9 * parser.l -- lex parser of algebraic chess moves for XBoard
11 * Copyright 1991 by Digital Equipment Corporation, Maynard,
14 * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005,
15 * 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
17 * The following terms apply to Digital Equipment Corporation's copyright
19 * ------------------------------------------------------------------------
22 * Permission to use, copy, modify, and distribute this software and its
23 * documentation for any purpose and without fee is hereby granted,
24 * provided that the above copyright notice appear in all copies and that
25 * both that copyright notice and this permission notice appear in
26 * supporting documentation, and that the name of Digital not be
27 * used in advertising or publicity pertaining to distribution of the
28 * software without specific, written prior permission.
30 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
31 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
32 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
33 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
34 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
35 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
37 * ------------------------------------------------------------------------
39 * The following terms apply to the enhanced version of XBoard
40 * distributed by the Free Software Foundation:
41 * ------------------------------------------------------------------------
43 * GNU XBoard is free software: you can redistribute it and/or modify
44 * it under the terms of the GNU General Public License as published by
45 * the Free Software Foundation, either version 3 of the License, or (at
46 * your option) any later version.
48 * GNU XBoard is distributed in the hope that it will be useful, but
49 * WITHOUT ANY WARRANTY; without even the implied warranty of
50 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
51 * General Public License for more details.
53 * You should have received a copy of the GNU General Public License
54 * along with this program. If not, see http://www.gnu.org/licenses/.
56 *------------------------------------------------------------------------
57 ** See the file ChangeLog for a revision history. */
59 /* This parser handles all forms of promotion.
60 * The parser resolves ambiguous moves by searching and check-testing.
61 * It also parses comments of the form [anything] or (anything).
63 * [HGM] Parser extensively modified for bigger boards, Shogi-like syntax,
64 * and unknow pieces. All pieces are now mandatory upper case, but can be
65 * any letter A-Z. Files must be lower case (as before), but can run upto 'l'.
66 * Ranks can be 0-9. The parser returns 0 for off-board files and ranks.
67 * For an unknown piece (as mover or promotion piece) it returns
68 * IllegalMove, like it does when the piece doesn't match.
69 * Promotions can now also be appended Shogi-style, a bare '=' or '+',
70 * and this is then returned as promotion character. The piece indicator
71 * can be prefixed by a '+' to indicate it is a promoted piece.
76 #define NO_CONSTRAINT -1
79 #define UNPUT_BUF_SIZE YYLMAX
82 /* yytext is probably a char*, but could be a char[]. yy_text is set
83 in YY_DECL below, because if yytext is a char*, its value is not
86 #else /*!FLEX_SCANNER*/
87 /* yytext is definitely a char[], so yy_text can be set here, statically. */
88 char *yy_text = (char *) yytext;
93 /* [AP] use prototypes in function declarations */
97 #define YY_PROTO(proto) proto
99 #define YY_PROTO(proto) ()
101 /* end of [AP] fix */
104 #define YY_INPUT(buf, result, max_size) my_yy_input(buf, &result, max_size)
107 int _yylex YY_PROTO((void)); \
108 int yylex YY_PROTO((void)) \
110 int result = _yylex(); \
111 yy_text = (char *) yytext; \
114 int _yylex YY_PROTO((void))
122 /* The includes must be here, below the #undef input */
129 #else /* not STDC_HEADERS */
132 # else /* not HAVE_STRING_H */
133 # include <strings.h>
134 # endif /* not HAVE_STRING_H */
135 #endif /* not STDC_HEADERS */
141 #if defined(_amigados)
144 # include <fcntl.h> /* isatty() prototype */
145 # endif /* HAVE_FCNTL_H */
146 #endif /* defined(_amigados) */
150 #include "frontend.h"
154 extern int PosFlags P((int));
156 extern Board boards[MAX_MOVES];
158 int yyskipmoves = FALSE;
159 char currentMoveString[YYLMAX];
161 char unputBuffer[UNPUT_BUF_SIZE];
