A Python parser for MediaWiki wikicode https://mwparserfromhell.readthedocs.io/
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Ben Kurtovic ba94938fe8 release/0.1 9 years ago
docs release/0.1 9 years ago
mwparserfromhell release/0.1 9 years ago
tests Support changing a template's name, plus a couple of typos and docs. 9 years ago
.gitignore Adding Python 3 support 9 years ago
LICENSE Update copyright notice; some additions. 10 years ago
README.rst Final fixes and cleanup before release. 9 years ago
setup.py Copyedit, fixes, clarify Python 2 + 3 support. 9 years ago

README.rst

mwparserfromhell
================

**mwparserfromhell** (the *MediaWiki Parser from Hell*) is a Python package
that provides an easy-to-use and outrageously powerful parser for MediaWiki_
wikicode. It supports Python 2 and Python 3.

Developed by Earwig_ with help from `Σ`_.

Installation
------------

The easiest way to install the parser is through the `Python Package Index`_,
so you can install the latest release with ``pip install mwparserfromhell``
(`get pip`_). Alternatively, get the latest development version::

git clone git://github.com/earwig/mwparserfromhell.git
cd mwparserfromhell
python setup.py install

You can run the comprehensive unit testing suite with ``python setup.py test``.

Usage
-----

Normal usage is rather straightforward (where ``text`` is page text)::

>>> import mwparserfromhell
>>> wikicode = mwparserfromhell.parse(text)

``wikicode`` is a ``mwparserfromhell.wikicode.Wikicode`` object, which acts
like an ordinary ``unicode`` object (or ``str`` in Python 3) with some extra
methods. For example::

>>> text = "I has a template! {{foo|bar|baz|eggs=spam}} See it?"
>>> wikicode = mwparserfromhell.parse(text)
>>> print wikicode
I has a template! {{foo|bar|baz|eggs=spam}} See it?
>>> templates = wikicode.filter_templates()
>>> print templates
['{{foo|bar|baz|eggs=spam}}']
>>> template = templates[0]
>>> print template.name
foo
>>> print template.params
['bar', 'baz', 'eggs=spam']
>>> print template.get(1).value
bar
>>> print template.get("eggs").value
spam

Since every node you reach is also a ``Wikicode`` object, it's trivial to get
nested templates::

>>> code = mwparserfromhell.parse("{{foo|this {{includes a|template}}}}")
>>> print code.filter_templates()
['{{foo|this {{includes a|template}}}}']
>>> foo = code.filter_templates()[0]
>>> print foo.get(1).value
this {{includes a|template}}
>>> print foo.get(1).value.filter_templates()[0]
{{includes a|template}}
>>> print foo.get(1).value.filter_templates()[0].get(1).value
template

Additionally, you can include nested templates in ``filter_templates()`` by
passing ``recursive=True``::

>>> text = "{{foo|{{bar}}={{baz|{{spam}}}}}}"
>>> mwparserfromhell.parse(text).filter_templates(recursive=True)
['{{foo|{{bar}}={{baz|{{spam}}}}}}', '{{bar}}', '{{baz|{{spam}}}}', '{{spam}}']

Templates can be easily modified to add, remove, alter or params. ``Wikicode``
can also be treated like a list with ``append()``, ``insert()``, ``remove()``,
``replace()``, and more::

>>> text = "{{cleanup}} '''Foo''' is a [[bar]]. {{uncategorized}}"
>>> code = mwparserfromhell.parse(text)
>>> for template in code.filter_templates():
... if template.name == "cleanup" and not template.has_param("date"):
... template.add("date", "July 2012")
...
>>> print code
{{cleanup|date=July 2012}} '''Foo''' is a [[bar]]. {{uncategorized}}
>>> code.replace("{{uncategorized}}", "{{bar-stub}}")
>>> print code
{{cleanup|date=July 2012}} '''Foo''' is a [[bar]]. {{bar-stub}}
>>> print code.filter_templates()
['{{cleanup|date=July 2012}}', '{{bar-stub}}']

You can then convert ``code`` back into a regular ``unicode`` object (for
saving the page!) by calling ``unicode()`` on it::

>>> text = unicode(code)
>>> print text
{{cleanup|date=July 2012}} '''Foo''' is a [[bar]]. {{bar-stub}}
>>> text == code
True

Likewise, use ``str(code)`` in Python 3.

Integration
-----------

``mwparserfromhell`` is used by and originally developed for EarwigBot_;
``Page`` objects have a ``parse`` method that essentially calls
``mwparserfromhell.parse()`` on ``page.get()``.

If you're using PyWikipedia_, your code might look like this::

import mwparserfromhell
import wikipedia as pywikibot
def parse(title):
site = pywikibot.get_site()
page = pywikibot.Page(site, title)
text = page.get()
return mwparserfromhell.parse(text)

If you're not using a library, you can parse templates in any page using the
following code (via the API_)::

import json
import urllib
import mwparserfromhell
API_URL = "http://en.wikipedia.org/w/api.php"
def parse(title):
raw = urllib.urlopen(API_URL, data).read()
res = json.loads(raw)
text = res["query"]["pages"].values()[0]["revisions"][0]["*"]
return mwparserfromhell.parse(text)

.. _MediaWiki: http://mediawiki.org
.. _Earwig: http://en.wikipedia.org/wiki/User:The_Earwig
.. _Σ: http://en.wikipedia.org/wiki/User:Σ
.. _Python Package Index: http://pypi.python.org
.. _get pip: http://pypi.python.org/pypi/pip
.. _EarwigBot: https://github.com/earwig/earwigbot
.. _PyWikipedia: http://pywikipediabot.sourceforge.net/
.. _API: http://mediawiki.org/wiki/API