<?php

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namespace Yoast\WP\SEO\Builders;

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use DOMDocument;

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use WP_HTML_Tag_Processor;

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use WPSEO_Image_Utils;

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use Yoast\WP\SEO\Helpers\Image_Helper;

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use Yoast\WP\SEO\Helpers\Indexable_Helper;

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use Yoast\WP\SEO\Helpers\Options_Helper;

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use Yoast\WP\SEO\Helpers\Post_Helper;

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use Yoast\WP\SEO\Helpers\Url_Helper;

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use Yoast\WP\SEO\Models\Indexable;

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use Yoast\WP\SEO\Models\SEO_Links;

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use Yoast\WP\SEO\Repositories\Indexable_Repository;

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use Yoast\WP\SEO\Repositories\SEO_Links_Repository;

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/**

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* Indexable link builder.

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*/

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class Indexable_Link_Builder {

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/**

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* The SEO links repository.

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*

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* @var SEO_Links_Repository

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*/

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protected $seo_links_repository;

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/**

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* The url helper.

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*

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* @var Url_Helper

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*/

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protected $url_helper;

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/**

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* The image helper.

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*

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* @var Image_Helper

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*/

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protected $image_helper;

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/**

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* The indexable helper.

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*

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* @var Indexable_Helper

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*/

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protected $indexable_helper;

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/**

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* The post helper.

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*

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* @var Post_Helper

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*/

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protected $post_helper;

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/**

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* The options helper.

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*

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* @var Options_Helper

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*/

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protected $options_helper;

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/**

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* The indexable repository.

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*

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* @var Indexable_Repository

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*/

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protected $indexable_repository;

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/**

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* Indexable_Link_Builder constructor.

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*

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* @param SEO_Links_Repository $seo_links_repository The SEO links repository.

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* @param Url_Helper $url_helper The URL helper.

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* @param Post_Helper $post_helper The post helper.

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* @param Options_Helper $options_helper The options helper.

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* @param Indexable_Helper $indexable_helper The indexable helper.

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*/

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public function __construct(

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SEO_Links_Repository $seo_links_repository,

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Url_Helper $url_helper,

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Post_Helper $post_helper,

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Options_Helper $options_helper,

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Indexable_Helper $indexable_helper

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) {

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$this->seo_links_repository = $seo_links_repository;

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$this->url_helper = $url_helper;

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$this->post_helper = $post_helper;

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$this->options_helper = $options_helper;

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$this->indexable_helper = $indexable_helper;

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}

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/**

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* Sets the indexable repository.

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*

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* @required

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*

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* @param Indexable_Repository $indexable_repository The indexable repository.

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* @param Image_Helper $image_helper The image helper.

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*

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* @return void

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*/

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public function set_dependencies(

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Indexable_Repository $indexable_repository,

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Image_Helper $image_helper

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) {

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$this->indexable_repository = $indexable_repository;

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$this->image_helper = $image_helper;

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}

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/**

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* Builds the links for a post.

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*

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* @param Indexable $indexable The indexable.

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* @param string $content The content. Expected to be unfiltered.

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*

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* @return SEO_Links[] The created SEO links.

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*/

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public function build( $indexable, $content ) {

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if ( ! $this->indexable_helper->should_index_indexable( $indexable ) ) {

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return [];

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}

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global $post;

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if ( $indexable->object_type === 'post' ) {

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$post_backup = $post;

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// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- To setup the post we need to do this explicitly.

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$post = $this->post_helper->get_post( $indexable->object_id );

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\setup_postdata( $post );

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$content = \apply_filters( 'the_content', $content );

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\wp_reset_postdata();

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// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- To setup the post we need to do this explicitly.

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$post = $post_backup;

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}

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$content = \str_replace( ']]>', ']]&gt;', $content );

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$links = $this->gather_links( $content );

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$images = $this->gather_images( $content );

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if ( empty( $links ) && empty( $images ) ) {

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$indexable->link_count = 0;

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$this->update_related_indexables( $indexable, [] );

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return [];

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}

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$links = $this->create_links( $indexable, $links, $images );

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$this->update_related_indexables( $indexable, $links );

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$indexable->link_count = $this->get_internal_link_count( $links );

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return $links;

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}

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/**

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* Deletes all SEO links for an indexable.

