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element.pynu [ # Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
__license__ = "MIT"
try:
from collections.abc import Callable # Python 3.6
except ImportError as e:
from collections import Callable
import re
import shlex
import sys
import warnings
from bs4.dammit import EntitySubstitution
DEFAULT_OUTPUT_ENCODING = "utf-8"
PY3K = (sys.version_info[0] > 2)
whitespace_re = re.compile(r"\s+")
def _alias(attr):
"""Alias one attribute name to another for backward compatibility"""
@property
def alias(self):
return getattr(self, attr)
@alias.setter
def alias(self):
return setattr(self, attr)
return alias
class NamespacedAttribute(str):
def __new__(cls, prefix, name, namespace=None):
if name is None:
obj = str.__new__(cls, prefix)
elif prefix is None:
# Not really namespaced.
obj = str.__new__(cls, name)
else:
obj = str.__new__(cls, prefix + ":" + name)
obj.prefix = prefix
obj.name = name
obj.namespace = namespace
return obj
class AttributeValueWithCharsetSubstitution(str):
"""A stand-in object for a character encoding specified in HTML."""
class CharsetMetaAttributeValue(AttributeValueWithCharsetSubstitution):
"""A generic stand-in for the value of a meta tag's 'charset' attribute.
When Beautiful Soup parses the markup '', the
value of the 'charset' attribute will be one of these objects.
"""
def __new__(cls, original_value):
obj = str.__new__(cls, original_value)
obj.original_value = original_value
return obj
def encode(self, encoding):
return encoding
class ContentMetaAttributeValue(AttributeValueWithCharsetSubstitution):
"""A generic stand-in for the value of a meta tag's 'content' attribute.
When Beautiful Soup parses the markup:
The value of the 'content' attribute will be one of these objects.
"""
CHARSET_RE = re.compile(r"((^|;)\s*charset=)([^;]*)", re.M)
def __new__(cls, original_value):
match = cls.CHARSET_RE.search(original_value)
if match is None:
# No substitution necessary.
return str.__new__(str, original_value)
obj = str.__new__(cls, original_value)
obj.original_value = original_value
return obj
def encode(self, encoding):
def rewrite(match):
return match.group(1) + encoding
return self.CHARSET_RE.sub(rewrite, self.original_value)
class HTMLAwareEntitySubstitution(EntitySubstitution):
"""Entity substitution rules that are aware of some HTML quirks.
Specifically, the contents of
Hello, world!