1/* Expression parsing for plural form selection. 2 Copyright (C) 2000-2001, 2003, 2005-2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 18 USA. */ 19 20#ifdef HAVE_CONFIG_H 21# include <config.h> 22#endif 23 24#include <ctype.h> 25#include <stdlib.h> 26#include <string.h> 27 28#include "plural-exp.h" 29 30#if (defined __GNUC__ && !(__APPLE_CC__ > 1) && !defined __cplusplus) \ 31 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) 32 33/* These structs are the constant expression for the germanic plural 34 form determination. It represents the expression "n != 1". */ 35static const struct expression plvar = 36{ 37 .nargs = 0, 38 .operation = var, 39}; 40static const struct expression plone = 41{ 42 .nargs = 0, 43 .operation = num, 44 .val = 45 { 46 .num = 1 47 } 48}; 49struct expression GERMANIC_PLURAL = 50{ 51 .nargs = 2, 52 .operation = not_equal, 53 .val = 54 { 55 .args = 56 { 57 [0] = (struct expression *) &plvar, 58 [1] = (struct expression *) &plone 59 } 60 } 61}; 62 63# define INIT_GERMANIC_PLURAL() 64 65#else 66 67/* For compilers without support for ISO C 99 struct/union initializers: 68 Initialization at run-time. */ 69 70static struct expression plvar; 71static struct expression plone; 72struct expression GERMANIC_PLURAL; 73 74static void 75init_germanic_plural () 76{ 77 if (plone.val.num == 0) 78 { 79 plvar.nargs = 0; 80 plvar.operation = var; 81 82 plone.nargs = 0; 83 plone.operation = num; 84 plone.val.num = 1; 85 86 GERMANIC_PLURAL.nargs = 2; 87 GERMANIC_PLURAL.operation = not_equal; 88 GERMANIC_PLURAL.val.args[0] = &plvar; 89 GERMANIC_PLURAL.val.args[1] = &plone; 90 } 91} 92 93# define INIT_GERMANIC_PLURAL() init_germanic_plural () 94 95#endif 96 97void 98internal_function 99EXTRACT_PLURAL_EXPRESSION (const char *nullentry, 100 const struct expression **pluralp, 101 unsigned long int *npluralsp) 102{ 103 if (nullentry != NULL) 104 { 105 const char *plural; 106 const char *nplurals; 107 108 plural = strstr (nullentry, "plural="); 109 nplurals = strstr (nullentry, "nplurals="); 110 if (plural == NULL || nplurals == NULL) 111 goto no_plural; 112 else 113 { 114 char *endp; 115 unsigned long int n; 116 struct parse_args args; 117 118 /* First get the number. */ 119 nplurals += 9; 120 while (*nplurals != '\0' && isspace ((unsigned char) *nplurals)) 121 ++nplurals; 122 if (!(*nplurals >= '0' && *nplurals <= '9')) 123 goto no_plural; 124#if defined HAVE_STRTOUL || defined _LIBC 125 n = strtoul (nplurals, &endp, 10); 126#else 127 for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++) 128 n = n * 10 + (*endp - '0'); 129#endif 130 if (nplurals == endp) 131 goto no_plural; 132 *npluralsp = n; 133 134 /* Due to the restrictions bison imposes onto the interface of the 135 scanner function we have to put the input string and the result 136 passed up from the parser into the same structure which address 137 is passed down to the parser. */ 138 plural += 7; 139 args.cp = plural; 140 if (PLURAL_PARSE (&args) != 0) 141 goto no_plural; 142 *pluralp = args.res; 143 } 144 } 145 else 146 { 147 /* By default we are using the Germanic form: singular form only 148 for `one', the plural form otherwise. Yes, this is also what 149 English is using since English is a Germanic language. */ 150 no_plural: 151 INIT_GERMANIC_PLURAL (); 152 *pluralp = &GERMANIC_PLURAL; 153 *npluralsp = 2; 154 } 155} 156