# ABSTRACT: Decimal Directive for Validation Class Field Definitions

package Validation::Class::Directive::Decimal;

use strict;
use warnings;

use base 'Validation::Class::Directive';

use Validation::Class::Util;

# VERSION


has 'mixin'   => 1;
has 'field'   => 1;
has 'multi'   => 0;
has 'message' => '%s requires a valid decimal number';

sub validate {

    my ($self, $proto, $field, $param) = @_;

    if (defined $field->{decimal}) {

    # checks for a valid decimal. Both the sign and exponent are optional

    # 0 => Any number of decimal places, including none
    # 1 => Any number of decimal places greater than 0, or a float|double
    # 2 => Exactly that many number of decimal places

        if (defined $param) {

            my $type = $field->{decimal};

            my $lnum = '[0-9]+';
                my $dnum = "[0-9]*[\.]${lnum}";
            my $sign = '[+-]?';
            my $exp  = "(?:[eE]${sign}${lnum})?";

            my $dre;

            if ($type == 0) {
                $dre = qr/^${sign}(?:${lnum}|${dnum})${exp}$/;
            }

            elsif ($type == 1) {
                $dre = qr/^${sign}${dnum}${exp}$/;
            }

            else {
                $type = "[0-9]\{${type}}";
                $dnum = "(?:[0-9]*[\.]${type}|${lnum}[\.]${type})";
                $dre  = qr/^${sign}${dnum}${exp}$/;
            }

            $self->error($proto, $field) unless $param =~ $dre;

        }

    }

    return $self;

}

1;

__END__
=pod

=head1 NAME

Validation::Class::Directive::Decimal - Decimal Directive for Validation Class Field Definitions

=head1 VERSION

version 7.900005

=head1 SYNOPSIS

    use Validation::Class::Simple;

    my $rules = Validation::Class::Simple->new(
        fields => {
            amount_paid  => {
                decimal => 1
            }
        }
    );

    # set parameters to be validated
    $rules->params->add($parameters);

    # validate
    unless ($rules->validate) {
        # handle the failures
    }

=head1 DESCRIPTION

Validation::Class::Directive::Decimal is a core validation class field
directive that provides validation of floating point integers.

=over 8

=item * alternative argument: a-single-variable-value

=item * option: 0 e.g. Any number of decimal places, including none

=item * option: 1 e.g. Any number of decimal places greater than 0, or a float|double

=item * option: $n e.g. Exactly that many number of decimal places

This directive can be passed a single value only:

    fields => {
        amount_paid  => {
            decimal => 2 # 2 decimal places
        }
    }

=back

=head1 AUTHOR

Al Newkirk <anewkirk@ana.io>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Al Newkirk.

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

=cut