# HG changeset patch
# User Thinker K.F. Li <thinker@codemud.net>
# Date 1303098850 -28800
# Node ID c586981ecf1a5c1a32e5a9bc98b10f068f5c3793
# Parent  6927debad4ee49e796222c6d776f4eff4aa5e1d5
Avoid duplication in state names

diff -r 6927debad4ee -r c586981ecf1a pyink/domview.py
--- a/pyink/domview.py	Mon Apr 18 11:47:52 2011 +0800
+++ b/pyink/domview.py	Mon Apr 18 11:54:10 2011 +0800
@@ -445,6 +445,10 @@
         
         doc = self._comp_mgr._doc
         
+        if name in self.fsm_states:
+            raise KeyError, \
+                'Add a state with a name (%s) been used' % (name)
+        
         state = State()
         state.name = name
         self.fsm_states[name] = state