[tools/RDFWriter] Exclude all subclass whitespace

In hommage to the unknown DAU all whitespaces are excluded
from the custom RDF subclasses dict.

odml/tools/rdf_converter.py

@@ -4,6 +4,7 @@
 """
 
 import os
+import string
 import uuid
 import warnings
 
@@ -338,9 +339,10 @@ def _parse_custom_subclasses(self, custom_subclasses):
                                   otherwise.
         """
 
-        # Do not allow whitespaces in values
-        if " " in "".join(custom_subclasses.values()):
-            msg = "Custom RDF Subclass names must not contain any whitespaces."
+        # Do not allow any whitespace characters in values
+        vals = "".join(custom_subclasses.values()).encode()
+        if vals != vals.translate(None, string.whitespace.encode()):
+            msg = "Custom RDF Subclass names must not contain any whitespace characters."
             raise ValueError(msg)
 
         for k in custom_subclasses:

test/test_rdf_writer.py

@@ -338,7 +338,11 @@ def test_rdf_custom_subclasses(self):
         self.assertIn("odml:Cell", rdf_writer.get_rdf_str())
 
         # Test value whitespace
-        invalid_dict = {"type_1": "Class 1", "type_2": "Class 2"}
+        inval_a = "This should"
+        inval_b = "fail\nin"
+        inval_c = "the\tmost"
+        inval_d = "complete\rway"
+        invalid_dict = {"type_1": inval_a, "type_2": inval_b, "type_3": inval_c, "type_4": inval_d}
         with self.assertRaises(ValueError):
             _ = RDFWriter([doc], custom_subclasses=invalid_dict)