adblockparser 0.6

Installation

pip install adblockparser

Python 2.7 and Python 3.3+ are supported.

If you plan to use this library with a large number of filters installing pyre2 library is highly recommended: the speedup for a list of default EasyList filters can be greater than 1000x.

pip install ‘re2 >= 0.2.21’

Note that pyre2 library requires C++ re2 library installed. On OS X you can get it using homebrew (brew install re2).

Usage

To learn about Adblock Plus filter syntax check these links:

• https://adblockplus.org/en/filter-cheatsheet

• https://adblockplus.org/en/filters

1. Get filter rules somewhere: write them manually, read lines from a file downloaded from EasyList, etc.:

   >>> raw_rules = [
   ...     "||ads.example.com^",
   ...     "@@||ads.example.com/notbanner^$~script",
   ... ]

2. Create AdblockRules instance from rule strings:

   >>> from adblockparser import AdblockRules
   >>> rules = AdblockRules(raw_rules)

3. Use this instance to check if an URL should be blocked or not:

   >>> rules.should_block("http://ads.example.com")
   True

   Rules with options are ignored unless you pass a dict with options values:

   >>> rules.should_block("http://ads.example.com/notbanner")
   True
   >>> rules.should_block("http://ads.example.com/notbanner", {'script': False})
   False
   >>> rules.should_block("http://ads.example.com/notbanner", {'script': True})
   True

Consult with Adblock Plus docs for options description. These options allow to write filters that depend on some external information not available in URL itself.

Performance

>>> rules = AdblockRules(raw_rules, use_re2=True, max_mem=512*1024*1024)  # doctest: +SKIP

>>> rules = AdblockRules(
...    raw_rules,
...    supported_options=['script', 'domain'],
...    skip_unsupported_rules=False
... )
>>> options = {'script': False, 'domain': 'www.mystartpage.com'}
>>> rules.should_block("http://ads.example.com/notbanner", options)
False

Limitations

There are some known limitations of the current implementation:

• element hiding rules are ignored;

• matching URLs against a large number of filters can be slow-ish, especially if pyre2 is not installed and many filter options are enabled;

• match-case filter option is not properly supported (it is ignored);

• document filter option is not properly supported;

• rules are not validated before parsing, so invalid rules may raise inconsistent exceptions or silently work incorrectly.

It is possible to remove all these limitations. Pull requests are welcome if you want to make it happen sooner!

Contributing

• source code: https://github.com/scrapinghub/adblockparser

• issue tracker: https://github.com/scrapinghub/adblockparser/issues

In order to run tests, install tox and type

tox

from the source checkout.

The license is MIT.

0.6 (2016-09-10)

• Added support for regex rules (thanks https://github.com/mlyko).

0.5 (2016-03-04)

• Fixed an issue with blank lines in filter files (thanks https://github.com/skrypka);

• fixed an issue with applying rules with ‘domain’ option when domain doesn’t have a dot (e.g. ‘localhost’);

• Python 2.6 and Python 3.2 support is dropped; adblockparser likely still work in these interpreters, but this is no longer checked by tests.

0.4 (2015-03-29)

• AdblockRule now caches the compiled regexes (thanks https://github.com/mozbugbox);

• Fixed an issue with “domain” option handling (thanks https://github.com/nbraem for the bug report and a test case);

• cleanups and test improvements.

0.3 (2014-07-11)

• Switch to setuptools;

• better __repr__ for AdblockRule;

• Python 3.4 support is confirmed;

• testing improvements.

0.2 (2014-03-20)

This release provides much faster AdblockRules.should_block() method for rules without options and rules with ‘domain’ option.

• better combined regex for option-less rules that makes re2 library always use DFA without falling back to NFA;

• an index for rules with domains;

• params method arguments are renamed to options for consistency.

0.1.1 (2014-03-11)

By default AdblockRules autodetects re2 library and uses it if a compatible version is detected.

0.1 (2014-03-03)

Initial release.