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1 # Simple calculator. -*- Autotest -*-
2
3 # Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4 # Foundation, Inc.
5
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2, or (at your option)
9 # any later version.
10
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
15
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 # 02110-1301, USA.
20
21 ## ---------------------------------------------------- ##
22 ## Compile the grammar described in the documentation. ##
23 ## ---------------------------------------------------- ##
24
25
26 # ------------------------- #
27 # Helping Autotest macros. #
28 # ------------------------- #
29
30
31 # _AT_DATA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
32 # -----------------------------------------------
33 # Produce `calc.y'. Don't call this macro directly, because it contains
34 # some occurrences of `$1' etc. which will be interpreted by m4. So
35 # you should call it with $1, $2, and $3 as arguments, which is what
36 # AT_DATA_CALC_Y does.
37 m4_define([_AT_DATA_CALC_Y],
38 [m4_if([$1$2$3], $[1]$[2]$[3], [],
39 [m4_fatal([$0: Invalid arguments: $@])])dnl
40 AT_DATA_GRAMMAR([calc.y],
41 [[/* Infix notation calculator--calc */
42 ]$4
43 AT_SKEL_CC_IF(
44 [%define "global_tokens_and_yystype"])[
45 %{
46 #include <stdio.h>
47
48 #include <stdlib.h>
49 #include <string.h>
50 #if HAVE_UNISTD_H
51 # include <unistd.h>
52 #else
53 # undef alarm
54 # define alarm(seconds) /* empty */
55 #endif
56 #include <ctype.h>
57 #define USE(Var)
58
59 /* Exercise pre-prologue dependency to %union. */
60 typedef int semantic_value;
61
62 static semantic_value global_result = 0;
63 static int global_count = 0;
64 %}
65
66 /* Exercise %union. */
67 %union
68 {
69 semantic_value ival;
70 };
71
72 %{
73 static int power (int base, int exponent);
74 ]AT_SKEL_CC_IF(
75 [#ifndef YYLTYPE
76 # define YYLTYPE yy::location
77 #endif
78 #define first_line begin.line
79 #define first_column begin.column
80 #define last_line end.line
81 #define last_column end.column
82 ],
83 [/* yyerror receives the location if:
84 - %location & %pure & %glr
85 - %location & %pure & %yacc & %parse-param. */
86 static void yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *llocp, ])
87 AT_PARAM_IF([semantic_value *result, int *count, ])
88 const char *s
89 );])[
90 static int yylex (]AT_LEX_FORMALS[);
91 static int get_char (]AT_LEX_FORMALS[);
92 static void unget_char (]AT_LEX_PRE_FORMALS[ int c);
93 %}
94
95 ]AT_SKEL_CC_IF(
96 [/* The lalr1.cc skeleton, for backward compatibility, defines
97 a constructor for position that initializes the filename. The
98 glr.cc skeleton does not (and in fact cannot: location/position
99 are stored in a union, from which objects with constructors are
100 excluded in C++. */
101 %initial-action {
102 @$.initialize (0);
103 }
104 ])[
105
106 /* Bison Declarations */
107 %token CALC_EOF 0 "end of input"
108 %token <ival> NUM "number"
109 %type <ival> exp
110
111 %nonassoc '=' /* comparison */
112 %left '-' '+'
113 %left '*' '/'
114 %left NEG /* negation--unary minus */
115 %right '^' /* exponentiation */
116
117 /* Grammar follows */
118 %%
119 input:
120 line
121 | input line { ]AT_PARAM_IF([++*count; ++global_count;])[ }
122 ;
123
124 line:
125 '\n'
126 | exp '\n' { ]AT_PARAM_IF([*result = global_result = $1], [USE ($1)])[; }
127 ;
128
129 exp:
130 NUM { $$ = $1; }
131 | exp '=' exp
132 {
133 if ($1 != $3)
134 fprintf (stderr, "calc: error: %d != %d\n", $1, $3);
135 $$ = $1;
136 }
137 | exp '+' exp { $$ = $1 + $3; }
138 | exp '-' exp { $$ = $1 - $3; }
139 | exp '*' exp { $$ = $1 * $3; }
140 | exp '/' exp { $$ = $1 / $3; }
141 | '-' exp %prec NEG { $$ = -$2; }
142 | exp '^' exp { $$ = power ($1, $3); }
143 | '(' exp ')' { $$ = $2; }
144 | '(' error ')' { $$ = 1111; }
145 | '!' { $$ = 0; YYERROR; }
146 | '-' error { $$ = 0; YYERROR; }
147 ;
148 %%
149 /* The input. */
150 static FILE *input;
151
152 ]AT_SKEL_CC_IF(
153 [/* A C++ error reporting function. */
154 void
155 yy::parser::error (const location& l, const std::string& m)
156 {
157 (void) l;
158 std::cerr << AT_LOCATION_IF([l << ": " << ])m << std::endl;
