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
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
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
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)."\n"
102 if (my $cl = $spec->{clearer}) {
104 quote_sub "${into}::${cl}" =>
105 " delete \$_[0]->{${\perlstring $name}}\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]', $name);
169 if ($self->is_simple_get($name, $spec)) {
172 'do { '.$self->_generate_use_default(
173 '$_[0]', $name, $spec,
174 $self->_generate_simple_has('$_[0]', $name),
179 sub _generate_simple_has {
180 my ($self, $me, $name) = @_;
181 "exists ${me}->{${\perlstring $name}}";
184 sub generate_get_default {
186 $self->{captures} = {};
187 my $code = $self->_generate_get_default(@_);
188 ($code, delete $self->{captures});
191 sub _generate_use_default {
192 my ($self, $me, $name, $spec, $test) = @_;
193 my $get_value = $self->_generate_get_default($me, $name, $spec);
194 if ($spec->{coerce}) {
195 $get_value = $self->_generate_coerce(
200 $self->_generate_simple_set(
201 $me, $name, $spec, $get_value
205 sub _generate_get_default {
206 my ($self, $me, $name, $spec) = @_;
208 ? $self->_generate_call_code($name, 'default', $me, $spec->{default})
209 : "${me}->${\$spec->{builder}}"
212 sub generate_simple_get {
213 my ($self, @args) = @_;
214 $self->_generate_simple_get(@args);
217 sub _generate_simple_get {
218 my ($self, $me, $name) = @_;
219 my $name_str = perlstring $name;
220 "${me}->{${name_str}}";
224 my ($self, $name, $spec) = @_;
225 if ($self->is_simple_set($name, $spec)) {
226 $self->_generate_simple_set('$_[0]', $name, $spec, '$_[1]');
228 my ($coerce, $trigger, $isa_check) = @{$spec}{qw(coerce trigger isa)};
229 my $simple = $self->_generate_simple_set('$self', $name, $spec, '$value');
230 my $code = "do { my (\$self, \$value) = \@_;\n";
234 .$self->_generate_coerce($name, '$value', $coerce).";\n";
238 " ".$self->_generate_isa_check($name, '$value', $isa_check).";\n";
241 my $fire = $self->_generate_trigger($name, '$self', '$value', $trigger);
243 " ".$simple.";\n ".$fire.";\n"
246 $code .= " ".$simple.";\n";
253 sub generate_coerce {
255 $self->{captures} = {};
256 my $code = $self->_generate_coerce(@_);
257 ($code, delete $self->{captures});
260 sub _generate_coerce {
261 my ($self, $name, $value, $coerce) = @_;
262 $self->_generate_call_code($name, 'coerce', "${value}", $coerce);
265 sub generate_trigger {
267 $self->{captures} = {};
268 my $code = $self->_generate_trigger(@_);
269 ($code, delete $self->{captures});
272 sub _generate_trigger {
273 my ($self, $name, $obj, $value, $trigger) = @_;
274 $self->_generate_call_code($name, 'trigger', "${obj}, ${value}", $trigger);
277 sub generate_isa_check {
278 my ($self, @args) = @_;
279 $self->{captures} = {};
280 my $code = $self->_generate_isa_check(@args);
281 ($code, delete $self->{captures});
284 sub _generate_isa_check {
285 my ($self, $name, $value, $check) = @_;
286 $self->_generate_call_code($name, 'isa_check', $value, $check);
289 sub _generate_call_code {
290 my ($self, $name, $type, $values, $sub) = @_;
291 if (my $quoted = quoted_from_sub($sub)) {
292 my $code = $quoted->[1];
293 my $at_ = '@_ = ('.$values.');';
294 if (my $captures = $quoted->[2]) {
295 my $cap_name = qq{\$${type}_captures_for_${name}};
296 $self->{captures}->{$cap_name} = \$captures;
297 Sub::Quote::inlinify(
298 $code, $values, Sub::Quote::capture_unroll($cap_name, $captures, 6)
301 Sub::Quote::inlinify($code, $values);
304 my $cap_name = qq{\$${type}_for_${name}};
305 $self->{captures}->{$cap_name} = \$sub;
306 "${cap_name}->(${values})";
310 sub generate_populate_set {
312 $self->{captures} = {};
313 my $code = $self->_generate_populate_set(@_);
314 ($code, delete $self->{captures});
317 sub _generate_populate_set {
318 my ($self, $me, $name, $spec, $source, $test) = @_;
319 if ($self->has_eager_default($name, $spec)) {
320 my $get_indent = ' ' x ($spec->{isa} ? 6 : 4);
321 my $get_default = $self->_generate_get_default(
325 defined($spec->{init_arg})
326 ? "(\n${get_indent} ${test}\n${get_indent} ? ${source}\n${get_indent} : "
330 if ($spec->{coerce}) {
331 $get_value = $self->_generate_coerce(
337 ? " {\n my \$value = ".$get_value.";\n "
338 .$self->_generate_isa_check(
339 $name, '$value', $spec->{isa}
341 .' '.$self->_generate_simple_set($me, $name, $spec, '$value').";\n"
343 : ' '.$self->_generate_simple_set($me, $name, $spec, $get_value).";\n"
347 .$self->_generate_trigger(
348 $name, $me, $self->_generate_simple_get($me, $name),
357 .$self->_generate_coerce(
365 .$self->_generate_isa_check(
366 $name, $source, $spec->{isa}
370 ." ".$self->_generate_simple_set($me, $name, $spec, $source).";\n"
373 .$self->_generate_trigger(
374 $name, $me, $self->_generate_simple_get($me, $name),
383 sub generate_multi_set {
384 my ($self, $me, $to_set, $from) = @_;
385 "\@{${me}}{qw(${\join ' ', @$to_set})} = $from";
388 sub _generate_simple_set {
389 my ($self, $me, $name, $spec, $value) = @_;
390 my $name_str = perlstring $name;
391 my $simple = "${me}->{${name_str}} = ${value}";
393 if ($spec->{weak_ref}) {
394 require Scalar::Util;
396 # Perl < 5.8.3 can't weaken refs to readonly vars
397 # (e.g. string constants). This *can* be solved by:
399 #Internals::SetReadWrite($foo);
400 #Scalar::Util::weaken ($foo);
401 #Internals::SetReadOnly($foo);
403 # but requires XS and is just too damn crazy
404 # so simply throw a better exception
405 Moo::_Utils::lt_5_8_3() ? <<"EOC" : "Scalar::Util::weaken(${simple})";
407 eval { Scalar::Util::weaken($simple); 1 } or do {
408 if( \$@ =~ /Modification of a read-only value attempted/) {
410 Carp::croak( sprintf (
411 'Reference to readonly value in "%s" can not be weakened on Perl < 5.8.3',
424 sub _generate_getset {
425 my ($self, $name, $spec) = @_;
426 q{(@_ > 1}."\n ? ".$self->_generate_set($name, $spec)
427 ."\n : ".$self->_generate_get($name, $spec)."\n )";
430 sub _generate_delegation {
431 my ($self, $asserter, $target, $args) = @_;
432 my $arg_string = do {
434 # I could, I reckon, linearise out non-refs here using perlstring
435 # plus something to check for numbers but I'm unsure if it's worth it
436 $self->{captures}{'@curries'} = $args;
442 "shift->${asserter}->${target}(${arg_string});";
446 my ($self, $type, $into, $name, $slot) = @_;
447 Class::XSAccessor->import(
449 $type => { $name => $slot }