package Role::Tiny;
-use strictures 1;
-use Class::Method::Modifiers ();
+use strict;
+use warnings FATAL => 'all';
our %INFO;
our %APPLIED_TO;
+our %COMPOSED;
+
+sub _getglob { no strict 'refs'; \*{$_[0]} }
+
+sub _load_module {
+ return 1 if $_[0]->can('can');
+ (my $proto = $_[0]) =~ s/::/\//g;
+ require "${proto}.pm";
+ return 1;
+}
sub import {
my $target = caller;
+ my $me = $_[0];
+ strictures->import;
# get symbol table reference
my $stash = do { no strict 'refs'; \%{"${target}::"} };
# install before/after/around subs
foreach my $type (qw(before after around)) {
- *{(do { no strict 'refs'; \*{"${target}::${type}"}})} = sub {
+ *{_getglob "${target}::${type}"} = sub {
+ require Class::Method::Modifiers;
push @{$INFO{$target}{modifiers}||=[]}, [ $type => @_ ];
};
}
- *{(do { no strict 'refs'; \*{"${target}::requires"}})} = sub {
+ *{_getglob "${target}::requires"} = sub {
push @{$INFO{$target}{requires}||=[]}, @_;
};
+ *{_getglob "${target}::with"} = sub {
+ die "Only one role supported at a time by with" if @_ > 1;
+ $me->apply_role_to_package($_[0], $target);
+ };
# grab all *non-constant* (ref eq 'SCALAR') subs present
# in the symbol table and store their refaddrs (no need to forcibly
# inflate constant subs into real subs) - also add '' to here (this
}
sub apply_role_to_package {
- my ($class, $role, $to) = @_;
+ my ($me, $role, $to) = @_;
+
+ _load_module($role);
+
die "This is apply_role_to_package" if ref($to);
- die "Not a Role::Tiny" unless my $info = $INFO{$role};
- my $methods = $info->{methods} ||= do {
+ die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
+
+ $me->_check_requires($to, $role, @{$info->{requires}||[]});
+
+ $me->_install_methods($to, $role);
+
+ $me->_install_modifiers($to, $info->{modifiers});
+
+ # only add does() method to classes and only if they don't have one
+ if (not $INFO{$to} and not $to->can('does')) {
+ *{_getglob "${to}::does"} = \&does_role;
+ }
+
+ # copy our role list into the target's
+ @{$APPLIED_TO{$to}||={}}{keys %{$APPLIED_TO{$role}}} = ();
+}
+
+sub apply_roles_to_object {
+ my ($me, $object, @roles) = @_;
+ die "No roles supplied!" unless @roles;
+ my $class = ref($object);
+ bless($object, $me->create_class_with_roles($class, @roles));
+ $object;
+}
+
+sub create_class_with_roles {
+ my ($me, $superclass, @roles) = @_;
+
+ die "No roles supplied!" unless @roles;
+
+ my $new_name = join('+', $superclass, my $compose_name = join '+', @roles);
+ return $new_name if $COMPOSED{class}{$new_name};
+
+ foreach my $role (@roles) {
+ _load_module($role);
+ die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
+ }
+
+ if ($] > 5.010) {
+ require mro;
+ } else {
+ require MRO::Compat;
+ }
+
+ my @composable = map $me->_composable_package_for($_), reverse @roles;
+
+ *{_getglob("${new_name}::ISA")} = [ @composable, $superclass ];
+
+ my @info = map +($INFO{$_} ? $INFO{$_} : ()), @roles;
+
+ $me->_check_requires(
+ $new_name, $compose_name,
+ do { my %h; @h{map @{$_->{requires}||[]}, @info} = (); keys %h }
+ );
+
+ *{_getglob "${new_name}::does"} = \&does_role unless $new_name->can('does');
+
+ @{$APPLIED_TO{$new_name}||={}}{
+ map keys %{$APPLIED_TO{$_}}, @roles
+ } = ();
+
+ $COMPOSED{class}{$new_name} = 1;
+ return $new_name;
+}
+
+sub _composable_package_for {
+ my ($me, $role) = @_;
+ my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role;
+ return $composed_name if $COMPOSED{role}{$composed_name};
+ $me->_install_methods($composed_name, $role);
