1  /* Expression parsing for plural form selection.
       2     Copyright (C) 2000, 2001 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__ && !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 (nullentry, pluralp, npluralsp)
     100       const char *nullentry;
     101       struct expression **pluralp;
     102       unsigned long int *npluralsp;
     103  {
     104    if (nullentry != NULL)
     105      {
     106        const char *plural;
     107        const char *nplurals;
     108  
     109        plural = strstr (nullentry, "plural=");
     110        nplurals = strstr (nullentry, "nplurals=");
     111        if (plural == NULL || nplurals == NULL)
     112  	goto no_plural;
     113        else
     114  	{
     115  	  char *endp;
     116  	  unsigned long int n;
     117  	  struct parse_args args;
     118  
     119  	  /* First get the number.  */
     120  	  nplurals += 9;
     121  	  while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
     122  	    ++nplurals;
     123  	  if (!(*nplurals >= '0' && *nplurals <= '9'))
     124  	    goto no_plural;
     125  #if defined HAVE_STRTOUL || defined _LIBC
     126  	  n = strtoul (nplurals, &endp, 10);
     127  #else
     128  	  for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
     129  	    n = n * 10 + (*endp - '0');
     130  #endif
     131  	  if (nplurals == endp)
     132  	    goto no_plural;
     133  	  *npluralsp = n;
     134  
     135  	  /* Due to the restrictions bison imposes onto the interface of the
     136  	     scanner function we have to put the input string and the result
     137  	     passed up from the parser into the same structure which address
     138  	     is passed down to the parser.  */
     139  	  plural += 7;
     140  	  args.cp = plural;
     141  	  if (PLURAL_PARSE (&args) != 0)
     142  	    goto no_plural;
     143  	  *pluralp = args.res;
     144  	}
     145      }
     146    else
     147      {
     148        /* By default we are using the Germanic form: singular form only
     149           for `one', the plural form otherwise.  Yes, this is also what
     150           English is using since English is a Germanic language.  */
     151      no_plural:
     152        INIT_GERMANIC_PLURAL ();
     153        *pluralp = &GERMANIC_PLURAL;
     154        *npluralsp = 2;
     155      }
     156  }