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<?php |
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namespace UCD\Infrastructure\Repository\CharacterRepository\XMLRepository\CodepointElementReader; |
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use UCD\Infrastructure\Repository\CharacterRepository\XMLRepository\CodepointElementReader; |
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use UCD\Infrastructure\Repository\CharacterRepository\XMLRepository\XMLReader; |
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final class StreamingReader implements CodepointElementReader |
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{ |
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const ELEMENT_CHARACTER = 'char'; |
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const ELEMENT_NON_CHARACTER = 'noncharacter'; |
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const ELEMENT_SURROGATE = 'surrogate'; |
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/** |
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* @var array |
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*/ |
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private static $elements = [ |
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self::ELEMENT_CHARACTER => true, |
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self::ELEMENT_NON_CHARACTER => true, |
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self::ELEMENT_SURROGATE => true |
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]; |
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/** |
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* @var XMLReader |
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*/ |
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private $xmlReader; |
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/** |
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* @param XMLReader $xmlReader |
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*/ |
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public function __construct(XMLReader $xmlReader) |
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{ |
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$this->xmlReader = $xmlReader; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function read() |
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{ |
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$this->preRead(); |
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try { |
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while ($element = $this->readNext()) { |
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yield $element; |
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} |
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} finally { |
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$this->postRead(); |
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} |
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} |
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private function preRead() |
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{ |
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$this->xmlReader->reopen(); |
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while ($this->cursorHasElement() !== true) { |
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$this->xmlReader->read(); |
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} |
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} |
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private function postRead() |
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{ |
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$this->xmlReader->close(); |
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} |
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/** |
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* @return bool |
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*/ |
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private function cursorHasElement() |
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{ |
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return $this->xmlReader->nodeType === XMLReader::ELEMENT |
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&& array_key_exists($this->xmlReader->name, self::$elements); |
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} |
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/** |
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* @return \DOMElement|null |
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*/ |
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private function readNext() |
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{ |
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if (!$this->cursorHasElement()) { |
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return null; |
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} |
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$element = $this->xmlReader->expand(); |
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$this->moveToNextElement(); |
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return $element; |
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} |
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private function moveToNextElement() |
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{ |
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while ($this->xmlReader->next() !== false) { |
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if ($this->cursorHasElement()) { |
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break; |
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} |
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} |
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} |
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} |
nick-jones /
php-ucd
