html5lib ======== .. image:: https://travis-ci.org/html5lib/html5lib-python.png?branch=master :target: https://travis-ci.org/html5lib/html5lib-python html5lib is a pure-python library for parsing HTML. It is designed to conform to the WHATWG HTML specification, as is implemented by all major web browsers. Usage ----- Simple usage follows this pattern: .. code-block:: python import html5lib with open("mydocument.html", "rb") as f: document = html5lib.parse(f) or: .. code-block:: python import html5lib document = html5lib.parse("

Hello World!") By default, the ``document`` will be an ``xml.etree`` element instance. Whenever possible, html5lib chooses the accelerated ``ElementTree`` implementation (i.e. ``xml.etree.cElementTree`` on Python 2.x). Two other tree types are supported: ``xml.dom.minidom`` and ``lxml.etree``. To use an alternative format, specify the name of a treebuilder: .. code-block:: python import html5lib with open("mydocument.html", "rb") as f: lxml_etree_document = html5lib.parse(f, treebuilder="lxml") When using with ``urllib2`` (Python 2), the charset from HTTP should be pass into html5lib as follows: .. code-block:: python from contextlib import closing from urllib2 import urlopen import html5lib with closing(urlopen("http://example.com/")) as f: document = html5lib.parse(f, encoding=f.info().getparam("charset")) When using with ``urllib.request`` (Python 3), the charset from HTTP should be pass into html5lib as follows: .. code-block:: python from urllib.request import urlopen import html5lib with urlopen("http://example.com/") as f: document = html5lib.parse(f, encoding=f.info().get_content_charset()) To have more control over the parser, create a parser object explicitly. For instance, to make the parser raise exceptions on parse errors, use: .. code-block:: python import html5lib with open("mydocument.html", "rb") as f: parser = html5lib.HTMLParser(strict=True) document = parser.parse(f) When you're instantiating parser objects explicitly, pass a treebuilder class as the ``tree`` keyword argument to use an alternative document format: .. code-block:: python import html5lib parser = html5lib.HTMLParser(tree=html5lib.getTreeBuilder("dom")) minidom_document = parser.parse("

Hello World!") More documentation is available at http://html5lib.readthedocs.org/. Installation ------------ html5lib works on CPython 2.6+, CPython 3.2+ and PyPy. To install it, use: .. code-block:: bash $ pip install html5lib Optional Dependencies --------------------- The following third-party libraries may be used for additional functionality: - ``datrie`` can be used to improve parsing performance (though in almost all cases the improvement is marginal); - ``lxml`` is supported as a tree format (for both building and walking) under CPython (but *not* PyPy where it is known to cause segfaults); - ``genshi`` has a treewalker (but not builder); and - ``charade`` can be used as a fallback when character encoding cannot be determined; ``chardet``, from which it was forked, can also be used on Python 2. - ``ordereddict`` can be used under Python 2.6 (``collections.OrderedDict`` is used instead on later versions) to serialize attributes in alphabetical order. Bugs ---- Please report any bugs on the `issue tracker `_. Tests ----- Unit tests require the ``nose`` library and can be run using the ``nosetests`` command in the root directory; ``ordereddict`` is required under Python 2.6. All should pass. Test data are contained in a separate `html5lib-tests `_ repository and included as a submodule, thus for git checkouts they must be initialized:: $ git submodule init $ git submodule update If you have all compatible Python implementations available on your system, you can run tests on all of them using the ``tox`` utility, which can be found on PyPI. Questions? ---------- There's a mailing list available for support on Google Groups, `html5lib-discuss `_, though you may get a quicker response asking on IRC in `#whatwg on irc.freenode.net `_. Change Log ---------- 0.9999999/1.0b8 ~~~~~~~~~~~~~~~ Released on September 10, 2015 * Fix #195: fix the sanitizer to drop broken URLs (it threw an exception between 0.9999 and 0.999999). 