html5rdf

html5rdf is a pure-python library for parsing HTML to DOMFragment objects for the use in RDFLib. html5rdf is a fork of html5lib-python. See below for the html5lib README.

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It is designed to conform to the WHATWG HTML specification, as is implemented by all major web browsers.

htm5lib-modern is designed as a drop-in replacement for html5lib that exposes a new html5lib module without Python 2 support and without the legacy dependencies on six, and webencodings. Note, you should not have the old deprecated html5lib and html5lib-modern in your dependency tree at the same time, because they alias.

Usage

Simple usage follows this pattern:

import html5rdf
with open("mydocument.html", "rb") as f:
    document = html5rdf.parse(f)

or:

import html5rdf
document = html5rdf.parse("<p>Hello World!")

By default, the document will be an xml.etree element instance. Whenever possible, html5lib chooses the accelerated ElementTree implementation.

Two other tree types are supported: xml.dom.minidom and lxml.etree. To use an alternative format, specify the name of a treebuilder:

import html5rdf
with open("mydocument.html", "rb") as f:
    lxml_etree_document = html5rdf.parse(f, treebuilder="lxml")

When using with urllib.request (Python 3), the charset from HTTP should be pass into html5rdf as follows:

from urllib.request import urlopen
import html5rdf

with urlopen("http://example.com/") as f:
    document = html5rdf.parse(f, transport_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:

import html5rdf
with open("mydocument.html", "rb") as f:
    parser = html5rdf.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:

import html5rdf
parser = html5rdf.HTMLParser(tree=html5rdf.getTreeBuilder("dom"))
minidom_document = parser.parse("<p>Hello World!")

More documentation is available at https://html5lib.readthedocs.io/.

Installation

html5rdf works on CPython 3.8+ and PyPy. To install:

$ pip install html5rdf

The goal is to support a (non-strict) superset of the versions that pip supports.

Optional Dependencies

The following third-party libraries may be used for additional functionality:

• 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
• chardet can be used as a fallback when character encoding cannot be determined.

Bugs

Please report any bugs on the issue tracker.

Tests

Unit tests require the pytest and mock libraries and can be run using the pytest command in the root directory.

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.