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efrain |
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<?php
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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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// disable moodle specific debug messages and any errors in output
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define('NO_DEBUG_DISPLAY', true);
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define('NO_MOODLE_COOKIES', true); // Because it interferes with caching
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require_once('../../config.php');
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if (!filter_is_enabled('tex')) {
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throw new \moodle_exception('filternotenabled');
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}
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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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$status = '';
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$relativepath = get_file_argument();
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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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throw new \moodle_exception('invalidarguments', 'error');
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}
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if (!file_exists($pathname)) {
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$convertformat = get_config('filter_tex', 'convertformat');
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if (strpos($image, '.png')) {
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$convertformat = 'png';
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}
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$md5 = str_replace(".{$convertformat}", '', $image);
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if ($texcache = $DB->get_record('cache_filters', array('filter'=>'tex', 'md5key'=>$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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$density = get_config('filter_tex', 'density');
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$background = get_config('filter_tex', 'latexbackground');
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$texexp = $texcache->rawtext; // the entities are now decoded before inserting to DB
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$lateximage = $latex->render($texexp, $image, 12, $density, $background);
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if ($lateximage) {
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copy($lateximage, $pathname);
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} else {
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// failing that, use mimetex
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$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 = filter_tex_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, $image, YEARSECS, 0, false, false, '', false, [
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'cacheability' => 'public',
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'immutable' => true,
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]);
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} else {
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if (debugging()) {
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echo "The shell command<br />$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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