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package Stash::Manip;
use strict;
use warnings;
use Carp qw(confess);
use Scalar::Util qw(reftype);
=head1 NAME
Stash::Manip -
=head1 SYNOPSIS
=head1 DESCRIPTION
=cut
sub new {
my $class = shift;
my ($namespace) = @_;
return bless { package => $namespace }, $class;
}
sub name {
return $_[0]->{package};
}
sub namespace {
# NOTE:
# because of issues with the Perl API
# to the typeglob in some versions, we
# need to just always grab a new
# reference to the hash here. Ideally
# we could just store a ref and it would
# Just Work, but oh well :\
no strict 'refs';
return \%{$_[0]->name . '::'};
}
{
my %SIGIL_MAP = (
'$' => 'SCALAR',
'@' => 'ARRAY',
'%' => 'HASH',
'&' => 'CODE',
);
sub _deconstruct_variable_name {
my ($self, $variable) = @_;
(defined $variable)
|| confess "You must pass a variable name";
my $sigil = substr($variable, 0, 1, '');
(defined $sigil)
|| confess "The variable name must include a sigil";
(exists $SIGIL_MAP{$sigil})
|| confess "I do not recognize that sigil '$sigil'";
return ($variable, $sigil, $SIGIL_MAP{$sigil});
}
}
sub add_package_symbol {
my ($self, $variable, $initial_value) = @_;
my ($name, $sigil, $type) = ref $variable eq 'HASH'
? @{$variable}{qw[name sigil type]}
: $self->_deconstruct_variable_name($variable);
my $pkg = $self->name;
no strict 'refs';
no warnings 'redefine', 'misc', 'prototype';
*{$pkg . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value;
}
sub remove_package_glob {
my ($self, $name) = @_;
no strict 'refs';
delete ${$self->name . '::'}{$name};
}
# ... these functions deal with stuff on the namespace level
sub has_package_symbol {
my ($self, $variable) = @_;
my ($name, $sigil, $type) = ref $variable eq 'HASH'
? @{$variable}{qw[name sigil type]}
: $self->_deconstruct_variable_name($variable);
my $namespace = $self->namespace;
return unless exists $namespace->{$name};
my $entry_ref = \$namespace->{$name};
if (reftype($entry_ref) eq 'GLOB') {
if ( $type eq 'SCALAR' ) {
return defined ${ *{$entry_ref}{SCALAR} };
}
else {
return defined *{$entry_ref}{$type};
}
}
else {
# a symbol table entry can be -1 (stub), string (stub with prototype),
# or reference (constant)
return $type eq 'CODE';
}
}
sub get_package_symbol {
my ($self, $variable) = @_;
my ($name, $sigil, $type) = ref $variable eq 'HASH'
? @{$variable}{qw[name sigil type]}
: $self->_deconstruct_variable_name($variable);
my $namespace = $self->namespace;
# FIXME
$self->add_package_symbol($variable)
unless exists $namespace->{$name};
my $entry_ref = \$namespace->{$name};
if (ref($entry_ref) eq 'GLOB') {
return *{$entry_ref}{$type};
}
else {
if ($type eq 'CODE') {
no strict 'refs';
return \&{ $self->name . '::' . $name };
}
else {
return undef;
}
}
}
sub remove_package_symbol {
my ($self, $variable) = @_;
my ($name, $sigil, $type) = ref $variable eq 'HASH'
? @{$variable}{qw[name sigil type]}
: $self->_deconstruct_variable_name($variable);
# FIXME:
# no doubt this is grossly inefficient and
# could be done much easier and faster in XS
my ($scalar_desc, $array_desc, $hash_desc, $code_desc) = (
{ sigil => '$', type => 'SCALAR', name => $name },
{ sigil => '@', type => 'ARRAY', name => $name },
{ sigil => '%', type => 'HASH', name => $name },
{ sigil => '&', type => 'CODE', name => $name },
);
my ($scalar, $array, $hash, $code);
if ($type eq 'SCALAR') {
$array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc);
$hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc);
$code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc);
}
elsif ($type eq 'ARRAY') {
$scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc);
$hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc);
$code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc);
}
elsif ($type eq 'HASH') {
$scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc);
$array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc);
$code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc);
}
elsif ($type eq 'CODE') {
$scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc);
$array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc);
$hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc);
}
else {
confess "This should never ever ever happen";
}
$self->remove_package_glob($name);
$self->add_package_symbol($scalar_desc => $scalar) if defined $scalar;
$self->add_package_symbol($array_desc => $array) if defined $array;
$self->add_package_symbol($hash_desc => $hash) if defined $hash;
$self->add_package_symbol($code_desc => $code) if defined $code;
}
sub list_all_package_symbols {
my ($self, $type_filter) = @_;
my $namespace = $self->namespace;
return keys %{$namespace} unless defined $type_filter;
# NOTE:
# or we can filter based on
# type (SCALAR|ARRAY|HASH|CODE)
if ($type_filter eq 'CODE') {
return grep {
(ref($namespace->{$_})
? (ref($namespace->{$_}) eq 'SCALAR')
: (ref(\$namespace->{$_}) eq 'GLOB'
&& defined(*{$namespace->{$_}}{CODE})));
} keys %{$namespace};
} else {
return grep { *{$namespace->{$_}}{$type_filter} } keys %{$namespace};
}
}
=head1 BUGS
No known bugs.
Please report any bugs through RT: email
C<bug-stash-manip at rt.cpan.org>, or browse to
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Stash-Manip>.
=head1 SEE ALSO
=head1 SUPPORT
You can find this documentation for this module with the perldoc command.
perldoc Stash::Manip
You can also look for information at:
=over 4
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Stash-Manip>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Stash-Manip>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Stash-Manip>
=item * Search CPAN
L<http://search.cpan.org/dist/Stash-Manip>
=back
=head1 AUTHOR
Jesse Luehrs <doy at tozt dot net>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by Jesse Luehrs.
This is free software; you can redistribute it and/or modify it under
the same terms as perl itself.
=cut
1;
|