166 void my_yy_input P((char *buf, int *result, int max_size));
167 #else /*!FLEX_SCANNER*/
168 static int input P((void));
169 static void output P((int ch));
170 static void unput P((int ch));
171 int yylook P((void));
172 int yyback P((int *, int));
175 int yywrap P((void));
176 extern void CopyBoard P((Board to, Board from));
181 "+"?[A-Z][/]?[a-l][0-9][xX:-]?[a-l][0-9]((=?\(?[A-Z]\)?)|=)? {
183 * Fully-qualified algebraic move, possibly with promotion
185 int skip1 = 0, skip2 = 0, skip3 = 0, promoted = 0;
190 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
192 if (yytext[0] == '+') skip1 = skip3 = promoted = 1; /* [HGM] Shogi promoted */
195 if (yytext[1+skip1] == '/') skip1++;
197 /* remove the [xX:-] */
198 if ((yytext[3+skip1] == 'x') || (yytext[3+skip1] == 'X') ||
199 (yytext[3+skip1] == '-') || (yytext[3+skip1] == ':')) skip2 = 1;
201 currentMoveString[0] = yytext[1+skip1];
202 currentMoveString[1] = yytext[2+skip1];
203 currentMoveString[2] = yytext[3+skip1+skip2];
204 currentMoveString[3] = yytext[4+skip1+skip2];
205 currentMoveString[4] = NULLCHAR;
207 if (appData.debugMode) {
208 fprintf(debugFP, "Parser Qa1b2: yyleng=%d\n",
212 if (yyleng-skip1-skip2 > 5) { char c;
213 if (yytext[yyleng-1] == ')') {
214 c = currentMoveString[4] = ToLower(yytext[yyleng-2]);
216 c = currentMoveString[4] = ToLower(yytext[yyleng-1]);
218 currentMoveString[5] = NULLCHAR;
219 if(c != '=' && c != '+' && CharToPiece(c) == EmptySquare)
220 return IllegalMove; /* [HGM] promotion to invalid piece */
223 if (appData.debugMode) {
224 fprintf(debugFP, "parser: %s\n", currentMoveString);
226 /* [HGM] do not allow values beyond board size */
227 if(currentMoveString[1] - ONE >= BOARD_HEIGHT ||
228 currentMoveString[1] - ONE < 0 ||
229 currentMoveString[0] - AAA >= BOARD_RGHT ||
230 currentMoveString[3] - ONE >= BOARD_HEIGHT ||
231 currentMoveString[3] - ONE < 0 ||
232 currentMoveString[2] - AAA >= BOARD_RGHT ||
233 currentMoveString[0] - AAA < BOARD_LEFT ||
234 currentMoveString[2] - AAA < BOARD_LEFT )
235 return ImpossibleMove;
237 piece = boards[yyboardindex]
238 [currentMoveString[1] - ONE][currentMoveString[0] - AAA];
239 if(promoted) piece = (ChessSquare) (DEMOTED piece);
240 c = PieceToChar(piece);
241 if(c == '~') c = PieceToChar((ChessSquare) (DEMOTED piece));
242 if (ToLower(yytext[skip3]) != ToLower(c))
243 return (int) IllegalMove;
245 result = LegalityTest(boards[yyboardindex],
246 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: might think we can e.p.!
247 currentMoveString[1] - ONE,
248 currentMoveString[0] - AAA,
249 currentMoveString[3] - ONE,
250 currentMoveString[2] - AAA,
251 currentMoveString[4]);
253 if (currentMoveString[4] == NULLCHAR &&
254 (result == WhitePromotionKnight || result == BlackPromotionKnight ||
255 result == WhitePromotionQueen || result == BlackPromotionQueen)) {
256 currentMoveString[4] = PieceToChar(BlackQueen);
257 currentMoveString[5] = NULLCHAR;
263 [a-l][0-9][xX:-]?[a-l][0-9]((=?\(?[A-Za-z]\)?)|=)? {
265 * Simple algebraic move, possibly with promotion
266 * [HGM] Engine moves are received in this format, with lower-case promoChar!
271 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
273 /* remove the [xX:-] */
274 if ((yytext[2] == 'x') || (yytext[2] == 'X') ||
275 (yytext[2] == '-') || (yytext[2] == ':')) skip = 1;
277 currentMoveString[0] = yytext[0];
278 currentMoveString[1] = yytext[1];
279 currentMoveString[2] = yytext[2+skip];
280 currentMoveString[3] = yytext[3+skip];
281 currentMoveString[4] = NULLCHAR;
283 if (yyleng-skip > 4) { char c;
284 if (yytext[yyleng-1] == ')') {
285 c = currentMoveString[4] = ToLower(yytext[yyleng-2]);
287 c = currentMoveString[4] = ToLower(yytext[yyleng-1]);
289 currentMoveString[5] = NULLCHAR;
290 if(c != '=' && c != '+' && CharToPiece(c) == EmptySquare)
294 /* [HGM] do not allow values beyond board size */
295 if(currentMoveString[1] - ONE >= BOARD_HEIGHT ||
296 currentMoveString[1] - ONE < 0 ||
297 currentMoveString[0] - AAA >= BOARD_RGHT ||
298 currentMoveString[3] - ONE >= BOARD_HEIGHT ||
299 currentMoveString[3] - ONE < 0 ||
300 currentMoveString[2] - AAA >= BOARD_RGHT ||
301 currentMoveString[0] - AAA < BOARD_LEFT ||
302 currentMoveString[2] - AAA < BOARD_LEFT )
303 return ImpossibleMove;
305 result = LegalityTest(boards[yyboardindex],
306 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: might think we can e.p.!
