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Plaintext-type

Plaintext-typep

Recognizer for plaintext-type structures.

Signature
(plaintext-typep x) → *

Definitions and Theorems

Function: plaintext-typep

(defun plaintext-typep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'plaintext-typep))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :literal))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((get (std::da-nth 0 (cdr x))))
                       (literal-typep get))))
               (t (and (eq (car x) :interface)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 1))
                       (b* ((name (std::da-nth 0 (cdr x))))
                         (identifierp name))))))))

Theorem: consp-when-plaintext-typep

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