1 package Method::Generate::Accessor;
5 use base qw(Moo::Object);
12 _maybe_load_module('Class::XSAccessor')
14 (eval { Class::XSAccessor->VERSION('1.07') })
19 my ($self, $into, $name, $spec, $quote_opts) = @_;
21 die "Must have an is" unless my $is = $spec->{is};
23 $spec->{reader} = $name unless exists $spec->{reader};
24 } elsif ($is eq 'rw') {
25 $spec->{accessor} = $name unless exists $spec->{accessor};
26 } elsif ($is eq 'lazy') {
27 $spec->{reader} = $name unless exists $spec->{reader};
29 $spec->{builder} ||= '_build_'.$name unless $spec->{default};
30 } elsif ($is eq 'rwp') {
31 $spec->{reader} = $name unless exists $spec->{reader};
32 $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
33 } elsif ($is ne 'bare') {
34 die "Unknown is ${is}";
36 $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
37 if (($spec->{predicate}||0) eq 1) {
38 $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
40 if (($spec->{clearer}||0) eq 1) {
41 $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
43 if (($spec->{trigger}||0) eq 1) {
44 $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
46 if (exists $spec->{default}) {
47 my $default = $spec->{default};
49 if (not ref $default) {
50 die "Invalid default $default";
52 elsif (Scalar::Util::reftype $default ne 'CODE') {
53 if (Scalar::Util::blessed $default) {
54 die "Invalid default $default" unless $default->can('(&{}');
57 die "Invalid default $default";
63 if (my $reader = $spec->{reader}) {
64 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
65 $methods{$reader} = $self->_generate_xs(
66 getters => $into, $reader, $name, $spec
69 $self->{captures} = {};
71 quote_sub "${into}::${reader}"
72 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
73 .$self->_generate_get($name, $spec)
74 => delete $self->{captures}
78 if (my $accessor = $spec->{accessor}) {
81 && $self->is_simple_get($name, $spec)
82 && $self->is_simple_set($name, $spec)
84 $methods{$accessor} = $self->_generate_xs(
85 accessors => $into, $accessor, $name, $spec
88 $self->{captures} = {};
90 quote_sub "${into}::${accessor}"
91 => $self->_generate_getset($name, $spec)
92 => delete $self->{captures}
96 if (my $writer = $spec->{writer}) {
99 && $self->is_simple_set($name, $spec)
101 $methods{$writer} = $self->_generate_xs(
102 setters => $into, $writer, $name, $spec
105 $self->{captures} = {};
107 quote_sub "${into}::${writer}"
108 => $self->_generate_set($name, $spec)
109 => delete $self->{captures}
113 if (my $pred = $spec->{predicate}) {
115 quote_sub "${into}::${pred}" =>
116 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
119 if (my $cl = $spec->{clearer}) {
121 quote_sub "${into}::${cl}" =>
122 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
125 if (my $hspec = $spec->{handles}) {
126 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
128 if (ref($hspec) eq 'ARRAY') {
129 map [ $_ => $_ ], @$hspec;
130 } elsif (ref($hspec) eq 'HASH') {
131 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
133 } elsif (!ref($hspec)) {
134 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
136 die "You gave me a handles of ${hspec} and I have no idea why";
139 foreach my $spec (@specs) {
140 my ($proxy, $target, @args) = @$spec;
141 $self->{captures} = {};
143 quote_sub "${into}::${proxy}" =>
144 $self->_generate_delegation($asserter, $target, \@args),
145 delete $self->{captures}
149 if (my $asserter = $spec->{asserter}) {
150 $self->{captures} = {};
151 $methods{$asserter} =
152 quote_sub "${into}::${asserter}" =>
153 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
154 delete $self->{captures}
160 sub is_simple_attribute {
161 my ($self, $name, $spec) = @_;
162 # clearer doesn't have to be listed because it doesn't
163 # affect whether defined/exists makes a difference
165 qw(lazy default builder coerce isa trigger predicate weak_ref);
169 my ($self, $name, $spec) = @_;
170 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
174 my ($self, $name, $spec) = @_;
175 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
178 sub has_eager_default {
179 my ($self, $name, $spec) = @_;
180 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
184 my ($self, $name, $spec) = @_;
185 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
186 if ($self->is_simple_get($name, $spec)) {
189 'do { '.$self->_generate_use_default(
190 '$_[0]', $name, $spec,
191 $self->_generate_simple_has('$_[0]', $name, $spec),
196 sub _generate_simple_has {
197 my ($self, $me, $name) = @_;
198 "exists ${me}->{${\perlstring $name}}";
201 sub _generate_simple_clear {
202 my ($self, $me, $name) = @_;
203 " delete ${me}->{${\perlstring $name}}\n"
206 sub generate_get_default {
208 $self->{captures} = {};
209 my $code = $self->_generate_get_default(@_);
210 ($code, delete $self->{captures});
213 sub _generate_use_default {
214 my ($self, $me, $name, $spec, $test) = @_;
215 my $get_value = $self->_generate_get_default($me, $name, $spec);
216 if ($spec->{coerce}) {
217 $get_value = $self->_generate_coerce(
222 $self->_generate_simple_set(
223 $me, $name, $spec, $get_value
227 sub _generate_get_default {
228 my ($self, $me, $name, $spec) = @_;
230 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
231 : "${me}->${\$spec->{builder}}"
