use strict;
use warnings;
use Carp ();
-use Class::Inspector ();
use Scalar::Util ();
-use MRO::Compat;
-use Sub::Name ();
+use Module::Runtime ();
-our $VERSION = '0.09000';
+BEGIN {
+ # use M::R to work around the 5.8 require bugs
+ if ($] < 5.009_005) {
+ Module::Runtime::require_module('MRO::Compat');
+ }
+ else {
+ require mro;
+ }
+}
+
+our $VERSION = '0.10007';
+$VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases
+
+# when changing minimum version don't forget to adjust Makefile.PL as well
+our $__minimum_xsa_version;
+BEGIN { $__minimum_xsa_version = '1.15' }
+
+our $USE_XS;
+# the unless defined is here so that we can override the value
+# before require/use, *regardless* of the state of $ENV{CAG_USE_XS}
+$USE_XS = $ENV{CAG_USE_XS}
+ unless defined $USE_XS;
BEGIN {
- our $hasXS;
-
- sub _hasXS {
- return $hasXS if defined $hasXS;
-
- $hasXS = 0;
- eval {
- require Class::XSAccessor;
- $hasXS = 1;
- };
-
- return $hasXS;
- }
+ package # hide from PAUSE
+ __CAG_ENV__;
+
+ die "Huh?! No minimum C::XSA version?!\n"
+ unless $__minimum_xsa_version;
+
+ local $@;
+ require constant;
+
+ # individual (one const at a time) imports so we are 5.6.2 compatible
+ # if we can - why not ;)
+ constant->import( NO_SUBNAME => eval {
+ Module::Runtime::require_module('Sub::Name')
+ } ? 0 : "$@" );
+
+ my $found_cxsa;
+ constant->import( NO_CXSA => ( !NO_SUBNAME() and eval {
+ Module::Runtime::require_module('Class::XSAccessor');
+ $found_cxsa = Class::XSAccessor->VERSION;
+ Class::XSAccessor->VERSION($__minimum_xsa_version);
+ } ) ? 0 : "$@" );
+
+ if (NO_CXSA() and $found_cxsa and !$ENV{CAG_OLD_XS_NOWARN}) {
+ warn(
+ 'The installed version of Class::XSAccessor is too old '
+ . "(v$found_cxsa < v$__minimum_xsa_version). Please upgrade "
+ . "to instantly quadruple the performance of 'simple' accessors. "
+ . 'Set $ENV{CAG_OLD_XS_NOWARN} if you wish to disable this '
+ . "warning.\n"
+ );
+ }
+
+ constant->import( BROKEN_GOTO => ($] < '5.008009') ? 1 : 0 );
+
+ constant->import( UNSTABLE_DOLLARAT => ($] < '5.013002') ? 1 : 0 );
+
+ constant->import( TRACK_UNDEFER_FAIL => (
+ $INC{'Test/Builder.pm'} || $INC{'Test/Builder2.pm'}
+ and
+ $0 =~ m|^ x?t / .+ \.t $|x
+ ) ? 1 : 0 );
}
+# Yes this method is undocumented
+# Yes it should be a private coderef like all the rest at the end of this file
+# No we can't do that (yet) because the DBIC-CDBI compat layer overrides it
+# %$*@!?&!&#*$!!!
+sub _mk_group_accessors {
+ my($self, $maker, $group, @fields) = @_;
+ my $class = length (ref ($self) ) ? ref ($self) : $self;
+
+ no strict 'refs';
+ no warnings 'redefine';
+
+ # So we don't have to do lots of lookups inside the loop.
+ $maker = $self->can($maker) unless ref $maker;
+
+ for (@fields) {
+
+ my ($name, $field) = (ref $_) ? (@$_) : ($_, $_);
+
+ Carp::croak("Illegal accessor name '$name'")
+ unless $name =~ /\A[A-Z_a-z][0-9A-Z_a-z]*\z/;
+
+ Carp::carp("Having a data accessor named '$name' in '$class' is unwise.")
