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};
48 unless (ref $default) {
49 die "Invalid default $default";
51 if (ref $default ne 'CODE') {
52 unless (eval { \&$default }) {
53 die "Invalid default $default";
59 if (my $reader = $spec->{reader}) {
60 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
61 $methods{$reader} = $self->_generate_xs(
62 getters => $into, $reader, $name, $spec
65 $self->{captures} = {};
67 quote_sub "${into}::${reader}"
68 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
69 .$self->_generate_get($name, $spec)
70 => delete $self->{captures}
74 if (my $accessor = $spec->{accessor}) {
77 && $self->is_simple_get($name, $spec)
78 && $self->is_simple_set($name, $spec)
80 $methods{$accessor} = $self->_generate_xs(
81 accessors => $into, $accessor, $name, $spec
84 $self->{captures} = {};
86 quote_sub "${into}::${accessor}"
87 => $self->_generate_getset($name, $spec)
88 => delete $self->{captures}
92 if (my $writer = $spec->{writer}) {
95 && $self->is_simple_set($name, $spec)
97 $methods{$writer} = $self->_generate_xs(
98 setters => $into, $writer, $name, $spec
101 $self->{captures} = {};
103 quote_sub "${into}::${writer}"
104 => $self->_generate_set($name, $spec)
105 => delete $self->{captures}
109 if (my $pred = $spec->{predicate}) {
111 quote_sub "${into}::${pred}" =>
112 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
115 if (my $cl = $spec->{clearer}) {
117 quote_sub "${into}::${cl}" =>
118 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
121 if (my $hspec = $spec->{handles}) {
122 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
124 if (ref($hspec) eq 'ARRAY') {
125 map [ $_ => $_ ], @$hspec;
126 } elsif (ref($hspec) eq 'HASH') {
127 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
129 } elsif (!ref($hspec)) {
130 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
132 die "You gave me a handles of ${hspec} and I have no idea why";
135 foreach my $spec (@specs) {
136 my ($proxy, $target, @args) = @$spec;
137 $self->{captures} = {};
139 quote_sub "${into}::${proxy}" =>
140 $self->_generate_delegation($asserter, $target, \@args),
141 delete $self->{captures}
145 if (my $asserter = $spec->{asserter}) {
146 $self->{captures} = {};
147 $methods{$asserter} =
148 quote_sub "${into}::${asserter}" =>
149 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
150 delete $self->{captures}
156 sub is_simple_attribute {
157 my ($self, $name, $spec) = @_;
158 # clearer doesn't have to be listed because it doesn't
159 # affect whether defined/exists makes a difference
161 qw(lazy default builder coerce isa trigger predicate weak_ref);
165 my ($self, $name, $spec) = @_;
166 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
170 my ($self, $name, $spec) = @_;
171 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
174 sub has_eager_default {
175 my ($self, $name, $spec) = @_;
176 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
180 my ($self, $name, $spec) = @_;
181 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
182 if ($self->is_simple_get($name, $spec)) {
185 'do { '.$self->_generate_use_default(
186 '$_[0]', $name, $spec,
187 $self->_generate_simple_has('$_[0]', $name, $spec),
190 ?($self->_generate_isa_check($name, $simple, $spec->{isa}).'; ')
197 sub _generate_simple_has {
198 my ($self, $me, $name) = @_;
199 "exists ${me}->{${\perlstring $name}}";
202 sub _generate_simple_clear {
203 my ($self, $me, $name) = @_;
204 " delete ${me}->{${\perlstring $name}}\n"
207 sub generate_get_default {
209 $self->{captures} = {};
210 my $code = $self->_generate_get_default(@_);
211 ($code, delete $self->{captures});
214 sub _generate_use_default {
215 my ($self, $me, $name, $spec, $test) = @_;
216 my $get_value = $self->_generate_get_default($me, $name, $spec);
217 if ($spec->{coerce}) {
218 $get_value = $self->_generate_coerce(
223 $self->_generate_simple_set(
224 $me, $name, $spec, $get_value
228 sub _generate_get_default {
229 my ($self, $me, $name, $spec) = @_;
231 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
232 : "${me}->${\$spec->{builder}}"
235 sub generate_simple_get {
236 my ($self, @args) = @_;
237 $self->_generate_simple_get(@args);
240 sub _generate_simple_get {
241 my ($self, $me, $name) = @_;
242 my $name_str = perlstring $name;
243 "${me}->{${name_str}}";
247 my ($self, $name, $spec) = @_;
248 if ($self->is_simple_set($name, $spec)) {
249 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
251 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
252 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
253 my $code = "do { my (\$self, \$value) = \@_;\n";
