package locale;

our $VERSION = '1.02';
use Config;

$Carp::Internal{ (__PACKAGE__) } = 1;

# A separate bit is used for each of the two forms of the pragma, as they are
# mostly independent, and interact with each other and the unicode_strings
# feature.  This allows for fast determination of which one(s) of the three
# are to be used at any given point, and no code has to be written to deal
# with coming in and out of scopes--it falls automatically out from the hint
# handling

$locale::hint_bits = 0x4;
$locale::not_chars_hint_bits = 0x10;

sub import {
    shift;  # should be 'locale'; not checked

    if(!$Config{d_setlocale}) {
        ## No locale support found on this Perl, giving up:
        die('Your vendor does not support locales, you cannot use the locale module.');
    }

    my $found_not_chars = 0;
    while (defined (my $arg = shift)) {
        if ($arg eq ":not_characters") {
            $^H |= $locale::not_chars_hint_bits;

            # This form of the pragma overrides the other
            $^H &= ~$locale::hint_bits;
            $found_not_chars = 1;
        }
        else {
            require Carp;
            Carp::croak("Unknown parameter '$arg' to 'use locale'");
        }
    }

    # Use the plain form if not doing the :not_characters one.
    $^H |= $locale::hint_bits unless $found_not_chars;
}

sub unimport {
    $^H &= ~($locale::hint_bits|$locale::not_chars_hint_bits);
}

1;