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/* Expression parsing and evaluation for plural form selection. |
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Copyright (C) 2000-2003 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 it |
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under the terms of the GNU Library General Public License as published |
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by the Free Software Foundation; either version 2, or (at your option) |
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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 GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public |
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License along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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USA. */ |
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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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/* 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 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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} 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 (void *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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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) |
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extern unsigned long int plural_eval (struct expression *pexp, |
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unsigned long int n); |
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#endif |
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#endif /* _PLURAL_EXP_H */ |
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