1  /* Expression parsing and evaluation for plural form selection.
       2     Copyright (C) 2000-2020 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  #ifndef _PLURAL_EXP_H
      21  #define _PLURAL_EXP_H
      22  
      23  #include <plural-config.h>
      24  
      25  #ifndef PARAMS
      26  # if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
      27  #  define PARAMS(args) args
      28  # else
      29  #  define PARAMS(args) ()
      30  # endif
      31  #endif
      32  
      33  #ifndef internal_function
      34  # define internal_function
      35  #endif
      36  
      37  #ifndef attribute_hidden
      38  # define attribute_hidden
      39  #endif
      40  
      41  
      42  /* This is the representation of the expressions to determine the
      43     plural form.  */
      44  struct expression
      45  {
      46    int nargs;			/* Number of arguments.  */
      47    enum operator
      48    {
      49      /* Without arguments:  */
      50      var,			/* The variable "n".  */
      51      num,			/* Decimal number.  */
      52      /* Unary operators:  */
      53      lnot,			/* Logical NOT.  */
      54      /* Binary operators:  */
      55      mult,			/* Multiplication.  */
      56      divide,			/* Division.  */
      57      module,			/* Modulo operation.  */
      58      plus,			/* Addition.  */
      59      minus,			/* Subtraction.  */
      60      less_than,			/* Comparison.  */
      61      greater_than,		/* Comparison.  */
      62      less_or_equal,		/* Comparison.  */
      63      greater_or_equal,		/* Comparison.  */
      64      equal,			/* Comparison for equality.  */
      65      not_equal,			/* Comparison for inequality.  */
      66      land,			/* Logical AND.  */
      67      lor,			/* Logical OR.  */
      68      /* Ternary operators:  */
      69      qmop			/* Question mark operator.  */
      70    } operation;
      71    union
      72    {
      73      unsigned long int num;	/* Number value for `num'.  */
      74      struct expression *args[3];	/* Up to three arguments.  */
      75    } val;
      76  };
      77  
      78  /* This is the data structure to pass information to the parser and get
      79     the result in a thread-safe way.  */
      80  struct parse_args
      81  {
      82    const char *cp;
      83    struct expression *res;
      84  };
      85  
      86  
      87  /* Names for the libintl functions are a problem.  This source code is used
      88     1. in the GNU C Library library,
      89     2. in the GNU libintl library,
      90     3. in the GNU gettext tools.
      91     The function names in each situation must be different, to allow for
      92     binary incompatible changes in 'struct expression'.  Furthermore,
      93     1. in the GNU C Library library, the names have a __ prefix,
      94     2.+3. in the GNU libintl library and in the GNU gettext tools, the names
      95           must follow ANSI C and not start with __.
      96     So we have to distinguish the three cases.  */
      97  #ifdef _LIBC
      98  # define FREE_EXPRESSION __gettext_free_exp
      99  # define PLURAL_PARSE __gettextparse
     100  # define GERMANIC_PLURAL __gettext_germanic_plural
     101  # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
     102  #elif defined (IN_LIBINTL)
     103  # define FREE_EXPRESSION libintl_gettext_free_exp
     104  # define PLURAL_PARSE libintl_gettextparse
     105  # define GERMANIC_PLURAL libintl_gettext_germanic_plural
     106  # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
     107  #else
     108  # define FREE_EXPRESSION free_plural_expression
     109  # define PLURAL_PARSE parse_plural_expression
     110  # define GERMANIC_PLURAL germanic_plural
     111  # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
     112  #endif
     113  
     114  extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
     115       internal_function;
     116  #ifdef USE_BISON3
     117  extern int PLURAL_PARSE PARAMS ((struct parse_args *arg));
     118  #else
     119  extern int PLURAL_PARSE PARAMS ((void *arg));
     120  #endif
     121  extern struct expression GERMANIC_PLURAL attribute_hidden;
     122  extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
     123  					       struct expression **pluralp,
     124  					       unsigned long int *npluralsp))
     125       internal_function;
     126  
     127  #if !defined (_LIBC) && !defined (IN_LIBINTL)
     128  extern unsigned long int plural_eval PARAMS ((struct expression *pexp,
     129  					      unsigned long int n));
     130  #endif
     131  
     132  #endif /* _PLURAL_EXP_H */