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Univ-char-name

Univ-char-name-p

Recognizer for univ-char-name structures.

Signature
(univ-char-name-p x) → *

Definitions and Theorems

Function: univ-char-name-p

(defun univ-char-name-p (x)
  (declare (xargs :guard t))
  (and (consp x)
       (cond ((or (atom x) (eq (car x) :locase-u))
              (and (b* ((quad (cdr x)))
                     (hex-quad-p quad))))
             (t (and (eq (car x) :upcase-u)
                     (and (consp (cdr x)))
                     (b* ((quad1 (car (cdr x)))
                          (quad2 (cdr (cdr x))))
                       (and (hex-quad-p quad1)
                            (hex-quad-p quad2))))))))

Theorem: consp-when-univ-char-name-p

(defthm consp-when-univ-char-name-p
  (implies (univ-char-name-p x) (consp x))
  :rule-classes :compound-recognizer)