Re: Réf. : Re: PATCH proposal for ext/Safe/safe2.t

[perl5.git] / lib / Symbol.pm

diff --git a/lib/Symbol.pm b/lib/Symbol.pm
index 15c211c..98fb676 100644 (file)
--- a/lib/Symbol.pm
+++ b/lib/Symbol.pm
@@ -15,6 +15,9 @@ Symbol - manipulate Perl symbols and their names
 
     ungensym $sym;      # no effect
 
+    # replace *FOO{IO} handle but not $FOO, %FOO, etc.
+    *FOO = geniosym;
+
     print qualify("x"), "\n";              # "Test::x"
     print qualify("x", "FOO"), "\n"        # "FOO::x"
     print qualify("BAR::x"), "\n";         # "BAR::x"
@@ -42,6 +45,10 @@ 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;
@@ -63,14 +70,14 @@ explicitly.
 
 =cut
 
-BEGIN { require 5.002; }
+BEGIN { require 5.005; }
 
 require Exporter;
 @ISA = qw(Exporter);
 @EXPORT = qw(gensym ungensym qualify qualify_to_ref);
-@EXPORT_OK = qw(delete_package);
+@EXPORT_OK = qw(delete_package geniosym);
 
-$VERSION = 1.03;
+$VERSION = 1.04;
 
 my $genpkg = "Symbol::";
 my $genseq = 0;
@@ -89,14 +96,23 @@ sub gensym () {
     $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 $pkg;
-       # Global names: special character, "^x", or other. 
-       if ($name =~ /^([^a-z])|(\^[a-z])$/i || $global{$name}) {
+       # 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 {