$sampleData ? wp_get_current_user()->display_name : $author->display_name;
			case 'author_url':
				$authorUrl = get_author_posts_url( $author->ID );

				return ! empty( $authorUrl ) ? $authorUrl : '';
			case 'attachment_caption':
				$caption = wp_get_attachment_caption( $postId );

				return empty( $caption ) && $sampleData ? __( 'Sample caption for media.', 'all-in-one-seo-pack' ) : $caption;
			case 'attachment_description':
				$description = ! empty( $post->post_content ) ? $post->post_content : '';

				return empty( $description ) && $sampleData ? __( 'Sample description for media.', 'all-in-one-seo-pack' ) : $description;
			case 'categories':
				if ( ! is_object( $post ) || 'post' !== $post->post_type ) {
					return ! is_object( $post ) && $sampleData ? __( 'Sample Category 1, Sample Category 2', 'all-in-one-seo-pack' ) : '';
				}
				$categories = get_the_terms( $post->ID, 'category' );

				$names = [];
				if ( ! is_array( $categories ) ) {
					return '';
				}

				foreach ( $categories as $category ) {
					$names[] = $category->name;
				}

				return implode( ', ', $names );
			case 'category_link':
				return '<a href="' . esc_url( get_category_link( $category ) ) . '">' . ( $category ? $category[0]->name : '' ) . '</a>';
			case 'category_link_alt':
				return '<a href="' . esc_url( get_category_link( $category ) ) . '">' . esc_url( get_category_link( $category ) ) . '</a>';
			case 'current_date':
				return $this->formatDateAsI18n( date_i18n( 'U' ) );
			case 'current_day':
				return date_i18n( 'd' );
			case 'current_month':
				return date_i18n( 'F' );
			case 'current_year':
				return date_i18n( 'Y' );
			case 'custom_field':
				return $sampleData ? __( 'Sample Custom Field Value', 'all-in-one-seo-pack' ) : '';
			case 'featured_image':
				if ( ! has_post_thumbnail( $postId ) ) {
					return $sampleData ? __( 'Sample featured image', 'all-in-one-seo-pack' ) : '';
				}

				$imageId = get_post_thumbnail_id( $postId );
				$image   = (array) wp_get_attachment_image_src( $imageId, 'full' );
				$image   = isset( $image[0] ) ? '<img src="' . $image[0] . '" style="display: block; margin: 1em auto">' : '';

				return $sampleData ? __( 'Sample featured image', 'all-in-one-seo-pack' ) : $image;
			case 'page_number':
				return aioseo()->helpers->getPageNumber();
			case 'parent_title':
				if ( ! is_object( $post ) || ! $post->post_parent ) {
					return ! is_object( $post ) && $sampleData ? __( 'Sample Parent', 'all-in-one-seo-pack' ) : '';
				}
				$parent = get_post( $post->post_parent );

				return $parent ? $parent->post_title : '';
			case 'permalink':
				return aioseo()->helpers->getUrl();
			case 'post_date':
				$date = $this->formatDateAsI18n( get_the_date( 'U' ) );

				return empty( $date ) && $sampleData ? $this->formatDateAsI18n( date_i18n( 'U' ) ) : $date;
			case 'post_day':
				$day = get_the_date( 'd', $post );

				return empty( $day ) && $sampleData ? date_i18n( 'd' ) : $day;
			case 'post_excerpt_only':
				return empty( $postId ) ? ( $sampleData ? __( 'Sample excerpt from a page/post.', 'all-in-one-seo-pack' ) : '' ) : $post->post_excerpt;
			case 'post_excerpt':
				if ( empty( $postId ) ) {
					return $sampleData ? __( 'Sample excerpt from a page/post.', 'all-in-one-seo-pack' ) : '';
				}

				if ( $post->post_excerpt ) {
					return $post->post_excerpt;
				}

				// Fall through if the post doesn't have an excerpt set. In that case getDescriptionFromContent() will generate it for us.
			case 'post_content':
				return empty( $postId ) ? ( $sampleData ? __( 'An example of content from your page/post.', 'all-in-one-seo-pack' ) : '' ) : aioseo()->helpers->getDescriptionFromContent( $post );
			case 'post_link':
				return '<a href="' . esc_url( get_permalink( $post ) ) . '">' . esc_html( get_the_title( $post ) ) . '</a>';
			case 'post_link_alt':
				return '<a href="' . esc_url( get_permalink( $post ) ) . '">' . esc_url( get_permalink( $post ) ) . '</a>';
			case 'post_month':
				$month = get_the_date( 'F', $post );

				return empty( $month ) && $sampleData ? date_i18n( 'F' ) : $month;
			case 'post_title':
				$title = esc_html( get_the_title( $post ) );

