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• Example-lexer

Tokentype-p

Valid types for tokens.

This is an ordinary defenum.

Function: tokentype-p

(defun tokentype-p (x)
  (declare (xargs :guard t))
  (or (eq x ':keyword)
      (eq x ':whitespace)
      (eq x ':id)
      (eq x ':punctuation)
      (eq x ':comment)))

Theorem: type-when-tokentype-p

(defthm type-when-tokentype-p
  (implies (tokentype-p x)
           (if (symbolp x)
               (if (not (equal x 't))
                   (not (equal x 'nil))
                 'nil)
             'nil))
  :rule-classes :compound-recognizer)