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.'(@_)');
47 if (my $reader = $spec->{reader}) {
48 if (our $CAN_HAZ_XS && $self->is_simple_get($name, $spec)) {
49 $methods{$reader} = $self->_generate_xs(
50 getters => $into, $reader, $name, $spec
53 $self->{captures} = {};
55 quote_sub "${into}::${reader}"
56 => ' die "'.$reader.' is a read-only accessor" if @_ > 1;'."\n"
57 .$self->_generate_get($name, $spec)
58 => delete $self->{captures}
62 if (my $accessor = $spec->{accessor}) {
65 && $self->is_simple_get($name, $spec)
66 && $self->is_simple_set($name, $spec)
68 $methods{$accessor} = $self->_generate_xs(
69 accessors => $into, $accessor, $name, $spec
72 $self->{captures} = {};
74 quote_sub "${into}::${accessor}"
75 => $self->_generate_getset($name, $spec)
76 => delete $self->{captures}
80 if (my $writer = $spec->{writer}) {
83 && $self->is_simple_set($name, $spec)
85 $methods{$writer} = $self->_generate_xs(
86 setters => $into, $writer, $name, $spec
89 $self->{captures} = {};
91 quote_sub "${into}::${writer}"
92 => $self->_generate_set($name, $spec)
93 => delete $self->{captures}
97 if (my $pred = $spec->{predicate}) {
99 quote_sub "${into}::${pred}" =>
100 ' '.$self->_generate_simple_has('$_[0]', $name, $spec)."\n"
103 if (my $cl = $spec->{clearer}) {
105 quote_sub "${into}::${cl}" =>
106 $self->_generate_simple_clear('$_[0]', $name, $spec)."\n"
109 if (my $hspec = $spec->{handles}) {
110 my $asserter = $spec->{asserter} ||= '_assert_'.$name;
112 if (ref($hspec) eq 'ARRAY') {
113 map [ $_ => $_ ], @$hspec;
114 } elsif (ref($hspec) eq 'HASH') {
115 map [ $_ => ref($hspec->{$_}) ? @{$hspec->{$_}} : $hspec->{$_} ],
117 } elsif (!ref($hspec)) {
118 map [ $_ => $_ ], Role::Tiny->methods_provided_by($hspec);
120 die "You gave me a handles of ${hspec} and I have no idea why";
123 foreach my $spec (@specs) {
124 my ($proxy, $target, @args) = @$spec;
125 $self->{captures} = {};
127 quote_sub "${into}::${proxy}" =>
128 $self->_generate_delegation($asserter, $target, \@args),
129 delete $self->{captures}
133 if (my $asserter = $spec->{asserter}) {
134 $self->{captures} = {};
135 $methods{$asserter} =
136 quote_sub "${into}::${asserter}" =>
137 'do { '.$self->_generate_get($name, $spec).qq! }||die "Attempted to access '${name}' but it is not set"!,
138 delete $self->{captures}
144 sub is_simple_attribute {
145 my ($self, $name, $spec) = @_;
146 # clearer doesn't have to be listed because it doesn't
147 # affect whether defined/exists makes a difference
149 qw(lazy default builder coerce isa trigger predicate weak_ref);
153 my ($self, $name, $spec) = @_;
154 !($spec->{lazy} and ($spec->{default} or $spec->{builder}));
158 my ($self, $name, $spec) = @_;
159 !grep $spec->{$_}, qw(coerce isa trigger weak_ref);
162 sub has_eager_default {
163 my ($self, $name, $spec) = @_;
164 (!$spec->{lazy} and ($spec->{default} or $spec->{builder}));
168 my ($self, $name, $spec) = @_;
169 my $simple = $self->_generate_simple_get('$_[0]', $name, $spec);
170 if ($self->is_simple_get($name, $spec)) {
173 'do { '.$self->_generate_use_default(
174 '$_[0]', $name, $spec,
175 $self->_generate_simple_has('$_[0]', $name, $spec),
180 sub _generate_simple_has {
181 my ($self, $me, $name) = @_;
182 "exists ${me}->{${\perlstring $name}}";
185 sub _generate_simple_clear {
186 my ($self, $me, $name) = @_;
187 " delete ${me}->{${\perlstring $name}}\n"
190 sub generate_get_default {
192 $self->{captures} = {};
193 my $code = $self->_generate_get_default(@_);
194 ($code, delete $self->{captures});
197 sub _generate_use_default {
198 my ($self, $me, $name, $spec, $test) = @_;
199 my $get_value = $self->_generate_get_default($me, $name, $spec);
200 if ($spec->{coerce}) {
201 $get_value = $self->_generate_coerce(
206 $self->_generate_simple_set(
207 $me, $name, $spec, $get_value
211 sub _generate_get_default {
212 my ($self, $me, $name, $spec) = @_;
214 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
215 : "${me}->${\$spec->{builder}}"
218 sub generate_simple_get {
219 my ($self, @args) = @_;
220 $self->_generate_simple_get(@args);
223 sub _generate_simple_get {
224 my ($self, $me, $name) = @_;
225 my $name_str = perlstring $name;
226 "${me}->{${name_str}}";
230 my ($self, $name, $spec) = @_;
231 if ($self->is_simple_set($name, $spec)) {
232 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
234 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
235 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
236 my $code = "do { my (\$self, \$value) = \@_;\n";
240 .$self->_generate_coerce($name, '$value', $coerce).";\n";
244 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
