FM / URI

/usr/share/perl5/URI

Name	Size	Mode	Actions
file/	-	0755	rm
urn/	-	0755	rm
data.pm	3417	0644	edit dl rm
Escape.pm	7061	0644	edit dl rm
file.pm	9761	0644	edit dl rm
ftp.pm	1082	0644	edit dl rm
gopher.pm	2454	0644	edit dl rm
Heuristic.pm	6524	0644	edit dl rm
http.pm	451	0644	edit dl rm
https.pm	170	0644	edit dl rm
IRI.pm	820	0644	edit dl rm
ldap.pm	2950	0644	edit dl rm
ldapi.pm	467	0644	edit dl rm
ldaps.pm	170	0644	edit dl rm
mailto.pm	1302	0644	edit dl rm
mms.pm	151	0644	edit dl rm
news.pm	1480	0644	edit dl rm
nntp.pm	153	0644	edit dl rm
pop.pm	1233	0644	edit dl rm
QueryParam.pm	4887	0644	edit dl rm
rlogin.pm	155	0644	edit dl rm
rsync.pm	233	0644	edit dl rm
rtsp.pm	151	0644	edit dl rm
rtspu.pm	152	0644	edit dl rm
sftp.pm	124	0644	edit dl rm
sip.pm	1735	0644	edit dl rm
sips.pm	169	0644	edit dl rm
snews.pm	198	0644	edit dl rm
Split.pm	2379	0644	edit dl rm
ssh.pm	201	0644	edit dl rm
telnet.pm	154	0644	edit dl rm
tn3270.pm	154	0644	edit dl rm
URL.pm	5487	0644	edit dl rm
urn.pm	2201	0644	edit dl rm
WithBase.pm	3857	0644	edit dl rm
_foreign.pm	133	0644	edit dl rm
_generic.pm	5848	0644	edit dl rm
_idna.pm	2105	0644	edit dl rm
_ldap.pm	3275	0644	edit dl rm
_login.pm	257	0644	edit dl rm
_punycode.pm	5648	0644	edit dl rm
_query.pm	2557	0644	edit dl rm
_segment.pm	442	0644	edit dl rm
_server.pm	3750	0644	edit dl rm
_userpass.pm	1060	0644	edit dl rm

Edit: /usr/share/perl5/URI/_punycode.pm (5648B)

package URI::_punycode;

use strict;
use warnings;

our $VERSION = '1.73';
$VERSION = eval $VERSION;

use Exporter 'import';
our @EXPORT = qw(encode_punycode decode_punycode);

use integer;

our $DEBUG = 0;

use constant BASE => 36;
use constant TMIN => 1;
use constant TMAX => 26;
use constant SKEW => 38;
use constant DAMP => 700;
use constant INITIAL_BIAS => 72;
use constant INITIAL_N => 128;

my $Delimiter = chr 0x2D;
my $BasicRE   = qr/[\x00-\x7f]/;

sub _croak { require Carp; Carp::croak(@_); }

sub digit_value {
    my $code = shift;
    return ord($code) - ord("A") if $code =~ /[A-Z]/;
    return ord($code) - ord("a") if $code =~ /[a-z]/;
    return ord($code) - ord("0") + 26 if $code =~ /[0-9]/;
    return;
}

sub code_point {
    my $digit = shift;
    return $digit + ord('a') if 0 <= $digit && $digit <= 25;
    return $digit + ord('0') - 26 if 26 <= $digit && $digit <= 36;
    die 'NOT COME HERE';
}

sub adapt {
    my($delta, $numpoints, $firsttime) = @_;
    $delta = $firsttime ? $delta / DAMP : $delta / 2;
    $delta += $delta / $numpoints;
    my $k = 0;
    while ($delta > ((BASE - TMIN) * TMAX) / 2) {
	$delta /= BASE - TMIN;
	$k += BASE;
    }
    return $k + (((BASE - TMIN + 1) * $delta) / ($delta + SKEW));
}

sub decode_punycode {
    my $code = shift;

my $n      = INITIAL_N;
    my $i      = 0;
    my $bias   = INITIAL_BIAS;
    my @output;

if ($code =~ s/(.*)$Delimiter//o) {
	push @output, map ord, split //, $1;
	return _croak('non-basic code point') unless $1 =~ /^$BasicRE*$/o;
    }

