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Char-literal

Char-literalp

Recognizer for char-literal structures.

Signature
(char-literalp x) → *

Definitions and Theorems

Function: char-literalp

(defun char-literalp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'char-literalp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :char))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((get (std::da-nth 0 (cdr x))))
                       (unicode-charlit-char-p get))))
               (t (and (eq (car x) :escape)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 1))
                       (b* ((get (std::da-nth 0 (cdr x))))
                         (escape-sequence-p get))))))))

Theorem: consp-when-char-literalp

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