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*

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* @param Indexable $indexable The indexable.

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*

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* @return void

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*/

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public function delete( $indexable ) {

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$links = ( $this->seo_links_repository->find_all_by_indexable_id( $indexable->id ) );

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$this->seo_links_repository->delete_all_by_indexable_id( $indexable->id );

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$linked_indexable_ids = [];

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foreach ( $links as $link ) {

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if ( $link->target_indexable_id ) {

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$linked_indexable_ids[] = $link->target_indexable_id;

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}

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}

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$this->update_incoming_links_for_related_indexables( $linked_indexable_ids );

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}

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/**

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* Fixes existing SEO links that are supposed to have a target indexable but don't, because of prior indexable

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* cleanup.

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*

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* @param Indexable $indexable The indexable to be the target of SEO Links.

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*

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* @return void

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*/

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public function patch_seo_links( Indexable $indexable ) {

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if ( ! empty( $indexable->id ) && ! empty( $indexable->object_id ) ) {

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$links = $this->seo_links_repository->find_all_by_target_post_id( $indexable->object_id );

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$updated_indexable = false;

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foreach ( $links as $link ) {

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if ( \is_a( $link, SEO_Links::class ) && empty( $link->target_indexable_id ) ) {

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// Since that post ID exists in an SEO link but has no target_indexable_id, it's probably because of prior indexable cleanup.

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$this->seo_links_repository->update_target_indexable_id( $link->id, $indexable->id );

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$updated_indexable = true;

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}

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}

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if ( $updated_indexable ) {

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$updated_indexable_id = [ $indexable->id ];

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$this->update_incoming_links_for_related_indexables( $updated_indexable_id );

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}

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}

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}

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/**

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* Gathers all links from content.

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*

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* @param string $content The content.

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*

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* @return string[] An array of urls.

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*/

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protected function gather_links( $content ) {

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if ( \strpos( $content, 'href' ) === false ) {

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// Nothing to do.

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return [];

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}

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$links = [];

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$regexp = '<a\s[^>]*href=("??)([^" >]*?)\1[^>]*>';

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// Used modifiers iU to match case insensitive and make greedy quantifiers lazy.

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if ( \preg_match_all( "/$regexp/iU", $content, $matches, \PREG_SET_ORDER ) ) {

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foreach ( $matches as $match ) {

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$links[] = \trim( $match[2], "'" );

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}

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}

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return $links;

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}

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/**

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* Gathers all images from content with WP's WP_HTML_Tag_Processor() and returns them along with their IDs, if

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* possible.

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*

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* @param string $content The content.

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*

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* @return int[] An associated array of image IDs, keyed by their URL.

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*/

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protected function gather_images_wp( $content ) {

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$processor = new WP_HTML_Tag_Processor( $content );

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$images = [];

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$query = [

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'tag_name' => 'img',

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];

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/**

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* Filter 'wpseo_image_attribute_containing_id' - Allows filtering what attribute will be used to extract image IDs from.

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*

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* Defaults to "class", which is where WP natively stores the image IDs, in a `wp-image-<ID>` format.

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*

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* @api string The attribute to be used to extract image IDs from.

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*/

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$attribute = \apply_filters( 'wpseo_image_attribute_containing_id', 'class' );

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while ( $processor->next_tag( $query ) ) {

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$src = \htmlentities( $processor->get_attribute( 'src' ), ( \ENT_QUOTES | \ENT_SUBSTITUTE | \ENT_HTML401 ), \get_bloginfo( 'charset' ) );

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$classes = $processor->get_attribute( $attribute );

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$id = $this->extract_id_of_classes( $classes );

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$images[ $src ] = $id;

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}

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return $images;

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}

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/**

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* Gathers all images from content with DOMDocument() and returns them along with their IDs, if possible.

