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  $self->add_check(like     => sub { $_[2] !~ $_[3] });
  $self->add_check(num      => \&_num);
  $self->add_check(size     => \&_size);
  $self->add_check(upload   => sub { !ref $_[2] || !$_[2]->isa('Mojo::Upload') });

  return $self;
}

sub validation { Mojolicious::Validator::Validation->new(validator => shift) }

sub _comma_separated { defined $_[2] ? split(/\s*,\s*/, $_[2], -1) : undef }

sub _equal_to {
  my ($v, $name, $value, $to) = @_;
  return 1 unless defined(my $other = $v->input->{$to});
  return $value ne $other;
}

sub _in {
  my ($v, $name, $value) = (shift, shift, shift);
  $value eq $_ && return undef for @_;
  return 1;
}

sub _not_empty { length $_[2] ? $_[2] : () }

sub _num {
  my ($v, $name, $value, $min, $max) = @_;
  return 1 if $value !~ /^-?[0-9]+$/;
  return defined $min && $min > $value || defined $max && $max < $value;
}

sub _size {
  my ($v, $name, $value, $min, $max) = @_;
  my $len = ref $value ? $value->size : length $value;
  return (defined $min && $len < $min) || (defined $max && $len > $max);
}

sub _trim { defined $_[2] ? trim $_[2] : undef }

1;

=encoding utf8

=head1 NAME

Mojolicious::Validator - Validate values

=head1 SYNOPSIS

  use Mojolicious::Validator;

  my $validator = Mojolicious::Validator->new;
  my $v = $validator->validation;
  $v->input({foo => 'bar'});
  $v->required('foo')->like(qr/ar$/);
  say $v->param('foo');

=head1 DESCRIPTION

L<Mojolicious::Validator> validates values for L<Mojolicious>.

=head1 CHECKS

These validation checks are available by default.

=head2 equal_to

  $v = $v->equal_to('foo');

String value needs to be equal to the value of another field.

=head2 in

  $v = $v->in('foo', 'bar', 'baz');

String value needs to match one of the values in the list.

=head2 like

  $v = $v->like(qr/^[A-Z]/);

String value needs to match the regular expression.

=head2 num

  $v = $v->num;
  $v = $v->num(2, 5);
  $v = $v->num(-3, 7);
  $v = $v->num(2, undef);
  $v = $v->num(undef, 5);

String value needs to be a non-fractional number (positive or negative) and if provided in the given range.

=head2 size

  $v = $v->size(2, 5);
  $v = $v->size(2, undef);
  $v = $v->size(undef, 5);

String value length or size of L<Mojo::Upload> object in bytes needs to be between these two values.

=head2 upload

  $v = $v->upload;

Value needs to be a L<Mojo::Upload> object, representing a file upload.

=head1 FILTERS

These filters are available by default.

=head2 comma_separated

  $v = $v->optional('foo', 'comma_separated');

Split string of comma separated values into separate values.

=head2 not_empty

  $v = $v->optional('foo', 'not_empty');