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<?php
/**
* Chainable filters for custom URI processing.
*
* These filters can perform custom actions on a URI filter object,
* including transformation or blacklisting. A filter named Foo
* must have a corresponding configuration directive %URI.Foo,
* unless always_load is specified to be true.
*
* The following contexts may be available while URIFilters are being
* processed:
*
* - EmbeddedURI: true if URI is an embedded resource that will
* be loaded automatically on page load
* - CurrentToken: a reference to the token that is currently
* being processed
* - CurrentAttr: the name of the attribute that is currently being
* processed
* - CurrentCSSProperty: the name of the CSS property that is
* currently being processed (if applicable)
*
* @warning This filter is called before scheme object validation occurs.
* Make sure, if you require a specific scheme object, you
* you check that it exists. This allows filters to convert
* proprietary URI schemes into regular ones.
*/
abstract class HTMLPurifier_URIFilter
{
/**
* Unique identifier of filter.
* @type string
*/
public $name;
/**
* True if this filter should be run after scheme validation.
* @type bool
*/
public $post = false;
/**
* True if this filter should always be loaded.
* This permits a filter to be named Foo without the corresponding
* %URI.Foo directive existing.
* @type bool
*/
public $always_load = false;
/**
* Performs initialization for the filter. If the filter returns
* false, this means that it shouldn't be considered active.
* @param HTMLPurifier_Config $config
* @return bool
*/
public function prepare($config)
{
return true;
}
/**
* Filter a URI object
* @param HTMLPurifier_URI $uri Reference to URI object variable
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return bool Whether or not to continue processing: false indicates
* URL is no good, true indicates continue processing. Note that
* all changes are committed directly on the URI object
*/
abstract public function filter(&$uri, $config, $context);
}
// vim: et sw=4 sts=4