def get_dependencies(whl, version):
with zipfile.ZipFile(str(whl), "r") as zip_file:
name = "/".join([
"{}.dist-info".format("-".join(whl.name.split("-")[0:2])),
"METADATA"
])
with zip_file.open(name) as file_handler:
metadata = message_from_string(
file_handler.read().decode("utf-8"))
deps = metadata.get_all("Requires-Dist")
if deps is None:
return
for dep in deps:
req = Requirement(dep)
markers = getattr(req.marker, "_markers", tuple()) or ()
if any(m for m in markers if isinstance(m, tuple) and len(m) == 3
and m[0].value == "extra"):
continue
py_versions = WheelDownloader._marker_at(markers, "python_version")
if py_versions:
marker = Marker('python_version < "1"')
marker._markers = [
markers[ver] for ver in sorted(
list(i for i in set(py_versions)
| {i - 1
for i in py_versions} if i >= 0))
]
matches_python = marker.evaluate({"python_version": version})
if not matches_python:
continue
deleted = 0
for ver in py_versions:
deleted += WheelDownloader._del_marker_at(
markers, ver - deleted)
platforms = []
platform_positions = WheelDownloader._marker_at(
markers, "sys_platform")
deleted = 0
for pos in platform_positions: # can only be ore meaningfully
platform = "{}{}".format(markers[pos][1].value,
markers[pos][2].value)
deleted += WheelDownloader._del_marker_at(
markers, pos - deleted)
platforms.append(platform)
if not platforms:
platforms.append(None)
for platform in platforms:
yield version, platform, req
def evaluated_deps(pkg):
"Returns dependencies that apply to the current environment"
deps = []
for k, dep in pkg.get("dependencies", {}).items():
if "markers" in dep:
marker = Marker(dep["markers"])
# Remove any "extra" clauses from the marker before we evaluate it. If a package is
# in this list, the extra has already been matched.
marker._markers = remove_extra_marker(marker._markers)
try:
if not marker.evaluate():
continue
except UndefinedEnvironmentName as e:
print(f"Failed to evaluate marker for {pkg['name']}: {e}")
raise
deps.append(k)
return deps