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) = @_;
20 die "Must have an is" unless my $is = $spec->{is};
22 $spec->{reader} = $name unless exists $spec->{reader};
23 } elsif ($is eq 'rw') {
24 $spec->{accessor} = $name unless exists $spec->{accessor};
25 } elsif ($is eq 'lazy') {
26 $spec->{reader} = $name unless exists $spec->{reader};
28 $spec->{builder} ||= '_build_'.$name unless $spec->{default};
29 } elsif ($is eq 'rwp') {
30 $spec->{reader} = $name unless exists $spec->{reader};
31 $spec->{writer} = "_set_${name}" unless exists $spec->{writer};
32 } elsif ($is ne 'bare') {
33 die "Unknown is ${is}";
35 $spec->{builder} = '_build_'.$name if ($spec->{builder}||0) eq 1;
36 if (($spec->{predicate}||0) eq 1) {
37 $spec->{predicate} = $name =~ /^_/ ? "_has${name}" : "has_${name}";
39 if (($spec->{clearer}||0) eq 1) {
40 $spec->{clearer} = $name =~ /^_/ ? "_clear${name}" : "clear_${name}";
42 if (($spec->{trigger}||0) eq 1) {
43 $spec->{trigger} = quote_sub('shift->_trigger_'.$name.'(@_)');
46 if (my $reader = $spec->{reader}) {
47 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
48 $methods{$reader} = $self->_generate_xs(
49 getters => $into, $reader, $name, $spec
52 $self->{captures} = {};
54 quote_sub "${into}::${reader}"
55 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
56 .$self->_generate_get($name, $spec)
57 => delete $self->{captures}
61 if (my $accessor = $spec->{accessor}) {
64 && $self->is_simple_get($name, $spec)
65 && $self->is_simple_set($name, $spec)
67 $methods{$accessor} = $self->_generate_xs(
68 accessors => $into, $accessor, $name, $spec
71 $self->{captures} = {};
73 quote_sub "${into}::${accessor}"
74 => $self->_generate_getset($name, $spec)
75 => delete $self->{captures}
79 if (my $writer = $spec->{writer}) {
82 && $self->is_simple_set($name, $spec)
84 $methods{$writer} = $self->_generate_xs(
85 setters => $into, $writer, $name, $spec
88 $self->{captures} = {};
90 quote_sub "${into}::${writer}"
91 => $self->_generate_set($name, $spec)
92 => delete $self->{captures}
96 if (my $pred = $spec->{predicate}) {
98 quote_sub "${into}::${pred}" =>
99 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
102 if (my $cl = $spec->{clearer}) {
104 quote_sub "${into}::${cl}" =>
105 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
108 if (my $hspec = $spec->{handles}) {
109 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
111 if (ref($hspec) eq 'ARRAY') {
112 map [ $_ => $_ ], @$hspec;
113 } elsif (ref($hspec) eq 'HASH') {
114 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
116 } elsif (!ref($hspec)) {
117 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
119 die "You gave me a handles of ${hspec} and I have no idea why";
122 foreach my $spec (@specs) {
123 my ($proxy, $target, @args) = @$spec;
124 $self->{captures} = {};
126 quote_sub "${into}::${proxy}" =>
127 $self->_generate_delegation($asserter, $target, \@args),
128 delete $self->{captures}
132 if (my $asserter = $spec->{asserter}) {
133 $self->{captures} = {};
134 $methods{$asserter} =
135 quote_sub "${into}::${asserter}" =>
136 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
137 delete $self->{captures}
143 sub is_simple_attribute {
144 my ($self, $name, $spec) = @_;
145 # clearer doesn't have to be listed because it doesn't
146 # affect whether defined/exists makes a difference
148 qw(lazy default builder coerce isa trigger predicate weak_ref);
152 my ($self, $name, $spec) = @_;
153 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
157 my ($self, $name, $spec) = @_;
158 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
161 sub has_eager_default {
162 my ($self, $name, $spec) = @_;
163 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
167 my ($self, $name, $spec) = @_;
168 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
169 if ($self->is_simple_get($name, $spec)) {
172 'do { '.$self->_generate_use_default(
173 '$_[0]', $name, $spec,
174 $self->_generate_simple_has('$_[0]', $name, $spec),
179 sub _generate_simple_has {
180 my ($self, $me, $name) = @_;
181 "exists ${me}->{${\perlstring $name}}";
184 sub _generate_simple_clear {
185 my ($self, $me, $name) = @_;
186 " delete ${me}->{${\perlstring $name}}\n"
189 sub generate_get_default {
191 $self->{captures} = {};
192 my $code = $self->_generate_get_default(@_);
193 ($code, delete $self->{captures});
196 sub _generate_use_default {
197 my ($self, $me, $name, $spec, $test) = @_;
198 my $get_value = $self->_generate_get_default($me, $name, $spec);
199 if ($spec->{coerce}) {
200 $get_value = $self->_generate_coerce(
205 $self->_generate_simple_set(
206 $me, $name, $spec, $get_value
210 sub _generate_get_default {
211 my ($self, $me, $name, $spec) = @_;
213 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
214 : "${me}->${\$spec->{builder}}"
217 sub generate_simple_get {
218 my ($self, @args) = @_;
219 $self->_generate_simple_get(@args);
222 sub _generate_simple_get {
223 my ($self, $me, $name) = @_;
224 my $name_str = perlstring $name;
225 "${me}->{${name_str}}";
