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<?php
/**
* Generic property list implementation
*/
class HTMLPurifier_PropertyList
{
/**
* Internal data-structure for properties.
* @type array
*/
protected $data = array();
/**
* Parent plist.
* @type HTMLPurifier_PropertyList
*/
protected $parent;
/**
* Cache.
* @type array
*/
protected $cache;
/**
* @param HTMLPurifier_PropertyList $parent Parent plist
*/
public function __construct($parent = null)
{
$this->parent = $parent;
}
/**
* Recursively retrieves the value for a key
* @param string $name
* @throws HTMLPurifier_Exception
*/
public function get($name)
{
if ($this->has($name)) {
return $this->data[$name];
}
// possible performance bottleneck, convert to iterative if necessary
if ($this->parent) {
return $this->parent->get($name);
}
throw new HTMLPurifier_Exception("Key '$name' not found");
}
/**
* Sets the value of a key, for this plist
* @param string $name
* @param mixed $value
*/
public function set($name, $value)
{
$this->data[$name] = $value;
}
/**
* Returns true if a given key exists
* @param string $name
* @return bool
*/
public function has($name)
{
return array_key_exists($name, $this->data);
}
/**
* Resets a value to the value of it's parent, usually the default. If
* no value is specified, the entire plist is reset.
* @param string $name
*/
public function reset($name = null)
{
if ($name == null) {
$this->data = array();
} else {
unset($this->data[$name]);
}
}
/**
* Squashes this property list and all of its property lists into a single
* array, and returns the array. This value is cached by default.
* @param bool $force If true, ignores the cache and regenerates the array.
* @return array
*/
public function squash($force = false)
{
if ($this->cache !== null && !$force) {
return $this->cache;
}
if ($this->parent) {
return $this->cache = array_merge($this->parent->squash($force), $this->data);
} else {
return $this->cache = $this->data;
}
}
/**
* Returns the parent plist.
* @return HTMLPurifier_PropertyList
*/
public function getParent()
{
return $this->parent;
}
/**
* Sets the parent plist.
* @param HTMLPurifier_PropertyList $plist Parent plist
*/
public function setParent($plist)
{
$this->parent = $plist;
}
}
// vim: et sw=4 sts=4