+ if $name =~ /\A(?: DESTROY | AUTOLOAD | CLONE )\z/x;
+
+ my $alias = "_${name}_accessor";
+
+ for ($name, $alias) {
+
+ # the maker may elect to not return anything, meaning it already
+ # installed the coderef for us (e.g. lack of Sub::Name)
+ my $cref = $self->$maker($group, $field, $_)
+ or next;
+
+ my $fq_meth = "${class}::$_";
+
+ *$fq_meth = Sub::Name::subname($fq_meth, $cref);
+ #unless defined &{$class."\:\:$field"}
+ }
+ }
+};
+
+# $gen_accessor coderef is setup at the end for clarity
+my $gen_accessor;
+
=head1 NAME
Class::Accessor::Grouped - Lets you build groups of accessors
=head1 SYNOPSIS
+ use base 'Class::Accessor::Grouped';
+
+ # make basic accessors for objects
+ __PACKAGE__->mk_group_accessors(simple => qw(id name email));
+
+ # make accessor that works for objects and classes
+ __PACKAGE__->mk_group_accessors(inherited => 'awesome_level');
+
=head1 DESCRIPTION
This class lets you build groups of accessors that will call different
=head2 mk_group_accessors
+ __PACKAGE__->mk_group_accessors(simple => 'hair_length', [ hair_color => 'hc' ]);
+
=over 4
=item Arguments: $group, @fieldspec
return;
}
-
-{
- no strict 'refs';
- no warnings 'redefine';
-
- sub _mk_group_accessors {
- my($self, $maker, $group, @fields) = @_;
- my $class = Scalar::Util::blessed $self || $self;
-
- # So we don't have to do lots of lookups inside the loop.
- $maker = $self->can($maker) unless ref $maker;
-
- my $hasXS = _hasXS();
-
- foreach my $field (@fields) {
- if( $field eq 'DESTROY' ) {
- Carp::carp("Having a data accessor named DESTROY in ".
- "'$class' is unwise.");
- }
-
- my $name = $field;
-
- ($name, $field) = @$field if ref $field;
-
- my $alias = "_${name}_accessor";
- my $full_name = join('::', $class, $name);
- my $full_alias = join('::', $class, $alias);
-
- if ( $hasXS && $group eq 'simple' ) {
- Class::XSAccessor::newxs_accessor("${class}::${name}", $field, 0);
- Class::XSAccessor::newxs_accessor("${class}::${alias}", $field, 0);
-
- # XXX: is the alias accessor really necessary?
- }
- else {
- my $accessor = $self->$maker($group, $field);
- my $alias_accessor = $self->$maker($group, $field);
-
- *$full_name = Sub::Name::subname($full_name, $accessor);
- #unless defined &{$class."\:\:$field"}
-
- *$full_alias = Sub::Name::subname($full_alias, $alias_accessor);
- #unless defined &{$class."\:\:$alias"}
- }
- }
- }
-}
-
=head2 mk_group_ro_accessors
+ __PACKAGE__->mk_group_ro_accessors(simple => 'birthdate', [ social_security_number => 'ssn' ]);
+
=over 4
=item Arguments: $group, @fieldspec
=cut
sub mk_group_ro_accessors {
- my($self, $group, @fields) = @_;
+ my($self, $group, @fields) = @_;
- $self->_mk_group_accessors('make_group_ro_accessor', $group, @fields);
+ $self->_mk_group_accessors('make_group_ro_accessor', $group, @fields);
+ return;
}
=head2 mk_group_wo_accessors
+ __PACKAGE__->mk_group_wo_accessors(simple => 'lie', [ subject => 'subj' ]);
+
=over 4
=item Arguments: $group, @fieldspec
=cut
sub mk_group_wo_accessors {
- my($self, $group, @fields) = @_;
-
- $self->_mk_group_accessors('make_group_wo_accessor', $group, @fields);
-}
-
-=head2 make_group_accessor
+ my($self, $group, @fields) = @_;
-=over 4
-
-=item Arguments: $group, $field
-
-Returns: $sub (\CODE)
-
-=back
-
-Returns a single accessor in a given group; called by mk_group_accessors
-for each entry in @fieldspec.
