notation3.py: don't normalize float representation

rdflib/plugins/parsers/notation3.py

@@ -376,6 +376,10 @@ def unicodeExpand(m: Match) -> str:
 langcode = re.compile(r"[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*")
 
 
+class sfloat(str):
+    """ don't normalize raw XSD.double string representation """
+
+
 class SinkParser:
     def __init__(
         self,
@@ -1522,7 +1526,7 @@ def nodeOrLiteral(self, argstr: str, i: int, res: MutableSequence[Any]) -> int:
                 m = exponent_syntax.match(argstr, i)
                 if m:
                     j = m.end()
-                    res.append(float(argstr[i:j]))
+                    res.append(sfloat(argstr[i:j]))
                     return j
 
                 m = decimal_syntax.match(argstr, i)
@@ -1913,15 +1917,15 @@ def normalise(self, f: Formula | Graph | None, n: int) -> Literal: ...
     def normalise(self, f: Formula | Graph | None, n: Decimal) -> Literal: ...
 
     @overload
-    def normalise(self, f: Formula | Graph | None, n: float) -> Literal: ...
+    def normalise(self, f: Formula | Graph | None, n: sfloat) -> Literal: ...
 
     @overload
     def normalise(self, f: Formula | Graph | None, n: Node) -> Node: ...
 
     def normalise(
         self,
         f: Formula | Graph | None,
-        n: Union[tuple[int, str], bool, int, Decimal, float, Node, _AnyT],
+        n: Union[tuple[int, str], bool, int, Decimal, sfloat, Node, _AnyT],
     ) -> Union[URIRef, Literal, BNode, Node, _AnyT]:
         if isinstance(n, tuple):
             return URIRef(str(n[1]))
@@ -1941,7 +1945,7 @@ def normalise(
             s = Literal(value, datatype=DECIMAL_DATATYPE)
             return s
 
-        if isinstance(n, float):
+        if isinstance(n, sfloat):
             s = Literal(str(n), datatype=DOUBLE_DATATYPE)
             return s
 

test/test_n3.py

@@ -251,6 +251,32 @@ def test_empty_prefix(self):
             g2
         ), "Document with declared empty prefix must match default #"
 
+    def test_float_no_norm(self):
+        import rdflib
+        _ps = rdflib.NORMALIZE_LITERALS
+        try:
+            bads = []
+            for norm_lit in (True, False):
+                rdflib.NORMALIZE_LITERALS = norm_lit
+                g1 = Graph()
+                g1.parse(data=":a :b 1e10, 1e0 .", format="n3")
+                strep = [str(o) for o in g1.objects()]
+                if norm_lit:
+                    if '1e10' not in strep and '1e0' not in strep:
+                        pass
+                    else:
+                        bads.append(('NOT normalized when should have been', strep))
+                else:
+                    if '1e10' in strep and '1e0' in strep:
+                        pass
+                    else:
+                        bads.append(('normalized when it should NOT have been', strep))
+
+        finally:
+            rdflib.NORMALIZE_LITERALS = _ps
+
+        assert not bads, bads
+
 
 class TestRegularExpressions:
     def test_exponents(self):