lib/intl/plural-exp.h

   1 /* plural-exp.h - defines for expression parsing and evaluation for plural form selection. */
   2
   3 /* Copyright (C) 2000, 2001, 2002, 2005-2009 Free Software Foundation, Inc.
   4    Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    This file is part of GNU Bush.
   7
   8    Bush is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Bush is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #ifndef _PLURAL_EXP_H
  23 #define _PLURAL_EXP_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 extern int PLURAL_PARSE PARAMS ((void *arg));
 117 extern struct expression GERMANIC_PLURAL attribute_hidden;
 118 extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
 119                                                struct expression **pluralp,
 120                                                unsigned long int *npluralsp))
 121      internal_function;
 122
 123 #if !defined (_LIBC) && !defined (IN_LIBINTL)
 124 extern unsigned long int plural_eval PARAMS ((struct expression *pexp,
 125                                               unsigned long int n));
 126 #endif
 127
 128 #endif /* _PLURAL_EXP_H */