				return empty( $title ) && $sampleData ? __( 'Sample Post', 'all-in-one-seo-pack' ) : $title;
			case 'post_year':
				$year = get_the_date( 'Y', $post );

				return empty( $year ) && $sampleData ? date_i18n( 'Y' ) : $year;
			case 'search_term':
				$search = get_search_query();

				return empty( $search ) && $sampleData ? __( 'Example search string', 'all-in-one-seo-pack' ) : esc_attr( stripslashes( $search ) );
			case 'separator_sa':
				return aioseo()->helpers->decodeHtmlEntities( aioseo()->options->searchAppearance->global->separator );
			case 'site_link':
			case 'blog_link':
				return '<a href="' . esc_url( get_bloginfo( 'url' ) ) . '">' . esc_html( get_bloginfo( 'name' ) ) . '</a>';
			case 'site_link_alt':
				return '<a href="' . esc_url( get_bloginfo( 'url' ) ) . '">' . esc_url( get_bloginfo( 'url' ) ) . '</a>';
			case 'tag':
				return single_term_title( '', false );
			case 'tax_name':
				return $sampleData ? __( 'Sample Taxonomy Name Value', 'all-in-one-seo-pack' ) : '';
			case 'tax_parent_name':
				$termObject       = get_term( $id );
				$parentTermObject = ! empty( $termObject->parent ) ? get_term( $termObject->parent ) : '';
				$name             = is_a( $parentTermObject, 'WP_Term' ) && ! empty( $parentTermObject->name ) ? $parentTermObject->name : '';

				return $sampleData ? __( 'Sample Parent Term Name', 'all-in-one-seo-pack' ) : $name;
			case 'taxonomy_description':
				$description = term_description();

				return empty( $description ) && $sampleData ? __( 'Sample taxonomy description', 'all-in-one-seo-pack' ) : $description;
			case 'taxonomy_title':
			case 'category':
				$title = $this->getTaxonomyTitle( $postId );

				return ! $title && $sampleData ? __( 'Sample Taxonomy Title', 'all-in-one-seo-pack' ) : $title;
			case 'site_description':
			case 'blog_description':
			case 'tagline':
				return aioseo()->helpers->decodeHtmlEntities( get_bloginfo( 'description' ) );
			case 'site_title':
			case 'blog_title':
				return aioseo()->helpers->decodeHtmlEntities( get_bloginfo( 'name' ) );
			default:
				return '';
		}
	}

	/**
	 * Get the category title.
	 *
	 * @since 4.0.0
	 *
	 * @param  integer $postId The post ID if set.
	 * @return string          The category title.
	 */
	private function getTaxonomyTitle( $postId = null ) {
		$title = '';
		if ( aioseo()->helpers->isWooCommerceActive() && is_product_category() ) {
			$title = single_cat_title( '', false );
		} elseif ( is_category() ) {
			$title = single_cat_title( '', false );
		} elseif ( is_tag() ) {
			$title = single_tag_title( '', false );
		} elseif ( is_author() ) {
			$title = get_the_author();
		} elseif ( is_tax() ) {
			$title = single_term_title( '', false );
		} elseif ( is_post_type_archive() ) {
			$title = post_type_archive_title( '', false );
		} elseif ( is_archive() ) {
			$title = get_the_archive_title();
		}

		if ( $postId ) {
			$post           = aioseo()->helpers->getPost( $postId );
			$postTaxonomies = get_object_taxonomies( $post, 'objects' );
			$postTerms      = [];
			foreach ( $postTaxonomies as $taxonomySlug => $taxonomy ) {
				if ( ! $taxonomy->hierarchical ) {
					continue;
				}

				$primaryTerm = aioseo()->standalone->primaryTerm->getPrimaryTerm( $postId, $taxonomySlug );
				if ( $primaryTerm ) {
					$postTerms[] = get_term( $primaryTerm, $taxonomySlug );
					continue;
				}

				$postTaxonomyTerms = get_the_terms( $postId, $taxonomySlug );
				if ( is_array( $postTaxonomyTerms ) ) {
					$postTerms = array_merge( $postTerms, $postTaxonomyTerms );
				}
			}

			$title = $postTerms ? $postTerms[0]->name : '';

			if ( aioseo()->helpers->isWooCommerceActive() && is_product() ) {
				$terms = get_the_terms( $postId, 'product_cat' );
				$title = $terms ? $terms[0]->name : '';
			}
		}

		return wp_strip_all_tags( (string) $title );
	}

	/**
	 * Formatted Date
	 *
	 * Get formatted date based on WP options.
	 *
	 * @since 4.0.0
	 *
	 * @param  null|int    $date   Date in UNIX timestamp format. Otherwise, current time.
	 * @return string              Date internationalized.
	 */
	public function formatDateAsI18n( $date = null ) {
		if ( ! $date ) {
			$date = time();
		}

