1 package Method::Generate::Accessor;
5 use base qw(Moo::Object);
8 use Scalar::Util 'blessed';
10 use Module::Runtime qw(use_module);
15 _maybe_load_module('Class::XSAccessor')
17 (eval { Class::XSAccessor->VERSION('1.07') })
23 our ($CurrentAttribute, $OrigSigDie);
24 my $sigdie = $OrigSigDie && $OrigSigDie != \&_SIGDIE
28 return $sigdie->(@_) if ref($_[0]);
30 my $attr_desc = _attr_desc(@$CurrentAttribute{qw(name init_arg)});
31 $sigdie->("$CurrentAttribute->{step} for $attr_desc failed: $_[0]");
36 my ($pkg, $method, $type) = @_;
37 die "You cannot overwrite a locally defined method ($method) with @{[ $type || 'an accessor' ]}";
41 my ($self, $into, $name, $spec, $quote_opts) = @_;
42 $spec->{allow_overwrite}++ if $name =~ s/^\+//;
43 die "Must have an is" unless my $is = $spec->{is};
45 $spec->{reader} = $name unless exists $spec->{reader};
46 } elsif ($is eq 'rw') {
47 $spec->{accessor} = $name unless exists $spec->{accessor}
48 or ( $spec->{reader} and $spec->{writer} );
49 } elsif ($is eq 'lazy') {
50 $spec->{reader} = $name unless exists $spec->{reader};
52 $spec->{builder} ||= '_build_'.$name unless $spec->{default};
53 } elsif ($is eq 'rwp') {
54 $spec->{reader} = $name unless exists $spec->{reader};
55 $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
56 } elsif ($is ne 'bare') {
57 die "Unknown is ${is}";
59 if (exists $spec->{builder}) {
60 if(ref $spec->{builder}) {
61 $self->_validate_codulatable('builder', $spec->{builder},
62 "$into->$name", 'or a method name');
63 $spec->{builder_sub} = $spec->{builder};
66 $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
67 die "Invalid builder for $into->$name - not a valid method name"
68 if $spec->{builder} !~ /\A[A-Za-z_][A-Za-z0-9_]*(?:::[A-Za-z_][A-Za-z0-9_]*)*\z/;
70 if (($spec->{predicate}||0) eq 1) {
71 $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
73 if (($spec->{clearer}||0) eq 1) {
74 $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
76 if (($spec->{trigger}||0) eq 1) {
77 $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
80 for my $setting (qw( isa coerce )) {
81 next if !exists $spec->{$setting};
82 $self->_validate_codulatable($setting, $spec->{$setting}, "$into->$name");
85 if (exists $spec->{default}) {
86 if (!defined $spec->{default} || ref $spec->{default}) {
87 $self->_validate_codulatable('default', $spec->{default}, "$into->$name", 'or a non-ref');
91 if (exists $spec->{moosify}) {
92 if (ref $spec->{moosify} ne 'ARRAY') {
93 $spec->{moosify} = [$spec->{moosify}];
96 for my $spec (@{$spec->{moosify}}) {
97 $self->_validate_codulatable('moosify', $spec, "$into->$name");
102 if (my $reader = $spec->{reader}) {
103 _die_overwrite($into, $reader, 'a reader')
104 if !$spec->{allow_overwrite} && *{_getglob("${into}::${reader}")}{CODE};
105 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
106 $methods{$reader} = $self->_generate_xs(
107 getters => $into, $reader, $name, $spec
110 $self->{captures} = {};
112 quote_sub "${into}::${reader}"
113 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
114 .$self->_generate_get($name, $spec)
115 => delete $self->{captures}
119 if (my $accessor = $spec->{accessor}) {
120 _die_overwrite($into, $accessor, 'an accessor')
121 if !$spec->{allow_overwrite} && *{_getglob("${into}::${accessor}")}{CODE};
124 && $self->is_simple_get($name, $spec)
125 && $self->is_simple_set($name, $spec)
127 $methods{$accessor} = $self->_generate_xs(
128 accessors => $into, $accessor, $name, $spec
131 $self->{captures} = {};
132 $methods{$accessor} =
133 quote_sub "${into}::${accessor}"
134 => $self->_generate_getset($name, $spec)
135 => delete $self->{captures}
139 if (my $writer = $spec->{writer}) {
140 _die_overwrite($into, $writer, 'a writer')
