mingw/share/gettext/intl/plural-exp.c

   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
  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,
 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 }