1 /* Expression parsing and evaluation for plural form selection. 2 Copyright (C) 2000-2022 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 6 it under the terms of the GNU Lesser General Public License as published by 7 the Free Software Foundation; either version 2.1 of the License, or 8 (at your option) 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 13 GNU Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _PLURAL_EXP_H 19 #define _PLURAL_EXP_H 20 21 #ifndef attribute_hidden 22 # define attribute_hidden 23 #endif 24 25 #ifdef __cplusplus 26 extern "C" { 27 #endif 28 29 30 enum expression_operator 31 { 32 /* Without arguments: */ 33 var, /* The variable "n". */ 34 num, /* Decimal number. */ 35 /* Unary operators: */ 36 lnot, /* Logical NOT. */ 37 /* Binary operators: */ 38 mult, /* Multiplication. */ 39 divide, /* Division. */ 40 module, /* Modulo operation. */ 41 plus, /* Addition. */ 42 minus, /* Subtraction. */ 43 less_than, /* Comparison. */ 44 greater_than, /* Comparison. */ 45 less_or_equal, /* Comparison. */ 46 greater_or_equal, /* Comparison. */ 47 equal, /* Comparison for equality. */ 48 not_equal, /* Comparison for inequality. */ 49 land, /* Logical AND. */ 50 lor, /* Logical OR. */ 51 /* Ternary operators: */ 52 qmop /* Question mark operator. */ 53 }; 54 55 /* This is the representation of the expressions to determine the 56 plural form. */ 57 struct expression 58 { 59 int nargs; /* Number of arguments. */ 60 enum expression_operator 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) attribute_hidden; 105 extern int PLURAL_PARSE (struct parse_args *arg); 106 extern const struct expression GERMANIC_PLURAL attribute_hidden; 107 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry, 108 const struct expression **pluralp, 109 unsigned long int *npluralsp) 110 attribute_hidden; 111 112 #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE) 113 extern unsigned long int plural_eval (const struct expression *pexp, 114 unsigned long int n); 115 #endif 116 117 118 #ifdef __cplusplus 119 } 120 #endif 121 122 #endif /* _PLURAL_EXP_H */ 123