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Name	Size	Permission	Date
Algorithm	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
App	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Archive	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Array	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Attribute	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
B	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
CORE	[ DIR ]	drwxrwxrwx	2024-07-26 17:42
CPAN	[ DIR ]	drwxrwxrwx	2024-07-26 17:42
Capture	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Carp	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Class	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Compress	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Config	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
DBM_Filter	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Data	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Devel	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Digest	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Encode	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Exporter	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
ExtUtils	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
File	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Filter	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Getopt	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
HTML	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
HTTP	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Hash	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
I18N	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
IO	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
IPC	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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List	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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MRO	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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Memoize	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Module	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Net	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Params	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Parse	[ DIR ]	drwxrwxrwx	2024-07-26 17:38
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PerlIO	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Pod	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Regexp	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Scalar	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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Software	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Sub	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Sys	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
TAP	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Term	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Test	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Test2	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Text	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
Thread	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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autodie	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
encoding	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
overload	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
pods	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
threads	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
unicore	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
version	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
warnings	[ DIR ]	drwxrwxrwx	2024-07-26 17:40
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AutoLoader.pm	15.43 KB	-rw-rw-rw-	2020-12-18 11:57
AutoSplit.pm	19.18 KB	-rw-rw-rw-	2020-12-18 11:57
B.pm	28.78 KB	-rw-rw-rw-	2020-12-18 12:04
Benchmark.pm	30.3 KB	-rw-rw-rw-	2020-12-18 11:58
CORE.pod	3.11 KB	-rw-rw-rw-	2020-12-18 11:58
CPAN.pm	142.98 KB	-rw-rw-rw-	2020-06-13 08:47
Carp.pm	35.12 KB	-rw-rw-rw-	2020-12-18 12:04
Config.pm	3.29 KB	-rw-rw-rw-	2024-07-26 17:42
Config.pod	258.26 KB	-rw-rw-rw-	2021-01-24 16:01
Config_git.pl	421 B	-rw-rw-rw-	2021-01-24 16:01
Config_heavy.pl	37.27 KB	-rw-rw-rw-	2023-11-19 11:41
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DB.pm	18.48 KB	-rw-rw-rw-	2020-12-18 11:58
DBM_Filter.pm	14.05 KB	-rw-rw-rw-	2020-12-18 11:58
Digest.pm	10.96 KB	-rw-rw-rw-	2020-10-13 23:59
DirHandle.pm	2.04 KB	-rw-rw-rw-	2020-12-18 11:58
Dumpvalue.pm	17.25 KB	-rw-rw-rw-	2020-12-18 11:58
DynaLoader.pm	25.4 KB	-rw-rw-rw-	2021-01-24 16:01
Encode.pm	31.33 KB	-rw-rw-rw-	2020-12-02 03:28
English.pm	4.65 KB	-rw-rw-rw-	2020-12-18 11:58
