package Method::Generate::Accessor;
use strictures 1;
-use Class::Tiny::_Utils;
-use base qw(Class::Tiny::Object);
+use Moo::_Utils;
+use base qw(Moo::Object);
use Sub::Quote;
use B 'perlstring';
+use Scalar::Util 'blessed';
+use overload ();
+BEGIN {
+ our $CAN_HAZ_XS =
+ !$ENV{MOO_XS_DISABLE}
+ &&
+ _maybe_load_module('Class::XSAccessor')
+ &&
+ (eval { Class::XSAccessor->VERSION('1.07') })
+ ;
+}
sub generate_method {
my ($self, $into, $name, $spec, $quote_opts) = @_;
+ $name =~ s/^\+//;
die "Must have an is" unless my $is = $spec->{is};
- local $self->{captures} = {};
- my $body = do {
- if ($is eq 'ro') {
- $self->_generate_get($name)
- } elsif ($is eq 'rw') {
- $self->_generate_getset($name, $spec)
+ if ($is eq 'ro') {
+ $spec->{reader} = $name unless exists $spec->{reader};
+ } elsif ($is eq 'rw') {
+ $spec->{accessor} = $name unless exists $spec->{accessor};
+ } elsif ($is eq 'lazy') {
+ $spec->{reader} = $name unless exists $spec->{reader};
+ $spec->{lazy} = 1;
+ $spec->{builder} ||= '_build_'.$name unless $spec->{default};
+ } elsif ($is eq 'rwp') {
+ $spec->{reader} = $name unless exists $spec->{reader};
+ $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
+ } elsif ($is ne 'bare') {
+ die "Unknown is ${is}";
+ }
+ $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
+ die "Invalid builder for $into->$name - not a valid method name"
+ if exists $spec->{builder} and (ref $spec->{builder}
+ or $spec->{builder} !~ /\A[A-Za-z_][A-Za-z0-9_]*(?:::[A-Za-z_][A-Za-z0-9_]*)*\z/);
+ if (($spec->{predicate}||0) eq 1) {
+ $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
+ }
+ if (($spec->{clearer}||0) eq 1) {
+ $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
+ }
+ if (($spec->{trigger}||0) eq 1) {
+ $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
+ }
+
+ for my $setting (qw( default coerce )) {
+ next if !exists $spec->{$setting};
+ my $value = $spec->{$setting};
+ my $invalid = "Invalid $setting '" . overload::StrVal($value)
+ . "' for $into->$name - not a coderef";
+ die "$invalid or code-convertible object"
+ unless ref $value and (ref $value eq 'CODE' or blessed($value));
+ die "$invalid and could not be converted to a coderef: $@"
+ if !eval { \&$value };
+ }
+
+ my %methods;
+ if (my $reader = $spec->{reader}) {
+ if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
+ $methods{$reader} = $self->_generate_xs(
+ getters => $into, $reader, $name, $spec
+ );
} else {
- die "Unknown is ${is}";
+ $self->{captures} = {};
+ $methods{$reader} =
+ quote_sub "${into}::${reader}"
+ => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
+ .$self->_generate_get($name, $spec)
+ => delete $self->{captures}
+ ;
}
- };
- quote_sub
- "${into}::${name}" => ' '.$body."\n",
- $self->{captures}, $quote_opts||{}
- ;
+ }
+ if (my $accessor = $spec->{accessor}) {
+ if (
+ our $CAN_HAZ_XS
+ && $self->is_simple_get($name, $spec)
+ && $self->is_simple_set($name, $spec)
+ ) {
+ $methods{$accessor} = $self->_generate_xs(
+ accessors => $into, $accessor, $name, $spec
+ );
+ } else {
+ $self->{captures} = {};
+ $methods{$accessor} =
+ quote_sub "${into}::${accessor}"
+ => $self->_generate_getset($name, $spec)
+ => delete $self->{captures}
+ ;
+ }
+ }
+ if (my $writer = $spec->{writer}) {
+ if (
+ our $CAN_HAZ_XS
+ && $self->is_simple_set($name, $spec)
+ ) {
+ $methods{$writer} = $self->_generate_xs(
+ setters => $into, $writer, $name, $spec
+ );
+ } else {
+ $self->{captures} = {};
+ $methods{$writer} =
+ quote_sub "${into}::${writer}"
+ => $self->_generate_set($name, $spec)
+ => delete $self->{captures}
+ ;
+ }
+ }
+ if (my $pred = $spec->{predicate}) {
+ $methods{$pred} =
+ quote_sub "${into}::${pred}" =>
+ ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
+ ;
