mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-23 06:27:55 +00:00
92 lines
2 KiB
Perl
92 lines
2 KiB
Perl
|
package Symbol;
|
||
|
|
|
||
|
|
BEGIN { require 5.005; }
|
||
|
|
|
||
|
|
require Exporter;
|
||
|
|
@ISA = qw(Exporter);
|
||
|
|
@EXPORT = qw(gensym ungensym qualify qualify_to_ref);
|
||
|
|
@EXPORT_OK = qw(delete_package geniosym);
|
||
|
|
|
||
|
|
$VERSION = '1.07';
|
||
|
|
|
||
|
|
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};
|
||
|
|
}
|
||
|
|
|
||
|
|
1;
|