package Stash::Manip;
-use Moose;
+use strict;
+use warnings;
+
+use Carp qw(confess);
+use Scalar::Util qw(reftype);
=head1 NAME
=cut
-__PACKAGE__->meta->make_immutable;
-no Moose;
+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
projects / gitmo/Package-Stash.git / blobdiff