From db4430326a3d54f8b08cbc3de12ab061ca6a7279 Mon Sep 17 00:00:00 2001
From: anatoly techtonik <techtonik@gmail.com>
Date: Sun, 3 Mar 2013 12:05:43 +0300
Subject: [PATCH] Show generator exceptions as errors on try web page

---
 assets/js/try.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/assets/js/try.js b/assets/js/try.js
index 5977a851c..c0aab9d7c 100644
--- a/assets/js/try.js
+++ b/assets/js/try.js
@@ -44,8 +44,13 @@ function processGrammar () {
         }
     }
 
-    Jison.print = function () {};
-    parser = Jison.Generator(cfg, {type: type});
+    //Jison.print = function () {};
+    try {
+        parser = Jison.Generator(cfg, {type: type});
+    } catch(e) {
+        $("#gen_out").text("Oops. Error while parsing grammar.\n"+e).addClass('bad');
+        throw(e);
+    }
 
     $("#out").removeClass("good").removeClass("bad").html('');
     $("#gen_out").removeClass("good").removeClass("bad");