in
// comments. For more info see wp-includes/kses.php
if (!CUSTOM_TAGS) {
  $allowedposttags['pre'] = array(
    'lang' => array(),
    'line' => array(),
    'style' => array(),
    'width' => array(),
  );
  //Allow plugin use in comments
  $allowedtags['pre'] = array(
    'lang' => array(),
    'line' => array(),
  );
}

include_once("geshi/geshi.php");

function wp_syntax_head()
{
  $css_url = get_bloginfo("wpurl") . "/wp-content/plugins/wp-syntax/wp-syntax.css";
  if (file_exists(TEMPLATEPATH . "/wp-syntax.css"))
  {
    $css_url = get_bloginfo("template_url") . "/wp-syntax.css";
  }
  echo "\n".''."\n";
}

function wp_syntax_code_trim($code)
{
    // special ltrim b/c leading whitespace matters on 1st line of content
    $code = preg_replace("/^\s*\n/siU", "", $code);
    $code = rtrim($code);
    return $code;
}

function wp_syntax_substitute(&$match)
{
    global $wp_syntax_token, $wp_syntax_matches;

    $i = count($wp_syntax_matches);
    $wp_syntax_matches[$i] = $match;

    return "\n\n
" . $wp_syntax_token . sprintf("%03d", $i) . "
\n\n";
}

function wp_syntax_line_numbers($code, $start)
{
    $line_count = count(explode("\n", $code));
    $output = "
";
    for ($i = 0; $i < $line_count; $i++)
    {
        $output .= ($start + $i) . "\n";
    }
    $output .= "
";
    return $output;
}

function wp_syntax_highlight($match)
{
    global $wp_syntax_matches;

    $i = intval($match[1]);
    $match = $wp_syntax_matches[$i];

    $language = strtolower(trim($match[1]));
    $line = trim($match[2]);
    $code = wp_syntax_code_trim($match[3]);

    $geshi = new GeSHi($code, $language);
    $geshi->enable_keyword_links(false);
    do_action_ref_array('wp_syntax_init_geshi', array(&$geshi));

    $output = "\n
";

    if ($line)
    {
        $output .= "
";
        $output .= wp_syntax_line_numbers($code, $line);
        $output .= "
";
        $output .= $geshi->parse_code();
        $output .= "
";
    }
    else
    {
        $output .= "
";
        $output .= $geshi->parse_code();
        $output .= "
";
    }
    return

    $output .= "
\n";

    return $output;
}

function wp_syntax_before_filter($content)
{
    return preg_replace_callback(
        "/\s*(.*)<\/pre>\s*/siU",
        "wp_syntax_substitute",
        $content
    );
}

function wp_syntax_after_filter($content)
{
    global $wp_syntax_token;

     $content = preg_replace_callback(
         "/
\s*".$wp_syntax_token."(\d{3})\s*<\/p>/si",
         "wp_syntax_highlight",
         $content
     );

    return $content;
}

$wp_syntax_token = md5(uniqid(rand()));

// Add styling
add_action('wp_head', 'wp_syntax_head');

// We want to run before other filters; hence, a priority of 0 was chosen.
// The lower the number, the higher the priority.  10 is the default and
// several formatting filters run at or around 6.
add_filter('the_content', 'wp_syntax_before_filter', 0);
add_filter('the_excerpt', 'wp_syntax_before_filter', 0);
add_filter('comment_text', 'wp_syntax_before_filter', 0);

// We want to run after other filters; hence, a priority of 99.
add_filter('the_content', 'wp_syntax_after_filter', 99);
add_filter('the_excerpt', 'wp_syntax_after_filter', 99);
add_filter('comment_text', 'wp_syntax_after_filter', 99);

?>