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• Token

Tokenp

Recognizer for token structures.

Signature

(tokenp x) → *

Definitions and Theorems

Function: tokenp

(defun tokenp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'tokenp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :keyword))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((unwrap (std::da-nth 0 (cdr x))))
                       (stringp unwrap))))
               ((eq (car x) :ident)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((unwrap (std::da-nth 0 (cdr x))))
                       (identp unwrap))))
               ((eq (car x) :const)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((unwrap (std::da-nth 0 (cdr x))))
                       (constp unwrap))))
               ((eq (car x) :string)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((unwrap (std::da-nth 0 (cdr x))))
                       (stringlitp unwrap))))
               (t (and (eq (car x) :punctuator)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 1))
                       (b* ((unwrap (std::da-nth 0 (cdr x))))
                         (stringp unwrap))))))))

Theorem: consp-when-tokenp

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