159 }
160
161 int
162 yyparse (AT_PARAM_IF([semantic_value *result, int *count]))
163 {
164 yy::parser parser[]AT_PARAM_IF([ (result, count)]);
165 parser.set_debug_level (!!YYDEBUG);
166 return parser.parse ();
167 }
168 ],
169 [static void
170 yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *llocp, ])
171 AT_PARAM_IF([semantic_value *result, int *count, ])
172 const char *s)
173 {
174 AT_PARAM_IF([(void) result; (void) count;])
175 AT_YYERROR_SEES_LOC_IF([
176 fprintf (stderr, "%d.%d",
177 AT_LOC.first_line, AT_LOC.first_column);
178 if (AT_LOC.first_line != AT_LOC.last_line)
179 fprintf (stderr, "-%d.%d",
180 AT_LOC.last_line, AT_LOC.last_column - 1);
181 else if (AT_LOC.first_column != AT_LOC.last_column - 1)
182 fprintf (stderr, "-%d",
183 AT_LOC.last_column - 1);
184 fprintf (stderr, ": ");])
185 fprintf (stderr, "%s\n", s);
186 }])[
187
188
189 ]AT_LOCATION_IF([
190 static YYLTYPE last_yylloc;
191 ])[
192 static int
193 get_char (]AT_LEX_FORMALS[)
194 {
195 int res = getc (input);
196 ]AT_USE_LEX_ARGS[;
197 ]AT_LOCATION_IF([
198 last_yylloc = AT_LOC;
199 if (res == '\n')
200 {
201 AT_LOC.last_line++;
202 AT_LOC.last_column = 0;
203 }
204 else
205 AT_LOC.last_column++;
206 ])[
207 return res;
208 }
209
210
211 static void
212 unget_char (]AT_LEX_PRE_FORMALS[ int c)
213 {
214 ]AT_USE_LEX_ARGS[;
215 ]AT_LOCATION_IF([
216 /* Wrong when C == `\n'. */
217 AT_LOC = last_yylloc;
218 ])[
219 ungetc (c, input);
220 }
221
222 static int
223 read_signed_integer (]AT_LEX_FORMALS[)
224 {
225 int c = get_char (]AT_LEX_ARGS[);
226 int sign = 1;
227 int n = 0;
228
229 ]AT_USE_LEX_ARGS[;
230 if (c == '-')
231 {
232 c = get_char (]AT_LEX_ARGS[);
233 sign = -1;
234 }
235
236 while (isdigit (c))
237 {
238 n = 10 * n + (c - '0');
239 c = get_char (]AT_LEX_ARGS[);
240 }
241
242 unget_char (]AT_LEX_PRE_ARGS[ c);
243
244 return sign * n;
245 }
246
247
248
249 /*---------------------------------------------------------------.
250 | Lexical analyzer returns an integer on the stack and the token |
251 | NUM, or the ASCII character read if not a number. Skips all |
252 | blanks and tabs, returns 0 for EOF. |
253 `---------------------------------------------------------------*/
254
255 static int
256 yylex (]AT_LEX_FORMALS[)
257 {
258 static int init = 1;
259 int c;
260
261 if (init)
262 {
263 init = 0;
264 ]AT_LOCATION_IF([
265 AT_LOC.last_column = 0;
266 AT_LOC.last_line = 1;
267 ])[
268 }
269
270 ]AT_LOCATION_IF([
271 AT_LOC.first_column = AT_LOC.last_column;
272 AT_LOC.first_line = AT_LOC.last_line;
273 ])[
274
275 /* Skip white space. */
276 while ((c = get_char (]AT_LEX_ARGS[)) == ' ' || c == '\t')
277 {
278 ]AT_LOCATION_IF(
279 [ AT_LOC.first_column = AT_LOC.last_column;
280 AT_LOC.first_line = AT_LOC.last_line;
281 ])[
282 }
283
284 /* process numbers */
285 if (c == '.' || isdigit (c))
286 {
287 unget_char (]AT_LEX_PRE_ARGS[ c);
288 ]AT_VAL[.ival = read_signed_integer (]AT_LEX_ARGS[);
289 return NUM;
290 }
291
292 /* Return end-of-file. */
293 if (c == EOF)
294 return CALC_EOF;
295
296 /* Return single chars. */
297 return c;
298 }
299
300 static int
301 power (int base, int exponent)
302 {
303 int res = 1;
304 if (exponent < 0)
305 exit (3);
306 for (/* Niente */; exponent; --exponent)
307 res *= base;
308 return res;
309 }
310
311
312 int
313 main (int argc, const char **argv)
314 {
315 semantic_value result = 0;
316 int count = 0;
317 int status;
318
319 /* This used to be alarm (10), but that isn't enough time for
320 a July 1995 vintage DEC Alphastation 200 4/100 system,
321 according to Nelson H. F. Beebe. 100 seconds is enough. */
322 alarm (100);
323
324 if (argc == 2)
325 input = fopen (argv[1], "r");
326 else
327 input = stdin;
328
329 if (!input)
330 {
331 perror (argv[1]);
332 return 3;
333 }
334
335 ]AT_SKEL_CC_IF([], [m4_bmatch([$4], [%debug],
336 [ yydebug = 1;])])[
337 status = yyparse (]AT_PARAM_IF([&result, &count])[);
338 if (global_result != result)
339 abort ();
340 if (global_count != count)
341 abort ();
342 return status;
343 }
344 ]])
345 ])# _AT_DATA_CALC_Y
346
347
348 # AT_DATA_CALC_Y([BISON-OPTIONS])
349 # -------------------------------
350 # Produce `calc.y'.
