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 # default can be either a coderef or an overloaded object
49 die "Invalid default $default" unless ref $default
50 and ( ref $default eq 'CODE' or eval { \&$default } );
54 if (my $reader = $spec->{reader}) {
55 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
56 $methods{$reader} = $self->_generate_xs(
57 getters => $into, $reader, $name, $spec
60 $self->{captures} = {};
62 quote_sub "${into}::${reader}"
63 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
64 .$self->_generate_get($name, $spec)
65 => delete $self->{captures}
69 if (my $accessor = $spec->{accessor}) {
72 && $self->is_simple_get($name, $spec)
73 && $self->is_simple_set($name, $spec)
75 $methods{$accessor} = $self->_generate_xs(
76 accessors => $into, $accessor, $name, $spec
79 $self->{captures} = {};
81 quote_sub "${into}::${accessor}"
82 => $self->_generate_getset($name, $spec)
83 => delete $self->{captures}
87 if (my $writer = $spec->{writer}) {
90 && $self->is_simple_set($name, $spec)
92 $methods{$writer} = $self->_generate_xs(
93 setters => $into, $writer, $name, $spec
96 $self->{captures} = {};
98 quote_sub "${into}::${writer}"
99 => $self->_generate_set($name, $spec)
100 => delete $self->{captures}
104 if (my $pred = $spec->{predicate}) {
106 quote_sub "${into}::${pred}" =>
107 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
110 if (my $cl = $spec->{clearer}) {
112 quote_sub "${into}::${cl}" =>
113 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
116 if (my $hspec = $spec->{handles}) {
117 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
119 if (ref($hspec) eq 'ARRAY') {
120 map [ $_ => $_ ], @$hspec;
121 } elsif (ref($hspec) eq 'HASH') {
122 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
124 } elsif (!ref($hspec)) {
125 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
127 die "You gave me a handles of ${hspec} and I have no idea why";
130 foreach my $spec (@specs) {
131 my ($proxy, $target, @args) = @$spec;
132 $self->{captures} = {};
134 quote_sub "${into}::${proxy}" =>
135 $self->_generate_delegation($asserter, $target, \@args),
136 delete $self->{captures}
140 if (my $asserter = $spec->{asserter}) {
141 $self->{captures} = {};
142 $methods{$asserter} =
143 quote_sub "${into}::${asserter}" =>
144 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
145 delete $self->{captures}
151 sub is_simple_attribute {
152 my ($self, $name, $spec) = @_;
153 # clearer doesn't have to be listed because it doesn't
154 # affect whether defined/exists makes a difference
156 qw(lazy default builder coerce isa trigger predicate weak_ref);
160 my ($self, $name, $spec) = @_;
161 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
165 my ($self, $name, $spec) = @_;
166 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
169 sub has_eager_default {
170 my ($self, $name, $spec) = @_;
171 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
175 my ($self, $name, $spec) = @_;
176 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
177 if ($self->is_simple_get($name, $spec)) {
180 'do { '.$self->_generate_use_default(
181 '$_[0]', $name, $spec,
182 $self->_generate_simple_has('$_[0]', $name, $spec),
185 ?($self->_generate_isa_check($name, $simple, $spec->{isa}).'; ')
192 sub _generate_simple_has {
193 my ($self, $me, $name) = @_;
194 "exists ${me}->{${\perlstring $name}}";
197 sub _generate_simple_clear {
198 my ($self, $me, $name) = @_;
199 " delete ${me}->{${\perlstring $name}}\n"
202 sub generate_get_default {
204 $self->{captures} = {};
205 my $code = $self->_generate_get_default(@_);
206 ($code, delete $self->{captures});
209 sub _generate_use_default {
210 my ($self, $me, $name, $spec, $test) = @_;
211 my $get_value = $self->_generate_get_default($me, $name, $spec);
212 if ($spec->{coerce}) {
213 $get_value = $self->_generate_coerce(
218 $self->_generate_simple_set(
219 $me, $name, $spec, $get_value
223 sub _generate_get_default {
224 my ($self, $me, $name, $spec) = @_;
226 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
227 : "${me}->${\$spec->{builder}}"
230 sub generate_simple_get {
231 my ($self, @args) = @_;
232 $self->_generate_simple_get(@args);
235 sub _generate_simple_get {
236 my ($self, $me, $name) = @_;
237 my $name_str = perlstring $name;
238 "${me}->{${name_str}}";
242 my ($self, $name, $spec) = @_;
243 if ($self->is_simple_set($name, $spec)) {
244 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
246 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
247 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
248 my $code = "do { my (\$self, \$value) = \@_;\n";
