| 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@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 */ |