<?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\Annotations;
  
  use SplFileObject;
  
  /**
   * Parses a file for namespaces/use/class declarations.
   *
   * @author Fabien Potencier <fabien@symfony.com>
   * @author Christian Kaps <christian.kaps@mohiva.com>
   */
  final class PhpParser
  {
      /**
       * Parses a class.
       *
       * @param  \ReflectionClass $class A <code>ReflectionClass</code> object.
       * @return array            A list with use statements in the form (Alias => FQN).
       */
      public function parseClass(\ReflectionClass $class)
      {
          if (method_exists($class, 'getUseStatements')) {
              return $class->getUseStatements();
          }
  
          if (false === $filename = $class->getFilename()) {
              return array();
          }
  
          $content = $this->getFileContent($filename, $class->getStartLine());
          $namespace = str_replace('\\', '\\\\', $class->getNamespaceName());
          $content = preg_replace('/^.*?(\bnamespace\s+' . $namespace . '\s*[;{].*)$/s', '\\1', $content);
          $tokenizer = new TokenParser('<?php ' . $content);
  
          $statements = $tokenizer->parseUseStatements($class->getNamespaceName());
  
          return $statements;
      }
  
      /**
       * Get the content of the file right up to the given line number.
       *
       * @param  string $filename   The name of the file to load.
       * @param  int    $lineNumber The number of lines to read from file.
       * @return string The content of the file.
       */
      private function getFileContent($filename, $lineNumber)
      {
          $content = '';
          $lineCnt = 0;
          $file = new SplFileObject($filename);
          while (!$file->eof()) {
              if ($lineCnt++ == $lineNumber) {
                  break;
              }
  
              $content .= $file->fgets();
          }
  
          return $content;
      }
  }