1 package Method::Generate::Accessor;
5 use base qw(Moo::Object);
8 use Scalar::Util 'blessed';
14 _maybe_load_module('Class::XSAccessor')
16 (eval { Class::XSAccessor->VERSION('1.07') })
21 my ($self, $into, $name, $spec, $quote_opts) = @_;
23 die "Must have an is" unless my $is = $spec->{is};
25 $spec->{reader} = $name unless exists $spec->{reader};
26 } elsif ($is eq 'rw') {
27 $spec->{accessor} = $name unless exists $spec->{accessor};
28 } elsif ($is eq 'lazy') {
29 $spec->{reader} = $name unless exists $spec->{reader};
31 $spec->{builder} ||= '_build_'.$name unless $spec->{default};
32 } elsif ($is eq 'rwp') {
33 $spec->{reader} = $name unless exists $spec->{reader};
34 $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
35 } elsif ($is ne 'bare') {
36 die "Unknown is ${is}";
38 if (exists $spec->{builder}) {
39 if(ref $spec->{builder}) {
40 die "Invalid builder for $into->$name - not a method name, coderef or"
41 . " code-convertible object"
42 unless ref $spec->{builder} eq 'CODE'
43 or (blessed($spec->{builder}) and eval { \&{$spec->{builder}} });
44 $spec->{builder_sub} = $spec->{builder};
47 $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
48 die "Invalid builder for $into->$name - not a valid method name"
49 if $spec->{builder} !~ /\A[A-Za-z_][A-Za-z0-9_]*(?:::[A-Za-z_][A-Za-z0-9_]*)*\z/;
51 if (($spec->{predicate}||0) eq 1) {
52 $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
54 if (($spec->{clearer}||0) eq 1) {
55 $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
57 if (($spec->{trigger}||0) eq 1) {
58 $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
61 for my $setting (qw( default coerce )) {
62 next if !exists $spec->{$setting};
63 my $value = $spec->{$setting};
64 my $invalid = "Invalid $setting '" . overload::StrVal($value)
65 . "' for $into->$name - not a coderef";
66 die "$invalid or code-convertible object"
67 unless ref $value and (ref $value eq 'CODE' or blessed($value));
68 die "$invalid and could not be converted to a coderef: $@"
69 if !eval { \&$value };
73 if (my $reader = $spec->{reader}) {
74 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
75 $methods{$reader} = $self->_generate_xs(
76 getters => $into, $reader, $name, $spec
79 $self->{captures} = {};
81 quote_sub "${into}::${reader}"
82 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
83 .$self->_generate_get($name, $spec)
84 => delete $self->{captures}
88 if (my $accessor = $spec->{accessor}) {
91 && $self->is_simple_get($name, $spec)
92 && $self->is_simple_set($name, $spec)
94 $methods{$accessor} = $self->_generate_xs(
95 accessors => $into, $accessor, $name, $spec
98 $self->{captures} = {};
100 quote_sub "${into}::${accessor}"
101 => $self->_generate_getset($name, $spec)
102 => delete $self->{captures}
106 if (my $writer = $spec->{writer}) {
109 && $self->is_simple_set($name, $spec)
111 $methods{$writer} = $self->_generate_xs(
112 setters => $into, $writer, $name, $spec
115 $self->{captures} = {};
117 quote_sub "${into}::${writer}"
118 => $self->_generate_set($name, $spec)
119 => delete $self->{captures}
123 if (my $pred = $spec->{predicate}) {
125 quote_sub "${into}::${pred}" =>
126 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
129 if (my $pred = $spec->{builder_sub}) {
130 _install_coderef( "${into}::$spec->{builder}" => $spec->{builder_sub} );
132 if (my $cl = $spec->{clearer}) {
134 quote_sub "${into}::${cl}" =>
135 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
138 if (my $hspec = $spec->{handles}) {
139 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
141 if (ref($hspec) eq 'ARRAY') {
142 map [ $_ => $_ ], @$hspec;
143 } elsif (ref($hspec) eq 'HASH') {
144 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
146 } elsif (!ref($hspec)) {
147 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
149 die "You gave me a handles of ${hspec} and I have no idea why";
152 foreach my $spec (@specs) {
153 my ($proxy, $target, @args) = @$spec;
154 $self->{captures} = {};
