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. */ 44struct 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. */ 80struct 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 114extern void FREE_EXPRESSION PARAMS ((struct expression *exp)) 115 internal_function; 116#ifdef USE_BISON3 117extern int PLURAL_PARSE PARAMS ((struct parse_args *arg)); 118#else 119extern int PLURAL_PARSE PARAMS ((void *arg)); 120#endif 121extern struct expression GERMANIC_PLURAL attribute_hidden; 122extern 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) 128extern unsigned long int plural_eval PARAMS ((struct expression *pexp, 129 unsigned long int n)); 130#endif 131 132#endif /* _PLURAL_EXP_H */ 133