// some Java code

<?php
/*
Plugin Name: Useful text replacements
Plugin URI: http://blog.blackhc.net
Description: Some useful text replacement for annotations and other nifty things.
Version: 1.01
Author: Andreas 'BlackHC' Kirsch
Author URI: http://blog.blackhc.net

Plugin Name: Latex for WordPress
Plugin URI: http://zhiqiang.org/blog/plugin/mimetex
Description: using WordPress.com or public MimeTex service to add latex formula in post and comment. You don't need to install your own latex service.
Version: 2.01
Author: zhiqiang
Author URI: http://zhiqiang.org
*/

/*
  1.3 and higher are maintained by Zhiqiang.

   Copyright 2006  Anders Dahnielson (email : anders@dahnielson.com)

  This program is free software; you can redistribute it 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 more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
  Version-History:
  1.1.2:
  Tweaker: Martin Becker
  Email:   mbecker@physik.uni-wuerzburg.de
  Homepage: http://fstyle.de
  -   Edited discription of plugin, so correct tags will be shown
  -   Put inclusion of Snoopy-Class down into the class (mimetex),
    for in some cases WP will intialize the Snoopy-Class of its own
    after we do here, causing it to not to be able to reinitialize.
    For some reason I don't understand.
    Note: I think all this workaround using our own extra Snoopy-Class can be
    fixed by the wordpress-team by removing the if statement in their Snoopy-Class.
    That would be the case for ./wp-includes/rss-functions.php in ./wp-admin/index.php
  -   Cleaner code

  1.1.1:
  Tweaker: Baris Evrim Demiroz
  Email:   b.evrim /AT/ anlak /DOT/ com
  Homepage: http://www.anlak.com
  -   Switched to Snoopy
  -   Working in comments as well: Thanks to Robert Jones, he gave the code snippet for plugin to work with comments. You may wish to visit him: http://www.jonesieboy.co.uk/blog

  1.1.0:
  Anders Dahnielson, URI: http://dahnielson.com
  -   Anders Dahnielson's original version.
*/

class blackhc_replacements{
  var $uniqueID = 0;

  var $server = "http://l.wordpress.com/latex.php?bg=ffffff&amp;amp;amp;amp;fg=000000&amp;amp;amp;amp;latex=";
  var $img_format = "png";
  // $img_format is 'gif' when using mimetex service.
  // more server:
  // "http://l.wordpress.com/latex.php?latex=";
  // "http://www.bytea.net/cgi-bin/mimetex.cgi?formdata="; 

  function getUniqueID() {
    return $this->uniqueID++;
  }   

  // parsing the text to display tex by putting tex-images-tags into the code created by createTex
  function parse($toParse) {
    // tag specification (which tags are to be replaced)
    // change it to
    // $regex = '#\1 stype in your post
        //$regex = '#\$\$(.*?)\$\$#si';

      $text = $toParse;

      $oldText = "";
      while( $oldText != $text ) {
        $oldText = $text;
        $text = preg_replace_callback('#\(\)!expandable\:(?:(?P<link>[^ $]*?)\#)?(?P<content>(?:.|(?P<brackets>$!(?:(?>[^
]+)|(?P>brackets))* $))*?)$ $#si', array(&amp;amp;amp;amp;$this, 'createExpandableTextFix'), $text);

        $text = preg_replace_callback('#$!
 $$expandable\_ex\:(?P<eod>[^$$ 
]*?)\#(?P<link>[^ $]*?)\#(?P<content>.*?)(?P=eod)$ $#si', array(&amp;amp;amp;amp;$this, 'createExpandableTextExFix'), $text);
      }
    $text = preg_replace_callback('#$!
 $$\:(?:([^$$ 
]*?)\#)?(.*?) #si', array(&amp;amp;amp;amp;$this, 'createAnnotation'), $text);

    $text = preg_replace_callback('#\(\)!wikipedia\:(.*?)(?:(?:\#|\:)(.*?))? #si', array(&amp;amp;amp;amp;$this, 'createWikiLink'), $text);