-
-=cut
-
-sub make_group_accessor {
- my ($class, $group, $field) = @_;
-
- my $set = "set_$group";
- my $get = "get_$group";
-
- # eval for faster fastiness
- return eval "sub {
- if(\@_ > 1) {
- return shift->$set('$field', \@_);
- }
- else {
- return shift->$get('$field');
- }
- };"
-}
-
-=head2 make_group_ro_accessor
-
-=over 4
-
-=item Arguments: $group, $field
-
-Returns: $sub (\CODE)
-
-=back
-
-Returns a single read-only accessor in a given group; called by
-mk_group_ro_accessors for each entry in @fieldspec.
-
-=cut
-
-sub make_group_ro_accessor {
- my($class, $group, $field) = @_;
-
- my $get = "get_$group";
-
- return eval "sub {
- if(\@_ > 1) {
- my \$caller = caller;
- Carp::croak(\"'\$caller' cannot alter the value of '$field' on \".
- \"objects of class '$class'\");
- }
- else {
- return shift->$get('$field');
- }
- };"
-}
-
-=head2 make_group_wo_accessor
-
-=over 4
-
-=item Arguments: $group, $field
-
-Returns: $sub (\CODE)
-
-=back
-
-Returns a single write-only accessor in a given group; called by
-mk_group_wo_accessors for each entry in @fieldspec.
-
-=cut
-
-sub make_group_wo_accessor {
- my($class, $group, $field) = @_;
-
- my $set = "set_$group";
-
- return eval "sub {
- unless (\@_ > 1) {
- my \$caller = caller;
- Carp::croak(\"'\$caller' cannot access the value of '$field' on \".
- \"objects of class '$class'\");
- }
- else {
- return shift->$set('$field', \@_);
- }
- };"
+ $self->_mk_group_accessors('make_group_wo_accessor', $group, @fields);
+ return;
}
=head2 get_simple
=cut
sub get_simple {
- return $_[0]->{$_[1]};
+ $_[0]->{$_[1]};
}
=head2 set_simple
=cut
sub set_simple {
- return $_[0]->{$_[1]} = $_[2];
+ $_[0]->{$_[1]} = $_[2];
}
=cut
sub get_inherited {
- my $class;
-
- if (Scalar::Util::blessed $_[0]) {
- my $reftype = Scalar::Util::reftype $_[0];
- $class = ref $_[0];
-
- if ($reftype eq 'HASH' && exists $_[0]->{$_[1]}) {
- return $_[0]->{$_[1]};
- } elsif ($reftype ne 'HASH') {
- Carp::croak('Cannot get inherited value on an object instance that is not hash-based');
- };
- } else {
- $class = $_[0];
- };
+ if ( length (ref ($_[0]) ) ) {
+ if (Scalar::Util::reftype $_[0] eq 'HASH') {
+ return $_[0]->{$_[1]} if exists $_[0]->{$_[1]};
+ # everything in @_ is aliased, an assignment won't work
+ splice @_, 0, 1, ref($_[0]);
+ }
+ else {
+ Carp::croak('Cannot get inherited value on an object instance that is not hash-based');
+ }
+ }
- no strict 'refs';
- no warnings qw/uninitialized/;
- return ${$class.'::__cag_'.$_[1]} if defined(${$class.'::__cag_'.$_[1]});
+ # if we got this far there is nothing in the instance
+ # OR this is a class call
+ # in any case $_[0] contains the class name (see splice above)
+ no strict 'refs';
+ no warnings 'uninitialized';
- # we need to be smarter about recalculation, as @ISA (thus supers) can very well change in-flight
- my $pkg_gen = mro::get_pkg_gen ($class);
- if ( ${$class.'::__cag_pkg_gen'} != $pkg_gen ) {
- @{$class.'::__cag_supers'} = $_[0]->get_super_paths;
- ${$class.'::__cag_pkg_gen'} = $pkg_gen;
- };
+ my $cag_slot = '::__cag_'. $_[1];
+ return ${$_[0].$cag_slot} if defined(${$_[0].$cag_slot});
