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Filename : ScalarNode.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Config\Definition;

use Symfony\Component\Config\Definition\Exception\InvalidTypeException;

/**
 * This node represents a scalar value in the config tree.
 *
 * The following values are considered scalars:
 *   * booleans
 *   * strings
 *   * null
 *   * integers
 *   * floats
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class ScalarNode extends VariableNode
{
    /**
     * {@inheritdoc}
     */
    protected function validateType($value)
    {
        if (!is_scalar($value) && null !== $value) {
            $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected scalar, but got %s.', $this->getPath(), \gettype($value)));
            if ($hint = $this->getInfo()) {
                $ex->addHint($hint);
            }
            $ex->setPath($this->getPath());

            throw $ex;
        }
    }

    /**
     * {@inheritdoc}
     */
    protected function isValueEmpty($value)
    {
        // assume environment variables are never empty (which in practice is likely to be true during runtime)
        // not doing so breaks many configs that are valid today
        if ($this->isHandlingPlaceholder()) {
            return false;
        }

        return null === $value || '' === $value;
    }

    /**
     * {@inheritdoc}
     */
    protected function getValidPlaceholderTypes(): array
    {
        return ['bool', 'int', 'float', 'string'];
    }
}