Gecko [ theprintave.ca ]

Name	Size	Permission	Date
App	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Archive	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Attribute	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
B	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
CPAN	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Carp	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Class	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Compress	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Config	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
DBM_Filter	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Devel	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Digest	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Encode	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Exporter	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
ExtUtils	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
File	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Filter	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Getopt	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
HTTP	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
I18N	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
IO	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
IPC	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
JSON	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Locale	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Math	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Memoize	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Module	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Net	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Params	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Parse	[ DIR ]	drwxr-xr-x	2024-02-16 18:44
Perl	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
PerlIO	[ DIR ]	drwxr-xr-x	2024-02-16 18:44
Pod	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Search	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
TAP	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Term	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Test	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Test2	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Text	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Thread	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Tie	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Time	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
Unicode	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
User	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
autodie	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
encoding	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
overload	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
pod	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
unicore	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
version	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
warnings	[ DIR ]	drwxr-xr-x	2025-04-15 06:10
AnyDBM_File.pm	2.56 KB	-rw-r--r--	2025-04-08 13:21
AutoLoader.pm	15.43 KB	-rw-r--r--	2025-04-08 13:21
AutoSplit.pm	19.18 KB	-rw-r--r--	2025-04-08 13:21
Benchmark.pm	30.3 KB	-rw-r--r--	2025-04-08 13:21
CORE.pod	3.11 KB	-rw-r--r--	2025-04-08 13:21
CPAN.pm	143.09 KB	-rw-r--r--	2025-04-08 13:21
Carp.pm	35.14 KB	-rw-r--r--	2025-04-08 13:21
DB.pm	18.48 KB	-rw-r--r--	2025-04-08 13:21
DBM_Filter.pm	14.05 KB	-rw-r--r--	2025-04-08 13:21
Digest.pm	10.96 KB	-rw-r--r--	2025-04-08 13:21
DirHandle.pm	2.04 KB	-rw-r--r--	2025-04-08 13:21
Dumpvalue.pm	17.25 KB	-rw-r--r--	2025-04-08 13:21
English.pm	4.65 KB	-rw-r--r--	2025-04-08 13:21
Env.pm	5.44 KB	-rw-r--r--	2025-04-08 13:21
Exporter.pm	18.33 KB	-rw-r--r--	2025-04-08 13:21
Fatal.pm	57.7 KB	-rw-r--r--	2025-04-08 13:21
FileCache.pm	5.42 KB	-rw-r--r--	2025-04-08 13:21
FileHandle.pm	6.63 KB	-rw-r--r--	2025-04-08 13:21
FindBin.pm	4.54 KB	-rw-r--r--	2025-04-08 13:21
Internals.pod	2.51 KB	-rw-r--r--	2025-04-08 13:21
Memoize.pm	35.34 KB	-rw-r--r--	2025-04-08 13:21
NEXT.pm	18.54 KB	-rw-r--r--	2025-04-08 13:21
PerlIO.pm	14.1 KB	-rw-r--r--	2025-04-08 13:21
Safe.pm	24.76 KB	-rw-r--r--	2025-04-08 13:21
SelectSaver.pm	1.05 KB	-rw-r--r--	2025-04-08 13:21
SelfLoader.pm	17.27 KB	-rw-r--r--	2025-04-08 13:21
Symbol.pm	4.79 KB	-rw-r--r--	2025-04-08 13:21
Test.pm	29.34 KB	-rw-r--r--	2025-04-08 13:21
Test2.pm	6.24 KB	-rw-r--r--	2025-04-08 13:21
Thread.pm	8.09 KB	-rw-r--r--	2025-04-08 13:21
UNIVERSAL.pm	6.44 KB	-rw-r--r--	2025-04-08 13:21
XSLoader.pm	10.99 KB	-rw-r--r--	2025-04-08 13:21
_charnames.pm	33.35 KB	-rw-r--r--	2025-04-08 13:21
autodie.pm	12.14 KB	-rw-r--r--	2025-04-08 13:21
autouse.pm	4.14 KB	-rw-r--r--	2025-04-08 13:21
base.pm	10.7 KB	-rw-r--r--	2025-04-08 13:21
bigint.pm	22.85 KB	-rw-r--r--	2025-04-08 13:21
bignum.pm	20.64 KB	-rw-r--r--	2025-04-08 13:21
bigrat.pm	15.78 KB	-rw-r--r--	2025-04-08 13:21
blib.pm	2.01 KB	-rw-r--r--	2025-04-08 13:21
bytes.pm	3.69 KB	-rw-r--r--	2025-04-08 13:21
bytes_heavy.pl	758 B	-rw-r--r--	2025-04-08 13:21
charnames.pm	20.44 KB	-rw-r--r--	2025-04-08 13:21
constant.pm	14.38 KB	-rw-r--r--	2025-04-08 13:21
deprecate.pm	4.92 KB	-rw-r--r--	2025-04-08 13:21
diagnostics.pm	18.85 KB	-rw-r--r--	2025-04-08 13:21
dumpvar.pl	15.19 KB	-rw-r--r--	2025-04-08 13:21
experimental.pm	7.42 KB	-rw-r--r--	2025-04-08 13:21
feature.pm	22.11 KB	-rw-r--r--	2025-04-08 13:21
fields.pm	9.25 KB	-rw-r--r--	2025-04-08 13:21
filetest.pm	3.91 KB	-rw-r--r--	2025-04-08 13:21
if.pm	3.54 KB	-rw-r--r--	2025-04-08 13:21
integer.pm	3.18 KB	-rw-r--r--	2025-04-08 13:21
less.pm	3.13 KB	-rw-r--r--	2025-04-08 13:21
locale.pm	4.77 KB	-rw-r--r--	2025-04-08 13:21
meta_notation.pm	2.07 KB	-rw-r--r--	2025-04-08 13:21
ok.pm	967 B	-rw-r--r--	2025-04-08 13:21
open.pm	8.31 KB	-rw-r--r--	2025-04-08 13:21
overload.pm	52.1 KB	-rw-r--r--	2025-04-08 13:21
overloading.pm	1.77 KB	-rw-r--r--	2025-04-08 13:21
parent.pm	2.64 KB	-rw-r--r--	2025-04-08 13:21
perl5db.pl	309.86 KB	-rw-r--r--	2025-04-08 13:21
perlfaq.pm	77 B	-rw-r--r--	2025-04-08 13:21
sigtrap.pm	8.53 KB	-rw-r--r--	2025-04-08 13:21
sort.pm	3.82 KB	-rw-r--r--	2025-04-08 13:21
strict.pm	4.67 KB	-rw-r--r--	2025-04-08 13:21
subs.pm	945 B	-rw-r--r--	2025-04-08 13:21
utf8.pm	10.5 KB	-rw-r--r--	2025-04-08 13:21
vars.pm	2.4 KB	-rw-r--r--	2025-04-08 13:21
version.pm	1.93 KB	-rw-r--r--	2025-04-08 13:21
version.pod	9.6 KB	-rw-r--r--	2025-04-08 13:21
vmsish.pm	4.21 KB	-rw-r--r--	2025-04-08 13:21
warnings.pm	51.97 KB	-rw-r--r--	2025-04-08 13:21

