /* Add in the final comment to 
	     * the end of any existing for this move.
	     */
	    CommentList *tail = move->Comment;

	    while(tail->next != NULL){
		tail = tail->next;
	    }
	    tail->next = Comment;
	}
    }
}

void
DealWithGame(Move *move_list)
{   Game current_game;
    /* Record whether the game has been printed or not.
     * This is used for the case of the -n flag which catches
     * all non-printed games.
     */
    Boolean game_output = FALSE;
    /* We need a dummy argument for apply_move_list. */
    unsigned number_of_moves;

    /* Update the count of how many games handled. */
    GlobalState.num_games_processed++;

    /* Fill in the information currently known. */
    current_game.tags = Game_Header.Tags;
    current_game.tags_length = Game_Header.header_tags_length;
    current_game.prefix_comment = Game_Header.prefix_comment;
    current_game.moves = move_list;
    current_game.moves_checked = FALSE;
    current_game.moves_ok = FALSE;
  
    /* Determine whether or not this game is wanted, on the
     * basis of the various selection criteria available.
     */
    
    /*
     * apply_move_list checks out the moves.
     * If it returns TRUE as a match, it will also fill in the
     * 		current_game.final_hash_value and
     * 		current_game.cumulative_hash_value
     * fields of current_game so that these can be used in the
     * previous_occurance function.
     *
     * If there are any tag criteria, it will be easy to quickly
     * eliminate most games without going through the length
     * process of game matching.
     *
     * If ECO adding is done, the order of checking may cause
     * a conflict here since it won't be possible to reject a game
     * based on its ECO code unless it already has one.
     * Therefore, Check for the ECO tag only after everything else has
     * been checked.
     */
    if(CheckTagDetailsNotECO(current_game.tags,current_game.tags_length) &&
	     apply_move_list(&current_game,&number_of_moves) && 
	     check_move_bounds(number_of_moves) &&
  	     check_textual_variations(current_game) &&
	     check_for_ending(current_game.moves) &&
	     CheckECOTag(current_game.tags)){
	/* If there is no original filename then the game is not a
	 * duplicate.
	 */
        const char *original_filename = previous_occurance(current_game);

        if((original_filename == NULL) && GlobalState.suppress_originals){
  	  /* Don't output first occurrences. */
        }
        else if((original_filename == NULL) || !GlobalState.suppress_duplicates){
  	  if(!GlobalState.check_only &&
			(GlobalState.current_file_type != CHECKFILE)){
  	      /* This game is to be kept and output. */
  	      FILE *outputfile = select_output_file(&GlobalState,
			current_game.tags[ECO_TAG]);

  	      /* See if we wish to separate out duplicates. */
  	      if((original_filename != NULL) &&
			(GlobalState.duplicate_file != NULL)){
  		  static const char *last_input_file = NULL;
  
  		  outputfile = GlobalState.duplicate_file;
  		  if((last_input_file != GlobalState.current_input_file) &&
  		     (GlobalState.current_input_file != NULL)){
  			 /* Record which file this and succeeding
  			  * duplicates come from.
  			  */
  			print_str(outputfile,"{ From: ");
  			print_str(outputfile,
  				    GlobalState.current_input_file);
  			print_str(outputfile," }");
  			terminate_line(outputfile);
  			last_input_file = GlobalState.current_input_file;
  		  }
		  print_str(outputfile,"{ First found in: ");
		  print_str(outputfile,original_filename);
		  print_str(outputfile," }");
		  terminate_line(outputfile);
  	      }
	      /* Now output what we have. */
	      output_game(current_game,outputfile);
	      game_output = TRUE;
  	  }
	  if(GlobalState.current_file_type == CHECKFILE){
	      /* Don't do anything else, but count this as a game output,
	       * so that it doesn't get caught by the non_matching_file
	       * option.
	       */
	      game_output = TRUE;
	  }
	  else{
	      /* Update the number of matched games. */
	      GlobalState.num_games_matched++;
	      if(GlobalState.verbose){
		  /* Report progress on logfile. */
		  report_details(GlobalState.logfile);
	      }
	  }
        }
    }
    if(!game_output && (GlobalState.non_matching_file != NULL)){
	/* The user wants to keep everything else. */
	if(!current_game.moves_checked){
	     /* Make sure that the move text is in a reasonable state. */
	     (void) apply_move_list(&current_game,&number_of_moves);
	}
	if(current_game.moves_ok){
	    output_game(current_game,GlobalState.non_matching_file);
	}
    }
  
    /* Game is finished with, so free everything. */
    if(Game_Header.prefix_comment != NULL){
        free_comment_list(Game_Header.prefix_comment);
    }
    /* Ensure that the Game_Header's prefix comment is NULL for
     * the next game.
     */
    Game_Header.prefix_comment = NULL;
  
    free_tags();
    free_move_list(current_game.moves);
    if((GlobalState.num_games_processed % 10) == 0){
	fprintf(stderr,"Games: %lu\r",GlobalState.num_games_processed);
    }
}

static void
DealWithEcoLine(Move *move_list)
{   Game current_game;
    /* We need to know the length of a game to store with the
     * hash information as a sanity check.
     */
    unsigned number_of_half_moves;

    /* Fill in the information currently known. */
    current_game.tags = Game_Header.Tags;
    current_game.tags_length = Game_Header.header_tags_length;
    current_game.prefix_comment = Game_Header.prefix_comment;
    current_game.moves = move_list;
    current_game.moves_checked = FALSE;
    current_game.moves_ok = FALSE;
  
    /* apply_eco_move_list checks out the moves.
     * It will also fill in the
     * 		current_game.final_hash_value and
     * 		current_game.cumulative_hash_value
     * fields of current_game.
     */
    if(apply_eco_move_list(&current_game,&number_of_half_moves)){
	if(current_game.moves_ok){
	    /* Store the ECO code in the appropriate hash location. */
	    save_eco_details(current_game,number_of_half_moves);
	}
    }
  
    /* Game is finished with, so free everything. */
    if(Game_Header.prefix_comment != NULL){
        free_comment_list(Game_Header.prefix_comment);
    }
    /* Ensure that the Game_Header's prefix comment is NULL for
     * the next game.
     */
    Game_Header.prefix_comment = NULL;
  
    free_tags();
    free_move_list(current_game.moves);
}
	/* If file_type == ECOFILE we are dealing with a file of ECO
	 * input rather than a normal game file.
	 */
int
yyparse(SourceFileType file_type)
{
    setup_for_new_game();
    Symbol = skip_to_next_game(NO_TOKEN);
    ParseOptGameList(file_type);
    if(Symbol == EOF_TOKEN){
	/* Ok -- EOF. */
	return 0;
    }
    else{
	fprintf(GlobalState.logfile,"End of input reached before end of file.\n");
	return 1;
    }
}