<?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\DependencyInjection\Loader\Configurator;

use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Parameter;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\ExpressionLanguage\Expression;

abstract class AbstractConfigurator
{
    const FACTORY = 'unknown';

    /** @internal */
    protected $definition;

    public function __call($method, $args)
    {
        if (method_exists($this, 'set'.$method)) {
            return call_user_func_array(array($this, 'set'.$method), $args);
        }

        throw new \BadMethodCallException(sprintf('Call to undefined method %s::%s()', get_class($this), $method));
    }

    /**
     * Checks that a value is valid, optionally replacing Definition and Reference configurators by their configure value.
     *
     * @param mixed $value
     * @param bool  $allowServices whether Definition and Reference are allowed; by default, only scalars and arrays are
     *
     * @return mixed the value, optionally cast to a Definition/Reference
     */
    public static function processValue($value, $allowServices = false)
    {
        if (is_array($value)) {
            foreach ($value as $k => $v) {
                $value[$k] = static::processValue($v, $allowServices);
            }

            return $value;
        }

        if ($value instanceof ReferenceConfigurator) {
            return new Reference($value->id, $value->invalidBehavior);
        }

        if ($value instanceof InlineServiceConfigurator) {
            $def = $value->definition;
            $value->definition = null;

            return $def;
        }

        if ($value instanceof self) {
            throw new InvalidArgumentException(sprintf('"%s()" can be used only at the root of service configuration files.', $value::FACTORY));
        }

        switch (true) {
            case null === $value:
            case is_scalar($value):
                return $value;

            case $value instanceof ArgumentInterface:
            case $value instanceof Definition:
            case $value instanceof Expression:
            case $value instanceof Parameter:
            case $value instanceof Reference:
                if ($allowServices) {
                    return $value;
                }
        }

        throw new InvalidArgumentException(sprintf('Cannot use values of type "%s" in service configuration files.', is_object($value) ? get_class($value) : gettype($value)));
    }
}
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