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1 zoff99 2 /* Expression parsing for plural form selection.
2     Copyright (C) 2000-2001, 2003 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". */
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
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
99     EXTRACT_PLURAL_EXPRESSION (const char *nullentry, struct expression **pluralp,
100     unsigned long int *npluralsp)
101     {
102     if (nullentry != NULL)
103     {
104     const char *plural;
105     const char *nplurals;
106    
107     plural = strstr (nullentry, "plural=");
108     nplurals = strstr (nullentry, "nplurals=");
109     if (plural == NULL || nplurals == NULL)
110     goto no_plural;
111     else
112     {
113     char *endp;
114     unsigned long int n;
115     struct parse_args args;
116    
117     /* First get the number. */
118     nplurals += 9;
119     while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
120     ++nplurals;
121     if (!(*nplurals >= '0' && *nplurals <= '9'))
122     goto no_plural;
123     #if defined HAVE_STRTOUL || defined _LIBC
124     n = strtoul (nplurals, &endp, 10);
125     #else
126     for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
127     n = n * 10 + (*endp - '0');
128     #endif
129     if (nplurals == endp)
130     goto no_plural;
131     *npluralsp = n;
132    
133     /* Due to the restrictions bison imposes onto the interface of the
134     scanner function we have to put the input string and the result
135     passed up from the parser into the same structure which address
136     is passed down to the parser. */
137     plural += 7;
138     args.cp = plural;
139     if (PLURAL_PARSE (&args) != 0)
140     goto no_plural;
141     *pluralp = args.res;
142     }
143     }
144     else
145     {
146     /* By default we are using the Germanic form: singular form only
147     for `one', the plural form otherwise. Yes, this is also what
148     English is using since English is a Germanic language. */
149     no_plural:
150     INIT_GERMANIC_PLURAL ();
151     *pluralp = &GERMANIC_PLURAL;
152     *npluralsp = 2;
153     }
154     }

   
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