From 82393aa9b59307a443677df7340a1dd38847a5ef Mon Sep 17 00:00:00 2001
From: Yuan-Chen Cheng <ycheng.tw@gmail.com>
Date: Fri, 25 Oct 2019 11:15:24 -0400
Subject: [PATCH] correct "JSON output format" without/with all class.

test pass on my machine.

Signed-off-by: Yuan-Chen Cheng <ycheng.tw@gmail.com>
---
 src/core/hw.cc | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/core/hw.cc b/src/core/hw.cc
index 4522c1a..8232337 100644
--- a/src/core/hw.cc
+++ b/src/core/hw.cc
@@ -1650,13 +1650,29 @@ string hwNode::asJSON(unsigned level)
     resources.clear();
   }
 
-  for (unsigned int i = 0; i < countChildren(); i++)
+  if(countChildren()>0)
   {
-    out << getChild(i)->asJSON(visible(getClassName()) ? level + 2 : 1);
-    if (visible(getChild(i)->getClassName()))
+    bool childOutputed = false;
+    for (unsigned int i = 0; i < countChildren(); i++)
     {
-      out << "," << endl;
+      string childJSON = getChild(i)->asJSON(visible(getClassName()) ? level + 2 : 1);
+      string childJSONstrip = strip(childJSON);
+      if (childJSONstrip.length() > 0)
+      {
+        if (!childOutputed)
+        {
+          if(visible(getClassName()))
+            out << "," << endl << spaces(2*level+2) << "\"children\" : [" << endl;
+        }
+        else
+          out << "," << endl;
+        childOutputed = true;
+        out << childJSON;
+      }
     }
+
+    if(visible(getClassName()) && childOutputed)
+      out << endl << spaces(2*level+2) << "]";
   }
 
   if(visible(getClassName()))
@@ -1667,7 +1683,6 @@ string hwNode::asJSON(unsigned level)
 
   if (level == 0)
   {
-    out.seekp(-2, std::ios_base::end);
     out << endl << "]" << endl;
   }