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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)