1/* Expression parsing for plural form selection.
2 Copyright (C) 2000-2023 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
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) 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
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#include <ctype.h>
23#include <stdlib.h>
24#include <string.h>
25
26#include <plural-exp.h>
27
28#if (defined __GNUC__ && !(defined __APPLE_CC_ && __APPLE_CC__ > 1) && \
29 !defined __cplusplus) \
30 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
31
32/* These structs are the constant expression for the germanic plural
33 form determination. It represents the expression "n != 1". */
34static const struct expression plvar =
35{
36 .nargs = 0,
37 .operation = var,
38};
39static const struct expression plone =
40{
41 .nargs = 0,
42 .operation = num,
43 .val =
44 {
45 .num = 1
46 }
47};
48const struct expression GERMANIC_PLURAL =
49{
50 .nargs = 2,
51 .operation = not_equal,
52 .val =
53 {
54 .args =
55 {
56 [0] = (struct expression *) &plvar,
57 [1] = (struct expression *) &plone
58 }
59 }
60};
61
62# define INIT_GERMANIC_PLURAL()
63
64#else
65
66/* For compilers without support for ISO C 99 struct/union initializers:
67 Initialization at run-time. */
68
69static struct expression plvar;
70static struct expression plone;
71struct expression GERMANIC_PLURAL;
72
73static void
74init_germanic_plural (void)
75{
76 if (plone.val.num == 0)
77 {
78 plvar.nargs = 0;
79 plvar.operation = var;
80
81 plone.nargs = 0;
82 plone.operation = num;
83 plone.val.num = 1;
84
85 GERMANIC_PLURAL.nargs = 2;
86 GERMANIC_PLURAL.operation = not_equal;
87 GERMANIC_PLURAL.val.args[0] = &plvar;
88 GERMANIC_PLURAL.val.args[1] = &plone;
89 }
90}
91
92# define INIT_GERMANIC_PLURAL() init_germanic_plural ()
93
94#endif
95
96void
97EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
98 const struct expression **pluralp,
99 unsigned long int *npluralsp)
100{
101 if (nullentry != NULL)
102 {
103 const char *plural;
104 const char *nplurals;
105
106 plural = strstr (nullentry, "plural=");
107 nplurals = strstr (nullentry, "nplurals=");
108 if (plural == NULL || nplurals == NULL)
109 goto no_plural;
110 else
111 {
112 char *endp;
113 unsigned long int n;
114 struct parse_args args;
115
116 /* First get the number. */
117 nplurals += 9;
118 while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
119 ++nplurals;
120 if (!(*nplurals >= '0' && *nplurals <= '9'))
121 goto no_plural;
122#if defined HAVE_STRTOUL || defined _LIBC
123 n = strtoul (nplurals, &endp, 10);
124#else
125 for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
126 n = n * 10 + (*endp - '0');
127#endif
128 if (nplurals == endp)
129 goto no_plural;
130 *npluralsp = n;
131
132 /* Due to the restrictions bison imposes onto the interface of the
133 scanner function we have to put the input string and the result
134 passed up from the parser into the same structure which address
135 is passed down to the parser. */
136 plural += 7;
137 args.cp = plural;
138 if (PLURAL_PARSE (&args) != 0)
139 goto no_plural;
140 *pluralp = args.res;
141 }
142 }
143 else
144 {
145 /* By default we are using the Germanic form: singular form only
146 for `one', the plural form otherwise. Yes, this is also what
147 English is using since English is a Germanic language. */
148 no_plural:
149 INIT_GERMANIC_PLURAL ();
150 *pluralp = &GERMANIC_PLURAL;
151 *npluralsp = 2;
152 }
153}
154