| 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". */ |
| 35 | static const struct expression plvar = |
| 36 | { |
| 37 | .nargs = 0, |
| 38 | .operation = var, |
| 39 | }; |
| 40 | static const struct expression plone = |
| 41 | { |
| 42 | .nargs = 0, |
| 43 | .operation = num, |
| 44 | .val = |
| 45 | { |
| 46 | .num = 1 |
| 47 | } |
| 48 | }; |
| 49 | struct 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 | |
| 70 | static struct expression plvar; |
| 71 | static struct expression plone; |
| 72 | struct expression GERMANIC_PLURAL; |
| 73 | |
| 74 | static void |
| 75 | init_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 | |
| 97 | void |
| 98 | internal_function |
| 99 | EXTRACT_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 | } |