.to_sym and #to_sym for Format, Reader and Writer, to retrieve a symb…

…ol appropriate for use with .for().

lib/rdf/format.rb

@@ -139,6 +139,16 @@ def self.file_extensions
       @@file_extensions
     end
 
+    ##
+    # Returns a symbol appropriate to use with RDF::Format.for()
+    # @return [Symbol]
+    def self.to_sym
+      elements = self.to_s.split("::")
+      sym = elements.pop
+      sym = elements.pop if sym == 'Format'
+      sym.downcase.to_s.to_sym
+    end
+
     ##
     # Retrieves or defines the reader class for this RDF serialization
     # format.

lib/rdf/reader.rb

@@ -127,6 +127,23 @@ def self.open(filename, options = {}, &block)
       end
     end
 
+    ##
+    # Returns a symbol appropriate to use with RDF::Reader.for()
+    # @return [Symbol]
+    def self.to_sym
+      elements = self.to_s.split("::")
+      sym = elements.pop
+      sym = elements.pop if sym == 'Reader'
+      sym.downcase.to_s.to_sym
+    end
+
+    ##
+    # Returns a symbol appropriate to use with RDF::Reader.for()
+    # @return [Symbol]
+    def to_sym
+      self.class.to_sym
+    end
+
     ##
     # Initializes the reader.
     #

lib/rdf/writer.rb

@@ -158,6 +158,23 @@ def self.open(filename, options = {}, &block)
       end
     end
 
+    ##
+    # Returns a symbol appropriate to use with RDF::Writer.for()
+    # @return [Symbol]
+    def self.to_sym
+      elements = self.to_s.split("::")
+      sym = elements.pop
+      sym = elements.pop if sym == 'Writer'
+      sym.downcase.to_s.to_sym
+    end
+
+    ##
+    # Returns a symbol appropriate to use with RDF::Writer.for()
+    # @return [Symbol]
+    def to_sym
+      self.class.to_sym
+    end
+
     ##
     # Initializes the writer.
     #

spec/nquads_spec.rb

@@ -23,6 +23,10 @@
     ]
     formats.each { |format| format.should == RDF::NQuads::Format }
   end
+
+  it "should return :nquads for to_sym" do
+    RDF::NQuads::Format.to_sym.should == :nquads
+  end
 end
 
 describe RDF::NQuads::Reader do
@@ -34,7 +38,6 @@
   # @see lib/rdf/spec/reader.rb in rdf-spec
   it_should_behave_like RDF_Reader
 
-
   it "should be discoverable" do
     readers = [
       RDF::Reader.for(:nquads),
@@ -45,6 +48,11 @@
     ]
     readers.each { |reader| reader.should == RDF::NQuads::Reader }
   end
+
+  it "should return :nquads for to_sym" do
+    @reader.class.to_sym.should == :nquads
+    @reader.to_sym.should == :nquads
+  end
 end
 
 describe RDF::NQuads::Writer do
@@ -60,4 +68,8 @@
     ]
     writers.each { |writer| writer.should == RDF::NQuads::Writer }
   end
+
+  it "should return :nquads for to_sym" do
+    RDF::NQuads::Writer.to_sym.should == :nquads
+  end
 end

spec/ntriples_spec.rb

@@ -22,6 +22,10 @@
     ]
     formats.each { |format| format.should == RDF::NTriples::Format }
   end
+
+  it "should return :ntriples for to_sym" do
+    RDF::NTriples::Format.to_sym.should == :ntriples
+  end
 end
 
 describe RDF::NTriples::Reader do
@@ -42,6 +46,11 @@
     ]
     readers.each { |reader| reader.should == RDF::NTriples::Reader }
   end
+
+  it "should return :ntriples for to_sym" do
+    @reader.class.to_sym.should == :ntriples
+    @reader.to_sym.should == :ntriples
+  end
 end
 
 describe RDF::NTriples::Writer do
@@ -55,6 +64,10 @@
     ]
     writers.each { |writer| writer.should == RDF::NTriples::Writer }
   end
+
+  it "should return :ntriples for to_sym" do
+    RDF::NTriples::Writer.to_sym.should == :ntriples
+  end
 end
 
 describe RDF::NTriples do