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[gitmo/Moose.git] / lib / Moose / Meta / Method / Accessor / Native / Writer.pm

package Moose::Meta::Method::Accessor::Native::Writer;

use strict;
use warnings;

use List::MoreUtils qw( any );

use Moose::Role;

with 'Moose::Meta::Method::Accessor::Native';

requires '_potential_value';

sub _generate_method {
    my $self = shift;

    my $inv         = '$self';
    my $slot_access = $self->_get_value($inv);

    return (
        'sub {',
            'my ' . $inv . ' = shift;',
            $self->_inline_curried_arguments,
            $self->_inline_writer_core($inv, $slot_access),
        '}',
    );
}

sub _inline_writer_core {
    my $self = shift;
    my ($inv, $slot_access) = @_;

    my $potential = $self->_potential_value($slot_access);
    my $old       = '@old';

    my @code;
    push @code, (
        $self->_inline_check_argument_count,
        $self->_inline_process_arguments($inv, $slot_access),
        $self->_inline_check_arguments('for writer'),
        $self->_inline_check_lazy($inv, '$type_constraint', '$type_constraint_obj'),
    );

    if ($self->_return_value($slot_access)) {
        # some writers will save the return value in this variable when they
        # generate the potential value.
        push @code, 'my @return;'
    }

    push @code, (
        $self->_inline_coerce_new_values,
        $self->_inline_copy_native_value(\$potential),
        $self->_inline_tc_code($potential, '$type_constraint', '$type_constraint_obj'),
        $self->_inline_get_old_value_for_trigger($inv, $old),
        $self->_inline_capture_return_value($slot_access),
        $self->_inline_set_new_value($inv, $potential, $slot_access),
        $self->_inline_trigger($inv, $slot_access, $old),
        $self->_inline_return_value($slot_access, 'for writer'),
    );

    return @code;
}

sub _inline_process_arguments { return }

sub _inline_check_arguments { return }

sub _inline_coerce_new_values { return }

sub _writer_value_needs_copy {
    my $self = shift;

    return $self->_constraint_must_be_checked;
}

sub _constraint_must_be_checked {
    my $self = shift;

    my $attr = $self->associated_attribute;

    return $attr->has_type_constraint
        && (!$self->_is_root_type( $attr->type_constraint )
         || ( $attr->should_coerce && $attr->type_constraint->has_coercion)
           );
}

sub _is_root_type {
    my $self = shift;
    my ($type) = @_;

    my $name = $type->name;

    return any { $name eq $_ } @{ $self->root_types };
}

sub _inline_copy_native_value {
    my $self = shift;
    my ($potential_ref) = @_;

    return unless $self->_writer_value_needs_copy;

    my $code = 'my $potential = ' . ${$potential_ref} . ';';

    ${$potential_ref} = '$potential';

    return $code;
}

around _inline_tc_code => sub {
    my $orig = shift;
    my $self = shift;
    my ($value, $tc, $tc_obj, $for_lazy) = @_;

    return unless $for_lazy || $self->_constraint_must_be_checked;

    return $self->$orig(@_);
};

sub _inline_check_coercion {
    my $self = shift;
    my ($value, $tc, $tc_obj) = @_;

    my $attr = $self->associated_attribute;
    return unless $attr->should_coerce && $attr->type_constraint->has_coercion;

    # We want to break the aliasing in @_ in case the coercion tries to make a
    # destructive change to an array member.
    return $value . ' = ' . $tc_obj . '->coerce(' . $value . ');';
}

around _inline_check_constraint => sub {
    my $orig = shift;
    my $self = shift;
    my ($value, $tc, $tc_obj, $for_lazy) = @_;

    return unless $for_lazy || $self->_constraint_must_be_checked;

    return $self->$orig(@_);
};

sub _inline_capture_return_value { return }

sub _inline_set_new_value {
    my $self = shift;

    return $self->_inline_store_value(@_)
        if $self->_writer_value_needs_copy
        || !$self->_slot_access_can_be_inlined
        || !$self->_get_is_lvalue;

    return $self->_inline_optimized_set_new_value(@_);
}

sub _get_is_lvalue {
    my $self = shift;

    return $self->associated_attribute->associated_class->instance_metaclass->inline_get_is_lvalue;
}

sub _inline_optimized_set_new_value {
    my $self = shift;

    return $self->_inline_store_value(@_);
}

sub _return_value {
    my $self = shift;
    my ($slot_access) = @_;

    return $slot_access;
}

no Moose::Role;

1;