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Fsuffix

Fsuffixp

Recognizer for fsuffix structures.

Signature
(fsuffixp x) → *

Definitions and Theorems

Function: fsuffixp

(defun fsuffixp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'fsuffixp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :locase-f))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               ((eq (car x) :upcase-f)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               ((eq (car x) :locase-l)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               (t (and (eq (car x) :upcase-l)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-fsuffixp

(defthm consp-when-fsuffixp
  (implies (fsuffixp x) (consp x))
  :rule-classes :compound-recognizer)