mirror of
https://github.com/moodle/moodle.git
synced 2025-08-08 18:36:42 +02:00
85 lines
3 KiB
PHP
85 lines
3 KiB
PHP
<?PHP // $Id$
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// This function fetches math. images from the data directory
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// If not, it obtains the corresponding TeX expression from the cache_tex db table
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// and uses mimeTeX to create the image file
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$nomoodlecookie = true; // Because it interferes with caching
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require_once('../../config.php');
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if (empty($CFG->textfilters)) {
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error ('Filter not enabled!');
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} else {
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$filters = explode(',', $CFG->textfilters);
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if (array_search('filter/tex', $filters) === FALSE) {
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error ('Filter not enabled!');
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}
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}
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// disable moodle specific debug messages
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disable_debugging();
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require_once($CFG->libdir.'/filelib.php');
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require_once($CFG->dirroot.'/filter/tex/lib.php');
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require_once($CFG->dirroot.'/filter/tex/latex.php');
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$cmd = ''; // Initialise these variables
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$status = '';
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error_reporting(E_ALL);
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$relativepath = get_file_argument('pix.php');
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$args = explode('/', trim($relativepath, '/'));
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if (count($args) == 1) {
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$image = $args[0];
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$pathname = $CFG->dataroot.'/filter/tex/'.$image;
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} else {
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error('No valid arguments supplied');
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}
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if (!file_exists($pathname)) {
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$md5 = str_replace('.gif','',$image);
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if ($texcache = get_record('cache_filters', 'filter', 'tex', 'md5key', $md5)) {
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if (!file_exists($CFG->dataroot.'/filter/tex')) {
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make_upload_directory('filter/tex');
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}
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// try and render with latex first
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$latex = new latex();
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$density = $CFG->filter_tex_density;
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$background = $CFG->filter_tex_latexbackground;
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$texexp = html_entity_decode($texcache->rawtext);
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$latex_path = $latex->render($texexp, $md5, 12, $density, $background);
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if ($latex_path) {
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copy($latex_path, $pathname);
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$latex->clean_up($md5);
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} else {
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// failing that, use mimetex
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$texexp = $texcache->rawtext;
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$texexp = str_replace('<', '<', $texexp);
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$texexp = str_replace('>', '>', $texexp);
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$texexp = preg_replace('!\r\n?!', ' ', $texexp);
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$texexp = '\Large '.$texexp;
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$cmd = tex_filter_get_cmd($pathname, $texexp);
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system($cmd, $status);
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}
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}
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}
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if (file_exists($pathname)) {
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send_file($pathname, $image);
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} else {
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if (debugging()) {
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echo "The shell command<br />$cmd<br />returned status = $status<br />\n";
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echo "Image not found!<br />";
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echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a>";
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} else {
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echo "Image not found!<br />";
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echo "Please try the <a href=\"$CFG->wwwroot/filter/tex/texdebug.php\">debugging script</a><br />";
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echo "Please turn on debug mode in site configuration to see more info here.";
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}
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}
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?>
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