X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FClass%2FMOP%2FPackage.pm;h=2c2c0d66e89ad06be95a0a90dcb7d5f83a73a75c;hb=a4bb317200403742305b36bb18db254967d2a798;hp=18c1d142e9e6f2aef8f6014abe7f2b463f491a97;hpb=6d5355c3845e060d269b664be7b4284c606691b8;p=gitmo%2FClass-MOP.git

diff --git a/lib/Class/MOP/Package.pm b/lib/Class/MOP/Package.pm
index 18c1d14..2c2c0d6 100644
--- a/lib/Class/MOP/Package.pm
+++ b/lib/Class/MOP/Package.pm
@@ -4,23 +4,73 @@ package Class::MOP::Package;
 use strict;
 use warnings;
 
+use B;
 use Scalar::Util 'blessed';
 use Carp         'confess';
 
-our $VERSION = '0.01';
+our $VERSION   = '0.76';
+$VERSION = eval $VERSION;
+our $AUTHORITY = 'cpan:STEVAN';
 
-# introspection
-
-sub meta { 
-    require Class::MOP::Class;
-    Class::MOP::Class->initialize(blessed($_[0]) || $_[0]);
-}
+use base 'Class::MOP::Object';
 
 # creation ...
 
 sub initialize {
-    my ($class, $package) = @_;
-    bless { '$:package' => $package } => $class;
+    my ( $class, @args ) = @_;
+
+    unshift @args, "package" if @args % 2;
+
+    my %options = @args;
+    my $package_name = $options{package};
+
+
+    # we hand-construct the class 
+    # until we can bootstrap it
+    if ( my $meta = Class::MOP::get_metaclass_by_name($package_name) ) {
+        return $meta;
+    } else {
+        my $meta = ( ref $class || $class )->_new({
+            'package'   => $package_name,
+            %options,
+        });
+
+        Class::MOP::store_metaclass_by_name($package_name, $meta);
+
+        return $meta;
+    }
+}
+
+sub reinitialize {
+    my ( $class, @args ) = @_;
+
+    unshift @args, "package" if @args % 2;
+
+    my %options = @args;
+    my $package_name = delete $options{package};
+
+    (defined $package_name && $package_name && !blessed($package_name))
+        || confess "You must pass a package name and it cannot be blessed";
+
+    Class::MOP::remove_metaclass_by_name($package_name);
+
+    $class->initialize($package_name, %options); # call with first arg form for compat
+}
+
+sub _new {
+    my $class = shift;
+    my $options = @_ == 1 ? $_[0] : {@_};
+
+    # 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 in the accessor. 
+    # Ideally we could just store a ref and 
+    # it would Just Work, but oh well :\
+    $options->{namespace} ||= \undef;
+
+    bless $options, $class;
 }
 
 # Attributes
@@ -29,104 +79,241 @@ sub initialize {
 # all these attribute readers will be bootstrapped 
 # away in the Class::MOP bootstrap section
 
-sub name { $_[0]->{'$:package'} }
+sub name      { $_[0]->{'package'} }
+sub namespace { 
+    # NOTE:
+    # because of issues with the Perl API 
+    # to the typeglob in some versions, we 
+    # need to just always grab a new 
+    # reference to the hash here. Ideally 
+    # we could just store a ref and it would
+    # Just Work, but oh well :\    
+    no strict 'refs';    
+    \%{$_[0]->{'package'} . '::'} 
+}
+
+# utility methods
+
+{
+    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});
+    }
+}
 
 # Class attributes
 
-my %SIGIL_MAP = (
-    '$' => 'SCALAR',
-    '@' => 'ARRAY',
-    '%' => 'HASH',
-    '&' => 'CODE',
-);
+# ... these functions have to touch the symbol table itself,.. yuk
 
-sub add_package_variable {
+sub add_package_symbol {
     my ($self, $variable, $initial_value) = @_;
-    
-    (defined $variable)
-        || confess "You must pass a variable name";    
-    
-    my ($sigil, $name) = ($variable =~ /^(.)(.*)$/); 
-    
-    (defined $sigil)
-        || confess "The variable name must include a sigil";    
-    
-    (exists $SIGIL_MAP{$sigil})
-        || confess "I do not recognize that sigil '$sigil'";
-    
+
+    my ($name, $sigil, $type) = ref $variable eq 'HASH'
+        ? @{$variable}{qw[name sigil type]}
+        : $self->_deconstruct_variable_name($variable); 
+
+    my $pkg = $self->{'package'};
+
     no strict 'refs';
-    no warnings 'misc';
-    *{$self->name . '::' . $name} = $initial_value;    
+    no warnings 'redefine', 'misc';    
+    *{$pkg . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value;      
+}
+
+sub remove_package_glob {
+    my ($self, $name) = @_;
+    no strict 'refs';        
+    delete ${$self->name . '::'}{$name};     
 }
 
