Treat paths as strings in StrParser

2 files changed, 15 insertions, 5 deletions

diff --git a/natsort/utils.py b/natsort/utils.py
index 3832318..2bceb85 100644
--- a/natsort/utils.py
+++ b/natsort/utils.py
@@ -103,14 +103,14 @@ TupleOfStrAnyPair = Tuple[Tuple[str], TupleOfAny]
 FinalTransform = Union[TwoBlankTuple, TupleOfAny, TupleOfStrAnyPair]
 FinalTransformer = Callable[[Iterable[Any], str], FinalTransform]
 
-# For the string parsing factory
-StrSplitter = Callable[[str], Iterable[str]]
-StrParser = Callable[[str], FinalTransform]
-
 # For the path splitter
 PathArg = Union[str, PurePath]
 MatchFn = Callable[[str], Optional[Match]]
 
+# For the string parsing factory
+StrSplitter = Callable[[str], Iterable[str]]
+StrParser = Callable[[PathArg], FinalTransform]
+
 # For the path parsing factory
 PathSplitter = Callable[[PathArg], Tuple[FinalTransform, ...]]
 
@@ -493,7 +493,11 @@ def parse_string_factory(
     normalize_input = _normalize_input_factory(alg)
     compose_input = _compose_input_factory(alg) if alg & ns.LOCALEALPHA else _no_op
 
-    def func(x: str) -> FinalTransform:
+    def func(x: PathArg) -> FinalTransform:
+        if isinstance(x, PurePath):
+            # While paths are technically not strings, it is natural for them
+            # to be treated the same.
+            x = str(x)
         # Apply string input transformation function and return to x.
         # Original function is usually a no-op, but some algorithms require it
         # to also be the transformation function.
diff --git a/tests/test_natsorted.py b/tests/test_natsorted.py
index eb3aefe..1cbed83 100644
--- a/tests/test_natsorted.py
+++ b/tests/test_natsorted.py
@@ -5,6 +5,7 @@ See the README or the natsort homepage for more details.
 """
 
 from operator import itemgetter
+from pathlib import PurePosixPath
 from typing import List, Tuple, Union
 
 import pytest
@@ -84,6 +85,11 @@ def test_natsorted_can_sort_as_version_numbers() -> None:
     assert natsorted(given) == expected
 
 
+def test_natsorted_can_sorts_paths_same_as_strings() -> None:
+    paths = [PurePosixPath('a/1/something'), PurePosixPath('a/2/something'), PurePosixPath('a/10/something')]
+    assert [str(p) for p in natsorted(paths)] == natsorted([str(p) for p in paths])
+
+
 @pytest.mark.parametrize(
     "alg, expected",
     [