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<?php

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namespace Yoast\WP\SEO\Integrations\Front_End;

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use Yoast\WP\SEO\Conditionals\Front_End_Conditional;

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use Yoast\WP\SEO\Context\Meta_Tags_Context;

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use Yoast\WP\SEO\Generators\Schema\Abstract_Schema_Piece;

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use Yoast\WP\SEO\Generators\Schema\Article;

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use Yoast\WP\SEO\Integrations\Integration_Interface;

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/**

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* Adds the table of contents accessibility feature to the article piece with a fallback to the webpage piece.

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class Schema_Accessibility_Feature implements Integration_Interface {

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/**

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* Returns the conditionals based in which this loadable should be active.

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* @return array

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public static function get_conditionals() {

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return [ Front_End_Conditional::class ];

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}

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/**

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* Initializes the integration.

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* This is the place to register hooks and filters.

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* @return void

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public function register_hooks() {

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\add_filter( 'wpseo_schema_webpage', [ $this, 'maybe_add_accessibility_feature' ], 10, 4 );

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\add_filter( 'wpseo_schema_article', [ $this, 'add_accessibility_feature' ], 10, 2 );

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}

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/**

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* Adds the accessibility feature to the webpage if there is no article.

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* @param array $piece The graph piece.

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* @param Meta_Tags_Context $context The context.

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* @param Abstract_Schema_Piece $the_generator The current schema generator.

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* @param Abstract_Schema_Piece[] $generators The schema generators.

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* @return array The graph piece.

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public function maybe_add_accessibility_feature( $piece, $context, $the_generator, $generators ) {

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foreach ( $generators as $generator ) {

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if ( \is_a( $generator, Article::class ) && $generator->is_needed() ) {

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return $piece;

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}

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}

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return $this->add_accessibility_feature( $piece, $context );

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}

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/**

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* Adds the accessibility feature to a schema graph piece.

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* @param array $piece The schema piece.

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* @param Meta_Tags_Context $context The context.

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* @return array The graph piece.

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public function add_accessibility_feature( $piece, $context ) {

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if ( empty( $context->blocks['yoast-seo/table-of-contents'] ) ) {

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return $piece;

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}

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if ( isset( $piece['accessibilityFeature'] ) ) {

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$piece['accessibilityFeature'][] = 'tableOfContents';

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}

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else {

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$piece['accessibilityFeature'] = [

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'tableOfContents',

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];

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}

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return $piece;

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}

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}

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