-sub has_package_variable {
+# ... these functions deal with stuff on the namespace level
+
+sub has_package_symbol {
     my ($self, $variable) = @_;
-    (defined $variable)
-        || confess "You must pass a variable name";
 
-    my ($sigil, $name) = ($variable =~ /^(.)(.*)$/); 
+    my ($name, $sigil, $type) = ref $variable eq 'HASH'
+        ? @{$variable}{qw[name sigil type]}
+        : $self->_deconstruct_variable_name($variable);
     
-    (defined $sigil)
-        || confess "The variable name must include a sigil";    
+    my $namespace = $self->namespace;
     
-    (exists $SIGIL_MAP{$sigil})
-        || confess "I do not recognize that sigil '$sigil'";
-    
-    no strict 'refs';
-    defined *{$self->name . '::' . $name}{$SIGIL_MAP{$sigil}} ? 1 : 0;
+    return 0 unless exists $namespace->{$name};   
     
+    # FIXME:
+    # For some really stupid reason 
+    # a typeglob will have a default
+    # value of \undef in the SCALAR 
+    # slot, so we need to work around
+    # this. Which of course means that 
+    # if you put \undef in your scalar
+    # then this is broken.
+
+    if (ref($namespace->{$name}) eq 'SCALAR') {
+        return ($type eq 'CODE');
+    }
+    elsif ($type eq 'SCALAR') {    
+        my $val = *{$namespace->{$name}}{$type};
+        return defined(${$val});
+    }
+    else {
+        defined(*{$namespace->{$name}}{$type});
+    }
 }
 
-sub get_package_variable {
+sub get_package_symbol {
     my ($self, $variable) = @_;    
-    (defined $variable)
-        || confess "You must pass a variable name";
-    
-    my ($sigil, $name) = ($variable =~ /^(.)(.*)$/); 
-    
-    (defined $sigil)
-        || confess "The variable name must include a sigil";    
-    
-    (exists $SIGIL_MAP{$sigil})
-        || confess "I do not recognize that sigil '$sigil'";
-    
-    no strict 'refs';
-    return *{$self->name . '::' . $name}{$SIGIL_MAP{$sigil}};
 
+    my ($name, $sigil, $type) = ref $variable eq 'HASH'
+        ? @{$variable}{qw[name sigil type]}
+        : $self->_deconstruct_variable_name($variable);
+
+    my $namespace = $self->namespace;
+
+    $self->add_package_symbol($variable)
+        unless exists $namespace->{$name};
+
+    if (ref($namespace->{$name}) eq 'SCALAR') {
+        if ($type eq 'CODE') {
+            no strict 'refs';
+            return \&{$self->name.'::'.$name};
+        }
+        else {
+            return undef;
+        }
+    }
+    else {
+        return *{$namespace->{$name}}{$type};
+    }
 }
 
-sub remove_package_variable {
+sub remove_package_symbol {
     my ($self, $variable) = @_;
-    
-    (defined $variable)
-        || confess "You must pass a variable name";
+
+    my ($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";
+    }
         
-    my ($sigil, $name) = ($variable =~ /^(.)(.*)$/); 
-    
-    (defined $sigil)
-        || confess "The variable name must include a sigil";    
+    $self->remove_package_glob($name);
     
-    (exists $SIGIL_MAP{$sigil})
-        || confess "I do not recognize that sigil '$sigil'"; 
+    $self->add_package_symbol($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;
     
-     no strict 'refs';
-     if ($SIGIL_MAP{$sigil} eq 'SCALAR') {
-         undef ${$self->name . '::' . $name};    
-     }
-     elsif ($SIGIL_MAP{$sigil} eq 'ARRAY') {
-         undef @{$self->name . '::' . $name};    
-     }
-     elsif ($SIGIL_MAP{$sigil} eq 'HASH') {
-         undef %{$self->name . '::' . $name};    
-     }
-     elsif ($SIGIL_MAP{$sigil} eq 'CODE') {
-         undef &{$self->name . '::' . $name};    
-     }    
-     else {
-         confess "This should never ever ever happen";
-     }
+    # 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};
+    }
 }
 
