813 lines
32 KiB
Python
813 lines
32 KiB
Python
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"""Beautiful Soup Elixir and Tonic - "The Screen-Scraper's Friend".
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http://www.crummy.com/software/BeautifulSoup/
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Beautiful Soup uses a pluggable XML or HTML parser to parse a
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(possibly invalid) document into a tree representation. Beautiful Soup
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provides methods and Pythonic idioms that make it easy to navigate,
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search, and modify the parse tree.
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Beautiful Soup works with Python 3.5 and up. It works better if lxml
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and/or html5lib is installed.
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For more than you ever wanted to know about Beautiful Soup, see the
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documentation: http://www.crummy.com/software/BeautifulSoup/bs4/doc/
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"""
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__author__ = "Leonard Richardson (leonardr@segfault.org)"
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__version__ = "4.11.1"
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__copyright__ = "Copyright (c) 2004-2022 Leonard Richardson"
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# Use of this source code is governed by the MIT license.
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__license__ = "MIT"
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__all__ = ['BeautifulSoup']
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from collections import Counter
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import os
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import re
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import sys
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import traceback
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import warnings
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# The very first thing we do is give a useful error if someone is
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# running this code under Python 2.
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if sys.version_info.major < 3:
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raise ImportError('You are trying to use a Python 3-specific version of Beautiful Soup under Python 2. This will not work. The final version of Beautiful Soup to support Python 2 was 4.9.3.')
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from .builder import (
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builder_registry,
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ParserRejectedMarkup,
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XMLParsedAsHTMLWarning,
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)
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from .dammit import UnicodeDammit
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from .element import (
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CData,
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Comment,
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DEFAULT_OUTPUT_ENCODING,
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Declaration,
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Doctype,
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NavigableString,
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PageElement,
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ProcessingInstruction,
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PYTHON_SPECIFIC_ENCODINGS,
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ResultSet,
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Script,
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Stylesheet,
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SoupStrainer,
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Tag,
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TemplateString,
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)
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# Define some custom warnings.
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class GuessedAtParserWarning(UserWarning):
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"""The warning issued when BeautifulSoup has to guess what parser to
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use -- probably because no parser was specified in the constructor.
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"""
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class MarkupResemblesLocatorWarning(UserWarning):
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"""The warning issued when BeautifulSoup is given 'markup' that
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actually looks like a resource locator -- a URL or a path to a file
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on disk.
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"""
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class BeautifulSoup(Tag):
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"""A data structure representing a parsed HTML or XML document.
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Most of the methods you'll call on a BeautifulSoup object are inherited from
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PageElement or Tag.
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Internally, this class defines the basic interface called by the
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tree builders when converting an HTML/XML document into a data
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structure. The interface abstracts away the differences between
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parsers. To write a new tree builder, you'll need to understand
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these methods as a whole.
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These methods will be called by the BeautifulSoup constructor:
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* reset()
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* feed(markup)
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The tree builder may call these methods from its feed() implementation:
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* handle_starttag(name, attrs) # See note about return value
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* handle_endtag(name)
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* handle_data(data) # Appends to the current data node
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* endData(containerClass) # Ends the current data node
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No matter how complicated the underlying parser is, you should be
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able to build a tree using 'start tag' events, 'end tag' events,
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'data' events, and "done with data" events.
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If you encounter an empty-element tag (aka a self-closing tag,
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like HTML's <br> tag), call handle_starttag and then
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handle_endtag.
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"""
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# Since BeautifulSoup subclasses Tag, it's possible to treat it as
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# a Tag with a .name. This name makes it clear the BeautifulSoup
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# object isn't a real markup tag.
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ROOT_TAG_NAME = '[document]'
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# If the end-user gives no indication which tree builder they
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# want, look for one with these features.
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DEFAULT_BUILDER_FEATURES = ['html', 'fast']
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# A string containing all ASCII whitespace characters, used in
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# endData() to detect data chunks that seem 'empty'.
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ASCII_SPACES = '\x20\x0a\x09\x0c\x0d'
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NO_PARSER_SPECIFIED_WARNING = "No parser was explicitly specified, so I'm using the best available %(markup_type)s parser for this system (\"%(parser)s\"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.\n\nThe code that caused this warning is on line %(line_number)s of the file %(filename)s. To get rid of this warning, pass the additional argument 'features=\"%(parser)s\"' to the BeautifulSoup constructor.\n"
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def __init__(self, markup="", features=None, builder=None,
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parse_only=None, from_encoding=None, exclude_encodings=None,
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element_classes=None, **kwargs):
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"""Constructor.
