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 if (not ref $spec->{default}) {
48 die "Invalid default $spec->{default}";
50 elsif (ref $spec->{default} ne 'CODE') {
52 die "Invalid default $spec->{default}" unless Scalar::Util::blessed $spec->{default};
57 if (my $reader = $spec->{reader}) {
58 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
59 $methods{$reader} = $self->_generate_xs(
60 getters => $into, $reader, $name, $spec
63 $self->{captures} = {};
65 quote_sub "${into}::${reader}"
66 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
67 .$self->_generate_get($name, $spec)
68 => delete $self->{captures}
72 if (my $accessor = $spec->{accessor}) {
75 && $self->is_simple_get($name, $spec)
76 && $self->is_simple_set($name, $spec)
78 $methods{$accessor} = $self->_generate_xs(
79 accessors => $into, $accessor, $name, $spec
82 $self->{captures} = {};
84 quote_sub "${into}::${accessor}"
85 => $self->_generate_getset($name, $spec)
86 => delete $self->{captures}
90 if (my $writer = $spec->{writer}) {
93 && $self->is_simple_set($name, $spec)
95 $methods{$writer} = $self->_generate_xs(
96 setters => $into, $writer, $name, $spec
99 $self->{captures} = {};
101 quote_sub "${into}::${writer}"
102 => $self->_generate_set($name, $spec)
103 => delete $self->{captures}
107 if (my $pred = $spec->{predicate}) {
109 quote_sub "${into}::${pred}" =>
110 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
113 if (my $cl = $spec->{clearer}) {
115 quote_sub "${into}::${cl}" =>
116 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
119 if (my $hspec = $spec->{handles}) {
120 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
122 if (ref($hspec) eq 'ARRAY') {
123 map [ $_ => $_ ], @$hspec;
124 } elsif (ref($hspec) eq 'HASH') {
125 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
127 } elsif (!ref($hspec)) {
128 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
130 die "You gave me a handles of ${hspec} and I have no idea why";
133 foreach my $spec (@specs) {
134 my ($proxy, $target, @args) = @$spec;
135 $self->{captures} = {};
137 quote_sub "${into}::${proxy}" =>
138 $self->_generate_delegation($asserter, $target, \@args),
139 delete $self->{captures}
143 if (my $asserter = $spec->{asserter}) {
144 $self->{captures} = {};
145 $methods{$asserter} =
146 quote_sub "${into}::${asserter}" =>
147 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
148 delete $self->{captures}
154 sub is_simple_attribute {
155 my ($self, $name, $spec) = @_;
156 # clearer doesn't have to be listed because it doesn't
157 # affect whether defined/exists makes a difference
159 qw(lazy default builder coerce isa trigger predicate weak_ref);
163 my ($self, $name, $spec) = @_;
164 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
168 my ($self, $name, $spec) = @_;
169 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
172 sub has_eager_default {
173 my ($self, $name, $spec) = @_;
174 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
178 my ($self, $name, $spec) = @_;
179 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
180 if ($self->is_simple_get($name, $spec)) {
183 'do { '.$self->_generate_use_default(
184 '$_[0]', $name, $spec,
185 $self->_generate_simple_has('$_[0]', $name, $spec),
190 sub _generate_simple_has {
191 my ($self, $me, $name) = @_;
192 "exists ${me}->{${\perlstring $name}}";
195 sub _generate_simple_clear {
196 my ($self, $me, $name) = @_;
197 " delete ${me}->{${\perlstring $name}}\n"
200 sub generate_get_default {
202 $self->{captures} = {};
203 my $code = $self->_generate_get_default(@_);
204 ($code, delete $self->{captures});
207 sub _generate_use_default {
208 my ($self, $me, $name, $spec, $test) = @_;
209 my $get_value = $self->_generate_get_default($me, $name, $spec);
210 if ($spec->{coerce}) {
211 $get_value = $self->_generate_coerce(
216 $self->_generate_simple_set(
217 $me, $name, $spec, $get_value
221 sub _generate_get_default {
222 my ($self, $me, $name, $spec) = @_;
224 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
225 : "${me}->${\$spec->{builder}}"
228 sub generate_simple_get {
229 my ($self, @args) = @_;
230 $self->_generate_simple_get(@args);
233 sub _generate_simple_get {
234 my ($self, $me, $name) = @_;
235 my $name_str = perlstring $name;
236 "${me}->{${name_str}}";
240 my ($self, $name, $spec) = @_;
241 if ($self->is_simple_set($name, $spec)) {
242 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
244 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
245 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
246 my $code = "do { my (\$self, \$value) = \@_;\n";
250 .$self->_generate_coerce($name, '$value', $coerce).";\n";