307 currentMoveString[1] - ONE,
308 currentMoveString[0] - AAA,
309 currentMoveString[3] - ONE,
310 currentMoveString[2] - AAA,
311 currentMoveString[4]);
313 if (currentMoveString[4] == NULLCHAR) {
314 if(result == WhitePromotionKnight || result == BlackPromotionKnight ||
315 result == WhitePromotionQueen || result == BlackPromotionQueen) {
316 if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk)
317 currentMoveString[4] = PieceToChar(BlackFerz);
318 else if(gameInfo.variant == VariantGreat)
319 currentMoveString[4] = PieceToChar(BlackMan);
321 currentMoveString[4] = PieceToChar(BlackQueen);
322 currentMoveString[5] = NULLCHAR;
324 } else if(appData.testLegality && // strip off unnecessary and false promo characters
325 !(result == WhitePromotionQueen || result == BlackPromotionQueen ||
326 result == WhiteNonPromotion || result == BlackNonPromotion)) currentMoveString[4] = NULLCHAR;
331 [A-L][0-9][xX:-]?[A-L][0-9] {
333 * Simple algebraic move, in capitals
334 * [HGM] Engine moves are received in this format, with lower-case promoChar!
339 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
341 /* remove the [xX:-] */
342 if ((yytext[2] == 'x') || (yytext[2] == 'X') ||
343 (yytext[2] == '-') || (yytext[2] == ':')) skip = 1;
345 currentMoveString[0] = yytext[0]+32;
346 currentMoveString[1] = yytext[1];
347 currentMoveString[2] = yytext[2+skip]+32;
348 currentMoveString[3] = yytext[3+skip];
349 currentMoveString[4] = NULLCHAR;
351 /* [HGM] do not allow values beyond board size */
352 if(currentMoveString[1] - ONE >= BOARD_HEIGHT ||
353 currentMoveString[1] - ONE < 0 ||
354 currentMoveString[0] - AAA >= BOARD_RGHT ||
355 currentMoveString[3] - ONE >= BOARD_HEIGHT ||
356 currentMoveString[3] - ONE < 0 ||
357 currentMoveString[2] - AAA >= BOARD_RGHT ||
358 currentMoveString[0] - AAA < BOARD_LEFT ||
359 currentMoveString[2] - AAA < BOARD_LEFT )
360 return ImpossibleMove;
362 result = LegalityTest(boards[yyboardindex],
363 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: might think we can e.p.!
364 currentMoveString[1] - ONE,
365 currentMoveString[0] - AAA,
366 currentMoveString[3] - ONE,
367 currentMoveString[2] - AAA,
368 currentMoveString[4]);
370 if (currentMoveString[4] == NULLCHAR &&
371 (result == WhitePromotionKnight || result == BlackPromotionKnight ||
372 result == WhitePromotionQueen || result == BlackPromotionQueen)) {
373 if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk)
374 currentMoveString[4] = PieceToChar(BlackFerz);
375 else if(gameInfo.variant == VariantGreat)
376 currentMoveString[4] = PieceToChar(BlackMan);
378 currentMoveString[4] = PieceToChar(BlackQueen);
379 currentMoveString[5] = NULLCHAR;
380 } else if(appData.testLegality && // strip off unnecessary and false promo characters
381 !(result == WhitePromotionQueen || result == BlackPromotionQueen ||
382 result == WhiteNonPromotion || result == BlackNonPromotion)) currentMoveString[4] = NULLCHAR;
387 [a-l][0-9]((=?\(?[A-Za-z]\)?)|=)? {
389 * Pawn move, possibly with promotion
391 DisambiguateClosure cl;
392 int skip = 0; char c;
394 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
397 if (yytext[2] == '=' && yytext[3] != NULLCHAR) skip++;
398 if (yytext[2+skip] == '(') skip++;
400 cl.pieceIn = WhiteOnMove(yyboardindex) ? WhitePawn : BlackPawn;
402 cl.ffIn = yytext[0] - AAA;
403 cl.rtIn = yytext[1] - ONE;
404 cl.ftIn = yytext[0] - AAA;
405 c = cl.promoCharIn = ToLower(yytext[2+skip]);
407 /* [HGM] do not allow values beyond board size */
408 if(cl.rtIn >= BOARD_HEIGHT ||
410 cl.ffIn >= BOARD_RGHT ||
411 cl.ftIn < BOARD_LEFT )
412 return ImpossibleMove;
414 if(c != '=' && c != '+' && c != NULLCHAR && CharToPiece(c) == EmptySquare)
418 Disambiguate(boards[yyboardindex], PosFlags(yyboardindex), &cl);
420 currentMoveString[0] = cl.ff + AAA;
421 currentMoveString[1] = cl.rf + ONE;
422 currentMoveString[2] = cl.ft + AAA;
