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Diffstat (limited to 'intl/plural-exp.c')
| -rw-r--r-- | intl/plural-exp.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/intl/plural-exp.c b/intl/plural-exp.c new file mode 100644 index 0000000000..ba5d455cd5 --- /dev/null +++ b/intl/plural-exp.c @@ -0,0 +1,157 @@ +/* Expression parsing for plural form selection. + Copyright (C) 2000, 2001 Free Software Foundation, Inc. + Written by Ulrich Drepper <drepper@cygnus.com>, 2000. + This file is part of the GNU C Library. + + The GNU C Library 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. + + The GNU C Library 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 the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#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__) \ + || (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 + } +}; +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 () +{ + 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 (nullentry, pluralp, npluralsp) + const char *nullentry; + 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; + } +} |