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<?php

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namespace Yoast\WP\SEO\Presentations;

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use Yoast\WP\SEO\Helpers\Pagination_Helper;

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use Yoast\WP\SEO\Models\Indexable;

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/**

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* Class Archive_Adjacent.

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* Presentation object for indexables.

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* @property Indexable $model The indexable.

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trait Archive_Adjacent {

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/**

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* Holds the Pagination_Helper instance.

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* @var Pagination_Helper

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protected $pagination;

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/**

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* Sets the helpers for the trait.

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* @required

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* @codeCoverageIgnore

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* @param Pagination_Helper $pagination The pagination helper.

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* @return void

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public function set_archive_adjacent_helpers( Pagination_Helper $pagination ) {

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$this->pagination = $pagination;

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}

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/**

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* Generates the rel prev.

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* @return string

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public function generate_rel_prev() {

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if ( $this->pagination->is_rel_adjacent_disabled() ) {

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return '';

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}

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$current_page = \max( 1, $this->pagination->get_current_archive_page_number() );

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// Check if there is a previous page.

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if ( $current_page === 1 ) {

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return '';

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}

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// Check if the previous page is the first page.

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if ( $current_page === 2 ) {

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return $this->permalink;

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}

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return $this->pagination->get_paginated_url( $this->permalink, ( $current_page - 1 ) );

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}

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/**

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* Generates the rel next.

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* @return string

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public function generate_rel_next() {

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if ( $this->pagination->is_rel_adjacent_disabled() ) {

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return '';

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}

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$current_page = \max( 1, $this->pagination->get_current_archive_page_number() );

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if ( $this->pagination->get_number_of_archive_pages() <= $current_page ) {

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return '';

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}

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return $this->pagination->get_paginated_url( $this->permalink, ( $current_page + 1 ) );

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}

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}

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