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*

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* @param string $content The content.

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*

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* @return int[] An associated array of image IDs, keyed by their URL.

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*/

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protected function gather_images_domdocument( $content ) {

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$images = [];

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$charset = \get_bloginfo( 'charset' );

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/**

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* Filter 'wpseo_image_attribute_containing_id' - Allows filtering what attribute will be used to extract image IDs from.

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*

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* Defaults to "class", which is where WP natively stores the image IDs, in a `wp-image-<ID>` format.

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*

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* @api string The attribute to be used to extract image IDs from.

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*/

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$attribute = \apply_filters( 'wpseo_image_attribute_containing_id', 'class' );

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\libxml_use_internal_errors( true );

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$post_dom = new DOMDocument();

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$post_dom->loadHTML( '<?xml encoding="' . $charset . '">' . $content );

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\libxml_clear_errors();

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foreach ( $post_dom->getElementsByTagName( 'img' ) as $img ) {

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$src = \htmlentities( $img->getAttribute( 'src' ), ( \ENT_QUOTES | \ENT_SUBSTITUTE | \ENT_HTML401 ), $charset );

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$classes = $img->getAttribute( $attribute );

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$id = $this->extract_id_of_classes( $classes );

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$images[ $src ] = $id;

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}

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return $images;

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}

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/**

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* Extracts image ID out of the image's classes.

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*

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* @param string $classes The classes assigned to the image.

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*

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* @return int The ID that's extracted from the classes.

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*/

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protected function extract_id_of_classes( $classes ) {

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if ( ! $classes ) {

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return 0;

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}

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/**

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* Filter 'wpseo_extract_id_pattern' - Allows filtering the regex patern to be used to extract image IDs from class/attribute names.

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*

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* Defaults to the pattern that extracts image IDs from core's `wp-image-<ID>` native format in image classes.

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*

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* @api string The regex pattern to be used to extract image IDs from class names. Empty string if the whole class/attribute should be returned.

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*/

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$pattern = \apply_filters( 'wpseo_extract_id_pattern', '/(?<!\S)wp-image-(\d+)(?!\S)/i' );

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if ( $pattern === '' ) {

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return (int) $classes;

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}

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$matches = [];

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if ( \preg_match( $pattern, $classes, $matches ) ) {

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return (int) $matches[1];

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}

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return 0;

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}

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/**

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* Gathers all images from content.

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*

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* @param string $content The content.

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*

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* @return int[] An associated array of image IDs, keyed by their URLs.

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*/

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protected function gather_images( $content ) {

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/**

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* Filter 'wpseo_force_creating_and_using_attachment_indexables' - Filters if we should use attachment indexables to find all content images. Instead of scanning the content.

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*

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* The default value is false.

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*

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* @since 21.1

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*/

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$should_not_parse_content = \apply_filters( 'wpseo_force_creating_and_using_attachment_indexables', false );

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/**

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* Filter 'wpseo_force_skip_image_content_parsing' - Filters if we should force skip scanning the content to parse images.

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* This filter can be used if the regex gives a faster result than scanning the code.

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*

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* The default value is false.

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*

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* @since 21.1

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*/

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$should_not_parse_content = \apply_filters( 'wpseo_force_skip_image_content_parsing', $should_not_parse_content );

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if ( ! $should_not_parse_content && \class_exists( WP_HTML_Tag_Processor::class ) ) {

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return $this->gather_images_wp( $content );

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}

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if ( ! $should_not_parse_content && \class_exists( DOMDocument::class ) ) {

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return $this->gather_images_DOMDocument( $content );

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}

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if ( \strpos( $content, 'src' ) === false ) {

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// Nothing to do.

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return [];

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}

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$images = [];

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$regexp = '<img\s[^>]*src=("??)([^" >]*?)\\1[^>]*>';

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// Used modifiers iU to match case insensitive and make greedy quantifiers lazy.

