--- /dev/null
+
+ package Moose::Meta::Method::Constructor;
+
+ use strict;
+ use warnings;
+
+ use Carp 'confess';
+ use Scalar::Util 'blessed', 'weaken', 'looks_like_number';
+
+ our $VERSION = '0.01';
+ our $AUTHORITY = 'cpan:STEVAN';
+
+ use base 'Moose::Meta::Method';
+
+ sub new {
+ my $class = shift;
+ my %options = @_;
+
+ (exists $options{options} && ref $options{options} eq 'HASH')
+ || confess "You must pass a hash of options";
+
+ my $self = bless {
+ # from our superclass
+ '&!body' => undef,
+ # specific to this subclass
+ '%!options' => $options{options},
+ '$!meta_instance' => $options{metaclass}->get_meta_instance,
+ '@!attributes' => [ $options{metaclass}->compute_all_applicable_attributes ],
+ # ...
+ '$!associated_metaclass' => $options{metaclass},
+ } => $class;
+
+ # we don't want this creating
+ # a cycle in the code, if not
+ # needed
-# weaken($self->{'$!meta_instance'});
+ weaken($self->{'$!associated_metaclass'});
+
+ $self->intialize_body;
+
+ return $self;
+ }
+
+ ## accessors
+
+ sub options { (shift)->{'%!options'} }
+ sub meta_instance { (shift)->{'$!meta_instance'} }
+ sub attributes { (shift)->{'@!attributes'} }
+
+ sub associated_metaclass { (shift)->{'$!associated_metaclass'} }
+
+ ## method
+
+ sub intialize_body {
+ my $self = shift;
+ # TODO:
+ # the %options should also include a both
+ # a call 'initializer' and call 'SUPER::'
+ # options, which should cover approx 90%
+ # of the possible use cases (even if it
+ # requires some adaption on the part of
+ # the author, after all, nothing is free)
+ my $source = 'sub {';
+ $source .= "\n" . 'my $class = shift;';
+
+ $source .= "\n" . 'return $class->Moose::Object::new(@_)';
+ $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';';
+
+ $source .= "\n" . 'my %params = (scalar @_ == 1) ? %{$_[0]} : @_;';
+
+ $source .= "\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class');
+
+ $source .= ";\n" . (join ";\n" => map {
+ $self->_generate_slot_initializer($_)
+ } 0 .. (@{$self->attributes} - 1));
+
+ $source .= ";\n" . $self->_generate_BUILDALL();
+
+ $source .= ";\n" . 'return $instance';
+ $source .= ";\n" . '}';
+ warn $source if $self->options->{debug};
+
+ my $code;
+ {
+ # NOTE:
+ # create the nessecary lexicals
+ # to be picked up in the eval
+ my $attrs = $self->attributes;
+
+ $code = eval $source;
+ confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@;
+ }
+ $self->{'&!body'} = $code;
+ }
+
+ sub _generate_BUILDALL {
+ my $self = shift;
+ my @BUILD_calls;
+ foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) {
+ push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD(\%params)';
+ }
+ return join "\n" => @BUILD_calls;
+ }
+
+ sub _generate_slot_initializer {
+ my $self = shift;
+ my $index = shift;
+
+ my $attr = $self->attributes->[$index];
+
+ my @source = ('## ' . $attr->name);
+
+ if ($attr->is_required && !$attr->has_default) {
+ push @source => ('(exists $params{\'' . $attr->init_arg . '\'}) ' .
+ '|| confess "Attribute (' . $attr->name . ') is required";');
+ }
+
+ if ($attr->has_default && !$attr->is_lazy) {
+
+ push @source => 'if (exists $params{\'' . $attr->init_arg . '\'}) {';
+
+ push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};');
+ if ($attr->has_type_constraint) {
+ push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;');
+
+ if ($attr->should_coerce && $attr->type_constraint->has_coercion) {
+ push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val');
+ }
+ push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val');
+ }
+ push @source => $self->_generate_slot_assignment($attr, '$val');
+
+
+ push @source => "} else {";
+
+ my $default = $self->_generate_default_value($attr, $index);
+
+ push @source => ('my $val = ' . $default . ';');
+ push @source => $self->_generate_type_constraint_check(
+ $attr,
+ ('$attrs->[' . $index . ']->type_constraint'),
+ '$val'
+ ) if $attr->has_type_constraint;
+ push @source => $self->_generate_slot_assignment($attr, $default);
+
+ push @source => "}";
+ }
+ else {
+ push @source => '(exists $params{\'' . $attr->init_arg . '\'}) && do {';
+
+ push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};');
+ if ($attr->has_type_constraint) {
+ push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;');
+
+ if ($attr->should_coerce && $attr->type_constraint->has_coercion) {
+ push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val');
+ }
+ push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val');
+ }
+ push @source => $self->_generate_slot_assignment($attr, '$val');
+
+ push @source => "}";
+ }
+
+ return join "\n" => @source;
+ }
+
+ sub _generate_slot_assignment {
+ my ($self, $attr, $value) = @_;
+ my $source = (
+ $self->meta_instance->inline_set_slot_value(
+ '$instance',
+ ("'" . $attr->name . "'"),
+ $value
+ ) . ';'
+ );
+
+ if ($attr->is_weak_ref) {
+ $source .= (
+ "\n" .
+ $self->meta_instance->inline_weaken_slot_value(
+ '$instance',
+ ("'" . $attr->name . "'")
+ ) .
+ ' if ref ' . $value . ';'
+ );
+ }
+
+ return $source;
+ }
+
+ sub _generate_type_coercion {
+ my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_;
+ return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');');
+ }
+
+ sub _generate_type_constraint_check {
+ my ($self, $attr, $type_constraint_name, $value_name) = @_;
+ return (
+ 'defined(' . $type_constraint_name . '->_compiled_type_constraint->(' . $value_name . '))'
+ . "\n\t" . '|| confess "Attribute (' . $attr->name . ') does not pass the type constraint ('
+ . $attr->type_constraint->name . ') with " . (defined() ? "' . $value_name . '" : "undef");'
+ );
+ }
+
+ sub _generate_default_value {
+ my ($self, $attr, $index) = @_;
+ # NOTE:
+ # default values can either be CODE refs
+ # in which case we need to call them. Or
+ # they can be scalars (strings/numbers)
+ # in which case we can just deal with them
+ # in the code we eval.
+ if ($attr->is_default_a_coderef) {
+ return '$attrs->[' . $index . ']->default($instance)';
+ }
+ else {
+ my $default = $attr->default;
+ # make sure to quote strings ...
+ unless (looks_like_number($default)) {
+ $default = "'$default'";
+ }
+
+ return $default;
+ }
+ }
+
+ 1;
+
+ 1;
+
+ __END__
+
+ =pod
+
+ =head1 NAME
+
+ Moose::Meta::Method::Constructor - Method Meta Object for constructors
+
+ =head1 SYNOPSIS
+
+ =head1 DESCRIPTION
+
+ =head1 METHODS
+
+ =over 4
+
+ =item B<new>
+
+ =item B<attributes>
+
+ =item B<meta_instance>
+
+ =item B<options>
+
+ =item B<intialize_body>
+
+ =item B<associated_metaclass>
+
+ =back
+
+ =head1 AUTHORS
+
+ Stevan Little E<lt>stevan@iinteractive.comE<gt>
+
+ =head1 COPYRIGHT AND LICENSE
+
+ Copyright 2006 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
+
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