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