package Mouse::Util::TypeConstraints;
use strict;
use warnings;
-use base 'Exporter';
+
+use Exporter;
use Carp ();
use Scalar::Util qw/blessed looks_like_number openhandle/;
+use Mouse::Util qw(does_role not_supported);
+use Mouse::Meta::Module; # class_of
+use Mouse::Meta::TypeConstraint;
+
+our @ISA = qw(Exporter);
our @EXPORT = qw(
as where message from via type subtype coerce class_type role_type enum
+ find_type_constraint
);
my %TYPE;
my %COERCE_KEYS;
sub as ($) {
- as => $_[0]
+ return(as => $_[0]);
}
sub where (&) {
- where => $_[0]
+ return(where => $_[0])
}
sub message (&) {
- message => $_[0]
+ return(message => $_[0])
}
-sub from { @_ }
-sub via (&) {
- $_[0]
-}
+sub from { @_ }
+sub via (&) { $_[0] }
-my $optimized_constraints;
-my $optimized_constraints_base;
-{
- no warnings 'uninitialized';
- %TYPE = (
+BEGIN {
+ my %builtins = (
Any => sub { 1 },
Item => sub { 1 },
- Bool => sub {
- !defined($_[0]) || $_[0] eq "" || "$_[0]" eq '1' || "$_[0]" eq '0'
- },
+
+ Bool => sub { $_[0] ? $_[0] eq '1' : 1 },
Undef => sub { !defined($_[0]) },
Defined => sub { defined($_[0]) },
Value => sub { defined($_[0]) && !ref($_[0]) },
Num => sub { !ref($_[0]) && looks_like_number($_[0]) },
Int => sub { defined($_[0]) && !ref($_[0]) && $_[0] =~ /^-?[0-9]+$/ },
Str => sub { defined($_[0]) && !ref($_[0]) },
- ClassName => sub { Mouse::is_class_loaded($_[0]) },
Ref => sub { ref($_[0]) },
ScalarRef => sub { ref($_[0]) eq 'SCALAR' },
},
Object => sub { blessed($_[0]) && blessed($_[0]) ne 'Regexp' },
+
+ ClassName => sub { Mouse::Util::is_class_loaded($_[0]) },
+ RoleName => sub { (Mouse::Util::find_meta($_[0]) || return 0)->isa('Mouse::Meta::Role') },
);
+ while (my ($name, $code) = each %builtins) {
+ $TYPE{$name} = Mouse::Meta::TypeConstraint->new(
+ name => $name,
+ _compiled_type_constraint => $code,
+ );
+ $TYPE_SOURCE{$name} = __PACKAGE__;
+ }
+
sub optimized_constraints { \%TYPE }
- my @TYPE_KEYS = keys %TYPE;
- sub list_all_builtin_type_constraints { @TYPE_KEYS }
- @TYPE_SOURCE{@TYPE_KEYS} = (__PACKAGE__) x @TYPE_KEYS;
+ my @builtins = keys %TYPE;
+ sub list_all_builtin_type_constraints { @builtins }
+
+ sub list_all_type_constraints { keys %TYPE }
}
sub type {
- my $pkg = caller(0);
- my($name, %conf) = @_;
+ my $name;
+ my %conf;
+
+ if(@_ == 1 && ref $_[0]){ # type { where => ... }
+ %conf = %{$_[0]};
+ }
+ elsif(@_ == 2 && ref $_[1]){ # type $name => { where => ... }*
+ $name = $_[0];
+ %conf = %{$_[1]};
+ }
+ elsif(@_ % 2){ # odd number of arguments
