Psr0FindFile.php

<?php

/*
 * 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.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */
namespace Doctrine\Common\Reflection;


/**
 * Finds a class in a PSR-0 structure.
 *
 * @author Karoly Negyesi <karoly@negyesi.net>
 */
class Psr0FindFile implements ClassFinderInterface {

  /**
   * The PSR-0 prefixes.
   *
   * @var string
   */
  protected $prefixes;

  /**
   * @param string $prefixes
   *     An array of prefixes. Each key is a PHP namespace and each value is
   *     a list of directories.
   */
  public function __construct($prefixes) {
    $this->prefixes = $prefixes;
  }

  /**
   * Finds a class.
   *
   * @param string $class The name of the class.
   *
   * @return
   *     The name of the class or NULL if not found.
   */
  public function findFile($class) {
    $lastNsPos = strrpos($class, '\\');
    if ('\\' == $class[0]) {
      $class = substr($class, 1);
    }
    if (false !== $lastNsPos) {

      // namespaced class name
      $classPath = str_replace('\\', DIRECTORY_SEPARATOR, substr($class, 0, $lastNsPos)) . DIRECTORY_SEPARATOR;
      $className = substr($class, $lastNsPos + 1);
    }
    else {

      // PEAR-like class name
      $classPath = null;
      $className = $class;
    }
    $classPath .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
    foreach ($this->prefixes as $prefix => $dirs) {
      if (0 === strpos($class, $prefix)) {
        foreach ($dirs as $dir) {
          if (file_exists($dir . DIRECTORY_SEPARATOR . $classPath)) {
            return $dir . DIRECTORY_SEPARATOR . $classPath;
          }
        }
      }
    }
  }

}