- foreach (@{$class.'::__cag_supers'}) {
- return ${$_.'::__cag_'.$_[1]} if defined(${$_.'::__cag_'.$_[1]});
- };
+ do { return ${$_.$cag_slot} if defined(${$_.$cag_slot}) }
+ for $_[0]->get_super_paths;
- return undef;
+ return undef;
}
=head2 set_inherited
=cut
sub set_inherited {
- if (Scalar::Util::blessed $_[0]) {
- if (Scalar::Util::reftype $_[0] eq 'HASH') {
- return $_[0]->{$_[1]} = $_[2];
- } else {
- Carp::croak('Cannot set inherited value on an object instance that is not hash-based');
- };
+ if (length (ref ($_[0]) ) ) {
+ if (Scalar::Util::reftype $_[0] eq 'HASH') {
+ return $_[0]->{$_[1]} = $_[2];
} else {
- no strict 'refs';
-
- return ${$_[0].'::__cag_'.$_[1]} = $_[2];
+ Carp::croak('Cannot set inherited value on an object instance that is not hash-based');
};
+ }
+
+ no strict 'refs';
+ ${$_[0].'::__cag_'.$_[1]} = $_[2];
}
=head2 get_component_class
Gets the value of the specified component class.
- __PACKAGE__->mk_group_accessors('component_class' => 'result_class');
+ __PACKAGE__->mk_group_accessors('component_class' => 'result_class');
- $self->result_class->method();
+ $self->result_class->method();
- ## same as
- $self->get_component_class('result_class')->method();
+ ## same as
+ $self->get_component_class('result_class')->method();
=cut
sub get_component_class {
- return $_[0]->get_inherited($_[1]);
+ $_[0]->get_inherited($_[1]);
};
=head2 set_component_class
Inherited accessor that automatically loads the specified class before setting
it. This method will die if the specified class could not be loaded.
- __PACKAGE__->mk_group_accessors('component_class' => 'result_class');
- __PACKAGE__->result_class('MyClass');
+ __PACKAGE__->mk_group_accessors('component_class' => 'result_class');
+ __PACKAGE__->result_class('MyClass');
- $self->result_class->method();
+ $self->result_class->method();
=cut
sub set_component_class {
- if ($_[2]) {
- local $^W = 0;
- if (Class::Inspector->installed($_[2]) && !Class::Inspector->loaded($_[2])) {
- eval "use $_[2]";
+ if (defined $_[2] and length $_[2]) {
+ # disable warnings, and prevent $_ being eaten away by a behind-the-scenes
+ # module loading
+ local ($^W, $_);
+
+ if (__CAG_ENV__::UNSTABLE_DOLLARAT) {
+ my $err;
+ {
+ local $@;
+ eval { Module::Runtime::use_package_optimistically($_[2]) }
+ or $err = $@;
+ }
+ Carp::croak("Could not load $_[1] '$_[2]': $err") if defined $err;
- Carp::croak("Could not load $_[1] '$_[2]': ", $@) if $@;
- };
- };
+ }
+ else {
+ eval { Module::Runtime::use_package_optimistically($_[2]) }
+ or Carp::croak("Could not load $_[1] '$_[2]': $@");
+ }
+ };
- return $_[0]->set_inherited($_[1], $_[2]);
+ $_[0]->set_inherited($_[1], $_[2]);
};
+=head1 INTERNAL METHODS
+
+These methods are documented for clarity, but are never meant to be called
+directly, and are not really meant for overriding either.
+
=head2 get_super_paths
-Returns a list of 'parent' or 'super' class names that the current class inherited from.
+Returns a list of 'parent' or 'super' class names that the current class
+inherited from. This is what drives the traversal done by L</get_inherited>.