247 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
249 " ".$simple.";\n ".$fire.";\n"
252 $code .= " ".$simple.";\n";
259 sub generate_coerce {
261 $self->{captures} = {};
262 my $code = $self->_generate_coerce(@_);
263 ($code, delete $self->{captures});
266 sub _generate_coerce {
267 my ($self, $name, $value, $coerce) = @_;
268 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
271 sub generate_trigger {
273 $self->{captures} = {};
274 my $code = $self->_generate_trigger(@_);
275 ($code, delete $self->{captures});
278 sub _generate_trigger {
279 my ($self, $name, $obj, $value, $trigger) = @_;
280 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
283 sub generate_isa_check {
284 my ($self, @args) = @_;
285 $self->{captures} = {};
286 my $code = $self->_generate_isa_check(@args);
287 ($code, delete $self->{captures});
290 sub _generate_isa_check {
291 my ($self, $name, $value, $check) = @_;
292 $self->_generate_call_code($name, 'isa_check', $value, $check);
295 sub _generate_call_code {
296 my ($self, $name, $type, $values, $sub) = @_;
297 if (my $quoted = quoted_from_sub($sub)) {
298 my $code = $quoted->[1];
299 my $at_ = '@_ = ('.$values.');';
300 if (my $captures = $quoted->[2]) {
301 my $cap_name = qq{\$${type}_captures_for_${name}};
302 $self->{captures}->{$cap_name} = \$captures;
303 Sub::Quote::inlinify(
304 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
307 Sub::Quote::inlinify($code, $values);
310 my $cap_name = qq{\$${type}_for_${name}};
311 $self->{captures}->{$cap_name} = \$sub;
312 "${cap_name}->(${values})";
316 sub generate_populate_set {
318 $self->{captures} = {};
319 my $code = $self->_generate_populate_set(@_);
320 ($code, delete $self->{captures});
323 sub _generate_populate_set {
324 my ($self, $me, $name, $spec, $source, $test) = @_;
325 if ($self->has_eager_default($name, $spec)) {
326 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
327 my $get_default = $self->_generate_get_default(
331 defined($spec->{init_arg})
332 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
336 if ($spec->{coerce}) {
337 $get_value = $self->_generate_coerce(
343 ? " {\n my \$value = ".$get_value.";\n "
344 .$self->_generate_isa_check(
345 $name, '$value', $spec->{isa}
347 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
349 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
353 .$self->_generate_trigger(
354 $name, $me, $self->_generate_simple_get($me, $name, $spec),
363 .$self->_generate_coerce(
371 .$self->_generate_isa_check(
372 $name, $source, $spec->{isa}
376 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
379 .$self->_generate_trigger(
380 $name, $me, $self->_generate_simple_get($me, $name, $spec),
389 sub generate_multi_set {
390 my ($self, $me, $to_set, $from) = @_;
391 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
394 sub _generate_core_set {
395 my ($self, $me, $name, $spec, $value) = @_;
396 my $name_str = perlstring $name;
397 "${me}->{${name_str}} = ${value}";
400 sub _generate_simple_set {
401 my ($self, $me, $name, $spec, $value) = @_;
402 my $name_str = perlstring $name;
404 if ($spec->{weak_ref}) {
405 $value = '$preserve = '.$value;
406 my $simple = $self->_generate_core_set($me, $name, $spec, $value);
407 require Scalar::Util;
409 # Perl < 5.8.3 can't weaken refs to readonly vars
410 # (e.g. string constants). This *can* be solved by:
412 #Internals::SetReadWrite($foo);
413 #Scalar::Util::weaken ($foo);
414 #Internals::SetReadOnly($foo);
416 # but requires XS and is just too damn crazy
417 # so simply throw a better exception
418 my $weak_simple = "my \$preserve; Scalar::Util::weaken(${simple})";
419 Moo::_Utils::lt_5_8_3() ? <<"EOC" : $weak_simple;
422 eval { Scalar::Util::weaken($simple); 1 } or do {
423 if( \$@ =~ /Modification of a read-only value attempted/) {
425 Carp::croak( sprintf (
426 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
435 $self->_generate_core_set($me, $name, $spec, $value);
439 sub _generate_getset {
440 my ($self, $name, $spec) = @_;
441 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
442 ."\n : ".$self->_generate_get($name, $spec)."\n )";
445 sub _generate_delegation {
446 my ($self, $asserter, $target, $args) = @_;
447 my $arg_string = do {
449 # I could, I reckon, linearise out non-refs here using perlstring
450 # plus something to check for numbers but I'm unsure if it's worth it
451 $self->{captures}{'@curries'} = $args;
457 "shift->${asserter}->${target}(${arg_string});";
461 my ($self, $type, $into, $name, $slot) = @_;
462 Class::XSAccessor->import(
464 $type => { $name => $slot },
470 sub default_construction_string { '{}' }