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String-literal-char

String-literal-char-p

Recognizer for string-literal-char structures.

Signature
(string-literal-char-p x) → *

Definitions and Theorems

Function: string-literal-char-p

(defun string-literal-char-p (x)
  (declare (xargs :guard t))
  (let ((__function__ 'string-literal-char-p))
    (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-stringlit-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-string-literal-char-p

(defthm consp-when-string-literal-char-p
  (implies (string-literal-char-p x)
           (consp x))
  :rule-classes :compound-recognizer)