lib/y_petri/transition/arcs.rb in y_petri-2.2.4 vs lib/y_petri/transition/arcs.rb in y_petri-2.3.2

@@ -13,14 +13,30 @@
   def codomain_pp; codomain.map { |p| p.name || p.object_id } end
   alias :downstream_pp :codomain_pp
 
   # Union of action arcs and test arcs.
   # 
-  def arcs; domain | codomain end
+  def arcs
+    domain | codomain
+  end
 
-  # Returns names of the (places connected to) the transition's arcs.
+  # Names of the places connected to the transition. The optional argument
+  # controls what is returned for unnamed instances, and works just like in
+  # <tt>Array#names</tt> method from <tt>y_support/name_magic</tt>:
+  # The default value (_nil_) returns _nil_, _true_ returns the instance itself,
+  # and _false_ drops the unnamed instances from the list altogether.
   # 
-  def aa; arcs.map { |p| p.name || p.object_id } end
+  def aa arg=nil
+    arcs.names arg
+  end
+
+  # Arc (a place connected to this transition) identifier.
+  # 
+  def arc id
+    place = place( id )
+    arcs.find { |p| p == place } or
+      fail TypeError, "No place #{id} connected to #{self}!"
+  end
 
   # Marking of the domain places.
   # 
   def domain_marking; domain.map &:marking end