youtube-dl/youtube_dl/compat.py
Philipp Hagemeister 8c25f81bee [util] Move compatibility functions out of util
utils is large enough without these compatibility functions.

Everything that is present in newer versions of Python (i.e. with dev Python it's just an import) goes into compat.py .
Everything else (i.e. youtube-dl-specific helpers) goes into utils.py .
2014-11-02 11:23:42 +01:00

315 lines
9.9 KiB
Python

import getpass
import os
import subprocess
import sys
try:
import urllib.request as compat_urllib_request
except ImportError: # Python 2
import urllib2 as compat_urllib_request
try:
import urllib.error as compat_urllib_error
except ImportError: # Python 2
import urllib2 as compat_urllib_error
try:
import urllib.parse as compat_urllib_parse
except ImportError: # Python 2
import urllib as compat_urllib_parse
try:
from urllib.parse import urlparse as compat_urllib_parse_urlparse
except ImportError: # Python 2
from urlparse import urlparse as compat_urllib_parse_urlparse
try:
import urllib.parse as compat_urlparse
except ImportError: # Python 2
import urlparse as compat_urlparse
try:
import http.cookiejar as compat_cookiejar
except ImportError: # Python 2
import cookielib as compat_cookiejar
try:
import html.entities as compat_html_entities
except ImportError: # Python 2
import htmlentitydefs as compat_html_entities
try:
import html.parser as compat_html_parser
except ImportError: # Python 2
import HTMLParser as compat_html_parser
try:
import http.client as compat_http_client
except ImportError: # Python 2
import httplib as compat_http_client
try:
from urllib.error import HTTPError as compat_HTTPError
except ImportError: # Python 2
from urllib2 import HTTPError as compat_HTTPError
try:
from urllib.request import urlretrieve as compat_urlretrieve
except ImportError: # Python 2
from urllib import urlretrieve as compat_urlretrieve
try:
from subprocess import DEVNULL
compat_subprocess_get_DEVNULL = lambda: DEVNULL
except ImportError:
compat_subprocess_get_DEVNULL = lambda: open(os.path.devnull, 'w')
try:
from urllib.parse import unquote as compat_urllib_parse_unquote
except ImportError:
def compat_urllib_parse_unquote(string, encoding='utf-8', errors='replace'):
if string == '':
return string
res = string.split('%')
if len(res) == 1:
return string
if encoding is None:
encoding = 'utf-8'
if errors is None:
errors = 'replace'
# pct_sequence: contiguous sequence of percent-encoded bytes, decoded
pct_sequence = b''
string = res[0]
for item in res[1:]:
try:
if not item:
raise ValueError
pct_sequence += item[:2].decode('hex')
rest = item[2:]
if not rest:
# This segment was just a single percent-encoded character.
# May be part of a sequence of code units, so delay decoding.
# (Stored in pct_sequence).
continue
except ValueError:
rest = '%' + item
# Encountered non-percent-encoded characters. Flush the current
# pct_sequence.
string += pct_sequence.decode(encoding, errors) + rest
pct_sequence = b''
if pct_sequence:
# Flush the final pct_sequence
string += pct_sequence.decode(encoding, errors)
return string
try:
from urllib.parse import parse_qs as compat_parse_qs
except ImportError: # Python 2
# HACK: The following is the correct parse_qs implementation from cpython 3's stdlib.
# Python 2's version is apparently totally broken
def _parse_qsl(qs, keep_blank_values=False, strict_parsing=False,
encoding='utf-8', errors='replace'):
qs, _coerce_result = qs, unicode
pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
r = []
for name_value in pairs:
if not name_value and not strict_parsing:
continue
nv = name_value.split('=', 1)
if len(nv) != 2:
if strict_parsing:
raise ValueError("bad query field: %r" % (name_value,))
# Handle case of a control-name with no equal sign
if keep_blank_values:
nv.append('')
else:
continue
if len(nv[1]) or keep_blank_values:
name = nv[0].replace('+', ' ')
name = compat_urllib_parse_unquote(
name, encoding=encoding, errors=errors)
name = _coerce_result(name)
value = nv[1].replace('+', ' ')
value = compat_urllib_parse_unquote(
value, encoding=encoding, errors=errors)
value = _coerce_result(value)
r.append((name, value))
return r
def compat_parse_qs(qs, keep_blank_values=False, strict_parsing=False,