141 if !$spec->{allow_overwrite} && *{_getglob("${into}::${writer}")}{CODE};
144 && $self->is_simple_set($name, $spec)
146 $methods{$writer} = $self->_generate_xs(
147 setters => $into, $writer, $name, $spec
150 $self->{captures} = {};
152 quote_sub "${into}::${writer}"
153 => $self->_generate_set($name, $spec)
154 => delete $self->{captures}
158 if (my $pred = $spec->{predicate}) {
159 _die_overwrite($into, $pred, 'a predicate')
160 if !$spec->{allow_overwrite} && *{_getglob("${into}::${pred}")}{CODE};
162 quote_sub "${into}::${pred}" =>
163 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
166 if (my $pred = $spec->{builder_sub}) {
167 _install_coderef( "${into}::$spec->{builder}" => $spec->{builder_sub} );
169 if (my $cl = $spec->{clearer}) {
170 _die_overwrite($into, $cl, 'a clearer')
171 if !$spec->{allow_overwrite} && *{_getglob("${into}::${cl}")}{CODE};
173 quote_sub "${into}::${cl}" =>
174 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
177 if (my $hspec = $spec->{handles}) {
178 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
180 if (ref($hspec) eq 'ARRAY') {
181 map [ $_ => $_ ], @$hspec;
182 } elsif (ref($hspec) eq 'HASH') {
183 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
185 } elsif (!ref($hspec)) {
186 map [ $_ => $_ ], use_module('Role::Tiny')->methods_provided_by(use_module($hspec))
188 die "You gave me a handles of ${hspec} and I have no idea why";
191 foreach my $delegation_spec (@specs) {
192 my ($proxy, $target, @args) = @$delegation_spec;
193 _die_overwrite($into, $proxy, 'a delegation')
194 if !$spec->{allow_overwrite} && *{_getglob("${into}::${proxy}")}{CODE};
195 $self->{captures} = {};
197 quote_sub "${into}::${proxy}" =>
198 $self->_generate_delegation($asserter, $target, \@args),
199 delete $self->{captures}
203 if (my $asserter = $spec->{asserter}) {
204 $self->{captures} = {};
207 $methods{$asserter} =
208 quote_sub "${into}::${asserter}" => $self->_generate_asserter($name, $spec),
209 delete $self->{captures}
215 sub is_simple_attribute {
216 my ($self, $name, $spec) = @_;
217 # clearer doesn't have to be listed because it doesn't
218 # affect whether defined/exists makes a difference
220 qw(lazy default builder coerce isa trigger predicate weak_ref);
224 my ($self, $name, $spec) = @_;
225 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
229 my ($self, $name, $spec) = @_;
230 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
233 sub has_eager_default {
234 my ($self, $name, $spec) = @_;
235 (!$spec->{lazy} and (exists $spec->{default} or $spec->{builder}));
239 my ($self, $name, $spec) = @_;
240 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
241 if ($self->is_simple_get($name, $spec)) {
244 $self->_generate_use_default(
245 '$_[0]', $name, $spec,
246 $self->_generate_simple_has('$_[0]', $name, $spec),
251 sub generate_simple_has {
253 $self->{captures} = {};
254 my $code = $self->_generate_simple_has(@_);
255 ($code, delete $self->{captures});
258 sub _generate_simple_has {
259 my ($self, $me, $name) = @_;
260 "exists ${me}->{${\perlstring $name}}";
263 sub _generate_simple_clear {
264 my ($self, $me, $name) = @_;
265 " delete ${me}->{${\perlstring $name}}\n"
268 sub generate_get_default {
270 $self->{captures} = {};
271 my $code = $self->_generate_get_default(@_);
272 ($code, delete $self->{captures});
275 sub generate_use_default {
277 $self->{captures} = {};
278 my $code = $self->_generate_use_default(@_);
279 ($code, delete $self->{captures});
282 sub _generate_use_default {
283 my ($self, $me, $name, $spec, $test) = @_;
284 my $get_value = $self->_generate_get_default($me, $name, $spec);
285 if ($spec->{coerce}) {
286 $get_value = $self->_generate_coerce(
292 .$self->_generate_simple_get($me, $name, $spec)."\n:"
