filter/tex/texed.php

   1 <?PHP // $Id$
   2       // This function fetches math. images from the data directory
   3       // If not, it obtains the corresponding TeX expression from the cache_tex db table
   4       // and uses mimeTeX to create the image file
   5
   6     $nomoodlecookie = true;     // Because it interferes with caching
   7
   8     require_once("../../config.php");
   9     require_once($CFG->dirroot.'/filter/tex/lib.php');
  10
  11     if (empty($CFG->textfilters)) {
  12         error ('Filter not enabled!');
  13     } else {
  14         $filters = explode(',', $CFG->textfilters);
  15         if (array_search('filter/tex', $filters) === FALSE) {
  16             error ('Filter not enabled!');
  17         }
  18     }
  19
  20     error_reporting(E_ALL);
  21     $texexp = urldecode($_SERVER['QUERY_STRING']);
  22     $texexp = str_replace('formdata=','',$texexp);
  23
  24     if ($texexp) {
  25         $image  = md5($texexp) . ".gif";
  26         $filetype = 'image/gif';
  27         if (!file_exists("$CFG->dataroot/filter/tex")) {
  28             make_upload_directory("filter/tex");
  29         }
  30
  31         $texexp = str_replace('&lt;','<',$texexp);
  32         $texexp = str_replace('&gt;','>',$texexp);
  33         $texexp = preg_replace('!\r\n?!',' ',$texexp);
  34         $cmd = tex_filter_get_cmd($pathname, $texexp);
  35         system($cmd, $status);
  36
  37         if (file_exists($pathname)) {
  38             send_file($pathname, $image);
  39         } else {
  40             echo "Image not found!";
  41         }
  42         exit;
  43     } else {
  44         echo "No tex expresion specified";
  45     }
  46
  47 ?>
  48
  49 <html>
  50 <head><title>mimeTeX Previewer</title></head>
  51 <body>
  52     <p>Now enter your own expression or use the sample provided,
  53      press the Submit button, and mimeTeX's rendering should be
  54      displayed in the little window immediately below it.
  55        <center>
  56           <form action="texed.php" method="get"
  57            target="inlineframe">
  58              <input type="text" name="formdata" size="50"
  59                     value="\Large f(x)=\Bigint_{-\infty}^x~e^{-t^2}dt" />
  60              <input type="submit" />
  61           </form> <br /> <br />
  62           <iframe name="inlineframe" align="middle" width="80%" height="100">
  63           &lt;p&gt;Something is wrong...&lt;/p&gt;
  64           </iframe>
  65        </center> <br />
  66 </body>
  67 </html>