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RoleToClassApplier.nqp
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RoleToClassApplier.nqp
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my class RoleToClassApplier {
has $!target;
has $!to_compose;
has $!to_compose_meta;
has @!roles;
sub has_method($target, $name, $local) {
if $local {
my %mt := nqp::hllize($target.HOW.method_table($target));
return 1 if nqp::existskey(%mt, $name);
%mt := nqp::hllize($target.HOW.submethod_table($target));
return nqp::existskey(%mt, $name);
}
else {
for $target.HOW.mro($target) {
my %mt := nqp::hllize($_.HOW.method_table($_));
if nqp::existskey(%mt, $name) {
return 1;
}
%mt := nqp::hllize($_.HOW.submethod_table($_));
if nqp::existskey(%mt, $name) {
return 1;
}
}
return 0;
}
}
sub has_private_method($target, $name) {
my %pmt := nqp::hllize($target.HOW.private_method_table($target));
return nqp::existskey(%pmt, $name)
}
method prepare($target, @roles) {
$!target := $target;
@!roles := @roles;
# If we have many things to compose, then get them into a single helper
# role first.
if +@roles == 1 {
$!to_compose := @roles[0];
$!to_compose_meta := $!to_compose.HOW;
}
else {
$!to_compose := $concrete.new_type();
$!to_compose_meta := $!to_compose.HOW;
$!to_compose_meta.set_language_revision($!to_compose, $target.HOW.language-revision($target));
for @roles {
$!to_compose_meta.add_role($!to_compose, $_);
}
$!to_compose := $!to_compose_meta.compose($!to_compose);
}
# Collisions?
my @collisions := $!to_compose_meta.collisions($!to_compose);
for @collisions {
if $_.private {
unless has_private_method($target, $_.name) {
nqp::die("Private method '" ~ $_.name ~
"' must be resolved by class " ~
$target.HOW.name($target) ~
" because it exists in multiple roles (" ~
nqp::join(", ", $_.roles) ~ ")");
}
}
elsif nqp::isconcrete($_.multi) {
my $match := 0;
for $target.HOW.multi_methods_to_incorporate($target) -> $maybe {
if $_.name eq $maybe.name &&
Perl6::Metamodel::Configuration.compare_multi_sigs($_.multi, $maybe.code) {
$match := 1;
last;
}
}
unless $match {
nqp::die("Multi method '" ~ $_.name ~ "' with signature " ~
$_.multi.signature.perl ~ " must be resolved by class " ~
$target.HOW.name($target) ~
" because it exists in multiple roles (" ~
nqp::join(", ", $_.roles) ~ ")");
}
}
else {
unless has_method($target, $_.name, 1) {
nqp::die("Method '" ~ $_.name ~
"' must be resolved by class " ~
$target.HOW.name($target) ~
" because it exists in multiple roles (" ~
nqp::join(", ", $_.roles) ~ ")");
}
}
}
}
method apply() {
my @stubs;
# Starting with v6.e submethods must not be composed in from roles.
my $with_submethods := $!target.HOW.lang-rev-before($!target, 'e');
# Compose in any methods.
sub compose_method_table(@methods, @method_names) {
my $method_iterator := nqp::iterator(@methods);
for @method_names -> str $name {
my $method := nqp::shift($method_iterator);
my $yada := 0;
try { $yada := $method.yada }
if $yada {
unless has_method($!target, $name, 0)
|| $!target.HOW.has_public_attribute($!target, $name) {
my @needed;
for @!roles {
for nqp::hllize($_.HOW.method_table($_)) -> $m {
if $m.key eq $name {
nqp::push(@needed, $_.HOW.name($_));
}
}
}
nqp::push(@stubs, nqp::hash('name', $name, 'needed', @needed, 'target', $!target));
}
}
elsif !has_method($!target, $name, 1)
&& ($with_submethods
|| !nqp::istype($method, Perl6::Metamodel::Configuration.submethod_type))
{
$!target.HOW.add_method($!target, $name, $method);
}
}
}
my @methods := $!to_compose_meta.method_order($!to_compose);
my @method_names := $!to_compose_meta.method_names($!to_compose);
compose_method_table(
nqp::hllize(@methods),
nqp::hllize(@method_names),
);
if nqp::can($!to_compose_meta, 'private_method_table') {
my @private_methods := nqp::hllize($!to_compose_meta.private_methods($!to_compose));
my @private_method_names := nqp::hllize($!to_compose_meta.private_method_names($!to_compose));
my $i := 0;
for @private_method_names -> str $name {
unless has_private_method($!target, $name) {
$!target.HOW.add_private_method($!target, $name, @private_methods[$i]);
}
$i++;
}
}
# Compose in any multi-methods, looking for any requirements and
# ensuring they are met.
if nqp::can($!to_compose_meta, 'multi_methods_to_incorporate') {
my @multis := $!to_compose_meta.multi_methods_to_incorporate($!to_compose);
my @required;
for @multis -> $add {
my $yada := 0;
try { $yada := $add.code.yada }
if $yada {
nqp::push(@required, $add);
}
else {
my $already := 0;
for $!target.HOW.multi_methods_to_incorporate($!target) -> $existing {
if $existing.name eq $add.name {
if Perl6::Metamodel::Configuration.compare_multi_sigs($existing.code, $add.code) {
$already := 1;
last;
}
}
}
unless $already {
$!target.HOW.add_multi_method($!target, $add.name, $add.code);
}
}
for @required -> $req {
my $satisfaction := 0;
for $!target.HOW.multi_methods_to_incorporate($!target) -> $existing {
if $existing.name eq $req.name {
if Perl6::Metamodel::Configuration.compare_multi_sigs($existing.code, $req.code) {
$satisfaction := 1;
last;
}
}
}
unless $satisfaction {
my $name := $req.name;
my $sig := $req.code.signature.perl;
nqp::die("Multi method '$name' with signature $sig must be implemented by " ~
$!target.HOW.name($!target) ~
" because it is required by a role");
}
}
}
}
# Compose in any role attributes.
my @attributes := $!to_compose_meta.attributes($!to_compose, :local(1));
for @attributes {
if $!target.HOW.has_attribute($!target, $_.name) {
nqp::die("Attribute '" ~ $_.name ~ "' already exists in the class '" ~
$!target.HOW.name($!target) ~ "', but a role also wishes to compose it");
}
$!target.HOW.add_attribute($!target, $_);
}
# Compose in any parents.
if nqp::can($!to_compose_meta, 'parents') {
my @parents := $!to_compose_meta.parents($!to_compose, :local(1));
for @parents {
$!target.HOW.add_parent($!target, $_, :hides($!to_compose_meta.hides_parent($!to_compose, $_)));
}
}
# Copy any array_type.
if nqp::can($!target.HOW, 'is_array_type') && !$!target.HOW.is_array_type($!target) {
if nqp::can($!to_compose_meta, 'is_array_type') {
if $!to_compose_meta.is_array_type($!to_compose) {
$!target.HOW.set_array_type($!target, $!to_compose_meta.array_type($!to_compose));
}
}
}
@stubs;
}
Perl6::Metamodel::Configuration.set_role_to_class_applier_type(RoleToClassApplier);
}