man Types::Standard (3): bundled set of built-in types for Type::Tiny

STATUS

This module is covered by the Type-Tiny stability policy.

DESCRIPTION

Type::Tiny bundles a few types which seem to be useful.

Moose-like

The following types are similar to those described in Moose::Util::TypeConstraints.

"Any"

Absolutely any value passes this type constraint (even undef).

"Item"

Essentially the same as "Any". All other type constraints in this library inherit directly or indirectly from "Item".

"Bool"

Values that are reasonable booleans. Accepts 1, 0, the empty string and undef.

"Maybe[`a]"

Given another type constraint, also accepts undef. For example, "Maybe[Int]" accepts all integers plus undef.

"Undef"

Only undef passes this type constraint.

"Defined"

Only undef fails this type constraint.

"Value"

Any defined, non-reference value.

"Str"

Any string.

(The only difference between "Value" and "Str" is that the former accepts typeglobs and vstrings.)

Other customers also bought: "StringLike" from Types::TypeTiny.

"Num"

See "LaxNum" and "StrictNum" below.

"Int"

An integer; that is a string of digits 0 to 9, optionally prefixed with a hyphen-minus character.

"ClassName"

The name of a loaded package. The package must have @ISA or $VERSION defined, or must define at least one sub to be considered a loaded package.

"RoleName"

Like "ClassName", but the package must not define a method called "new". This is subtly different from Moose's type constraint of the same name; let me know if this causes you any problems. (I can't promise I'll change anything though.)

"Ref[`a]"

Any defined reference value, including blessed objects.

Unlike Moose, "Ref" is a parameterized type, allowing Scalar::Util::reftype checks, a la

   Ref["HASH"]  # hashrefs, including blessed hashrefs

"ScalarRef[`a]"

A value where "ref($value) eq "SCALAR" or ref($value) eq "REF"".

If parameterized, the referred value must pass the additional constraint. For example, "ScalarRef[Int]" must be a reference to a scalar which holds an integer value.

"ArrayRef[`a]"

A value where "ref($value) eq "ARRAY"".

If parameterized, the elements of the array must pass the additional constraint. For example, "ArrayRef[Num]" must be a reference to an array of numbers.

Other customers also bought: "ArrayLike" from Types::TypeTiny.

"HashRef[`a]"

A value where "ref($value) eq "HASH"".

If parameterized, the values of the hash must pass the additional constraint. For example, "HashRef[Num]" must be a reference to an hash where the values are numbers. The hash keys are not constrained, but Perl limits them to strings; see "Map" below if you need to further constrain the hash values.

Other customers also bought: "HashLike" from Types::TypeTiny.

"CodeRef"

A value where "ref($value) eq "CODE"".

Other customers also bought: "CodeLike" from Types::TypeTiny.

"RegexpRef"

A value where "ref($value) eq "Regexp"".

"GlobRef"

A value where "ref($value) eq "GLOB"".

"FileHandle"

A file handle.

"Object"

A blessed object.

(This also accepts regexp refs.)

Structured

OK, so I stole some ideas from MooseX::Types::Structured.

"Map[`k, `v]"

Similar to "HashRef" but parameterized with type constraints for both the key and value. The constraint for keys would typically be a subtype of "Str".

"Tuple[...]"

Subtype of "ArrayRef", accepting an list of type constraints for each slot in the array.

"Tuple[Int, HashRef]" would match "[1, {}]" but not "[{}, 1]".

"Dict[...]"

Subtype of "HashRef", accepting an list of type constraints for each slot in the hash.

For example "Dict[name => Str, id => Int]" allows "{ name => "Bob", id => 42 }".

"Optional[`a]"

Used in conjunction with "Dict" and "Tuple" to specify slots that are optional and may be omitted (but not necessarily set to an explicit undef).

"Dict[name => Str, id => Optional[Int]]" allows "{ name => "Bob" }" but not "{ name => "Bob", id => "BOB" }".

Note that any use of "Optional[`a]" outside the context of parameterized "Dict" and "Tuple" type constraints makes little sense, and its behaviour is undefined. (An exception: it is used by Type::Params for a similar purpose to how it's used in "Tuple".)

This module also exports a "slurpy" function, which can be used as follows.

It can cause additional trailing values in a "Tuple" to be slurped into a structure and validated. For example, slurping into an ArrayRef:

   my $type = Tuple[Str, slurpy ArrayRef[Int]];
   
   $type->( ["Hello"] );                # ok
   $type->( ["Hello", 1, 2, 3] );       # ok
   $type->( ["Hello", [1, 2, 3]] );     # not ok

Or into a hashref:

   my $type2 = Tuple[Str, slurpy Map[Int, RegexpRef]];
   
   $type2->( ["Hello"] );                               # ok
   $type2->( ["Hello", 1, qr/one/i, 2, qr/two/] );      # ok

It can cause additional values in a "Dict" to be slurped into a hashref and validated:

   my $type3 = Dict[ values => ArrayRef, slurpy HashRef[Str] ];
   
   $type3->( { values => [] } );                        # ok
   $type3->( { values => [], name => "Foo" } );         # ok
   $type3->( { values => [], name => [] } );            # not ok

In either "Tuple" or "Dict", "slurpy Any" can be used to indicate that additional values are acceptable, but should not be constrained in any way. ("slurpy Any" is an optimized code path.)

