TextProcessed.php

<?php

namespace Drupal\text;

use Drupal\Core\Cache\CacheableDependencyInterface;
use Drupal\Core\TypedData\DataDefinitionInterface;
use Drupal\Core\TypedData\TypedDataInterface;
use Drupal\Core\TypedData\TypedData;
use Drupal\filter\FilterProcessResult;
use Drupal\filter\Render\FilteredMarkup;

/**
 * A computed property for processing text with a format.
 *
 * Required settings (below the definition's 'settings' key) are:
 *  - text source: The text property containing the to be processed text.
 */
class TextProcessed extends TypedData implements CacheableDependencyInterface {
    
    /**
     * Cached processed text.
     *
     * @var \Drupal\filter\FilterProcessResult|null
     */
    protected $processed = NULL;
    
    /**
     * {@inheritdoc}
     */
    public function __construct(DataDefinitionInterface $definition, $name = NULL, ?TypedDataInterface $parent = NULL) {
        parent::__construct($definition, $name, $parent);
        if ($definition->getSetting('text source') === NULL) {
            throw new \InvalidArgumentException("The definition's 'text source' key has to specify the name of the text property to be processed.");
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getValue() {
        if ($this->processed !== NULL) {
            return FilteredMarkup::create($this->processed
                ->getProcessedText());
        }
        $item = $this->getParent();
        $text = $item->{$this->definition
            ->getSetting('text source')};
        // Avoid doing unnecessary work on empty strings.
        if (!isset($text) || $text === '') {
            $this->processed = new FilterProcessResult('');
        }
        else {
            $build = [
                '#type' => 'processed_text',
                '#text' => $text,
                '#format' => $item->format,
                '#filter_types_to_skip' => [],
                '#langcode' => $item->getLangcode(),
            ];
            // Capture the cacheability metadata associated with the processed text.
            $processed_text = $this->getRenderer()
                ->renderInIsolation($build);
            $this->processed = FilterProcessResult::createFromRenderArray($build)->setProcessedText((string) $processed_text);
        }
        return FilteredMarkup::create($this->processed
            ->getProcessedText());
    }
    
    /**
     * {@inheritdoc}
     */
    public function setValue($value, $notify = TRUE) {
        $this->processed = $value;
        // Notify the parent of any changes.
        if ($notify && isset($this->parent)) {
            $this->parent
                ->onChange($this->name);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheTags() {
        $this->getValue();
        return $this->processed
            ->getCacheTags();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        $this->getValue();
        return $this->processed
            ->getCacheContexts();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheMaxAge() {
        $this->getValue();
        return $this->processed
            ->getCacheMaxAge();
    }
    
    /**
     * Returns the renderer service.
     *
     * @return \Drupal\Core\Render\RendererInterface
     */
    protected function getRenderer() {
        return \Drupal::service('renderer');
    }

}