229 my ($self, $name, $spec) = @_;
230 if ($self->is_simple_set($name, $spec)) {
231 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
233 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
234 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
235 my $code = "do { my (\$self, \$value) = \@_;\n";
239 .$self->_generate_coerce($name, '$value', $coerce).";\n";
243 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
246 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
248 " ".$simple.";\n ".$fire.";\n"
251 $code .= " ".$simple.";\n";
258 sub generate_coerce {
260 $self->{captures} = {};
261 my $code = $self->_generate_coerce(@_);
262 ($code, delete $self->{captures});
265 sub _generate_coerce {
266 my ($self, $name, $value, $coerce) = @_;
267 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
270 sub generate_trigger {
272 $self->{captures} = {};
273 my $code = $self->_generate_trigger(@_);
274 ($code, delete $self->{captures});
277 sub _generate_trigger {
278 my ($self, $name, $obj, $value, $trigger) = @_;
279 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
282 sub generate_isa_check {
283 my ($self, @args) = @_;
284 $self->{captures} = {};
285 my $code = $self->_generate_isa_check(@args);
286 ($code, delete $self->{captures});
289 sub _generate_isa_check {
290 my ($self, $name, $value, $check) = @_;
291 $self->_generate_call_code($name, 'isa_check', $value, $check);
294 sub _generate_call_code {
295 my ($self, $name, $type, $values, $sub) = @_;
296 if (my $quoted = quoted_from_sub($sub)) {
297 my $code = $quoted->[1];
298 my $at_ = '@_ = ('.$values.');';
299 if (my $captures = $quoted->[2]) {
300 my $cap_name = qq{\$${type}_captures_for_${name}};
301 $self->{captures}->{$cap_name} = \$captures;
302 Sub::Quote::inlinify(
303 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
306 Sub::Quote::inlinify($code, $values);
309 my $cap_name = qq{\$${type}_for_${name}};
310 $self->{captures}->{$cap_name} = \$sub;
311 "${cap_name}->(${values})";
315 sub generate_populate_set {
317 $self->{captures} = {};
318 my $code = $self->_generate_populate_set(@_);
319 ($code, delete $self->{captures});
322 sub _generate_populate_set {
323 my ($self, $me, $name, $spec, $source, $test) = @_;
324 if ($self->has_eager_default($name, $spec)) {
325 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
326 my $get_default = $self->_generate_get_default(
330 defined($spec->{init_arg})
331 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
335 if ($spec->{coerce}) {
336 $get_value = $self->_generate_coerce(
342 ? " {\n my \$value = ".$get_value.";\n "
343 .$self->_generate_isa_check(
344 $name, '$value', $spec->{isa}
346 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
348 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
352 .$self->_generate_trigger(
353 $name, $me, $self->_generate_simple_get($me, $name, $spec),
362 .$self->_generate_coerce(
370 .$self->_generate_isa_check(
371 $name, $source, $spec->{isa}
375 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
378 .$self->_generate_trigger(
379 $name, $me, $self->_generate_simple_get($me, $name, $spec),
388 sub generate_multi_set {
389 my ($self, $me, $to_set, $from) = @_;
390 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
393 sub _generate_core_set {
394 my ($self, $me, $name, $spec, $value) = @_;
395 my $name_str = perlstring $name;
396 "${me}->{${name_str}} = ${value}";
399 sub _generate_simple_set {
400 my ($self, $me, $name, $spec, $value) = @_;
401 my $name_str = perlstring $name;
403 if ($spec->{weak_ref}) {
404 $value = '$preserve = '.$value;
405 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
406 require Scalar::Util;
408 # Perl < 5.8.3 can't weaken refs to readonly vars
409 # (e.g. string constants). This *can* be solved by:
411 #Internals::SetReadWrite($foo);
412 #Scalar::Util::weaken ($foo);
413 #Internals::SetReadOnly($foo);
415 # but requires XS and is just too damn crazy
416 # so simply throw a better exception
417 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
418 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
421 eval { Scalar::Util::weaken($simple); 1 } or do {
422 if( \$@ =~ /Modification of a read-only value attempted/) {
424 Carp::croak( sprintf (
425 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
434 $self->_generate_core_set($me, $name, $spec, $value);
438 sub _generate_getset {
439 my ($self, $name, $spec) = @_;
440 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
441 ."\n : ".$self->_generate_get($name, $spec)."\n )";
444 sub _generate_delegation {
445 my ($self, $asserter, $target, $args) = @_;
446 my $arg_string = do {
448 # I could, I reckon, linearise out non-refs here using perlstring
449 # plus something to check for numbers but I'm unsure if it's worth it
450 $self->{captures}{'@curries'} = $args;
456 "shift->${asserter}->${target}(${arg_string});";
460 my ($self, $type, $into, $name, $slot) = @_;
461 Class::XSAccessor->import(
463 $type => { $name => $slot }
468 sub default_construction_string { '{}' }