Special subset of
(vl-parse-event-expression-fragment &key (tokstream 'tokstream) (config 'config)) → (mv errmsg? value new-tokstream)
This is similar to vl-parse-event-expression except that our
goal is to avoid ambiguity with
Function:
(defun vl-parse-event-expression-fragment-fn (tokstream config) (declare (xargs :stobjs (tokstream))) (declare (xargs :guard (vl-loadconfig-p config))) (declare (ignorable config)) (let ((__function__ 'vl-parse-event-expression-fragment)) (declare (ignorable __function__)) (seq tokstream (when (vl-is-token? :vl-lparen) (:= (vl-match)) (evatoms := (vl-parse-event-expression)) (:= (vl-match-token :vl-rparen)) (when (and (eql (len evatoms) 1) (equal (vl-evatom->type (car evatoms)) :vl-noedge)) (return-raw (vl-parse-error "Want to backtrack to treat a lone expression (foo) like a sequence expression instead of an event expression."))) (return evatoms)) (edge := (vl-match-some-token '(:vl-kwd-posedge :vl-kwd-negedge :vl-kwd-edge))) (expr := (vl-parse-expression)) (when (vl-is-token? :vl-kwd-iff) (return-raw (vl-parse-error "BOZO need to implement event_expressions with 'iff' clauses."))) (return (let ((edgetype (case (vl-token->type edge) (:vl-kwd-posedge :vl-posedge) (:vl-kwd-negedge :vl-negedge) (:vl-kwd-edge :vl-edge) (t (impossible))))) (list (vl-evatom edgetype expr)))))))
Theorem:
(defthm vl-parse-event-expression-fragment-fails-gracefully (implies (mv-nth 0 (vl-parse-event-expression-fragment)) (not (mv-nth 1 (vl-parse-event-expression-fragment)))))
Theorem:
(defthm vl-warning-p-of-vl-parse-event-expression-fragment (iff (vl-warning-p (mv-nth 0 (vl-parse-event-expression-fragment))) (mv-nth 0 (vl-parse-event-expression-fragment))))
Theorem:
(defthm vl-parse-event-expression-fragment-result (implies (and t) (vl-evatomlist-p (mv-nth 1 (vl-parse-event-expression-fragment)))))
Theorem:
(defthm vl-parse-event-expression-fragment-true-listp (true-listp (mv-nth 1 (vl-parse-event-expression-fragment))) :rule-classes :type-prescription)
Theorem:
(defthm vl-parse-event-expression-fragment-count-strong (and (<= (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-event-expression-fragment))) (vl-tokstream-measure)) (implies (not (mv-nth 0 (vl-parse-event-expression-fragment))) (< (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-event-expression-fragment))) (vl-tokstream-measure)))) :rule-classes ((:rewrite) (:linear)))
Theorem:
(defthm vl-parse-event-expression-fragment-errors-on-eof (implies (atom (vl-tokstream->tokens)) (mv-nth 0 (vl-parse-event-expression-fragment))))