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Escape

Escapep

Recognizer for escape structures.

Signature
(escapep x) → *

Definitions and Theorems

Function: escapep

(defun escapep (x)
  (declare (xargs :guard t))
  (and (consp x)
       (cond ((or (atom x) (eq (car x) :simple))
              (and (b* ((escape (cdr x)))
                     (simple-escapep escape))))
             ((eq (car x) :oct)
              (and (b* ((escape (cdr x)))
                     (oct-escapep escape))))
             ((eq (car x) :hex)
              (and (b* ((escape (cdr x)))
                     (hex-digit-char-listp escape))))
             (t (and (eq (car x) :univ)
                     (and)
                     (b* ((escape (cdr x)))
                       (univ-char-name-p escape)))))))

Theorem: consp-when-escapep

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