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1 | package Role::Tiny; |
2 | |
3 | use strictures 1; |
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4 | use Class::Tiny::_Utils; |
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5 | |
6 | our %INFO; |
7 | our %APPLIED_TO; |
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8 | our %COMPOSED; |
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9 | |
10 | sub import { |
11 | my $target = caller; |
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12 | strictures->import; |
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13 | # get symbol table reference |
14 | my $stash = do { no strict 'refs'; \%{"${target}::"} }; |
15 | # install before/after/around subs |
16 | foreach my $type (qw(before after around)) { |
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17 | *{_getglob "${target}::${type}"} = sub { |
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18 | push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ]; |
19 | }; |
20 | } |
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21 | *{_getglob "${target}::requires"} = sub { |
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22 | push @{$INFO{$target}{requires}||=[]}, @_; |
23 | }; |
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24 | *{_getglob "${target}::with"} = sub { |
25 | die "Only one role supported at a time by with" if @_ > 1; |
26 | Role::Tiny->apply_role_to_package($_[0], $target); |
27 | }; |
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28 | *{_getglob "${target}::has"} = sub { |
29 | my ($name, %spec) = @_; |
30 | ($INFO{$target}{accessor_maker} ||= do { |
31 | require Method::Generate::Accessor; |
32 | Method::Generate::Accessor->new |
33 | })->generate_method($target, $name, \%spec); |
34 | $INFO{$target}{attributes}{$name} = \%spec; |
35 | }; |
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36 | # grab all *non-constant* (ref eq 'SCALAR') subs present |
37 | # in the symbol table and store their refaddrs (no need to forcibly |
38 | # inflate constant subs into real subs) - also add '' to here (this |
39 | # is used later) |
40 | @{$INFO{$target}{not_methods}={}}{ |
41 | '', map { *$_{CODE}||() } grep !(ref eq 'SCALAR'), values %$stash |
42 | } = (); |
43 | # a role does itself |
44 | $APPLIED_TO{$target} = { $target => undef }; |
45 | } |
46 | |
47 | sub apply_role_to_package { |
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48 | my ($me, $role, $to) = @_; |
49 | |
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50 | die "This is apply_role_to_package" if ref($to); |
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51 | die "${role} is not a Role::Tiny" unless my $info = $INFO{$role}; |
52 | |
53 | $me->_check_requires($to, $role, @{$info->{requires}||[]}); |
54 | |
55 | $me->_install_methods($to, $role); |
56 | |
57 | $me->_install_modifiers($to, $info->{modifiers}); |
58 | |
59 | # only add does() method to classes and only if they don't have one |
60 | if (not $INFO{$to} and not $to->can('does')) { |
61 | *{_getglob "${to}::does"} = \&does_role; |
62 | } |
63 | |
64 | $me->_handle_constructor($to, $info->{attributes}); |
65 | |
66 | # copy our role list into the target's |
67 | @{$APPLIED_TO{$to}||={}}{keys %{$APPLIED_TO{$role}}} = (); |
68 | } |
69 | |
70 | sub apply_roles_to_object { |
71 | my ($me, $object, @roles) = @_; |
72 | die "No roles supplied!" unless @roles; |
73 | my $class = ref($object); |
74 | bless($object, $me->create_class_with_roles($class, @roles)); |
75 | $object; |
76 | } |
77 | |
78 | sub create_class_with_roles { |
79 | my ($me, $superclass, @roles) = @_; |
80 | |
81 | my $new_name = join('+', $superclass, my $compose_name = join '+', @roles); |
82 | return $new_name if $COMPOSED{class}{$new_name}; |
83 | |
84 | foreach my $role (@roles) { |
85 | die "${role} is not a Role::Tiny" unless my $info = $INFO{$role}; |
86 | } |
87 | |
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88 | require Class::Tiny::_mro; |
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89 | require Sub::Quote; |
90 | |
91 | my @composable = map $me->_composable_package_for($_), reverse @roles; |
92 | |
93 | *{_getglob("${new_name}::ISA")} = [ @composable, $superclass ]; |
94 | |
95 | my @info = map +($INFO{$_} ? $INFO{$_} : ()), @roles; |
96 | |
97 | $me->_check_requires( |
98 | $new_name, $compose_name, |
99 | do { my %h; @h{map @{$_->{requires}||[]}, @info} = (); keys %h } |
100 | ); |
101 | $me->_handle_constructor( |
102 | $new_name, { map %{$_->{attr_info}||{}}, @info } |
103 | ); |
104 | |
105 | *{_getglob "${new_name}::does"} = \&does_role unless $new_name->can('does'); |
