1: /* Expression parsing and evaluation for plural form selection.
    2:    Copyright (C) 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc.
    3:    Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
    4:    This file is part of the GNU C Library.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public
    8:    License as published by the Free Software Foundation; either
    9:    version 2.1 of the License, or (at your option) any later version.
   10: 
   11:    The GNU C Library is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:    Lesser General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU Lesser General Public
   17:    License along with the GNU C Library; if not, write to the Free
   18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   19:    02111-1307 USA.  */
   20: 
   21: #ifndef _PLURAL_EXP_H
   22: #define _PLURAL_EXP_H
   23: 
   24: #ifndef PARAMS
   25: # if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
   26: #  define PARAMS(args) args
   27: # else
   28: #  define PARAMS(args) ()
   29: # endif
   30: #endif
   31: 
   32: #ifndef internal_function
   33: # define internal_function
   34: #endif
   35: 
   36: #ifndef attribute_hidden
   37: # define attribute_hidden
   38: #endif
   39: 
   40: 
   41: /* This is the representation of the expressions to determine the
   42:    plural form.  */
   43: struct expression
   44: {
   45:   int nargs;                    /* Number of arguments.  */
   46:   enum operator
   47:   {
   48:     /* Without arguments:  */
   49:     var,                        /* The variable "n".  */
   50:     num,                        /* Decimal number.  */
   51:     /* Unary operators:  */
   52:     lnot,                       /* Logical NOT.  */
   53:     /* Binary operators:  */
   54:     mult,                       /* Multiplication.  */
   55:     divide,                     /* Division.  */
   56:     module,                     /* Modulo operation.  */
   57:     plus,                       /* Addition.  */
   58:     minus,                      /* Subtraction.  */
   59:     less_than,                  /* Comparison.  */
   60:     greater_than,               /* Comparison.  */
   61:     less_or_equal,              /* Comparison.  */
   62:     greater_or_equal,           /* Comparison.  */
   63:     equal,                      /* Comparison for equality.  */
   64:     not_equal,                  /* Comparison for inequality.  */
   65:     land,                       /* Logical AND.  */
   66:     lor,                        /* Logical OR.  */
   67:     /* Ternary operators:  */
   68:     qmop                        /* Question mark operator.  */
   69:   } operation;
   70:   union
   71:   {
   72:     unsigned long int num;      /* Number value for `num'.  */
   73:     struct expression *args[3]; /* Up to three arguments.  */
   74:   } val;
   75: };
   76: 
   77: /* This is the data structure to pass information to the parser and get
   78:    the result in a thread-safe way.  */
   79: struct parse_args
   80: {
   81:   const char *cp;
   82:   struct expression *res;
   83: };
   84: 
   85: 
   86: /* Names for the libintl functions are a problem.  This source code is used
   87:    1. in the GNU C Library library,
   88:    2. in the GNU libintl library,
   89:    3. in the GNU gettext tools.
   90:    The function names in each situation must be different, to allow for
   91:    binary incompatible changes in 'struct expression'.  Furthermore,
   92:    1. in the GNU C Library library, the names have a __ prefix,
   93:    2.+3. in the GNU libintl library and in the GNU gettext tools, the names
   94:          must follow ANSI C and not start with __.
   95:    So we have to distinguish the three cases.  */
   96: #ifdef _LIBC
   97: # define FREE_EXPRESSION __gettext_free_exp
   98: # define PLURAL_PARSE __gettextparse
   99: # define GERMANIC_PLURAL __gettext_germanic_plural
  100: # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
  101: #elif defined (IN_LIBINTL)
  102: # define FREE_EXPRESSION libintl_gettext_free_exp
  103: # define PLURAL_PARSE libintl_gettextparse
  104: # define GERMANIC_PLURAL libintl_gettext_germanic_plural
  105: # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
  106: #else
  107: # define FREE_EXPRESSION free_plural_expression
  108: # define PLURAL_PARSE parse_plural_expression
  109: # define GERMANIC_PLURAL germanic_plural
  110: # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
  111: #endif
  112: 
  113: extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
  114:      internal_function;
  115: extern int PLURAL_PARSE PARAMS ((void *arg));
  116: extern const struct expression GERMANIC_PLURAL attribute_hidden;
  117: extern void EXTRACT_PLURAL_EXPRESSION PARAMS
  118:   ((const char *nullentry, const struct expression **pluralp,
  119:     unsigned long int *npluralsp)) internal_function;
  120: 
  121: #if !defined (_LIBC) && !defined (IN_LIBINTL)
  122: extern unsigned long int plural_eval PARAMS ((const struct expression *pexp,
  123:                                               unsigned long int n));
  124: #endif
  125: 
  126: #endif /* _PLURAL_EXP_H */