1 /* Expression parsing and evaluation for plural form selection.
2    Copyright (C) 2000-2003 Free Software Foundation, Inc.
3    Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
4 
5    This program is free software; you can redistribute it and/or modify it
6    under the terms of the GNU Library General Public License as published
7    by the Free Software Foundation; either version 2, or (at your option)
8    any later version.
9 
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Library General Public License for more details.
14 
15    You should have received a copy of the GNU Library General Public
16    License along with this program; if not, write to the Free Software
17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18    USA.  */
19 
20 #ifndef _PLURAL_EXP_H
21 #define _PLURAL_EXP_H
22 
23 #ifndef internal_function
24 # define internal_function
25 #endif
26 
27 #ifndef attribute_hidden
28 # define attribute_hidden
29 #endif
30 
31 
32 /* This is the representation of the expressions to determine the
33    plural form.  */
34 struct expression
35 {
36   int nargs;			/* Number of arguments.  */
37   enum operator
38   {
39     /* Without arguments:  */
40     var,			/* The variable "n".  */
41     num,			/* Decimal number.  */
42     /* Unary operators:  */
43     lnot,			/* Logical NOT.  */
44     /* Binary operators:  */
45     mult,			/* Multiplication.  */
46     divide,			/* Division.  */
47     module,			/* Modulo operation.  */
48     plus,			/* Addition.  */
49     minus,			/* Subtraction.  */
50     less_than,			/* Comparison.  */
51     greater_than,		/* Comparison.  */
52     less_or_equal,		/* Comparison.  */
53     greater_or_equal,		/* Comparison.  */
54     equal,			/* Comparison for equality.  */
55     not_equal,			/* Comparison for inequality.  */
56     land,			/* Logical AND.  */
57     lor,			/* Logical OR.  */
58     /* Ternary operators:  */
59     qmop			/* Question mark operator.  */
60   } operation;
61   union
62   {
63     unsigned long int num;	/* Number value for `num'.  */
64     struct expression *args[3];	/* Up to three arguments.  */
65   } val;
66 };
67 
68 /* This is the data structure to pass information to the parser and get
69    the result in a thread-safe way.  */
70 struct parse_args
71 {
72   const char *cp;
73   struct expression *res;
74 };
75 
76 
77 /* Names for the libintl functions are a problem.  This source code is used
78    1. in the GNU C Library library,
79    2. in the GNU libintl library,
80    3. in the GNU gettext tools.
81    The function names in each situation must be different, to allow for
82    binary incompatible changes in 'struct expression'.  Furthermore,
83    1. in the GNU C Library library, the names have a __ prefix,
84    2.+3. in the GNU libintl library and in the GNU gettext tools, the names
85          must follow ANSI C and not start with __.
86    So we have to distinguish the three cases.  */
87 #ifdef _LIBC
88 # define FREE_EXPRESSION __gettext_free_exp
89 # define PLURAL_PARSE __gettextparse
90 # define GERMANIC_PLURAL __gettext_germanic_plural
91 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
92 #elif defined (IN_LIBINTL)
93 # define FREE_EXPRESSION libintl_gettext_free_exp
94 # define PLURAL_PARSE libintl_gettextparse
95 # define GERMANIC_PLURAL libintl_gettext_germanic_plural
96 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
97 #else
98 # define FREE_EXPRESSION free_plural_expression
99 # define PLURAL_PARSE parse_plural_expression
100 # define GERMANIC_PLURAL germanic_plural
101 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
102 #endif
103 
104 extern void FREE_EXPRESSION (struct expression *exp)
105      internal_function;
106 extern int PLURAL_PARSE (void *arg);
107 extern struct expression GERMANIC_PLURAL attribute_hidden;
108 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
109 				       struct expression **pluralp,
110 				       unsigned long int *npluralsp)
111      internal_function;
112 
113 #if !defined (_LIBC) && !defined (IN_LIBINTL)
114 extern unsigned long int plural_eval (struct expression *pexp,
115 				      unsigned long int n);
116 #endif
117 
118 #endif /* _PLURAL_EXP_H */
119