Move FA class out of Regex class

lib/imbecile/fa/state.rb

@@ -0,0 +1,51 @@
+module Imbecile
+  class FA
+
+    class State
+
+      attr_accessor :accepts
+      attr_reader :transitions
+
+      def initialize
+        @transitions = []
+      end
+
+      def add_transition(code_point_range, destination)
+        @transitions << Transition.new(code_point_range, destination)
+      end
+
+      # Determine the set of states that can be reached by nil transitions.
+      # from this state.
+      #
+      # @return [Set<NFA::State>]
+      #   Set of states.
+      def nil_transition_states
+        states = Set[self]
+        analyze_state = lambda do |state|
+          state.nil_transitions.each do |transition|
+            unless states.include?(transition.destination)
+              states << transition.destination
+              analyze_state[transition.destination]
+            end
+          end
+        end
+        analyze_state[self]
+        states
+      end
+
+      def nil_transitions
+        @transitions.select do |transition|
+          transition.nil?
+        end
+      end
+
+      def cp_transitions
+        @transitions.reject do |transition|
+          transition.nil?
+        end
+      end
+
+    end
+
+  end
+end

lib/imbecile/fa/state/transition.rb

@@ -0,0 +1,23 @@
+module Imbecile
+  class FA
+    class State
+
+      class Transition
+
+        attr_reader :code_point_range
+        attr_reader :destination
+
+        def initialize(code_point_range, destination)
+          @code_point_range = code_point_range
+          @destination = destination
+        end
+
+        def nil?
+          @code_point_range.nil?
+        end
+
+      end
+
+    end
+  end
+end