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:param markup: A string or a file-like object representing
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markup to be parsed.
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:param features: Desirable features of the parser to be
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used. This may be the name of a specific parser ("lxml",
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"lxml-xml", "html.parser", or "html5lib") or it may be the
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type of markup to be used ("html", "html5", "xml"). It's
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recommended that you name a specific parser, so that
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Beautiful Soup gives you the same results across platforms
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and virtual environments.
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:param builder: A TreeBuilder subclass to instantiate (or
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instance to use) instead of looking one up based on
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`features`. You only need to use this if you've implemented a
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custom TreeBuilder.
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:param parse_only: A SoupStrainer. Only parts of the document
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matching the SoupStrainer will be considered. This is useful
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when parsing part of a document that would otherwise be too
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large to fit into memory.
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:param from_encoding: A string indicating the encoding of the
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document to be parsed. Pass this in if Beautiful Soup is
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guessing wrongly about the document's encoding.
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:param exclude_encodings: A list of strings indicating
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encodings known to be wrong. Pass this in if you don't know
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the document's encoding but you know Beautiful Soup's guess is
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wrong.
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:param element_classes: A dictionary mapping BeautifulSoup
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classes like Tag and NavigableString, to other classes you'd
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like to be instantiated instead as the parse tree is
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built. This is useful for subclassing Tag or NavigableString
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to modify default behavior.
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:param kwargs: For backwards compatibility purposes, the
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constructor accepts certain keyword arguments used in
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Beautiful Soup 3. None of these arguments do anything in
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Beautiful Soup 4; they will result in a warning and then be
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ignored.
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Apart from this, any keyword arguments passed into the
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BeautifulSoup constructor are propagated to the TreeBuilder
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constructor. This makes it possible to configure a
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TreeBuilder by passing in arguments, not just by saying which
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one to use.
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"""
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if 'convertEntities' in kwargs:
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del kwargs['convertEntities']
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warnings.warn(
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"BS4 does not respect the convertEntities argument to the "
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"BeautifulSoup constructor. Entities are always converted "
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"to Unicode characters.")
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if 'markupMassage' in kwargs:
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del kwargs['markupMassage']
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warnings.warn(
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"BS4 does not respect the markupMassage argument to the "
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"BeautifulSoup constructor. The tree builder is responsible "
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"for any necessary markup massage.")
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if 'smartQuotesTo' in kwargs:
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del kwargs['smartQuotesTo']
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warnings.warn(
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"BS4 does not respect the smartQuotesTo argument to the "
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"BeautifulSoup constructor. Smart quotes are always converted "
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"to Unicode characters.")
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if 'selfClosingTags' in kwargs:
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del kwargs['selfClosingTags']
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warnings.warn(
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"BS4 does not respect the selfClosingTags argument to the "
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"BeautifulSoup constructor. The tree builder is responsible "
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"for understanding self-closing tags.")
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if 'isHTML' in kwargs:
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del kwargs['isHTML']
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warnings.warn(
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"BS4 does not respect the isHTML argument to the "
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"BeautifulSoup constructor. Suggest you use "
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"features='lxml' for HTML and features='lxml-xml' for "
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"XML.")
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def deprecated_argument(old_name, new_name):
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if old_name in kwargs:
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warnings.warn(
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'The "%s" argument to the BeautifulSoup constructor '
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'has been renamed to "%s."' % (old_name, new_name),
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DeprecationWarning
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)
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return kwargs.pop(old_name)
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return None
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parse_only = parse_only or deprecated_argument(
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"parseOnlyThese", "parse_only")
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from_encoding = from_encoding or deprecated_argument(
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"fromEncoding", "from_encoding")
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if from_encoding and isinstance(markup, str):
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warnings.warn("You provided Unicode markup but also provided a value for from_encoding. Your from_encoding will be ignored.")
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from_encoding = None
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self.element_classes = element_classes or dict()
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# We need this information to track whether or not the builder
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# was specified well enough that we can omit the 'you need to
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# specify a parser' warning.
