1 /* Expression parsing and evaluation for plural form selection. 2 Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. 3 Written by Ulrich Drepper <drepper (at) 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 PARAMS 24 # if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES 25 # define PARAMS(args) args 26 # else 27 # define PARAMS(args) () 28 # endif 29 #endif 30 31 #ifndef internal_function 32 # define internal_function 33 #endif 34 35 #ifndef attribute_hidden 36 # define attribute_hidden 37 #endif 38 39 40 /* This is the representation of the expressions to determine the 41 plural form. */ 42 struct expression 43 { 44 int nargs; /* Number of arguments. */ 45 enum operator 46 { 47 /* Without arguments: */ 48 var, /* The variable "n". */ 49 num, /* Decimal number. */ 50 /* Unary operators: */ 51 lnot, /* Logical NOT. */ 52 /* Binary operators: */ 53 mult, /* Multiplication. */ 54 divide, /* Division. */ 55 module, /* Modulo operation. */ 56 plus, /* Addition. */ 57 minus, /* Subtraction. */ 58 less_than, /* Comparison. */ 59 greater_than, /* Comparison. */ 60 less_or_equal, /* Comparison. */ 61 greater_or_equal, /* Comparison. */ 62 equal, /* Comparison for equality. */ 63 not_equal, /* Comparison for inequality. */ 64 land, /* Logical AND. */ 65 lor, /* Logical OR. */ 66 /* Ternary operators: */ 67 qmop /* Question mark operator. */ 68 } operation; 69 union 70 { 71 unsigned long int num; /* Number value for `num'. */ 72 struct expression *args[3]; /* Up to three arguments. */ 73 } val; 74 }; 75 76 /* This is the data structure to pass information to the parser and get 77 the result in a thread-safe way. */ 78 struct parse_args 79 { 80 const char *cp; 81 struct expression *res; 82 }; 83 84 85 /* Names for the libintl functions are a problem. This source code is used 86 1. in the GNU C Library library, 87 2. in the GNU libintl library, 88 3. in the GNU gettext tools. 89 The function names in each situation must be different, to allow for 90 binary incompatible changes in 'struct expression'. Furthermore, 91 1. in the GNU C Library library, the names have a __ prefix, 92 2.+3. in the GNU libintl library and in the GNU gettext tools, the names 93 must follow ANSI C and not start with __. 94 So we have to distinguish the three cases. */ 95 #ifdef _LIBC 96 # define FREE_EXPRESSION __gettext_free_exp 97 # define PLURAL_PARSE __gettextparse 98 # define GERMANIC_PLURAL __gettext_germanic_plural 99 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural 100 #elif defined (IN_LIBINTL) 101 # define FREE_EXPRESSION libintl_gettext_free_exp 102 # define PLURAL_PARSE libintl_gettextparse 103 # define GERMANIC_PLURAL libintl_gettext_germanic_plural 104 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural 105 #else 106 # define FREE_EXPRESSION free_plural_expression 107 # define PLURAL_PARSE parse_plural_expression 108 # define GERMANIC_PLURAL germanic_plural 109 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression 110 #endif 111 112 extern void FREE_EXPRESSION PARAMS ((struct expression *exp)) 113 internal_function; 114 extern int PLURAL_PARSE PARAMS ((void *arg)); 115 extern struct expression GERMANIC_PLURAL attribute_hidden; 116 extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry, 117 struct expression **pluralp, 118 unsigned long int *npluralsp)) 119 internal_function; 120 121 #if !defined (_LIBC) && !defined (IN_LIBINTL) 122 extern unsigned long int plural_eval PARAMS ((struct expression *pexp, 123 unsigned long int n)); 124 #endif 125 126 #endif /* _PLURAL_EXP_H */ 127
