Prevent `from_n3` from unescaping `\xhh`

This is a fairly pragmatic fix to a problem which should be solved by
changing `from_n3` to do the same as the actual n3/turtle parser.

There are still many issues with this function, some of which I added
tests for.

1 files changed, 4 insertions, 1 deletions

diff --git a/rdflib/util.py b/rdflib/util.py
index 592e896e..4f4b8296 100644
--- a/rdflib/util.py
+++ b/rdflib/util.py
@@ -137,7 +137,7 @@ def to_term(s, default=None):
         raise Exception(msg)
 
 
-def from_n3(s, default=None, backend=None, nsm=None):
+def from_n3(s: str, default=None, backend=None, nsm=None):
     r'''
     Creates the Identifier corresponding to the given n3 string.
 
@@ -193,6 +193,9 @@ def from_n3(s, default=None, backend=None, nsm=None):
                 language = rest[1:]  # strip leading at sign
 
         value = value.replace(r"\"", '"')
+        # unicode-escape interprets \xhh as an escape sequence,
+        # but n3 does not define it as such.
+        value = value.replace(r"\x", r"\\x")
         # Hack: this should correctly handle strings with either native unicode
         # characters, or \u1234 unicode escapes.
         value = value.encode("raw-unicode-escape").decode("unicode-escape")