257 .$self->_generate_coerce($name, '$value', $coerce).";\n";
261 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
264 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
266 " ".$simple.";\n ".$fire.";\n"
269 $code .= " ".$simple.";\n";
276 sub generate_coerce {
278 $self->{captures} = {};
279 my $code = $self->_generate_coerce(@_);
280 ($code, delete $self->{captures});
283 sub _generate_coerce {
284 my ($self, $name, $value, $coerce) = @_;
285 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
288 sub generate_trigger {
290 $self->{captures} = {};
291 my $code = $self->_generate_trigger(@_);
292 ($code, delete $self->{captures});
295 sub _generate_trigger {
296 my ($self, $name, $obj, $value, $trigger) = @_;
297 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
300 sub generate_isa_check {
301 my ($self, @args) = @_;
302 $self->{captures} = {};
303 my $code = $self->_generate_isa_check(@args);
304 ($code, delete $self->{captures});
307 sub _generate_isa_check {
308 my ($self, $name, $value, $check) = @_;
309 $self->_generate_call_code($name, 'isa_check', $value, $check);
312 sub _generate_call_code {
313 my ($self, $name, $type, $values, $sub) = @_;
314 if (my $quoted = quoted_from_sub($sub)) {
315 my $code = $quoted->[1];
316 my $at_ = '@_ = ('.$values.');';
317 if (my $captures = $quoted->[2]) {
318 my $cap_name = qq{\$${type}_captures_for_${name}};
319 $self->{captures}->{$cap_name} = \$captures;
320 Sub::Quote::inlinify(
321 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
324 Sub::Quote::inlinify($code, $values);
327 my $cap_name = qq{\$${type}_for_${name}};
328 $self->{captures}->{$cap_name} = \$sub;
329 "${cap_name}->(${values})";
333 sub generate_populate_set {
335 $self->{captures} = {};
336 my $code = $self->_generate_populate_set(@_);
337 ($code, delete $self->{captures});
340 sub _generate_populate_set {
341 my ($self, $me, $name, $spec, $source, $test) = @_;
342 if ($self->has_eager_default($name, $spec)) {
343 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
344 my $get_default = $self->_generate_get_default(
348 defined($spec->{init_arg})
349 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
353 if ($spec->{coerce}) {
354 $get_value = $self->_generate_coerce(
360 ? " {\n my \$value = ".$get_value.";\n "
361 .$self->_generate_isa_check(
362 $name, '$value', $spec->{isa}
364 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
366 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
370 .$self->_generate_trigger(
371 $name, $me, $self->_generate_simple_get($me, $name, $spec),
380 .$self->_generate_coerce(
388 .$self->_generate_isa_check(
389 $name, $source, $spec->{isa}
393 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
396 .$self->_generate_trigger(
397 $name, $me, $self->_generate_simple_get($me, $name, $spec),
406 sub _generate_core_set {
407 my ($self, $me, $name, $spec, $value) = @_;
408 my $name_str = perlstring $name;
409 "${me}->{${name_str}} = ${value}";
412 sub _generate_simple_set {
413 my ($self, $me, $name, $spec, $value) = @_;
414 my $name_str = perlstring $name;
416 if ($spec->{weak_ref}) {
417 $value = '$preserve = '.$value;
418 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
419 require Scalar::Util;
421 # Perl < 5.8.3 can't weaken refs to readonly vars
422 # (e.g. string constants). This *can* be solved by:
424 #Internals::SetReadWrite($foo);
425 #Scalar::Util::weaken ($foo);
426 #Internals::SetReadOnly($foo);
428 # but requires XS and is just too damn crazy
429 # so simply throw a better exception
430 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
431 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
434 eval { Scalar::Util::weaken($simple); 1 } or do {
435 if( \$@ =~ /Modification of a read-only value attempted/) {
437 Carp::croak( sprintf (
438 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
447 $self->_generate_core_set($me, $name, $spec, $value);
451 sub _generate_getset {
452 my ($self, $name, $spec) = @_;
453 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
454 ."\n : ".$self->_generate_get($name, $spec)."\n )";
457 sub _generate_delegation {
458 my ($self, $asserter, $target, $args) = @_;
459 my $arg_string = do {
461 # I could, I reckon, linearise out non-refs here using perlstring
462 # plus something to check for numbers but I'm unsure if it's worth it
463 $self->{captures}{'@curries'} = $args;
469 "shift->${asserter}->${target}(${arg_string});";
473 my ($self, $type, $into, $name, $slot) = @_;
474 Class::XSAccessor->import(
476 $type => { $name => $slot },
482 sub default_construction_string { '{}' }