TOBYINK / Type-FromSah-0.005 / lib / Type / FromSah.pm 

            

              
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use 5.010001;
use strict;
use warnings;
package Type::FromSah;
our $AUTHORITY = 'cpan:TOBYINK';
our $VERSION   = '0.005';
use Data::Sah qw( gen_validator normalize_schema );
use Type::Tiny;
use Types::Standard qw( Item Optional );
use Exporter::Shiny qw( sah2type );
sub sah2type {
        state $pl = 'Data::Sah'->new->get_compiler("perl");
         
        my ( $schema, %opts ) = @_;
        $schema = normalize_schema( $schema );
         
        return 'Type::Tiny'->new(
                _data_sah  => $schema,
                parent     => ( $schema->[1]{req} ? Item : Optional[Item] ),
                constraint => sub {
                        state $coderef = gen_validator( $schema, coerce => 0 );
                        @_ = $_;
                        goto $coderef
                },
                inlined    => sub {
                        my $varname = pop;
                        my $cd;
                        my $handle_varname = '';
                         
                        if ( $varname =~ /\A\$([^\W0-9]\w*)\z/ ) {
                                $cd = $pl->compile( schema => $schema, coerce => 0, data_name => "$1" );
                        }
                        else {
                                $cd = $pl->compile( schema => $schema, coerce => 0, data_name => 'data' );
                                $handle_varname = "my \$data = $varname;";
                        }
                         
                        my $code = $cd->{result};
                        my $load_modules = join '',
                                map $pl->stmt_require_module($_), @{ $cd->{modules} };
                         
                        return "do { $handle_varname $load_modules $code }";
                },
                constraint_generator => sub {
                        my @params = @_;
                        my $new_schema = [ $schema->[0], { %{ $schema->[1] }, @params } ];
                        my $child = sah2type( $new_schema, parameters => \@params );
                        $child->check(undef); # force type checks to compile BEFORE parent
                        $child->{parent} = $Type::Tiny::parameterize_type;
                        return $child;
                },
                ( exists($schema->[1]{default})
                        ? ( type_default => sub { $schema->[1]{default} } )
                        : () ),
                _build_coercion => sub {
                        my $coercion = shift;
                        my $f = gen_validator( $schema, { return_type => 'bool_valid+val' } );
                        $coercion->add_type_coercions(
                                Item() => sub {
                                        my ( undef, $new ) = @{ $f->($_) };
                                        return $new;
                                },
                        );
                        $coercion->freeze;
                },
                %opts,
        );
}
1;
__END__
=pod
=encoding utf-8
=head1 NAME
Type::FromSah - create an efficient Type::Tiny type constraint from a Data::Sah schema
=head1 SYNOPSIS
  package My::Types {
    use Type::Library -base;
    use Type::FromSah qw( sah2type );
     
    __PACKAGE__->add_type(
      sah2type( [ "int", min => 1, max => 10 ], name => 'SmallInt' )
    );
  }
   
  use MyTypes qw(SmallInt);
   
  SmallInt->assert_valid( 7 );
=head1 DESCRIPTION
=head2 Functions
This module exports one function.
=head3 C<< sah2type( $schema, %options ) >>
Takes a L<Data::Sah> schema (which should be an arrayref), and generates
a L<Type::Tiny> type constraint object for it. Additional key-value pairs
will be passed to the Type::Tiny constructor.
=head1 BUGS
Please report any bugs to
L<http://rt.cpan.org/Dist/Display.html?Queue=Type-FromSah>.
=head1 SEE ALSO
L<Data::Sah>, L<Type::Tiny>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 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.
=head1 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.