+ $name = shift;
+ %conf = @_;
+ }
+ else{
+ %conf = @_;
+ }
+
+ $name = '__ANON__' if !defined $name;
+
+ my $pkg = caller;
+
if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) {
Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg";
+ }
+
+ my $constraint = $conf{where} || do {
+ my $as = delete $conf{as} || 'Any';
+ ($TYPE{$as} ||= _build_type_constraint($as))->{_compiled_type_constraint};
};
- my $constraint = $conf{where} || do { $TYPE{delete $conf{as} || 'Any' } };
+
+ my $tc = Mouse::Meta::TypeConstraint->new(
+ name => $name,
+ _compiled_type_constraint => sub {
+ local $_ = $_[0];
+ return &{$constraint};
+ },
+ );
$TYPE_SOURCE{$name} = $pkg;
- $TYPE{$name} = sub { local $_=$_[0]; $constraint->($_) };
+ $TYPE{$name} = $tc;
+
+ return $tc;
}
sub subtype {
- my $pkg = caller(0);
- my($name, %conf) = @_;
+ my $name;
+ my %conf;
+
+ if(@_ == 1 && ref $_[0]){ # type { where => ... }
+ %conf = %{$_[0]};
+ }
+ elsif(@_ == 2 && ref $_[1]){ # type $name => { where => ... }*
+ $name = $_[0];
+ %conf = %{$_[1]};
+ }
+ elsif(@_ % 2){ # odd number of arguments
+ $name = shift;
+ %conf = @_;
+ }
+ else{
+ %conf = @_;
+ }
+
+ $name = '__ANON__' if !defined $name;
+
+ my $pkg = caller;
+
if ($TYPE{$name} && $TYPE_SOURCE{$name} ne $pkg) {
Carp::croak "The type constraint '$name' has already been created in $TYPE_SOURCE{$name} and cannot be created again in $pkg";
- };
- my $constraint = $conf{where} || do {
- my $as = delete $conf{as} || 'Any';
- if (! exists $TYPE{$as}) { # Perhaps it's a parameterized source?
- Mouse::Meta::Attribute::_build_type_constraint($as);
- }
- $TYPE{$as};
- };
- my $as = $conf{as} || '';
+ }
+
+ my $constraint = delete $conf{where};
+ my $as_constraint = find_or_create_isa_type_constraint(delete $conf{as} || 'Any')
+ ->{_compiled_type_constraint};
+
+ my $tc = Mouse::Meta::TypeConstraint->new(
+ name => $name,
+ _compiled_type_constraint => (
+ $constraint ?
+ sub {
+ local $_ = $_[0];
+ $as_constraint->($_[0]) && $constraint->($_[0])
+ } :
+ sub {
+ local $_ = $_[0];
+ $as_constraint->($_[0]);
+ }
+ ),
+ %conf,
+ );
$TYPE_SOURCE{$name} = $pkg;
+ $TYPE{$name} = $tc;
- if ($as = $TYPE{$as}) {
- $TYPE{$name} = sub { local $_=$_[0]; $as->($_) && $constraint->($_) };
- } else {
- $TYPE{$name} = sub { local $_=$_[0]; $constraint->($_) };
- }
- return $name;
+ return $tc;
}
sub coerce {
- my($name, %conf) = @_;
+ my $name = shift;
Carp::croak "Cannot find type '$name', perhaps you forgot to load it."
