Commit | Line | Data |
ab3370e7 |
1 | package Role::Tiny; |
2 | |
3 | use strictures 1; |
6c74d087 |
4 | use Class::Tiny::_Utils; |
ab3370e7 |
5 | |
6 | our %INFO; |
7 | our %APPLIED_TO; |
8 | |
9 | sub import { |
10 | my $target = caller; |
de3d4906 |
11 | strictures->import; |
ab3370e7 |
12 | # get symbol table reference |
13 | my $stash = do { no strict 'refs'; \%{"${target}::"} }; |
14 | # install before/after/around subs |
15 | foreach my $type (qw(before after around)) { |
5a247406 |
16 | *{_getglob "${target}::${type}"} = sub { |
ab3370e7 |
17 | push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ]; |
18 | }; |
19 | } |
5a247406 |
20 | *{_getglob "${target}::requires"} = sub { |
ab3370e7 |
21 | push @{$INFO{$target}{requires}||=[]}, @_; |
22 | }; |
5a247406 |
23 | *{_getglob "${target}::with"} = sub { |
24 | die "Only one role supported at a time by with" if @_ > 1; |
25 | Role::Tiny->apply_role_to_package($_[0], $target); |
26 | }; |
ab3370e7 |
27 | # grab all *non-constant* (ref eq 'SCALAR') subs present |
28 | # in the symbol table and store their refaddrs (no need to forcibly |
29 | # inflate constant subs into real subs) - also add '' to here (this |
30 | # is used later) |
31 | @{$INFO{$target}{not_methods}={}}{ |
32 | '', map { *$_{CODE}||() } grep !(ref eq 'SCALAR'), values %$stash |
33 | } = (); |
34 | # a role does itself |
35 | $APPLIED_TO{$target} = { $target => undef }; |
36 | } |
37 | |
38 | sub apply_role_to_package { |
39 | my ($class, $role, $to) = @_; |
40 | die "This is apply_role_to_package" if ref($to); |
41 | die "Not a Role::Tiny" unless my $info = $INFO{$role}; |
42 | my $methods = $info->{methods} ||= do { |
43 | # grab role symbol table |
44 | my $stash = do { no strict 'refs'; \%{"${role}::"}}; |
45 | my $not_methods = $info->{not_methods}; |
46 | +{ |
47 | # grab all code entries that aren't in the not_methods list |
48 | map { |
934ea2c1 |
49 | my $code = *{$stash->{$_}}{CODE}; |
50 | # rely on the '' key we added in import for "no code here" |
51 | exists $not_methods->{$code||''} ? () : ($_ => $code) |
ab3370e7 |
52 | } grep !(ref($stash->{$_}) eq 'SCALAR'), keys %$stash |
53 | }; |
54 | }; |
55 | # grab target symbol table |
56 | my $stash = do { no strict 'refs'; \%{"${to}::"}}; |
57 | # determine already extant methods of target |
58 | my %has_methods; |
59 | @has_methods{grep |
60 | +((ref($stash->{$_}) eq 'SCALAR') || (*{$stash->{$_}}{CODE})), |
61 | keys %$stash |
62 | } = (); |
63 | if (my @requires_fail |
934ea2c1 |
64 | = grep !exists $has_methods{$_}, @{$info->{requires}||[]}) { |
ab3370e7 |
65 | # role -> role, add to requires, role -> class, error out |
66 | if (my $to_info = $INFO{$to}) { |
67 | push @{$to_info->{requires}||=[]}, @requires_fail; |
68 | } else { |
69 | die "Can't apply ${role} to ${to} - missing ".join(', ', @requires_fail); |
70 | } |
71 | } |
72 | |
73 | my @to_install = grep !exists $has_methods{$_}, keys %$methods; |
74 | foreach my $i (@to_install) { |
75 | no warnings 'once'; |
5a247406 |
76 | *{_getglob "${to}::${i}"} = $methods->{$i}; |
ab3370e7 |
77 | } |
78 | |
79 | foreach my $modifier (@{$info->{modifiers}||[]}) { |
6c74d087 |
80 | _install_modifier($to, @{$modifier}); |
ab3370e7 |
81 | } |
82 | |
5a247406 |
83 | # only add does() method to classes and only if they don't have one |
84 | if (not $INFO{$to} and not $to->can('does')) { |
85 | ${_getglob "${to}::does"} = \&does_role; |
86 | } |
87 | |
88 | |
ab3370e7 |
89 | # copy our role list into the target's |
90 | @{$APPLIED_TO{$to}||={}}{keys %{$APPLIED_TO{$role}}} = (); |
91 | } |
92 | |
93 | sub does_role { |
94 | my ($package, $role) = @_; |
95 | return exists $APPLIED_TO{$package}{$role}; |
96 | } |
97 | |
98 | 1; |