gnu/dist/texinfo/intl/plural-exp.h

   1 /*      $NetBSD$        */
   2
   3 /* Expression parsing and evaluation for plural form selection.
   4    Copyright (C) 2000-2003 Free Software Foundation, Inc.
   5    Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
   6
   7    This program is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU Library General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20    USA.  */
  21
  22 #ifndef _PLURAL_EXP_H
  23 #define _PLURAL_EXP_H
  24
  25 #ifndef internal_function
  26 # define internal_function
  27 #endif
  28
  29 #ifndef attribute_hidden
  30 # define attribute_hidden
  31 #endif
  32
  33
  34 /* This is the representation of the expressions to determine the
  35    plural form.  */
  36 struct expression
  37 {
  38   int nargs;                    /* Number of arguments.  */
  39   enum operator
  40   {
  41     /* Without arguments:  */
  42     var,                        /* The variable "n".  */
  43     num,                        /* Decimal number.  */
  44     /* Unary operators:  */
  45     lnot,                       /* Logical NOT.  */
  46     /* Binary operators:  */
  47     mult,                       /* Multiplication.  */
  48     divide,                     /* Division.  */
  49     module,                     /* Modulo operation.  */
  50     plus,                       /* Addition.  */
  51     minus,                      /* Subtraction.  */
  52     less_than,                  /* Comparison.  */
  53     greater_than,               /* Comparison.  */
  54     less_or_equal,              /* Comparison.  */
  55     greater_or_equal,           /* Comparison.  */
  56     equal,                      /* Comparison for equality.  */
  57     not_equal,                  /* Comparison for inequality.  */
  58     land,                       /* Logical AND.  */
  59     lor,                        /* Logical OR.  */
  60     /* Ternary operators:  */
  61     qmop                        /* Question mark operator.  */
  62   } operation;
  63   union
  64   {
  65     unsigned long int num;      /* Number value for `num'.  */
  66     struct expression *args[3]; /* Up to three arguments.  */
  67   } val;
  68 };
  69
  70 /* This is the data structure to pass information to the parser and get
  71    the result in a thread-safe way.  */
  72 struct parse_args
  73 {
  74   const char *cp;
  75   struct expression *res;
  76 };
  77
  78
  79 /* Names for the libintl functions are a problem.  This source code is used
  80    1. in the GNU C Library library,
  81    2. in the GNU libintl library,
  82    3. in the GNU gettext tools.
  83    The function names in each situation must be different, to allow for
  84    binary incompatible changes in 'struct expression'.  Furthermore,
  85    1. in the GNU C Library library, the names have a __ prefix,
  86    2.+3. in the GNU libintl library and in the GNU gettext tools, the names
  87          must follow ANSI C and not start with __.
  88    So we have to distinguish the three cases.  */
  89 #ifdef _LIBC
  90 # define FREE_EXPRESSION __gettext_free_exp
  91 # define PLURAL_PARSE __gettextparse
  92 # define GERMANIC_PLURAL __gettext_germanic_plural
  93 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
  94 #elif defined (IN_LIBINTL)
  95 # define FREE_EXPRESSION libintl_gettext_free_exp
  96 # define PLURAL_PARSE libintl_gettextparse
  97 # define GERMANIC_PLURAL libintl_gettext_germanic_plural
  98 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
  99 #else
 100 # define FREE_EXPRESSION free_plural_expression
 101 # define PLURAL_PARSE parse_plural_expression
 102 # define GERMANIC_PLURAL germanic_plural
 103 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
 104 #endif
 105
 106 extern void FREE_EXPRESSION (struct expression *exp)
 107      internal_function;
 108 extern int PLURAL_PARSE (void *arg);
 109 extern struct expression GERMANIC_PLURAL attribute_hidden;
 110 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
 111                                        struct expression **pluralp,
 112                                        unsigned long int *npluralsp)
 113      internal_function;
 114
 115 #if !defined (_LIBC) && !defined (IN_LIBINTL)
 116 extern unsigned long int plural_eval (struct expression *pexp,
 117                                       unsigned long int n);
 118 #endif
 119
 120 #endif /* _PLURAL_EXP_H */