unless $TYPE{$name};
$COERCE{$name} = {};
$COERCE_KEYS{$name} = [];
}
- while (my($type, $code) = each %conf) {
+
+ while (my($type, $code) = splice @_, 0, 2) {
Carp::croak "A coercion action already exists for '$type'"
if $COERCE{$name}->{$type};
if (! $TYPE{$type}) {
# looks parameterized
if ($type =~ /^[^\[]+\[.+\]$/) {
- Mouse::Meta::Attribute::_build_type_constraint($type);
+ $TYPE{$type} = _build_type_constraint($type);
} else {
Carp::croak "Could not find the type constraint ($type) to coerce from"
}
push @{ $COERCE_KEYS{$name} }, $type;
$COERCE{$name}->{$type} = $code;
}
+ return;
}
sub class_type {
if ($conf && $conf->{class}) {
# No, you're using this wrong
warn "class_type() should be class_type(ClassName). Perhaps you're looking for subtype $name => as '$conf->{class}'?";
- subtype($name, as => $conf->{class});
- } else {
- subtype(
- $name => where => sub { $_->isa($name) }
+ subtype $name => (as => $conf->{class});
+ }
+ else {
+ subtype $name => (
+ where => sub { blessed($_) && $_->isa($name) },
);
}
}
sub role_type {
my($name, $conf) = @_;
my $role = $conf->{role};
- subtype(
- $name => where => sub {
- return unless defined $_ && ref($_) && $_->isa('Mouse::Object');
- $_->meta->does_role($role);
- }
+ subtype $name => (
+ where => sub { does_role($_, $role) },
);
}
+# this is an original method for Mouse
sub typecast_constraints {
- my($class, $pkg, $type_constraint, $types, $value) = @_;
+ my($class, $pkg, $types, $value) = @_;
+ Carp::croak("wrong arguments count") unless @_ == 4;
local $_;
- for my $type (ref($types) eq 'ARRAY' ? @{ $types } : ( $types )) {
+ for my $type ( split /\|/, $types ) {
next unless $COERCE{$type};
for my $coerce_type (@{ $COERCE_KEYS{$type}}) {
$_ = $value;
- next unless $TYPE{$coerce_type}->($value);
+ next unless $TYPE{$coerce_type}->check($value);
$_ = $value;
$_ = $COERCE{$type}->{$coerce_type}->($value);
- return $_ if $type_constraint->($_);
+ return $_ if $types->check($_);
}
}
return $value;
);
}
+sub _build_type_constraint {
+ my($spec) = @_;
+
+ my $code;
+ $spec =~ s/\s+//g;
+
+ if ($spec =~ /\A (\w+) \[ (.+) \] \z/xms) {
+ # parameterized
+ my $constraint = $1;
+ my $param = $2;
+ my $parent;
+
+ if ($constraint eq 'Maybe') {
+ $parent = _build_type_constraint('Undef');
+ }
+ else {
+ $parent = _build_type_constraint($constraint);
+ }
+ my $child = _build_type_constraint($param);
+ if ($constraint eq 'ArrayRef') {
+ my $code_str =
+ "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" .
+ "sub {\n" .
+ " if (\$parent->check(\$_[0])) {\n" .
+ " foreach my \$e (\@{\$_[0]}) {\n" .
+ " return () unless \$child->check(\$e);\n" .
+ " }\n" .
+ " return 1;\n" .
+ " }\n" .
+ " return ();\n" .
+ "};\n"
+ ;
+ $code = eval $code_str or Carp::confess("Failed to generate inline type constraint: $@");
+ } elsif ($constraint eq 'HashRef') {
+ my $code_str =
+ "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" .
+ "sub {\n" .
+ " if (\$parent->check(\$_[0])) {\n" .
+ " foreach my \$e (values \%{\$_[0]}) {\n" .
+ " return () unless \$child->check(\$e);\n" .
+ " }\n" .
+ " return 1;\n" .
+ " }\n" .
+ " return ();\n" .
+ "};\n"
+ ;
+ $code = eval $code_str or Carp::confess($@);
+ } elsif ($constraint eq 'Maybe') {
+ my $code_str =
+ "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" .
+ "sub {\n" .
+ " return \$child->check(\$_[0]) || \$parent->check(\$_[0]);\n" .
+ "};\n"
+ ;
+ $code = eval $code_str or Carp::confess($@);
+ } else {
+ Carp::confess("Support for parameterized types other than Maybe, ArrayRef or HashRef is not implemented yet");
+ }
+ $TYPE{$spec} = Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec );
+ } else {
+ $code = $TYPE{ $spec };
+ if (! $code) {
+ # is $spec a known role? If so, constrain with 'does' instead of 'isa'
+ require Mouse::Meta::Role;
+ my $check = Mouse::Meta::Role->_metaclass_cache($spec)?
+ 'does' : 'isa';
+ my $code_str =
+ "#line " . __LINE__ . ' "' . __FILE__ . "\"\n" .
+ "sub {\n" .
+ " Scalar::Util::blessed(\$_[0]) && \$_[0]->$check('$spec');\n" .
