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Value-type

Value-typep

Recognizer for value-type structures.

Signature
(value-typep x) → *

Definitions and Theorems

Function: value-typep

(defun value-typep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'value-typep))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :plaintext))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 2)
                     (b* ((type (std::da-nth 0 (cdr x)))
                          (vis (std::da-nth 1 (cdr x))))
                       (and (plaintext-typep type)
                            (visibilityp vis)))))
               ((eq (car x) :record)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((name (std::da-nth 0 (cdr x))))
                       (identifierp name))))
               (t (and (eq (car x) :extrecord)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 1))
                       (b* ((loc (std::da-nth 0 (cdr x))))
                         (locatorp loc))))))))

Theorem: consp-when-value-typep

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