294 ? " do {\n my \$value = ".$get_value.";\n"
295 ." ".$self->_generate_isa_check($name, '$value', $spec->{isa}).";\n"
296 ." ".$self->_generate_simple_set($me, $name, $spec, '$value')."\n"
298 : ' ('.$self->_generate_simple_set($me, $name, $spec, $get_value).")\n");
301 sub _generate_get_default {
302 my ($self, $me, $name, $spec) = @_;
303 if (exists $spec->{default}) {
305 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
306 : perlstring $spec->{default};
309 "${me}->${\$spec->{builder}}"
313 sub generate_simple_get {
314 my ($self, @args) = @_;
315 $self->_generate_simple_get(@args);
318 sub _generate_simple_get {
319 my ($self, $me, $name) = @_;
320 my $name_str = perlstring $name;
321 "${me}->{${name_str}}";
325 my ($self, $name, $spec) = @_;
326 if ($self->is_simple_set($name, $spec)) {
327 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
329 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
330 my $value_store = '$_[0]';
333 $value_store = '$value';
334 $code = "do { my (\$self, \$value) = \@_;\n"
336 .$self->_generate_coerce($name, $value_store, $coerce).";\n";
339 $code = "do { my \$self = shift;\n";
343 " ".$self->_generate_isa_check($name, $value_store, $isa_check).";\n";
345 my $simple = $self->_generate_simple_set('$self', $name, $spec, $value_store);
347 my $fire = $self->_generate_trigger($name, '$self', $value_store, $trigger);
349 " ".$simple.";\n ".$fire.";\n"
352 $code .= " ".$simple.";\n";
359 sub generate_coerce {
361 $self->{captures} = {};
362 my $code = $self->_generate_coerce(@_);
363 ($code, delete $self->{captures});
367 my ($name, $init_arg) = @_;
368 return perlstring($name) if !defined($init_arg) or $init_arg eq $name;
369 return perlstring($name).' (constructor argument: '.perlstring($init_arg).')';
372 sub _generate_coerce {
373 my ($self, $name, $value, $coerce, $init_arg) = @_;
374 $self->_generate_die_prefix(
378 $self->_generate_call_code($name, 'coerce', "${value}", $coerce)
382 sub generate_trigger {
384 $self->{captures} = {};
385 my $code = $self->_generate_trigger(@_);
386 ($code, delete $self->{captures});
389 sub _generate_trigger {
390 my ($self, $name, $obj, $value, $trigger) = @_;
391 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
394 sub generate_isa_check {
395 my ($self, @args) = @_;
396 $self->{captures} = {};
397 my $code = $self->_generate_isa_check(@args);
398 ($code, delete $self->{captures});
401 sub _generate_die_prefix {
402 my ($self, $name, $prefix, $arg, $inside) = @_;
404 .' local $Method::Generate::Accessor::CurrentAttribute = {'
405 .' init_arg => '.(defined $arg ? B::perlstring($arg) : 'undef') . ",\n"
406 .' name => '.B::perlstring($name).",\n"
407 .' step => '.B::perlstring($prefix).",\n"
409 .' local $Method::Generate::Accessor::OrigSigDie = $SIG{__DIE__};'."\n"
410 .' local $SIG{__DIE__} = \&Method::Generate::Accessor::_SIGDIE;'."\n"
415 sub _generate_isa_check {
416 my ($self, $name, $value, $check, $init_arg) = @_;
417 $self->_generate_die_prefix(
421 $self->_generate_call_code($name, 'isa_check', $value, $check)
425 sub _generate_call_code {
426 my ($self, $name, $type, $values, $sub) = @_;
427 $sub = \&{$sub} if blessed($sub); # coderef if blessed
428 if (my $quoted = quoted_from_sub($sub)) {
430 if ($values eq '@_' || $values eq '$_[0]') {
434 my $code = $quoted->[1];
435 if (my $captures = $quoted->[2]) {
436 my $cap_name = qq{\$${type}_captures_for_${name}};
437 $self->{captures}->{$cap_name} = \$captures;
438 Sub::Quote::inlinify(
439 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6), $local
442 Sub::Quote::inlinify($code, $values, undef, $local);
445 my $cap_name = qq{\$${type}_for_${name}};
446 $self->{captures}->{$cap_name} = \$sub;
447 "${cap_name}->(${values})";