+ "}"
+ ;
+ $code = eval $code_str or Carp::confess($@);
+ $TYPE{$spec} = Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec );
+ }
+ }
+ return Mouse::Meta::TypeConstraint->new( _compiled_type_constraint => $code, name => $spec );
+}
+
+sub find_type_constraint {
+ my($type) = @_;
+ if(blessed($type) && $type->isa('Mouse::Meta::TypeConstraint')){
+ return $type;
+ }
+ else{
+ return $TYPE{$type};
+ }
+}
+
+sub find_or_create_does_type_constraint{
+ not_supported;
+}
+
+sub find_or_create_isa_type_constraint {
+ my $type_constraint = shift;
+
+ Carp::confess("Got isa => type_constraints, but Mouse does not yet support parameterized types for containers other than ArrayRef and HashRef and Maybe (rt.cpan.org #39795)")
+ if $type_constraint =~ /\A ( [^\[]+ ) \[\.+\] \z/xms &&
+ $1 ne 'ArrayRef' &&
+ $1 ne 'HashRef' &&
+ $1 ne 'Maybe'
+ ;
+
+
+ $type_constraint =~ s/\s+//g;
+
+ my $tc = find_type_constraint($type_constraint);
+ if (!$tc) {
+ my @type_constraints = split /\|/, $type_constraint;
+ if (@type_constraints == 1) {
+ $tc = $TYPE{$type_constraints[0]} ||
+ _build_type_constraint($type_constraints[0]);
+ }
+ else {
+ my @code_list = map {
+ $TYPE{$_} || _build_type_constraint($_)
+ } @type_constraints;
+
+ $tc = Mouse::Meta::TypeConstraint->new(
+ name => $type_constraint,
+
+ _compiled_type_constraint => sub {
+ foreach my $code (@code_list) {
+ return 1 if $code->check($_[0]);
+ }
+ return 0;
+ },
+ );
+ }
+ }
+ return $tc;
+}
+
1;
__END__
=head1 NAME
-Mouse::Util::TypeConstraints - simple type constraints
+Mouse::Util::TypeConstraints - Type constraint system for Mouse
+
+=head2 SYNOPSIS
+
+ use Mouse::Util::TypeConstraints;
+
+ subtype 'Natural'
+ => as 'Int'
+ => where { $_ > 0 };
+
+ subtype 'NaturalLessThanTen'
+ => as 'Natural'
+ => where { $_ < 10 }
+ => message { "This number ($_) is not less than ten!" };
+
+ coerce 'Num'
+ => from 'Str'
+ => via { 0+$_ };
+
+ enum 'RGBColors' => qw(red green blue);
+
+ no Mouse::Util::TypeConstraints;
+
+=head1 DESCRIPTION
+
+This module provides Mouse with the ability to create custom type
+constraints to be used in attribute definition.
+
+=head2 Important Caveat
+
+This is B<NOT> a type system for Perl 5. These are type constraints,
+and they are not used by Mouse unless you tell it to. No type
+inference is performed, expressions are not typed, etc. etc. etc.
+
+A type constraint is at heart a small "check if a value is valid"
+function. A constraint can be associated with an attribute. This
+simplifies parameter validation, and makes your code clearer to read,
+because you can refer to constraints by name.
+
+=head2 Slightly Less Important Caveat
+
+It is B<always> a good idea to quote your type names.
+
+This prevents Perl from trying to execute the call as an indirect
+object call. This can be an issue when you have a subtype with the
+same name as a valid class.
+
+For instance:
+
+ subtype DateTime => as Object => where { $_->isa('DateTime') };
+
+will I<just work>, while this:
+
+ use DateTime;
+ subtype DateTime => as Object => where { $_->isa('DateTime') };
+
+will fail silently and cause many headaches. The simple way to solve
+this, as well as future proof your subtypes from classes which have
+yet to have been created, is to quote the type name:
+
+ use DateTime;
+ subtype 'DateTime' => as 'Object' => where { $_->isa('DateTime') };
+
+=head2 Default Type Constraints
+
+This module also provides a simple hierarchy for Perl 5 types, here is
+that hierarchy represented visually.
