Improve #quoted? accessor for RDF::Statement, and set it when parsing embedded triples in NTriples/NQuads.

Author: gkellogg

lib/rdf/model/statement.rb

@@ -71,6 +71,7 @@ def self.from(statement, graph_name: nil, **options)
     #   @option options [RDF::Term]  :graph_name   (nil)
     #     Note, in RDF 1.1, a graph name MUST be an {Resource}.
     #   @option options [Boolean] :inferred used as a marker to record that this statement was inferred based on semantic relationships (T-Box).
+    #   @option options [Boolean] :quoted used as a marker to record that this statement quoted and appears as the subject or object of another RDF::Statement.
     #   @return [RDF::Statement]
     #
     # @overload initialize(subject, predicate, object, **options)
@@ -83,6 +84,7 @@ def self.from(statement, graph_name: nil, **options)
     #   @option options [RDF::Term]  :graph_name   (nil)
     #     Note, in RDF 1.1, a graph name MUST be an {Resource}.
     #   @option options [Boolean] :inferred used as a marker to record that this statement was inferred based on semantic relationships (T-Box).
+    #   @option options [Boolean] :quoted used as a marker to record that this statement quoted and appears as the subject or object of another RDF::Statement.
     #   @return [RDF::Statement]
     def initialize(subject = nil, predicate = nil, object = nil, options = {})
       if subject.is_a?(Hash)
@@ -209,7 +211,7 @@ def asserted?
     ##
     # @return [Boolean]
     def quoted?
-      false
+      !!@options[:quoted]
     end
 
     ##

lib/rdf/ntriples/reader.rb

@@ -255,7 +255,7 @@ def read_quotedTriple
         if !match(ST_END)
           log_error("Expected end of statement (found: #{current_line.inspect})", lineno: lineno, exception: RDF::ReaderError)
         end
-        RDF::Statement.new(subject, predicate, object)
+        RDF::Statement.new(subject, predicate, object, quoted: true)
       end
     end
 

spec/model_statement_spec.rb

@@ -186,6 +186,11 @@
     it {is_expected.to be_inferred}
   end
 
+  context "when marked as quoted" do
+    subject {RDF::Statement.new(RDF::Node.new, p, o, quoted: true)}
+    it {is_expected.to be_quoted}
+  end
+
   it {is_expected.to respond_to(:to_h)}
   its(:to_h) do
     is_expected.to eql({

spec/ntriples_spec.rb

@@ -428,21 +428,37 @@
       end
     end
 
-    statements.each do |name, st|
-      context name do
-        let(:graph) {parse(st, rdfstar: true)}
+    context "with rdfstar option" do
+      statements.each do |name, st|
+        context name do
+          let(:graph) {parse(st, rdfstar: true)}
+
+          it "creates two unquoted statements" do
+            expect(graph.count).to eql(1)
+            graph.statements.each do |stmt|
+              expect(stmt).not_to be_quoted
+            end
+          end
 
-        it "creates two statements" do
-          expect(graph.count).to eql(1)
-        end
+          it "has a statement whose subject or object is a statement" do
+            referencing = graph.statements.first
+            expect(referencing).to be_a_statement
+            if referencing.subject.statement?
+              expect(referencing.subject).to be_a_statement
+            else
+              expect(referencing.object).to be_a_statement
+            end
+          end
 
-        it "has a statement whose subject or object is a statement" do
-          referencing = graph.statements.first
-          expect(referencing).to be_a_statement
-          if referencing.subject.statement?
-            expect(referencing.subject).to be_a_statement
-          else
-            expect(referencing.object).to be_a_statement
+          it "statements which are subject or object of another statement are quoted" do
+            referencing = graph.statements.first
+            expect(referencing).to be_a_statement
+            if referencing.subject.statement?
+              expect(referencing.subject).to be_a_statement
+              expect(referencing.subject).to be_quoted
+            else
+              expect(referencing.object).to be_a_statement
+            end
           end
         end
       end