plural-exp.c revision 1.1.1.1.8.2
1/* Expression parsing for plural form selection. 2 Copyright (C) 2000, 2001 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__ && !defined __APPLE_CC__) \ 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 (nullentry, pluralp, npluralsp) 100 const char *nullentry; 101 struct expression **pluralp; 102 unsigned long int *npluralsp; 103{ 104 if (nullentry != NULL) 105 { 106 const char *plural; 107 const char *nplurals; 108 109 plural = strstr (nullentry, "plural="); 110 nplurals = strstr (nullentry, "nplurals="); 111 if (plural == NULL || nplurals == NULL) 112 goto no_plural; 113 else 114 { 115 char *endp; 116 unsigned long int n; 117 struct parse_args args; 118 119 /* First get the number. */ 120 nplurals += 9; 121 while (*nplurals != '\0' && isspace ((unsigned char) *nplurals)) 122 ++nplurals; 123 if (!(*nplurals >= '0' && *nplurals <= '9')) 124 goto no_plural; 125#if defined HAVE_STRTOUL || defined _LIBC 126 n = strtoul (nplurals, &endp, 10); 127#else 128 for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++) 129 n = n * 10 + (*endp - '0'); 130#endif 131 if (nplurals == endp) 132 goto no_plural; 133 *npluralsp = n; 134 135 /* Due to the restrictions bison imposes onto the interface of the 136 scanner function we have to put the input string and the result 137 passed up from the parser into the same structure which address 138 is passed down to the parser. */ 139 plural += 7; 140 args.cp = plural; 141 if (PLURAL_PARSE (&args) != 0) 142 goto no_plural; 143 *pluralp = args.res; 144 } 145 } 146 else 147 { 148 /* By default we are using the Germanic form: singular form only 149 for `one', the plural form otherwise. Yes, this is also what 150 English is using since English is a Germanic language. */ 151 no_plural: 152 INIT_GERMANIC_PLURAL (); 153 *pluralp = &GERMANIC_PLURAL; 154 *npluralsp = 2; 155 } 156} 157