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original_builder = builder
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original_features = features
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if isinstance(builder, type):
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# A builder class was passed in; it needs to be instantiated.
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builder_class = builder
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builder = None
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elif builder is None:
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if isinstance(features, str):
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features = [features]
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if features is None or len(features) == 0:
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features = self.DEFAULT_BUILDER_FEATURES
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builder_class = builder_registry.lookup(*features)
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if builder_class is None:
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raise FeatureNotFound(
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"Couldn't find a tree builder with the features you "
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"requested: %s. Do you need to install a parser library?"
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% ",".join(features))
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# At this point either we have a TreeBuilder instance in
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# builder, or we have a builder_class that we can instantiate
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# with the remaining **kwargs.
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if builder is None:
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builder = builder_class(**kwargs)
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if not original_builder and not (
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original_features == builder.NAME or
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original_features in builder.ALTERNATE_NAMES
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) and markup:
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# The user did not tell us which TreeBuilder to use,
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# and we had to guess. Issue a warning.
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if builder.is_xml:
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markup_type = "XML"
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else:
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markup_type = "HTML"
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# This code adapted from warnings.py so that we get the same line
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# of code as our warnings.warn() call gets, even if the answer is wrong
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# (as it may be in a multithreading situation).
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caller = None
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try:
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caller = sys._getframe(1)
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except ValueError:
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pass
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if caller:
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globals = caller.f_globals
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line_number = caller.f_lineno
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else:
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globals = sys.__dict__
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line_number= 1
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filename = globals.get('__file__')
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if filename:
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fnl = filename.lower()
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if fnl.endswith((".pyc", ".pyo")):
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filename = filename[:-1]
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if filename:
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# If there is no filename at all, the user is most likely in a REPL,
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# and the warning is not necessary.
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values = dict(
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filename=filename,
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line_number=line_number,
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parser=builder.NAME,
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markup_type=markup_type
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)
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warnings.warn(
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self.NO_PARSER_SPECIFIED_WARNING % values,
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GuessedAtParserWarning, stacklevel=2
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)
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else:
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if kwargs:
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warnings.warn("Keyword arguments to the BeautifulSoup constructor will be ignored. These would normally be passed into the TreeBuilder constructor, but a TreeBuilder instance was passed in as `builder`.")
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self.builder = builder
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self.is_xml = builder.is_xml
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self.known_xml = self.is_xml
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self._namespaces = dict()
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self.parse_only = parse_only
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if hasattr(markup, 'read'): # It's a file-type object.
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markup = markup.read()
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elif len(markup) <= 256 and (
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(isinstance(markup, bytes) and not b'<' in markup)
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or (isinstance(markup, str) and not '<' in markup)
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):
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# Issue warnings for a couple beginner problems
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# involving passing non-markup to Beautiful Soup.
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# Beautiful Soup will still parse the input as markup,
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# since that is sometimes the intended behavior.
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if not self._markup_is_url(markup):
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self._markup_resembles_filename(markup)
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rejections = []
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success = False
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for (self.markup, self.original_encoding, self.declared_html_encoding,
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self.contains_replacement_characters) in (
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self.builder.prepare_markup(
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markup, from_encoding, exclude_encodings=exclude_encodings)):
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self.reset()
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self.builder.initialize_soup(self)
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try:
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self._feed()
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success = True
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break
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except ParserRejectedMarkup as e:
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rejections.append(e)
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pass
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if not success:
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other_exceptions = [str(e) for e in rejections]
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raise ParserRejectedMarkup(
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"The markup you provided was rejected by the parser. Trying a different parser or a different encoding may help.\n\nOriginal exception(s) from parser:\n " + "\n ".join(other_exceptions)
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)
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# Clear out the markup and remove the builder's circular
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# reference to this object.
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self.markup = None
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self.builder.soup = None
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def __copy__(self):
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"""Copy a BeautifulSoup object by converting the document to a string and parsing it again."""
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copy = type(self)(
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self.encode('utf-8'), builder=self.builder, from_encoding='utf-8'
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)
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# Although we encoded the tree to UTF-8, that may not have
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# been the encoding of the original markup. Set the copy's
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# .original_encoding to reflect the original object's
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# .original_encoding.
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copy.original_encoding = self.original_encoding
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return copy
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def __getstate__(self):
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# Frequently a tree builder can't be pickled.