423 currentMoveString[3] = cl.rt + ONE;
424 currentMoveString[4] = cl.promoChar;
425 currentMoveString[5] = NULLCHAR;
427 return (int) cl.kind;
431 (ab|bc|cd|de|ef|fg|gh|hi|ij|jk|kl|lk|kj|ji|ih|hg|gf|fe|ed|dc|cb|ba|aa|bb|cc|dd|ee|ff|gg|hh|ii|jj|kk|ll|([a-l][xX:-][a-l]))((=?\(?[A-Z]\)?)|ep|"e.p."|=)? {
433 * Pawn capture, possibly with promotion, possibly ambiguous
435 DisambiguateClosure cl;
436 int skip1 = 0, skip2 = 0; char c;
438 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
440 /* remove trailing ep or e.p. (nonstandard PGN) */
441 if (yytext[yyleng-1] == 'p') {
443 yytext[yyleng] = NULLCHAR;
444 } else if (yytext[yyleng-1] == '.') {
446 yytext[yyleng] = NULLCHAR;
449 /* remove the [xX:-] and =() */
450 if ((yytext[1] == 'x') || (yytext[1] == 'X')
451 || (yytext[1] == ':') || (yytext[1] == '-')) skip1 = 1;
452 if (yytext[2+skip1] == '=' && yytext[3+skip1] != NULLCHAR) skip2++;
453 if (yytext[2+skip1+skip2] == '(') skip2++;
455 cl.pieceIn = WhiteOnMove(yyboardindex) ? WhitePawn : BlackPawn;
457 cl.ffIn = yytext[0] - AAA;
459 cl.ftIn = yytext[1+skip1] - AAA;
460 c = cl.promoCharIn = yytext[2+skip1+skip2];
462 /* [HGM] do not allow values beyond board size */
463 if(cl.ffIn >= BOARD_RGHT ||
464 cl.ffIn < BOARD_LEFT ||
465 cl.ftIn >= BOARD_RGHT ||
466 cl.ftIn < BOARD_LEFT )
467 return ImpossibleMove;
469 if(c != '=' && c != '+' && c != NULLCHAR && CharToPiece(c) == EmptySquare)
472 Disambiguate(boards[yyboardindex], PosFlags(yyboardindex), &cl);
474 currentMoveString[0] = cl.ff + AAA;
475 currentMoveString[1] = cl.rf + ONE;
476 currentMoveString[2] = cl.ft + AAA;
477 currentMoveString[3] = cl.rt + ONE;
478 currentMoveString[4] = cl.promoChar;
479 currentMoveString[5] = NULLCHAR;
481 return (int) cl.kind;
484 [a-l][xX:]?[a-l][0-9]((=?\(?[A-Z]\)?)|ep|"e.p."|=)? {
486 * unambiguously abbreviated Pawn capture, possibly with promotion
489 ChessMove result; char c;
491 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
493 /* remove trailing ep or e.p. (nonstandard PGN) */
494 if (yytext[yyleng-1] == 'p') {
496 yytext[yyleng] = NULLCHAR;
497 } else if (yytext[yyleng-1] == '.') {
499 yytext[yyleng] = NULLCHAR;
502 /* remove the [xX:-] */
503 if ((yytext[1] == 'x') || (yytext[1] == 'X')
504 || (yytext[1] == ':') || (yytext[1] == '-')) skip = 1;
506 currentMoveString[0] = yytext[0];
507 currentMoveString[2] = yytext[1+skip];
508 currentMoveString[3] = yytext[2+skip];
510 /* [HGM] do not allow values beyond board size */
511 if(currentMoveString[0] - AAA >= BOARD_RGHT ||
512 currentMoveString[3] - ONE >= BOARD_HEIGHT ||
513 currentMoveString[3] - ONE < 0 ||
514 currentMoveString[2] - AAA >= BOARD_RGHT ||
515 currentMoveString[0] - AAA < BOARD_LEFT ||
516 currentMoveString[2] - AAA < BOARD_LEFT )
517 return ImpossibleMove;
519 if (gameInfo.variant == VariantXiangqi && /* [HGM] In Xiangqi rank stays same */
520 currentMoveString[0] != currentMoveString[2] ) {
521 currentMoveString[1] = yytext[2+skip];
523 if (WhiteOnMove(yyboardindex)) {
524 if (yytext[2+skip] == ONE) return (int) ImpossibleMove;
525 currentMoveString[1] = yytext[2+skip] - 1;
526 if(boards[yyboardindex][currentMoveString[1]-ONE][currentMoveString[0]-AAA] != WhitePawn)
527 return ImpossibleMove;
529 currentMoveString[1] = currentMoveString[3] + 1;
530 if (currentMoveString[3] == ONE+BOARD_HEIGHT-1) return (int) ImpossibleMove;
531 if(boards[yyboardindex][currentMoveString[1]-ONE][currentMoveString[0]-AAA] != BlackPawn)
532 return ImpossibleMove;
534 if (yyleng-skip > 3) {
535 if (yytext[yyleng-1] == ')')
536 c = currentMoveString[4] = ToLower(yytext[yyleng-2]);
538 c = currentMoveString[4] = ToLower(yytext[yyleng-1]);
539 currentMoveString[5] = NULLCHAR;
540 if(c != '=' && c != '+' && CharToPiece(c) == EmptySquare)
543 currentMoveString[4] = NULLCHAR;
546 result = LegalityTest(boards[yyboardindex],
547 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: might think we can e.p.!
