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• Pseudo-term-fty

Pseudo-term-case

Case macro for pseudo-term objects.

This macro can be used to conveniently branch on the kind of a pseudo-term and access its fields. It supports the five basic kinds of pseudo-term and their fields as well as the extra pseudo-kinds :call and :const as described in pseudo-term-fty. Among them, the following examples show all the cases and all the accessors that can be used in each case.

(pseudo-term-case x
   :const (list 'quote x.val)
   :var (list 'quote (cdr (assoc x.name a)))
   :call (list x.fn (eval-list x.args a)))

(pseudo-term-case x
   :null (list 'null)
   :quote (list 'quote x.val)
   :var (list 'var x.name)
   :lambda (list 'lambda x.fn x.formals x.body x.args)
   :fncall (list 'fncall x.fn x.args))

(pseudo-term-case x
  :var nil
  :call (ground-term-listp x.args)
  :otherwise t)