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d = dict(self.__dict__)
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|
|
if 'builder' in d and d['builder'] is not None and not self.builder.picklable:
|
||
|
|
d['builder'] = None
|
||
|
|
return d
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _decode_markup(cls, markup):
|
||
|
|
"""Ensure `markup` is bytes so it's safe to send into warnings.warn.
|
||
|
|
|
||
|
|
TODO: warnings.warn had this problem back in 2010 but it might not
|
||
|
|
anymore.
|
||
|
|
"""
|
||
|
|
if isinstance(markup, bytes):
|
||
|
|
decoded = markup.decode('utf-8', 'replace')
|
||
|
|
else:
|
||
|
|
decoded = markup
|
||
|
|
return decoded
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _markup_is_url(cls, markup):
|
||
|
|
"""Error-handling method to raise a warning if incoming markup looks
|
||
|
|
like a URL.
|
||
|
|
|
||
|
|
:param markup: A string.
|
||
|
|
:return: Whether or not the markup resembles a URL
|
||
|
|
closely enough to justify a warning.
|
||
|
|
"""
|
||
|
|
if isinstance(markup, bytes):
|
||
|
|
space = b' '
|
||
|
|
cant_start_with = (b"http:", b"https:")
|
||
|
|
elif isinstance(markup, str):
|
||
|
|
space = ' '
|
||
|
|
cant_start_with = ("http:", "https:")
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
if any(markup.startswith(prefix) for prefix in cant_start_with):
|
||
|
|
if not space in markup:
|
||
|
|
warnings.warn(
|
||
|
|
'The input looks more like a URL than markup. You may want to use'
|
||
|
|
' an HTTP client like requests to get the document behind'
|
||
|
|
' the URL, and feed that document to Beautiful Soup.',
|
||
|
|
MarkupResemblesLocatorWarning
|
||
|
|
)
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _markup_resembles_filename(cls, markup):
|
||
|
|
"""Error-handling method to raise a warning if incoming markup
|
||
|
|
resembles a filename.
|
||
|
|
|
||
|
|
:param markup: A bytestring or string.
|
||
|
|
:return: Whether or not the markup resembles a filename
|
||
|
|
closely enough to justify a warning.
|
||
|
|
"""
|
||
|
|
path_characters = '/\\'
|
||
|
|
extensions = ['.html', '.htm', '.xml', '.xhtml', '.txt']
|
||
|
|
if isinstance(markup, bytes):
|
||
|
|
path_characters = path_characters.encode("utf8")
|
||
|
|
extensions = [x.encode('utf8') for x in extensions]
|
||
|
|
filelike = False
|
||
|
|
if any(x in markup for x in path_characters):
|
||
|
|
filelike = True
|
||
|
|
else:
|
||
|
|
lower = markup.lower()
|
||
|
|
if any(lower.endswith(ext) for ext in extensions):
|
||
|
|
filelike = True
|
||
|
|
if filelike:
|
||
|
|
warnings.warn(
|
||
|
|
'The input looks more like a filename than markup. You may'
|
||
|
|
' want to open this file and pass the filehandle into'
|
||
|
|
' Beautiful Soup.',
|
||
|
|
MarkupResemblesLocatorWarning
|
||
|
|
)
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
def _feed(self):
|
||
|
|
"""Internal method that parses previously set markup, creating a large
|
||
|
|
number of Tag and NavigableString objects.
|
||
|
|
"""
|
||
|
|
# Convert the document to Unicode.
|
||
|
|
self.builder.reset()
|
||
|
|
|
||
|
|
self.builder.feed(self.markup)
|
||
|
|
# Close out any unfinished strings and close all the open tags.
|
||
|
|
self.endData()
|
||
|
|
while self.currentTag.name != self.ROOT_TAG_NAME:
|
||
|
|
self.popTag()
|
||
|
|
|
||
|
|
def reset(self):
|
||
|
|
"""Reset this object to a state as though it had never parsed any
|
||
|
|
markup.
