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• Parse-expressions

Vl-parse-pva-tail

Match { '::' identifier [parameter_value_assignment] } '::' identifier and return an expression.

Signature

(vl-parse-pva-tail &key (tokstream 'tokstream) (config 'config)) 
  → 
(mv errmsg? value new-tokstream)

Arguments

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

Since we start by matching a ::, we always turn the identifiers into hid pieces instead of ordinary id atoms.

We don't actually support parameter value assignments within expressions yet; they'll just cause a parse error.

Definitions and Theorems

Function: vl-parse-pva-tail-fn

(defun vl-parse-pva-tail-fn (tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (let ((__function__ 'vl-parse-pva-tail))
  (declare (ignorable __function__))
  (seq
   tokstream
   (:= (vl-match-token :vl-scope))
   (head := (vl-match-token :vl-idtoken))
   (when (vl-is-token? :vl-pound)
         (:= (vl-parse-parameter-value-assignment-hack))
         (return-raw (vl-parse-error "Implement PVAs.")))
   (unless
    (vl-is-token? :vl-scope)
    (return
      (make-vl-atom
           :guts (make-vl-hidpiece :name (vl-idtoken->name head)))))
   (tail := (vl-parse-pva-tail))
   (return
    (make-vl-nonatom
     :op :vl-scope
     :args
     (list
        (make-vl-atom
             :guts (make-vl-hidpiece :name (vl-idtoken->name head)))
        tail))))))

Theorem: vl-parse-pva-tail-fails-gracefully

(defthm vl-parse-pva-tail-fails-gracefully
  (implies (mv-nth 0 (vl-parse-pva-tail))
           (not (mv-nth 1 (vl-parse-pva-tail)))))

Theorem: vl-warning-p-of-vl-parse-pva-tail

(defthm vl-warning-p-of-vl-parse-pva-tail
  (iff (vl-warning-p (mv-nth 0 (vl-parse-pva-tail)))
       (mv-nth 0 (vl-parse-pva-tail))))

Theorem: vl-parse-pva-tail-result

(defthm vl-parse-pva-tail-result
  (implies (and t)
           (equal (vl-expr-p (mv-nth 1 (vl-parse-pva-tail)))
                  (not (mv-nth 0 (vl-parse-pva-tail))))))

Theorem: vl-parse-pva-tail-count-strong

(defthm vl-parse-pva-tail-count-strong
 (and
  (<=
    (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-pva-tail)))
    (vl-tokstream-measure))
  (implies
   (not (mv-nth 0 (vl-parse-pva-tail)))
   (<
    (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-pva-tail)))
    (vl-tokstream-measure))))
 :rule-classes ((:rewrite) (:linear)))