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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 BlockHashTable { |
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private $hashTable; |
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const IS_USED = 'isUsed'; |
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const BLOCK_VALUE = 'block'; |
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public function __construct() { |
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$this->hashTable = []; |
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} |
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/** |
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* Build a hash table of declaration blocks from |
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* a given Document object |
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* |
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* @param Document $css |
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*/ |
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public function build(Document $css) { |
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foreach ($css->getAllDeclarationBlocks() as $block) { |
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$hash = $this->hashBlock($block); |
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$this->hashTable[$hash] = [ self::BLOCK_VALUE => $block, self::IS_USED => false ]; |
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} |
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} |
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/** |
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* Serialize the contents of the Declaration block and hash the result |
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* |
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* @param DeclarationBlock $block |
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* |
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* @return string |
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* An md5 hash representing the DeclarationBlock object |
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*/ |
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public function hashBlock(DeclarationBlock $block) { |
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return md5(serialize($block)); |
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} |
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/** |
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* Set the used flag for the given block at a given hash index |
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* |
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* @param string $hash |
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* A hashed representation of a DeclarationBlock |
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* |
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* @param bool $value |
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* The boolean value to set the flag as |
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*/ |
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public function setUsedFlag($hash, $value) { |
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$this->hashTable[$hash][self::IS_USED] = $value; |
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} |
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/** |
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* Get the flag value for the block at a given hash index |
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* |
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* @param string $hash |
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* A hashed representation of a DeclarationBlock |
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* |
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* @return bool |
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* The value of the flag |
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*/ |
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public function getUsedFlag($hash) { |
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return $this->hashTable[$hash][self::IS_USED]; |
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} |
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/** |
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* Get the block at a given hash index |
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* |
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* @param string hash |
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* A hashed representation of a DeclarationBlock |
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* |
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* @return DeclarationBlock |
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* The declaration block at index $hash |
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*/ |
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public function getBlock($hash) { |
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return $this->hashTable[$hash][self::BLOCK_VALUE]; |
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} |
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/** |
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* Set a hashTable value |
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* |
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* @param DeclarationBlock $block |
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* |
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* @param $value |
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* A boolean flag to set IS_USED with |
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*/ |
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public function setBlock(DeclarationBlock $block, $value = false) { |
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$hash = $this->hashBlock($block); |
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$this->hashTable[$hash] = [ self::BLOCK_VALUE => $block, self::IS_USED => $value ]; |
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} |
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/** |
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* @return |
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* Return a copy of the hashTable |
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*/ |
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public function getBlockCollection() { |
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return $this->hashTable; |
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} |
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/** |
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* Determine if a block is in the hash table |
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* |
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* @param DeclarationBlock $block |
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* |
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* @return bool |
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* True if block is found |
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*/ |
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public function hasBlock(DeclarationBlock $block) { |
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$hash = $this->hashBlock($block); |
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return isset($this->hashTable[$hash]); |
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} |
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} |
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FrancisBaileyH /
Purge