encoding='utf-8', errors='replace'):
parsed_result = {}
pairs = _parse_qsl(qs, keep_blank_values, strict_parsing,
encoding=encoding, errors=errors)
for name, value in pairs:
if name in parsed_result:
parsed_result[name].append(value)
else:
parsed_result[name] = [value]
return parsed_result
try:
compat_str = unicode # Python 2
except NameError:
compat_str = str
try:
compat_chr = unichr # Python 2
except NameError:
compat_chr = chr
try:
from xml.etree.ElementTree import ParseError as compat_xml_parse_error
except ImportError: # Python 2.6
from xml.parsers.expat import ExpatError as compat_xml_parse_error
try:
from shlex import quote as shlex_quote
except ImportError: # Python < 3.3
def shlex_quote(s):
return "'" + s.replace("'", "'\"'\"'") + "'"
def compat_ord(c):
if type(c) is int: return c
else: return ord(c)
if sys.version_info >= (3, 0):
compat_getenv = os.getenv
compat_expanduser = os.path.expanduser
else:
# Environment variables should be decoded with filesystem encoding.
# Otherwise it will fail if any non-ASCII characters present (see #3854 #3217 #2918)
def compat_getenv(key, default=None):
from .utils import get_filesystem_encoding
env = os.getenv(key, default)
if env:
env = env.decode(get_filesystem_encoding())
return env
# HACK: The default implementations of os.path.expanduser from cpython do not decode
# environment variables with filesystem encoding. We will work around this by
# providing adjusted implementations.
# The following are os.path.expanduser implementations from cpython 2.7.8 stdlib
# for different platforms with correct environment variables decoding.
if os.name == 'posix':
def compat_expanduser(path):
"""Expand ~ and ~user constructions. If user or $HOME is unknown,
do nothing."""
if not path.startswith('~'):
return path
i = path.find('/', 1)
if i < 0:
i = len(path)
if i == 1:
if 'HOME' not in os.environ:
import pwd
userhome = pwd.getpwuid(os.getuid()).pw_dir
else:
userhome = compat_getenv('HOME')
else:
import pwd
try:
pwent = pwd.getpwnam(path[1:i])
except KeyError:
return path
userhome = pwent.pw_dir
userhome = userhome.rstrip('/')
return (userhome + path[i:]) or '/'
elif os.name == 'nt' or os.name == 'ce':
def compat_expanduser(path):
"""Expand ~ and ~user constructs.
If user or $HOME is unknown, do nothing."""
if path[:1] != '~':
return path
i, n = 1, len(path)
while i < n and path[i] not in '/\\':
i = i + 1
if 'HOME' in os.environ:
userhome = compat_getenv('HOME')
elif 'USERPROFILE' in os.environ:
userhome = compat_getenv('USERPROFILE')
elif not 'HOMEPATH' in os.environ:
return path
else:
try:
drive = compat_getenv('HOMEDRIVE')
except KeyError:
drive = ''
userhome = os.path.join(drive, compat_getenv('HOMEPATH'))
if i != 1: #~user
userhome = os.path.join(os.path.dirname(userhome), path[1:i])
return userhome + path[i:]
else:
compat_expanduser = os.path.expanduser
if sys.version_info < (3, 0):
def compat_print(s):
from .utils import preferredencoding
print(s.encode(preferredencoding(), 'xmlcharrefreplace'))
else:
def compat_print(s):
assert type(s) == type(u'')
print(s)
try:
subprocess_check_output = subprocess.check_output
except AttributeError:
def subprocess_check_output(*args, **kwargs):
assert 'input' not in kwargs
p = subprocess.Popen(*args, stdout=subprocess.PIPE, **kwargs)
output, _ = p.communicate()
ret = p.poll()
if ret:
raise subprocess.CalledProcessError(ret, p.args, output=output)
return output
if sys.version_info < (3, 0) and sys.platform == 'win32':
def compat_getpass(prompt, *args, **kwargs):
if isinstance(prompt, compat_str):
prompt = prompt.encode(preferredencoding())
return getpass.getpass(prompt, *args, **kwargs)
else:
compat_getpass = getpass.getpass
__all__ = [
'compat_HTTPError',
'compat_chr',
'compat_cookiejar',
'compat_expanduser',
'compat_getenv',
'compat_getpass',
'compat_html_entities',
'compat_html_parser',
'compat_http_client',
'compat_ord',
'compat_parse_qs',
'compat_print',
'compat_str',
'compat_subprocess_get_DEVNULL',
'compat_urllib_error',
'compat_urllib_parse',
'compat_urllib_parse_unquote',
'compat_urllib_parse_urlparse',
'compat_urllib_request',
'compat_urlparse',
'compat_urlretrieve',
'compat_xml_parse_error',
'shlex_quote',
'subprocess_check_output',
]