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glibc/intl/plural-exp.c
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/* Expression parsing for plural form selection. | |
Copyright (C) 2000-2016 Free Software Foundation, Inc. | |
Written by Ulrich Drepper <drepper@cygnus.com>, 2000. | |
This program is free software: you can redistribute it and/or modify | |
it under the terms of the GNU Lesser General Public License as published by | |
the Free Software Foundation; either version 2.1 of the License, or | |
(at your option) any later version. | |
This program is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public License | |
along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
#ifdef HAVE_CONFIG_H | |
# include <config.h> | |
#endif | |
#include <ctype.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include "plural-exp.h" | |
#if (defined __GNUC__ && !(defined __APPLE_CC_ && __APPLE_CC__ > 1) && \ | |
!defined __cplusplus) \ | |
|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) | |
/* These structs are the constant expression for the germanic plural | |
form determination. It represents the expression "n != 1". */ | |
static const struct expression plvar = | |
{ | |
.nargs = 0, | |
.operation = var, | |
}; | |
static const struct expression plone = | |
{ | |
.nargs = 0, | |
.operation = num, | |
.val = | |
{ | |
.num = 1 | |
} | |
}; | |
const struct expression GERMANIC_PLURAL = | |
{ | |
.nargs = 2, | |
.operation = not_equal, | |
.val = | |
{ | |
.args = | |
{ | |
[0] = (struct expression *) &plvar, | |
[1] = (struct expression *) &plone | |
} | |
} | |
}; | |
# define INIT_GERMANIC_PLURAL() | |
#else | |
/* For compilers without support for ISO C 99 struct/union initializers: | |
Initialization at run-time. */ | |
static struct expression plvar; | |
static struct expression plone; | |
struct expression GERMANIC_PLURAL; | |
static void | |
init_germanic_plural (void) | |
{ | |
if (plone.val.num == 0) | |
{ | |
plvar.nargs = 0; | |
plvar.operation = var; | |
plone.nargs = 0; | |
plone.operation = num; | |
plone.val.num = 1; | |
GERMANIC_PLURAL.nargs = 2; | |
GERMANIC_PLURAL.operation = not_equal; | |
GERMANIC_PLURAL.val.args[0] = &plvar; | |
GERMANIC_PLURAL.val.args[1] = &plone; | |
} | |
} | |
# define INIT_GERMANIC_PLURAL() init_germanic_plural () | |
#endif | |
void | |
internal_function | |
EXTRACT_PLURAL_EXPRESSION (const char *nullentry, | |
const struct expression **pluralp, | |
unsigned long int *npluralsp) | |
{ | |
if (nullentry != NULL) | |
{ | |
const char *plural; | |
const char *nplurals; | |
plural = strstr (nullentry, "plural="); | |
nplurals = strstr (nullentry, "nplurals="); | |
if (plural == NULL || nplurals == NULL) | |
goto no_plural; | |
else | |
{ | |
char *endp; | |
unsigned long int n; | |
struct parse_args args; | |
/* First get the number. */ | |
nplurals += 9; | |
while (*nplurals != '\0' && isspace ((unsigned char) *nplurals)) | |
++nplurals; | |
if (!(*nplurals >= '0' && *nplurals <= '9')) | |
goto no_plural; | |
#if defined HAVE_STRTOUL || defined _LIBC | |
n = strtoul (nplurals, &endp, 10); | |
#else | |
for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++) | |
n = n * 10 + (*endp - '0'); | |
#endif | |
if (nplurals == endp) | |
goto no_plural; | |
*npluralsp = n; | |
/* Due to the restrictions bison imposes onto the interface of the | |
scanner function we have to put the input string and the result | |
passed up from the parser into the same structure which address | |
is passed down to the parser. */ | |
plural += 7; | |
args.cp = plural; | |
if (PLURAL_PARSE (&args) != 0) | |
goto no_plural; | |
*pluralp = args.res; | |
} | |
} | |
else | |
{ | |
/* By default we are using the Germanic form: singular form only | |
for `one', the plural form otherwise. Yes, this is also what | |
English is using since English is a Germanic language. */ | |
no_plural: | |
INIT_GERMANIC_PLURAL (); | |
*pluralp = &GERMANIC_PLURAL; | |
*npluralsp = 2; | |
} | |
} |