package Mouse::Meta::TypeConstraint;
use Mouse::Util qw(:meta); # enables strict and warnings
-
-use overload
- 'bool' => sub { 1 }, # always true
-
- '""' => sub { $_[0]->name }, # stringify to tc name
-
- '|' => sub { # or-combination
- require Mouse::Util::TypeConstraints;
- return Mouse::Util::TypeConstraints::find_or_parse_type_constraint(
- "$_[0] | $_[1]",
- );
- },
-
- fallback => 1;
-
-use Carp ();
+use Scalar::Util ();
sub new {
- my($class, %args) = @_;
+ my $class = shift;
+ my %args = @_ == 1 ? %{$_[0]} : @_;
$args{name} = '__ANON__' if !defined $args{name};
$check = $args{constraint};
if(defined($check) && ref($check) ne 'CODE'){
- Carp::confess("Constraint for $args{name} is not a CODE reference");
+ $class->throw_error(
+ "Constraint for $args{name} is not a CODE reference");
}
my $self = bless \%args, $class;
- $self->compile_type_constraint() if !$self->{hand_optimized_type_constraint};
+ $self->compile_type_constraint()
+ if !$self->{hand_optimized_type_constraint};
$self->_compile_union_type_coercion() if $self->{type_constraints};
return $self;
sub create_child_type{
my $self = shift;
- # XXX: FIXME
return ref($self)->new(
# a child inherits its parent's attributes
%{$self},
- # but does not inherit 'compiled_type_constraint' and 'hand_optimized_type_constraint'
+ # but does not inherit 'compiled_type_constraint'
+ # and 'hand_optimized_type_constraint'
compiled_type_constraint => undef,
hand_optimized_type_constraint => undef,
sub message;
sub has_coercion;
+sub check;
+
sub type_parameter;
sub __is_parameterized;
sub compile_type_constraint;
-sub _add_type_coercions{
+
+sub _add_type_coercions { # ($self, @pairs)
my $self = shift;
- my $coercions = ($self->{_coercion_map} ||= []);
+ my $coercions = ($self->{coercion_map} ||= []);
my %has = map{ $_->[0] => undef } @{$coercions};
for(my $i = 0; $i < @_; $i++){
my $action = $_[++$i];
if(exists $has{$from}){
- Carp::confess("A coercion action already exists for '$from'");
+ $self->throw_error("A coercion action already exists for '$from'");
}
my $type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint($from)
- or Carp::confess("Could not find the type constraint ($from) to coerce from");
+ or $self->throw_error(
+ "Could not find the type constraint ($from) to coerce from");
push @{$coercions}, [ $type => $action ];
}
# compile
if(exists $self->{type_constraints}){ # union type
- Carp::confess("Cannot add additional type coercions to Union types");
+ $self->throw_error(
+ "Cannot add additional type coercions to Union types");
}
else{
$self->_compile_type_coercion();
sub _compile_type_coercion {
my($self) = @_;
- my @coercions = @{$self->{_coercion_map}};
+ my @coercions = @{$self->{coercion_map}};
$self->{_compiled_type_coercion} = sub {
my($thing) = @_;
return;
}
-sub check {
- my $self = shift;
- return $self->_compiled_type_constraint->(@_);
-}
-
sub coerce {
my $self = shift;
my $coercion = $self->_compiled_type_coercion;
if(!$coercion){
- Carp::confess("Cannot coerce without a type coercion");
+ $self->throw_error("Cannot coerce without a type coercion");
}
- return $_[0] if $self->_compiled_type_constraint->(@_);
+ return $_[0] if $self->check(@_);
return $coercion->(@_);
}
return $msg->($value);
}
else {
- $value = ( defined $value ? overload::StrVal($value) : 'undef' );
- return "Validation failed for '$self' failed with value $value";
+ if(not defined $value) {
+ $value = 'undef';
+ }
+ elsif( ref($value) && defined(&overload::StrVal) ) {
+ $value = overload::StrVal($value);
+ }
+ return "Validation failed for '$self' with value $value";
}
}
return 1 if $self->name eq $other_name;
if(exists $self->{type_constraints}){ # union
- foreach my $type(@{$self->{type_constraints}}){
+ foreach my $type(@{$self->{type_constraints}}) {
return 1 if $type->name eq $other_name;
}
}
- for(my $parent = $self->parent; defined $parent; $parent = $parent->parent){
- return 1 if $parent->name eq $other_name;
+ for(my $p = $self->parent; defined $p; $p = $p->parent) {
+ return 1 if $p->name eq $other_name;
}
return 0;
$name ||= sprintf '%s[%s]', $self->name, $param->name;
my $generator = $self->{constraint_generator}
- || Carp::confess("The $name constraint cannot be used, because $param doesn't subtype from a parameterizable type");
+ || $self->throw_error("The $name constraint cannot be used,"
+ . " because $param doesn't subtype from a parameterizable type");
return Mouse::Meta::TypeConstraint->new(
name => $name,
parent => $self,
type_parameter => $param,
constraint => $generator->($param), # must be 'constraint', not 'optimized'
-
- type => 'Parameterized',
);
}
sub assert_valid {
my ($self, $value) = @_;
- if(!$self->_compiled_type_constraint->($value)){
- Carp::confess($self->get_message($value));
+ if(!$self->check($value)){
+ $self->throw_error($self->get_message($value));
}
return 1;
}
+sub _as_string { $_[0]->name } # overload ""
+sub _identity { Scalar::Util::refaddr($_[0]) } # overload 0+
+
+sub _unite { # overload infix:<|>
+ my($lhs, $rhs) = @_;
+ require Mouse::Util::TypeConstraints;
+ return Mouse::Util::TypeConstraints::find_or_parse_type_constraint(
+ " $lhs | $rhs",
+ );
+}
+
1;
__END__
=head1 VERSION
-This document describes Mouse version 0.50_02
+This document describes Mouse version 0.70
=head1 DESCRIPTION
-For the most part, the only time you will ever encounter an
-instance of this class is if you are doing some serious deep
-introspection. This API should not be considered final, but
-it is B<highly unlikely> that this will matter to a regular
-Mouse user.
-
-Don't use this.
+This class represents a type constraint, including built-in
+type constraints, union type constraints, parameterizable/
+parameterized type constraints, as well as custom type
+constraints
=head1 METHODS
-=over 4
+=over
+
+=item C<< Mouse::Meta::TypeConstraint->new(%options) >>
+
+=item C<< $constraint->name >>
+
+=item C<< $constraint->parent >>
+
+=item C<< $constraint->constraint >>
+
+=item C<< $constraint->has_coercion >>
+
+=item C<< $constraint->message >>
+
+=item C<< $constraint->is_a_subtype_of($name or $object) >>
+
+=item C<< $constraint->coerce($value) >>
+
+=item C<< $constraint->check($value) >>
+
+=item C<< $constraint->assert_valid($value) >>
-=item B<new>
+=item C<< $constraint->get_message($value) >>
-=item B<name>
+=item C<< $constraint->create_child_type(%options) >>
=back
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