def get_python_constraint_from_marker(
marker: BaseMarker, ) -> VersionConstraint:
from poetry.core.semver.empty_constraint import EmptyConstraint
from poetry.core.semver.helpers import parse_constraint
from poetry.core.semver.version import Version
from poetry.core.semver.version_range import VersionRange
python_marker = marker.only("python_version", "python_full_version")
if python_marker.is_any():
return VersionRange()
if python_marker.is_empty():
return EmptyConstraint()
markers = convert_markers(marker)
if contains_group_without_marker(markers, "python_version"):
# groups are in disjunctive normal form (DNF),
# an empty group means that python_version does not appear in this group,
# which means that python_version is arbitrary for this group
return VersionRange()
ors = []
for or_ in markers["python_version"]:
ands = []
for op, version in or_:
# Expand python version
if op == "==":
if "*" not in version:
version = "~" + version
op = ""
elif op == "!=":
if "*" not in version:
version += ".*"
elif op in ("<=", ">"):
parsed_version = Version.parse(version)
if parsed_version.precision == 1:
if op == "<=":
op = "<"
version = parsed_version.next_major().text
elif op == ">":
op = ">="
version = parsed_version.next_major().text
elif parsed_version.precision == 2:
if op == "<=":
op = "<"
version = parsed_version.next_minor().text
elif op == ">":
op = ">="
version = parsed_version.next_minor().text
elif op in ("in", "not in"):
versions = []
for v in re.split("[ ,]+", version):
split = v.split(".")
if len(split) in [1, 2]:
split.append("*")
op_ = "" if op == "in" else "!="
else:
op_ = "==" if op == "in" else "!="
versions.append(op_ + ".".join(split))
glue = " || " if op == "in" else ", "
if versions:
ands.append(glue.join(versions))
continue
ands.append(f"{op}{version}")
ors.append(" ".join(ands))
return parse_constraint(" || ".join(ors))
def is_valid_for_marker(self, marker: BaseMarker) -> bool:
return marker.validate(self.marker_env)