1 /* Expression parsing for plural form selection.
2 Copyright (C) 2000-2001, 2003, 2005-2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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__ && !(__APPLE_CC__ > 1) && !defined __cplusplus) \
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". */
35 static const struct expression plvar =
36 {
37 .nargs = 0,
38 .operation = var,
39 };
40 static const struct expression plone =
41 {
42 .nargs = 0,
43 .operation = num,
44 .val =
45 {
46 .num = 1
47 }
48 };
49 struct 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
70 static struct expression plvar;
71 static struct expression plone;
72 struct expression GERMANIC_PLURAL;
73
74 static void
init_germanic_plural()75 init_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
97 void
98 internal_function
EXTRACT_PLURAL_EXPRESSION(const char * nullentry,const struct expression ** pluralp,unsigned long int * npluralsp)99 EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
100 const struct expression **pluralp,
101 unsigned long int *npluralsp)
102 {
103 if (nullentry != NULL)
104 {
105 const char *plural;
106 const char *nplurals;
107
108 plural = strstr (nullentry, "plural=");
109 nplurals = strstr (nullentry, "nplurals=");
110 if (plural == NULL || nplurals == NULL)
111 goto no_plural;
112 else
113 {
114 char *endp;
115 unsigned long int n;
116 struct parse_args args;
117
118 /* First get the number. */
119 nplurals += 9;
120 while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
121 ++nplurals;
122 if (!(*nplurals >= '0' && *nplurals <= '9'))
123 goto no_plural;
124 #if defined HAVE_STRTOUL || defined _LIBC
125 n = strtoul (nplurals, &endp, 10);
126 #else
127 for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
128 n = n * 10 + (*endp - '0');
129 #endif
130 if (nplurals == endp)
131 goto no_plural;
132 *npluralsp = n;
133
134 /* Due to the restrictions bison imposes onto the interface of the
135 scanner function we have to put the input string and the result
136 passed up from the parser into the same structure which address
137 is passed down to the parser. */
138 plural += 7;
139 args.cp = plural;
140 if (PLURAL_PARSE (&args) != 0)
141 goto no_plural;
142 *pluralp = args.res;
143 }
144 }
145 else
146 {
147 /* By default we are using the Germanic form: singular form only
148 for `one', the plural form otherwise. Yes, this is also what
149 English is using since English is a Germanic language. */
150 no_plural:
151 INIT_GERMANIC_PLURAL ();
152 *pluralp = &GERMANIC_PLURAL;
153 *npluralsp = 2;
154 }
155 }
156