Subject.php
153 lines
| 1 | <?php |
| 2 | namespace enshrined\svgSanitize\ElementReference; |
| 3 | |
| 4 | class Subject |
| 5 | { |
| 6 | /** |
| 7 | * @var \DOMElement |
| 8 | */ |
| 9 | protected $element; |
| 10 | |
| 11 | /** |
| 12 | * @var Usage[] |
| 13 | */ |
| 14 | protected $useCollection = []; |
| 15 | |
| 16 | /** |
| 17 | * @var Usage[] |
| 18 | */ |
| 19 | protected $usedInCollection = []; |
| 20 | |
| 21 | /** |
| 22 | * @var int |
| 23 | */ |
| 24 | protected $useNestingLimit; |
| 25 | |
| 26 | /** |
| 27 | * Subject constructor. |
| 28 | * |
| 29 | * @param \DOMElement $element |
| 30 | * @param int $useNestingLimit |
| 31 | */ |
| 32 | public function __construct(\DOMElement $element, $useNestingLimit) |
| 33 | { |
| 34 | $this->element = $element; |
| 35 | $this->useNestingLimit = $useNestingLimit; |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * @return \DOMElement |
| 40 | */ |
| 41 | public function getElement() |
| 42 | { |
| 43 | return $this->element; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * @return string |
| 48 | */ |
| 49 | public function getElementId() |
| 50 | { |
| 51 | return $this->element->getAttribute('id'); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * @param array $subjects Previously processed subjects |
| 56 | * @param int $level The current level of nesting. |
| 57 | * @return bool |
| 58 | * @throws \enshrined\svgSanitize\Exceptions\NestingException |
| 59 | */ |
| 60 | public function hasInfiniteLoop(array $subjects = [], $level = 1) |
| 61 | { |
| 62 | if ($level > $this->useNestingLimit) { |
| 63 | throw new \enshrined\svgSanitize\Exceptions\NestingException('Nesting level too high, aborting', 1570713498, null, $this->getElement()); |
| 64 | } |
| 65 | |
| 66 | if (in_array($this, $subjects, true)) { |
| 67 | return true; |
| 68 | } |
| 69 | $subjects[] = $this; |
| 70 | foreach ($this->useCollection as $usage) { |
| 71 | if ($usage->getSubject()->hasInfiniteLoop($subjects, $level + 1)) { |
| 72 | return true; |
| 73 | } |
| 74 | } |
| 75 | return false; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * @param Subject $subject |
| 80 | */ |
| 81 | public function addUse(Subject $subject) |
| 82 | { |
| 83 | if ($subject === $this) { |
| 84 | throw new \LogicException('Cannot add self usage', 1570713416); |
| 85 | } |
| 86 | $identifier = $subject->getElementId(); |
| 87 | if (isset($this->useCollection[$identifier])) { |
| 88 | $this->useCollection[$identifier]->increment(); |
| 89 | return; |
| 90 | } |
| 91 | $this->useCollection[$identifier] = new Usage($subject); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * @param Subject $subject |
| 96 | */ |
| 97 | public function addUsedIn(Subject $subject) |
| 98 | { |
| 99 | if ($subject === $this) { |
| 100 | throw new \LogicException('Cannot add self as usage', 1570713417); |
| 101 | } |
| 102 | $identifier = $subject->getElementId(); |
| 103 | if (isset($this->usedInCollection[$identifier])) { |
| 104 | $this->usedInCollection[$identifier]->increment(); |
| 105 | return; |
| 106 | } |
| 107 | $this->usedInCollection[$identifier] = new Usage($subject); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * @param bool $accumulated |
| 112 | * @return int |
| 113 | */ |
| 114 | public function countUse($accumulated = false) |
| 115 | { |
| 116 | $count = 0; |
| 117 | foreach ($this->useCollection as $use) { |
| 118 | $useCount = $use->getSubject()->countUse(); |
| 119 | $count += $use->getCount() * ($accumulated ? 1 + $useCount : max(1, $useCount)); |
| 120 | } |
| 121 | return $count; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * @return int |
| 126 | */ |
| 127 | public function countUsedIn() |
| 128 | { |
| 129 | $count = 0; |
| 130 | foreach ($this->usedInCollection as $usedIn) { |
| 131 | $count += $usedIn->getCount() * max(1, $usedIn->getSubject()->countUsedIn()); |
| 132 | } |
| 133 | return $count; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Clear the internal arrays (to free up memory as they can get big) |
| 138 | * and return all the child usages DOMElement's |
| 139 | * |
| 140 | * @return array |
| 141 | */ |
| 142 | public function clearInternalAndGetAffectedElements() |
| 143 | { |
| 144 | $elements = array_map(function(Usage $usage) { |
| 145 | return $usage->getSubject()->getElement(); |
| 146 | }, $this->useCollection); |
| 147 | |
| 148 | $this->usedInCollection = []; |
| 149 | $this->useCollection = []; |
| 150 | |
| 151 | return $elements; |
| 152 | } |
| 153 | } |