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package Package::Stash::PP; use strict; use warnings; # ABSTRACT: Pure perl implementation of the Package::Stash API our $VERSION = '0.40'; use B; use Carp qw(confess); use Scalar::Util qw(blessed reftype weaken); use Symbol; # before 5.12, assigning to the ISA glob would make it lose its magical ->isa # powers use constant BROKEN_ISA_ASSIGNMENT => ($] < 5.012); # before 5.10, stashes don't ever seem to drop to a refcount of zero, so # weakening them isn't helpful use constant BROKEN_WEAK_STASH => ($] < 5.010); # before 5.10, the scalar slot was always treated as existing if the # glob existed use constant BROKEN_SCALAR_INITIALIZATION => ($] < 5.010); # add_method on anon stashes triggers rt.perl #1804 otherwise # fixed in perl commit v5.13.3-70-g0fe688f use constant BROKEN_GLOB_ASSIGNMENT => ($] < 5.013004); # pre-5.10, ->isa lookups were cached in the ::ISA::CACHE:: slot use constant HAS_ISA_CACHE => ($] < 5.010); #pod =head1 SYNOPSIS #pod #pod use Package::Stash; #pod #pod =head1 DESCRIPTION #pod #pod This is a backend for L<Package::Stash> implemented in pure perl, for those without a compiler or who would like to use this inline in scripts. #pod #pod =cut sub new { my $class = shift; my ($package) = @_; if (!defined($package) || (ref($package) && reftype($package) ne 'HASH')) { confess "Package::Stash->new must be passed the name of the " . "package to access"; } elsif (ref($package) && reftype($package) eq 'HASH') { confess "The PP implementation of Package::Stash does not support " . "anonymous stashes before perl 5.14" if BROKEN_GLOB_ASSIGNMENT; return bless { 'namespace' => $package, }, $class; } elsif ($package =~ /\A[0-9A-Z_a-z]+(?:::[0-9A-Z_a-z]+)*\z/) { return bless { 'package' => $package, }, $class; } else { confess "$package is not a module name"; } } sub name { confess "Can't call name as a class method" unless blessed($_[0]); confess "Can't get the name of an anonymous package" unless defined($_[0]->{package}); return $_[0]->{package}; } sub namespace { confess "Can't call namespace as a class method" unless blessed($_[0]); if (BROKEN_WEAK_STASH) { no strict 'refs'; return \%{$_[0]->name . '::'}; } else { return $_[0]->{namespace} if defined $_[0]->{namespace}; { no strict 'refs'; $_[0]->{namespace} = \%{$_[0]->name . '::'}; } weaken($_[0]->{namespace}); return $_[0]->{namespace}; } } { my %SIGIL_MAP = ( '$' => 'SCALAR', '@' => 'ARRAY', '%' => 'HASH', '&' => 'CODE', '' => 'IO', ); sub _deconstruct_variable_name { my ($variable) = @_; my @ret; if (ref($variable) eq 'HASH') { @ret = @{$variable}{qw[name sigil type]}; } else { (defined $variable && length $variable) || confess "You must pass a variable name"; my $sigil = substr($variable, 0, 1, ''); if (exists $SIGIL_MAP{$sigil}) { @ret = ($variable, $sigil, $SIGIL_MAP{$sigil}); } else { @ret = ("${sigil}${variable}", '', $SIGIL_MAP{''}); } } # XXX in pure perl, this will access things in inner packages, # in xs, this will segfault - probably look more into this at # some point ($ret[0] !~ /::/) || confess "Variable names may not contain ::"; return @ret; } } sub _valid_for_type { my ($value, $type) = @_; if ($type eq 'HASH' || $type eq 'ARRAY' || $type eq 'IO' || $type eq 'CODE') { return reftype($value) eq $type; } else { my $ref = reftype($value); return !defined($ref) || $ref eq 'SCALAR' || $ref eq 'REF' || $ref eq 'LVALUE' || $ref eq 'REGEXP' || $ref eq 'VSTRING'; } } sub add_symbol { my ($self, $variable, $initial_value, %opts) = @_; my ($name, $sigil, $type) = _deconstruct_variable_name($variable); if (@_ > 2) { _valid_for_type($initial_value, $type) || confess "$initial_value is not of type $type"; # cheap fail-fast check for PERLDBf_SUBLINE and '&' if ($^P and $^P & 0x10 && $sigil eq '&') { my $filename = $opts{filename}; my $first_line_num = $opts{first_line_num}; (undef, $filename, $first_line_num) = caller if not defined $filename; my $last_line_num = $opts{last_line_num} || ($first_line_num ||= 0); # http://perldoc.perl.org/perldebguts.html#Debugger-Internals $DB::sub{$self->name . '::' . $name} = "$filename:$first_line_num-$last_line_num"; } } if (BROKEN_GLOB_ASSIGNMENT) { if (@_ > 2) { no strict 'refs'; no warnings 'redefine'; *{ $self->name . '::' . $name } = ref $initial_value ? $initial_value : \$initial_value; } else { no strict 'refs'; if (BROKEN_ISA_ASSIGNMENT && $name eq 'ISA') { *{ $self->name . '::' . $name }; } else { my $undef = _undef_ref_for_type($type); *{ $self->name . '::' . $name } = $undef; } } } else { my $namespace = $self->namespace; { # using glob aliasing instead of Symbol::gensym, because otherwise, # magic doesn't get applied properly. # see <20120710063744.19360.qmail@lists-nntp.develooper.com> on p5p local *__ANON__:: = $namespace; no strict 'refs'; no warnings 'void'; no warnings 'once'; *{"__ANON__::$name"}; } if (@_ > 2) { no warnings 'redefine'; *{ $namespace->{$name} } = ref $initial_value ? $initial_value : \$initial_value; } else { return if BROKEN_ISA_ASSIGNMENT && $name eq 'ISA'; *{ $namespace->{$name} } = _undef_ref_for_type($type); } } } sub _undef_ref_for_type { my ($type) = @_; if ($type eq 'ARRAY') { return []; } elsif ($type eq 'HASH') { return {}; } elsif ($type eq 'SCALAR') { return \undef; } elsif ($type eq 'IO') { return Symbol::geniosym; } elsif ($type eq 'CODE') { confess "Don't know how to vivify CODE variables"; } else { confess "Unknown type $type in vivication"; } } sub remove_glob { my ($self, $name) = @_; delete $self->namespace->{$name}; } sub has_symbol { my ($self, $variable) = @_; my ($name, $sigil, $type) = _deconstruct_variable_name($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') { if (BROKEN_SCALAR_INITIALIZATION) { return defined ${ *{$entry_ref}{$type} }; } else { my $sv = B::svref_2object($entry_ref)->SV; return $sv->isa('B::SV') || ($sv->isa('B::SPECIAL') && $B::specialsv_name[$$sv] ne 'Nullsv'); } } else { return defined *{$entry_ref}{$type}; } } else { # a symbol table entry can be -1 (stub), string (stub with prototype), # or reference (constant) return $type eq 'CODE'; } } sub get_symbol { my ($self, $variable, %opts) = @_; my ($name, $sigil, $type) = _deconstruct_variable_name($variable); my $namespace = $self->namespace; if (!exists $namespace->{$name}) { if ($opts{vivify}) { $self->add_symbol($variable); } else { return undef; } } my $entry_ref = \$namespace->{$name}; if (ref($entry_ref) eq 'GLOB') { return *{$entry_ref}{$type}; } else { if ($type eq 'CODE') { if (BROKEN_GLOB_ASSIGNMENT || defined($self->{package})) { no strict 'refs'; return \&{ $self->name . '::' . $name }; } # XXX we should really be able to support arbitrary anonymous # stashes here... (not just via Package::Anon) if (blessed($namespace) && $namespace->isa('Package::Anon')) { # ->can will call gv_init for us, which inflates the glob # don't know how to do this in general $namespace->bless(\(my $foo))->can($name); } else { confess "Don't know how to inflate a " . ref($entry_ref) . " into a full coderef (perhaps you could use" . " Package::Anon instead of a bare stash?)" } return *{ $namespace->{$name} }{CODE}; } else { return undef; } } } sub get_or_add_symbol { my $self = shift; $self->get_symbol(@_, vivify => 1); } sub remove_symbol { my ($self, $variable) = @_; my ($name, $sigil, $type) = _deconstruct_variable_name($variable); # FIXME: # no doubt this is grossly inefficient and # could be done much easier and faster in XS my %desc = ( SCALAR => { sigil => '$', type => 'SCALAR', name => $name }, ARRAY => { sigil => '@', type => 'ARRAY', name => $name }, HASH => { sigil => '%', type => 'HASH', name => $name }, CODE => { sigil => '&', type => 'CODE', name => $name }, IO => { sigil => '', type => 'IO', name => $name }, ); confess "This should never ever ever happen" if !