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128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/* Expression parsing and evaluation for plural form selection.
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Copyright (C) 2000-2003, 2005-2007 Free Software Foundation, Inc.
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Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef _PLURAL_EXP_H
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#define _PLURAL_EXP_H
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#ifndef internal_function
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# define internal_function
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#endif
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#ifndef attribute_hidden
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# define attribute_hidden
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum expression_operator
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{
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/* Without arguments: */
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var, /* The variable "n". */
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num, /* Decimal number. */
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/* Unary operators: */
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lnot, /* Logical NOT. */
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/* Binary operators: */
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mult, /* Multiplication. */
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divide, /* Division. */
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module, /* Modulo operation. */
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plus, /* Addition. */
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minus, /* Subtraction. */
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less_than, /* Comparison. */
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greater_than, /* Comparison. */
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less_or_equal, /* Comparison. */
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greater_or_equal, /* Comparison. */
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equal, /* Comparison for equality. */
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not_equal, /* Comparison for inequality. */
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land, /* Logical AND. */
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lor, /* Logical OR. */
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/* Ternary operators: */
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qmop /* Question mark operator. */
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};
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/* This is the representation of the expressions to determine the
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plural form. */
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struct expression
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{
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int nargs; /* Number of arguments. */
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enum expression_operator operation;
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union
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{
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unsigned long int num; /* Number value for `num'. */
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struct expression *args[3]; /* Up to three arguments. */
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} val;
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};
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/* This is the data structure to pass information to the parser and get
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the result in a thread-safe way. */
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struct parse_args
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{
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const char *cp;
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struct expression *res;
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};
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/* Names for the libintl functions are a problem. This source code is used
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1. in the GNU C Library library,
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2. in the GNU libintl library,
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3. in the GNU gettext tools.
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The function names in each situation must be different, to allow for
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binary incompatible changes in 'struct expression'. Furthermore,
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1. in the GNU C Library library, the names have a __ prefix,
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2.+3. in the GNU libintl library and in the GNU gettext tools, the names
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must follow ANSI C and not start with __.
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So we have to distinguish the three cases. */
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#ifdef _LIBC
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# define FREE_EXPRESSION __gettext_free_exp
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# define PLURAL_PARSE __gettextparse
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# define GERMANIC_PLURAL __gettext_germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
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#elif defined (IN_LIBINTL)
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# define FREE_EXPRESSION libintl_gettext_free_exp
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# define PLURAL_PARSE libintl_gettextparse
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# define GERMANIC_PLURAL libintl_gettext_germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
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#else
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# define FREE_EXPRESSION free_plural_expression
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# define PLURAL_PARSE parse_plural_expression
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# define GERMANIC_PLURAL germanic_plural
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# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
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#endif
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extern void FREE_EXPRESSION (struct expression *exp)
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internal_function;
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extern int PLURAL_PARSE (struct parse_args *arg);
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extern struct expression GERMANIC_PLURAL attribute_hidden;
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extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
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const struct expression **pluralp,
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unsigned long int *npluralsp)
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internal_function;
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#if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
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extern unsigned long int plural_eval (const struct expression *pexp,
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unsigned long int n);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _PLURAL_EXP_H */
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