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Diffstat (limited to 'intl/plural-exp.h')
| -rw-r--r-- | intl/plural-exp.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/intl/plural-exp.h b/intl/plural-exp.h new file mode 100644 index 0000000000..389a5c626e --- /dev/null +++ b/intl/plural-exp.h @@ -0,0 +1,118 @@ +/* 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 */ |