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• Parse-strengths

Vl-parse-optional-drive-strength

Never fails. If there's a valid drive_strength, we match it and return a vl-gatestrength-p. Otherwise, we don't do anything to the token list and just return nil.

Signature

(vl-parse-optional-drive-strength &key (tokstream 'tokstream) 
                                  (config 'config)) 
 
  → 
(mv errmsg? value new-tokstream)

Arguments

config — Guard (vl-loadconfig-p config).

Definitions and Theorems

Function: vl-parse-optional-drive-strength-fn

(defun vl-parse-optional-drive-strength-fn (tokstream config)
  (declare (xargs :stobjs (tokstream)))
  (declare (xargs :guard (vl-loadconfig-p config)))
  (declare (ignorable config))
  (let ((__function__ 'vl-parse-optional-drive-strength))
    (declare (ignorable __function__))
    (b* ((backup (vl-tokstream-save))
         ((mv erp val tokstream)
          (vl-parse-drive-strength))
         ((unless erp) (mv erp val tokstream))
         (tokstream (vl-tokstream-restore backup)))
      (mv nil nil tokstream))))

Theorem: vl-parse-optional-drive-strength-never-fails

(defthm vl-parse-optional-drive-strength-never-fails
  (not (mv-nth 0 (vl-parse-optional-drive-strength))))

Theorem: vl-parse-optional-drive-strength-result

(defthm vl-parse-optional-drive-strength-result
  (implies (and (not (mv-nth 0 (vl-parse-optional-drive-strength)))
                (and t))
           (vl-maybe-gatestrength-p
                (mv-nth 1 (vl-parse-optional-drive-strength)))))

Theorem: vl-parse-optional-drive-strength-count-strong-on-value

(defthm vl-parse-optional-drive-strength-count-strong-on-value
 (and
  (<= (vl-tokstream-measure
           :tokstream (mv-nth 2 (vl-parse-optional-drive-strength)))
      (vl-tokstream-measure))
  (implies
   (mv-nth 1 (vl-parse-optional-drive-strength))
   (< (vl-tokstream-measure
           :tokstream (mv-nth 2 (vl-parse-optional-drive-strength)))
      (vl-tokstream-measure))))
 :rule-classes ((:rewrite) (:linear)))