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package locale;
our $VERSION = '1.09';
use Config;
$Carp::Internal{ (__PACKAGE__) } = 1;
=head1 NAME
locale - Perl pragma to use or avoid POSIX locales for built-in operations
=head1 WARNING
DO NOT USE this pragma in scripts that have multiple
L<threads|threads> active. The locale is not local to a single thread.
Another thread may change the locale at any time, which could cause at a
minimum that a given thread is operating in a locale it isn't expecting
to be in. On some platforms, segfaults can also occur. The locale
change need not be explicit; some operations cause perl to change the
locale itself. You are vulnerable simply by having done a C<"use
locale">.
=head1 SYNOPSIS
@x = sort @y; # Native-platform/Unicode code point sort order
{
use locale;
@x = sort @y; # Locale-defined sort order
}
@x = sort @y; # Native-platform/Unicode code point sort order
# again
=head1 DESCRIPTION
This pragma tells the compiler to enable (or disable) the use of POSIX
locales for built-in operations (for example, LC_CTYPE for regular
expressions, LC_COLLATE for string comparison, and LC_NUMERIC for number
formatting). Each "use locale" or "no locale"
affects statements to the end of the enclosing BLOCK.
See L<perllocale> for more detailed information on how Perl supports
locales.
On systems that don't have locales, this pragma will cause your operations
to behave as if in the "C" locale; attempts to change the locale will fail.
=cut
# A separate bit is used for each of the two forms of the pragma, to save
# having to look at %^H for the normal case of a plain 'use locale' without an
# argument.
$locale::hint_bits = 0x4;
$locale::partial_hint_bits = 0x10; # If pragma has an argument
# The pseudo-category :characters consists of 2 real ones; but it also is
# given its own number, -1, because in the complement form it also has the
# side effect of "use feature 'unicode_strings'"
sub import {
shift; # should be 'locale'; not checked
$^H{locale} = 0 unless defined $^H{locale};
if (! @_) { # If no parameter, use the plain form that changes all categories
$^H |= $locale::hint_bits;
}
else {
my @categories = ( qw(:ctype :collate :messages
:numeric :monetary :time) );
for (my $i = 0; $i < @_; $i++) {
my $arg = $_[$i];
$complement = $arg =~ s/ : ( ! | not_ ) /:/x;
if (! grep { $arg eq $_ } @categories, ":characters") {
require Carp;
Carp::croak("Unknown parameter '$_[$i]' to 'use locale'");
}
if ($complement) {
if ($i != 0 || $i < @_ - 1) {
require Carp;
Carp::croak("Only one argument to 'use locale' allowed"
. "if is $complement");
}
if ($arg eq ':characters') {
push @_, grep { $_ ne ':ctype' && $_ ne ':collate' }
@categories;
# We add 1 to the category number; This category number
# is -1
$^H{locale} |= (1 << 0);
}
else {
push @_, grep { $_ ne $arg } @categories;
}
next;
}
elsif ($arg eq ':characters') {
push @_, ':ctype', ':collate';
next;
}
$^H |= $locale::partial_hint_bits;
# This form of the pragma overrides the other
$^H &= ~$locale::hint_bits;
$arg =~ s/^://;
eval { require POSIX; import POSIX 'locale_h'; };
# Map our names to the ones defined by POSIX
my $LC = "LC_" . uc($arg);
my $bit = eval "&POSIX::$LC";
if (defined $bit) { # XXX Should we warn that this category isn't
# supported on this platform, or make it
# always be the C locale?
# Verify our assumption.
if (! ($bit >= 0 && $bit < 31)) {
require Carp;
Carp::croak("Cannot have ':$arg' parameter to 'use locale'"
. " on this platform. Use the 'perlbug' utility"
. " to report this problem, or send email to"
. " 'perlbug\@perl.org'. $LC=$bit");
}
# 1 is added so that the pseudo-category :characters, which is
# -1, comes out 0.
$^H{locale} |= 1 << ($bit + 1);
}
}
}
}
sub unimport {
$^H &= ~($locale::hint_bits|$locale::partial_hint_bits);
$^H{locale} = 0;
}
1;
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