351 m4_define([AT_DATA_CALC_Y],
352 [_AT_DATA_CALC_Y($[1], $[2], $[3], [$1])
353 ])
354
355
356
357 # _AT_CHECK_CALC(BISON-OPTIONS, INPUT, [NUM-STDERR-LINES])
358 # --------------------------------------------------------
359 # Run `calc' on INPUT and expect no STDOUT nor STDERR.
360 #
361 # If BISON-OPTIONS contains `%debug' but not `%glr-parser', then
362 #
363 # NUM-STDERR-LINES is the number of expected lines on stderr.
364 # Currently this is ignored, though, since the output format is fluctuating.
365 #
366 # We don't count GLR's traces yet, since its traces are somewhat
367 # different from LALR's.
368 m4_define([_AT_CHECK_CALC],
369 [AT_DATA([[input]],
370 [[$2
371 ]])
372 AT_PARSER_CHECK([./calc input], 0, [], [stderr])
373 ])
374
375
376 # _AT_CHECK_CALC_ERROR(BISON-OPTIONS, EXIT-STATUS, INPUT,
377 # [NUM-STDERR-LINES],
378 # [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
379 # ---------------------------------------------------------
380 # Run `calc' on INPUT, and expect a `syntax error' message.
381 #
382 # If INPUT starts with a slash, it is used as absolute input file name,
383 # otherwise as contents.
384 #
385 # NUM-STDERR-LINES is the number of expected lines on stderr.
386 # Currently this is ignored, though, since the output format is fluctuating.
387 #
388 # If BISON-OPTIONS contains `%location', then make sure the ERROR-LOCATION
389 # is correctly output on stderr.
390 #
391 # If BISON-OPTIONS contains `%error-verbose', then make sure the
392 # IF-YYERROR-VERBOSE message is properly output after `syntax error, '
393 # on STDERR.
394 #
395 # If BISON-OPTIONS contains `%debug' but not `%glr', then NUM-STDERR-LINES
396 # is the number of expected lines on stderr.
397 m4_define([_AT_CHECK_CALC_ERROR],
398 [m4_bmatch([$3], [^/],
399 [AT_PARSER_CHECK([./calc $3], $2, [], [stderr])],
400 [AT_DATA([[input]],
401 [[$3
402 ]])
403 AT_PARSER_CHECK([./calc input], $2, [], [stderr])])
404
405 # Normalize the observed and expected error messages, depending upon the
406 # options.
407 # 1. Remove the traces from observed.
408 sed '/^Starting/d
409 /^Entering/d
410 /^Stack/d
411 /^Reading/d
412 /^Reducing/d
413 /^Shifting/d
414 /^state/d
415 /^Cleanup:/d
416 /^Error:/d
417 /^Next/d
418 /^Discarding/d
419 / \$[[0-9$]]* = /d
420 /^yydestructor:/d' stderr >at-stderr
421 mv at-stderr stderr
422 # 2. Create the reference error message.
423 AT_DATA([[expout]],
424 [$5
425 ])
426 # 3. If locations are not used, remove them.
427 AT_YYERROR_SEES_LOC_IF([],
428 [[sed 's/^[-0-9.]*: //' expout >at-expout
429 mv at-expout expout]])
430 # 4. If error-verbose is not used, strip the`, unexpected....' part.