Objects

OK, so I stole some ideas from MooX::Types::MooseLike::Base.

"InstanceOf[`a]"

Shortcut for a union of Type::Tiny::Class constraints.

"InstanceOf["Foo", "Bar"]" allows objects blessed into the "Foo" or "Bar" classes, or subclasses of those.

Given no parameters, just equivalent to "Object".

"ConsumerOf[`a]"

Shortcut for an intersection of Type::Tiny::Role constraints.

"ConsumerOf["Foo", "Bar"]" allows objects where "$o->DOES("Foo")" and "$o->DOES("Bar")" both return true.

Given no parameters, just equivalent to "Object".

"HasMethods[`a]"

Shortcut for a Type::Tiny::Duck constraint.

"HasMethods["foo", "bar"]" allows objects where "$o->can("foo")" and "$o->can("bar")" both return true.

Given no parameters, just equivalent to "Object".

There are a few other types exported by this function:

"Overload[`a]"

With no parameters, checks that the value is an overloaded object. Can be given one or more string parameters, which are specific operations to check are overloaded. For example, the following checks for objects which overload addition and subtraction.

   Overload["+", "-"]

"Tied[`a]"

A reference to a tied scalar, array or hash.

Can be parameterized with a type constraint which will be applied to the object returned by the "tied()" function. As a convenience, can also be parameterized with a string, which will be inflated to a Type::Tiny::Class.

   use Types::Standard qw(Tied);
   use Type::Utils qw(class_type);
   
   my $My_Package = class_type { class => "My::Package" };
   
   tie my %h, "My::Package";
   \%h ~~ Tied;                   # true
   \%h ~~ Tied[ $My_Package ];    # true
   \%h ~~ Tied["My::Package"];    # true
   
   tie my $s, "Other::Package";
   \$s ~~ Tied;                   # true
   $s  ~~ Tied;                   # false !!

If you need to check that something is specifically a reference to a tied hash, use an intersection:

   use Types::Standard qw( Tied HashRef );
   
   my $TiedHash = (Tied) & (HashRef);
   
   tie my %h, "My::Package";
   tie my $s, "Other::Package";
   
   \%h ~~ $TiedHash;     # true
   \$s ~~ $TiedHash;     # false

"StrMatch[`a]"

A string that matches a regular expression:

   declare "Distance",
      as StrMatch[ qr{^([0-9]+)\s*(mm|cm|m|km)$} ];

You can optionally provide a type constraint for the array of subexpressions:

   declare "Distance",
      as StrMatch[
         qr{^([0-9]+)\s*(.+)$},
         Tuple[
            Int,
            enum(DistanceUnit => [qw/ mm cm m km /]),
         ],
      ];

"Enum[`a]"

As per MooX::Types::MooseLike::Base:

   has size => (is => "ro", isa => Enum[qw( S M L XL XXL )]);

"OptList"

An arrayref of arrayrefs in the style of Data::OptList output.

"LaxNum", "StrictNum"

In Moose 2.09, the "Num" type constraint implementation was changed from being a wrapper around Scalar::Util's "looks_like_number" function to a stricter regexp (which disallows things like ``-Inf'' and ``Nan'').

Types::Standard provides both implementations. "LaxNum" is measurably faster.

The "Num" type constraint is currently an alias for "LaxNum" unless you set the "PERL_TYPES_STANDARD_STRICTNUM" environment variable to true before loading Types::Standard, in which case it becomes an alias for "StrictNum". The constant "Types::Standard::STRICTNUM" can be used to check if "Num" is being strict.

Most people should probably use "Num" or "StrictNum". Don't explicitly use "LaxNum" unless you specifically need an attribute which will accept things like ``Inf''.

Coercions

None of the types in this type library have any coercions by default. However some standalone coercions may be exported. These can be combined with type constraints using the "plus_coercions" method.

"MkOpt"

A coercion from "ArrayRef", "HashRef" or "Undef" to "OptList". Example usage in a Moose attribute:

   use Types::Standard qw( OptList MkOpt );
   
   has options => (
      is     => "ro",
      isa    => OptList->plus_coercions( MkOpt ),
      coerce => 1,
   );

"Split[`a]"

Split a string on a regexp.

   use Types::Standard qw( ArrayRef Str Split );
   
   has name => (
      is     => "ro",
      isa    => (ArrayRef[Str])->plus_coercions(Split[qr/\s/]),
      coerce => 1,
   );

"Join[`a]"

Join an array of strings with a delimiter.

   use Types::Standard qw( Str Join );
   
   my $FileLines = Str->plus_coercions(Join["\n"]);
   
   has file_contents => (
      is     => "ro",
      isa    => $FileLines,
      coerce => 1,
   );

Constants

"Types::Standard::STRICTNUM": Indicates whether "Num" is an alias for "StrictNum". (It is usually an alias for "LaxNum".)

BUGS

Please report any bugs to <http://rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.

AUTHOR

Toby Inkster <[email protected]>.

COPYRIGHT AND LICENCE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

STATUS

DESCRIPTION

Moose-like

Structured

Objects

More

Coercions

Constants

BUGS

AUTHOR

COPYRIGHT AND LICENCE

DISCLAIMER OF WARRANTIES

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