548 currentMoveString[1] - ONE,
549 currentMoveString[0] - AAA,
550 currentMoveString[3] - ONE,
551 currentMoveString[2] - AAA,
552 currentMoveString[4]);
554 if (currentMoveString[4] == NULLCHAR &&
555 (result == WhitePromotionQueen || result == BlackPromotionQueen ||
556 result == WhitePromotionKnight || result == BlackPromotionKnight)) {
557 currentMoveString[4] = PieceToChar(BlackQueen);
558 // [HGM] shatranj: take care of variants without Queen
559 if(gameInfo.variant == VariantShatranj || gameInfo.variant == VariantCourier || gameInfo.variant == VariantMakruk)
560 currentMoveString[4] = PieceToChar(BlackFerz);
561 if(gameInfo.variant == VariantGreat)
562 currentMoveString[4] = PieceToChar(BlackMan);
563 currentMoveString[5] = NULLCHAR;
566 if (result != IllegalMove) return (int) result;
568 /* Special case: improperly written en passant capture */
569 if (WhiteOnMove(yyboardindex)) {
570 if (currentMoveString[3] == '5') {
571 currentMoveString[1] = '5';
572 currentMoveString[3] = '6';
574 return (int) IllegalMove;
577 if (currentMoveString[3] == '4') {
578 currentMoveString[1] = '4';
579 currentMoveString[3] = '3';
581 return (int) IllegalMove;
585 result = LegalityTest(boards[yyboardindex],
586 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: might think we can e.p.!
587 currentMoveString[1] - ONE,
588 currentMoveString[0] - AAA,
589 currentMoveString[3] - ONE,
590 currentMoveString[2] - AAA,
591 currentMoveString[4]);
593 if (result == WhiteCapturesEnPassant || result == BlackCapturesEnPassant)
596 return (int) IllegalMove;
599 "+"?[A-Z][xX:-]?[a-l][0-9]=? {
601 * piece move, possibly ambiguous
603 DisambiguateClosure cl;
604 int skip = 0, skip2 = 0, promoted = 0;
606 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
608 if(yytext[0] == '+') promoted = skip = skip2 = 1;
610 /* remove the [xX:-] */
611 if ((yytext[1+skip] == 'x') || (yytext[1+skip] == 'X')
612 || (yytext[1+skip] == ':') || (yytext[1+skip] == '-')) skip++;
614 if (WhiteOnMove(yyboardindex)) {
615 cl.pieceIn = CharToPiece(ToUpper(yytext[skip2]));
617 cl.pieceIn = CharToPiece(ToLower(yytext[skip2]));
619 if(promoted) cl.pieceIn = (ChessSquare) (PROMOTED cl.pieceIn);
623 cl.rtIn = yytext[2+skip] - ONE;
624 cl.ftIn = yytext[1+skip] - AAA;
625 cl.promoCharIn = NULLCHAR;
627 if(yyleng-skip > 3) /* [HGM] can have Shogi-style promotion */
628 cl.promoCharIn = yytext[yyleng-1];
630 if (appData.debugMode) {
631 fprintf(debugFP, "Parser Qa1: yyleng=%d, %d(%d,%d)-(%d,%d) = %d (%c)\n",
633 cl.pieceIn,cl.ffIn,cl.rfIn,cl.ftIn,cl.rtIn,cl.promoCharIn,cl.promoCharIn?cl.promoCharIn:' ');
636 /* [HGM] but do not allow values beyond board size */
637 if(cl.rtIn >= BOARD_HEIGHT ||
639 cl.ftIn >= BOARD_RGHT ||
640 cl.ftIn < BOARD_LEFT )
641 return ImpossibleMove;
643 Disambiguate(boards[yyboardindex], PosFlags(yyboardindex), &cl);
645 currentMoveString[0] = cl.ff + AAA;
646 currentMoveString[1] = cl.rf + ONE;
647 currentMoveString[2] = cl.ft + AAA;
648 currentMoveString[3] = cl.rt + ONE;
649 currentMoveString[4] = cl.promoChar;
650 currentMoveString[5] = NULLCHAR;
652 return (int) cl.kind;
655 "+"?[A-Z][a-l0-9][xX:-]?[a-l][0-9]=? {
657 * piece move with rank or file disambiguator
659 DisambiguateClosure cl;
660 int skip = 0, skip2 = 0; int promoted=0;
662 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
