/[zanavi_public1]/navit/intl/plural-exp.c
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Fri Oct 28 21:19:04 2011 UTC (8 years, 3 months ago) by zoff99
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1 /* 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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