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      1 /* Expression parsing and evaluation for plural form selection.
      2    Copyright (C) 2000-2003 Free Software Foundation, Inc.
      3    Written by Ulrich Drepper <drepper (at) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
     18    USA.  */
     19 
     20 #ifndef _PLURAL_EXP_H
     21 #define _PLURAL_EXP_H
     22 
     23 #ifndef internal_function
     24 # define internal_function
     25 #endif
     26 
     27 #ifndef attribute_hidden
     28 # define attribute_hidden
     29 #endif
     30 
     31 
     32 /* This is the representation of the expressions to determine the
     33    plural form.  */
     34 struct expression
     35 {
     36   int nargs;			/* Number of arguments.  */
     37   enum operator
     38   {
     39     /* Without arguments:  */
     40     var,			/* The variable "n".  */
     41     num,			/* Decimal number.  */
     42     /* Unary operators:  */
     43     lnot,			/* Logical NOT.  */
     44     /* Binary operators:  */
     45     mult,			/* Multiplication.  */
     46     divide,			/* Division.  */
     47     module,			/* Modulo operation.  */
     48     plus,			/* Addition.  */
     49     minus,			/* Subtraction.  */
     50     less_than,			/* Comparison.  */
     51     greater_than,		/* Comparison.  */
     52     less_or_equal,		/* Comparison.  */
     53     greater_or_equal,		/* Comparison.  */
     54     equal,			/* Comparison for equality.  */
     55     not_equal,			/* Comparison for inequality.  */
     56     land,			/* Logical AND.  */
     57     lor,			/* Logical OR.  */
     58     /* Ternary operators:  */
     59     qmop			/* Question mark operator.  */
     60   } operation;
     61   union
     62   {
     63     unsigned long int num;	/* Number value for `num'.  */
     64     struct expression *args[3];	/* Up to three arguments.  */
     65   } val;
     66 };
     67 
     68 /* This is the data structure to pass information to the parser and get
     69    the result in a thread-safe way.  */
     70 struct parse_args
     71 {
     72   const char *cp;
     73   struct expression *res;
     74 };
     75 
     76 
     77 /* Names for the libintl functions are a problem.  This source code is used
     78    1. in the GNU C Library library,
     79    2. in the GNU libintl library,
     80    3. in the GNU gettext tools.
     81    The function names in each situation must be different, to allow for
     82    binary incompatible changes in 'struct expression'.  Furthermore,
     83    1. in the GNU C Library library, the names have a __ prefix,
     84    2.+3. in the GNU libintl library and in the GNU gettext tools, the names
     85          must follow ANSI C and not start with __.
     86    So we have to distinguish the three cases.  */
     87 #ifdef _LIBC
     88 # define FREE_EXPRESSION __gettext_free_exp
     89 # define PLURAL_PARSE __gettextparse
     90 # define GERMANIC_PLURAL __gettext_germanic_plural
     91 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
     92 #elif defined (IN_LIBINTL)
     93 # define FREE_EXPRESSION libintl_gettext_free_exp
     94 # define PLURAL_PARSE libintl_gettextparse
     95 # define GERMANIC_PLURAL libintl_gettext_germanic_plural
     96 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
     97 #else
     98 # define FREE_EXPRESSION free_plural_expression
     99 # define PLURAL_PARSE parse_plural_expression
    100 # define GERMANIC_PLURAL germanic_plural
    101 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
    102 #endif
    103 
    104 extern void FREE_EXPRESSION (struct expression *exp)
    105      internal_function;
    106 extern int PLURAL_PARSE (void *arg);
    107 extern struct expression GERMANIC_PLURAL attribute_hidden;
    108 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
    109 				       struct expression **pluralp,
    110 				       unsigned long int *npluralsp)
    111      internal_function;
    112 
    113 #if !defined (_LIBC) && !defined (IN_LIBINTL)
    114 extern unsigned long int plural_eval (struct expression *pexp,
    115 				      unsigned long int n);
    116 #endif
    117 
    118 #endif /* _PLURAL_EXP_H */
    119