expressionparser: revision graph

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begin using subclasses for tokens; the eventual goal is that a token class will know everything it can about what it is and the parser just knows about what tokens are
Fri, 03 Jun 2011 08:31:29 -0700, by Jeff Hammel
add a docstring
Fri, 03 Jun 2011 08:24:48 -0700, by Jeff Hammel
put tests in sseparate file
Fri, 03 Jun 2011 08:23:19 -0700, by Jeff Hammel

less more | rev 7: (0) -3 +3 tip