664 if(yytext[0]=='+') promoted = skip = skip2 = 1;
666 /* remove the [xX:-] */
667 if ((yytext[2+skip] == 'x') || (yytext[2+skip] == 'X')
668 || (yytext[2+skip] == ':') || (yytext[2+skip] == '-')) skip++;
670 if (WhiteOnMove(yyboardindex)) {
671 cl.pieceIn = CharToPiece(ToUpper(yytext[skip2]));
673 cl.pieceIn = CharToPiece(ToLower(yytext[skip2]));
675 if(promoted) cl.pieceIn = (ChessSquare) (PROMOTED cl.pieceIn);
677 if (isalpha(yytext[1+skip2])) {
679 cl.ffIn = yytext[1+skip2] - AAA;
681 if(cl.ffIn >= BOARD_RGHT ||
682 cl.ffIn < BOARD_LEFT ) return 0;
684 cl.rfIn = yytext[1+skip2] - ONE;
686 if(cl.rfIn >= BOARD_HEIGHT ||
687 cl.rfIn < 0) return 0;
689 cl.rtIn = yytext[3+skip] - ONE;
690 cl.ftIn = yytext[2+skip] - AAA;
691 cl.promoCharIn = NULLCHAR;
693 if(yyleng-skip > 4) /* [HGM] can have Shogi-style promotion */
694 cl.promoCharIn = yytext[yyleng-1];
696 /* [HGM] do not allow values beyond board size */
697 if(cl.rtIn >= BOARD_HEIGHT ||
699 cl.ftIn >= BOARD_RGHT ||
700 cl.ftIn < BOARD_LEFT )
701 return ImpossibleMove;
703 Disambiguate(boards[yyboardindex], PosFlags(yyboardindex), &cl);
705 currentMoveString[0] = cl.ff + AAA;
706 currentMoveString[1] = cl.rf + ONE;
707 currentMoveString[2] = cl.ft + AAA;
708 currentMoveString[3] = cl.rt + ONE;
709 currentMoveString[4] = cl.promoChar;
710 currentMoveString[5] = NULLCHAR;
712 return (int) cl.kind;
715 000|0-0-0|ooo|OOO|o-o-o|O-O-O {
718 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
720 /* [HGM] all squares referenced to board edges in stead of absolute */
721 if (WhiteOnMove(yyboardindex)) {
722 if (boards[yyboardindex][0][(BOARD_WIDTH-1)>>1] == WhiteKing) {
723 /* ICS wild castling */
725 ff = (BOARD_WIDTH-1)>>1;
735 if (boards[yyboardindex][BOARD_HEIGHT-1][(BOARD_WIDTH-1)>>1] == BlackKing) {
736 /* ICS wild castling */
738 ff = (BOARD_WIDTH-1)>>1;
748 if(PosFlags(0) & F_FRC_TYPE_CASTLING) {
749 if (WhiteOnMove(yyboardindex)) {
750 ff = initialRights[2];
751 ft = initialRights[1];
753 ff = initialRights[5];
754 ft = initialRights[4];
756 if (appData.debugMode)
758 fprintf(debugFP, "Parser FRC long %d %d\n", ff, ft);
760 if(ff < 0 || ft < 0) return 0;
762 sprintf(currentMoveString, "%c%c%c%c",ff+AAA,rf+ONE,ft+AAA,rt+ONE);
763 if (appData.debugMode) {
764 fprintf(debugFP, "long castling %d %d\n", ff, ft);
766 return (int) LegalityTest(boards[yyboardindex],
767 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: e.p.!
768 rf, ff, rt, ft, NULLCHAR);
771 00|0-0|oo|OO|o-o|O-O {
774 if (yyskipmoves) return (int) AmbiguousMove; /* not disambiguated */
776 if (WhiteOnMove(yyboardindex)) {
777 if (boards[yyboardindex][0][(BOARD_WIDTH-1)>>1] == WhiteKing) {
778 /* ICS wild castling */
780 ff = (BOARD_WIDTH-1)>>1;
790 if (boards[yyboardindex][BOARD_HEIGHT-1][(BOARD_WIDTH-1)>>1] == BlackKing) {
791 /* ICS wild castling */
793 ff = (BOARD_WIDTH-1)>>1;
803 if(PosFlags(0) & F_FRC_TYPE_CASTLING) {
804 if (WhiteOnMove(yyboardindex)) {
805 ff = initialRights[2];
806 ft = initialRights[0];
808 ff = initialRights[5];
809 ft = initialRights[3];
811 if (appData.debugMode) {
812 fprintf(debugFP, "Parser FRC short %d %d\n", ff, ft);
814 if(ff < 0 || ft < 0) return 0;
816 sprintf(currentMoveString, "%c%c%c%c",ff+AAA,rf+ONE,ft+AAA,rt+ONE);
817 if (appData.debugMode) {
818 fprintf(debugFP, "short castling %d %d\n", ff, ft);
