def merge_marker(requirement: Requirement, marker: str) -> None:
"""Merge the target marker str with the requirement markers"""
if not requirement.marker:
requirement.marker = Marker(marker)
return
old_marker = requirement.marker
if "or" in old_marker._markers:
new_marker = Marker(f"({old_marker}) and {marker}")
else:
new_marker = Marker(f"{old_marker} and {marker}")
requirement.marker = new_marker
def requires_extra(self) -> Dict[str, List[str]]:
"""For PKG-INFO metadata"""
if not self.optional_dependencies:
return {}
result = {}
for name, reqs in self.optional_dependencies.items():
current = result[name] = []
for r in reqs:
parsed = Requirement(r)
merge_marker(parsed, f"extra == {name!r}")
current.append(str(parsed))
return result