[Wisp-cvs] wisp/users/dig tran.py,1.32,1.33

[<di...@us...>]

Update of /cvsroot/wisp/wisp/users/dig
In directory sc8-pr-cvs1:/tmp/cvs-serv15105

Modified Files:
	tran.py 
Log Message:
introduced the Summable interface class

Index: tran.py
===================================================================
RCS file: /cvsroot/wisp/wisp/users/dig/tran.py,v
retrieving revision 1.32
retrieving revision 1.33
diff -u -d -r1.32 -r1.33
--- tran.py	22 Apr 2003 07:53:01 -0000	1.32
+++ tran.py	22 Apr 2003 10:22:21 -0000	1.33
@@ -20,6 +20,14 @@
 def abstract (this, *arg, **narg):
     raise 'abstract method was called', this
 
+class Summable (object):
+    def get_scalar (this): return 0
+    def get_dollars (this): return 0
+    def get_pos_symbols (this): return ()
+    def get_neg_symbols (this): return ()
+    def get_pos_regs (this): return ()
+    def get_neg_regs (this): return ()
+
 class Token (object): pass
 class Stackable (object):
     def contained_registers (this):