$desc{$type}; my @types_to_store = grep { $type ne $_ && $self->has_symbol($desc{$_}) } keys %desc; my %values = map { $_, $self->get_symbol($desc{$_}) } @types_to_store; $values{SCALAR} = $self->get_symbol($desc{SCALAR}) if !defined $values{SCALAR} && $type ne 'SCALAR' && BROKEN_SCALAR_INITIALIZATION; $self->remove_glob($name); $self->add_symbol($desc{$_} => $values{$_}) for grep { defined $values{$_} } keys %values; } sub list_all_symbols { my ($self, $type_filter) = @_; my $namespace = $self->namespace; if (HAS_ISA_CACHE) { return grep { $_ ne '::ISA::CACHE::' } keys %{$namespace} unless defined $type_filter; } else { return keys %{$namespace} unless defined $type_filter; } # NOTE: # or we can filter based on # type (SCALAR|ARRAY|HASH|CODE) if ($type_filter eq 'CODE') { return grep { # any non-typeglob in the symbol table is a constant or stub ref(\$namespace->{$_}) ne 'GLOB' # regular subs are stored in the CODE slot of the typeglob || defined(*{$namespace->{$_}}{CODE}) } keys %{$namespace}; } elsif ($type_filter eq 'SCALAR') { return grep { !(HAS_ISA_CACHE && $_ eq '::ISA::CACHE::') && (BROKEN_SCALAR_INITIALIZATION ? (ref(\$namespace->{$_}) eq 'GLOB' && defined(${*{$namespace->{$_}}{'SCALAR'}})) : (do { my $entry = \$namespace->{$_}; ref($entry) eq 'GLOB' && B::svref_2object($entry)->SV->isa('B::SV') })) } keys %{$namespace}; } else { return grep { ref(\$namespace->{$_}) eq 'GLOB' && defined(*{$namespace->{$_}}{$type_filter}) } keys %{$namespace}; } } sub get_all_symbols { my ($self, $type_filter) = @_; my $namespace = $self->namespace; return { %{$namespace} } unless defined $type_filter; return { map { $_ => $self->get_symbol({name => $_, type => $type_filter}) } $self->list_all_symbols($type_filter) } } __END__ =pod =encoding UTF-8 =head1 NAME Package::Stash::PP - Pure perl implementation of the Package::Stash API =head1 VERSION version 0.40 =head1 SYNOPSIS use Package::Stash; =head1 DESCRIPTION This is a backend for L<Package::Stash> implemented in pure perl, for those without a compiler or who would like to use this inline in scripts. =head1 BUGS =for stopwords TODO =over 4 =item * remove_symbol also replaces the associated typeglob This can cause unexpected behavior when doing manipulation at compile time - removing subroutines will still allow them to be called from within the package as subroutines (although they will not be available as methods). This can be considered a feature in some cases (this is how L<namespace::clean> works, for instance), but should not be relied upon - use C<remove_glob> directly if you want this behavior. =item * Some minor memory leaks The pure perl implementation has a couple minor memory leaks (see the TODO tests in t/20-leaks.t) that I'm having a hard time tracking down - these may be core perl bugs, it's hard to tell. =back =head1 SEE ALSO =over 4 =item * L<Class::MOP::Package> This module is a factoring out of code that used to live here =back =for Pod::Coverage BROKEN_ISA_ASSIGNMENT add_symbol get_all_symbols get_or_add_symbol get_symbol has_symbol list_all_symbols name namespace new remove_glob =head1 SUPPORT Bugs may be submitted through L<the RT bug tracker|https://rt.cpan.org/Public/Dist/Display.html?Name=Package-Stash> (or L<bug-Package-Stash@rt.cpan.org|mailto:bug-Package-Stash@rt.cpan.org>). =head1 AUTHOR Mostly copied from code from L<Class::MOP::Package>, by Stevan Little and the Moose Cabal. =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2022 by Jesse Luehrs. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =cut