1 /* Expression parsing and evaluation for plural form selection.
2 Copyright (C) 2000-2016, 2019, 2021 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 <https://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 EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
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 #if (defined __GNUC__ && !(defined __APPLE_CC_ && __APPLE_CC__ > 1) \
109 && !defined __cplusplus) \
110 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L \
111 && !defined __HP_cc) \
112 || (defined __SUNPRO_C && 0x560 <= __SUNPRO_C \
113 && !(defined __STDC__ && __STDC__ == 1))
114 # define HAVE_STRUCT_INITIALIZER 1
115 #else
116 # define HAVE_STRUCT_INITIALIZER 0
117 #endif
118
119 extern void FREE_EXPRESSION (struct expression *exp)
120 internal_function;
121 extern int PLURAL_PARSE (struct parse_args *arg);
122 #if HAVE_STRUCT_INITIALIZER
123 extern const struct expression GERMANIC_PLURAL attribute_hidden;
124 #else
125 extern struct expression GERMANIC_PLURAL attribute_hidden;
126 #endif
127 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
128 const struct expression **pluralp,
129 unsigned long int *npluralsp)
130 internal_function;
131
132 #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
133 extern unsigned long int plural_eval (const struct expression *pexp,
134 unsigned long int n);
135 #endif
136
137
138 #ifdef __cplusplus
139 }
140 #endif
141
142 #endif /* _PLURAL_EXP_H */