+sub get_all_package_symbols {
+    my ($self, $type_filter) = @_;
+
+    die "Cannot call get_all_package_symbols as a class method"
+        unless ref $self;
+
+    my $namespace = $self->namespace;
+
+    return $namespace unless defined $type_filter;
+
+    my %ret;
+    # for some reason this nasty impl is orders of magnitude faster than a clean version
+    if ( $type_filter eq 'CODE' ) {
+        my $pkg;
+        no strict 'refs';
+        %ret = map {
+            (ref($namespace->{$_})
+                ? ( $_ => \&{$pkg ||= $self->name . "::$_"} )
+                : ( ref \$namespace->{$_} eq 'GLOB' # don't use {CODE} unless it's really a glob to prevent stringification of stubs
+                    && (*{$namespace->{$_}}{CODE})  # the extra parents prevent breakage on 5.8.2
+                    ? ( $_ => *{$namespace->{$_}}{CODE} )
+                    : (do {
+                        my $sym = B::svref_2object(\$namespace->{$_});
+                        my $svt = ref $sym if $sym;
+                        ($sym && ($svt eq 'B::PV' || $svt eq 'B::IV'))
+                            ? ($_ => ($pkg ||= $self->name)->can($_))
+                            : () }) ) )
+        } keys %$namespace;
+    } else {
+        %ret = map {
+            $_ => *{$namespace->{$_}}{$type_filter}
+        } grep {
+            !ref($namespace->{$_}) && *{$namespace->{$_}}{$type_filter}
+        } keys %$namespace;
+    }
+
+    return \%ret;
+}
 
 1;
 
@@ -138,41 +325,99 @@ __END__
 
 Class::MOP::Package - Package Meta Object
 
-=head1 SYNOPSIS
-
 =head1 DESCRIPTION
 
+This is an abstraction of a Perl 5 package, it is a superclass of
+L<Class::MOP::Class> and provides all of the symbol table 
+introspection methods.
+
+=head1 INHERITANCE
+
+B<Class::MOP::Package> is a subclass of L<Class::MOP::Object>
+
 =head1 METHODS
 
 =over 4
 
 =item B<meta>
 
-=item B<initialize>
+Returns a metaclass for this package.
+
+=item B<initialize ($package_name)>
+
+This will initialize a Class::MOP::Package instance which represents 
+the package of C<$package_name>.
+
+=item B<reinitialize ($package_name, %options)>
+
+This removes the old metaclass, and creates a new one in it's place.
+Do B<not> use this unless you really know what you are doing, it could
+very easily make a very large mess of your program.
 
 =item B<name>
 
-=item B<add_package_variable>
+This is a read-only attribute which returns the package name for the 
+given instance.
+
+=item B<namespace>
+
+This returns a HASH reference to the symbol table. The keys of the 
+HASH are the symbol names, and the values are typeglob references.
+
+=item B<add_package_symbol ($variable_name, ?$initial_value)>
+
+Given a C<$variable_name>, which must contain a leading sigil, this 
+method will create that variable within the package which houses the 
+class. It also takes an optional C<$initial_value>, which must be a 
+reference of the same type as the sigil of the C<$variable_name> 
+implies.
+
+=item B<get_package_symbol ($variable_name)>
+
+This will return a reference to the package variable in 
+C<$variable_name>. 
+
+=item B<has_package_symbol ($variable_name)>
+
+Returns true (C<1>) if there is a package variable defined for 
+C<$variable_name>, and false (C<0>) otherwise.
+
+=item B<remove_package_symbol ($variable_name)>
+
+This will attempt to remove the package variable at C<$variable_name>.
+
+=item B<remove_package_glob ($glob_name)>
+
+This will attempt to remove the entire typeglob associated with 
+C<$glob_name> from the package. 
+
+=item B<list_all_package_symbols (?$type_filter)>
+
+This will list all the glob names associated with the current package. 
+By inspecting the globs returned you can discern all the variables in 
+the package.
 
-=item B<get_package_variable>
+By passing a C<$type_filter>, you can limit the list to only those 
+which match the filter (either SCALAR, ARRAY, HASH or CODE).
 
-=item B<has_package_variable>
+=item B<get_all_package_symbols (?$type_filter)>
 
-=item B<remove_package_variable>
+Works exactly like C<list_all_package_symbols> but returns a HASH of 
+name => thing mapping instead of just an ARRAY of names.
 
 =back
 
-=head1 AUTHOR
+=head1 AUTHORS
 
 Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2008 by Infinity Interactive, Inc.
 
 L<http://www.iinteractive.com>
 
 This library is free software; you can redistribute it and/or modify
 it under the same terms as Perl itself.
 
-=cut
\ No newline at end of file
+=cut