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/* Expression parsing for plural form selection.
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   Copyright (C) 2000-2001, 2003 Free Software Foundation, Inc.
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   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU Library General Public License as published
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   by the Free Software Foundation; either version 2, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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   USA.  */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "plural-exp.h"
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#if (defined __GNUC__ && !defined __APPLE_CC__) \
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    || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
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/* These structs are the constant expression for the germanic plural
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   form determination.  It represents the expression  "n != 1".  */
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static const struct expression plvar =
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{
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  .nargs = 0,
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  .operation = var,
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};
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static const struct expression plone =
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{
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  .nargs = 0,
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  .operation = num,
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  .val =
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  {
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    .num = 1
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  }
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};
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struct expression GERMANIC_PLURAL =
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{
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  .nargs = 2,
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  .operation = not_equal,
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  .val =
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  {
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    .args =
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    {
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      [0] = (struct expression *) &plvar,
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      [1] = (struct expression *) &plone
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    }
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  }
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};
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# define INIT_GERMANIC_PLURAL()
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#else
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/* For compilers without support for ISO C 99 struct/union initializers:
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   Initialization at run-time.  */
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static struct expression plvar;
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static struct expression plone;
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struct expression GERMANIC_PLURAL;
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static void
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init_germanic_plural ()
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{
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  if (plone.val.num == 0)
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    {
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      plvar.nargs = 0;
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      plvar.operation = var;
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      plone.nargs = 0;
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      plone.operation = num;
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      plone.val.num = 1;
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      GERMANIC_PLURAL.nargs = 2;
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      GERMANIC_PLURAL.operation = not_equal;
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      GERMANIC_PLURAL.val.args[0] = &plvar;
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      GERMANIC_PLURAL.val.args[1] = &plone;
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    }
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}
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# define INIT_GERMANIC_PLURAL() init_germanic_plural ()
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#endif
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void
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internal_function
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EXTRACT_PLURAL_EXPRESSION (const char *nullentry, struct expression **pluralp,
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                           unsigned long int *npluralsp)
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{
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  if (nullentry != NULL)
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    {
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      const char *plural;
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      const char *nplurals;
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      plural = strstr (nullentry, "plural=");
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      nplurals = strstr (nullentry, "nplurals=");
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      if (plural == NULL || nplurals == NULL)
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        goto no_plural;
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      else
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        {
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          char *endp;
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          unsigned long int n;
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          struct parse_args args;
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          /* First get the number.  */
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          nplurals += 9;
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          while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
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            ++nplurals;
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          if (!(*nplurals >= '0' && *nplurals <= '9'))
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            goto no_plural;
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#if defined HAVE_STRTOUL || defined _LIBC
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          n = strtoul (nplurals, &endp, 10);
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#else
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          for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
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            n = n * 10 + (*endp - '0');
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#endif
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          if (nplurals == endp)
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            goto no_plural;
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          *npluralsp = n;
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          /* Due to the restrictions bison imposes onto the interface of the
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             scanner function we have to put the input string and the result
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             passed up from the parser into the same structure which address
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             is passed down to the parser.  */
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          plural += 7;
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          args.cp = plural;
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          if (PLURAL_PARSE (&args) != 0)
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            goto no_plural;
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          *pluralp = args.res;
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        }
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    }
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  else
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    {
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      /* By default we are using the Germanic form: singular form only
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         for `one', the plural form otherwise.  Yes, this is also what
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         English is using since English is a Germanic language.  */
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    no_plural:
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      INIT_GERMANIC_PLURAL ();
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      *pluralp = &GERMANIC_PLURAL;
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      *npluralsp = 2;
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    }
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}