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1 /* Expression parsing for plural form selection.
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2 Copyright (C) 2000, 2001 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 #ifdef HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #include <ctype.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include "plural-exp.h"
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29
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30 #if (defined __GNUC__ && !defined __APPLE_CC__) \
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31 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
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32
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33 /* These structs are the constant expression for the germanic plural
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34 form determination. It represents the expression "n != 1". */
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35 static const struct expression plvar =
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36 {
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37 .nargs = 0,
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38 .operation = var,
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39 };
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40 static const struct expression plone =
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41 {
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42 .nargs = 0,
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43 .operation = num,
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44 .val =
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45 {
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46 .num = 1
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47 }
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48 };
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49 struct expression GERMANIC_PLURAL =
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50 {
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51 .nargs = 2,
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52 .operation = not_equal,
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53 .val =
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54 {
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55 .args =
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56 {
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57 [0] = (struct expression *) &plvar,
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58 [1] = (struct expression *) &plone
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59 }
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60 }
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61 };
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62
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63 # define INIT_GERMANIC_PLURAL()
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64
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65 #else
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66
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67 /* For compilers without support for ISO C 99 struct/union initializers:
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68 Initialization at run-time. */
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69
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70 static struct expression plvar;
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71 static struct expression plone;
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72 struct expression GERMANIC_PLURAL;
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73
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74 static void
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75 init_germanic_plural ()
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76 {
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77 if (plone.val.num == 0)
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78 {
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79 plvar.nargs = 0;
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80 plvar.operation = var;
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81
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82 plone.nargs = 0;
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83 plone.operation = num;
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84 plone.val.num = 1;
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85
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86 GERMANIC_PLURAL.nargs = 2;
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87 GERMANIC_PLURAL.operation = not_equal;
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88 GERMANIC_PLURAL.val.args[0] = &plvar;
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89 GERMANIC_PLURAL.val.args[1] = &plone;
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90 }
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91 }
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92
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93 # define INIT_GERMANIC_PLURAL() init_germanic_plural ()
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94
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95 #endif
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96
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97 void
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98 internal_function
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99 EXTRACT_PLURAL_EXPRESSION (nullentry, pluralp, npluralsp)
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100 const char *nullentry;
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101 struct expression **pluralp;
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102 unsigned long int *npluralsp;
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103 {
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104 if (nullentry != NULL)
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105 {
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106 const char *plural;
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107 const char *nplurals;
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108
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109 plural = strstr (nullentry, "plural=");
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110 nplurals = strstr (nullentry, "nplurals=");
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111 if (plural == NULL || nplurals == NULL)
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112 goto no_plural;
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113 else
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114 {
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115 char *endp;
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116 unsigned long int n;
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117 struct parse_args args;
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118
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119 /* First get the number. */
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120 nplurals += 9;
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121 while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
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122 ++nplurals;
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123 if (!(*nplurals >= '0' && *nplurals <= '9'))
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124 goto no_plural;
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125 #if defined HAVE_STRTOUL || defined _LIBC
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126 n = strtoul (nplurals, &endp, 10);
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127 #else
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128 for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
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129 n = n * 10 + (*endp - '0');
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130 #endif
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131 if (nplurals == endp)
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132 goto no_plural;
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133 *npluralsp = n;
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134
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135 /* Due to the restrictions bison imposes onto the interface of the
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136 scanner function we have to put the input string and the result
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137 passed up from the parser into the same structure which address
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138 is passed down to the parser. */
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139 plural += 7;
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140 args.cp = plural;
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141 if (PLURAL_PARSE (&args) != 0)
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142 goto no_plural;
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143 *pluralp = args.res;
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144 }
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145 }
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146 else
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147 {
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148 /* By default we are using the Germanic form: singular form only
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149 for `one', the plural form otherwise. Yes, this is also what
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150 English is using since English is a Germanic language. */
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151 no_plural:
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152 INIT_GERMANIC_PLURAL ();
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153 *pluralp = &GERMANIC_PLURAL;
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154 *npluralsp = 2;
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155 }
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156 }
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