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make complex marker unions and intersections deterministic #843

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Merged
merged 1 commit into from
Feb 28, 2025
Merged

make complex marker unions and intersections deterministic #843

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12 changes: 6 additions & 6 deletions src/poetry/core/version/markers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -734,13 +734,13 @@ def union_simplify(self, other: BaseMarker) -> BaseMarker | None:
if not shared_markers:
return None

unique_markers = our_markers - their_markers
other_unique_markers = their_markers - our_markers
# Do not use sets to create MultiMarkers for deterministic order!
unique_markers = [m for m in self.markers if m not in their_markers]
other_unique_markers = [m for m in other.markers if m not in our_markers]
unique_union = MultiMarker(*unique_markers).union(
MultiMarker(*other_unique_markers)
)
if isinstance(unique_union, (SingleMarkerLike, AnyMarker)):
# Use list instead of set for deterministic order.
common_markers = [
marker for marker in self.markers if marker in shared_markers
]
Expand Down Expand Up @@ -908,13 +908,13 @@ def intersect_simplify(self, other: BaseMarker) -> BaseMarker | None:
if not shared_markers:
return None

unique_markers = our_markers - their_markers
other_unique_markers = their_markers - our_markers
# Do not use sets to create MarkerUnions for deterministic order!
unique_markers = [m for m in self.markers if m not in their_markers]
other_unique_markers = [m for m in other.markers if m not in our_markers]
unique_intersection = MarkerUnion(*unique_markers).intersect(
MarkerUnion(*other_unique_markers)
)
if isinstance(unique_intersection, (SingleMarkerLike, EmptyMarker)):
# Use list instead of set for deterministic order.
common_markers = [
marker for marker in self.markers if marker in shared_markers
]
Expand Down
29 changes: 29 additions & 0 deletions tests/version/test_markers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2154,6 +2154,35 @@ def test_complex_intersection() -> None:
)


def test_complex_union_is_deterministic() -> None:
"""
This test might fail sporadically if marker operations are not deterministic!
"""
m1 = parse_marker(
'sys_platform != "darwin" and python_version >= "3.12"'
' and platform_system != "Emscripten" and (python_version < "4.0"'
' and sys_platform == "linux" and extra == "stretch"'
' or platform_system == "Windows" or extra == "test"'
' and sys_platform == "win32")'
)
m2 = parse_marker(
'sys_platform == "linux" and python_version >= "3.12"'
' and platform_system == "Emscripten" and python_version < "4.0"'
' and extra == "stretch" or sys_platform == "win32"'
' and python_version >= "3.12" and platform_system == "Emscripten"'
' and extra == "test"'
)
assert str(m1.union(m2)) == (
'python_version >= "3.12" and platform_system == "Windows"'
' and sys_platform != "darwin" or sys_platform == "linux"'
' and python_version >= "3.12" and python_version < "4.0"'
' and extra == "stretch" or python_version >= "3.12" and python_version < "4.0"'
' and extra == "stretch" and extra == "test" and (sys_platform == "linux"'
' or sys_platform == "win32") or sys_platform == "win32"'
' and python_version >= "3.12" and extra == "test"'
)


def test_union_avoids_combinatorial_explosion() -> None:
"""
combinatorial explosion without AtomicMultiMarker and AtomicMarkerUnion
Expand Down
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