=cut
sub get_super_paths {
- my $class = Scalar::Util::blessed $_[0] || $_[0];
-
- return @{mro::get_linear_isa($class)};
+ # get_linear_isa returns the class itself as the 1st element
+ # use @_ as a pre-allocated scratch array
+ (undef, @_) = @{mro::get_linear_isa( length( ref($_[0]) ) ? ref($_[0]) : $_[0] )};
+ @_;
};
-1;
+=head2 make_group_accessor
+
+ __PACKAGE__->make_group_accessor('simple', 'hair_length', 'hair_length');
+ __PACKAGE__->make_group_accessor('simple', 'hc', 'hair_color');
+
+=over 4
+
+=item Arguments: $group, $field, $accessor
+
+Returns: \&accessor_coderef ?
+
+=back
+
+Called by mk_group_accessors for each entry in @fieldspec. Either returns
+a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns
+C<undef> if it elects to install the coderef on its own.
+
+=cut
+
+sub make_group_accessor { $gen_accessor->('rw', @_) }
+
+=head2 make_group_ro_accessor
+
+ __PACKAGE__->make_group_ro_accessor('simple', 'birthdate', 'birthdate');
+ __PACKAGE__->make_group_ro_accessor('simple', 'ssn', 'social_security_number');
+
+=over 4
+
+=item Arguments: $group, $field, $accessor
+
+Returns: \&accessor_coderef ?
+
+=back
+
+Called by mk_group_ro_accessors for each entry in @fieldspec. Either returns
+a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns
+C<undef> if it elects to install the coderef on its own.
+
+=cut
+
+sub make_group_ro_accessor { $gen_accessor->('ro', @_) }
+
+=head2 make_group_wo_accessor
+
+ __PACKAGE__->make_group_wo_accessor('simple', 'lie', 'lie');
+ __PACKAGE__->make_group_wo_accessor('simple', 'subj', 'subject');
+
+=over 4
+
+=item Arguments: $group, $field, $accessor
+
+Returns: \&accessor_coderef ?
+
+=back
+
+Called by mk_group_wo_accessors for each entry in @fieldspec. Either returns
+a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns
+C<undef> if it elects to install the coderef on its own.
+
+=cut
+
+sub make_group_wo_accessor { $gen_accessor->('wo', @_) }
+
+
+=head1 PERFORMANCE
+
+To provide total flexibility L<Class::Accessor::Grouped> calls methods
+internally while performing get/set actions, which makes it noticeably
+slower than similar modules. To compensate, this module will automatically
+use the insanely fast L<Class::XSAccessor> to generate the C<simple>-group
+accessors if this module is available on your system.
+
+=head2 Benchmark
+
+This is the result of a set/get/set loop benchmark on perl 5.12.1 with
+thread support, showcasing most popular accessor builders: L<Moose>, L<Mouse>,
+L<Moo>, L<CAF|Class::Accessor::Fast>, L<CAF_XS|Class::Accessor::Fast::XS>,
+L<XSA|Class::XSAccessor>, and L<CAF_XSA|Class::XSAccessor::Compat>:
+
+ Rate CAG moOse CAF moUse moo HANDMADE CAF_XS moUse_XS moo_XS CAF_XSA XSA CAG_XS
+ CAG 169/s -- -21% -24% -32% -32% -34% -59% -63% -67% -67% -67% -67%
+ moOse 215/s 27% -- -3% -13% -13% -15% -48% -53% -58% -58% -58% -58%
+ CAF 222/s 31% 3% -- -10% -10% -13% -46% -52% -57% -57% -57% -57%
+ moUse 248/s 46% 15% 11% -- -0% -3% -40% -46% -52% -52% -52% -52%
+ moo 248/s 46% 15% 11% 0% -- -3% -40% -46% -52% -52% -52% -52%
+ HANDMADE 255/s 50% 18% 14% 3% 3% -- -38% -45% -50% -51% -51% -51%
+ CAF_XS 411/s 143% 91% 85% 66% 66% 61% -- -11% -20% -20% -21% -21%
+ moUse_XS 461/s 172% 114% 107% 86% 86% 81% 12% -- -10% -11% -11% -11%
+ moo_XS 514/s 204% 139% 131% 107% 107% 102% 25% 12% -- -0% -1% -1%
+ CAF_XSA 516/s 205% 140% 132% 108% 108% 103% 26% 12% 0% -- -0% -0%
+ XSA 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% -- -0%
+ CAG_XS 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% 0% --
+
+Benchmark program is available in the root of the
+L<repository|http://search.cpan.org/dist/Class-Accessor-Grouped/>:
+
+=head2 Notes on Class::XSAccessor
+
+You can force (or disable) the use of L<Class::XSAccessor> before creating a
+particular C<simple> accessor by either manipulating the global variable
+C<$Class::Accessor::Grouped::USE_XS> to true or false (preferably with
+L<localization|perlfunc/local>, or you can do so before runtime via the
+C<CAG_USE_XS> environment variable.