156 quote_sub "${into}::${proxy}" =>
157 $self->_generate_delegation($asserter, $target, \@args),
158 delete $self->{captures}
162 if (my $asserter = $spec->{asserter}) {
163 $self->{captures} = {};
164 $methods{$asserter} =
165 quote_sub "${into}::${asserter}" =>
166 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
167 delete $self->{captures}
173 sub is_simple_attribute {
174 my ($self, $name, $spec) = @_;
175 # clearer doesn't have to be listed because it doesn't
176 # affect whether defined/exists makes a difference
178 qw(lazy default builder coerce isa trigger predicate weak_ref);
182 my ($self, $name, $spec) = @_;
183 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
187 my ($self, $name, $spec) = @_;
188 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
191 sub has_eager_default {
192 my ($self, $name, $spec) = @_;
193 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
197 my ($self, $name, $spec) = @_;
198 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
199 if ($self->is_simple_get($name, $spec)) {
202 'do { '.$self->_generate_use_default(
203 '$_[0]', $name, $spec,
204 $self->_generate_simple_has('$_[0]', $name, $spec),
207 ?($self->_generate_isa_check($name, $simple, $spec->{isa}).'; ')
214 sub _generate_simple_has {
215 my ($self, $me, $name) = @_;
216 "exists ${me}->{${\perlstring $name}}";
219 sub _generate_simple_clear {
220 my ($self, $me, $name) = @_;
221 " delete ${me}->{${\perlstring $name}}\n"
224 sub generate_get_default {
226 $self->{captures} = {};
227 my $code = $self->_generate_get_default(@_);
228 ($code, delete $self->{captures});
231 sub _generate_use_default {
232 my ($self, $me, $name, $spec, $test) = @_;
233 my $get_value = $self->_generate_get_default($me, $name, $spec);
234 if ($spec->{coerce}) {
235 $get_value = $self->_generate_coerce(
240 $self->_generate_simple_set(
241 $me, $name, $spec, $get_value
245 sub _generate_get_default {
246 my ($self, $me, $name, $spec) = @_;
248 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
249 : "${me}->${\$spec->{builder}}"
252 sub generate_simple_get {
253 my ($self, @args) = @_;
254 $self->_generate_simple_get(@args);
257 sub _generate_simple_get {
258 my ($self, $me, $name) = @_;
259 my $name_str = perlstring $name;
260 "${me}->{${name_str}}";
264 my ($self, $name, $spec) = @_;
265 if ($self->is_simple_set($name, $spec)) {
266 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
268 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
269 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
270 my $code = "do { my (\$self, \$value) = \@_;\n";
274 .$self->_generate_coerce($name, '$value', $coerce).";\n";
278 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
281 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
283 " ".$simple.";\n ".$fire.";\n"
286 $code .= " ".$simple.";\n";
293 sub generate_coerce {
295 $self->{captures} = {};
296 my $code = $self->_generate_coerce(@_);
297 ($code, delete $self->{captures});
301 my ($name, $init_arg) = @_;
302 return perlstring($name) if !defined($init_arg) or $init_arg eq $name;
303 return perlstring($name).' (constructor argument: '.perlstring($init_arg).')';
306 sub _generate_coerce {
307 my ($self, $name, $value, $coerce, $init_arg) = @_;
308 $self->_generate_die_prefix(
309 "coercion for ${\_attr_desc($name, $init_arg)} failed: ",
310 $self->_generate_call_code($name, 'coerce', "${value}", $coerce)
314 sub generate_trigger {
316 $self->{captures} = {};
317 my $code = $self->_generate_trigger(@_);
318 ($code, delete $self->{captures});
321 sub _generate_trigger {
322 my ($self, $name, $obj, $value, $trigger) = @_;
323 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
326 sub generate_isa_check {
327 my ($self, @args) = @_;
328 $self->{captures} = {};
329 my $code = $self->_generate_isa_check(@args);
330 ($code, delete $self->{captures});
333 sub _generate_die_prefix {
334 my ($self, $prefix, $inside) = @_;
336 .' my $sig_die = $SIG{__DIE__} || sub { die $_[0] };'."\n"
