Add loop label tooltip to graph with help cursor

src/js/parser/javascript/match_fragment.js

@@ -53,12 +53,19 @@ export default {
   // be matched.
   loopLabel() {
     var labelStr = this.repeat.label,
-        label, labelBox, box;
+        tooltipStr = this.repeat.tooltip,
+        label, tooltip, labelBox, box;
 
     if (labelStr) {
       label = this.container.text(0, 0, [labelStr])
         .addClass('repeat-label');
 
+      if (tooltipStr) {
+        tooltip = Snap().el('title')
+          .append(this.container.text(0, 0, tooltipStr));
+        label.append(tooltip);
+      }
+
       box = this.getBBox();
       labelBox = label.getBBox();
       label.transform(Snap.matrix().translate(

src/sass/svg.scss

@@ -50,6 +50,10 @@ circle {
   font-size: 10px;
 }
 
+.repeat-label {
+    cursor: help;
+}
+
 .subexp .subexp-label tspan,
 .charset .charset-label tspan {
   dominant-baseline: text-after-edge;