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<?php
/*
* This file is part of Class Preloader.
*
* (c) Graham Campbell <graham@alt-three.com>
* (c) Michael Dowling <mtdowling@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace ClassPreloader;
/**
* This is the class list class.
*
* This maintains a list of classes using a sort of doubly-linked list.
*/
class ClassList
{
/**
* The head node of the list.
*
* @var \ClassPreloader\ClassNode
*/
protected $head;
/**
* The current node of the list.
*
* @var \ClassPreloader\ClassNode
*/
protected $current;
/**
* Create a new class list instance.
*
* @return void
*/
public function __construct()
{
$this->clear();
}
/**
* Clear the contents of the list and reset the head node and current node.
*
* @return void
*/
public function clear()
{
$this->head = new ClassNode();
$this->current = $this->head;
}
/**
* Traverse to the next node in the list.
*
* @return void
*/
public function next()
{
if (isset($this->current->next)) {
$this->current = $this->current->next;
} else {
$this->current->next = new ClassNode(null, $this->current);
$this->current = $this->current->next;
}
}
/**
* Insert a value at the current position in the list.
*
* Any currently set value at this position will be pushed back in the list
* after the new value.
*
* @param mixed $value
*
* @return void
*/
public function push($value)
{
if (!$this->current->value) {
$this->current->value = $value;
} else {
$temp = $this->current;
$this->current = new ClassNode($value, $temp->prev);
$this->current->next = $temp;
$temp->prev = $this->current;
if ($temp === $this->head) {
$this->head = $this->current;
} else {
$this->current->prev->next = $this->current;
}
}
}
/**
* Traverse the ClassList and return a list of classes.
*
* @return array
*/
public function getClasses()
{
$classes = [];
$current = $this->head;
while ($current && $current->value) {
$classes[] = $current->value;
$current = $current->next;
}
return array_filter($classes);
}
}