+ }
+ if (my $cl = $spec->{clearer}) {
+ $methods{$cl} =
+ quote_sub "${into}::${cl}" =>
+ $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
+ ;
+ }
+ if (my $hspec = $spec->{handles}) {
+ my $asserter = $spec->{asserter} ||= '_assert_'.$name;
+ my @specs = do {
+ if (ref($hspec) eq 'ARRAY') {
+ map [ $_ => $_ ], @$hspec;
+ } elsif (ref($hspec) eq 'HASH') {
+ map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
+ keys %$hspec;
+ } elsif (!ref($hspec)) {
+ map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
+ } else {
+ die "You gave me a handles of ${hspec} and I have no idea why";
+ }
+ };
+ foreach my $spec (@specs) {
+ my ($proxy, $target, @args) = @$spec;
+ $self->{captures} = {};
+ $methods{$proxy} =
+ quote_sub "${into}::${proxy}" =>
+ $self->_generate_delegation($asserter, $target, \@args),
+ delete $self->{captures}
+ ;
+ }
+ }
+ if (my $asserter = $spec->{asserter}) {
+ $self->{captures} = {};
+ $methods{$asserter} =
+ quote_sub "${into}::${asserter}" =>
+ 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
+ delete $self->{captures}
+ ;
+ }
+ \%methods;
+}
+
+sub is_simple_attribute {
+ my ($self, $name, $spec) = @_;
+ # clearer doesn't have to be listed because it doesn't
+ # affect whether defined/exists makes a difference
+ !grep $spec->{$_},
+ qw(lazy default builder coerce isa trigger predicate weak_ref);
+}
+
+sub is_simple_get {
+ my ($self, $name, $spec) = @_;
+ !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
+}
+
+sub is_simple_set {
+ my ($self, $name, $spec) = @_;
+ !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
+}
+
+sub has_eager_default {
+ my ($self, $name, $spec) = @_;
+ (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
}
sub _generate_get {
- my ($self, $name) = @_;
- $self->_generate_simple_get('$_[0]', $name);
+ my ($self, $name, $spec) = @_;
+ my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
+ if ($self->is_simple_get($name, $spec)) {
+ $simple;
+ } else {
+ 'do { '.$self->_generate_use_default(
+ '$_[0]', $name, $spec,
+ $self->_generate_simple_has('$_[0]', $name, $spec),
+ ).'; '
+ .($spec->{isa}
+ ?($self->_generate_isa_check($name, $simple, $spec->{isa}).'; ')
+ :''
+ )
+ .$simple.' }';
+ }
+}
+
+sub _generate_simple_has {
+ my ($self, $me, $name) = @_;
+ "exists ${me}->{${\perlstring $name}}";
+}
+
+sub _generate_simple_clear {
+ my ($self, $me, $name) = @_;
+ " delete ${me}->{${\perlstring $name}}\n"
+}
+
+sub generate_get_default {
+ my $self = shift;
+ $self->{captures} = {};
+ my $code = $self->_generate_get_default(@_);
+ ($code, delete $self->{captures});
+}
+
+sub _generate_use_default {
+ my ($self, $me, $name, $spec, $test) = @_;
+ my $get_value = $self->_generate_get_default($me, $name, $spec);
+ if ($spec->{coerce}) {
+ $get_value = $self->_generate_coerce(
+ $name, $get_value,
+ $spec->{coerce}
+ )
+ }
+ $self->_generate_simple_set(
+ $me, $name, $spec, $get_value
+ ).' unless '.$test;
+}
+
+sub _generate_get_default {
+ my ($self, $me, $name, $spec) = @_;
+ $spec->{default}
+ ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
+ : "${me}->${\$spec->{builder}}"
}
sub generate_simple_get {
- shift->_generate_simple_get(@_);
+ my ($self, @args) = @_;
+ $self->_generate_simple_get(@args);
}
sub _generate_simple_get {
}
sub _generate_set {
- my ($self, $name, $value, $spec) = @_;
- my $simple = $self->_generate_simple_set($name, $value);
- my ($trigger, $isa_check) = @{$spec}{qw(trigger isa)};
- return $simple unless $trigger or $isa_check;
- my $code = 'do {';
- if ($isa_check) {
- $code .= ' '.$self->_generate_isa_check($name, '$_[1]', $isa_check).';';
- }
- if ($trigger) {
- my $fire = $self->_generate_trigger($name, '$_[0]', '$value', $trigger);
- $code .=