+
+ Any
+ Item
+ Bool
+ Maybe[`a]
+ Undef
+ Defined
+ Value
+ Num
+ Int
+ Str
+ ClassName
+ RoleName
+ Ref
+ ScalarRef
+ ArrayRef[`a]
+ HashRef[`a]
+ CodeRef
+ RegexpRef
+ GlobRef
+ FileHandle
+ Object
+ Role
+
+B<NOTE:> Any type followed by a type parameter C<[`a]> can be
+parameterized, this means you can say:
+
+ ArrayRef[Int] # an array of integers
+ HashRef[CodeRef] # a hash of str to CODE ref mappings
+ Maybe[Str] # value may be a string, may be undefined
+
+If Mouse finds a name in brackets that it does not recognize as an
+existing type, it assumes that this is a class name, for example
+C<ArrayRef[DateTime]>.
+
+B<NOTE:> Unless you parameterize a type, then it is invalid to include
+the square brackets. I.e. C<ArrayRef[]> will be treated as a new type
+name, I<not> as a parameterization of C<ArrayRef>.
+
+B<NOTE:> The C<Undef> type constraint for the most part works
+correctly now, but edge cases may still exist, please use it
+sparingly.
+
+B<NOTE:> The C<ClassName> type constraint does a complex package
+existence check. This means that your class B<must> be loaded for this
+type constraint to pass.
+
+B<NOTE:> The C<RoleName> constraint checks a string is a I<package
+name> which is a role, like C<'MyApp::Role::Comparable'>. The C<Role>
+constraint checks that an I<object does> the named role.
+
+=head2 Type Constraint Naming
+
+Type name declared via this module can only contain alphanumeric
+characters, colons (:), and periods (.).
+
+Since the types created by this module are global, it is suggested
+that you namespace your types just as you would namespace your
+modules. So instead of creating a I<Color> type for your
+B<My::Graphics> module, you would call the type
+I<My::Graphics::Types::Color> instead.
+
+=head2 Use with Other Constraint Modules
+
+This module can play nicely with other constraint modules with some
+slight tweaking. The C<where> clause in types is expected to be a
+C<CODE> reference which checks it's first argument and returns a
+boolean. Since most constraint modules work in a similar way, it
+should be simple to adapt them to work with Mouse.
+
+For instance, this is how you could use it with
+L<Declare::Constraints::Simple> to declare a completely new type.
+
+ type 'HashOfArrayOfObjects',
+ {
+ where => IsHashRef(
+ -keys => HasLength,
+ -values => IsArrayRef(IsObject)
+ )
+ };
+
+Here is an example of using L<Test::Deep> and it's non-test
+related C<eq_deeply> function.
+
+ type 'ArrayOfHashOfBarsAndRandomNumbers'
+ => where {
+ eq_deeply($_,
+ array_each(subhashof({
+ bar => isa('Bar'),
+ random_number => ignore()
+ })))
+ };
=head1 METHODS
=over 4
-=item B<subtype 'Name' => as 'Parent' => where { } ...>
+=item C<< subtype 'Name' => as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >>
-=item B<subtype as 'Parent' => where { } ...>
+=item C<< subtype as 'Parent' => where { } ... -> Mouse::Meta::TypeConstraint >>
-=item B<class_type ($class, ?$options)>
+=item C<< class_type ($class, ?$options) -> Mouse::Meta::TypeConstraint >>
-=item B<role_type ($role, ?$options)>
+=item C<< role_type ($role, ?$options) -> Mouse::Meta::TypeConstraint >>
-=item B<enum (\@values)>
+=item C<< enum (\@values) -> Mouse::Meta::TypeConstraint >>
=back
+=over 4
+
+=item C<< find_type_constraint(Type) -> Mouse::Meta::TypeConstraint >>
+
+=back
+
+=head1 THANKS
+
+Much of this documentation was taken from C<Moose::Util::TypeConstraints>
+
+=head1 SEE ALSO
+
+L<Moose::Util::TypeConstraints>
+
=cut
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