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<?php |
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/** |
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* rdfa-lite-microdata |
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* |
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* @category Jkphl |
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* @package Jkphl\RdfaLiteMicrodata |
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* @subpackage Jkphl\RdfaLiteMicrodata\Infrastructure |
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* @author Joschi Kuphal <[email protected]> / @jkphl |
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* @copyright Copyright © 2017 Joschi Kuphal <[email protected]> / @jkphl |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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*/ |
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/*********************************************************************************** |
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* The MIT License (MIT) |
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* |
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* Copyright © 2017 Joschi Kuphal <[email protected]> / @jkphl |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
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* the Software, and to permit persons to whom the Software is furnished to do so, |
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* subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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***********************************************************************************/ |
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namespace Jkphl\RdfaLiteMicrodata\Infrastructure\Parser; |
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use Jkphl\RdfaLiteMicrodata\Application\Context\ContextInterface; |
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use Jkphl\RdfaLiteMicrodata\Application\Contract\ElementProcessorInterface; |
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use Jkphl\RdfaLiteMicrodata\Domain\Property\Property; |
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use Jkphl\RdfaLiteMicrodata\Domain\Thing\Thing; |
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use Jkphl\RdfaLiteMicrodata\Domain\Thing\ThingInterface; |
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use Jkphl\RdfaLiteMicrodata\Domain\Type\Type; |
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use Jkphl\RdfaLiteMicrodata\Domain\Type\TypeInterface; |
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use Jkphl\RdfaLiteMicrodata\Domain\Vocabulary\VocabularyInterface; |
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use Jkphl\RdfaLiteMicrodata\Infrastructure\Exceptions\RuntimeException; |
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/** |
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* Abstract element processor |
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* |
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* @package Jkphl\RdfaLiteMicrodata |
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* @subpackage Jkphl\RdfaLiteMicrodata\Infrastructure |
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*/ |
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abstract class AbstractElementProcessor implements ElementProcessorInterface |
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{ |
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/** |
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* Tag name / attribute map |
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* |
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* @var array |
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*/ |
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protected static $tagNameAttributes = [ |
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'META' => 'content', |
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'AUDIO' => 'src', |
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'EMBED' => 'src', |
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'IFRAME' => 'src', |
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'IMG' => 'src', |
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'SOURCE' => 'src', |
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'TRACK' => 'src', |
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'VIDEO' => 'src', |
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'A' => 'href', |
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'AREA' => 'href', |
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'LINK' => 'href', |
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'OBJECT' => 'data', |
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'DATA' => 'value', |
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'METER' => 'value', |
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'TIME' => 'datetime' |
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]; |
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/** |
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* Property cache |
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* |
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* @var array |
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*/ |
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protected static $propertyCache = []; |
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/** |
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* HTML mode |
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* |
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* @var boolean |
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*/ |
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protected $html; |
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/** |
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* Enable / disable HTML element value resolution |
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* |
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* @param bool $html Enable HTML element value resolution |
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* @return ElementProcessorInterface Self reference |
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*/ |
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public function setHtml($html) |
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{ |
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$this->html = boolval($html); |
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return $this; |
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} |
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/** |
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* Process a DOM element's child |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Context |
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* @return ContextInterface Context for children |
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*/ |
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public function processElementChildren(\DOMElement $element, ContextInterface $context) |
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{ |
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// Process a child |
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return $this->processChild($element, $context); |
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} |
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/** |
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* Create a nested child |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Context |
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* @return ContextInterface Context for children |
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*/ |
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abstract protected function processChild(\DOMElement $element, ContextInterface $context); |
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/** |
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* Create a property |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Inherited Context |
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* @return ContextInterface Local context for this element |
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*/ |
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abstract protected function processProperty(\DOMElement $element, ContextInterface $context); |
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/** |
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* Create a property by prefix and name |
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* |
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* @param string $prefix Property prefix |
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* @param string $name Property name |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Inherited Context |
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* @param boolean $last Last property |
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* @return ContextInterface Local context for this element |
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*/ |
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protected function processPropertyPrefixName($prefix, $name, \DOMElement $element, ContextInterface $context, $last) |
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{ |
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$vocabulary = $this->getVocabulary($prefix, $context); |
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if ($vocabulary instanceof VocabularyInterface) { |
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$context = $this->addProperty($element, $context, $name, $vocabulary, $last); |
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} |
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return $context; |
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} |
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/** |
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* Return a vocabulary by prefix with fallback to the default vocabulary |
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* |
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* @param string $prefix Vocabulary prefix |
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* @param ContextInterface $context Context |
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* @return VocabularyInterface Vocabulary |
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*/ |
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abstract protected function getVocabulary($prefix, ContextInterface $context); |
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/** |
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* Add a single property |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Inherited Context |
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* @param string $name Property name |
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* @param VocabularyInterface $vocabulary Property vocabulary |
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* @param boolean $last Last property |
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* @return ContextInterface Local context for this element |
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*/ |
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protected function addProperty( |
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\DOMElement $element, |
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ContextInterface $context, |
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$name, |
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VocabularyInterface $vocabulary, |
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$last |