|
||
|
|
"""
|
||
|
|
Tag.__init__(self, self, self.builder, self.ROOT_TAG_NAME)
|
||
|
|
self.hidden = 1
|
||
|
|
self.builder.reset()
|
||
|
|
self.current_data = []
|
||
|
|
self.currentTag = None
|
||
|
|
self.tagStack = []
|
||
|
|
self.open_tag_counter = Counter()
|
||
|
|
self.preserve_whitespace_tag_stack = []
|
||
|
|
self.string_container_stack = []
|
||
|
|
self.pushTag(self)
|
||
|
|
|
||
|
|
def new_tag(self, name, namespace=None, nsprefix=None, attrs={},
|
||
|
|
sourceline=None, sourcepos=None, **kwattrs):
|
||
|
|
"""Create a new Tag associated with this BeautifulSoup object.
|
||
|
|
|
||
|
|
:param name: The name of the new Tag.
|
||
|
|
:param namespace: The URI of the new Tag's XML namespace, if any.
|
||
|
|
:param prefix: The prefix for the new Tag's XML namespace, if any.
|
||
|
|
:param attrs: A dictionary of this Tag's attribute values; can
|
||
|
|
be used instead of `kwattrs` for attributes like 'class'
|
||
|
|
that are reserved words in Python.
|
||
|
|
:param sourceline: The line number where this tag was
|
||
|
|
(purportedly) found in its source document.
|
||
|
|
:param sourcepos: The character position within `sourceline` where this
|
||
|
|
tag was (purportedly) found.
|
||
|
|
:param kwattrs: Keyword arguments for the new Tag's attribute values.
|
||
|
|
|
||
|
|
"""
|
||
|
|
kwattrs.update(attrs)
|
||
|
|
return self.element_classes.get(Tag, Tag)(
|
||
|
|
None, self.builder, name, namespace, nsprefix, kwattrs,
|
||
|
|
sourceline=sourceline, sourcepos=sourcepos
|
||
|
|
)
|
||
|
|
|
||
|
|
def string_container(self, base_class=None):
|
||
|
|
container = base_class or NavigableString
|
||
|
|
|
||
|
|
# There may be a general override of NavigableString.
|
||
|
|
container = self.element_classes.get(
|
||
|
|
container, container
|
||
|
|
)
|
||
|
|
|
||
|
|
# On top of that, we may be inside a tag that needs a special
|
||
|
|
# container class.
|
||
|
|
if self.string_container_stack and container is NavigableString:
|
||
|
|
container = self.builder.string_containers.get(
|
||
|
|
self.string_container_stack[-1].name, container
|
||
|
|
)
|
||
|
|
return container
|
||
|
|
|
||
|
|
def new_string(self, s, subclass=None):
|
||
|
|
"""Create a new NavigableString associated with this BeautifulSoup
|
||
|
|
object.
|
||
|
|
"""
|
||
|
|
container = self.string_container(subclass)
|
||
|
|
return container(s)
|
||
|
|
|
||
|
|
def insert_before(self, *args):
|
||
|
|
"""This method is part of the PageElement API, but `BeautifulSoup` doesn't implement
|
||
|
|
it because there is nothing before or after it in the parse tree.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError("BeautifulSoup objects don't support insert_before().")
|
||
|
|
|
||
|
|
def insert_after(self, *args):
|
||
|
|
"""This method is part of the PageElement API, but `BeautifulSoup` doesn't implement
|
||
|
|
it because there is nothing before or after it in the parse tree.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError("BeautifulSoup objects don't support insert_after().")
|
||
|
|
|
||
|
|
def popTag(self):
|
||
|
|
"""Internal method called by _popToTag when a tag is closed."""
|
||
|
|
tag = self.tagStack.pop()
|
||
|
|
if tag.name in self.open_tag_counter:
|
||
|
|
self.open_tag_counter[tag.name] -= 1
|
||
|
|
if self.preserve_whitespace_tag_stack and tag == self.preserve_whitespace_tag_stack[-1]:
|
||
|
|
self.preserve_whitespace_tag_stack.pop()
|
||
|
|
if self.string_container_stack and tag == self.string_container_stack[-1]:
|
||
|
|
self.string_container_stack.pop()
|
||
|
|
#print("Pop", tag.name)
|
||
|
|
if self.tagStack:
|
||
|
|
self.currentTag = self.tagStack[-1]
|
||
|
|
return self.currentTag
|
||
|
|
|
||
|
|
def pushTag(self, tag):
|
||
|
|
"""Internal method called by handle_starttag when a tag is opened."""