234 sub generate_simple_get {
235 my ($self, @args) = @_;
236 $self->_generate_simple_get(@args);
239 sub _generate_simple_get {
240 my ($self, $me, $name) = @_;
241 my $name_str = perlstring $name;
242 "${me}->{${name_str}}";
246 my ($self, $name, $spec) = @_;
247 if ($self->is_simple_set($name, $spec)) {
248 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
250 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
251 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
252 my $code = "do { my (\$self, \$value) = \@_;\n";
256 .$self->_generate_coerce($name, '$value', $coerce).";\n";
260 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
263 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
265 " ".$simple.";\n ".$fire.";\n"
268 $code .= " ".$simple.";\n";
275 sub generate_coerce {
277 $self->{captures} = {};
278 my $code = $self->_generate_coerce(@_);
279 ($code, delete $self->{captures});
282 sub _generate_coerce {
283 my ($self, $name, $value, $coerce) = @_;
284 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
287 sub generate_trigger {
289 $self->{captures} = {};
290 my $code = $self->_generate_trigger(@_);
291 ($code, delete $self->{captures});
294 sub _generate_trigger {
295 my ($self, $name, $obj, $value, $trigger) = @_;
296 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
299 sub generate_isa_check {
300 my ($self, @args) = @_;
301 $self->{captures} = {};
302 my $code = $self->_generate_isa_check(@args);
303 ($code, delete $self->{captures});
306 sub _generate_isa_check {
307 my ($self, $name, $value, $check) = @_;
308 $self->_generate_call_code($name, 'isa_check', $value, $check);
311 sub _generate_call_code {
312 my ($self, $name, $type, $values, $sub) = @_;
313 if (my $quoted = quoted_from_sub($sub)) {
314 my $code = $quoted->[1];
315 my $at_ = '@_ = ('.$values.');';
316 if (my $captures = $quoted->[2]) {
317 my $cap_name = qq{\$${type}_captures_for_${name}};
318 $self->{captures}->{$cap_name} = \$captures;
319 Sub::Quote::inlinify(
320 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
323 Sub::Quote::inlinify($code, $values);
326 my $cap_name = qq{\$${type}_for_${name}};
327 $self->{captures}->{$cap_name} = \$sub;
328 "${cap_name}->(${values})";
332 sub generate_populate_set {
334 $self->{captures} = {};
335 my $code = $self->_generate_populate_set(@_);
336 ($code, delete $self->{captures});
339 sub _generate_populate_set {
340 my ($self, $me, $name, $spec, $source, $test) = @_;
341 if ($self->has_eager_default($name, $spec)) {
342 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
343 my $get_default = $self->_generate_get_default(
347 defined($spec->{init_arg})
348 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
352 if ($spec->{coerce}) {
353 $get_value = $self->_generate_coerce(
359 ? " {\n my \$value = ".$get_value.";\n "
360 .$self->_generate_isa_check(
361 $name, '$value', $spec->{isa}
363 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
365 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
369 .$self->_generate_trigger(
370 $name, $me, $self->_generate_simple_get($me, $name, $spec),
379 .$self->_generate_coerce(
387 .$self->_generate_isa_check(
388 $name, $source, $spec->{isa}
392 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
395 .$self->_generate_trigger(
396 $name, $me, $self->_generate_simple_get($me, $name, $spec),
405 sub generate_multi_set {
406 my ($self, $me, $to_set, $from) = @_;
407 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
410 sub _generate_core_set {
411 my ($self, $me, $name, $spec, $value) = @_;
412 my $name_str = perlstring $name;
413 "${me}->{${name_str}} = ${value}";
416 sub _generate_simple_set {
417 my ($self, $me, $name, $spec, $value) = @_;
418 my $name_str = perlstring $name;
420 if ($spec->{weak_ref}) {
421 $value = '$preserve = '.$value;
422 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
423 require Scalar::Util;
425 # Perl < 5.8.3 can't weaken refs to readonly vars
426 # (e.g. string constants). This *can* be solved by:
428 #Internals::SetReadWrite($foo);
429 #Scalar::Util::weaken ($foo);
430 #Internals::SetReadOnly($foo);
432 # but requires XS and is just too damn crazy
433 # so simply throw a better exception
434 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
435 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
438 eval { Scalar::Util::weaken($simple); 1 } or do {
439 if( \$@ =~ /Modification of a read-only value attempted/) {
441 Carp::croak( sprintf (
442 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
451 $self->_generate_core_set($me, $name, $spec, $value);
455 sub _generate_getset {
456 my ($self, $name, $spec) = @_;
457 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
458 ."\n : ".$self->_generate_get($name, $spec)."\n )";
461 sub _generate_delegation {
462 my ($self, $asserter, $target, $args) = @_;
463 my $arg_string = do {
465 # I could, I reckon, linearise out non-refs here using perlstring
466 # plus something to check for numbers but I'm unsure if it's worth it
467 $self->{captures}{'@curries'} = $args;
473 "shift->${asserter}->${target}(${arg_string});";
477 my ($self, $type, $into, $name, $slot) = @_;
478 Class::XSAccessor->import(
480 $type => { $name => $slot },
486 sub default_construction_string { '{}' }