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Message

Messagep

Recognizer for message structures.

Signature
(messagep x) → *

Definitions and Theorems

Function: messagep

(defun messagep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'messagep))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :proposal))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 2)
                     (b* ((proposal (std::da-nth 0 (cdr x)))
                          (destination (std::da-nth 1 (cdr x))))
                       (and (proposalp proposal)
                            (addressp destination)))))
               ((eq (car x) :endorsement)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 2)
                     (b* ((proposal (std::da-nth 0 (cdr x)))
                          (endorser (std::da-nth 1 (cdr x))))
                       (and (proposalp proposal)
                            (addressp endorser)))))
               (t (and (eq (car x) :certificate)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 2))
                       (b* ((certificate (std::da-nth 0 (cdr x)))
                            (destination (std::da-nth 1 (cdr x))))
                         (and (certificatep certificate)
                              (addressp destination)))))))))

Theorem: consp-when-messagep

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