aboutsummaryrefslogtreecommitdiff
blob: f69fba7c602e9f890f8e5c3b2cd7fe1c487714ea (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
%{
/* Expression parsing for plural form selection.
   Copyright (C) 2000-2020 Free Software Foundation, Inc.
   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* For bison < 2.0, the bison generated parser uses alloca.  AIX 3 forces us
   to put this declaration at the beginning of the file.  The declaration in
   bison's skeleton file comes too late.  This must come before <config.h>
   because <config.h> may include arbitrary system headers.
   This can go away once the AM_INTL_SUBDIR macro requires bison >= 2.0.  */
#if defined _AIX && !defined __GNUC__
 #pragma alloca
#endif

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "plural-exp.h"

/* The main function generated by the parser is called __gettextparse,
   but we want it to be called PLURAL_PARSE.  */
#ifndef _LIBC
# define __gettextparse PLURAL_PARSE
#endif

%}
%parse-param {struct parse_args *arg}
%lex-param {struct parse_args *arg}
%define api.pure full
%expect 7

%union {
  unsigned long int num;
  enum expression_operator op;
  struct expression *exp;
}

%{
/* Prototypes for local functions.  */
static int yylex (YYSTYPE *lval, struct parse_args *arg);
static void yyerror (struct parse_args *arg, const char *str);

/* Allocation of expressions.  */

static struct expression *
new_exp (int nargs, enum expression_operator op,
	 struct expression * const *args)
{
  int i;
  struct expression *newp;

  /* If any of the argument could not be malloc'ed, just return NULL.  */
  for (i = nargs - 1; i >= 0; i--)
    if (args[i] == NULL)
      goto fail;

  /* Allocate a new expression.  */
  newp = (struct expression *) malloc (sizeof (*newp));
  if (newp != NULL)
    {
      newp->nargs = nargs;
      newp->operation = op;
      for (i = nargs - 1; i >= 0; i--)
	newp->val.args[i] = args[i];
      return newp;
    }

 fail:
  for (i = nargs - 1; i >= 0; i--)
    FREE_EXPRESSION (args[i]);

  return NULL;
}

static inline struct expression *
new_exp_0 (enum expression_operator op)
{
  return new_exp (0, op, NULL);
}

static inline struct expression *
new_exp_1 (enum expression_operator op, struct expression *right)
{
  struct expression *args[1];

  args[0] = right;
  return new_exp (1, op, args);
}

static struct expression *
new_exp_2 (enum expression_operator op, struct expression *left,
	   struct expression *right)
{
  struct expression *args[2];

  args[0] = left;
  args[1] = right;
  return new_exp (2, op, args);
}

static inline struct expression *
new_exp_3 (enum expression_operator op, struct expression *bexp,
	   struct expression *tbranch, struct expression *fbranch)
{
  struct expression *args[3];

  args[0] = bexp;
  args[1] = tbranch;
  args[2] = fbranch;
  return new_exp (3, op, args);
}

%}

/* This declares that all operators have the same associativity and the
   precedence order as in C.  See [Harbison, Steele: C, A Reference Manual].
   There is no unary minus and no bitwise operators.
   Operators with the same syntactic behaviour have been merged into a single
   token, to save space in the array generated by bison.  */
%right '?'		/*   ?		*/
%left '|'		/*   ||		*/
%left '&'		/*   &&		*/
%left EQUOP2		/*   == !=	*/
%left CMPOP2		/*   < > <= >=	*/
%left ADDOP2		/*   + -	*/
%left MULOP2		/*   * / %	*/
%right '!'		/*   !		*/

