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package Method::Generate::Constructor;
use strictures 1;
use Sub::Quote;
use base qw(Moo::Object);
use Sub::Defer;
use B 'perlstring';
sub register_attribute_specs {
my ($self, @new_specs) = @_;
my $specs = $self->{attribute_specs}||={};
while (my ($name, $new_spec) = splice @new_specs, 0, 2) {
if ($name =~ s/^\+//) {
die "has '+${name}' given but no ${name} attribute already exists"
unless my $old_spec = $specs->{$name};
foreach my $key (keys %$old_spec) {
$new_spec->{$key} = $old_spec->{$key}
unless exists $new_spec->{$key};
}
}
$new_spec->{index} = scalar keys %$specs
unless defined $new_spec->{index};
$specs->{$name} = $new_spec;
}
$self;
}
sub all_attribute_specs {
$_[0]->{attribute_specs}
}
sub accessor_generator {
$_[0]->{accessor_generator}
}
sub construction_string {
my ($self) = @_;
$self->{construction_string}
or 'bless('
.$self->accessor_generator->default_construction_string
.', $class);'
}
sub install_delayed {
my ($self) = @_;
my $package = $self->{package};
defer_sub "${package}::new" => sub {
unquote_sub $self->generate_method(
$package, 'new', $self->{attribute_specs}, { no_install => 1 }
)
};
$self;
}
sub generate_method {
my ($self, $into, $name, $spec, $quote_opts) = @_;
foreach my $no_init (grep !exists($spec->{$_}{init_arg}), keys %$spec) {
$spec->{$no_init}{init_arg} = $no_init;
}
local $self->{captures} = {};
my $body = ' my $class = shift;'."\n"
.' $class = ref($class) if ref($class);'."\n";
$body .= $self->_handle_subconstructor($into, $name);
my $into_buildargs = $into->can('BUILDARGS');
if ( $into_buildargs && $into_buildargs != \&Moo::Object::BUILDARGS ) {
$body .= $self->_generate_args_via_buildargs;
} else {
$body .= $self->_generate_args;
}
$body .= $self->_check_required($spec);
$body .= ' my $new = '.$self->construction_string.";\n";
$body .= $self->_assign_new($spec);
if ($into->can('BUILD')) {
require Method::Generate::BuildAll;
$body .= Method::Generate::BuildAll->new->buildall_body_for(
$into, '$new', '$args'
);
}
$body .= ' return $new;'."\n";
if ($into->can('DEMOLISH')) {
require Method::Generate::DemolishAll;
Method::Generate::DemolishAll->new->generate_method($into);
}
quote_sub
"${into}::${name}" => $body,
$self->{captures}, $quote_opts||{}
;
}
sub _handle_subconstructor {
my ($self, $into, $name) = @_;
if (my $gen = $self->{subconstructor_handler}) {
' if ($class ne '.perlstring($into).') {'."\n".
$gen.
' }'."\n";
} else {
''
}
}
sub _cap_call {
my ($self, $code, $captures) = @_;
@{$self->{captures}}{keys %$captures} = values %$captures if $captures;
$code;
}
sub _generate_args_via_buildargs {
my ($self) = @_;
q{ my $args = $class->BUILDARGS(@_);}."\n"
.q{ die "BUILDARGS did not return a hashref" unless ref($args) eq 'HASH';}
."\n";
}
# inlined from Moo::Object - update that first.
sub _generate_args {
my ($self) = @_;
return <<'_EOA';
my $args;
if ( scalar @_ == 1 ) {
unless ( defined $_[0] && ref $_[0] eq 'HASH' ) {
die "Single parameters to new() must be a HASH ref"
." data => ". $_[0] ."\n";
}
$args = { %{ $_[0] } };
}
elsif ( @_ % 2 ) {
die "The new() method for $class expects a hash reference or a key/value list."
. " You passed an odd number of arguments\n";
}
else {
$args = {@_};
}
_EOA
}
sub _assign_new {
my ($self, $spec) = @_;
my $ag = $self->accessor_generator;
my %test;
NAME: foreach my $name (sort keys %$spec) {
my $attr_spec = $spec->{$name};
next NAME unless defined($attr_spec->{init_arg})
or $ag->has_eager_default($name, $attr_spec);
$test{$name} = $attr_spec->{init_arg};
}
join '', map {
my $arg_key = perlstring($test{$_});
my $test = "exists \$args->{$arg_key}";
my $source = "\$args->{$arg_key}";
my $attr_spec = $spec->{$_};
$self->_cap_call($ag->generate_populate_set(
'$new', $_, $attr_spec, $source, $test
));
} sort keys %test;
}
sub _check_required {
my ($self, $spec) = @_;
my @required_init =
map $spec->{$_}{init_arg},
grep $spec->{$_}{required},
sort keys %$spec;
return '' unless @required_init;
' if (my @missing = grep !exists $args->{$_}, qw('
.join(' ',@required_init).')) {'."\n"
.q{ die "Missing required arguments: ".join(', ', sort @missing);}."\n"
." }\n";
}
sub _check_isa {
my ($self, $spec) = @_;
my $acc = $self->accessor_generator;
my $captures = $self->{captures};
my $check = '';
foreach my $name (sort keys %$spec) {
my ($init, $isa) = @{$spec->{$name}}{qw(init_arg isa)};
next unless $init and $isa;
my $init_str = perlstring($init);
my ($code, $add_captures) = $acc->generate_isa_check(
$name, "\$args->{${init_str}}", $isa
);
@{$captures}{keys %$add_captures} = values %$add_captures;
$check .= " ${code}".(
(not($spec->{lazy}) and ($spec->{default} or $spec->{builder})
? ";\n"
: "if exists \$args->{${init_str}};\n"
)
);
}
return $check;
}
sub _fire_triggers {
my ($self, $spec) = @_;
my $acc = $self->accessor_generator;
my $captures = $self->{captures};
my $fire = '';
foreach my $name (sort keys %$spec) {
my ($init, $trigger) = @{$spec->{$name}}{qw(init_arg trigger)};
next unless $init && $trigger;
my ($code, $add_captures) = $acc->generate_trigger(
$name, '$new', $acc->generate_simple_get('$new', $name, $spec), $trigger
);
@{$captures}{keys %$add_captures} = values %$add_captures;
$fire .= " ${code} if exists \$args->{${\perlstring $init}};\n";
}
return $fire;
}
1;
|