while ($code) {
	my $oldi = $i;
	my $w    = 1;
    LOOP:
	for (my $k = BASE; 1; $k += BASE) {
	    my $cp = substr($code, 0, 1, '');
	    my $digit = digit_value($cp);
	    defined $digit or return _croak("invalid punycode input");
	    $i += $digit * $w;
	    my $t = ($k <= $bias) ? TMIN
		: ($k >= $bias + TMAX) ? TMAX : $k - $bias;
	    last LOOP if $digit < $t;
	    $w *= (BASE - $t);
	}
	$bias = adapt($i - $oldi, @output + 1, $oldi == 0);
	warn "bias becomes $bias" if $DEBUG;
	$n += $i / (@output + 1);
	$i = $i % (@output + 1);
	splice(@output, $i, 0, $n);
	warn join " ", map sprintf('%04x', $_), @output if $DEBUG;
	$i++;
    }
    return join '', map chr, @output;
}

sub encode_punycode {
    my $input = shift;
    my @input = split //, $input;

my $n     = INITIAL_N;
    my $delta = 0;
    my $bias  = INITIAL_BIAS;

my @output;
    my @basic = grep /$BasicRE/, @input;
    my $h = my $b = @basic;
    push @output, @basic;
    push @output, $Delimiter if $b && $h < @input;
    warn "basic codepoints: (@output)" if $DEBUG;

while ($h < @input) {
	my $m = min(grep { $_ >= $n } map ord, @input);
	warn sprintf "next code point to insert is %04x", $m if $DEBUG;
	$delta += ($m - $n) * ($h + 1);
	$n = $m;
	for my $i (@input) {
	    my $c = ord($i);
	    $delta++ if $c < $n;
	    if ($c == $n) {
		my $q = $delta;
	    LOOP:
		for (my $k = BASE; 1; $k += BASE) {
		    my $t = ($k <= $bias) ? TMIN :
			($k >= $bias + TMAX) ? TMAX : $k - $bias;
		    last LOOP if $q < $t;
		    my $cp = code_point($t + (($q - $t) % (BASE - $t)));
		    push @output, chr($cp);
		    $q = ($q - $t) / (BASE - $t);
		}
		push @output, chr(code_point($q));
		$bias = adapt($delta, $h + 1, $h == $b);
		warn "bias becomes $bias" if $DEBUG;
		$delta = 0;
		$h++;
	    }
	}
	$delta++;
	$n++;
    }
    return join '', @output;
}

sub min {
    my $min = shift;
    for (@_) { $min = $_ if $_ <= $min }
    return $min;
}

1;
__END__

=encoding utf8

=head1 NAME

URI::_punycode - encodes Unicode string in Punycode

=head1 SYNOPSIS

use strict;
  use warnings;
  use utf8;

use URI::_punycode qw(encode_punycode decode_punycode);

# encode a unicode string
  my $punycode = encode_punycode('http://☃.net'); # http://.net-xc8g
  $punycode = encode_punycode('bücher'); # bcher-kva
  $punycode = encode_punycode('他们为什么不说中文'); # ihqwcrb4cv8a8dqg056pqjye

# decode a punycode string back into a unicode string
  my $unicode = decode_punycode('http://.net-xc8g'); # http://☃.net
  $unicode = decode_punycode('bcher-kva'); # bücher
  $unicode = decode_punycode('ihqwcrb4cv8a8dqg056pqjye'); # 他们为什么不说中文

=head1 DESCRIPTION

L<URI::_punycode> is a module to encode / decode Unicode strings into
L<Punycode|https://tools.ietf.org/html/rfc3492>, an efficient
encoding of Unicode for use with L<IDNA|https://tools.ietf.org/html/rfc5890>.

=head1 FUNCTIONS

All functions throw exceptions on failure. You can C<catch> them with
L<Syntax::Keyword::Try> or L<Try::Tiny>. The following functions are exported
by default.

=head2 encode_punycode

my $punycode = encode_punycode('http://☃.net');  # http://.net-xc8g
  $punycode = encode_punycode('bücher'); # bcher-kva
  $punycode = encode_punycode('他们为什么不说中文') # ihqwcrb4cv8a8dqg056pqjye

Takes a Unicode string (UTF8-flagged variable) and returns a Punycode
encoding for it.

=head2 decode_punycode

my $unicode = decode_punycode('http://.net-xc8g'); # http://☃.net
  $unicode = decode_punycode('bcher-kva'); # bücher
  $unicode = decode_punycode('ihqwcrb4cv8a8dqg056pqjye'); # 他们为什么不说中文

Takes a Punycode encoding and returns original Unicode string.

=head1 AUTHOR

Tatsuhiko Miyagawa <F<miyagawa@bulknews.net>> is the author of
L<IDNA::Punycode> which was the basis for this module.

=head1 SEE ALSO

L<IDNA::Punycode>, L<RFC 3492|https://tools.ietf.org/html/rfc3492>,
L<RFC 5891|https://tools.ietf.org/html/rfc5891>

=head1 COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

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