Numeric.php

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<?php

/* Copyright (c) 2017 Timon Amstutz <timon.amstutz@ilub.unibe.ch> Extended GPL, see
docs/LICENSE */

namespace ILIAS\UI\Implementation\Component\Input\Field;

use ILIAS\Data\Factory as DataFactory;
use ILIAS\UI\Component as C;
use ILIAS\Validation\Factory as ValidationFactory;
use ILIAS\Transformation\Factory as TransformationFactory;

class Numeric extends Input implements C\Input\Field\Numeric
{

    public function __construct(
        DataFactory $data_factory,
        ValidationFactory $validation_factory,
        TransformationFactory $transformation_factory,
        $label,
        $byline
    ) {
        parent::__construct($data_factory, $validation_factory, $transformation_factory, $label, $byline);

        $this->setAdditionalTransformation(
            $this->transformation_factory->custom(
                function ($v) {
                    if (trim($v) === '') {
                        return null;
                    }
                    return $v;
                }
            )
        );

        //TODO: Is there a better way to do this? Note, that "withConstraint" is not
        // usable here (clone).
        $this->setAdditionalConstraint(
            $this->validation_factory->or(
                [
                    $this->validation_factory->isNumeric(),
                    $this->validation_factory->isNull()
                ]
            )
        );
    }


    protected function isClientSideValueOk($value)
    {
        return is_numeric($value) || $value === "" || $value === null;
    }


    protected function getConstraintForRequirement()
    {
        return $this->validation_factory->isNumeric();
    }
}