|
||
|
|
#print("Push", tag.name)
|
||
|
|
if self.currentTag is not None:
|
||
|
|
self.currentTag.contents.append(tag)
|
||
|
|
self.tagStack.append(tag)
|
||
|
|
self.currentTag = self.tagStack[-1]
|
||
|
|
if tag.name != self.ROOT_TAG_NAME:
|
||
|
|
self.open_tag_counter[tag.name] += 1
|
||
|
|
if tag.name in self.builder.preserve_whitespace_tags:
|
||
|
|
self.preserve_whitespace_tag_stack.append(tag)
|
||
|
|
if tag.name in self.builder.string_containers:
|
||
|
|
self.string_container_stack.append(tag)
|
||
|
|
|
||
|
|
def endData(self, containerClass=None):
|
||
|
|
"""Method called by the TreeBuilder when the end of a data segment
|
||
|
|
occurs.
|
||
|
|
"""
|
||
|
|
if self.current_data:
|
||
|
|
current_data = ''.join(self.current_data)
|
||
|
|
# If whitespace is not preserved, and this string contains
|
||
|
|
# nothing but ASCII spaces, replace it with a single space
|
||
|
|
# or newline.
|
||
|
|
if not self.preserve_whitespace_tag_stack:
|
||
|
|
strippable = True
|
||
|
|
for i in current_data:
|
||
|
|
if i not in self.ASCII_SPACES:
|
||
|
|
strippable = False
|
||
|
|
break
|
||
|
|
if strippable:
|
||
|
|
if '\n' in current_data:
|
||
|
|
current_data = '\n'
|
||
|
|
else:
|
||
|
|
current_data = ' '
|
||
|
|
|
||
|
|
# Reset the data collector.
|
||
|
|
self.current_data = []
|
||
|
|
|
||
|
|
# Should we add this string to the tree at all?
|
||
|
|
if self.parse_only and len(self.tagStack) <= 1 and \
|
||
|
|
(not self.parse_only.text or \
|
||
|
|
not self.parse_only.search(current_data)):
|
||
|
|
return
|
||
|
|
|
||
|
|
containerClass = self.string_container(containerClass)
|
||
|
|
o = containerClass(current_data)
|
||
|
|
self.object_was_parsed(o)
|
||
|
|
|
||
|
|
def object_was_parsed(self, o, parent=None, most_recent_element=None):
|
||
|
|
"""Method called by the TreeBuilder to integrate an object into the parse tree."""
|
||
|
|
if parent is None:
|
||
|
|
parent = self.currentTag
|
||
|
|
if most_recent_element is not None:
|
||
|
|
previous_element = most_recent_element
|
||
|
|
else:
|
||
|
|
previous_element = self._most_recent_element
|
||
|
|
|
||
|
|
next_element = previous_sibling = next_sibling = None
|
||
|
|
if isinstance(o, Tag):
|
||
|
|
next_element = o.next_element
|
||
|
|
next_sibling = o.next_sibling
|
||
|
|
previous_sibling = o.previous_sibling
|
||
|
|
if previous_element is None:
|
||
|
|
previous_element = o.previous_element
|
||
|
|
|
||
|
|
fix = parent.next_element is not None
|
||
|
|
|
||
|
|
o.setup(parent, previous_element, next_element, previous_sibling, next_sibling)
|
||
|
|
|
||
|
|
self._most_recent_element = o
|
||
|
|
parent.contents.append(o)
|
||
|
|
|
||
|
|
# Check if we are inserting into an already parsed node.
|
||
|
|
if fix:
|
||
|
|
self._linkage_fixer(parent)
|
||
|
|
|
||
|
|
def _linkage_fixer(self, el):
|
||
|
|
"""Make sure linkage of this fragment is sound."""
|
||
|
|
|
||
|
|
first = el.contents[0]
|
||
|
|
child = el.contents[-1]
|
||
|
|
descendant = child
|
||
|
|
|
||
|
|
if child is first and el.parent is not None:
|
||
|
|
# Parent should be linked to first child
|
||
|
|
el.next_element = child
|
||
|
|
# We are no longer linked to whatever this element is
|
||
|
|
prev_el = child.previous_element
|
||
|
|
if prev_el is not None and prev_el is not el:
|
||
|
|
prev_el.next_element = None
|
||
|
|
# First child should be linked to the parent, and no previous siblings.
|
||
|
|
child.previous_element = el
|
||
|
|
child.previous_sibling = None
|
||
|
|
|
||
|
|
# We have no sibling as we've been appended as the last.
|
||
|
|
child.next_sibling = None
|
||
|
|
|
||
|
|
# This index is a tag, dig deeper for a "last descendant"
|
||
|
|
if isinstance(child, Tag) and child.contents:
|
||
|
|
descendant = child._last_descendant(False)
|
||
|
|
|
||
|
|
# As the final step, link last descendant. It should be linked
|
||
|
|
# to the parent's next sibling (if found), else walk up the chain
|
||
|
|
# and find a parent with a sibling. It should have no next sibling.
|
||
|
|
descendant.next_element = None
|
||
|
|
descendant.next_sibling = None
|
||
|
|
target = el
|
||
|
|
while True:
|
||
|
|
if target is None:
|
||
|
|
break
|
||
|
|
elif target.next_sibling is not None:
|
||
|
|
descendant.next_element = target.next_sibling
|
||
|
|
target.next_sibling.previous_element = child
|
||
|
|
break
|
||
|
|
target = target.parent
|
||
|
|
|
||
|
|
def _popToTag(self, name, nsprefix=None, inclusivePop=True):
|
||
|
|
"""Pops the tag stack up to and including the most recent
|
||
|
|
instance of the given tag.
|
||
|
|
|
||
|
|
If there are no open tags with the given name, nothing will be
|
||
|
|
popped.
|
||
|
|
|
||
|
|
:param name: Pop up to the most recent tag with this name.
|
||
|
|
:param nsprefix: The namespace prefix that goes with `name`.
|
||
|
|
:param inclusivePop: It this is false, pops the tag stack up
|
||
|
|
to but *not* including the most recent instqance of the
|
||
|
|
given tag.
|
||
|
|
|
||
|
|
"""
|
||
|
|
#print("Popping to %s" % name)
|
||
|
|
if name == self.ROOT_TAG_NAME:
|
||
|
|
# The BeautifulSoup object itself can never be popped.
|
||
|
|
return
|
||
|
|
|
||
|
|
most_recently_popped = None
|
||
|
|
|
||
|
|
stack_size = len(self.tagStack)
|
||
|
|
for i in range(stack_size - 1, 0, -1):
|
||
|
|
if not self.open_tag_counter.get(name):
|
||
|
|
break
|
||
|
|
t = self.tagStack[i]
|
||
|
|
if (name == t.name and nsprefix == t.prefix):
|
||
|
|
if inclusivePop:
|
||
|
|
most_recently_popped = self.popTag()
|
||
|
|
break
|
||
|
|
most_recently_popped = self.popTag()
|
||
|
|
|
||
|
|
return most_recently_popped
|
||
|
|
|
||
|
|
def handle_starttag(self, name, namespace, nsprefix, attrs, sourceline=None,
|
||
|
|
sourcepos=None, namespaces=None):
|
||
|
|
"""Called by the tree builder when a new tag is encountered.
|
||
|
|
|
||
|
|
:param name: Name of the tag.
|
||
|
|
:param nsprefix: Namespace prefix for the tag.
|
||
|
|
:param attrs: A dictionary of attribute values.
|
||
|
|
:param sourceline: The line number where this tag was found in its
|
||
|
|
source document.
|
||
|
|
:param sourcepos: The character position within `sourceline` where this
|
||
|
|
tag was found.
|
||
|
|
:param namespaces: A dictionary of all namespace prefix mappings
|
||
|
|
currently in scope in the document.
|
||
|
|
|
||
|
|
If this method returns None, the tag was rejected by an active
|
||
|
|
SoupStrainer. You should proceed as if the tag had not occurred
|
||
|
|
in the document. For instance, if this was a self-closing tag,
|
||
|
|
don't call handle_endtag.
