1 package Method::Generate::Accessor;
5 use base qw(Moo::Object);
8 use Scalar::Util 'blessed';
13 _maybe_load_module('Class::XSAccessor')
15 (eval { Class::XSAccessor->VERSION('1.07') })
20 my ($self, $into, $name, $spec, $quote_opts) = @_;
22 die "Must have an is" unless my $is = $spec->{is};
24 $spec->{reader} = $name unless exists $spec->{reader};
25 } elsif ($is eq 'rw') {
26 $spec->{accessor} = $name unless exists $spec->{accessor};
27 } elsif ($is eq 'lazy') {
28 $spec->{reader} = $name unless exists $spec->{reader};
30 $spec->{builder} ||= '_build_'.$name unless $spec->{default};
31 } elsif ($is eq 'rwp') {
32 $spec->{reader} = $name unless exists $spec->{reader};
33 $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
34 } elsif ($is ne 'bare') {
35 die "Unknown is ${is}";
37 $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
38 if (($spec->{predicate}||0) eq 1) {
39 $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
41 if (($spec->{clearer}||0) eq 1) {
42 $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
44 if (($spec->{trigger}||0) eq 1) {
45 $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
48 for my $setting (qw( default coerce )) {
49 next if !exists $spec->{$setting};
50 my $value = $spec->{$setting};
51 my $invalid = "Invalid $setting '" . overload::StrVal($value)
52 . "' for $into->$name - not a coderef";
53 die "$invalid or code-convertible object"
54 unless ref $value and (ref $value eq 'CODE' or blessed($value));
55 die "$invalid and could not be converted to a coderef: $@"
56 if !eval { \&$value };
60 if (my $reader = $spec->{reader}) {
61 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
62 $methods{$reader} = $self->_generate_xs(
63 getters => $into, $reader, $name, $spec
66 $self->{captures} = {};
68 quote_sub "${into}::${reader}"
69 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
70 .$self->_generate_get($name, $spec)
71 => delete $self->{captures}
75 if (my $accessor = $spec->{accessor}) {
78 && $self->is_simple_get($name, $spec)
79 && $self->is_simple_set($name, $spec)
81 $methods{$accessor} = $self->_generate_xs(
82 accessors => $into, $accessor, $name, $spec
85 $self->{captures} = {};
87 quote_sub "${into}::${accessor}"
88 => $self->_generate_getset($name, $spec)
89 => delete $self->{captures}
93 if (my $writer = $spec->{writer}) {
96 && $self->is_simple_set($name, $spec)
98 $methods{$writer} = $self->_generate_xs(
99 setters => $into, $writer, $name, $spec
102 $self->{captures} = {};
104 quote_sub "${into}::${writer}"
105 => $self->_generate_set($name, $spec)
106 => delete $self->{captures}
110 if (my $pred = $spec->{predicate}) {
112 quote_sub "${into}::${pred}" =>
113 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
116 if (my $cl = $spec->{clearer}) {
118 quote_sub "${into}::${cl}" =>
119 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
122 if (my $hspec = $spec->{handles}) {
123 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
125 if (ref($hspec) eq 'ARRAY') {
126 map [ $_ => $_ ], @$hspec;
127 } elsif (ref($hspec) eq 'HASH') {
128 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
130 } elsif (!ref($hspec)) {
131 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
133 die "You gave me a handles of ${hspec} and I have no idea why";
136 foreach my $spec (@specs) {
137 my ($proxy, $target, @args) = @$spec;
138 $self->{captures} = {};
140 quote_sub "${into}::${proxy}" =>
141 $self->_generate_delegation($asserter, $target, \@args),
142 delete $self->{captures}
146 if (my $asserter = $spec->{asserter}) {
147 $self->{captures} = {};
148 $methods{$asserter} =
149 quote_sub "${into}::${asserter}" =>
150 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
151 delete $self->{captures}
157 sub is_simple_attribute {
158 my ($self, $name, $spec) = @_;
159 # clearer doesn't have to be listed because it doesn't
160 # affect whether defined/exists makes a difference
162 qw(lazy default builder coerce isa trigger predicate weak_ref);
166 my ($self, $name, $spec) = @_;
167 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
171 my ($self, $name, $spec) = @_;
172 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
175 sub has_eager_default {
176 my ($self, $name, $spec) = @_;
177 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
181 my ($self, $name, $spec) = @_;
182 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
183 if ($self->is_simple_get($name, $spec)) {
186 'do { '.$self->_generate_use_default(
187 '$_[0]', $name, $spec,
188 $self->_generate_simple_has('$_[0]', $name, $spec),
191 ?($self->_generate_isa_check($name, $simple, $spec->{isa}).'; ')
198 sub _generate_simple_has {
199 my ($self, $me, $name) = @_;
200 "exists ${me}->{${\perlstring $name}}";
203 sub _generate_simple_clear {
204 my ($self, $me, $name) = @_;
205 " delete ${me}->{${\perlstring $name}}\n"
208 sub generate_get_default {
210 $self->{captures} = {};
211 my $code = $self->_generate_get_default(@_);
212 ($code, delete $self->{captures});
215 sub _generate_use_default {
216 my ($self, $me, $name, $spec, $test) = @_;
217 my $get_value = $self->_generate_get_default($me, $name, $spec);
218 if ($spec->{coerce}) {
219 $get_value = $self->_generate_coerce(
224 $self->_generate_simple_set(
225 $me, $name, $spec, $get_value
