Symbol - manipulate Perl symbols and their names
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::'};
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, Symbol::ungensym is also provided.
But it doesn't do anything.
Symbol::geniosym creates an anonymous IO handle. This can be
assigned into an existing glob without affecting the non-IO portions
of the glob.
Symbol::qualify turns unqualified symbol names into qualified
variable names (e.g. ``myvar'' -> ``MyPackage::myvar''). If it is given a
second parameter, 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.
Symbol::qualify_to_ref is just like Symbol::qualify except that it
returns a glob ref rather than a symbol name, so you can use the result
even if use strict 'refs' is in effect.
Symbol::delete_package wipes out a whole package namespace. Note
this routine is not exported by default--you may want to import it
explicitly.
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 Foo may stop working after you delete Foo , even if
you reload the Foo module afterwards.
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