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namespace Yoast\WP\SEO\Generators\Schema;

use WP_User;
use Yoast\WP\SEO\Config\Schema_IDs;

/**
 * Returns schema Article data.
 */
class Article extends Abstract_Schema_Piece {

	/**
	 * Determines whether or not a piece should be added to the graph.
	 *
	 * @return bool
	 */
	public function is_needed() {
		if ( $this-&gt;context-&gt;indexable-&gt;object_type !== 'post' ) {
			return false;
		}

		// If we cannot output a publisher, we shouldn't output an Article.
		if ( $this-&gt;context-&gt;site_represents === false ) {
			return false;
		}

		// If we cannot output an author, we shouldn't output an Article.
		if ( ! $this-&gt;helpers-&gt;schema-&gt;article-&gt;is_author_supported( $this-&gt;context-&gt;indexable-&gt;object_sub_type ) ) {
			return false;
		}

		if ( $this-&gt;context-&gt;schema_article_type !== 'None' ) {
			$this-&gt;context-&gt;has_article = true;
			return true;
		}

		return false;
	}

	/**
	 * Returns Article data.
	 *
	 * @return array Article data.
	 */
	public function generate() {
		$author = \get_userdata( $this-&gt;context-&gt;post-&gt;post_author );
		$data   = [
			'@type'            =&gt; $this-&gt;context-&gt;schema_article_type,
			'@id'              =&gt; $this-&gt;context-&gt;canonical . Schema_IDs::ARTICLE_HASH,
			'isPartOf'         =&gt; [ '@id' =&gt; $this-&gt;context-&gt;main_schema_id ],
			'author'           =&gt; [
				'name' =&gt; ( $author instanceof WP_User ) ? $this-&gt;helpers-&gt;schema-&gt;html-&gt;smart_strip_tags( $author-&gt;display_name ) : '',
				'@id'  =&gt; $this-&gt;helpers-&gt;schema-&gt;id-&gt;get_user_schema_id( $this-&gt;context-&gt;post-&gt;post_author, $this-&gt;context ),
			],
			'headline'         =&gt; $this-&gt;helpers-&gt;schema-&gt;html-&gt;smart_strip_tags( $this-&gt;helpers-&gt;post-&gt;get_post_title_with_fallback( $this-&gt;context-&gt;id ) ),
			'datePublished'    =&gt; $this-&gt;helpers-&gt;date-&gt;format( $this-&gt;context-&gt;post-&gt;post_date_gmt ),
			'dateModified'     =&gt; $this-&gt;helpers-&gt;date-&gt;format( $this-&gt;context-&gt;post-&gt;post_modified_gmt ),
			'mainEntityOfPage' =&gt; [ '@id' =&gt; $this-&gt;context-&gt;main_schema_id ],
			'wordCount'        =&gt; $this-&gt;word_count( $this-&gt;context-&gt;post-&gt;post_content, $this-&gt;context-&gt;post-&gt;post_title ),
		];

		if ( $this-&gt;context-&gt;post-&gt;comment_status === 'open' ) {
			$data['commentCount'] = \intval( $this-&gt;context-&gt;post-&gt;comment_count, 10 );
		}

		if ( $this-&gt;context-&gt;site_represents_reference ) {
			$data['publisher'] = $this-&gt;context-&gt;site_represents_reference;
		}

		$data = $this-&gt;add_image( $data );
		$data = $this-&gt;add_keywords( $data );
		$data = $this-&gt;add_sections( $data );
		$data = $this-&gt;helpers-&gt;schema-&gt;language-&gt;add_piece_language( $data );

		if ( \post_type_supports( $this-&gt;context-&gt;post-&gt;post_type, 'comments' ) &amp;&amp; $this-&gt;context-&gt;post-&gt;comment_status === 'open' ) {
			$data = $this-&gt;add_potential_action( $data );
		}

		return $data;
	}

	/**
	 * Adds tags as keywords, if tags are assigned.
	 *
	 * @param array $data Article data.
	 *
	 * @return array Article data.
	 */
	private function add_keywords( $data ) {
		/**
		 * Filter: 'wpseo_schema_article_keywords_taxonomy' - Allow changing the taxonomy used to assign keywords to a post type Article data.
		 *
		 * @api string $taxonomy The chosen taxonomy.
		 */
		$taxonomy = \apply_filters( 'wpseo_schema_article_keywords_taxonomy', 'post_tag' );

