Evaluation of source code, category theoretically?

What's the right way to think about evaluation in category theory? I'm guessing it will look kind of like this: the category will be symmetric monoidal closed and equipped with an object S whose points are "source code", together with a collection of interpreter epimorphisms run_{X, Y}: S -> [X, Y] and some notion of composition in S that works well with composition of morphisms. What are the right keywords for doing a literature search on this? -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com [For admin and other information see: http://www.mta.ca/~cat-dist/ ]