lib/spread2rdf/schema/column.rb in spread2rdf-0.0.2 vs lib/spread2rdf/schema/column.rb in spread2rdf-0.1.0

@@ -7,9 +7,43 @@
           predicate:  nil,
           object:     nil,
           statement:  nil
       }
 
+      def self.normalize_attributes(values)
+        if object = values[:object]
+          case
+            when object.is_a?(Proc) then # nothing
+            when !(from = object.delete(:from_worksheet) ||
+                          object.delete(:from_sheet)).nil?
+              object[:from] = { worksheet: from.to_sym }
+            when !(from = object.delete(:from_data_source)).nil?
+              object[:from] = { data_source: resolve_data_sources(from) }
+            when !(from = object[:from]).nil?
+              case from
+                when Symbol then object[:from] = { worksheet: from }
+                when String then object[:from] = { data_source: resolve_data_sources(from) }
+                when Hash
+                  from[:data_source] = resolve_data_sources(from[:data_source]) if from.include?(:data_source)
+              end
+          end
+        end
+        values
+      end
+
+      def self.resolve_data_sources(data_sources)
+        return [data_sources] unless data_sources.is_a? Array
+        data_sources.map do |data_source|
+          case
+            when (uri = data_source).is_a?(RDF::URI) || (uri = RDF::URI.new(data_source)).valid?
+              raise NotImplementedError, "resolving of uris is not implemented yet"
+            when data_source.is_a?(String) && !(file = File.in_path(data_source)).nil?
+              RDF::Graph.load file
+            else puts "WARNING: couldn't resolve data source #{data_source}"
+          end
+        end.compact
+      end
+
       attr_reader :coord # this is set by Worksheet#index_columns!
 
       alias sheet parent
 
       def to_s