- ' my $value = '.$simple.'; '.$fire.'; '
- .'$value';
+ my ($self, $name, $spec) = @_;
+ if ($self->is_simple_set($name, $spec)) {
+ $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
} else {
- $code .= ' '.$simple;
+ my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
+ my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
+ my $code = "do { my (\$self, \$value) = \@_;\n";
+ if ($coerce) {
+ $code .=
+ " \$value = "
+ .$self->_generate_coerce($name, '$value', $coerce).";\n";
+ }
+ if ($isa_check) {
+ $code .=
+ " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
+ }
+ if ($trigger) {
+ my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
+ $code .=
+ " ".$simple.";\n ".$fire.";\n"
+ ." \$value;\n";
+ } else {
+ $code .= " ".$simple.";\n";
+ }
+ $code .= " }";
+ $code;
}
- $code .= ' }';
- return $code;
}
+sub generate_coerce {
+ my $self = shift;
+ $self->{captures} = {};
+ my $code = $self->_generate_coerce(@_);
+ ($code, delete $self->{captures});
+}
+
+sub _attr_desc {
+ my ($name, $init_arg) = @_;
+ return perlstring($name) if !defined($init_arg) or $init_arg eq $name;
+ return perlstring($name).' (constructor argument: '.perlstring($init_arg).')';
+}
+
+sub _generate_coerce {
+ my ($self, $name, $value, $coerce, $init_arg) = @_;
+ $self->_generate_die_prefix(
+ "coercion for ${\_attr_desc($name, $init_arg)} failed: ",
+ $self->_generate_call_code($name, 'coerce', "${value}", $coerce)
+ );
+}
+
sub generate_trigger {
my $self = shift;
- local $self->{captures} = {};
+ $self->{captures} = {};
my $code = $self->_generate_trigger(@_);
- return ($code, $self->{captures});
+ ($code, delete $self->{captures});
}
sub _generate_trigger {
}
sub generate_isa_check {
- my $self = shift;
- local $self->{captures} = {};
- my $code = $self->_generate_isa_check(@_);
- return ($code, $self->{captures});
+ my ($self, @args) = @_;
+ $self->{captures} = {};
+ my $code = $self->_generate_isa_check(@args);
+ ($code, delete $self->{captures});
+}
+
+sub _generate_die_prefix {
+ my ($self, $prefix, $inside) = @_;
+ "do {\n"
+ .' my $sig_die = $SIG{__DIE__} || sub { die $_[0] };'."\n"
+ .' local $SIG{__DIE__} = sub {'."\n"
+ .' $sig_die->(ref($_[0]) ? $_[0] : '.perlstring($prefix).'.$_[0]);'."\n"
+ .' };'."\n"
+ .$inside
+ ."}\n"
}
sub _generate_isa_check {
- my ($self, $name, $value, $check) = @_;
- $self->_generate_call_code($name, 'isa_check', $value, $check);
+ my ($self, $name, $value, $check, $init_arg) = @_;
+ $self->_generate_die_prefix(
+ "isa check for ${\_attr_desc($name, $init_arg)} failed: ",
+ $self->_generate_call_code($name, 'isa_check', $value, $check)
+ );
}
sub _generate_call_code {
my ($self, $name, $type, $values, $sub) = @_;
if (my $quoted = quoted_from_sub($sub)) {
my $code = $quoted->[1];
- my $at_ = 'local @_ = ('.$values.');';
if (my $captures = $quoted->[2]) {
my $cap_name = qq{\$${type}_captures_for_${name}};
$self->{captures}->{$cap_name} = \$captures;
- return "do {\n".' '.$at_."\n"
- .Sub::Quote::capture_unroll($cap_name, $captures, 6)
- ." ${code}\n }";
+ Sub::Quote::inlinify(
+ $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6), 1
+ );
+ } else {
+ Sub::Quote::inlinify($code, $values, undef, 1);
+ }
+ } else {
+ my $cap_name = qq{\$${type}_for_${name}};
+ $self->{captures}->{$cap_name} = \$sub;
+ "${cap_name}->(${values})";
+ }
+}
+
+sub generate_populate_set {
+ my $self = shift;
+ $self->{captures} = {};
+ my $code = $self->_generate_populate_set(@_);
+ ($code, delete $self->{captures});
+}
+
+sub _generate_populate_set {
+ my ($self, $me, $name, $spec, $source, $test, $init_arg) = @_;
+ if ($self->has_eager_default($name, $spec)) {
+ my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
+ my $get_default = $self->_generate_get_default(
