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/* Expression parsing and evaluation for plural form selection.
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   Copyright (C) 2000-2003 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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#ifndef _PLURAL_EXP_H
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#define _PLURAL_EXP_H
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#ifndef internal_function
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# define internal_function
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#endif
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#ifndef attribute_hidden
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# define attribute_hidden
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#endif
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/* This is the representation of the expressions to determine the
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   plural form.  */
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struct expression
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{
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  int nargs;                        /* Number of arguments.  */
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  enum operator
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  {
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    /* Without arguments:  */
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    var,                        /* The variable "n".  */
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    num,                        /* Decimal number.  */
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    /* Unary operators:  */
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    lnot,                        /* Logical NOT.  */
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    /* Binary operators:  */
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    mult,                        /* Multiplication.  */
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    divide,                        /* Division.  */
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    module,                        /* Modulo operation.  */
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    plus,                        /* Addition.  */
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    minus,                        /* Subtraction.  */
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    less_than,                        /* Comparison.  */
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    greater_than,                /* Comparison.  */
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    less_or_equal,                /* Comparison.  */
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    greater_or_equal,                /* Comparison.  */
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    equal,                        /* Comparison for equality.  */
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    not_equal,                        /* Comparison for inequality.  */
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    land,                        /* Logical AND.  */
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    lor,                        /* Logical OR.  */
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    /* Ternary operators:  */
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    qmop                        /* Question mark operator.  */
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  } operation;
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  union
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  {
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    unsigned long int num;        /* Number value for `num'.  */
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    struct expression *args[3];        /* Up to three arguments.  */
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  } val;
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};
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/* This is the data structure to pass information to the parser and get
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   the result in a thread-safe way.  */
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struct parse_args
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{
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  const char *cp;
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  struct expression *res;
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};
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/* Names for the libintl functions are a problem.  This source code is used
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   1. in the GNU C Library library,
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   2. in the GNU libintl library,
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   3. in the GNU gettext tools.
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   The function names in each situation must be different, to allow for
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   binary incompatible changes in 'struct expression'.  Furthermore,
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   1. in the GNU C Library library, the names have a __ prefix,
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   2.+3. in the GNU libintl library and in the GNU gettext tools, the names
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         must follow ANSI C and not start with __.
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   So we have to distinguish the three cases.  */
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#ifdef _LIBC
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# define FREE_EXPRESSION __gettext_free_exp
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# define PLURAL_PARSE __gettextparse
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# define GERMANIC_PLURAL __gettext_germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
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#elif defined (IN_LIBINTL)
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# define FREE_EXPRESSION libintl_gettext_free_exp
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# define PLURAL_PARSE libintl_gettextparse
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# define GERMANIC_PLURAL libintl_gettext_germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
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#else
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# define FREE_EXPRESSION free_plural_expression
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# define PLURAL_PARSE parse_plural_expression
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# define GERMANIC_PLURAL germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
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#endif
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extern void FREE_EXPRESSION (struct expression *exp)
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     internal_function;
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extern int PLURAL_PARSE (void *arg);
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extern struct expression GERMANIC_PLURAL attribute_hidden;
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extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
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                                       struct expression **pluralp,
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                                       unsigned long int *npluralsp)
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     internal_function;
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#if !defined (_LIBC) && !defined (IN_LIBINTL)
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extern unsigned long int plural_eval (struct expression *pexp,
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                                      unsigned long int n);
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#endif
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#endif /* _PLURAL_EXP_H */