    $text = preg_replace( array('#\(\)!escape_left #si', '#\(\)!escape_right #si'), array( '[' . '[', ']' . ']'), $text );

    return $text;
  }

  function createWikiLink($match)
  {
    $text = $match[2];
    $page = $match[1];
    if( !$text )
      $text = $page;
    return "<a href=\"http://en.wikipedia.org/wiki/".($page)."\" target=\"_blank\" >".($text)."</a>";
  }

  function createAnnotation($match)
  {
    $superscript = $match[1];
    $text = $match[2];
    if( $superscript == ""  )
      $marker = "<strong>&amp;amp;amp;amp;#180;</strong>";
    else
      $marker = "<sup><strong>" . ($superscript) . "</strong></sup>";

  return "<a class=\"annotation\" title=\"".($text)."\" href=\"javascript:;\">" . ($marker) . "</a>";
  }

  // Big Thanks to Salteh!
  function createExpandableText($match)
  {
    $linkText = $match["link"];
    $text = $match["content"];

  if ($linkText == "") {
    $linkText = "Click to expand";
  }

    $id = "blackhc_expandable_" . ($this->getUniqueID());
  return '<div class="expandable">' .
         '<a class="expandable_link" href="javascript:blackhc_replacements_togglediv(\''. $id . '\');">' . $linkText . ' &amp;amp;amp;amp;#187;</a>' .
         '<div class="expandable_text" name="' . $id . '" id="' . $id . '" style="display:none">' . $text . '</div><br>' .
         '</div>';
  }

  // fix for a php bug
  // the two functions can be removed as soon as preg_replace_callback passes named subpatterns correctly: http://bugs.php.net/bug.php?id=45748
  function createExpandableTextFix( $match ) {
    return $this->createExpandableText( array( "link" => $match[1], "content" => $match[2] ) );
  }

  function createExpandableTextExFix( $match ) {
    return $this->createExpandableText( array( "link" => $match[2], "content" => $match[3] ) );
  }

  // reading the tex-expression and create an image and a image-tag representing that expression
  function createTex($toTex) {
    $formula_text = $toTex[1];
    $imgtext=false;
    if (substr($formula_text, -1, 1) == "!")  return "$".substr($formula_text, 0, -1)."$";
    if (substr($formula_text, 0, 1) == "!") {  $imgtext=true;$formula_text=substr($formula_text, 1);}
    $formula_hash = md5($formula_text);
    $formula_filename = 'tex_'.$formula_hash.'.'.$this->img_format;

    $cache_path = ABSPATH . '/wp-content/cache/';
    $cache_formula_path = $cache_path . $formula_filename;
    $cache_url = get_bloginfo('wpurl') . '/wp-content/cache/';
    $cache_formula_url = $cache_url . $formula_filename;

    if ( !is_file($cache_formula_path)) {
       if (!class_exists('Snoopy')) require_once (ABSPATH.'wp-includes/class-snoopy.php');

      $snoopy = new Snoopy;

      $snoopy->fetch( $this->server.rawurlencode(html_entity_decode($formula_text)));
      // this will copy the created tex-image to your cache-folder
      if(strlen($snoopy->results)){
        $cache_file = fopen($cache_formula_path, 'w');
        fputs($cache_file, $snoopy->results);
        fclose($cache_file);
      }
    }

    // returning the image-tag, referring to the image in your cache folder
    if($imgtext) return "<center><img src=\"$cache_formula_url\" align=\"absmiddle\" class=\"tex\" alt=\"".($formula_text)."\" /></center>";
    return "<img src=\"$cache_formula_url\" align=\"absmiddle\" class=\"tex\" alt=\"".($formula_text)."\" />";
  }  

  function headerAdditions() {
    // additions for expandable text
    echo '
  <script language="JavaScript">
  function blackhc_replacements_togglediv(divname) {
    var div = document.getElementById(divname);
    div.style.display = (div.style.display=="none") ? "" : "none";
  }
  </script>
  ';
   }
}

$mimetex_object = new blackhc_replacements;
// this specifies where parsing should be done. one can look up further information on wordpress.org
add_action('wp_head', array($mimetex_object, 'headerAdditions') );

add_filter('the_title', array($mimetex_object, 'parse'), 1);
add_filter('the_content', array($mimetex_object, 'parse'), 1);
add_filter('the_excerpt', array($mimetex_object, 'parse'), 1);
// dont allow embedding stuff into comments for security reasons
//add_filter('comment_text', array($mimetex_object, 'parseTex'), 1);

?>