intl/plural-exp.h

   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 */