tools/python: sxp parser: show empty string

This patch makes the sxp parser show empty string.

Test case:
 import sxp
 sxp.show(sxp.from_string('(a "")'))
 sxp.show(sxp.from_string("(a '')"))

Without this patch:
 (a )(a )
With this patch:
 (a '')(a '')

Signed-off-by: Zhigang Wang <zhigang.x.wang@oracle.com>

diff --git a/tools/python/xen/xend/sxp.py b/tools/python/xen/xend/sxp.py
index c31f8e4d21c1517a666db1f5a6df6350a72faea4..c87270f0706934de01a3339bfb28eaa7323ff812 100644 (file)
--- a/tools/python/xen/xend/sxp.py
+++ b/tools/python/xen/xend/sxp.py
@@ -365,6 +365,8 @@ class Parser:
 def atomp(sxpr):
     """Check if an sxpr is an atom.
     """
+    if sxpr == '':
+        return 0
     if sxpr.isalnum() or sxpr == '@':
         return 1
     for c in sxpr: