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Event

Eventp

Recognizer for event structures.

Signature
(eventp x) → *

Definitions and Theorems

Function: eventp

(defun eventp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'eventp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :create))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((certificate (std::da-nth 0 (cdr x))))
                       (certificatep certificate))))
               ((eq (car x) :accept)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((message (std::da-nth 0 (cdr x))))
                       (messagep message))))
               ((eq (car x) :advance)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((validator (std::da-nth 0 (cdr x))))
                       (addressp validator))))
               (t (and (eq (car x) :commit)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 1))
                       (b* ((validator (std::da-nth 0 (cdr x))))
                         (addressp validator))))))))

Theorem: consp-when-eventp

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