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<?php
/**
* Registry object that contains information about the current context.
* @warning Is a bit buggy when variables are set to null: it thinks
* they don't exist! So use false instead, please.
* @note Since the variables Context deals with may not be objects,
* references are very important here! Do not remove!
*/
class HTMLPurifier_Context
{
/**
* Private array that stores the references.
* @type array
*/
private $_storage = array();
/**
* Registers a variable into the context.
* @param string $name String name
* @param mixed $ref Reference to variable to be registered
*/
public function register($name, &$ref)
{
if (array_key_exists($name, $this->_storage)) {
trigger_error(
"Name $name produces collision, cannot re-register",
E_USER_ERROR
);
return;
}
$this->_storage[$name] =& $ref;
}
/**
* Retrieves a variable reference from the context.
* @param string $name String name
* @param bool $ignore_error Boolean whether or not to ignore error
* @return mixed
*/
public function &get($name, $ignore_error = false)
{
if (!array_key_exists($name, $this->_storage)) {
if (!$ignore_error) {
trigger_error(
"Attempted to retrieve non-existent variable $name",
E_USER_ERROR
);
}
$var = null; // so we can return by reference
return $var;
}
return $this->_storage[$name];
}
/**
* Destroys a variable in the context.
* @param string $name String name
*/
public function destroy($name)
{
if (!array_key_exists($name, $this->_storage)) {
trigger_error(
"Attempted to destroy non-existent variable $name",
E_USER_ERROR
);
return;
}
unset($this->_storage[$name]);
}
/**
* Checks whether or not the variable exists.
* @param string $name String name
* @return bool
*/
public function exists($name)
{
return array_key_exists($name, $this->_storage);
}
/**
* Loads a series of variables from an associative array
* @param array $context_array Assoc array of variables to load
*/
public function loadArray($context_array)
{
foreach ($context_array as $key => $discard) {
$this->register($key, $context_array[$key]);
}
}
}
// vim: et sw=4 sts=4