package Catalyst::Action; =head1 NAME Catalyst::Action - Catalyst Action =head1 SYNOPSIS
$c->forward( $action->private_path ); =head1 DESCRIPTION This class represents a Catalyst Action. You can access the object for the currently dispatched action via $c->action. See the L for more information on how actions are dispatched. Actions are defined in L subclasses. =cut use Moose; use Scalar::Util 'looks_like_number'; use Moose::Util::TypeConstraints (); with 'MooseX::Emulate::Class::Accessor::Fast'; use namespace::clean -except => 'meta'; has class => (is => 'rw'); has namespace => (is => 'rw'); has 'reverse' => (is => 'rw'); has attributes => (is => 'rw'); has name => (is => 'rw'); has code => (is => 'rw'); has private_path => ( reader => 'private_path', isa => 'Str', lazy => 1, required => 1, default => sub { '/'.shift->reverse }, ); has number_of_args => ( is=>'ro', init_arg=>undef, isa=>'Int|Undef', required=>1, lazy=>1, builder=>'_build_number_of_args'); sub _build_number_of_args { my $self = shift; if( ! exists $self->attributes->{Args} ) { # When 'Args' does not exist, that means we want 'any number of args'. return undef; } elsif(!defined($self->attributes->{Args}[0])) { # When its 'Args' that internal cue for 'unlimited' return undef; } elsif( scalar(@{$self->attributes->{Args}}) == 1 && looks_like_number($self->attributes->{Args}[0]) ) { # 'Old school' numbered args (is allowed to be undef as well) return $self->attributes->{Args}[0]; } else { # New hotness named arg constraints return $self->number_of_args_constraints; } } sub normalized_arg_number { return defined($_[0]->number_of_args) ? $_[0]->number_of_args : ~0; } has number_of_args_constraints => ( is=>'ro', isa=>'Int|Undef', init_arg=>undef, required=>1, lazy=>1, builder=>'_build_number_of_args_constraints'); sub _build_number_of_args_constraints { my $self = shift; return unless $self->has_args_constraints; my $total = 0; foreach my $tc( @{$self->args_constraints}) { if($tc->is_a_type_of('Ref')) { if($tc->can('parameters') && $tc->has_parameters) { my $total_params = scalar(@{ $tc->parameters||[] }); $total = $total + $total_params; } else { # Its a Reftype but we don't know the number of params it # actually validates. return undef; } } else { $total++; } } return $total; } has args_constraints => ( is=>'ro', init_arg=>undef, traits=>['Array'], isa=>'ArrayRef', required=>1, lazy=>1, builder=>'_build_args_constraints', handles => { has_args_constraints => 'count', args_constraint_count => 'count', }); sub _build_args_constraints { my $self = shift; my @arg_protos = @{$self->attributes->{Args}||[]}; return [] unless scalar(@arg_protos); return [] unless defined($arg_protos[0]); # If there is only one arg and it looks like a number # we assume its 'classic' and the number is the number of # constraints. my @args = (); if( scalar(@arg_protos) == 1 && looks_like_number($arg_protos[0]) ) { return \@args; } else { @args = map { my @tc = $self->resolve_type_constraint($_); scalar(@tc) ? @tc : die "$_ is not a constraint!" } @arg_protos; } return \@args; } has number_of_captures_constraints => ( is=>'ro', isa=>'Int|Undef', init_arg=>undef, required=>1, lazy=>1, builder=>'_build_number_of_capture_constraints'); sub _build_number_of_capture_constraints { my $self = shift; return unless $self->has_captures_constraints; my $total = 0; foreach my $tc( @{$self->captures_constraints}) { if($tc->is_a_type_of('Ref')) { if($tc->can('parameters') && $tc->has_parameters) { my $total_params = scalar(@{ $tc->parameters||[] }); $total = $total + $total_params; } else { # Its a Reftype but we don't know the number of params it # actually validates. This is not currently permitted in # a capture... die "You cannot use CaptureArgs($tc) in ${\$self->reverse} because we cannot determined the number of its parameters"; } } else { $total++; } } return $total; } has captures_constraints => ( is=>'ro', init_arg=>undef, traits=>['Array'], isa=>'ArrayRef', required=>1, lazy=>1, builder=>'_build_captures_constraints', handles => { has_captures_constraints => 'count', captures_constraints_count => 'count', }); sub _build_captures_constraints { my $self = shift; my @arg_protos = @{$self->attributes->{CaptureArgs}||[]}; return [] unless scalar(@arg_protos); return [] unless defined($arg_protos[0]); # If there is only one arg and it looks like a number # we assume its 'classic' and the number is the number of # constraints. my @args = (); if( scalar(@arg_protos) == 1 && looks_like_number($arg_protos[0]) ) { return \@args; } else { @args = map { my @tc = $self->resolve_type_constraint($_); scalar(@tc) ? @tc : die "$_ is not a constraint!" } @arg_protos; } return \@args; } sub resolve_type_constraint { my ($self, $name) = @_; my @tc = eval "package ${\$self->class}; $name"; return @tc if $tc[0]; return Moose::Util::TypeConstraints::find_or_parse_type_constraint($name); } has number_of_captures => ( is=>'ro', init_arg=>undef, isa=>'Int', required=>1, lazy=>1, builder=>'_build_number_of_captures'); sub _build_number_of_captures { my $self = shift; if( ! exists $self->attributes->{CaptureArgs} ) { # If there are no defined capture args, thats considered 0. return 0; } elsif(!defined($self->attributes->{CaptureArgs}[0])) { # If you fail to give a defined value, that's also 0 return 0; } elsif( scalar(@{$self->attributes->{CaptureArgs}}) == 1 && looks_like_number($self->attributes->{CaptureArgs}[0]) ) { # 'Old school' numbered captures return $self->attributes->{CaptureArgs}[0]; } else { # New hotness named arg constraints return $self->number_of_captures_constraints; } } use overload ( # Stringify to reverse for debug output etc. q{""} => sub { shift->{reverse} }, # Codulate to execute to invoke the encapsulated action coderef '&{}' => sub { my $self = shift; sub { $self->execute(@_); }; }, # Make general $stuff still work fallback => 1, ); no warnings 'recursion'; sub dispatch { # Execute ourselves against a context my ( $self, $c ) = @_; return $c->execute( $self->class, $self ); } sub execute { my $self = shift; $self->code->(@_); } sub match { my ( $self, $c ) = @_; return $self->match_args($c, $c->req->args); } sub match_args { my ($self, $c, $args) = @_; my @args = @{$args||[]}; # If infinite args, we always match return 1 if $self->normalized_arg_number == ~0; # There there are arg constraints, we must see to it that the constraints # check positive for each arg in the list. if($self->has_args_constraints) { # If there is only one type constraint, and its a Ref or subtype of Ref, # That means we expect a reference, so use the full args arrayref. if( $self->args_constraint_count == 1 && ( $self->args_constraints->[0]->is_a_type_of('Ref') || $self->args_constraints->[0]->is_a_type_of('ClassName') ) ) { return $self->args_constraints->[0]->check($args); # Removing coercion stuff for the first go #if($self->args_constraints->[0]->coercion && $self->attributes->{Coerce}) { # my $coerced = $self->args_constraints->[0]->coerce($c) || return 0; # $c->req->args([$coerced]); # return 1; #} } else { # Because of the way chaining works, we can expect args that are totally not # what you'd expect length wise. When they don't match length, thats a fail return 0 unless scalar( @args ) == $self->normalized_arg_number; for my $i(0..$#args) { $self->args_constraints->[$i]->check($args[$i]) || return 0; } return 1; } } else { # Otherwise, we just need to match the number of args. return scalar( @args ) == $self->normalized_arg_number; } } sub match_captures { my ($self, $c, $captures) = @_; my @captures = @{$captures||[]}; return 1 unless scalar(@captures); # If none, just say its ok if($self->has_captures_constraints) { if( $self->captures_constraints_count == 1 && ( $self->captures_constraints->[0]->is_a_type_of('Ref') || $self->captures_constraints->[0]->is_a_type_of('ClassName') ) ) { return $self->captures_constraints->[0]->check($captures); } else { for my $i(0..$#captures) { $self->captures_constraints->[$i]->check($captures[$i]) || return 0; } return 1; } } else { return 1; } return 1; } sub compare { my ($a1, $a2) = @_; return $a1->normalized_arg_number <=> $a2->normalized_arg_number; } sub scheme { return exists $_[0]->attributes->{Scheme} ? $_[0]->attributes->{Scheme}[0] : undef; } sub list_extra_info { my $self = shift; return { Args => $self->normalized_arg_number, CaptureArgs => $self->number_of_captures, } } __PACKAGE__->meta->make_immutable; 1; __END__ =head1 METHODS =head2 attributes The sub attributes that are set for this action, like Local, Path, Private and so on. This determines how the action is dispatched to. =head2 class Returns the name of the component where this action is defined. Derived by calling the L method on each component. =head2 code Returns a code reference to this action. =head2 dispatch( $c ) Dispatch this action against a context. =head2 execute( $controller, $c, @args ) Execute this action's coderef against a given controller with a given context and arguments =head2 match( $c ) Check Args attribute, and makes sure number of args matches the setting. Always returns true if Args is omitted. =head2 match_captures ($c, $captures) Can be implemented by action class and action role authors. If the method exists, then it will be called with the request context and an array reference of the captures for this action. Returning true from this method causes the chain match to continue, returning makes the chain not match (and alternate, less preferred chains will be attempted). =head2 match_args($c, $args) Underlying feature that does the 'match' work, but doesn't require a context to work (like 'match' does.). =head2 resolve_type_constraint Trys to find a type constraint if you have on on a type constrained method. =head2 compare Compares 2 actions based on the value of the C attribute, with no C having the highest precedence. =head2 namespace Returns the private namespace this action lives in. =head2 reverse Returns the private path for this action. =head2 private_path Returns absolute private path for this action. Unlike C, the C of an action is always suitable for passing to C. =head2 name Returns the sub name of this action. =head2 number_of_args Returns the number of args this action expects. This is 0 if the action doesn't take any arguments and undef if it will take any number of arguments. =head2 normalized_arg_number For the purposes of comparison we normalize 'number_of_args' so that if it is undef we mean ~0 (as many args are we can think of). =head2 number_of_captures Returns the number of captures this action expects for L actions. =head2 list_extra_info A HashRef of key-values that an action can provide to a debugging screen =head2 scheme Any defined scheme for the action =head2 meta Provided by Moose. =head1 AUTHORS Catalyst Contributors, see Catalyst.pm =head1 COPYRIGHT This library is free software. You can redistribute it and/or modify it under the same terms as Perl itself. =cut