A few more thoughts on the TPCL EE

What I've got in place works just fine for predefined expressions. However there are going to be issues with expressions that take a variable number of arguments (i.e. (- 1 2 3 4 5...)). That and allowing the user to put in numbers and string literals. But that's an issue that will be dealt with as I develop the editor itself. Now that I have something concrete backing up what I'm doing I'll be able to better find solutions to these issues.