Error.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) 2009 Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Twig base exception.
 *
 * @package    twig
 * @author     Fabien Potencier <fabien@symfony.com>
 */
class Twig_Error extends Exception {
  protected $lineno;
  protected $filename;
  protected $rawMessage;
  protected $previous;

  /**
   * Constructor.
   *
   * @param string    $message  The error message
   * @param integer   $lineno   The template line where the error occurred
   * @param string    $filename The template file name where the error occurred
   * @param Exception $previous The previous exception
   */
  public function __construct($message, $lineno = -1, $filename = null, Exception $previous = null) {
    if (version_compare(PHP_VERSION, '5.3.0', '<')) {
      $this->previous = $previous;
      parent::__construct('');
    }
    else {
      parent::__construct('', 0, $previous);
    }
    $this->lineno = $lineno;
    $this->filename = $filename;
    if (-1 === $this->lineno || null === $this->filename) {
      $this
        ->guessTemplateInfo();
    }
    $this->rawMessage = $message;
    $this
      ->updateRepr();
  }

  /**
   * Gets the raw message.
   *
   * @return string The raw message
   */
  public function getRawMessage() {
    return $this->rawMessage;
  }

  /**
   * Gets the filename where the error occurred.
   *
   * @return string The filename
   */
  public function getTemplateFile() {
    return $this->filename;
  }

  /**
   * Sets the filename where the error occurred.
   *
   * @param string $filename The filename
   */
  public function setTemplateFile($filename) {
    $this->filename = $filename;
    $this
      ->updateRepr();
  }

  /**
   * Gets the template line where the error occurred.
   *
   * @return integer The template line
   */
  public function getTemplateLine() {
    return $this->lineno;
  }

  /**
   * Sets the template line where the error occurred.
   *
   * @param integer $lineno The template line
   */
  public function setTemplateLine($lineno) {
    $this->lineno = $lineno;
    $this
      ->updateRepr();
  }

  /**
   * For PHP < 5.3.0, provides access to the getPrevious() method.
   *
   * @param string $method    The method name
   * @param array  $arguments The parameters to be passed to the method
   *
   * @return Exception The previous exception or null
   */
  public function __call($method, $arguments) {
    if ('getprevious' == strtolower($method)) {
      return $this->previous;
    }
    throw new BadMethodCallException(sprintf('Method "Twig_Error::%s()" does not exist.', $method));
  }
  protected function updateRepr() {
    $this->message = $this->rawMessage;
    $dot = false;
    if ('.' === substr($this->message, -1)) {
      $this->message = substr($this->message, 0, -1);
      $dot = true;
    }
    if (null !== $this->filename) {
      if (is_string($this->filename) || is_object($this->filename) && method_exists($this->filename, '__toString')) {
        $filename = sprintf('"%s"', $this->filename);
      }
      else {
        $filename = json_encode($this->filename);
      }
      $this->message .= sprintf(' in %s', $filename);
    }
    if ($this->lineno >= 0) {
      $this->message .= sprintf(' at line %d', $this->lineno);
    }
    if ($dot) {
      $this->message .= '.';
    }
  }
  protected function guessTemplateInfo() {
    $template = null;
    foreach (debug_backtrace() as $trace) {
      if (isset($trace['object']) && $trace['object'] instanceof Twig_Template && 'Twig_Template' !== get_class($trace['object'])) {
        $template = $trace['object'];

        // update template filename
        if (null === $this->filename) {
          $this->filename = $template
            ->getTemplateName();
        }
        break;
      }
    }
    if (null === $template || $this->lineno > -1) {
      return;
    }
    $r = new ReflectionObject($template);
    $file = $r
      ->getFileName();
    $exceptions = array(
      $e = $this,
    );
    while (($e instanceof self || method_exists($e, 'getPrevious')) && ($e = $e
      ->getPrevious())) {
      $exceptions[] = $e;
    }
    while ($e = array_pop($exceptions)) {
      $traces = $e
        ->getTrace();
      while ($trace = array_shift($traces)) {
        if (!isset($trace['file']) || !isset($trace['line']) || $file != $trace['file']) {
          continue;
        }
        foreach ($template
          ->getDebugInfo() as $codeLine => $templateLine) {
          if ($codeLine <= $trace['line']) {

            // update template line
            $this->lineno = $templateLine;
            return;
          }
        }
      }
    }
  }

}