lib/rgl/graphxml.rb in rgl-0.2.2 vs lib/rgl/graphxml.rb in rgl-0.2.3

@@ -1,52 +1,63 @@
+# graphxml.rb
+#
 # This file contains minimal support for creating RGL graphs from the GraphML
-# format (see http://www.graphdrawing.org/graphml). The main purpose is to
+# format (see http://www.graphdrawing.org/graphml).  The main purpose is to
 # have a rich set of example graphs to have some more tests.
 #
-# See the examples directory which contains a subdirectory _north_ with the
-# Graph catalog GraphViz (see http://www.research.att.com/sw/tools/graphviz/refs.html).
+# See the examples directory, which contains a subdirectory _north_ with the
+# Graph catalog GraphViz (see
+# http://www.research.att.com/sw/tools/graphviz/refs.html).
 #
 # We use REXML::StreamListener from the REXML library
 # (http://www.germane-software.com/software/rexml) to parse the grapml files.
 
 require 'rgl/mutable'
 require 'rexml/document'
 require 'rexml/streamlistener'
 
 module RGL
-  # Module GraphXML adds to each class including module MutableGraph a class
+
+  # Module GraphXML adds to each class, including module MutableGraph, a class
   # method from_graphxml.
   #
-  # Attention: Because append_features is used to provide the
-  # functionality GraphXML must be loaded before the concrete class
-  # implementing including MutableGraph is loaded.
+  # Attention: Because append_features is used to provide the functionality,
+  # GraphXML must be loaded before the concrete class including MutableGraph
+  # is loaded.
+
   module GraphXML
-	class MutableGraphParser
-	  include REXML::StreamListener
-	  attr_reader :graph
-	  def initialize(graph)
-		@graph = graph
-	  end
 
-	  def tag_start(name, attrs)
-		case name
-		when 'edge'
-		  @graph.add_edge(attrs['source'],
-						  attrs['target'])
-		when 'node'
-		  @graph.add_vertex(attrs['id'])
-		end
-	  end
-	end
-	
-	def MutableGraph.append_features(includingClass)
-	  super
+    class MutableGraphParser
 
-	  # Create a new MutableGraph from the XML-Source _source_.
-	  def includingClass.from_graphxml (source)
-		listener = MutableGraphParser.new(self.new)
-		REXML::Document.parse_stream(source, listener)
-		listener.graph
-	  end
-	end
-  end
-end
+      include REXML::StreamListener
+
+      attr_reader :graph
+
+      def initialize (graph)
+        @graph = graph
+      end
+
+      def tag_start (name, attrs)
+        case name
+        when 'edge'
+          @graph.add_edge(attrs['source'], attrs['target'])
+        when 'node'
+          @graph.add_vertex(attrs['id'])
+        end
+      end
+
+    end		# class MutableGraphParser
+        
+    def MutableGraph.append_features (includingClass)
+      super
+
+      # Create a new MutableGraph from the XML-Source _source_.
+
+      def includingClass.from_graphxml (source)
+        listener = MutableGraphParser.new(self.new)
+        REXML::Document.parse_stream(source, listener)
+        listener.graph
+      end
+    end
+
+  end                           # module GraphXML
+end                             # module RGL