|
||
|
|
"""
|
||
|
|
# print("Start tag %s: %s" % (name, attrs))
|
||
|
|
self.endData()
|
||
|
|
|
||
|
|
if (self.parse_only and len(self.tagStack) <= 1
|
||
|
|
and (self.parse_only.text
|
||
|
|
or not self.parse_only.search_tag(name, attrs))):
|
||
|
|
return None
|
||
|
|
|
||
|
|
tag = self.element_classes.get(Tag, Tag)(
|
||
|
|
self, self.builder, name, namespace, nsprefix, attrs,
|
||
|
|
self.currentTag, self._most_recent_element,
|
||
|
|
sourceline=sourceline, sourcepos=sourcepos,
|
||
|
|
namespaces=namespaces
|
||
|
|
)
|
||
|
|
if tag is None:
|
||
|
|
return tag
|
||
|
|
if self._most_recent_element is not None:
|
||
|
|
self._most_recent_element.next_element = tag
|
||
|
|
self._most_recent_element = tag
|
||
|
|
self.pushTag(tag)
|
||
|
|
return tag
|
||
|
|
|
||
|
|
def handle_endtag(self, name, nsprefix=None):
|
||
|
|
"""Called by the tree builder when an ending tag is encountered.
|
||
|
|
|
||
|
|
:param name: Name of the tag.
|
||
|
|
:param nsprefix: Namespace prefix for the tag.
|
||
|
|
"""
|
||
|
|
#print("End tag: " + name)
|
||
|
|
self.endData()
|
||
|
|
self._popToTag(name, nsprefix)
|
||
|
|
|
||
|
|
def handle_data(self, data):
|
||
|
|
"""Called by the tree builder when a chunk of textual data is encountered."""
|
||
|
|
self.current_data.append(data)
|
||
|
|
|
||
|
|
def decode(self, pretty_print=False,
|
||
|
|
eventual_encoding=DEFAULT_OUTPUT_ENCODING,
|
||
|
|
formatter="minimal"):
|
||
|
|
"""Returns a string or Unicode representation of the parse tree
|
||
|
|
as an HTML or XML document.
|
||
|
|
|
||
|
|
:param pretty_print: If this is True, indentation will be used to
|
||
|
|
make the document more readable.
|
||
|
|
:param eventual_encoding: The encoding of the final document.
|
||
|
|
If this is None, the document will be a Unicode string.
|
||
|
|
"""
|
||
|
|
if self.is_xml:
|
||
|
|
# Print the XML declaration
|
||
|
|
encoding_part = ''
|
||
|
|
if eventual_encoding in PYTHON_SPECIFIC_ENCODINGS:
|
||
|
|
# This is a special Python encoding; it can't actually
|
||
|
|
# go into an XML document because it means nothing
|
||
|
|
# outside of Python.
|
||
|
|
eventual_encoding = None
|
||
|
|
if eventual_encoding != None:
|
||
|
|
encoding_part = ' encoding="%s"' % eventual_encoding
|
||
|
|
prefix = '<?xml version="1.0"%s?>\n' % encoding_part
|
||
|
|
else:
|
||
|
|
prefix = ''
|
||
|
|
if not pretty_print:
|
||
|
|
indent_level = None
|
||
|
|
else:
|
||
|
|
indent_level = 0
|
||
|
|
return prefix + super(BeautifulSoup, self).decode(
|
||
|
|
indent_level, eventual_encoding, formatter)
|
||
|
|
|
||
|
|
# Aliases to make it easier to get started quickly, e.g. 'from bs4 import _soup'
|
||
|
|
_s = BeautifulSoup
|
||
|
|
_soup = BeautifulSoup
|
||
|
|
|
||
|
|
class BeautifulStoneSoup(BeautifulSoup):
|
||
|
|
"""Deprecated interface to an XML parser."""
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
kwargs['features'] = 'xml'
|
||
|
|
warnings.warn(
|
||
|
|
'The BeautifulStoneSoup class is deprecated. Instead of using '
|
||
|
|
'it, pass features="xml" into the BeautifulSoup constructor.',
|
||
|
|
DeprecationWarning
|
||
|
|
)
|
||
|
|
super(BeautifulStoneSoup, self).__init__(*args, **kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
class StopParsing(Exception):
|
||
|
|
"""Exception raised by a TreeBuilder if it's unable to continue parsing."""
|
||
|
|
pass
|
||
|
|
|
||
|
|
class FeatureNotFound(ValueError):
|
||
|
|
"""Exception raised by the BeautifulSoup constructor if no parser with the
|
||
|
|
requested features is found.
|
||
|
|
"""
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
#If this file is run as a script, act as an HTML pretty-printer.
|
||
|
|
if __name__ == '__main__':
|
||
|
|
import sys
|
||
|
|
soup = BeautifulSoup(sys.stdin)
|
||
|
|
print((soup.prettify()))
|