CssSelector Component
=====================

CssSelector converts CSS selectors to XPath expressions.

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

```php
use Symfony\Component\CssSelector\CssSelector;

print CssSelector::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`:

```php
// disable `HTML` extension:
CssSelector::disableHtmlExtension();

// re-enable `HTML` extension:
CssSelector::enableHtmlExtension();
```

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 lxml library, which is copyright Infrae
and distributed under the BSD license.

Current code is a port of https://github.com/SimonSapin/cssselect/releases/tag/v0.7.1

You can run the unit tests with the following command:

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

CssSelector Component
=====================

CssSelector converts CSS selectors to XPath expressions.

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

```php
use Symfony\Component\CssSelector\CssSelector;

print CssSelector::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`:

```php
// disable `HTML` extension:
CssSelector::disableHtmlExtension();

// re-enable `HTML` extension:
CssSelector::enableHtmlExtension();
```

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](https://github.com/SimonSapin/cssselect/releases/tag/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.phar install
    $ phpunit

Update the note about origins of the CssSelector component.
Update the note about origins of the CssSelector component.

The last rewrite is based on the cssselect which is no longer part of lxml, but was extracted as an independent library.