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if ( \preg_match_all( "/$regexp/iU", $content, $matches, \PREG_SET_ORDER ) ) {

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foreach ( $matches as $match ) {

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$images[ $match[2] ] = 0;

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}

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}

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return $images;

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}

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/**

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* Creates link models from lists of URLs and image sources.

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*

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* @param Indexable $indexable The indexable.

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* @param string[] $links The link URLs.

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* @param int[] $images The image sources.

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*

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* @return SEO_Links[] The link models.

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*/

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protected function create_links( $indexable, $links, $images ) {

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$home_url = \wp_parse_url( \home_url() );

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$current_url = \wp_parse_url( $indexable->permalink );

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$links = \array_map(

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function ( $link ) use ( $home_url, $indexable ) {

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return $this->create_internal_link( $link, $home_url, $indexable );

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},

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$links

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);

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// Filter out links to the same page with a fragment or query.

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$links = \array_filter(

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$links,

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function ( $link ) use ( $current_url ) {

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return $this->filter_link( $link, $current_url );

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}

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);

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$image_links = [];

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foreach ( $images as $image_url => $image_id ) {

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$image_links[] = $this->create_internal_link( $image_url, $home_url, $indexable, true, $image_id );

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}

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return \array_merge( $links, $image_links );

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}

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/**

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* Get the post ID based on the link's type and its target's permalink.

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*

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* @param string $type The type of link (either SEO_Links::TYPE_INTERNAL or SEO_Links::TYPE_INTERNAL_IMAGE).

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* @param string $permalink The permalink of the link's target.

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*

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* @return int The post ID.

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*/

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protected function get_post_id( $type, $permalink ) {

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if ( $type === SEO_Links::TYPE_INTERNAL ) {

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return \url_to_postid( $permalink );

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}

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return $this->image_helper->get_attachment_by_url( $permalink );

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}

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/**

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* Creates an internal link.

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*

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* @param string $url The url of the link.

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* @param array $home_url The home url, as parsed by wp_parse_url.

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* @param Indexable $indexable The indexable of the post containing the link.

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* @param bool $is_image Whether or not the link is an image.

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* @param int $image_id The ID of the internal image.

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*

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* @return SEO_Links The created link.

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*/

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protected function create_internal_link( $url, $home_url, $indexable, $is_image = false, $image_id = 0 ) {

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$parsed_url = \wp_parse_url( $url );

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$link_type = $this->url_helper->get_link_type( $parsed_url, $home_url, $is_image );

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/**

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* ORM representing a link in the SEO Links table.

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*

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* @var SEO_Links $model

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*/

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$model = $this->seo_links_repository->query()->create(

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[

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'url' => $url,

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'type' => $link_type,

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'indexable_id' => $indexable->id,

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'post_id' => $indexable->object_id,

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]

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);

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$model->parsed_url = $parsed_url;

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if ( $model->type === SEO_Links::TYPE_INTERNAL ) {

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$permalink = $this->build_permalink( $url, $home_url );

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return $this->enhance_link_from_indexable( $model, $permalink );

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}

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if ( $model->type === SEO_Links::TYPE_INTERNAL_IMAGE ) {

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$permalink = $this->build_permalink( $url, $home_url );

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/** The `wpseo_force_creating_and_using_attachment_indexables` filter is documented in indexable-link-builder.php */

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if ( ! $this->options_helper->get( 'disable-attachment' ) || \apply_filters( 'wpseo_force_creating_and_using_attachment_indexables', false ) ) {

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$model = $this->enhance_link_from_indexable( $model, $permalink );

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}

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else {

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$target_post_id = ( $image_id !== 0 ) ? $image_id : WPSEO_Image_Utils::get_attachment_by_url( $permalink );

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if ( ! empty( $target_post_id ) ) {

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$model->target_post_id = $target_post_id;

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}

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}

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if ( $model->target_post_id ) {

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$file = \get_attached_file( $model->target_post_id );

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if ( $file ) {

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if ( \file_exists( $file ) ) {

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$model->size = \filesize( $file );

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}

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else {

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$model->size = null;

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