821 return (int) LegalityTest(boards[yyboardindex],
822 PosFlags(yyboardindex)&~F_MANDATORY_CAPTURE, // [HGM] losers: e.p.!
823 rf, ff, rt, ft, NULLCHAR);
826 [A-Z][@*][a-l][0-9] {
827 /* Bughouse piece drop. */
828 currentMoveString[1] = '@';
829 currentMoveString[2] = yytext[2];
830 currentMoveString[3] = yytext[3];
831 currentMoveString[4] = NULLCHAR;
833 if (appData.debugMode) {
834 fprintf(debugFP, "Drop: %s\n", currentMoveString);
836 /* [HGM] do not allow values beyond board size */
837 if(currentMoveString[3] - ONE >= BOARD_HEIGHT ||
838 currentMoveString[2] - AAA >= BOARD_WIDTH )
839 return ImpossibleMove;
841 if (WhiteOnMove(yyboardindex)) {
842 currentMoveString[0] = ToUpper(yytext[0]);
844 currentMoveString[0] = ToLower(yytext[0]);
846 return LegalityTest(boards[yyboardindex], PosFlags(yyboardindex), DROP_RANK, // [HGM] does drops now too
847 CharToPiece(currentMoveString[0]), currentMoveString[3] - ONE, currentMoveString[2] - AAA, NULLCHAR);
851 if (WhiteOnMove(yyboardindex))
852 return (int) BlackWins;
854 return (int) WhiteWins;
857 (([Ww](hite)?)|([Bb](lack)?))" "(([Rr]esign)|([Ff]orfeit))(s|ed)? {
858 return (int) (ToUpper(yytext[0]) == 'W' ? BlackWins : WhiteWins);
861 (([Ww](hite)?)|([Bb](lack)?))" "[Dd]isconnect(s|ed) {
862 return (int) GameUnfinished;
866 return (int) GameIsDrawn;
870 return (int) GameIsDrawn;
874 if (WhiteOnMove(yyboardindex))
875 return (int) BlackWins;
877 return (int) WhiteWins;
881 if (WhiteOnMove(yyboardindex))
882 return (int) BlackWins;
884 return (int) WhiteWins;
887 [Dd]raw(n)?(" "by)?(" "[Rr]epetition)|(" "[Aa]gree(d|ment)) {
888 return (int) GameIsDrawn;
891 [Dd]raw(n)?(" (".*")")? {
892 return (int) GameIsDrawn;
895 (([Ww](hite)?)|([Bb](lack)?))" "(([Mm]ates)|([Ww][io]n(s)?)) {
896 return (int) (ToUpper(yytext[0]) == 'W' ? WhiteWins : BlackWins);
899 (([Ww](hite)?)|([Bb](lack)?))" "(([Mm]ated)|([Ll]os[tes]+)) {
900 return (int) (ToUpper(yytext[0]) == 'W' ? BlackWins : WhiteWins);
903 ("{"[^\}\n]*"} ")?(1-0|"1 - 0"|"1/0"|"1 / 0"|"1:0"|"1 : 0")(" (".*")"|" {".*"}")? {
904 return (int) WhiteWins;
907 ("{"[^\}\n]*"} ")?(0-1|"0 - 1"|"0/1"|"0 / 1"|"0:1"|"0 : 1")(" (".*")"|" {".*"}")? {
908 return (int) BlackWins;
911 ("{"[^\}\n]*"} ")?("1/2"|"1 / 2")(" "?[-:]" "?("1/2"|"1 / 2"))?(" (".*")"|" {".*"}")? {
912 return (int) GameIsDrawn;
915 ("{"[^\}\n]*"} ")?"*"(" (".*")"|" {".*"}")? {
916 return (int) GameUnfinished;
919 [1-9][0-9]*/"."?[ \t\n]*[a-lNnPpRrBQqKACFEWDGHOo] {
921 if ((yyleng == 1) && (yytext[0] == '1'))
922 return (int) MoveNumberOne;
925 \([0-9]+:[0-9][0-9](\.[0-9]+)?\)|\{[0-9]+:[0-9][0-9](\.[0-9]+)?\} {
926 /* elapsed time indication, e.g. (0:12) or {10:21.071} */
927 return (int) ElapsedTime;
931 /* position diagram enclosed in [-- --] */
932 return (int) PositionDiagram;
935 ^"{--------------"\n[^\}]*\n"--------------}"$ {
936 /* position diagram enclosed in {-- --} */
937 return (int) PositionDiagram;
940 \[[ \t\n]*[A-Za-z0-9][A-Za-z0-9_+#=-]*[ \t\n]*\"[^"]*\"[ \t\n]*\] {
944 [Gg](nu|NU)" "?[Cc](hess|HESS).*[Gg](ame|AME) {
945 return (int) GNUChessGame;
948 ^[#;%]" "[^ ]*(" game file"|" position file").*$ {
949 return (int) XBoardGame;
