parse_state_tracker.rb in rley-0.3.05

- old
+ new
@@ -1,56 +1,56 @@
-module Rley # This module is used as a namespace
-  module Parser # This module is used as a namespace
-    # Helper class that keeps track of the parse states used
-    # while a Parsing instance is constructing a parse tree.
-    class ParseStateTracker
-      # The index of the current state set
-      attr_reader(:state_set_index)
-      
-      # The current parse state
-      attr_reader(:parse_state)
-      
-      # The already processed states from current state set
-      attr_reader(:processed_states)      
-      
-      # Constructor. Refined variant of the inherited constructor.
-      def initialize(aStateSetIndex)
-        self.state_set_index = aStateSetIndex
-      end
-      
-      # Write accessor. Sets the value of the state set index
-      def state_set_index=(anIndex)
-        @state_set_index = anIndex
-        @processed_states = {}
-      end
-
-      # Write accessor. Set the given parse state as the current one.
-      def parse_state=(aParseState)
-        fail StandardError, 'Nil parse state' if aParseState.nil?
-        @parse_state = aParseState
-        processed_states[parse_state] = true
-      end
-      
-      # Take the first provided state that wasn't processed yet.
-      def select_state(theStates)
-        a_state = theStates.find { |st| !processed_states.include?(st) }
-        self.parse_state = a_state
-      end
-      
-      # The dotted item for the current parse state.
-      def curr_dotted_item()
-        parse_state.dotted_rule
-      end
-      
-      def symbol_on_left()
-        return curr_dotted_item.prev_symbol
-      end
-      
-      # Notification that one begins with the previous state set
-      def to_prev_state_set()      
-        self.state_set_index = state_set_index - 1
-      end
-    end # class
-  end # module
-end # module
-
-# End of file
+module Rley # This module is used as a namespace
+  module Parser # This module is used as a namespace
+    # Helper class that keeps track of the parse states used
+    # while a Parsing instance is constructing a parse tree.
+    class ParseStateTracker
+      # The index of the current state set
+      attr_reader(:state_set_index)
+
+      # The current parse state
+      attr_reader(:parse_state)
+
+      # The already processed states from current state set
+      attr_reader(:processed_states)
+
+      # Constructor. Refined variant of the inherited constructor.
+      def initialize(aStateSetIndex)
+        self.state_set_index = aStateSetIndex
+      end
+
+      # Write accessor. Sets the value of the state set index
+      def state_set_index=(anIndex)
+        @state_set_index = anIndex
+        @processed_states = {}
+      end
+
+      # Write accessor. Set the given parse state as the current one.
+      def parse_state=(aParseState)
+        raise StandardError, 'Nil parse state' if aParseState.nil?
+        @parse_state = aParseState
+        processed_states[parse_state] = true
+      end
+
+      # Take the first provided state that wasn't processed yet.
+      def select_state(theStates)
+        a_state = theStates.find { |st| !processed_states.include?(st) }
+        self.parse_state = a_state
+      end
+
+      # The dotted item for the current parse state.
+      def curr_dotted_item()
+        parse_state.dotted_rule
+      end
+
+      def symbol_on_left()
+        return curr_dotted_item.prev_symbol
+      end
+
+      # Notification that one begins with the previous state set
+      def to_prev_state_set()
+        self.state_set_index = state_set_index - 1
+      end
+    end # class
+  end # module
+end # module
+
+# End of file