Rename

package Symbol;

use strict;
use warnings;

=head1 NAME

Symbol - manipulate Perl symbols and their names

=head1 SYNOPSIS

use Symbol;

$sym = gensym;
    open($sym, '<', "filename");
    $_ = <$sym>;
    # etc.

ungensym $sym;      # no effect

# replace *FOO{IO} handle but not $FOO, %FOO, etc.
    *FOO = geniosym;

print qualify("x"), "\n";              # "main::x"
    print qualify("x", "FOO"), "\n";       # "FOO::x"
    print qualify("BAR::x"), "\n";         # "BAR::x"
    print qualify("BAR::x", "FOO"), "\n";  # "BAR::x"
    print qualify("STDOUT", "FOO"), "\n";  # "main::STDOUT" (global)
    print qualify(\*x), "\n";              # returns \*x
    print qualify(\*x, "FOO"), "\n";       # returns \*x

use strict refs;
    print { qualify_to_ref $fh } "foo!\n";
    $ref = qualify_to_ref $name, $pkg;

use Symbol qw(delete_package);
    delete_package('Foo::Bar');
    print "deleted\n" unless exists $Foo::{'Bar::'};

=head1 DESCRIPTION

C<Symbol::gensym> creates an anonymous glob and returns a reference
to it.  Such a glob reference can be used as a file or directory
handle.

