Fix generator for ADD, MOVE, COPY (#151)

* Add failing test case for SPARQL 1.1 graph mgmt operations

The test case currently fails and will drop <http://example.com/my-graph>

* Fix sparql generator for SPARQL 1.1 update ADD, MOVE, COPY operations

Previously the generator incorrectly omitted the source graph.

Reference https://www.w3.org/TR/sparql11-update/#copy

Author: QuarksToQuasars

lib/SparqlGenerator.js

@@ -384,8 +384,8 @@ Generator.prototype.toUpdate = function (update) {
   case 'add':
   case 'copy':
   case 'move':
-    return update.type.toUpperCase() + (update.source.default ? ' DEFAULT ' : ' ') +
-           'TO ' + this.toEntity(update.destination.name);
+    return update.type.toUpperCase()+ ' ' +  (update.silent ? 'SILENT ' : '') + (update.source.default ? 'DEFAULT' : this.toEntity(update.source.name)) +
+           ' TO ' + this.toEntity(update.destination.name);
   case 'create':
   case 'clear':
   case 'drop':

test/SparqlGenerator-test.js

@@ -93,6 +93,36 @@ describe('A SPARQL generator', function () {
       'GROUP BY ?k';
     expect(generatedQuery).toEqual(expectedQuery);
   });
+
+  it('should preserve source graph in sparql 1.1 update ADD operation', function () {
+    var parser = new SparqlParser();
+    var parsedQuery = parser.parse('ADD <http://example.com/my-graph> TO <http://example.com/your-graph>');
+    var generator = new SparqlGenerator();
+    var generatedQuery = generator.stringify(parsedQuery);
+    var expectedQuery =
+      'ADD <http://example.com/my-graph> TO <http://example.com/your-graph>';
+    expect(generatedQuery).toEqual(expectedQuery);
+  });
+
+  it('should preserve source, default graph in sparql 1.1 update MOVE operation', function () {
+    var parser = new SparqlParser();
+    var parsedQuery = parser.parse('MOVE DEFAULT TO <http://example.org/named>');
+    var generator = new SparqlGenerator();
+    var generatedQuery = generator.stringify(parsedQuery);
+    var expectedQuery =
+      'MOVE DEFAULT TO <http://example.org/named>';
+    expect(generatedQuery).toEqual(expectedQuery);
+  });
+
+  it('should preserve source, default graph in sparql 1.1 update MOVE operation', function () {
+    var parser = new SparqlParser();
+    var parsedQuery = parser.parse('COPY SILENT DEFAULT TO <http://example.org/named>');
+    var generator = new SparqlGenerator();
+    var generatedQuery = generator.stringify(parsedQuery);
+    var expectedQuery =
+      'COPY SILENT DEFAULT TO <http://example.org/named>';
+    expect(generatedQuery).toEqual(expectedQuery);
+  });
 });
 
 function testQueries(directory, settings) {