Apply patch for parsing of Turtle integer/literal + dot at EOF

Author: Marco De Salvo

RDFSharp.Test/Model/Serializers/RDFTurtleTest.cs

@@ -8782,6 +8782,33 @@ public void ShouldDeserializeGraphWithManyTriples()
         Assert.IsTrue(graph.ContainsTriple(new RDFTriple(new RDFResource("http://subj/"), new RDFResource("http://pred2/"), new RDFResource("http://obj2/"))));
     }
 
+    //E2E: RDF4J-5407
+
+    [TestMethod]
+    public void ShouldDeserializeTripleEndingWithDigitAndDotEOF()
+    {
+        MemoryStream stream = new MemoryStream();
+        using (StreamWriter writer = new StreamWriter(stream))
+            writer.WriteLine($"@base <{RDFNamespaceRegister.DefaultNamespace}>.{Environment.NewLine}:alice :age 30.");
+        RDFGraph graph = RDFTurtle.Deserialize(new MemoryStream(stream.ToArray()), null);
+
+        Assert.IsNotNull(graph);
+        Assert.AreEqual(1, graph.TriplesCount);
+        Assert.IsTrue(graph.ContainsTriple(new RDFTriple(new RDFResource($"{RDFNamespaceRegister.DefaultNamespace}alice"), new RDFResource($"{RDFNamespaceRegister.DefaultNamespace}age"), new RDFTypedLiteral("30", RDFModelEnums.RDFDatatypes.XSD_INTEGER))));
+    }
+    [TestMethod]
+    public void ShouldDeserializeTripleEndingWithLetterAndDotEOF()
+    {
+        MemoryStream stream = new MemoryStream();
+        using (StreamWriter writer = new StreamWriter(stream))
+            writer.WriteLine($"@base <{RDFNamespaceRegister.DefaultNamespace}>.{Environment.NewLine}:alice :age \"a\".");
+        RDFGraph graph = RDFTurtle.Deserialize(new MemoryStream(stream.ToArray()), null);
+
+        Assert.IsNotNull(graph);
+        Assert.AreEqual(1, graph.TriplesCount);
+        Assert.IsTrue(graph.ContainsTriple(new RDFTriple(new RDFResource($"{RDFNamespaceRegister.DefaultNamespace}alice"), new RDFResource($"{RDFNamespaceRegister.DefaultNamespace}age"), new RDFPlainLiteral("a"))));
+    }
+
     [TestCleanup]
     public void Cleanup()
     {

RDFSharp/Model/Serializers/RDFTurtle.cs

@@ -836,7 +836,11 @@ internal static RDFTypedLiteral ParseNumber(string turtleData, RDFTurtleContext
                 // read optional fractional digits
                 if (bufChar == '.')
                 {
-                    if (IsWhitespace(PeekCodePoint(turtleData, turtleContext)))
+                    int next = PeekCodePoint(turtleData, turtleContext);
+                    // Treat '.' as statement terminator at EOF only when we already parsed at least one digit
+                    // (e.g., "30.") or when whitespace follows. Otherwise, attempt to parse as decimal
+                    // which will surface a useful error for a stray '.' token.
+                    if ((value.Length > 0 && next == -1) || IsWhitespace(PeekCodePoint(turtleData, turtleContext)))
                     {
                         // We're parsing an integer that did not have a space before the period to end the statement
                     }