+ my $base_name = $composed_name.'::_BASE';
+ *{_getglob("${composed_name}::ISA")} = [ $base_name ];
+ my $modifiers = $INFO{$role}{modifiers}||[];
+ my @mod_base;
+ foreach my $modified (
+ do { my %h; @h{map $_->[1], @$modifiers} = (); keys %h }
+ ) {
+ push @mod_base, "sub ${modified} { shift->next::method(\@_) }";
+ }
+ eval(my $code = join "\n", "package ${base_name};", @mod_base);
+ die "Evaling failed: $@\nTrying to eval:\n${code}" if $@;
+ $me->_install_modifiers($composed_name, $modifiers);
+ $COMPOSED{role}{$composed_name} = 1;
+ return $composed_name;
+}
+
+sub _check_requires {
+ my ($me, $to, $name, @requires) = @_;
+ if (my @requires_fail = grep !$to->can($_), @requires) {
+ # role -> role, add to requires, role -> class, error out
+ if (my $to_info = $INFO{$to}) {
+ push @{$to_info->{requires}||=[]}, @requires_fail;
+ } else {
+ die "Can't apply ${name} to ${to} - missing ".join(', ', @requires_fail);
+ }
+ }
+}
+
+sub _concrete_methods_of {
+ my ($me, $role) = @_;
+ my $info = $INFO{$role};
+ $info->{methods} ||= do {
# grab role symbol table
my $stash = do { no strict 'refs'; \%{"${role}::"}};
my $not_methods = $info->{not_methods};
+{
# grab all code entries that aren't in the not_methods list
map {
- my $code = *{$stash->{$_}}{CODE};
- # rely on the '' key we added in import for "no code here"
- exists $not_methods->{$code||''} ? () : ($_ => $code)
+ my $code = *{$stash->{$_}}{CODE};
+ # rely on the '' key we added in import for "no code here"
+ exists $not_methods->{$code||''} ? () : ($_ => $code)
} grep !(ref($stash->{$_}) eq 'SCALAR'), keys %$stash
};
};
+}
+
+sub methods_provided_by {
+ my ($me, $role) = @_;
+ die "${role} is not a Role::Tiny" unless my $info = $INFO{$role};
+ (keys %{$me->_concrete_methods_of($role)}, @{$info->{requires}||[]});
+}
+
+sub _install_methods {
+ my ($me, $to, $role) = @_;
+
+ my $info = $INFO{$role};
+
+ my $methods = $me->_concrete_methods_of($role);
+
# grab target symbol table
my $stash = do { no strict 'refs'; \%{"${to}::"}};
+
# determine already extant methods of target
my %has_methods;
@has_methods{grep
+((ref($stash->{$_}) eq 'SCALAR') || (*{$stash->{$_}}{CODE})),
keys %$stash
} = ();
- if (my @requires_fail
- = grep !exists $has_methods{$_}, @{$info->{requires}||[]}) {
- # role -> role, add to requires, role -> class, error out
- if (my $to_info = $INFO{$to}) {
- push @{$to_info->{requires}||=[]}, @requires_fail;
- } else {
- die "Can't apply ${role} to ${to} - missing ".join(', ', @requires_fail);
- }
- }
- my @to_install = grep !exists $has_methods{$_}, keys %$methods;
- foreach my $i (@to_install) {
+ foreach my $i (grep !exists $has_methods{$_}, keys %$methods) {
no warnings 'once';
- *{(do { no strict 'refs'; \*{"${to}::$i"}})}
- = $methods->{$i};
+ *{_getglob "${to}::${i}"} = $methods->{$i};
}
+}
- foreach my $modifier (@{$info->{modifiers}||[]}) {
- Class::Method::Modifiers::install_modifier($to, @{$modifier});
+sub _install_modifiers {
+ my ($me, $to, $modifiers) = @_;
+ if (my $info = $INFO{$to}) {
+ push @{$info->{modifiers}}, @{$modifiers||[]};
+ } else {
+ foreach my $modifier (@{$modifiers||[]}) {
+ $me->_install_single_modifier($to, @$modifier);
+ }
}
+}
- # copy our role list into the target's
- @{$APPLIED_TO{$to}||={}}{keys %{$APPLIED_TO{$role}}} = ();
+sub _install_single_modifier {
+ my ($me, @args) = @_;
+ Class::Method::Modifiers::install_modifier(@args);
}
sub does_role {
projects / gitmo/Role-Tiny.git / blobdiff