CssSelector Component

CssSelector converts CSS selectors to XPath expressions.

The component only goal is to convert CSS selectors to their XPath equivalents:

use Symfony\Component\CssSelector\CssSelectorConverter;

$converter = new CssSelectorConverter();
print $converter->toXPath('div.item > h4 > a');

HTML and XML are different

The CssSelector component comes with an HTML extension which is enabled by default. If you need to use this component with XML documents, you have to disable this HTML extension. That's because, HTML tag & attribute names are always lower-cased, but case-sensitive in XML:

// disable `HTML` extension:
$converter = new CssSelectorConverter(false);

When the HTML extension is enabled, tag names are lower-cased, attribute names are lower-cased, the following extra pseudo-classes are supported: checked, link, disabled, enabled, selected, invalid, hover, visited, and the lang() function is also added.

Resources

This component is a port of the Python cssselect library v0.7.1, which is distributed under the BSD license.

You can run the unit tests with the following command:

$ cd path/to/Symfony/Component/CssSelector/
$ composer install
$ phpunit

License

This component is a port of the Python cssselect library, which is copyright Ian Bicking, https://github.com/SimonSapin/cssselect.

Copyright (c) 2007-2012 Ian Bicking and contributors. See AUTHORS for more details.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of Ian Bicking nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IAN BICKING OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.