JezK
Edit File: Symbol.pm
package Symbol; use strict; use warnings; 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}; } 1;