431 m4_bmatch([$1], [%error-verbose], [],
432 [[sed 's/syntax error, .*$/syntax error/' expout >at-expout
433 mv at-expout expout]])
434 # 5. Check
435 AT_CHECK([cat stderr], 0, [expout])
436 ])
437
438
439 # AT_CHECK_CALC([BISON-OPTIONS, [EXPECTED-TO-FAIL]])
440 # --------------------------------------------------
441 # Start a testing chunk which compiles `calc' grammar with
442 # BISON-OPTIONS, and performs several tests over the parser.
443 # However, if EXPECTED-TO-FAIL is nonempty, this test is expected to fail.
444 m4_define([AT_CHECK_CALC],
445 [# We use integers to avoid dependencies upon the precision of doubles.
446 AT_SETUP([Calculator $1])
447
448 m4_ifval([$2], [AT_CHECK([exit 77])])
449
450 AT_BISON_OPTION_PUSHDEFS([$1])
451
452 AT_DATA_CALC_Y([$1])
453
454 AT_SKEL_CC_IF(
455 [AT_CHECK([bison -o calc.cc calc.y])
456 AT_COMPILE_CXX([calc])],
457 [AT_CHECK([bison -o calc.c calc.y])
458 AT_COMPILE([calc])])
459
460 # Test the priorities.
461 _AT_CHECK_CALC([$1],
462 [1 + 2 * 3 = 7
463 1 + 2 * -3 = -5
464
465 -1^2 = -1
466 (-1)^2 = 1
467
468 ---1 = -1
469
470 1 - 2 - 3 = -4
471 1 - (2 - 3) = 2
472
473 2^2^3 = 256
474 (2^2)^3 = 64],
475 [842])
476
477 # Some syntax errors.
478 _AT_CHECK_CALC_ERROR([$1], [1], [0 0], [15],
479 [1.2: syntax error, unexpected number])
480 _AT_CHECK_CALC_ERROR([$1], [1], [1//2], [20],
481 [1.2: syntax error, unexpected '/', expecting number or '-' or '(' or '!'])
482 _AT_CHECK_CALC_ERROR([$1], [1], [error], [5],
483 [1.0: syntax error, unexpected $undefined])
484 _AT_CHECK_CALC_ERROR([$1], [1], [1 = 2 = 3], [30],
485 [1.6: syntax error, unexpected '='])
486 _AT_CHECK_CALC_ERROR([$1], [1],
487 [
488 +1],
489 [20],
490 [2.0: syntax error, unexpected '+'])
491 # Exercise error messages with EOF: work on an empty file.
492 _AT_CHECK_CALC_ERROR([$1], [1], [/dev/null], [4],
493 [1.0: syntax error, unexpected end of input])
494
495 # Exercise the error token: without it, we die at the first error,
496 # hence be sure to
497 #
498 # - have several errors which exercise different shift/discardings
499 # - (): nothing to pop, nothing to discard
500 # - (1 + 1 + 1 +): a lot to pop, nothing to discard
501 # - (* * *): nothing to pop, a lot to discard
502 # - (1 + 2 * *): some to pop and discard
503 #
504 # - test the action associated to `error'
505 #
506 # - check the look-ahead that triggers an error is not discarded
507 # when we enter error recovery. Below, the look-ahead causing the
508 # first error is ")", which is needed to recover from the error and
509 # produce the "0" that triggers the "0 != 1" error.
510 #
511 _AT_CHECK_CALC_ERROR([$1], [0],
512 [() + (1 + 1 + 1 +) + (* * *) + (1 * 2 * *) = 1],
513 [250],
514 [1.1: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
515 1.17: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
516 1.22: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
517 1.40: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
518 calc: error: 4444 != 1])
519
520 # The same, but this time exercising explicitly triggered syntax errors.
521 # POSIX says the look-ahead causing the error should not be discarded.
522 _AT_CHECK_CALC_ERROR([$1], [0], [(!) + (0 0) = 1], [102],
523 [1.9: syntax error, unexpected number
524 calc: error: 2222 != 1])
525 _AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (0 0) = 1], [113],
526 [1.3: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
527 1.11: syntax error, unexpected number
528 calc: error: 2222 != 1])
529 AT_BISON_OPTION_POPDEFS
530
531 AT_CLEANUP
532 ])# AT_CHECK_CALC
533
534
535
536
537 # ------------------------ #
538 # Simple LALR Calculator. #
539 # ------------------------ #
540
541 AT_BANNER([[Simple LALR(1) Calculator.]])
542
543 # AT_CHECK_CALC_LALR([BISON-OPTIONS])
544 # -----------------------------------
545 # Start a testing chunk which compiles `calc' grammar with
546 # BISON-OPTIONS, and performs several tests over the parser.