For backward compatibility with older implementations that didn't
support anonymous globs, C<Symbol::ungensym> is also provided.
But it doesn't do anything.

C<Symbol::geniosym> creates an anonymous IO handle.  This can be
assigned into an existing glob without affecting the non-IO portions
of the glob.

C<Symbol::qualify> turns unqualified symbol names into qualified
variable names (e.g. "myvar" -E<gt> "MyPackage::myvar").  If it is given a
second parameter, C<qualify> uses it as the default package;
otherwise, it uses the package of its caller.  Regardless, global
variable names (e.g. "STDOUT", "ENV", "SIG") are always qualified with
"main::".

Qualification applies only to symbol names (strings).  References are
left unchanged under the assumption that they are glob references,
which are qualified by their nature.

C<Symbol::qualify_to_ref> is just like C<Symbol::qualify> except that it
returns a glob ref rather than a symbol name, so you can use the result
even if C<use strict 'refs'> is in effect.

C<Symbol::delete_package> wipes out a whole package namespace.  Note
this routine is not exported by default--you may want to import it
explicitly.

=head1 BUGS

C<Symbol::delete_package> is a bit too powerful. It undefines every symbol that
lives in the specified package. Since perl, for performance reasons, does not
perform a symbol table lookup each time a function is called or a global
variable is accessed, some code that has already been loaded and that makes use
of symbols in package C<Foo> may stop working after you delete C<Foo>, even if
you reload the C<Foo> module afterwards.

=cut

require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(gensym ungensym qualify qualify_to_ref);
our @EXPORT_OK = qw(delete_package geniosym);

our $VERSION = '1.09';

my $genpkg = "Symbol::";
my $genseq = 0;

my %global = map {$_ => 1} qw(ARGV ARGVOUT ENV INC SIG STDERR STDIN STDOUT);

#
# Note that we never _copy_ the glob; we just make a ref to it.
# If we did copy it, then SVf_FAKE would be set on the copy, and
# glob-specific behaviors (e.g. C<*$ref = \&func>) wouldn't work.
#
sub gensym () {
    my $name = "GEN" . $genseq++;
    no strict 'refs';
    my $ref = \*{$genpkg . $name};
    delete $$genpkg{$name};
    $ref;
}

sub geniosym () {
    my $sym = gensym();
    # force the IO slot to be filled
    select(select $sym);
    *$sym{IO};
}

sub ungensym ($) {}

sub qualify ($;$) {
    my ($name) = @_;
    if (!ref($name) && index($name, '::') == -1 && index($name, "'") == -1) {
	my $pkg;
	# Global names: special character, "^xyz", or other. 
	if ($name =~ /^(([^a-z])|(\^[a-z_]+))\z/i || $global{$name}) {
	    # RGS 2001-11-05 : translate leading ^X to control-char
	    $name =~ s/^\^([a-z_])/'qq(\c'.$1.')'/eei;
	    $pkg = "main";
	}
	else {
	    $pkg = (@_ > 1) ? $_[1] : caller;
	}
	$name = $pkg . "::" . $name;
    }
    $name;
}

sub qualify_to_ref ($;$) {
    no strict 'refs';
    return \*{ qualify $_[0], @_ > 1 ? $_[1] : caller };
}

#
# of Safe.pm lineage
#
sub delete_package ($) {
    my $pkg = shift;

# expand to full symbol table name if needed

unless ($pkg =~ /^main::.*::$/) {
        $pkg = "main$pkg"	if	$pkg =~ /^::/;
        $pkg = "main::$pkg"	unless	$pkg =~ /^main::/;
        $pkg .= '::'		unless	$pkg =~ /::$/;
    }

my($stem, $leaf) = $pkg =~ m/(.*::)(\w+::)$/;
    no strict 'refs';
    my $stem_symtab = *{$stem}{HASH};
    return unless defined $stem_symtab and exists $stem_symtab->{$leaf};

# free all the symbols in the package

my $leaf_symtab = *{$stem_symtab->{$leaf}}{HASH};
    foreach my $name (keys %$leaf_symtab) {
        undef *{$pkg . $name};
    }
    use strict 'refs';

# delete the symbol table

%$leaf_symtab = ();
    delete $stem_symtab->{$leaf};
}