337 .' local $SIG{__DIE__} = sub {'."\n"
338 .' $sig_die->(ref($_[0]) ? $_[0] : '.perlstring($prefix).'.$_[0]);'."\n"
344 sub _generate_isa_check {
345 my ($self, $name, $value, $check, $init_arg) = @_;
346 $self->_generate_die_prefix(
347 "isa check for ${\_attr_desc($name, $init_arg)} failed: ",
348 $self->_generate_call_code($name, 'isa_check', $value, $check)
352 sub _generate_call_code {
353 my ($self, $name, $type, $values, $sub) = @_;
354 if (my $quoted = quoted_from_sub($sub)) {
355 my $code = $quoted->[1];
356 if (my $captures = $quoted->[2]) {
357 my $cap_name = qq{\$${type}_captures_for_${name}};
358 $self->{captures}->{$cap_name} = \$captures;
359 Sub::Quote::inlinify(
360 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6), 1
363 Sub::Quote::inlinify($code, $values, undef, 1);
366 my $cap_name = qq{\$${type}_for_${name}};
367 $self->{captures}->{$cap_name} = \$sub;
368 "${cap_name}->(${values})";
372 sub generate_populate_set {
374 $self->{captures} = {};
375 my $code = $self->_generate_populate_set(@_);
376 ($code, delete $self->{captures});
379 sub _generate_populate_set {
380 my ($self, $me, $name, $spec, $source, $test, $init_arg) = @_;
381 if ($self->has_eager_default($name, $spec)) {
382 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
383 my $get_default = $self->_generate_get_default(
387 defined($spec->{init_arg})
388 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
392 if ($spec->{coerce}) {
393 $get_value = $self->_generate_coerce(
395 $spec->{coerce}, $init_arg
399 ? " {\n my \$value = ".$get_value.";\n "
400 .$self->_generate_isa_check(
401 $name, '$value', $spec->{isa}, $init_arg
403 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
405 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
409 .$self->_generate_trigger(
410 $name, $me, $self->_generate_simple_get($me, $name, $spec),
419 .$self->_generate_coerce(
421 $spec->{coerce}, $init_arg
427 .$self->_generate_isa_check(
428 $name, $source, $spec->{isa}, $init_arg
432 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
435 .$self->_generate_trigger(
436 $name, $me, $self->_generate_simple_get($me, $name, $spec),
445 sub _generate_core_set {
446 my ($self, $me, $name, $spec, $value) = @_;
447 my $name_str = perlstring $name;
448 "${me}->{${name_str}} = ${value}";
451 sub _generate_simple_set {
452 my ($self, $me, $name, $spec, $value) = @_;
453 my $name_str = perlstring $name;
455 if ($spec->{weak_ref}) {
456 $value = '$preserve = '.$value;
457 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
458 require Scalar::Util;
460 # Perl < 5.8.3 can't weaken refs to readonly vars
461 # (e.g. string constants). This *can* be solved by:
463 #Internals::SetReadWrite($foo);
464 #Scalar::Util::weaken ($foo);
465 #Internals::SetReadOnly($foo);
467 # but requires XS and is just too damn crazy
468 # so simply throw a better exception
469 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple}); no warnings 'void'; \$preserve";
470 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
473 eval { Scalar::Util::weaken($simple); 1 }
474 ? do { no warnings 'void'; \$preserve; }
476 if( \$@ =~ /Modification of a read-only value attempted/) {
478 Carp::croak( sprintf (
479 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
488 $self->_generate_core_set($me, $name, $spec, $value);
492 sub _generate_getset {
493 my ($self, $name, $spec) = @_;
494 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
495 ."\n : ".$self->_generate_get($name, $spec)."\n )";
498 sub _generate_delegation {
499 my ($self, $asserter, $target, $args) = @_;
500 my $arg_string = do {
502 # I could, I reckon, linearise out non-refs here using perlstring
503 # plus something to check for numbers but I'm unsure if it's worth it
504 $self->{captures}{'@curries'} = $args;
510 "shift->${asserter}->${target}(${arg_string});";
514 my ($self, $type, $into, $name, $slot) = @_;
515 Class::XSAccessor->import(
517 $type => { $name => $slot },
523 sub default_construction_string { '{}' }