package HTML::FormFu::Constraint::Regex;

use strict;
use base 'HTML::FormFu::Constraint';

use Regexp::Common;

__PACKAGE__->mk_item_accessors( qw( regex ) );

__PACKAGE__->mk_accessors( qw( common ) );

sub constrain_value {
    my ( $self, $value ) = @_;

    return 1 if !defined $value || $value eq '';

    my $regex;
    
    if ( defined $self->regex ) {
        $regex = $self->regex;
    }
    elsif ( defined $self->common ) {
        my @common = ref $self->common ? @{ $self->common }
                   :                     $self->common;

        $regex = shift @common;
        $regex = $RE{$regex};

        for (@common) {
            $regex = $regex->{ ref $_ ? join( $;, %$_ ) : $_ };
        }
    }
    else {
        $regex = qr/.*/;
    }

    my $ok = $value =~ $regex;

    return $self->not ? !$ok : $ok;
}

1;

__END__

=head1 NAME

HTML::FormFu::Constraint::Regex - Regex Constraint

=head1 DESCRIPTION

Regular expression-based constraint.

=head1 METHODS

=head2 regex

Arguments: $regex

Arguments: $string

=head2 common

Arguments: \@parts

Used to build a L<Regexp::Common> regex.

The following definition is equivalent to 
C<< $RE{URI}{HTTP}{-scheme => 'https?'} >>

    type: Regex
    common: 
      - URI
      - HTTP
      - { '-scheme': 'https?' }

=head1 SEE ALSO

Is a sub-class of, and inherits methods from L<HTML::FormFu::Constraint>

L<HTML::FormFu>

=head1 AUTHOR

Carl Franks C<cfranks@cpan.org>

Based on the original source code of L<HTML::Widget::Constraint::Regex>, by 
Sebastian Riedel, C<sri@oook.de>.

=head1 LICENSE

This library is free software, you can redistribute it and/or modify it under
the same terms as Perl itself.
