vendor/sensio/generator-bundle/Manipulator/ConfigurationManipulator.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 Sensio\Bundle\GeneratorBundle\Manipulator;

use Sensio\Bundle\GeneratorBundle\Model\Bundle;
use Symfony\Component\Yaml\Yaml;

/**
 * Changes the PHP code of a YAML services configuration file.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Ryan Weaver <weaverryan@gmail.com>
 */
class ConfigurationManipulator extends Manipulator
{
    private $file;

    /**
     * @param string $file The YAML configuration file path
     */
    public function __construct($file)
    {
        $this->file = $file;
    }

    /**
     * Adds a configuration resource at the top of the existing ones.
     *
     * @param Bundle $bundle
     *
     * @throws \RuntimeException If this process fails for any reason
     */
    public function addResource(Bundle $bundle)
    {
        // if the config.yml file doesn't exist, don't even try.
        if (!file_exists($this->file)) {
            throw new \RuntimeException(sprintf('The target config file %s does not exist', $this->file));
        }

        $code = $this->getImportCode($bundle);

        $currentContents = file_get_contents($this->file);
        // Don't add same bundle twice
        if (false !== strpos($currentContents, $code)) {
            throw new \RuntimeException(sprintf('The %s configuration file from %s is already imported', $bundle->getServicesConfigurationFilename(), $bundle->getName()));
        }

        // find the "imports" line and add this at the end of that list
        $lastImportedPath = $this->findLastImportedPath($currentContents);
        if (!$lastImportedPath) {
            throw new \RuntimeException(sprintf('Could not find the imports key in %s', $this->file));