NAME

Type::Tiny::Enum - string enum type constraints

STATUS

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

DESCRIPTION

Enum type constraints.

This package inherits from Type::Tiny; see that for most documentation. Major differences are listed below:

Attributes

"values": Arrayref of allowable value strings. Non-string values (e.g. objects with overloading) will be stringified in the constructor.
"constraint": Unlike Type::Tiny, you cannot pass a constraint coderef to the constructor. Instead rely on the default.
"inlined": Unlike Type::Tiny, you cannot pass an inlining coderef to the constructor. Instead rely on the default.
"parent": Parent is always Types::Standard::Str, and cannot be passed to the constructor.
"unique_values": The list of "values" but sorted and with duplicates removed. This cannot be passed to the constructor.
"coercion": If "coercion => 1" is passed to the constructor, the type will have a coercion using the "closest_match" method.

Methods

"as_regexp"

Returns the enum as a regexp which strings can be checked against. If you're checking a lot of strings, then using this regexp might be faster than checking each string against

  my $enum  = Type::Tiny::Enum->new(...);
  my $check = $enum->compiled_check;
  my $re    = $enum->as_regexp;
  
  # fast
  my @valid_tokens = grep $enum->check($_), @all_tokens;
  
  # faster
  my @valid_tokens = grep $check->($_), @all_tokens;
  
  # fastest
  my @valid_tokens = grep /$re/, @all_tokens;

You can get a case-insensitive regexp using "$enum->as_regexp('i')".

"closest_match"

Returns the closest match in the enum for a string.

  my $enum = Type::Tiny::Enum->new(
    values => [ qw( foo bar baz quux ) ],
  );
  
  say $enum->closest_match("FO");   # ==> foo

It will try to find an exact match first, fall back to a case-insensitive match, if it still can't find one, will try to find a head substring match, and finally, if given an integer, will use that as an index.

  my $enum = Type::Tiny::Enum->new(
    values => [ qw( foo bar baz quux ) ],
  );
  
  say $enum->closest_match(  0 );  # ==> foo
  say $enum->closest_match(  1 );  # ==> bar
  say $enum->closest_match(  2 );  # ==> baz
  say $enum->closest_match( -1 );  # ==> quux

Overloading

•: Arrayrefification calls "values".

BUGS

Please report any bugs to <https://github.com/tobyink/p5-type-tiny/issues>.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

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.