+ '$new', $_, $spec
+ );
+ my $get_value =
+ defined($spec->{init_arg})
+ ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
+ .$get_default
+ ."\n${get_indent})"
+ : $get_default;
+ if ($spec->{coerce}) {
+ $get_value = $self->_generate_coerce(
+ $name, $get_value,
+ $spec->{coerce}, $init_arg
+ )
}
- return 'do { local @_ = ('.$values.'); '.$code.' }';
+ ($spec->{isa}
+ ? " {\n my \$value = ".$get_value.";\n "
+ .$self->_generate_isa_check(
+ $name, '$value', $spec->{isa}, $init_arg
+ ).";\n"
+ .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
+ ." }\n"
+ : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
+ )
+ .($spec->{trigger}
+ ? ' '
+ .$self->_generate_trigger(
+ $name, $me, $self->_generate_simple_get($me, $name, $spec),
+ $spec->{trigger}
+ )." if ${test};\n"
+ : ''
+ );
+ } else {
+ " if (${test}) {\n"
+ .($spec->{coerce}
+ ? " $source = "
+ .$self->_generate_coerce(
+ $name, $source,
+ $spec->{coerce}, $init_arg
+ ).";\n"
+ : ""
+ )
+ .($spec->{isa}
+ ? " "
+ .$self->_generate_isa_check(
+ $name, $source, $spec->{isa}, $init_arg
+ ).";\n"
+ : ""
+ )
+ ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
+ .($spec->{trigger}
+ ? " "
+ .$self->_generate_trigger(
+ $name, $me, $self->_generate_simple_get($me, $name, $spec),
+ $spec->{trigger}
+ ).";\n"
+ : ""
+ )
+ ." }\n";
}
- my $cap_name = qq{\$${type}_for_${name}};
- $self->{captures}->{$cap_name} = \$sub;
- return "${cap_name}->(${values})";
+}
+
+sub _generate_core_set {
+ my ($self, $me, $name, $spec, $value) = @_;
+ my $name_str = perlstring $name;
+ "${me}->{${name_str}} = ${value}";
}
sub _generate_simple_set {
- my ($self, $name, $value) = @_;
+ my ($self, $me, $name, $spec, $value) = @_;
my $name_str = perlstring $name;
- "\$_[0]->{${name_str}} = ${value}";
+
+ if ($spec->{weak_ref}) {
+ $value = '$preserve = '.$value;
+ my $simple = $self->_generate_core_set($me, $name, $spec, $value);
+ require Scalar::Util;
+
+ # Perl < 5.8.3 can't weaken refs to readonly vars
+ # (e.g. string constants). This *can* be solved by:
+ #
+ #Internals::SetReadWrite($foo);
+ #Scalar::Util::weaken ($foo);
+ #Internals::SetReadOnly($foo);
+ #
+ # but requires XS and is just too damn crazy
+ # so simply throw a better exception
+ my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple}); no warnings 'void'; \$preserve";
+ Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
+
+ my \$preserve;
+ eval { Scalar::Util::weaken($simple); 1 }
+ ? do { no warnings 'void'; \$preserve; }
+ : do {
+ if( \$@ =~ /Modification of a read-only value attempted/) {
+ require Carp;
+ Carp::croak( sprintf (
+ 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
+ $name_str,
+ ) );
+ } else {
+ die \$@;
+ }
+ }
+EOC
+ } else {
+ $self->_generate_core_set($me, $name, $spec, $value);
+ }
}
sub _generate_getset {
my ($self, $name, $spec) = @_;
- q{(@_ > 1 ? }.$self->_generate_set($name, q{$_[1]}, $spec)
- .' : '.$self->_generate_get($name).')';
+ q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
+ ."\n : ".$self->_generate_get($name, $spec)."\n )";
}
+sub _generate_delegation {
+ my ($self, $asserter, $target, $args) = @_;
+ my $arg_string = do {
+ if (@$args) {
+ # I could, I reckon, linearise out non-refs here using perlstring
+ # plus something to check for numbers but I'm unsure if it's worth it
+ $self->{captures}{'@curries'} = $args;
+ '@curries, @_';
+ } else {
+ '@_';
+ }
+ };
+ "shift->${asserter}->${target}(${arg_string});";
+}
+
+sub _generate_xs {
+ my ($self, $type, $into, $name, $slot) = @_;
+ Class::XSAccessor->import(
+ class => $into,
+ $type => { $name => $slot },
+ replace => 1,
+ );
+ $into->can($name);
+}
+
+sub default_construction_string { '{}' }
+
1;
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