3.5 Project2: Objects

In this project you will build an object-oriented language and use it to specialize the grammar of Project1.

The particular OO language used is documented in Graham’s chapter on OO. This is a 100 lines of LISP that implements methods, class, multiple inheritance, instance creation, etc etc. Since it is written in LISP, we also get garbage collection for free.

Specially, in this specialized grammar:

• Productions have side-effects:
  • Whether or not a rewrite is cached is decided at the local production level.
  • Sounds are played as we enter some productions.
• Productions read-write to a working memory of lists of lists.
• Productions have pre-conditions that check for items in the working memory.
• Productions have post-conditions that assert items to the working memory

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