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 32extern "C" { 33#endif 34 35 36enum 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. */ 63struct 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. */ 76struct 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 110extern void FREE_EXPRESSION (struct expression *exp) 111 internal_function; 112extern int PLURAL_PARSE (void *arg); 113extern struct expression GERMANIC_PLURAL attribute_hidden; 114extern 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) 120extern 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 */ 130