<?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 (-1 === $lineno || null === $filename) {

            list($lineno, $filename) = $this->findTemplateInfo(null !== $previous ? $previous : $this, $lineno, $filename);

        }

        $this->lineno = $lineno;

        $this->filename = $filename;

        $this->rawMessage = $message;

        $this->updateRepr();

        if (version_compare(PHP_VERSION, '5.3.0', '<')) {

            $this->previous = $previous;

            parent::__construct($this->message);

        } else {

            parent::__construct($this->message, 0, $previous);

        }

    }

    /**

     * 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) {

            $this->message .= sprintf(' in %s', json_encode($this->filename));

        }

        if ($this->lineno >= 0) {

            $this->message .= sprintf(' at line %d', $this->lineno);

        }

        if ($dot) {

            $this->message .= '.';

        }

    }

    protected function findTemplateInfo(Exception $e, $currentLine, $currentFile)

    {

        if (!function_exists('token_get_all')) {

            return array($currentLine, $currentFile);

        }

        $traces = $e->getTrace();

        foreach ($traces as $i => $trace) {

            if (!isset($trace['class']) || 'Twig_Template' === $trace['class']) {

                continue;

            }

            $r = new ReflectionClass($trace['class']);

            if (!$r->implementsInterface('Twig_TemplateInterface')) {

                continue;

            }

            if (!file_exists($r->getFilename())) {

                // probably an eval()'d code

                return array($currentLine, $currentFile);

            }

            if (0 === $i) {

                $line = $e->getLine();

            } else {

                $line = isset($traces[$i - 1]['line']) ? $traces[$i - 1]['line'] : -log(0);

            }

            $tokens = token_get_all(file_get_contents($r->getFilename()));

            $templateline = -1;

            $template = null;

            while ($token = array_shift($tokens)) {

                if (isset($token[2]) && $token[2] >= $line) {

                    return array($templateline, $template);

                }

                if (T_COMMENT === $token[0] && null === $template && preg_match('#/\* +(.+) +\*/#', $token[1], $match)) {

                    $template = $match[1];

                } elseif (T_COMMENT === $token[0] && preg_match('#^//\s*line (\d+)\s*$#', $token[1], $match)) {

                    $templateline = $match[1];

                }

            }

            return array($currentLine, $template);

        }

        return array($currentLine, $currentFile);

    }

}