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};
52 Scalar::Util::reftype $default eq 'CODE'
53 or Scalar::Util::blessed $default and $default->can('(&{}')
56 die "Invalid default $default";
61 if (my $reader = $spec->{reader}) {
62 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
63 $methods{$reader} = $self->_generate_xs(
64 getters => $into, $reader, $name, $spec
67 $self->{captures} = {};
69 quote_sub "${into}::${reader}"
70 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
71 .$self->_generate_get($name, $spec)
72 => delete $self->{captures}
76 if (my $accessor = $spec->{accessor}) {
79 && $self->is_simple_get($name, $spec)
80 && $self->is_simple_set($name, $spec)
82 $methods{$accessor} = $self->_generate_xs(
83 accessors => $into, $accessor, $name, $spec
86 $self->{captures} = {};
88 quote_sub "${into}::${accessor}"
89 => $self->_generate_getset($name, $spec)
90 => delete $self->{captures}
94 if (my $writer = $spec->{writer}) {
97 && $self->is_simple_set($name, $spec)
99 $methods{$writer} = $self->_generate_xs(
100 setters => $into, $writer, $name, $spec
103 $self->{captures} = {};
105 quote_sub "${into}::${writer}"
106 => $self->_generate_set($name, $spec)
107 => delete $self->{captures}
111 if (my $pred = $spec->{predicate}) {
113 quote_sub "${into}::${pred}" =>
114 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
117 if (my $cl = $spec->{clearer}) {
119 quote_sub "${into}::${cl}" =>
120 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
123 if (my $hspec = $spec->{handles}) {
124 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
126 if (ref($hspec) eq 'ARRAY') {
127 map [ $_ => $_ ], @$hspec;
128 } elsif (ref($hspec) eq 'HASH') {
129 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
131 } elsif (!ref($hspec)) {
132 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
134 die "You gave me a handles of ${hspec} and I have no idea why";
137 foreach my $spec (@specs) {
138 my ($proxy, $target, @args) = @$spec;
139 $self->{captures} = {};
141 quote_sub "${into}::${proxy}" =>
142 $self->_generate_delegation($asserter, $target, \@args),
143 delete $self->{captures}
147 if (my $asserter = $spec->{asserter}) {
148 $self->{captures} = {};
149 $methods{$asserter} =
150 quote_sub "${into}::${asserter}" =>
151 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
152 delete $self->{captures}
158 sub is_simple_attribute {
159 my ($self, $name, $spec) = @_;
160 # clearer doesn't have to be listed because it doesn't
161 # affect whether defined/exists makes a difference
163 qw(lazy default builder coerce isa trigger predicate weak_ref);
167 my ($self, $name, $spec) = @_;
168 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
172 my ($self, $name, $spec) = @_;
173 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
176 sub has_eager_default {
177 my ($self, $name, $spec) = @_;
178 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
182 my ($self, $name, $spec) = @_;
183 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
184 if ($self->is_simple_get($name, $spec)) {
187 'do { '.$self->_generate_use_default(
188 '$_[0]', $name, $spec,
189 $self->_generate_simple_has('$_[0]', $name, $spec),
194 sub _generate_simple_has {
195 my ($self, $me, $name) = @_;
196 "exists ${me}->{${\perlstring $name}}";
199 sub _generate_simple_clear {
200 my ($self, $me, $name) = @_;
201 " delete ${me}->{${\perlstring $name}}\n"
204 sub generate_get_default {
206 $self->{captures} = {};
207 my $code = $self->_generate_get_default(@_);
208 ($code, delete $self->{captures});
211 sub _generate_use_default {
212 my ($self, $me, $name, $spec, $test) = @_;
213 my $get_value = $self->_generate_get_default($me, $name, $spec);
214 if ($spec->{coerce}) {
215 $get_value = $self->_generate_coerce(
220 $self->_generate_simple_set(
221 $me, $name, $spec, $get_value
225 sub _generate_get_default {
226 my ($self, $me, $name, $spec) = @_;
228 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
229 : "${me}->${\$spec->{builder}}"
232 sub generate_simple_get {
233 my ($self, @args) = @_;
234 $self->_generate_simple_get(@args);
237 sub _generate_simple_get {
238 my ($self, $me, $name) = @_;
239 my $name_str = perlstring $name;
240 "${me}->{${name_str}}";
244 my ($self, $name, $spec) = @_;
245 if ($self->is_simple_set($name, $spec)) {
246 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
248 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
249 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
250 my $code = "do { my (\$self, \$value) = \@_;\n";
254 .$self->_generate_coerce($name, '$value', $coerce).";\n";
258 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