		return $this-&gt;add_terms( $data, 'keywords', $taxonomy );
	}

	/**
	 * Adds categories as sections, if categories are assigned.
	 *
	 * @param array $data Article data.
	 *
	 * @return array Article data.
	 */
	private function add_sections( $data ) {
		/**
		 * Filter: 'wpseo_schema_article_sections_taxonomy' - Allow changing the taxonomy used to assign keywords to a post type Article data.
		 *
		 * @api string $taxonomy The chosen taxonomy.
		 */
		$taxonomy = \apply_filters( 'wpseo_schema_article_sections_taxonomy', 'category' );

		return $this-&gt;add_terms( $data, 'articleSection', $taxonomy );
	}

	/**
	 * Adds a term or multiple terms, comma separated, to a field.
	 *
	 * @param array  $data     Article data.
	 * @param string $key      The key in data to save the terms in.
	 * @param string $taxonomy The taxonomy to retrieve the terms from.
	 *
	 * @return mixed Article data.
	 */
	protected function add_terms( $data, $key, $taxonomy ) {
		$terms = \get_the_terms( $this-&gt;context-&gt;id, $taxonomy );

		if ( ! \is_array( $terms ) ) {
			return $data;
		}

		$callback = static function( $term ) {
			// We are using the WordPress internal translation.
			return $term-&gt;name !== \__( 'Uncategorized', 'default' );
		};
		$terms    = \array_filter( $terms, $callback );

		if ( empty( $terms ) ) {
			return $data;
		}

		$data[ $key ] = \wp_list_pluck( $terms, 'name' );

		return $data;
	}

	/**
	 * Adds an image node if the post has a featured image.
	 *
	 * @param array $data The Article data.
	 *
	 * @return array The Article data.
	 */
	private function add_image( $data ) {
		if ( $this-&gt;context-&gt;main_image_url !== null ) {
			$data['image']        = [
				'@id' =&gt; $this-&gt;context-&gt;canonical . Schema_IDs::PRIMARY_IMAGE_HASH,
			];
			$data['thumbnailUrl'] = $this-&gt;context-&gt;main_image_url;
		}

		return $data;
	}

	/**
	 * Adds the potential action property to the Article Schema piece.
	 *
	 * @param array $data The Article data.
	 *
	 * @return array The Article data with the potential action added.
	 */
	private function add_potential_action( $data ) {
		/**
		 * Filter: 'wpseo_schema_article_potential_action_target' - Allows filtering of the schema Article potentialAction target.
		 *
		 * @api array $targets The URLs for the Article potentialAction target.
		 */
		$targets = \apply_filters( 'wpseo_schema_article_potential_action_target', [ $this-&gt;context-&gt;canonical . '#respond' ] );

		$data['potentialAction'][] = [
			'@type'  =&gt; 'CommentAction',
			'name'   =&gt; 'Comment',
			'target' =&gt; $targets,
		];

		return $data;
	}

	/**
	 * Does a simple word count but tries to be relatively smart about it.
	 *
	 * @param string $post_content The post content.
	 * @param string $post_title   The post title.
	 *
	 * @return int The number of words in the content.
	 */
	private function word_count( $post_content, $post_title = '' ) {
		// Add the title to our word count.
		$post_content = $post_title . ' ' . $post_content;

		// Strip pre/code blocks and their content.
		$post_content = \preg_replace( '@&lt;(pre|code)[^&gt;]*?&gt;.*?&lt;/\\1&gt;@si', '', $post_content );

		// Add space between tags that don't have it.
		$post_content = \preg_replace( '@&gt;&lt;@', '&gt; &lt;', $post_content );

		// Strips all other tags.
		$post_content = \wp_strip_all_tags( $post_content );

		$characters = '';

		if ( \preg_match( '@[а-я]@ui', $post_content ) ) {
			// Correct counting of the number of words in the Russian and Ukrainian languages.
			$alphabet = [
				'ru' =&gt; 'абвгдеёжзийклмнопрстуфхцчшщъыьэюя',
				'ua' =&gt; 'абвгґдеєжзиіїйклмнопрстуфхцчшщьюя',
			];

			$characters  = \implode( '', $alphabet );
			$characters  = \preg_split( '//u', $characters, -1, \PREG_SPLIT_NO_EMPTY );
			$characters  = \array_unique( $characters );
			$characters  = \implode( '', $characters );
			$characters .= \mb_strtoupper( $characters );
		}

		// Remove characters from HTML entities.
		$post_content = \preg_replace( '@&amp;[a-z0-9]+;@i', ' ', \htmlentities( $post_content ) );

		return \str_word_count( $post_content, 0, $characters );
	}
}
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