952 \$[0-9]+ { /* numeric annotation glyph */
956 \{[^\}]*\} { /* anything in {} */
957 return (int) Comment;
960 ;.*$ { /* ; to end of line */
961 return (int) Comment;
964 \[[^\]]*\] { /* anything in [] */
965 return (int) Comment;
968 \([^()]*(\([^()]*(\([^()]*(\([^()]*\)[^()]*)*\)[^()]*)*\)[^()]*)+[^()]*\) { /* very nested () */
969 return (int) Comment;
972 \([^)][^)]+\) { /* >=2 chars in () */
973 return (int) Comment;
976 ^[-a-zA-Z0-9]+:" ".*(\n[ \t]+.*)* {
977 /* Skip mail headers */
981 /* Skip random words */
985 /* Skip everything else */
991 static char *StringToLex;
1000 if (StringToLex != NULL) {
1002 if (ret == NULLCHAR)
1006 } else if (unputCount > 0) {
1007 ret = unputBuffer[--unputCount];
1019 * Return offset of next pattern within current file
1023 int offset = ftell(lexFP) - unputCount;
1031 static void output(ch)
1034 if(appData.debugMode) fprintf(debugFP, "PARSER BUG: unmatched character '%c' (0%o)\n",
1038 static void unput(ch)
1041 if (ch == 0) return;
1042 if (StringToLex != NULL) {
1045 if (unputCount >= UNPUT_BUF_SIZE)
1046 if(appData.debugMode) fprintf(debugFP, "PARSER BUG: unput buffer overflow '%c' (0%o)\n",
1048 unputBuffer[unputCount++] = ch;
1052 /* Get ready to lex from a new file. Kludge below sticks
1053 an artificial newline at the front of the file, which the
1054 above grammar ignores, but which makes ^ at start of pattern
1055 match at the real start of the file.
1063 unput('\n'); /* kludge */
1066 /* Get ready to lex from a string. ^ at start of pattern WON'T
1067 match at the start of the string!
1076 #endif /*!FLEX_SCANNER*/
1079 void my_yy_input(buf, result, max_size)
1086 if (StringToLex != NULL) {
1088 while (*StringToLex != NULLCHAR) {
1089 *buf++ = *StringToLex++;
1095 count = fread(buf, 1, max_size, yyin);
1105 static YY_BUFFER_STATE my_file_buffer = NULL;
1108 Return offset of next pattern in the current file.
1112 int pos = yy_c_buf_p - YY_CURRENT_BUFFER->yy_ch_buf;
1114 return(ftell(YY_CURRENT_BUFFER->yy_input_file) -
1122 if (my_file_buffer != NULL)
1123 yy_delete_buffer(my_file_buffer);
1125 my_file_buffer = yy_create_buffer(stdin, YY_BUF_SIZE);
1126 yy_switch_to_buffer(my_file_buffer);
1132 if (my_file_buffer != NULL)
1133 yy_delete_buffer(my_file_buffer);
1135 my_file_buffer = yy_create_buffer(f, YY_BUF_SIZE);
1136 yy_switch_to_buffer(my_file_buffer);
1138 #endif /*FLEX_SCANNER*/
1145 /* Parse a move from the given string s */
1146 /* ^ at start of pattern WON'T work here unless using flex */
1147 ChessMove yylexstr(boardIndex, s, text, len)
1148 int boardIndex, len;
1152 char *oldStringToLex;
1154 YY_BUFFER_STATE buffer, oldBuffer;
1157 yyboardindex = boardIndex;
1158 oldStringToLex = StringToLex;
1161 buffer = yy_create_buffer(stdin, YY_BUF_SIZE);
1162 oldBuffer = YY_CURRENT_BUFFER;
1163 yy_switch_to_buffer(buffer);
1164 #endif /*FLEX_SCANNER*/
1166 ret = (ChessMove) yylex();
1167 strncpy(text, yy_text, len-1); // [HGM] vari: yy_text is not available to caller after buffer switch ?!?
1168 text[len-1] = NULLCHAR;
1171 if (oldBuffer != NULL)
1172 yy_switch_to_buffer(oldBuffer);
1173 yy_delete_buffer(buffer);
1174 #endif /*FLEX_SCANNER*/
1175 StringToLex = oldStringToLex;