vendor/symfony/monolog-bundle/DependencyInjection/Compiler/LoggerChannelPass.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\Bundle\MonologBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\DefinitionDecorator;
use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;

/**
 * Replaces the default logger by another one with its own channel for tagged services.
 *
 * @author Christophe Coevoet <stof@notk.org>
 */
class LoggerChannelPass implements CompilerPassInterface
{
    protected $channels = array('app');

    public function process(ContainerBuilder $container)
    {
        if (!$container->hasDefinition('monolog.logger')) {
            return;
        }

        // create channels necessary for the handlers
        foreach ($container->findTaggedServiceIds('monolog.logger') as $id => $tags) {
            foreach ($tags as $tag) {
                if (empty($tag['channel']) || 'app' === $tag['channel']) {
                    continue;
                }

                $resolvedChannel = $container->getParameterBag()->resolveValue($tag['channel']);

                $definition = $container->getDefinition($id);
                $loggerId = sprintf('monolog.logger.%s', $resolvedChannel);
                $this->createLogger($resolvedChannel, $loggerId, $container);

                foreach ($definition->getArguments() as $index => $argument) {
                    if ($argument instanceof Reference && 'logger' === (string) $argument) {
                        $definition->replaceArgument($index, $this->changeReference($argument, $loggerId));
                    }
                }

                $calls = $definition->getMethodCalls();
                foreach ($calls as $i => $call) {
                    foreach ($call[1] as $index => $argument) {
                        if ($argument instanceof Reference && 'logger' === (string) $argument) {
                            $calls[$i][1][$index] = $this->changeReference($argument, $loggerId);
                        }
                    }