fr/fr_env/lib/python3.8/site-packages/skimage/io/util.py

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2021-02-17 12:26:31 +05:30
import urllib.parse
import urllib.request
from urllib.error import URLError, HTTPError
import os
import re
import tempfile
from contextlib import contextmanager
URL_REGEX = re.compile(r'http://|https://|ftp://|file://|file:\\')
def is_url(filename):
"""Return True if string is an http or ftp path."""
return (isinstance(filename, str) and
URL_REGEX.match(filename) is not None)
@contextmanager
def file_or_url_context(resource_name):
"""Yield name of file from the given resource (i.e. file or url)."""
if is_url(resource_name):
url_components = urllib.parse.urlparse(resource_name)
_, ext = os.path.splitext(url_components.path)
try:
with tempfile.NamedTemporaryFile(delete=False, suffix=ext) as f:
u = urllib.request.urlopen(resource_name)
f.write(u.read())
# f must be closed before yielding
yield f.name
except (URLError, HTTPError):
# could not open URL
os.remove(f.name)
raise
except (FileNotFoundError, FileExistsError,
PermissionError, BaseException):
# could not create temporary file
raise
else:
os.remove(f.name)
else:
yield resource_name