support es6 syntax in code/data editor

index.html

@@ -90,6 +90,9 @@
             <a href="https://github.com/chartjs/Chart.js">
                 <button class="indent">chartjs/Chart.js</button>
             </a>
+            <a href="https://github.com/Daniel15/babel-standalone">
+                <button class="indent">Daniel15/babel-standalone</button>
+            </a>
             <a href="https://github.com/showdownjs/showdown">
                 <button class="indent">showdownjs/showdown</button>
             </a>
@@ -147,6 +150,7 @@
 <script src="public/lib/showdown.min.js"></script>
 <script src="public/lib/ace/ace.js"></script>
 <script src="public/lib/ace/ext-language_tools.js"></script>
+<script src="public/lib/babel.min.js"></script>
 <script src="public/lib/sigma/sigma.min.js"></script>
 <script src="public/lib/sigma/plugins/sigma.plugins.dragNodes.min.js"></script>
 <script src="public/lib/Chart-2.1.3.min.js"></script>

js/editor/executor.js

@@ -9,7 +9,7 @@ const execute = (tracerManager, code, dataLines) => {
     lines.forEach((line, i) => {
       newLines.push(line.replace(/(.+\. *_wait *)(\( *\))/g, `$1(${i - dataLines})`));
     });
-    eval(newLines.join('\n'));
+    eval(Babel.transform(newLines.join('\n'), {presets: ['es2015']}).code);
     tracerManager.visualize();
   } catch (err) {
     return err;