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Fsuffix

Fsuffix-kind

Get the kind (tag) of a fsuffix structure.

Signature
(fsuffix-kind x) → kind
Arguments: x — Guard (fsuffixp x).

Definitions and Theorems

Function: fsuffix-kind$inline

(defun fsuffix-kind$inline (x)
  (declare (xargs :guard (fsuffixp x)))
  (let ((__function__ 'fsuffix-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :locase-f))
                       :locase-f)
                      ((eq (car x) :upcase-f) :upcase-f)
                      ((eq (car x) :locase-l) :locase-l)
                      (t :upcase-l))
         :exec (car x))))

Theorem: fsuffix-kind-possibilities

(defthm fsuffix-kind-possibilities
  (or (equal (fsuffix-kind x) :locase-f)
      (equal (fsuffix-kind x) :upcase-f)
      (equal (fsuffix-kind x) :locase-l)
      (equal (fsuffix-kind x) :upcase-l))
  :rule-classes
  ((:forward-chaining :trigger-terms ((fsuffix-kind x)))))