106 | |
107 | @{$APPLIED_TO{$new_name}||={}}{ |
108 | map keys %{$APPLIED_TO{$_}}, @roles |
109 | } = (); |
110 | |
111 | $COMPOSED{class}{$new_name} = 1; |
112 | return $new_name; |
113 | } |
114 | |
115 | sub _composable_package_for { |
116 | my ($me, $role) = @_; |
117 | my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role; |
118 | return $composed_name if $COMPOSED{role}{$composed_name}; |
119 | $me->_install_methods($composed_name, $role); |
120 | my $base_name = $composed_name.'::_BASE'; |
121 | *{_getglob("${composed_name}::ISA")} = [ $base_name ]; |
122 | my $modifiers = $INFO{$role}{modifiers}||[]; |
123 | foreach my $modified ( |
124 | do { my %h; @h{map $_->[1], @$modifiers} = (); keys %h } |
125 | ) { |
126 | Sub::Quote::quote_sub( |
127 | "${base_name}::${modified}" => q{ shift->next::method(@_) } |
128 | ); |
129 | } |
130 | $me->_install_modifiers($composed_name, $modifiers); |
131 | $COMPOSED{role}{$composed_name} = 1; |
132 | return $composed_name; |
133 | } |
134 | |
135 | sub _check_requires { |
136 | my ($me, $to, $name, @requires) = @_; |
137 | if (my @requires_fail = grep !$to->can($_), @requires) { |
138 | # role -> role, add to requires, role -> class, error out |
139 | if (my $to_info = $INFO{$to}) { |
140 | push @{$to_info->{requires}||=[]}, @requires_fail; |
141 | } else { |
142 | die "Can't apply ${name} to ${to} - missing ".join(', ', @requires_fail); |
143 | } |
144 | } |
145 | } |
146 | |
147 | sub _install_methods { |
148 | my ($me, $to, $role) = @_; |
149 | |
150 | my $info = $INFO{$role}; |
151 | |
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152 | my $methods = $info->{methods} ||= do { |
153 | # grab role symbol table |
154 | my $stash = do { no strict 'refs'; \%{"${role}::"}}; |
155 | my $not_methods = $info->{not_methods}; |
156 | +{ |
157 | # grab all code entries that aren't in the not_methods list |
158 | map { |
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159 | my $code = *{$stash->{$_}}{CODE}; |
160 | # rely on the '' key we added in import for "no code here" |
161 | exists $not_methods->{$code||''} ? () : ($_ => $code) |
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162 | } grep !(ref($stash->{$_}) eq 'SCALAR'), keys %$stash |
163 | }; |
164 | }; |
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165 | |
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166 | # grab target symbol table |
167 | my $stash = do { no strict 'refs'; \%{"${to}::"}}; |
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168 | |
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169 | # determine already extant methods of target |
170 | my %has_methods; |
171 | @has_methods{grep |
172 | +((ref($stash->{$_}) eq 'SCALAR') || (*{$stash->{$_}}{CODE})), |
173 | keys %$stash |
174 | } = (); |
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175 | |
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176 | foreach my $i (grep !exists $has_methods{$_}, keys %$methods) { |
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177 | no warnings 'once'; |
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178 | *{_getglob "${to}::${i}"} = $methods->{$i}; |
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179 | } |
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180 | } |
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181 | |
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182 | sub _install_modifiers { |
183 | my ($me, $to, $modifiers) = @_; |
184 | foreach my $modifier (@{$modifiers||[]}) { |
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185 | _install_modifier($to, @{$modifier}); |
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186 | } |
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187 | } |
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188 | |
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189 | sub _handle_constructor { |
190 | my ($me, $to, $attr_info) = @_; |
191 | return unless $attr_info && keys %$attr_info; |
192 | if ($INFO{$to}) { |
193 | @{$INFO{$to}{attributes}||={}}{keys %$attr_info} = values %$attr_info; |
194 | } else { |
195 | # only fiddle with the constructor if the target is a Class::Tiny class |
196 | if ($INC{"Class/Tiny.pm"} |
197 | and my $con = Class::Tiny->_constructor_maker_for($to)) { |
198 | $con->register_attribute_specs(%$attr_info); |
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199 | } |
200 | } |
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201 | } |
202 | |
203 | sub does_role { |
204 | my ($package, $role) = @_; |
205 | return exists $APPLIED_TO{$package}{$role}; |
206 | } |
207 | |
208 | 1; |