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extern/hunspell/intl/plural-exp.h

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+/* Expression parsing and evaluation for plural form selection.
+   Copyright (C) 2000-2003, 2005-2007 Free Software Foundation, Inc.
+   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#ifndef _PLURAL_EXP_H
+#define _PLURAL_EXP_H
+
+#ifndef internal_function
+# define internal_function
+#endif
+
+#ifndef attribute_hidden
+# define attribute_hidden
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+enum expression_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.  */
+};
+
+/* This is the representation of the expressions to determine the
+   plural form.  */
+struct expression
+{
+  int nargs;			/* Number of arguments.  */
+  enum expression_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 libintl_gettext_free_exp
+# define PLURAL_PARSE libintl_gettextparse
+# define GERMANIC_PLURAL libintl_gettext_germanic_plural
+# define EXTRACT_PLURAL_EXPRESSION libintl_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 (struct expression *exp)
+     internal_function;
+extern int PLURAL_PARSE (void *arg);
+extern struct expression GERMANIC_PLURAL attribute_hidden;
+extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
+				       const struct expression **pluralp,
+				       unsigned long int *npluralsp)
+     internal_function;
+
+#if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
+extern unsigned long int plural_eval (const struct expression *pexp,
+				      unsigned long int n);
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PLURAL_EXP_H */