Env.pm	5.39 KB	-rw-rw-rw-	2020-12-18 12:04
Errno.pm	92.68 KB	-rw-rw-rw-	2021-01-24 16:07
Exporter.pm	18.36 KB	-rw-rw-rw-	2020-12-18 12:04
Fatal.pm	57.7 KB	-rw-rw-rw-	2021-01-22 19:03
Fcntl.pm	3.95 KB	-rw-rw-rw-	2020-12-18 12:04
FileCache.pm	5.42 KB	-rw-rw-rw-	2020-12-18 11:58
FileHandle.pm	6.63 KB	-rw-rw-rw-	2020-12-18 11:58
FindBin.pm	4.54 KB	-rw-rw-rw-	2020-12-11 21:08
GDBM_File.pm	2.03 KB	-rw-rw-rw-	2020-12-18 11:58
IO.pm	1.42 KB	-rw-rw-rw-	2021-01-05 00:24
Internals.pod	2.51 KB	-rw-rw-rw-	2020-12-18 11:58
Memoize.pm	35.34 KB	-rw-rw-rw-	2020-12-18 11:58
NDBM_File.pm	3.01 KB	-rw-rw-rw-	2020-12-18 11:58
NEXT.pm	18.54 KB	-rw-rw-rw-	2020-12-18 11:58
O.pm	4.19 KB	-rw-rw-rw-	2020-12-18 11:58
ODBM_File.pm	2.9 KB	-rw-rw-rw-	2020-12-18 12:04
Opcode.pm	15.85 KB	-rw-rw-rw-	2021-01-09 14:15
POSIX.pm	19.87 KB	-rw-rw-rw-	2020-12-18 12:04
POSIX.pod	78.81 KB	-rw-rw-rw-	2020-12-18 12:04
PerlIO.pm	14.1 KB	-rw-rw-rw-	2020-12-18 11:58
SDBM_File.pm	3.72 KB	-rw-rw-rw-	2020-12-18 11:58
Safe.pm	24.77 KB	-rw-rw-rw-	2021-01-09 14:15
SelectSaver.pm	1.05 KB	-rw-rw-rw-	2020-12-18 11:58
SelfLoader.pm	17.27 KB	-rw-rw-rw-	2020-12-18 11:58
Socket.pm	36.16 KB	-rw-rw-rw-	2021-01-05 17:48
Storable.pm	48.75 KB	-rw-rw-rw-	2020-12-18 12:04
Symbol.pm	4.69 KB	-rw-rw-rw-	2020-12-18 12:04
Test.pm	29.34 KB	-rw-rw-rw-	2020-12-18 11:58
Test2.pm	6.24 KB	-rw-rw-rw-	2020-10-22 07:10
Thread.pm	8.09 KB	-rw-rw-rw-	2020-12-18 11:58
UNIVERSAL.pm	6.44 KB	-rw-rw-rw-	2020-12-18 11:58
URI.pm	33.95 KB	-rw-rw-rw-	2021-01-14 18:01
Win32.pm	57.28 KB	-rw-rw-rw-	2020-03-28 07:37
Win32CORE.pm	1.27 KB	-rw-rw-rw-	2020-12-18 11:58
XSLoader.pm	11.37 KB	-rw-rw-rw-	2021-01-24 16:07
_charnames.pm	33.35 KB	-rw-rw-rw-	2020-12-18 11:58
attributes.pm	15.97 KB	-rw-rw-rw-	2020-12-18 11:58
autodie.pm	12.14 KB	-rw-rw-rw-	2021-01-22 19:03
autouse.pm	4.14 KB	-rw-rw-rw-	2020-12-18 11:58
base.pm	10.7 KB	-rw-rw-rw-	2020-12-18 11:58
bigint.pm	22.85 KB	-rw-rw-rw-	2020-12-18 11:58
bignum.pm	20.64 KB	-rw-rw-rw-	2020-12-18 11:58
bigrat.pm	15.78 KB	-rw-rw-rw-	2020-12-18 11:58
blib.pm	2.01 KB	-rw-rw-rw-	2020-12-18 11:58
bytes.pm	3.65 KB	-rw-rw-rw-	2020-12-18 12:04
bytes_heavy.pl	758 B	-rw-rw-rw-	2020-12-18 11:58
charnames.pm	20.44 KB	-rw-rw-rw-	2020-12-18 11:58
constant.pm	14.38 KB	-rw-rw-rw-	2020-12-18 11:58
cpanfile-faq.pod	4.39 KB	-rw-rw-rw-	2018-04-26 13:07
cpanfile.pod	3.39 KB	-rw-rw-rw-	2018-04-26 13:07
deprecate.pm	4.5 KB	-rw-rw-rw-	2020-12-18 11:58
diagnostics.pm	18.85 KB	-rw-rw-rw-	2020-12-18 11:58
dumpvar.pl	15.19 KB	-rw-rw-rw-	2020-12-18 11:58
encoding.pm	22.41 KB	-rw-rw-rw-	2020-12-18 11:57
experimental.pm	7.39 KB	-rw-rw-rw-	2020-05-05 00:34
feature.pm	18.56 KB	-rw-rw-rw-	2020-12-18 12:04
fields.pm	9.25 KB	-rw-rw-rw-	2020-12-18 11:58
filetest.pm	3.91 KB	-rw-rw-rw-	2020-12-18 11:58
if.pm	3.53 KB	-rw-rw-rw-	2020-12-18 12:04
integer.pm	3.18 KB	-rw-rw-rw-	2020-12-18 11:58
less.pm	3.13 KB	-rw-rw-rw-	2020-12-18 11:58
lib.pm	6.2 KB	-rw-rw-rw-	2021-01-24 16:01
locale.pm	4.74 KB	-rw-rw-rw-	2020-12-18 12:04
meta_notation.pm	2.07 KB	-rw-rw-rw-	2020-12-18 11:58
mro.pm	9.66 KB	-rw-rw-rw-	2020-12-18 12:04
newgetopt.pl	2.15 KB	-rw-rw-rw-	2010-07-09 16:26
ok.pm	967 B	-rw-rw-rw-	2020-10-22 07:10
open.pm	8.31 KB	-rw-rw-rw-	2020-12-18 11:58
ops.pm	997 B	-rw-rw-rw-	2020-12-18 11:58
overload.pm	52.05 KB	-rw-rw-rw-	2020-12-18 12:04
overloading.pm	1.77 KB	-rw-rw-rw-	2020-12-18 11:58
parent.pm	2.64 KB	-rw-rw-rw-	2020-12-18 11:58
perl5db.pl	309.69 KB	-rw-rw-rw-	2020-12-18 12:04
perlfaq.pm	77 B	-rw-rw-rw-	2020-11-07 23:02
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perlglossary.pod	134.02 KB	-rw-rw-rw-	2020-11-07 23:02
perllocal.pod	115.37 KB	-rw-rw-rw-	2021-01-24 18:08
re.pm	24.8 KB	-rw-rw-rw-	2020-12-18 12:04
sigtrap.pm	8.53 KB	-rw-rw-rw-	2020-12-18 11:58
sort.pm	3.82 KB	-rw-rw-rw-	2020-12-18 11:58
strict.pm	4.63 KB	-rw-rw-rw-	2020-12-18 12:04
subs.pm	901 B	-rw-rw-rw-	2020-12-18 12:04
threads.pm	37.06 KB	-rw-rw-rw-	2020-12-18 12:04
utf8.pm	10.18 KB	-rw-rw-rw-	2020-12-18 12:04
vars.pm	2.4 KB	-rw-rw-rw-	2020-12-18 11:58
version.pm	3.47 KB	-rw-rw-rw-	2020-09-22 22:16
version.pod	9.6 KB	-rw-rw-rw-	2020-07-31 20:44
vmsish.pm	4.21 KB	-rw-rw-rw-	2020-12-18 11:58
warnings.pm	49.35 KB	-rw-rw-rw-	2020-12-18 12:04

Rename

package Symbol;

=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

BEGIN { require 5.005; }

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

$VERSION = '1.08';

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++;
    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 ($;$) {
    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) = $pkg =~ m/(.*::)(\w+::)$/;
    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};
    }

# delete the symbol table

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