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1 /* Expression parsing and evaluation for plural form selection.
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2 Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
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3 Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
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4
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5 This program is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU Library General Public License as published
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7 by the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this program; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
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18 USA. */
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19
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20 #ifndef _PLURAL_EXP_H
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21 #define _PLURAL_EXP_H
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22
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23 #ifndef PARAMS
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24 # if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
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25 # define PARAMS(args) args
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26 # else
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27 # define PARAMS(args) ()
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28 # endif
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29 #endif
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30
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31 #ifndef internal_function
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32 # define internal_function
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33 #endif
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34
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35 #ifndef attribute_hidden
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36 # define attribute_hidden
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37 #endif
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38
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39
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40 /* This is the representation of the expressions to determine the
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41 plural form. */
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42 struct expression
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43 {
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44 int nargs; /* Number of arguments. */
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45 enum operator
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46 {
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47 /* Without arguments: */
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48 var, /* The variable "n". */
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49 num, /* Decimal number. */
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50 /* Unary operators: */
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51 lnot, /* Logical NOT. */
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52 /* Binary operators: */
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53 mult, /* Multiplication. */
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54 divide, /* Division. */
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55 module, /* Modulo operation. */
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56 plus, /* Addition. */
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57 minus, /* Subtraction. */
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58 less_than, /* Comparison. */
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59 greater_than, /* Comparison. */
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60 less_or_equal, /* Comparison. */
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61 greater_or_equal, /* Comparison. */
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62 equal, /* Comparison for equality. */
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63 not_equal, /* Comparison for inequality. */
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64 land, /* Logical AND. */
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65 lor, /* Logical OR. */
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66 /* Ternary operators: */
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67 qmop /* Question mark operator. */
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68 } operation;
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69 union
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70 {
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71 unsigned long int num; /* Number value for `num'. */
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72 struct expression *args[3]; /* Up to three arguments. */
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73 } val;
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74 };
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75
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76 /* This is the data structure to pass information to the parser and get
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77 the result in a thread-safe way. */
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78 struct parse_args
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79 {
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80 const char *cp;
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81 struct expression *res;
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82 };
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83
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84
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85 /* Names for the libintl functions are a problem. This source code is used
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86 1. in the GNU C Library library,
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87 2. in the GNU libintl library,
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88 3. in the GNU gettext tools.
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89 The function names in each situation must be different, to allow for
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90 binary incompatible changes in 'struct expression'. Furthermore,
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91 1. in the GNU C Library library, the names have a __ prefix,
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92 2.+3. in the GNU libintl library and in the GNU gettext tools, the names
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93 must follow ANSI C and not start with __.
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94 So we have to distinguish the three cases. */
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95 #ifdef _LIBC
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96 # define FREE_EXPRESSION __gettext_free_exp
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97 # define PLURAL_PARSE __gettextparse
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98 # define GERMANIC_PLURAL __gettext_germanic_plural
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99 # define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
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100 #elif defined (IN_LIBINTL)
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101 # define FREE_EXPRESSION libintl_gettext_free_exp
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102 # define PLURAL_PARSE libintl_gettextparse
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103 # define GERMANIC_PLURAL libintl_gettext_germanic_plural
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104 # define EXTRACT_PLURAL_EXPRESSION libintl_gettext_extract_plural
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105 #else
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106 # define FREE_EXPRESSION free_plural_expression
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107 # define PLURAL_PARSE parse_plural_expression
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108 # define GERMANIC_PLURAL germanic_plural
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109 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
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110 #endif
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111
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112 extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
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113 internal_function;
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114 extern int PLURAL_PARSE PARAMS ((void *arg));
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115 extern struct expression GERMANIC_PLURAL attribute_hidden;
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116 extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
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117 struct expression **pluralp,
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118 unsigned long int *npluralsp))
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119 internal_function;
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120
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121 #if !defined (_LIBC) && !defined (IN_LIBINTL)
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122 extern unsigned long int plural_eval PARAMS ((struct expression *pexp,
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123 unsigned long int n));
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124 #endif
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125
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126 #endif /* _PLURAL_EXP_H */
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