+
+Since L<Class::XSAccessor> has no knowledge of L</get_simple> and
+L</set_simple> this module does its best to detect if you are overriding
+one of these methods and will fall back to using the perl version of the
+accessor in order to maintain consistency. However be aware that if you
+enable use of C<Class::XSAccessor> (automatically or explicitly), create
+an object, invoke a simple accessor on that object, and B<then> manipulate
+the symbol table to install a C<get/set_simple> override - you get to keep
+all the pieces.
=head1 AUTHORS
Matt S. Trout <mst@shadowcatsystems.co.uk>
+
Christopher H. Laco <claco@chrislaco.com>
-With contributions from:
+=head1 CONTRIBUTORS
+
+Caelum: Rafael Kitover <rkitover@cpan.org>
+
+frew: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
+
+groditi: Guillermo Roditi <groditi@cpan.org>
+
+Jason Plum <jason.plum@bmmsi.com>
+
+ribasushi: Peter Rabbitson <ribasushi@cpan.org>
-Guillermo Roditi <groditi@cpan.org>
=head1 COPYRIGHT & LICENSE
-Copyright (c) 2006-2009 Matt S. Trout <mst@shadowcatsystems.co.uk>
+Copyright (c) 2006-2010 Matt S. Trout <mst@shadowcatsystems.co.uk>
This program is free software; you can redistribute it and/or modify
it under the same terms as perl itself.
=cut
+
+########################################################################
+########################################################################
+########################################################################
+#
+# Here be many angry dragons
+# (all code is in private coderefs since everything inherits CAG)
+#
+########################################################################
+########################################################################
+
+# Autodetect unless flag supplied
+my $xsa_autodetected;
+if (! defined $USE_XS) {
+ $USE_XS = __CAG_ENV__::NO_CXSA ? 0 : 1;
+ $xsa_autodetected++;
+}
+
+my $perlstring;
+if ($] < '5.008') {
+ require Data::Dumper;
+ my $d = Data::Dumper->new([])->Indent(0)->Purity(0)->Pad('')->Useqq(1)->Terse(1)->Freezer('')->Toaster('');
+ $perlstring = sub { $d->Values([shift])->Dump };
+}
+else {
+ require B;
+ $perlstring = \&B::perlstring;
+}
+
+
+my $maker_templates = {
+ rw => {
+ cxsa_call => 'accessors',
+ pp_generator => sub {
+ # my ($group, $fieldname) = @_;
+ my $quoted_fieldname = $perlstring->($_[1]);
+ sprintf <<'EOS', ($_[0], $quoted_fieldname) x 2;
+
+@_ > 1
+ ? shift->set_%s(%s, @_)
+ : shift->get_%s(%s)
+EOS
+
+ },
+ },
+ ro => {
+ cxsa_call => 'getters',
+ pp_generator => sub {
+ # my ($group, $fieldname) = @_;
+ my $quoted_fieldname = $perlstring->($_[1]);
+ sprintf <<'EOS', $_[0], $quoted_fieldname;
+
+@_ > 1
+ ? do {
+ my ($meth) = (caller(0))[3] =~ /([^\:]+)$/;
+ my $class = length( ref($_[0]) ) ? ref($_[0]) : $_[0];
+ Carp::croak(
+ "'$meth' cannot alter its value (read-only attribute of class $class)"
