X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSymbol.pm;h=a95383a5d68cf4783080a173ac47d0278c8d6b86;hb=190eec7cba34ea20a9dea7228e79de06d80262f7;hp=75d1dfb1fa5621ca6355eb3ee942c6ab77ba2bc9;hpb=7c584b3313a7851a594fef241fac27f0a4e4bbce;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/lib/Symbol.pm b/lib/Symbol.pm
index 75d1dfb..a95383a 100644
--- a/lib/Symbol.pm
+++ b/lib/Symbol.pm
@@ -23,6 +23,15 @@ Symbol - manipulate Perl symbols and their names
     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
@@ -37,31 +46,47 @@ 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 qualfied with
+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.
+
 =cut
 
 BEGIN { require 5.002; }
 
 require Exporter;
 @ISA = qw(Exporter);
+@EXPORT = qw(gensym ungensym qualify qualify_to_ref);
+@EXPORT_OK = qw(delete_package);
 
-@EXPORT = qw(gensym ungensym qualify);
+$VERSION = 1.02;
 
 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" . $genseq++;
-    local *{$genpkg . $name};
-    \delete ${$genpkg}{$name};
+    my $ref = \*{$genpkg . $name};
+    delete $$genpkg{$name};
+    $ref;
 }
 
 sub ungensym ($) {}
@@ -82,4 +107,40 @@ sub qualify ($;$) {
     $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;