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1 | package Method::Generate::Constructor; |
2 | |
3 | use strictures 1; |
4 | use Sub::Quote; |
5 | use base qw(Class::Tiny::Object); |
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6 | use Sub::Defer; |
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7 | |
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8 | sub register_attribute_specs { |
9 | my ($self, %spec) = @_; |
10 | @{$self->{attribute_specs}||={}}{keys %spec} = values %spec; |
11 | $self; |
12 | } |
13 | |
14 | sub all_attribute_specs { |
15 | $_[0]->{attribute_specs} |
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16 | } |
17 | |
18 | sub install_delayed { |
19 | my ($self) = @_; |
20 | my $package = $self->{package}; |
21 | defer_sub "${package}::new" => sub { |
22 | unquote_sub $self->generate_method( |
23 | $package, 'new', $self->{attribute_specs}, { no_install => 1 } |
24 | ) |
25 | }; |
26 | $self; |
27 | } |
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28 | |
29 | sub generate_method { |
30 | my ($self, $into, $name, $spec, $quote_opts) = @_; |
31 | foreach my $no_init (grep !exists($spec->{$_}{init_arg}), keys %$spec) { |
32 | $spec->{$no_init}{init_arg} = $no_init; |
33 | } |
34 | my $body = ' my $class = shift;'."\n"; |
35 | $body .= $self->_generate_args; |
36 | $body .= $self->_check_required($spec); |
37 | $body .= ' my $new = bless({}, $class);'."\n"; |
38 | $body .= $self->_assign_new($spec); |
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39 | $body .= ' return $new;'."\n"; |
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40 | quote_sub |
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41 | "${into}::${name}" => $body, |
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42 | (ref($quote_opts) ? ({}, $quote_opts) : ()) |
43 | ; |
44 | } |
45 | |
46 | sub _generate_args { |
47 | my ($self) = @_; |
48 | q{ my $args = ref($_[0]) eq 'HASH' ? $_[0] : { @_ };}."\n"; |
49 | } |
50 | |
51 | sub _assign_new { |
52 | my ($self, $spec) = @_; |
53 | my (@init, @slots); |
54 | NAME: foreach my $name (keys %$spec) { |
55 | my $attr_spec = $spec->{$name}; |
56 | push @init, do { |
57 | next NAME unless defined(my $i = $attr_spec->{init_arg}); |
58 | $i; |
59 | }; |
60 | push @slots, $name; |
61 | } |
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62 | return '' unless @init; |
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63 | ' @{$new}{qw('.join(' ',@slots).')} = @{$args}{qw('.join(' ',@init).')};' |
64 | ."\n"; |
65 | } |
66 | |
67 | sub _check_required { |
68 | my ($self, $spec) = @_; |
69 | my @required_init = |
70 | map $spec->{$_}{init_arg}, |
71 | grep $spec->{$_}{required}, |
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72 | keys %$spec; |
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73 | return '' unless @required_init; |
74 | ' if (my @missing = grep !exists $args->{$_}, qw(' |
75 | .join(' ',@required_init).')) {'."\n" |
76 | .q{ die "Missing required arguments: ".join(', ', sort @missing);}."\n" |
77 | ." }\n"; |
78 | } |
79 | |
80 | 1; |