mingw/share/gettext/intl/plural-exp.h

   1 /* Expression parsing and evaluation for plural form selection.
   2    Copyright (C) 2000-2003, 2005-2007 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 #ifndef internal_function
  24 # define internal_function
  25 #endif
  26
  27 #ifndef attribute_hidden
  28 # define attribute_hidden
  29 #endif
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35
  36 enum expression_operator
  37 {
  38   /* Without arguments:  */
  39   var,                          /* The variable "n".  */
  40   num,                          /* Decimal number.  */
  41   /* Unary operators:  */
  42   lnot,                         /* Logical NOT.  */
  43   /* Binary operators:  */
  44   mult,                         /* Multiplication.  */
  45   divide,                       /* Division.  */
  46   module,                       /* Modulo operation.  */
  47   plus,                         /* Addition.  */
  48   minus,                        /* Subtraction.  */
  49   less_than,                    /* Comparison.  */
  50   greater_than,                 /* Comparison.  */
  51   less_or_equal,                /* Comparison.  */
  52   greater_or_equal,             /* Comparison.  */
  53   equal,                        /* Comparison for equality.  */
  54   not_equal,                    /* Comparison for inequality.  */
  55   land,                         /* Logical AND.  */
  56   lor,                          /* Logical OR.  */
  57   /* Ternary operators:  */
  58   qmop                          /* Question mark operator.  */
  59 };
  60
  61 /* This is the representation of the expressions to determine the
  62    plural form.  */
  63 struct expression
  64 {
  65   int nargs;                    /* Number of arguments.  */
  66   enum expression_operator operation;
  67   union
  68   {
  69     unsigned long int num;      /* Number value for `num'.  */
  70     struct expression *args[3]; /* Up to three arguments.  */
  71   } val;
  72 };
  73
  74 /* This is the data structure to pass information to the parser and get
  75    the result in a thread-safe way.  */
  76 struct parse_args
  77 {
  78   const char *cp;
  79   struct expression *res;
  80 };
  81
  82
  83 /* Names for the libintl functions are a problem.  This source code is used
  84    1. in the GNU C Library library,
  85    2. in the GNU libintl library,
  86    3. in the GNU gettext tools.
  87    The function names in each situation must be different, to allow for
  88    binary incompatible changes in 'struct expression'.  Furthermore,
  89    1. in the GNU C Library library, the names have a __ prefix,
  90    2.+3. in the GNU libintl library and in the GNU gettext tools, the names
  91          must follow ANSI C and not start with __.
  92    So we have to distinguish the three cases.  */
  93 #ifdef _LIBC
  94 # define FREE_EXPRESSION __gettext_free_exp
  95 # define PLURAL_PARSE __gettextparse
  96 # define GERMANIC_PLURAL __gettext_germanic_plural
  97 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
  98 #elif defined (IN_LIBINTL)
  99 # define FREE_EXPRESSION libintl_gettext_free_exp
 100 # define PLURAL_PARSE libintl_gettextparse
 101 # define GERMANIC_PLURAL libintl_gettext_germanic_plural
 102 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
 103 #else
 104 # define FREE_EXPRESSION free_plural_expression
 105 # define PLURAL_PARSE parse_plural_expression
 106 # define GERMANIC_PLURAL germanic_plural
 107 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
 108 #endif
 109
 110 extern void FREE_EXPRESSION (struct expression *exp)
 111      internal_function;
 112 extern int PLURAL_PARSE (void *arg);
 113 extern struct expression GERMANIC_PLURAL attribute_hidden;
 114 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
 115                                        const struct expression **pluralp,
 116                                        unsigned long int *npluralsp)
 117      internal_function;
 118
 119 #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
 120 extern unsigned long int plural_eval (const struct expression *pexp,
 121                                       unsigned long int n);
 122 #endif
 123
 124
 125 #ifdef __cplusplus
 126 }
 127 #endif
 128
 129 #endif /* _PLURAL_EXP_H */