# 需要導入模塊: from pip import wheel [as 別名]

# 或者: from pip.wheel import Wheel [as 別名]

def from_line(cls, name, comes_from=None, prereleases=None):

"""Creates an InstallRequirement from a name, which might be a

requirement, directory containing 'setup.py', filename, or URL.

"""

url = None

name = name.strip()

req = None

path = os.path.normpath(os.path.abspath(name))

link = None

if is_url(name):

link = Link(name)

elif os.path.isdir(path) and (os.path.sep in name or name.startswith('.')):

if not is_installable_dir(path):

raise InstallationError("Directory %r is not installable. File 'setup.py' not found." % name)

link = Link(path_to_url(name))

elif is_archive_file(path):

if not os.path.isfile(path):

logger.warn('Requirement %r looks like a filename, but the file does not exist', name)

link = Link(path_to_url(name))

# If the line has an egg= definition, but isn't editable, pull the requirement out.

# Otherwise, assume the name is the req for the non URL/path/archive case.

if link and req is None:

url = link.url_without_fragment

req = link.egg_fragment #when fragment is None, this will become an 'unnamed' requirement

# Handle relative file URLs

if link.scheme == 'file' and re.search(r'\.\./', url):

url = path_to_url(os.path.normpath(os.path.abspath(link.path)))

# fail early for invalid or unsupported wheels

if link.ext == wheel_ext:

wheel = Wheel(link.filename) # can raise InvalidWheelFilename

if not wheel.supported():

raise UnsupportedWheel("%s is not a supported wheel on this platform." % wheel.filename)

else:

req = name

return cls(req, comes_from, url=url, prereleases=prereleases)