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<?php
namespace enshrined\svgSanitize\ElementReference;
class Subject
{
/**
* @var \DOMElement
*/
protected $element;
/**
* @var Usage[]
*/
protected $useCollection = [];
/**
* @var Usage[]
*/
protected $usedInCollection = [];
/**
* @var int
*/
protected $useNestingLimit;
/**
* Subject constructor.
*
* @param \DOMElement $element
* @param int $useNestingLimit
*/
public function __construct(\DOMElement $element, $useNestingLimit)
{
$this->element = $element;
$this->useNestingLimit = $useNestingLimit;
}
/**
* @return \DOMElement
*/
public function getElement()
{
return $this->element;
}
/**
* @return string
*/
public function getElementId()
{
return $this->element->getAttribute('id');
}
/**
* @param array $subjects Previously processed subjects
* @param int $level The current level of nesting.
* @return bool
* @throws \enshrined\svgSanitize\Exceptions\NestingException
*/
public function hasInfiniteLoop(array $subjects = [], $level = 1)
{
if ($level > $this->useNestingLimit) {
throw new \enshrined\svgSanitize\Exceptions\NestingException('Nesting level too high, aborting', 1570713498, null, $this->getElement());
}
if (in_array($this, $subjects, true)) {
return true;
}
$subjects[] = $this;
foreach ($this->useCollection as $usage) {
if ($usage->getSubject()->hasInfiniteLoop($subjects, $level + 1)) {
return true;
}
}
return false;
}
/**
* @param Subject $subject
*/
public function addUse(Subject $subject)
{
if ($subject === $this) {
throw new \LogicException('Cannot add self usage', 1570713416);
}
$identifier = $subject->getElementId();
if (isset($this->useCollection[$identifier])) {
$this->useCollection[$identifier]->increment();
return;
}
$this->useCollection[$identifier] = new Usage($subject);
}
/**
* @param Subject $subject
*/
public function addUsedIn(Subject $subject)
{
if ($subject === $this) {
throw new \LogicException('Cannot add self as usage', 1570713417);
}
$identifier = $subject->getElementId();
if (isset($this->usedInCollection[$identifier])) {
$this->usedInCollection[$identifier]->increment();
return;
}
$this->usedInCollection[$identifier] = new Usage($subject);
}
/**
* @param bool $accumulated
* @return int
*/
public function countUse($accumulated = false)
{
$count = 0;
foreach ($this->useCollection as $use) {
$useCount = $use->getSubject()->countUse();
$count += $use->getCount() * ($accumulated ? 1 + $useCount : max(1, $useCount));
}
return $count;
}
/**
* @return int
*/
public function countUsedIn()
{
$count = 0;
foreach ($this->usedInCollection as $usedIn) {
$count += $usedIn->getCount() * max(1, $usedIn->getSubject()->countUsedIn());
}
return $count;
}
/**
* Clear the internal arrays (to free up memory as they can get big)
* and return all the child usages DOMElement's
*
* @return array
*/
public function clearInternalAndGetAffectedElements()
{
$elements = array_map(function(Usage $usage) {
return $usage->getSubject()->getElement();
}, $this->useCollection);
$this->usedInCollection = [];
$this->useCollection = [];
return $elements;
}
}
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