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.

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.