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<?php |
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namespace Katten\Purge; |
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use Sabberworm\CSS\CSSList\Document; |
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use Sabberworm\CSS\RuleSet\DeclarationBlock; |
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class Purger { |
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/** |
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* @var $cssBlocks |
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* A hash table of css DeclarationBlock objects |
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*/ |
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private $cssBlocks; |
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public function __construct(BlockHashTable $hashTable) { |
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$this->cssBlocks = $hashTable; |
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} |
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/** |
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* Compares the CSS selectors against those found in the Crawler object |
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* |
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* @param PurgeHtmlCrawler $dom |
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*/ |
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public function purge(PurgeHtmlCrawler $dom) { |
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foreach ($this->cssBlocks->getBlockCollection() as $block) { |
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$decBlock = $block[BlockHashTable::BLOCK_VALUE]; |
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$unusedBlock = $this->filter($decBlock, $dom); |
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if ($unusedBlock == null) { |
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$hash = $this->cssBlocks->hashBlock($decBlock); |
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$this->cssBlocks->setUsedFlag($hash, true); |
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} |
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} |
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} |
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/** |
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* Get all unused css from the cssBlocks hashtable |
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* |
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* @return |
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* An array of DeclarationBlock objects |
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*/ |
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public function getPurgedCss() { |
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$unusedCss = []; |
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foreach ($this->cssBlocks->getBlockCollection() as $block) { |
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if (!$block[BlockHashTable::IS_USED]) { |
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$unusedCss[] = $block[BlockHashTable::BLOCK_VALUE]; |
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} |
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} |
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return $unusedCss; |
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} |
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/** |
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* Filter out any used CSS on a selector by selector basis |
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* |
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* @param DeclarationBlock $block |
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* |
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* @return mixed |
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* Return the DeclarationBlock if no usage is found |
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* otherwise, return null |
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*/ |
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public function filter(DeclarationBlock $block, PurgeHtmlCrawler $dom) { |
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foreach ($block->getSelectors() as $selector) { |
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$processedSelector = $this->preprocess($selector->getSelector()); |
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$usage = $dom->findFirstInstance($processedSelector); |
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if (count($usage) > 0) { |
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return null; |
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} |
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} |
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return $block; |
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} |
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/** |
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* Strip any pseudo classes out of the selector |
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* |
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* @param string $selector |
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* |
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* @return string |
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* A processed selector string |
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*/ |
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public function preprocess($selector) { |
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if (strstr($selector, ':')) { |
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$processedSelector = preg_replace('/\([^()]+\)|::?[^ ,:.(]+/i', '', $selector); |
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} |
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else { |
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$processedSelector = $selector; |
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} |
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return $processedSelector; |
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} |
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} |
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FrancisBaileyH /
Purge