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) { |
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$resourceId = $this->getResourceId($element); |
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// Get the property value |
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$propertyValue = $this->getPropertyValue($element, $context); |
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$property = new Property($name, $vocabulary, $propertyValue, $resourceId); |
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// Add the property to the current parent thing |
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$context->getParentThing()->addProperty($property); |
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// If the property value is a thing and this is the element's last property |
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if (($propertyValue instanceof ThingInterface) && $last) { |
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// Set the thing as parent thing for nested iterations |
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$context = $context->setParentThing($propertyValue); |
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} |
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return $context; |
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} |
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/** |
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* Return the resource ID |
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* |
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* @param \DOMElement $element DOM element |
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* @return string|null Resource ID |
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*/ |
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abstract protected function getResourceId(\DOMElement $element); |
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/** |
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* Return a property value (type and tag name dependent) |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Context |
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* @return ThingInterface|string Property value |
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*/ |
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protected function getPropertyValue(\DOMElement $element, ContextInterface $context) |
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{ |
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$value = $this->getPropertyCache($element); |
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if ($value !== null) { |
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return $value; |
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} |
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$propertyChild = $this->getPropertyChildValue($element, $context); |
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if ($propertyChild instanceof ThingInterface) { |
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return $this->setPropertyCache($element, $propertyChild); |
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} |
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// Return a string property value |
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return $this->setPropertyCache($element, $this->getPropertyStringValue($element)); |
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} |
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/** |
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* Return a cached property value (if available) |
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* |
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* @param \DOMElement $element Element |
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* @return mixed|null Property value |
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*/ |
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protected function getPropertyCache(\DOMElement $element) |
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{ |
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$elementHash = spl_object_hash($element); |
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return isset(self::$propertyCache[$elementHash]) ? self::$propertyCache[$elementHash] : null; |
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} |
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/** |
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* Return a property child value |
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* |
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* @param \DOMElement $element DOM element |
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* @param ContextInterface $context Context |
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* @return ThingInterface|null Property child value |
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*/ |
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abstract protected function getPropertyChildValue(\DOMElement $element, ContextInterface $context); |
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/** |
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* Cache a property value |
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* |
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* @param \DOMElement $element DOM element |
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* @param mixed $value Value |
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* @return mixed $value Value |
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*/ |
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protected function setPropertyCache(\DOMElement $element, $value) |
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{ |
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return self::$propertyCache[spl_object_hash($element)] = $value; |
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} |
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/** |
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* Return a property value (type and tag name dependent) |
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* |
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* @param \DOMElement $element DOM element |
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* @return ThingInterface|string Property value |
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*/ |
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protected function getPropertyStringValue(\DOMElement $element) |
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{ |
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// If HTML mode is active |
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if ($this->html) { |
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$tagName = strtoupper($element->tagName); |
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// Map to an attribute (if applicable) |
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if (array_key_exists($tagName, self::$tagNameAttributes)) { |
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$value = strval($element->getAttribute(self::$tagNameAttributes[$tagName])); |
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if (($tagName != 'TIME') || !empty($value)) { |
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return $value; |
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} |
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} |
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} |
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// Return the text content |
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return $element->textContent; |
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} |
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/** |
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* Return a thing by typeof value |
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* |
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* @param string|null $typeof Thing type |
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* @param string|null $resourceId Resource ID |
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* @param ContextInterface $context Context |
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* @return Thing Thing |
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* @throws RuntimeException If the default vocabulary is empty |
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*/ |
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protected function getThing($typeof, $resourceId, ContextInterface $context) |
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{ |
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/** @var TypeInterface[] $types */ |
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$types = []; |
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if (strlen($typeof)) { |
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foreach (preg_split('/\s+/', $typeof) as $prefixedType) { |
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$types[] = $this->getType($prefixedType, $context); |
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} |
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} |
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return new Thing($types, $resourceId); |
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} |
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/** |
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* Instanciate a type |
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* |
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* @param string $prefixedType Prefixed type |
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* @param ContextInterface $context Context |
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* @return TypeInterface Type |
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*/ |
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protected function getType($prefixedType, ContextInterface $context) |
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{ |
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list($prefix, $typeName) = $this->getPrefixName($prefixedType); |
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$vocabulary = $this->getVocabulary($prefix, $context); |
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if ($vocabulary instanceof VocabularyInterface) { |
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return new Type($typeName, $vocabulary); |
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} |
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// If the default vocabulary is empty |
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throw new RuntimeException( |
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RuntimeException::EMPTY_DEFAULT_VOCABULARY_STR, |
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RuntimeException::EMPTY_DEFAULT_VOCABULARY |
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); |
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} |
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/** |
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* Split a value into a vocabulary prefix and a name |
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* |
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* @param string $prefixName Prefixed name |
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* @return array Prefix and name |
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*/ |
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abstract protected function getPrefixName($prefixName); |
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} |
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