1/* Expression parsing for plural form selection.
2   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
3   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
4
5   This program is free software; you can redistribute it and/or modify it
6   under the terms of the GNU Library General Public License as published
7   by the Free Software Foundation; either version 2, or (at your option)
8   any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Library General Public License for more details.
14
15   You should have received a copy of the GNU Library General Public
16   License along with this program; if not, write to the Free Software
17   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18   USA.  */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include <ctype.h>
25#include <stdlib.h>
26#include <string.h>
27
28#include "plural-exp.h"
29
30#if (defined __GNUC__ && !defined __APPLE_CC__) \
31    || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
32
33/* These structs are the constant expression for the germanic plural
34   form determination.  It represents the expression  "n != 1".  */
35static const struct expression plvar =
36{
37  .nargs = 0,
38  .operation = var,
39};
40static const struct expression plone =
41{
42  .nargs = 0,
43  .operation = num,
44  .val =
45  {
46    .num = 1
47  }
48};
49struct expression GERMANIC_PLURAL =
50{
51  .nargs = 2,
52  .operation = not_equal,
53  .val =
54  {
55    .args =
56    {
57      [0] = (struct expression *) &plvar,
58      [1] = (struct expression *) &plone
59    }
60  }
61};
62
63# define INIT_GERMANIC_PLURAL()
64
65#else
66
67/* For compilers without support for ISO C 99 struct/union initializers:
68   Initialization at run-time.  */
69
70static struct expression plvar;
71static struct expression plone;
72struct expression GERMANIC_PLURAL;
73
74static void
75init_germanic_plural ()
76{
77  if (plone.val.num == 0)
78    {
79      plvar.nargs = 0;
80      plvar.operation = var;
81
82      plone.nargs = 0;
83      plone.operation = num;
84      plone.val.num = 1;
85
86      GERMANIC_PLURAL.nargs = 2;
87      GERMANIC_PLURAL.operation = not_equal;
88      GERMANIC_PLURAL.val.args[0] = &plvar;
89      GERMANIC_PLURAL.val.args[1] = &plone;
90    }
91}
92
93# define INIT_GERMANIC_PLURAL() init_germanic_plural ()
94
95#endif
96
97void
98internal_function
99EXTRACT_PLURAL_EXPRESSION (nullentry, pluralp, npluralsp)
100     const char *nullentry;
101     struct expression **pluralp;
102     unsigned long int *npluralsp;
103{
104  if (nullentry != NULL)
105    {
106      const char *plural;
107      const char *nplurals;
108
109      plural = strstr (nullentry, "plural=");
110      nplurals = strstr (nullentry, "nplurals=");
111      if (plural == NULL || nplurals == NULL)
112	goto no_plural;
113      else
114	{
115	  char *endp;
116	  unsigned long int n;
117	  struct parse_args args;
118
119	  /* First get the number.  */
120	  nplurals += 9;
121	  while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
122	    ++nplurals;
123	  if (!(*nplurals >= '0' && *nplurals <= '9'))
124	    goto no_plural;
125#if defined HAVE_STRTOUL || defined _LIBC
126	  n = strtoul (nplurals, &endp, 10);
127#else
128	  for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
129	    n = n * 10 + (*endp - '0');
130#endif
131	  if (nplurals == endp)
132	    goto no_plural;
133	  *npluralsp = n;
134
135	  /* Due to the restrictions bison imposes onto the interface of the
136	     scanner function we have to put the input string and the result
137	     passed up from the parser into the same structure which address
138	     is passed down to the parser.  */
139	  plural += 7;
140	  args.cp = plural;
141	  if (PLURAL_PARSE (&args) != 0)
142	    goto no_plural;
143	  *pluralp = args.res;
144	}
145    }
146  else
147    {
148      /* By default we are using the Germanic form: singular form only
149         for `one', the plural form otherwise.  Yes, this is also what
150         English is using since English is a Germanic language.  */
151    no_plural:
152      INIT_GERMANIC_PLURAL ();
153      *pluralp = &GERMANIC_PLURAL;
154      *npluralsp = 2;
155    }
156}
157