0.999999/1.0b7 ~~~~~~~~~~~~~~ Released on July 7, 2015 * Fix #189: fix the sanitizer to allow relative URLs again (as it did prior to 0.9999/1.0b5). 0.99999/1.0b6 ~~~~~~~~~~~~~ Released on April 30, 2015 * Fix #188: fix the sanitizer to not throw an exception when sanitizing bogus data URLs. 0.9999/1.0b5 ~~~~~~~~~~~~ Released on April 29, 2015 * Fix #153: Sanitizer fails to treat some attributes as URLs. Despite how this sounds, this has no known security implications. No known version of IE (5.5 to current), Firefox (3 to current), Safari (6 to current), Chrome (1 to current), or Opera (12 to current) will run any script provided in these attributes. * Pass error message to the ParseError exception in strict parsing mode. * Allow data URIs in the sanitizer, with a whitelist of content-types. * Add support for Python implementations that don't support lone surrogates (read: Jython). Fixes #2. * Remove localization of error messages. This functionality was totally unused (and untested that everything was localizable), so we may as well follow numerous browsers in not supporting translating technical strings. * Expose treewalkers.pprint as a public API. * Add a documentEncoding property to HTML5Parser, fix #121. 0.999 ~~~~~ Released on December 23, 2013 * Fix #127: add work-around for CPython issue #20007: .read(0) on http.client.HTTPResponse drops the rest of the content. * Fix #115: lxml treewalker can now deal with fragments containing, at their root level, text nodes with non-ASCII characters on Python 2. 0.99 ~~~~ Released on September 10, 2013 * No library changes from 1.0b3; released as 0.99 as pip has changed behaviour from 1.4 to avoid installing pre-release versions per PEP 440. 1.0b3 ~~~~~ Released on July 24, 2013 * Removed ``RecursiveTreeWalker`` from ``treewalkers._base``. Any implementation using it should be moved to ``NonRecursiveTreeWalker``, as everything bundled with html5lib has for years. * Fix #67 so that ``BufferedStream`` to correctly returns a bytes object, thereby fixing any case where html5lib is passed a non-seekable RawIOBase-like object. 1.0b2 ~~~~~ Released on June 27, 2013 * Removed reordering of attributes within the serializer. There is now an ``alphabetical_attributes`` option which preserves the previous behaviour through a new filter. This allows attribute order to be preserved through html5lib if the tree builder preserves order. * Removed ``dom2sax`` from DOM treebuilders. It has been replaced by ``treeadapters.sax.to_sax`` which is generic and supports any treewalker; it also resolves all known bugs with ``dom2sax``. * Fix treewalker assertions on hitting bytes strings on Python 2. Previous to 1.0b1, treewalkers coped with mixed bytes/unicode data on Python 2; this reintroduces this prior behaviour on Python 2. Behaviour is unchanged on Python 3. 1.0b1 ~~~~~ Released on May 17, 2013 * Implementation updated to implement the `HTML specification `_ as of 5th May 2013 (`SVN `_ revision r7867). * Python 3.2+ supported in a single codebase using the ``six`` library. * Removed support for Python 2.5 and older. * Removed the deprecated Beautiful Soup 3 treebuilder. ``beautifulsoup4`` can use ``html5lib`` as a parser instead. Note that since it doesn't support namespaces, foreign content like SVG and MathML is parsed incorrectly. * Removed ``simpletree`` from the package. The default tree builder is now ``etree`` (using the ``xml.etree.cElementTree`` implementation if available, and ``xml.etree.ElementTree`` otherwise). * Removed the ``XHTMLSerializer`` as it never actually guaranteed its output was well-formed XML, and hence provided little of use. * Removed default DOM treebuilder, so ``html5lib.treebuilders.dom`` is no longer supported. ``html5lib.treebuilders.getTreeBuilder("dom")`` will return the default DOM treebuilder, which uses ``xml.dom.minidom``. * Optional heuristic character encoding detection now based on ``charade`` for Python 2.6 - 3.3 compatibility. * Optional ``Genshi`` treewalker support fixed. * Many bugfixes, including: * #33: null in attribute value breaks XML AttValue; * #4: nested, indirect descendant,