254 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
257 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
259 " ".$simple.";\n ".$fire.";\n"
262 $code .= " ".$simple.";\n";
269 sub generate_coerce {
271 $self->{captures} = {};
272 my $code = $self->_generate_coerce(@_);
273 ($code, delete $self->{captures});
276 sub _generate_coerce {
277 my ($self, $name, $value, $coerce) = @_;
278 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
281 sub generate_trigger {
283 $self->{captures} = {};
284 my $code = $self->_generate_trigger(@_);
285 ($code, delete $self->{captures});
288 sub _generate_trigger {
289 my ($self, $name, $obj, $value, $trigger) = @_;
290 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
293 sub generate_isa_check {
294 my ($self, @args) = @_;
295 $self->{captures} = {};
296 my $code = $self->_generate_isa_check(@args);
297 ($code, delete $self->{captures});
300 sub _generate_isa_check {
301 my ($self, $name, $value, $check) = @_;
302 $self->_generate_call_code($name, 'isa_check', $value, $check);
305 sub _generate_call_code {
306 my ($self, $name, $type, $values, $sub) = @_;
307 if (my $quoted = quoted_from_sub($sub)) {
308 my $code = $quoted->[1];
309 my $at_ = '@_ = ('.$values.');';
310 if (my $captures = $quoted->[2]) {
311 my $cap_name = qq{\$${type}_captures_for_${name}};
312 $self->{captures}->{$cap_name} = \$captures;
313 Sub::Quote::inlinify(
314 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
317 Sub::Quote::inlinify($code, $values);
320 my $cap_name = qq{\$${type}_for_${name}};
321 $self->{captures}->{$cap_name} = \$sub;
322 "${cap_name}->(${values})";
326 sub generate_populate_set {
328 $self->{captures} = {};
329 my $code = $self->_generate_populate_set(@_);
330 ($code, delete $self->{captures});
333 sub _generate_populate_set {
334 my ($self, $me, $name, $spec, $source, $test) = @_;
335 if ($self->has_eager_default($name, $spec)) {
336 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
337 my $get_default = $self->_generate_get_default(
341 defined($spec->{init_arg})
342 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
346 if ($spec->{coerce}) {
347 $get_value = $self->_generate_coerce(
353 ? " {\n my \$value = ".$get_value.";\n "
354 .$self->_generate_isa_check(
355 $name, '$value', $spec->{isa}
357 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
359 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
363 .$self->_generate_trigger(
364 $name, $me, $self->_generate_simple_get($me, $name, $spec),
373 .$self->_generate_coerce(
381 .$self->_generate_isa_check(
382 $name, $source, $spec->{isa}
386 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
389 .$self->_generate_trigger(
390 $name, $me, $self->_generate_simple_get($me, $name, $spec),
399 sub generate_multi_set {
400 my ($self, $me, $to_set, $from) = @_;
401 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
404 sub _generate_core_set {
405 my ($self, $me, $name, $spec, $value) = @_;
406 my $name_str = perlstring $name;
407 "${me}->{${name_str}} = ${value}";
410 sub _generate_simple_set {
411 my ($self, $me, $name, $spec, $value) = @_;
412 my $name_str = perlstring $name;
414 if ($spec->{weak_ref}) {
415 $value = '$preserve = '.$value;
416 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
417 require Scalar::Util;
419 # Perl < 5.8.3 can't weaken refs to readonly vars
420 # (e.g. string constants). This *can* be solved by:
422 #Internals::SetReadWrite($foo);
423 #Scalar::Util::weaken ($foo);
424 #Internals::SetReadOnly($foo);
426 # but requires XS and is just too damn crazy
427 # so simply throw a better exception
428 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
429 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
432 eval { Scalar::Util::weaken($simple); 1 } or do {
433 if( \$@ =~ /Modification of a read-only value attempted/) {
435 Carp::croak( sprintf (
436 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
445 $self->_generate_core_set($me, $name, $spec, $value);
449 sub _generate_getset {
450 my ($self, $name, $spec) = @_;
451 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
452 ."\n : ".$self->_generate_get($name, $spec)."\n )";
455 sub _generate_delegation {
456 my ($self, $asserter, $target, $args) = @_;
457 my $arg_string = do {
459 # I could, I reckon, linearise out non-refs here using perlstring
460 # plus something to check for numbers but I'm unsure if it's worth it
461 $self->{captures}{'@curries'} = $args;
467 "shift->${asserter}->${target}(${arg_string});";
471 my ($self, $type, $into, $name, $slot) = @_;
472 Class::XSAccessor->import(
474 $type => { $name => $slot },
480 sub default_construction_string { '{}' }