<?php

/*

Plugin Name: Mediafier

Plugin URI: http://enanocms.org/Mediafier

Description: Several parser extensions that provide MediaWiki-like support for references, search highlighting, and a table of contents to Enano

Author: Dan Fuhry

Version: 0.1 beta 1

Author URI: http://enanocms.org/

*/

/*

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

 */

$plugins->attachHook('render_wikiformat_post', 'mediafy($result);');

$plugins->attachHook('compile_template', 'mediafier_add_headers();');

$plugins->attachHook('html_attribute_whitelist', '$whitelist["ref"] = array(); $whitelist["references"] = array("/");');

function mediafy(&$text)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  mediafy_highlight_search_words($text);

  mediafy_process_references($text);

}

function mediafier_add_headers()

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  $template->add_header("<style type=\"text/css\">

                        .highlight  { background-color: #FFFFC0; font-weight: bold; }

                        .refbak     { background-color: #E0E0FF; font-weight: bold; }

                        .references { font-size: smaller; }

                      </style>");

  $ref_script = <<<EOF

      <enano:no-opt>

      <script type="text/javascript">

      // <![CDATA[

        function refsOff()

        {

          var divs = getElementsByClassName(document, '*', 'refbottom');

          for ( var i in divs )

          {

            $(divs[i]).rmClass('refbak');

          }

          divs = getElementsByClassName(document, '*', 'reftop');

          for ( var i in divs )

          {

            $(divs[i]).rmClass('refbak');

          }

        }

        function refToBottom(id)

        {

          refsOff();

          $('ref_'+id+'_b').addClass('refbak');

        }

        function refToTop(id)

        {

          refsOff();

          $('cite_'+id).addClass('refbak');

        }

        // ]]>

      </script>

      </enano:no-opt>

EOF;

  $template->add_header($ref_script);

}

function mediafy_highlight_search_words(&$result)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  if ( !isset($_SERVER['HTTP_REFERER']) && !isset($_GET['highlight']) )

    return false;

  $referer = ( isset($_GET['highlight']) ) ? $_SERVER['REQUEST_URI'] : $_SERVER['HTTP_REFERER'];

  $term = ( isset($_GET['highlight']) ) ? 'highlight' : 'q';

  preg_match('/(\?|&)'.$term.'=(.+?)(&|$)/', $referer, $match);

  if ( !isset($match[2]) )

  {

    return false;

  }

  $words = $match[2];

  $words = urldecode($words);

  if ( $term == 'q' )

  {

    // it's from a search query - extract terms

    require_once(ENANO_ROOT . '/includes/search.php');

    $words = parse_search_query($words, $warnings);

    $words = array_merge($words['any'], $words['req']);

  }

  else

  {

    $words = explode(' ', $words);

  }

  // strip HTML out of the rendered text

  $rand_seed = $session->dss_rand();

  preg_match_all('/<.+?>/', $result, $html_matches);

  $i = 0;

  foreach ( $html_matches[0] as $match )

  {

    $i++;

    $result = str_replace($match, "{HIGHLIGHT_PLACEHOLDER:$i:$rand_seed}", $result);

  }

  // highlight matches

  foreach ( $words as $word )

  {

    $result = preg_replace('/([\W]|^)(' . preg_quote($word) . ')([\W])/i', "\\1<span class=\"highlight\">\\2</span>\\3", $result);

  }

  // restore HTML

  $i = 0;

  foreach ( $html_matches[0] as $match )

  {

    $i++;

    $result = str_replace("{HIGHLIGHT_PLACEHOLDER:$i:$rand_seed}", $match, $result);

  }

  // add "remove highlighting" link

  $result = '<div style="float: right; text-align: right;"><a href="' . makeUrl($paths->page) . '" onclick="ajaxReset(); return false;">Turn off <span class="highlight">highlighting</span></a></div>' .

            $result;

}

function mediafy_process_references(&$text)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  // Is there a <references /> in the wikitext? If not, just return out to avoid empty processing

  if ( !preg_match('#<references(([ ]*)/)?>#', $text) )

  {

    //die('no match');

    return false;

  }

  // Retrieve references

  preg_match_all('#<ref>(.+?)</ref>#s', $text, $matches);

  // Init counter

  $i = 0;

  // Init refs array

  $refs = array();

  // main parser loop

  foreach ( $matches[0] as $j => $match )

  {

    $i++;

    $inner =& $matches[1][$j];

    $refs[$i] = $inner;

    $reflink = '<sup><a class="reftop" id="cite_' . $i . '" name="cite_' . $i . '" href="#ref_' . $i . '" onclick="refToBottom(\'' . $i . '\');">[' . $i . ']</a></sup>';

    $text = str_replace($match, $reflink, $text);

  }

  // compile refs div

  $refsdiv = '<div class="references">';

  $refsdiv .= '<table border="0" width="100%"><tr><td valign="top">';

  $count = ( count($refs) >= 20 ) ? floor(count($refs) / 2) : 99;

  foreach ( $refs as $i => $ref )

  {

    $reflink = '<span id="ref_' . $i . '" name="ref_' . $i . '"><sup><b><a onclick="refToTop(\'' . $i . '\');" href="#cite_' . $i . '">^</a></b></sup> </span>';

    $refsdiv .= "<div class=\"refbottom\" id=\"ref_{$i}_b\">$reflink $i. $ref</div>";

    if ( $i == $count )

      $refsdiv .= '</td><td valign="top">';

  }

  $refsdiv .= '</td></tr></table>';

  $refsdiv .= '</div>';

  preg_match('#<references(([ ]*)/)?>#', $text, $match);

  $text = str_replace_once($match[0], $refsdiv, $text);

}

?>