451 sub generate_populate_set {
453 $self->{captures} = {};
454 my $code = $self->_generate_populate_set(@_);
455 ($code, delete $self->{captures});
458 sub _generate_populate_set {
459 my ($self, $me, $name, $spec, $source, $test, $init_arg) = @_;
460 if ($self->has_eager_default($name, $spec)) {
461 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
462 my $get_default = $self->_generate_get_default(
466 defined($spec->{init_arg})
467 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
471 if ($spec->{coerce}) {
472 $get_value = $self->_generate_coerce(
474 $spec->{coerce}, $init_arg
478 ? " {\n my \$value = ".$get_value.";\n "
479 .$self->_generate_isa_check(
480 $name, '$value', $spec->{isa}, $init_arg
482 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
484 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
488 .$self->_generate_trigger(
489 $name, $me, $self->_generate_simple_get($me, $name, $spec),
498 .$self->_generate_coerce(
500 $spec->{coerce}, $init_arg
506 .$self->_generate_isa_check(
507 $name, $source, $spec->{isa}, $init_arg
511 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
514 .$self->_generate_trigger(
515 $name, $me, $self->_generate_simple_get($me, $name, $spec),
524 sub _generate_core_set {
525 my ($self, $me, $name, $spec, $value) = @_;
526 my $name_str = perlstring $name;
527 "${me}->{${name_str}} = ${value}";
530 sub _generate_simple_set {
531 my ($self, $me, $name, $spec, $value) = @_;
532 my $name_str = perlstring $name;
533 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
535 if ($spec->{weak_ref}) {
536 require Scalar::Util;
537 my $get = $self->_generate_simple_get($me, $name, $spec);
539 # Perl < 5.8.3 can't weaken refs to readonly vars
540 # (e.g. string constants). This *can* be solved by:
542 #Internals::SetReadWrite($foo);
543 #Scalar::Util::weaken ($foo);
544 #Internals::SetReadOnly($foo);
546 # but requires XS and is just too damn crazy
547 # so simply throw a better exception
548 my $weak_simple = "do { Scalar::Util::weaken(${simple}); no warnings 'void'; $get }";
549 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
550 eval { Scalar::Util::weaken($simple); 1 }
551 ? do { no warnings 'void'; $get }
553 if( \$@ =~ /Modification of a read-only value attempted/) {
555 Carp::croak( sprintf (
556 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
569 sub _generate_getset {
570 my ($self, $name, $spec) = @_;
571 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
572 ."\n : ".$self->_generate_get($name, $spec)."\n )";
575 sub _generate_asserter {
576 my ($self, $name, $spec) = @_;
579 ." my \$val = ".$self->_generate_get($name, $spec).";\n"
580 ." unless (".$self->_generate_simple_has('$_[0]', $name, $spec).") {\n"
581 .qq! die "Attempted to access '${name}' but it is not set";\n!
586 sub _generate_delegation {
587 my ($self, $asserter, $target, $args) = @_;
588 my $arg_string = do {
590 # I could, I reckon, linearise out non-refs here using perlstring
591 # plus something to check for numbers but I'm unsure if it's worth it
592 $self->{captures}{'@curries'} = $args;
598 "shift->${asserter}->${target}(${arg_string});";
602 my ($self, $type, $into, $name, $slot) = @_;
603 Class::XSAccessor->import(
605 $type => { $name => $slot },
611 sub default_construction_string { '{}' }
613 sub _validate_codulatable {
614 my ($self, $setting, $value, $into, $appended) = @_;
615 my $invalid = "Invalid $setting '" . overload::StrVal($value)
616 . "' for $into not a coderef";
617 $invalid .= " $appended" if $appended;
619 unless (ref $value and (ref $value eq 'CODE' or blessed($value))) {
620 die "$invalid or code-convertible object";
623 unless (eval { \&$value }) {
624 die "$invalid and could not be converted to a coderef: $@";