229 sub _generate_get_default {
230 my ($self, $me, $name, $spec) = @_;
232 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
233 : "${me}->${\$spec->{builder}}"
236 sub generate_simple_get {
237 my ($self, @args) = @_;
238 $self->_generate_simple_get(@args);
241 sub _generate_simple_get {
242 my ($self, $me, $name) = @_;
243 my $name_str = perlstring $name;
244 "${me}->{${name_str}}";
248 my ($self, $name, $spec) = @_;
249 if ($self->is_simple_set($name, $spec)) {
250 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
252 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
253 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
254 my $code = "do { my (\$self, \$value) = \@_;\n";
258 .$self->_generate_coerce($name, '$value', $coerce).";\n";
262 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
265 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
267 " ".$simple.";\n ".$fire.";\n"
270 $code .= " ".$simple.";\n";
277 sub generate_coerce {
279 $self->{captures} = {};
280 my $code = $self->_generate_coerce(@_);
281 ($code, delete $self->{captures});
284 sub _generate_coerce {
285 my ($self, $name, $value, $coerce) = @_;
286 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
289 sub generate_trigger {
291 $self->{captures} = {};
292 my $code = $self->_generate_trigger(@_);
293 ($code, delete $self->{captures});
296 sub _generate_trigger {
297 my ($self, $name, $obj, $value, $trigger) = @_;
298 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
301 sub generate_isa_check {
302 my ($self, @args) = @_;
303 $self->{captures} = {};
304 my $code = $self->_generate_isa_check(@args);
305 ($code, delete $self->{captures});
308 sub _generate_isa_check {
309 my ($self, $name, $value, $check) = @_;
310 $self->_generate_call_code($name, 'isa_check', $value, $check);
313 sub _generate_call_code {
314 my ($self, $name, $type, $values, $sub) = @_;
315 if (my $quoted = quoted_from_sub($sub)) {
316 my $code = $quoted->[1];
317 my $at_ = '@_ = ('.$values.');';
318 if (my $captures = $quoted->[2]) {
319 my $cap_name = qq{\$${type}_captures_for_${name}};
320 $self->{captures}->{$cap_name} = \$captures;
321 Sub::Quote::inlinify(
322 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
325 Sub::Quote::inlinify($code, $values);
328 my $cap_name = qq{\$${type}_for_${name}};
329 $self->{captures}->{$cap_name} = \$sub;
330 "${cap_name}->(${values})";
334 sub generate_populate_set {
336 $self->{captures} = {};
337 my $code = $self->_generate_populate_set(@_);
338 ($code, delete $self->{captures});
341 sub _generate_populate_set {
342 my ($self, $me, $name, $spec, $source, $test) = @_;
343 if ($self->has_eager_default($name, $spec)) {
344 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
345 my $get_default = $self->_generate_get_default(
349 defined($spec->{init_arg})
350 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
354 if ($spec->{coerce}) {
355 $get_value = $self->_generate_coerce(
361 ? " {\n my \$value = ".$get_value.";\n "
362 .$self->_generate_isa_check(
363 $name, '$value', $spec->{isa}
365 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
367 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
371 .$self->_generate_trigger(
372 $name, $me, $self->_generate_simple_get($me, $name, $spec),
381 .$self->_generate_coerce(
389 .$self->_generate_isa_check(
390 $name, $source, $spec->{isa}
394 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
397 .$self->_generate_trigger(
398 $name, $me, $self->_generate_simple_get($me, $name, $spec),
407 sub _generate_core_set {
408 my ($self, $me, $name, $spec, $value) = @_;
409 my $name_str = perlstring $name;
410 "${me}->{${name_str}} = ${value}";
413 sub _generate_simple_set {
414 my ($self, $me, $name, $spec, $value) = @_;
415 my $name_str = perlstring $name;
417 if ($spec->{weak_ref}) {
418 $value = '$preserve = '.$value;
419 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
420 require Scalar::Util;
422 # Perl < 5.8.3 can't weaken refs to readonly vars
423 # (e.g. string constants). This *can* be solved by:
425 #Internals::SetReadWrite($foo);
426 #Scalar::Util::weaken ($foo);
427 #Internals::SetReadOnly($foo);
429 # but requires XS and is just too damn crazy
430 # so simply throw a better exception
431 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
432 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
435 eval { Scalar::Util::weaken($simple); 1 } or do {
436 if( \$@ =~ /Modification of a read-only value attempted/) {
438 Carp::croak( sprintf (
439 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
448 $self->_generate_core_set($me, $name, $spec, $value);
452 sub _generate_getset {
453 my ($self, $name, $spec) = @_;
454 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
455 ."\n : ".$self->_generate_get($name, $spec)."\n )";
458 sub _generate_delegation {
459 my ($self, $asserter, $target, $args) = @_;
460 my $arg_string = do {
462 # I could, I reckon, linearise out non-refs here using perlstring
463 # plus something to check for numbers but I'm unsure if it's worth it
464 $self->{captures}{'@curries'} = $args;
470 "shift->${asserter}->${target}(${arg_string});";
474 my ($self, $type, $into, $name, $slot) = @_;
475 Class::XSAccessor->import(
477 $type => { $name => $slot },
483 sub default_construction_string { '{}' }