		$format        = get_option( 'date_format' );
		$formattedDate = date_i18n( $format, $date );

		return apply_filters(
			'aioseo_format_date',
			$formattedDate,
			[
				$date,
				$format
			]
		);
	}

	/**
	 * Parses custom taxonomy tags by replacing them with the name of the first assigned term of the given taxonomy.
	 *
	 * @since 4.0.0
	 *
	 * @param  string $string The string to parse.
	 * @return mixed          The new title.
	 */
	private function parseTaxonomyNames( $string, $id ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		$pattern = '/' . $this->denotationChar . 'tax_name-([a-zA-Z0-9_-]+)/im';
		$string  = preg_replace_callback( $pattern, [ $this, 'replaceTaxonomyName' ], $string );
		$pattern = '/' . $this->denotationChar . 'tax_name(?![a-zA-Z0-9_-])/im';

		return preg_replace( $pattern, '', $string );
	}

	/**
	 * Adds support for using #custom_field-[custom_field_title] for using
	 * custom fields / Advanced Custom Fields in titles / descriptions etc.
	 *
	 * @since 4.0.0
	 *
	 * @param  string $string The string to parse customs fields out of.
	 * @return mixed          The new title.
	 */
	public function parseCustomFields( $string ) {
		$pattern = '/' . $this->denotationChar . 'custom_field-([a-zA-Z0-9_-]+)/im';
		$string  = preg_replace_callback( $pattern, [ $this, 'replaceCustomField' ], $string );
		$pattern = '/' . $this->denotationChar . 'custom_field(?![a-zA-Z0-9_-])/im';

		return preg_replace( $pattern, '', $string );
	}

	/**
	 * Add context to our internal context.
	 *
	 * @since 4.0.0
	 *
	 * @param  array $context A context array to append.
	 * @return void
	 */
	public function addContext( $context ) {
		$this->context = array_merge( $this->context, $context );
	}

	/**
	 * Add tags to our internal tags.
	 *
	 * @since 4.0.0
	 *
	 * @param  array $tags A tags array to append.
	 * @return void
	 */
	public function addTags( $tags ) {
		$this->tags = array_merge( $this->tags, $tags );
	}

	/**
	 * Replaces a taxonomy name tag with its respective value.
	 *
	 * @since 4.0.0
	 *
	 * @param  array  $matches The matches.
	 * @return string          The replaced matches.
	 */
	private function replaceTaxonomyName( $matches ) {
		$termName = '';
		$post     = aioseo()->helpers->getPost();
		if ( ! empty( $matches[1] ) && $post ) {
			$taxonomy = get_taxonomy( $matches[1] );
			if ( ! $taxonomy ) {
				return '';
			}

			$term = aioseo()->standalone->primaryTerm->getPrimaryTerm( $post->ID, $taxonomy->name );
			if ( ! $term ) {
				$terms = get_the_terms( $post->ID, $taxonomy->name );
				if ( ! $terms || is_wp_error( $terms ) ) {
					return '';
				}

				$term = array_shift( $terms );
			}

			$termName = $term->name;
		}

		return '%|%' . $termName;
	}

	/**
	 * (ACF) Custom Field Replace.
	 *
	 * @since 4.0.0
	 *
	 * @param  array       $matches Array of matched values.
	 * @return bool|string          New title/text.
	 */
	private function replaceCustomField( $matches ) {
		$result = '';
		if ( ! empty( $matches ) ) {
			if ( ! empty( $matches[1] ) ) {
				if ( function_exists( 'get_field' ) ) {
					$result = get_field( $matches[1], get_queried_object() );
				}
				if ( empty( $result ) ) {
					global $post;
					if ( ! empty( $post ) ) {
						$result = get_post_meta( $post->ID, $matches[1], true );
					}
				}
			} else {
				$result = $matches[0];
			}
		}
		$result = wp_strip_all_tags( $result );

		return '%|%' . $result;
	}

	/**
	 * Get the default tags for the current post.
	 *
	 * @since 4.0.0
	 *
	 * @param  integer $postId The Post ID.
	 * @return array           An array of tags.
	 */
	public function getDefaultPostTags( $postId ) {
		$post = get_post( $postId );

		$title       = aioseo()->meta->title->getTitle( $post, true );
		$description = aioseo()->meta->description->getDescription( $post, true );

		return [
			'title'       => empty( $title ) ? '' : $title,
			'description' => empty( $description ) ? '' : $description
		];
	}
}