+ );
+ }
+ : shift->get_%s(%s)
+EOS
+
+ },
+ },
+ wo => {
+ cxsa_call => 'setters',
+ pp_generator => sub {
+ # my ($group, $fieldname) = @_;
+ my $quoted_fieldname = $perlstring->($_[1]);
+ sprintf <<'EOS', $_[0], $quoted_fieldname;
+
+@_ > 1
+ ? shift->set_%s(%s, @_)
+ : do {
+ my ($meth) = (caller(0))[3] =~ /([^\:]+)$/;
+ my $class = length( ref($_[0]) ) ? ref($_[0]) : $_[0];
+ Carp::croak(
+ "'$meth' cannot access its value (write-only attribute of class $class)"
+ );
+ }
+EOS
+
+ },
+ },
+};
+
+my $cag_eval = sub {
+ #my ($src, $no_warnings, $err_msg) = @_;
+
+ my $src = sprintf "{ %s warnings; use strict; no strict 'refs'; %s }",
+ $_[1] ? 'no' : 'use',
+ $_[0],
+ ;
+
+ my (@rv, $err);
+ {
+ local $@ if __CAG_ENV__::UNSTABLE_DOLLARAT;
+ wantarray
+ ? @rv = eval $src
+ : $rv[0] = eval $src
+ ;
+ $err = $@ if $@ ne '';
+ }
+
+ Carp::croak(join ': ', ($_[2] || 'String-eval failed'), "$err\n$src\n" )
+ if defined $err;
+
+ wantarray ? @rv : $rv[0];
+};
+
+my ($accessor_maker_cache, $no_xsa_warned_classes);
+
+# can't use pkg_gen to track this stuff, as it doesn't
+# detect superclass mucking
+my $original_simple_getter = __PACKAGE__->can ('get_simple');
+my $original_simple_setter = __PACKAGE__->can ('set_simple');
+
+# Note!!! Unusual signature
+$gen_accessor = sub {
+ my ($type, $class, $group, $field, $methname) = @_;
+ $class = ref $class if length ref $class;
+
+ # When installing an XSA simple accessor, we need to make sure we are not
+ # short-circuiting a (compile or runtime) get_simple/set_simple override.
+ # What we do here is install a lazy first-access check, which will decide
+ # the ultimate coderef being placed in the accessor slot
+ #
+ # Also note that the *original* class will always retain this shim, as
+ # different branches inheriting from it may have different overrides.
+ # Thus the final method (properly labeled and all) is installed in the
+ # calling-package's namespace
+ if ($USE_XS and $group eq 'simple') {
+ die sprintf( "Class::XSAccessor requested but not available:\n%s\n", __CAG_ENV__::NO_CXSA )
+ if __CAG_ENV__::NO_CXSA;
+
+ my ($expected_cref, $cached_implementation);
+ my $ret = $expected_cref = sub {
+ my $current_class = length (ref ($_[0] ) ) ? ref ($_[0]) : $_[0];
+
+ # $cached_implementation will be set only if the shim got
+ # 'around'ed, in which case it is handy to avoid re-running
+ # this block over and over again
+ my $resolved_implementation = $cached_implementation->{$current_class} || do {
+ if (
+ ($current_class->can('get_simple')||0) == $original_simple_getter
+ &&
+ ($current_class->can('set_simple')||0) == $original_simple_setter
+ ) {
+ # nothing has changed, might as well use the XS crefs
+ #
+ # note that by the time this code executes, we already have
+ # *objects* (since XSA works on 'simple' only by definition).
