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+/* Expression parsing and evaluation for plural form selection.
+ Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+ Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _PLURAL_EXP_H
+#define _PLURAL_EXP_H
+
+#ifndef PARAMS
+# if __STDC__
+# define PARAMS(args) args
+# else
+# define PARAMS(args) ()
+# endif
+#endif
+
+#ifndef internal_function
+# define internal_function
+#endif
+
+
+/* This is the representation of the expressions to determine the
+ plural form. */
+struct expression
+{
+ int nargs; /* Number of arguments. */
+ enum operator
+ {
+ /* Without arguments: */
+ var, /* The variable "n". */
+ num, /* Decimal number. */
+ /* Unary operators: */
+ lnot, /* Logical NOT. */
+ /* Binary operators: */
+ mult, /* Multiplication. */
+ divide, /* Division. */
+ module, /* Modulo operation. */
+ plus, /* Addition. */
+ minus, /* Subtraction. */
+ less_than, /* Comparison. */
+ greater_than, /* Comparison. */
+ less_or_equal, /* Comparison. */
+ greater_or_equal, /* Comparison. */
+ equal, /* Comparison for equality. */
+ not_equal, /* Comparison for inequality. */
+ land, /* Logical AND. */
+ lor, /* Logical OR. */
+ /* Ternary operators: */
+ qmop /* Question mark operator. */
+ } operation;
+ union
+ {
+ unsigned long int num; /* Number value for `num'. */
+ struct expression *args[3]; /* Up to three arguments. */
+ } val;
+};
+
+/* This is the data structure to pass information to the parser and get
+ the result in a thread-safe way. */
+struct parse_args
+{
+ const char *cp;
+ struct expression *res;
+};
+
+
+/* Names for the libintl functions are a problem. This source code is used
+ 1. in the GNU C Library library,
+ 2. in the GNU libintl library,
+ 3. in the GNU gettext tools.
+ The function names in each situation must be different, to allow for
+ binary incompatible changes in 'struct expression'. Furthermore,
+ 1. in the GNU C Library library, the names have a __ prefix,
+ 2.+3. in the GNU libintl library and in the GNU gettext tools, the names
+ must follow ANSI C and not start with __.
+ So we have to distinguish the three cases. */
+#ifdef _LIBC
+# define FREE_EXPRESSION __gettext_free_exp
+# define PLURAL_PARSE __gettextparse
+# define GERMANIC_PLURAL __gettext_germanic_plural
+# define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
+#elif defined (IN_LIBINTL)
+# define FREE_EXPRESSION gettext_free_exp__
+# define PLURAL_PARSE gettextparse__
+# define GERMANIC_PLURAL gettext_germanic_plural__
+# define EXTRACT_PLURAL_EXPRESSION gettext_extract_plural__
+#else
+# define FREE_EXPRESSION free_plural_expression
+# define PLURAL_PARSE parse_plural_expression
+# define GERMANIC_PLURAL germanic_plural
+# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
+#endif
+
+extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
+ internal_function;
+extern int PLURAL_PARSE PARAMS ((void *arg));
+extern struct expression GERMANIC_PLURAL;
+extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
+ struct expression **pluralp,
+ unsigned long int *npluralsp))
+ internal_function;
+
+#endif /* _PLURAL_EXP_H */