1 files changed, 48 insertions, 0 deletions
diff --git a/displayformula.php b/displayformula.php
new file mode 100644
index 0000000..e5051e5
--- /dev/null
+++ b/displayformula.php
@@ -0,0 +1,48 @@
+<?php
+
+// Moodle algebra question type class
+// Author: Roger Moore <rwmoore 'at' ualberta.ca>
+// License: GNU Public License version 3
+    
+/**
+ * Script which converts the given formula text into LaTeX code and then 
+ * displays the appropriate image file. It relies on the LaTeX filter to
+ * be present.
+ */
+
+require_once('../../../config.php');
+require_once("$CFG->dirroot/question/type/algebra/parser.php");
+global $PAGE;
+
+$p = new qtype_algebra_parser;
+try {
+    $query=urldecode($_SERVER['QUERY_STRING']);
+    $m=array();
+    
+    if(!preg_match('/vars=([^&]*)&expr=(.*)$/A',$query,$m)) {
+        throw new Exception('Invalid query string received from http server!');
+    }
+    $vars=explode(',',$m[1]);
+    if(empty($m[2])) {
+        $texexp='';
+    } else {
+        $exp = $p->parse($m[2],$vars);
+        $texexp = '$$'.$exp->tex().'$$';
+    }
+} catch(Exception $e) {
+	$texexp = get_string('parseerror','qtype_algebra',$e->getMessage());
+}
+$formatoptions = new stdClass;
+$formatoptions->para = false;
+$PAGE->set_context(get_context_instance(CONTEXT_SYSTEM));
+$text   = format_text($texexp, FORMAT_MOODLE, $formatoptions);
+?>
+<html>
+	<head>
+		<title>Formula</title>
+		<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+	</head>
+	<body bgcolor="#FFFFFF">
+		<?php echo $text; ?>
+	</body>
+</html>