261 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
263 " ".$simple.";\n ".$fire.";\n"
266 $code .= " ".$simple.";\n";
273 sub generate_coerce {
275 $self->{captures} = {};
276 my $code = $self->_generate_coerce(@_);
277 ($code, delete $self->{captures});
280 sub _generate_coerce {
281 my ($self, $name, $value, $coerce) = @_;
282 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
285 sub generate_trigger {
287 $self->{captures} = {};
288 my $code = $self->_generate_trigger(@_);
289 ($code, delete $self->{captures});
292 sub _generate_trigger {
293 my ($self, $name, $obj, $value, $trigger) = @_;
294 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
297 sub generate_isa_check {
298 my ($self, @args) = @_;
299 $self->{captures} = {};
300 my $code = $self->_generate_isa_check(@args);
301 ($code, delete $self->{captures});
304 sub _generate_isa_check {
305 my ($self, $name, $value, $check) = @_;
306 $self->_generate_call_code($name, 'isa_check', $value, $check);
309 sub _generate_call_code {
310 my ($self, $name, $type, $values, $sub) = @_;
311 if (my $quoted = quoted_from_sub($sub)) {
312 my $code = $quoted->[1];
313 my $at_ = '@_ = ('.$values.');';
314 if (my $captures = $quoted->[2]) {
315 my $cap_name = qq{\$${type}_captures_for_${name}};
316 $self->{captures}->{$cap_name} = \$captures;
317 Sub::Quote::inlinify(
318 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
321 Sub::Quote::inlinify($code, $values);
324 my $cap_name = qq{\$${type}_for_${name}};
325 $self->{captures}->{$cap_name} = \$sub;
326 "${cap_name}->(${values})";
330 sub generate_populate_set {
332 $self->{captures} = {};
333 my $code = $self->_generate_populate_set(@_);
334 ($code, delete $self->{captures});
337 sub _generate_populate_set {
338 my ($self, $me, $name, $spec, $source, $test) = @_;
339 if ($self->has_eager_default($name, $spec)) {
340 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
341 my $get_default = $self->_generate_get_default(
345 defined($spec->{init_arg})
346 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
350 if ($spec->{coerce}) {
351 $get_value = $self->_generate_coerce(
357 ? " {\n my \$value = ".$get_value.";\n "
358 .$self->_generate_isa_check(
359 $name, '$value', $spec->{isa}
361 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
363 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
367 .$self->_generate_trigger(
368 $name, $me, $self->_generate_simple_get($me, $name, $spec),
377 .$self->_generate_coerce(
385 .$self->_generate_isa_check(
386 $name, $source, $spec->{isa}
390 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
393 .$self->_generate_trigger(
394 $name, $me, $self->_generate_simple_get($me, $name, $spec),
403 sub generate_multi_set {
404 my ($self, $me, $to_set, $from) = @_;
405 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
408 sub _generate_core_set {
409 my ($self, $me, $name, $spec, $value) = @_;
410 my $name_str = perlstring $name;
411 "${me}->{${name_str}} = ${value}";
414 sub _generate_simple_set {
415 my ($self, $me, $name, $spec, $value) = @_;
416 my $name_str = perlstring $name;
418 if ($spec->{weak_ref}) {
419 $value = '$preserve = '.$value;
420 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
421 require Scalar::Util;
423 # Perl < 5.8.3 can't weaken refs to readonly vars
424 # (e.g. string constants). This *can* be solved by:
426 #Internals::SetReadWrite($foo);
427 #Scalar::Util::weaken ($foo);
428 #Internals::SetReadOnly($foo);
430 # but requires XS and is just too damn crazy
431 # so simply throw a better exception
432 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
433 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
436 eval { Scalar::Util::weaken($simple); 1 } or do {
437 if( \$@ =~ /Modification of a read-only value attempted/) {
439 Carp::croak( sprintf (
440 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
449 $self->_generate_core_set($me, $name, $spec, $value);
453 sub _generate_getset {
454 my ($self, $name, $spec) = @_;
455 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
456 ."\n : ".$self->_generate_get($name, $spec)."\n )";
459 sub _generate_delegation {
460 my ($self, $asserter, $target, $args) = @_;
461 my $arg_string = do {
463 # I could, I reckon, linearise out non-refs here using perlstring
464 # plus something to check for numbers but I'm unsure if it's worth it
465 $self->{captures}{'@curries'} = $args;
471 "shift->${asserter}->${target}(${arg_string});";
475 my ($self, $type, $into, $name, $slot) = @_;
476 Class::XSAccessor->import(
478 $type => { $name => $slot },
484 sub default_construction_string { '{}' }