252 .$self->_generate_coerce($name, '$value', $coerce).";\n";
256 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
259 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
261 " ".$simple.";\n ".$fire.";\n"
264 $code .= " ".$simple.";\n";
271 sub generate_coerce {
273 $self->{captures} = {};
274 my $code = $self->_generate_coerce(@_);
275 ($code, delete $self->{captures});
278 sub _generate_coerce {
279 my ($self, $name, $value, $coerce) = @_;
280 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
283 sub generate_trigger {
285 $self->{captures} = {};
286 my $code = $self->_generate_trigger(@_);
287 ($code, delete $self->{captures});
290 sub _generate_trigger {
291 my ($self, $name, $obj, $value, $trigger) = @_;
292 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
295 sub generate_isa_check {
296 my ($self, @args) = @_;
297 $self->{captures} = {};
298 my $code = $self->_generate_isa_check(@args);
299 ($code, delete $self->{captures});
302 sub _generate_isa_check {
303 my ($self, $name, $value, $check) = @_;
304 $self->_generate_call_code($name, 'isa_check', $value, $check);
307 sub _generate_call_code {
308 my ($self, $name, $type, $values, $sub) = @_;
309 if (my $quoted = quoted_from_sub($sub)) {
310 my $code = $quoted->[1];
311 my $at_ = '@_ = ('.$values.');';
312 if (my $captures = $quoted->[2]) {
313 my $cap_name = qq{\$${type}_captures_for_${name}};
314 $self->{captures}->{$cap_name} = \$captures;
315 Sub::Quote::inlinify(
316 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
319 Sub::Quote::inlinify($code, $values);
322 my $cap_name = qq{\$${type}_for_${name}};
323 $self->{captures}->{$cap_name} = \$sub;
324 "${cap_name}->(${values})";
328 sub generate_populate_set {
330 $self->{captures} = {};
331 my $code = $self->_generate_populate_set(@_);
332 ($code, delete $self->{captures});
335 sub _generate_populate_set {
336 my ($self, $me, $name, $spec, $source, $test) = @_;
337 if ($self->has_eager_default($name, $spec)) {
338 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
339 my $get_default = $self->_generate_get_default(
343 defined($spec->{init_arg})
344 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
348 if ($spec->{coerce}) {
349 $get_value = $self->_generate_coerce(
355 ? " {\n my \$value = ".$get_value.";\n "
356 .$self->_generate_isa_check(
357 $name, '$value', $spec->{isa}
359 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
361 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
365 .$self->_generate_trigger(
366 $name, $me, $self->_generate_simple_get($me, $name, $spec),
375 .$self->_generate_coerce(
383 .$self->_generate_isa_check(
384 $name, $source, $spec->{isa}
388 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
391 .$self->_generate_trigger(
392 $name, $me, $self->_generate_simple_get($me, $name, $spec),
401 sub _generate_core_set {
402 my ($self, $me, $name, $spec, $value) = @_;
403 my $name_str = perlstring $name;
404 "${me}->{${name_str}} = ${value}";
407 sub _generate_simple_set {
408 my ($self, $me, $name, $spec, $value) = @_;
409 my $name_str = perlstring $name;
411 if ($spec->{weak_ref}) {
412 $value = '$preserve = '.$value;
413 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
414 require Scalar::Util;
416 # Perl < 5.8.3 can't weaken refs to readonly vars
417 # (e.g. string constants). This *can* be solved by:
419 #Internals::SetReadWrite($foo);
420 #Scalar::Util::weaken ($foo);
421 #Internals::SetReadOnly($foo);
423 # but requires XS and is just too damn crazy
424 # so simply throw a better exception
425 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
426 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
429 eval { Scalar::Util::weaken($simple); 1 } or do {
430 if( \$@ =~ /Modification of a read-only value attempted/) {
432 Carp::croak( sprintf (
433 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
442 $self->_generate_core_set($me, $name, $spec, $value);
446 sub _generate_getset {
447 my ($self, $name, $spec) = @_;
448 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
449 ."\n : ".$self->_generate_get($name, $spec)."\n )";
452 sub _generate_delegation {
453 my ($self, $asserter, $target, $args) = @_;
454 my $arg_string = do {
456 # I could, I reckon, linearise out non-refs here using perlstring
457 # plus something to check for numbers but I'm unsure if it's worth it
458 $self->{captures}{'@curries'} = $args;
464 "shift->${asserter}->${target}(${arg_string});";
468 my ($self, $type, $into, $name, $slot) = @_;
469 Class::XSAccessor->import(
471 $type => { $name => $slot },
477 sub default_construction_string { '{}' }