%token <op> EQUOP2 CMPOP2 ADDOP2 MULOP2
%token <num> NUMBER
%type <exp> exp

%%

start:	  exp
	  {
	    if ($1 == NULL)
	      YYABORT;
	    arg->res = $1;
	  }
	;

exp:	  exp '?' exp ':' exp
	  {
	    $$ = new_exp_3 (qmop, $1, $3, $5);
	  }
	| exp '|' exp
	  {
	    $$ = new_exp_2 (lor, $1, $3);
	  }
	| exp '&' exp
	  {
	    $$ = new_exp_2 (land, $1, $3);
	  }
	| exp EQUOP2 exp
	  {
	    $$ = new_exp_2 ($2, $1, $3);
	  }
	| exp CMPOP2 exp
	  {
	    $$ = new_exp_2 ($2, $1, $3);
	  }
	| exp ADDOP2 exp
	  {
	    $$ = new_exp_2 ($2, $1, $3);
	  }
	| exp MULOP2 exp
	  {
	    $$ = new_exp_2 ($2, $1, $3);
	  }
	| '!' exp
	  {
	    $$ = new_exp_1 (lnot, $2);
	  }
	| 'n'
	  {
	    $$ = new_exp_0 (var);
	  }
	| NUMBER
	  {
	    if (($$ = new_exp_0 (num)) != NULL)
	      $$->val.num = $1;
	  }
	| '(' exp ')'
	  {
	    $$ = $2;
	  }
	;

%%

void
FREE_EXPRESSION (struct expression *exp)
{
  if (exp == NULL)
    return;

  /* Handle the recursive case.  */
  switch (exp->nargs)
    {
    case 3:
      FREE_EXPRESSION (exp->val.args[2]);
      /* FALLTHROUGH */
    case 2:
      FREE_EXPRESSION (exp->val.args[1]);
      /* FALLTHROUGH */
    case 1:
      FREE_EXPRESSION (exp->val.args[0]);
      /* FALLTHROUGH */
    default:
      break;
    }

  free (exp);
}


static int
yylex (YYSTYPE *lval, struct parse_args *arg)
{
  const char *exp = arg->cp;
  int result;

  while (1)
    {
      if (exp[0] == '\0')
	{
	  arg->cp = exp;
	  return YYEOF;
	}

      if (exp[0] != ' ' && exp[0] != '\t')
	break;

      ++exp;
    }

  result = *exp++;
  switch (result)
    {
    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
      {
	unsigned long int n = result - '0';
	while (exp[0] >= '0' && exp[0] <= '9')
	  {
	    n *= 10;
	    n += exp[0] - '0';
	    ++exp;
	  }
	lval->num = n;
	result = NUMBER;
      }
      break;

    case '=':
      if (exp[0] == '=')
	{
	  ++exp;
	  lval->op = equal;
	  result = EQUOP2;
	}
      else
	result = YYERRCODE;
      break;

    case '!':
      if (exp[0] == '=')
	{
	  ++exp;
	  lval->op = not_equal;
	  result = EQUOP2;
	}
      break;

    case '&':
    case '|':
      if (exp[0] == result)
	++exp;
      else
	result = YYERRCODE;
      break;

    case '<':
      if (exp[0] == '=')
	{
	  ++exp;
	  lval->op = less_or_equal;
	}
      else
	lval->op = less_than;
      result = CMPOP2;
      break;

    case '>':
      if (exp[0] == '=')
	{
	  ++exp;
	  lval->op = greater_or_equal;
	}
      else
	lval->op = greater_than;
      result = CMPOP2;
      break;

    case '*':
      lval->op = mult;
      result = MULOP2;
      break;

    case '/':
      lval->op = divide;
      result = MULOP2;
      break;

    case '%':
      lval->op = module;
      result = MULOP2;
      break;

    case '+':
      lval->op = plus;
      result = ADDOP2;
      break;

    case '-':
      lval->op = minus;
      result = ADDOP2;
      break;

    case 'n':
    case '?':
    case ':':
    case '(':
    case ')':
      /* Nothing, just return the character.  */
      break;

    case ';':
    case '\n':
    case '\0':
      /* Be safe and let the user call this function again.  */
      --exp;
      result = YYEOF;
      break;

    default:
      result = YYERRCODE;
#if YYDEBUG != 0
      --exp;
#endif
      break;
    }

  arg->cp = exp;

  return result;
}


static void
yyerror (struct parse_args *arg, const char *str)
{
  /* Do nothing.  We don't print error messages here.  */
}