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<?php namespace Cms\Classes;
/**
* Manager class for stacking nested partials and keeping track
* of their components. Partial "objects" store the components
* used by that partial for deferred retrieval.
*
* @package winter\wn-cms-module
* @author Alexey Bobkov, Samuel Georges
*/
class PartialStack
{
/**
* @var array The current partial "object" being rendered.
*/
public $activePartial;
/**
* @var array Collection of previously rendered partial "objects".
*/
protected $partialStack = [];
/**
* Partial entry point, appends a new partial to the stack.
*/
public function stackPartial()
{
if ($this->activePartial !== null) {
array_unshift($this->partialStack, $this->activePartial);
}
$this->activePartial = [
'components' => []
];
}
/**
* Partial exit point, removes the active partial from the stack.
*/
public function unstackPartial()
{
$this->activePartial = array_shift($this->partialStack);
}
/**
* Adds a component to the active partial stack.
*/
public function addComponent($alias, $componentObj)
{
array_push($this->activePartial['components'], [
'name' => $alias,
'obj' => $componentObj
]);
}
/**
* Returns a component by its alias from the partial stack.
*/
public function getComponent($name)
{
if (!$this->activePartial) {
return null;
}
$component = $this->findComponentFromStack($name, $this->activePartial);
if ($component !== null) {
return $component;
}
foreach ($this->partialStack as $stack) {
$component = $this->findComponentFromStack($name, $stack);
if ($component !== null) {
return $component;
}
}
return null;
}
/**
* Locates a component by its alias from the supplied stack.
*/
protected function findComponentFromStack($name, $stack)
{
foreach ($stack['components'] as $componentInfo) {
if ($componentInfo['name'] == $name) {
return $componentInfo['obj'];
}
}
return null;
}
}