1 | /* Expression parsing and evaluation for plural form selection. |
2 | Copyright (C) 2000-2016 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 |
6 | it under the terms of the GNU Lesser General Public License as published by |
7 | the Free Software Foundation; either version 2.1 of the License, or |
8 | (at your option) 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 |
13 | GNU Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public License |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _PLURAL_EXP_H |
19 | #define _PLURAL_EXP_H |
20 | |
21 | #ifndef internal_function |
22 | # define internal_function |
23 | #endif |
24 | |
25 | #ifndef attribute_hidden |
26 | # define attribute_hidden |
27 | #endif |
28 | |
29 | #ifdef __cplusplus |
30 | extern "C" { |
31 | #endif |
32 | |
33 | |
34 | enum expression_operator |
35 | { |
36 | /* Without arguments: */ |
37 | var, /* The variable "n". */ |
38 | num, /* Decimal number. */ |
39 | /* Unary operators: */ |
40 | lnot, /* Logical NOT. */ |
41 | /* Binary operators: */ |
42 | mult, /* Multiplication. */ |
43 | divide, /* Division. */ |
44 | module, /* Modulo operation. */ |
45 | plus, /* Addition. */ |
46 | minus, /* Subtraction. */ |
47 | less_than, /* Comparison. */ |
48 | greater_than, /* Comparison. */ |
49 | less_or_equal, /* Comparison. */ |
50 | greater_or_equal, /* Comparison. */ |
51 | equal, /* Comparison for equality. */ |
52 | not_equal, /* Comparison for inequality. */ |
53 | land, /* Logical AND. */ |
54 | lor, /* Logical OR. */ |
55 | /* Ternary operators: */ |
56 | qmop /* Question mark operator. */ |
57 | }; |
58 | |
59 | /* This is the representation of the expressions to determine the |
60 | plural form. */ |
61 | struct expression |
62 | { |
63 | int nargs; /* Number of arguments. */ |
64 | enum expression_operator operation; |
65 | union |
66 | { |
67 | unsigned long int num; /* Number value for `num'. */ |
68 | struct expression *args[3]; /* Up to three arguments. */ |
69 | } val; |
70 | }; |
71 | |
72 | /* This is the data structure to pass information to the parser and get |
73 | the result in a thread-safe way. */ |
74 | struct parse_args |
75 | { |
76 | const char *cp; |
77 | struct expression *res; |
78 | }; |
79 | |
80 | |
81 | /* Names for the libintl functions are a problem. This source code is used |
82 | 1. in the GNU C Library library, |
83 | 2. in the GNU libintl library, |
84 | 3. in the GNU gettext tools. |
85 | The function names in each situation must be different, to allow for |
86 | binary incompatible changes in 'struct expression'. Furthermore, |
87 | 1. in the GNU C Library library, the names have a __ prefix, |
88 | 2.+3. in the GNU libintl library and in the GNU gettext tools, the names |
89 | must follow ANSI C and not start with __. |
90 | So we have to distinguish the three cases. */ |
91 | #ifdef _LIBC |
92 | # define FREE_EXPRESSION __gettext_free_exp |
93 | # define PLURAL_PARSE __gettextparse |
94 | # define GERMANIC_PLURAL __gettext_germanic_plural |
95 | # define |
96 | #elif defined (IN_LIBINTL) |
97 | # define FREE_EXPRESSION libintl_gettext_free_exp |
98 | # define PLURAL_PARSE libintl_gettextparse |
99 | # define GERMANIC_PLURAL libintl_gettext_germanic_plural |
100 | # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural |
101 | #else |
102 | # define FREE_EXPRESSION free_plural_expression |
103 | # define PLURAL_PARSE parse_plural_expression |
104 | # define GERMANIC_PLURAL germanic_plural |
105 | # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression |
106 | #endif |
107 | |
108 | extern void FREE_EXPRESSION (struct expression *exp) |
109 | internal_function; |
110 | extern int PLURAL_PARSE (struct parse_args *arg); |
111 | extern const struct expression GERMANIC_PLURAL attribute_hidden; |
112 | extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry, |
113 | const struct expression **pluralp, |
114 | unsigned long int *npluralsp) |
115 | internal_function; |
116 | |
117 | #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE) |
118 | extern unsigned long int plural_eval (const struct expression *pexp, |
119 | unsigned long int n); |
120 | #endif |
121 | |
122 | |
123 | #ifdef __cplusplus |
124 | } |
125 | #endif |
126 | |
127 | #endif /* _PLURAL_EXP_H */ |
128 | |