+ # If someone is mucking with the symbol table *after* there
+ # are some objects already - look! many, shiny pieces! :)
+ #
+ # The weird breeder thingy is because XSA does not have an
+ # interface returning *just* a coderef, without installing it
+ # anywhere :(
+ Class::XSAccessor->import(
+ replace => 1,
+ class => '__CAG__XSA__BREEDER__',
+ $maker_templates->{$type}{cxsa_call} => {
+ $methname => $field,
+ },
+ );
+ __CAG__XSA__BREEDER__->can($methname);
+ }
+ else {
+ if (! $xsa_autodetected and ! $no_xsa_warned_classes->{$current_class}++) {
+ # not using Carp since the line where this happens doesn't mean much
+ warn 'Explicitly requested use of Class::XSAccessor disabled for objects of class '
+ . "'$current_class' inheriting from '$class' due to an overriden get_simple and/or "
+ . "set_simple\n";
+ }
+
+ do {
+ # that's faster than local
+ $USE_XS = 0;
+ my $c = $gen_accessor->($type, $class, 'simple', $field, $methname);
+ $USE_XS = 1;
+ $c;
+ };
+ }
+ };
+
+ # if after this shim was created someone wrapped it with an 'around',
+ # we can not blindly reinstall the method slot - we will destroy the
+ # wrapper. Silently chain execution further...
+ if ( !$expected_cref or $expected_cref != ($current_class->can($methname)||0) ) {
+
+ # there is no point in re-determining it on every subsequent call,
+ # just store for future reference
+ $cached_implementation->{$current_class} ||= $resolved_implementation;
+
+ # older perls segfault if the cref behind the goto throws
+ # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878
+ return $resolved_implementation->(@_) if __CAG_ENV__::BROKEN_GOTO;
+
+ goto $resolved_implementation;
+ }
+
+ if (__CAG_ENV__::TRACK_UNDEFER_FAIL) {
+ my $deferred_calls_seen = do {
+ no strict 'refs';
+ \%{"${current_class}::__cag_deferred_xs_shim_invocations"}
+ };
+ my @cframe = caller(0);
+ if (my $already_seen = $deferred_calls_seen->{$cframe[3]}) {
+ Carp::carp (
+ "Deferred version of method $cframe[3] invoked more than once (originally "
+ . "invoked at $already_seen). This is a strong indication your code has "
+ . 'cached the original ->can derived method coderef, and is using it instead '
+ . 'of the proper method re-lookup, causing minor performance regressions'
+ );
+ }
+ else {
+ $deferred_calls_seen->{$cframe[3]} = "$cframe[1] line $cframe[2]";
+ }
+ }
+
+ # install the resolved implementation into the code slot so we do not
+ # come here anymore (hopefully)
+ # since XSAccessor was available - so is Sub::Name
+ {
+ no strict 'refs';
+ no warnings 'redefine';
+
+ my $fq_name = "${current_class}::${methname}";
+ *$fq_name = Sub::Name::subname($fq_name, $resolved_implementation);
+
+ # need to update what the shim expects too *in case* its
+ # ->can was cached for some moronic reason
+ $expected_cref = $resolved_implementation;
+ Scalar::Util::weaken($expected_cref);
+ }
+
+ # older perls segfault if the cref behind the goto throws
+ # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878
+ return $resolved_implementation->(@_) if __CAG_ENV__::BROKEN_GOTO;
+
+ goto $resolved_implementation;
+ };
+
+ Scalar::Util::weaken($expected_cref); # to break the self-reference
+ $ret;
+ }
+
+ # no Sub::Name - just install the coderefs directly (compiling every time)
+ elsif (__CAG_ENV__::NO_SUBNAME) {
+ my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||=
+ $maker_templates->{$type}{pp_generator}->($group, $field);
+
+ $cag_eval->(
+ "no warnings 'redefine'; sub ${class}::${methname} { $src }; 1",
+ );
+
+ undef; # so that no further attempt will be made to install anything
+ }
+
+ # a coderef generator with a variable pad (returns a fresh cref on every invocation)
+ else {
+ ($accessor_maker_cache->{pp}{$type}{$group}{$field} ||= do {
+ my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||=
+ $maker_templates->{$type}{pp_generator}->($group, $field);
+
+ $cag_eval->( "sub { my \$dummy; sub { \$dummy if 0; $src } }" );
+ })->()
+ }
+};
+
+1;
projects / p5sagit/Class-Accessor-Grouped.git / blobdiff