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>.

SEE ALSO

       Type::Tiny::Manual.

       Type::Tiny.

       Moose::Meta::TypeConstraint::Enum.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

       This software is copyright (c) 2013-2014, 2017-2022 by Toby Inkster.

       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.