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import os
import string
import urllib.parse
import urllib.request
from typing import Optional
from .compat import WINDOWS
def get_url_scheme(url: str) -> Optional[str]:
if ":" not in url:
return None
return url.split(":", 1)[0].lower()
def path_to_url(path: str) -> str:
"""
Convert a path to a file: URL. The path will be made absolute and have
quoted path parts.
"""
path = os.path.normpath(os.path.abspath(path))
url = urllib.parse.urljoin("file:", urllib.request.pathname2url(path))
return url
def url_to_path(url: str) -> str:
"""
Convert a file: URL to a path.
"""
assert url.startswith(
"file:"
), f"You can only turn file: urls into filenames (not {url!r})"
_, netloc, path, _, _ = urllib.parse.urlsplit(url)
if not netloc or netloc == "localhost":
# According to RFC 8089, same as empty authority.
netloc = ""
elif WINDOWS:
# If we have a UNC path, prepend UNC share notation.
netloc = "\\\\" + netloc
else:
raise ValueError(
f"non-local file URIs are not supported on this platform: {url!r}"
)
path = urllib.request.url2pathname(netloc + path)
# On Windows, urlsplit parses the path as something like "/C:/Users/foo".
# This creates issues for path-related functions like io.open(), so we try
# to detect and strip the leading slash.
if (
WINDOWS
and not netloc # Not UNC.
and len(path) >= 3
and path[0] == "/" # Leading slash to strip.
and path[1] in string.ascii_letters # Drive letter.
and path[2:4] in (":", ":/") # Colon + end of string, or colon + absolute path.
):
path = path[1:]
return path