547 m4_define([AT_CHECK_CALC_LALR],
548 [AT_CHECK_CALC($@)])
549
550 AT_CHECK_CALC_LALR()
551
552 AT_CHECK_CALC_LALR([%defines])
553 AT_CHECK_CALC_LALR([%locations])
554 AT_CHECK_CALC_LALR([%name-prefix="calc"])
555 AT_CHECK_CALC_LALR([%verbose])
556 AT_CHECK_CALC_LALR([%yacc])
557 AT_CHECK_CALC_LALR([%error-verbose])
558
559 AT_CHECK_CALC_LALR([%pure-parser %locations])
560 AT_CHECK_CALC_LALR([%error-verbose %locations])
561
562 AT_CHECK_CALC_LALR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
563
564 AT_CHECK_CALC_LALR([%debug])
565 AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
566
567 AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
568
569 AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
570
571
572 # ----------------------- #
573 # Simple GLR Calculator. #
574 # ----------------------- #
575
576 AT_BANNER([[Simple GLR Calculator.]])
577
578 # AT_CHECK_CALC_GLR([BISON-OPTIONS])
579 # ----------------------------------
580 # Start a testing chunk which compiles `calc' grammar with
581 # BISON-OPTIONS and %glr-parser, and performs several tests over the parser.
582 m4_define([AT_CHECK_CALC_GLR],
583 [AT_CHECK_CALC([%glr-parser] $@)])
584
585
586 AT_CHECK_CALC_GLR()
587
588 AT_CHECK_CALC_GLR([%defines])
589 AT_CHECK_CALC_GLR([%locations])
590 AT_CHECK_CALC_GLR([%name-prefix="calc"])
591 AT_CHECK_CALC_GLR([%verbose])
592 AT_CHECK_CALC_GLR([%yacc])
593 AT_CHECK_CALC_GLR([%error-verbose])
594
595 AT_CHECK_CALC_GLR([%pure-parser %locations])
596 AT_CHECK_CALC_GLR([%error-verbose %locations])
597
598 AT_CHECK_CALC_GLR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
599
600 AT_CHECK_CALC_GLR([%debug])
601 AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
602
603 AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
604
605 AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
606
607
608 # ----------------------------- #
609 # Simple LALR1 C++ Calculator. #
610 # ----------------------------- #
611
612 AT_BANNER([[Simple LALR(1) C++ Calculator.]])
613
614 # AT_CHECK_CALC_LALR1_CC([BISON-OPTIONS])
615 # ---------------------------------------
616 # Start a testing chunk which compiles `calc' grammar with
617 # the C++ skeleton, and performs several tests over the parser.
618 m4_define([AT_CHECK_CALC_LALR1_CC],
619 [AT_CHECK_CALC([%skeleton "lalr1.cc" %defines %locations] $@)])
620
621 AT_CHECK_CALC_LALR1_CC([])
622 AT_CHECK_CALC_LALR1_CC([%error-verbose %name-prefix="calc" %verbose %yacc])
623
624 AT_CHECK_CALC_LALR1_CC([%error-verbose %debug %name-prefix="calc" %verbose %yacc])
625
626 AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %name-prefix="calc" %verbose %yacc])
627
628 AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
629
630
631
632 # --------------------------- #
633 # Simple GLR C++ Calculator. #
634 # --------------------------- #
635
636 AT_BANNER([[Simple GLR C++ Calculator.]])
637
638 # AT_CHECK_CALC_GLR_CC([BISON-OPTIONS])
639 # -------------------------------------
640 # Start a testing chunk which compiles `calc' grammar with
641 # the GLR C++ skeleton, and performs several tests over the parser.
642 m4_define([AT_CHECK_CALC_GLR_CC],
643 [AT_CHECK_CALC([%skeleton "glr.cc" %defines %locations] $@)])
644
645 #AT_CHECK_CALC_GLR_CC([])
646 #AT_CHECK_CALC_GLR_CC([%error-verbose %name-prefix="calc" %verbose %yacc])
647
648 # AT_CHECK_CALC_GLR_CC([%debug])
649 #AT_CHECK_CALC_GLR_CC([%error-verbose %debug %name-prefix="calc" %verbose %yacc])
650
651 AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix="calc" %verbose %yacc])
652
653 AT_CHECK_CALC_GLR_CC([%pure-parser %error-verbose %debug %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])