1 /* Expression parsing and evaluation for plural form selection. 2 Copyright (C) 2000-2016, 2019 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 internal_function 22 # define internal_function 23 #endif 24 25 #ifndef attribute_hidden 26 # define attribute_hidden 27 #endif 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 34 enum expression_operator 35 { 36 /* Without arguments: */ 37 var, /* The variable "n". */ 38 num, /* Decimal number. */ 39 /* Unary operators: */ 40 lnot, /* Logical NOT. */ 41 /* Binary operators: */ 42 mult, /* Multiplication. */ 43 divide, /* Division. */ 44 module, /* Modulo operation. */ 45 plus, /* Addition. */ 46 minus, /* Subtraction. */ 47 less_than, /* Comparison. */ 48 greater_than, /* Comparison. */ 49 less_or_equal, /* Comparison. */ 50 greater_or_equal, /* Comparison. */ 51 equal, /* Comparison for equality. */ 52 not_equal, /* Comparison for inequality. */ 53 land, /* Logical AND. */ 54 lor, /* Logical OR. */ 55 /* Ternary operators: */ 56 qmop /* Question mark operator. */ 57 }; 58 59 /* This is the representation of the expressions to determine the 60 plural form. */ 61 struct expression 62 { 63 int nargs; /* Number of arguments. */ 64 enum expression_operator operation; 65 union 66 { 67 unsigned long int num; /* Number value for `num'. */ 68 struct expression *args[3]; /* Up to three arguments. */ 69 } val; 70 }; 71 72 /* This is the data structure to pass information to the parser and get 73 the result in a thread-safe way. */ 74 struct parse_args 75 { 76 const char *cp; 77 struct expression *res; 78 }; 79 80 81 /* Names for the libintl functions are a problem. This source code is used 82 1. in the GNU C Library library, 83 2. in the GNU libintl library, 84 3. in the GNU gettext tools. 85 The function names in each situation must be different, to allow for 86 binary incompatible changes in 'struct expression'. Furthermore, 87 1. in the GNU C Library library, the names have a __ prefix, 88 2.+3. in the GNU libintl library and in the GNU gettext tools, the names 89 must follow ANSI C and not start with __. 90 So we have to distinguish the three cases. */ 91 #ifdef _LIBC 92 # define FREE_EXPRESSION __gettext_free_exp 93 # define PLURAL_PARSE __gettextparse 94 # define GERMANIC_PLURAL __gettext_germanic_plural 95 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural 96 #elif defined (IN_LIBINTL) 97 # define FREE_EXPRESSION libintl_gettext_free_exp 98 # define PLURAL_PARSE libintl_gettextparse 99 # define GERMANIC_PLURAL libintl_gettext_germanic_plural 100 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural 101 #else 102 # define FREE_EXPRESSION free_plural_expression 103 # define PLURAL_PARSE parse_plural_expression 104 # define GERMANIC_PLURAL germanic_plural 105 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression 106 #endif 107 108 #if (defined __GNUC__ && !(defined __APPLE_CC_ && __APPLE_CC__ > 1) \ 109 && !defined __cplusplus) \ 110 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L \ 111 && !defined __HP_cc) \ 112 || (defined __SUNPRO_C && 0x560 <= __SUNPRO_C \ 113 && !(defined __STDC__ && __STDC__ == 1)) 114 # define HAVE_STRUCT_INITIALIZER 1 115 #else 116 # define HAVE_STRUCT_INITIALIZER 0 117 #endif 118 119 extern void FREE_EXPRESSION (struct expression *exp) 120 internal_function; 121 extern int PLURAL_PARSE (struct parse_args *arg); 122 #if HAVE_STRUCT_INITIALIZER 123 extern const struct expression GERMANIC_PLURAL attribute_hidden; 124 #else 125 extern struct expression GERMANIC_PLURAL attribute_hidden; 126 #endif 127 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry, 128 const struct expression **pluralp, 129 unsigned long int *npluralsp) 130 internal_function; 131 132 #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE) 133 extern unsigned long int plural_eval (const struct expression *pexp, 134 unsigned long int n); 135 #endif 136 137 138 #ifdef __cplusplus 139 } 140 #endif 141 142 #endif /* _PLURAL_EXP_H */ 143