| 1 | /* Expression parsing and evaluation for plural form selection.
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| 2 | Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
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| 3 | Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
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| 4 | This file is part of the GNU C Library.
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| 5 |
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| 6 | The GNU C Library is free software; you can redistribute it and/or
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| 7 | modify it under the terms of the GNU Lesser General Public
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| 8 | License as published by the Free Software Foundation; either
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| 9 | version 2.1 of the License, or (at your option) any later version.
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| 10 |
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| 11 | The GNU C Library is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | Lesser General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU Lesser General Public
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| 17 | License along with the GNU C Library; if not, write to the Free
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| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 19 | 02111-1307 USA. */
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| 20 |
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| 21 | #ifndef _PLURAL_EXP_H
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| 22 | #define _PLURAL_EXP_H
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| 23 |
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| 24 | #ifndef PARAMS
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| 25 | # if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
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| 26 | # define PARAMS(args) args
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| 27 | # else
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| 28 | # define PARAMS(args) ()
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| 29 | # endif
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| 30 | #endif
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| 31 |
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| 32 | #ifndef internal_function
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| 33 | # define internal_function
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| 34 | #endif
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| 35 |
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| 36 | #ifndef attribute_hidden
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| 37 | # define attribute_hidden
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| 38 | #endif
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| 39 |
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| 40 |
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| 41 | /* This is the representation of the expressions to determine the
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| 42 | plural form. */
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| 43 | struct expression
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| 44 | {
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| 45 | int nargs; /* Number of arguments. */
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| 46 | enum operator
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| 47 | {
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| 48 | /* Without arguments: */
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| 49 | var, /* The variable "n". */
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| 50 | num, /* Decimal number. */
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| 51 | /* Unary operators: */
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| 52 | lnot, /* Logical NOT. */
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| 53 | /* Binary operators: */
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| 54 | mult, /* Multiplication. */
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| 55 | divide, /* Division. */
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| 56 | module, /* Modulo operation. */
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| 57 | plus, /* Addition. */
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| 58 | minus, /* Subtraction. */
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| 59 | less_than, /* Comparison. */
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| 60 | greater_than, /* Comparison. */
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| 61 | less_or_equal, /* Comparison. */
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| 62 | greater_or_equal, /* Comparison. */
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| 63 | equal, /* Comparison for equality. */
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| 64 | not_equal, /* Comparison for inequality. */
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| 65 | land, /* Logical AND. */
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| 66 | lor, /* Logical OR. */
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| 67 | /* Ternary operators: */
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| 68 | qmop /* Question mark operator. */
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| 69 | } operation;
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| 70 | union
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| 71 | {
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| 72 | unsigned long int num; /* Number value for `num'. */
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| 73 | struct expression *args[3]; /* Up to three arguments. */
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| 74 | } val;
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| 75 | };
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| 76 |
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| 77 | /* This is the data structure to pass information to the parser and get
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| 78 | the result in a thread-safe way. */
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| 79 | struct parse_args
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| 80 | {
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| 81 | const char *cp;
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| 82 | struct expression *res;
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| 83 | };
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| 84 |
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| 85 |
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| 86 | /* Names for the libintl functions are a problem. This source code is used
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| 87 | 1. in the GNU C Library library,
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| 88 | 2. in the GNU libintl library,
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| 89 | 3. in the GNU gettext tools.
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| 90 | The function names in each situation must be different, to allow for
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| 91 | binary incompatible changes in 'struct expression'. Furthermore,
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| 92 | 1. in the GNU C Library library, the names have a __ prefix,
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| 93 | 2.+3. in the GNU libintl library and in the GNU gettext tools, the names
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| 94 | must follow ANSI C and not start with __.
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| 95 | So we have to distinguish the three cases. */
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| 96 | #ifdef _LIBC
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| 97 | # define FREE_EXPRESSION __gettext_free_exp
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| 98 | # define PLURAL_PARSE __gettextparse
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| 99 | # define GERMANIC_PLURAL __gettext_germanic_plural
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| 100 | # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
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| 101 | #elif defined (IN_LIBINTL)
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| 102 | # define FREE_EXPRESSION libintl_gettext_free_exp
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| 103 | # define PLURAL_PARSE libintl_gettextparse
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| 104 | # define GERMANIC_PLURAL libintl_gettext_germanic_plural
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| 105 | # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
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| 106 | #else
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| 107 | # define FREE_EXPRESSION free_plural_expression
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| 108 | # define PLURAL_PARSE parse_plural_expression
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| 109 | # define GERMANIC_PLURAL germanic_plural
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| 110 | # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
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| 111 | #endif
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| 112 |
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| 113 | extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
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| 114 | internal_function;
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| 115 | extern int PLURAL_PARSE PARAMS ((void *arg));
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| 116 | extern struct expression GERMANIC_PLURAL attribute_hidden;
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| 117 | extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
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| 118 | struct expression **pluralp,
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| 119 | unsigned long int *npluralsp))
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| 120 | internal_function;
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| 121 |
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| 122 | #if !defined (_LIBC) && !defined (IN_LIBINTL)
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| 123 | extern unsigned long int plural_eval PARAMS ((struct expression *pexp,
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| 124 | unsigned long int n));
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| 125 | #endif
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| 126 |
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| 127 | #endif /* _PLURAL_EXP_H */
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