/usr/share/php/PDepend/DependencyInjection/Configuration.php is in pdepend 2.2.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
 * This file is part of PDepend.
 *
 * PHP Version 5
 *
 * Copyright (c) 2008-2015, Manuel Pichler <mapi@pdepend.org>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Manuel Pichler nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @copyright 2008-2015 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */
namespace PDepend\DependencyInjection;
use PDepend\Util\FileUtil;
use PDepend\Util\Workarounds;
use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;
/**
 * This is the class that validates and merges configuration
 *
 * @copyright 2008-2015 Manuel Pichler. All rights reserved.
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */
class Configuration implements ConfigurationInterface
{
    /**
     * @var array(Extension)
     */
    private $extensions = array();
    public function __construct(array $extensions)
    {
        $this->extensions = $extensions;
    }
    /**
     * {@inheritDoc}
     */
    public function getConfigTreeBuilder()
    {
        $home = FileUtil::getUserHomeDirOrSysTempDir();
        $workarounds = new Workarounds();
        $defaultCacheDriver = ($workarounds->hasSerializeReferenceIssue()) ? 'memory' : 'file';
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('pdepend');
        $rootNode
            ->children()
            ->arrayNode('cache')
            ->addDefaultsIfNotSet()
            ->children()
            ->enumNode('driver')->defaultValue($defaultCacheDriver)->values(array('file', 'memory'))->end()
            ->scalarNode('location')->defaultValue($home . '/.pdepend')->end()
            ->end()
            ->end()
            ->arrayNode('image_convert')
            ->addDefaultsIfNotSet()
            ->children()
            ->scalarNode('font_size')->defaultValue('11')->end()
            ->scalarNode('font_family')->defaultValue('Arial')->end()
            ->end()
            ->end()
            ->arrayNode('parser')
            ->addDefaultsIfNotSet()
            ->children()
            ->integerNode('nesting')->defaultValue(65536)->end()
            ->end()
            ->end()
            ->end();
        $extensionsNode = $rootNode
            ->children()
            ->arrayNode('extensions')
            ->addDefaultsIfNotSet()
            ->children();
        foreach ($this->extensions as $extension) {
            $extensionNode = $extensionsNode->arrayNode($extension->getName());
            $extension->getConfig($extensionNode);
        }
        return $treeBuilder;
    }
}
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