Improve the error message for RCSExpected exceptions.

* lib/vclib/ccvs/rcsparse/common.py (RCSExpected.__init__): Improve
  the error message passed to the base class constructor.  Also
  improve spacing around the exception class definitions.


git-svn-id: http://viewvc.tigris.org/svn/viewvc/trunk@1723 8cb11bc2-c004-0410-86c3-e597b4017df7

lib/vclib/ccvs/rcsparse/common.py

@@ -72,16 +72,26 @@ class Sink:
 
 class RCSParseError(Exception):
   pass
+
+
 class RCSIllegalCharacter(RCSParseError):
   pass
-### need more work on this one
+
+
 class RCSExpected(RCSParseError):
   def __init__(self, got, wanted):
-    RCSParseError.__init__(self, got, wanted)
+    RCSParseError.__init__(
+        self,
+        'Unexpected parsing error in RCS file.\n'
+        'Expected token: %s, but saw: %s'
+        % (wanted, got)
+        )
+
 
 class RCSStopParser(Exception):
   pass
 
+
 # --------------------------------------------------------------------------
 #
 # STANDARD TOKEN STREAM-BASED PARSER