Rename meta-message-handler to ground-message-handler

os-big-bang-example.rkt

@@ -17,7 +17,7 @@
     (define sid `(read-line-transaction ,reply-addr))
     (transition w
 		(subscribe sid
-			   (meta-message-handler w
+			   (ground-message-handler w
 			    [((read-line-evt (current-input-port) 'any) => l)
 			     (transition w
 					 (unsubscribe sid)
@@ -30,7 +30,7 @@
 (define (tick-driver self-sid interval)
   (let loop ((last-tick-time 0) (counter 0))
     (subscribe self-sid
-	       (meta-message-handler w
+	       (ground-message-handler w
 		[((time-evt (+ last-tick-time interval)) => now)
 		 (transition w
 			     (unsubscribe self-sid)

os-big-bang.rkt

@@ -16,7 +16,8 @@
 	 (struct-out on-message)
 	 (struct-out on-meta-message)
 	 message-handlers
-	 meta-message-handler
+	 meta-message-handlers
+	 ground-message-handler
 
 	 (except-out (struct-out transition) transition)
 	 (rename-out [make-transition transition])
@@ -58,16 +59,26 @@
 ;; representation of a suspended world and its active subscriptions.
 (struct world (state subscriptions) #:transparent)
 
+(define-syntax message-handlers*
+  (syntax-rules ()
+    ((_ action-constructor old-state-pattern [pattern body ...] ...)
+     (action-constructor (match-lambda [pattern #t] ... [_ #f])
+			 (lambda (message old-state)
+			   (match-define old-state-pattern old-state)
+			   (match message
+			     [pattern body ...] ...))))))
+
 (define-syntax message-handlers
   (syntax-rules ()
     ((_ old-state-pattern [pattern body ...] ...)
-     (on-message (match-lambda [pattern #t] ... [_ #f])
-		 (lambda (message old-state)
-		   (match-define old-state-pattern old-state)
-		   (match message
-		     [pattern body ...] ...))))))
+     (message-handlers* on-message old-state-pattern [pattern body ...] ...))))
 
-(define-syntax meta-message-handler
+(define-syntax meta-message-handlers
+  (syntax-rules ()
+    ((_ old-state-pattern [pattern body ...] ...)
+     (message-handlers* on-meta-message old-state-pattern [pattern body ...] ...))))
+
+(define-syntax ground-message-handler
   (syntax-rules (=>)
     ((_ old-state-pattern [(raw-pattern => pattern) body ...])
      (on-meta-message raw-pattern

universe.rkt

@@ -57,7 +57,7 @@
 							 (unsubscribe 'ticker))]))
 			  (let loop ((next-alarm-time 0))
 			    (subscribe 'ticker
-				       (meta-message-handler
+				       (ground-message-handler
 					(and w (ticker-state counter interval limit))
 					[((time-evt next-alarm-time) => now)
 					 (if (and (positive? limit) (>= counter limit))
@@ -105,7 +105,7 @@
   (list 
    (spawn (os-big-bang 'none
 		       (subscribe 'inbound-relay
-				  (meta-message-handler w
+				  (ground-message-handler w
 				   [(c:ui->world => message)
 				    (transition w (send-message message))]))
 		       (subscribe 'stopper