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<?php

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namespace Yoast\WP\SEO\Presenters;

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use WPSEO_Replace_Vars;

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use Yoast\WP\SEO\Presentations\Indexable_Presentation;

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use Yoast\WP\SEO\Surfaces\Helpers_Surface;

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/**

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* Abstract presenter class for indexable presentations.

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abstract class Abstract_Indexable_Presenter extends Abstract_Presenter {

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/**

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* The WPSEO Replace Vars object.

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* @var WPSEO_Replace_Vars

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public $replace_vars;

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/**

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* The indexable presentation.

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* @var Indexable_Presentation

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public $presentation;

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/**

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* The helpers surface

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* @var Helpers_Surface

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public $helpers;

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/**

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* The tag key name.

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* @var string

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protected $key = 'NO KEY PROVIDED';

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/**

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* Gets the raw value of a presentation.

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* @return string|array The raw value.

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abstract public function get();

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/**

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* Transforms an indexable presenter's key to a json safe key string.

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* @return string|null

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public function escape_key() {

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if ( $this->key === 'NO KEY PROVIDED' ) {

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return null;

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}

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return \str_replace( [ ':', ' ', '-' ], '_', $this->key );

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}

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/**

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* Returns the metafield's property key.

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* @return string The property key.

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public function get_key() {

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return $this->key;

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}

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/**

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* Replace replacement variables in a string.

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* @param string $replacevar_string The string with replacement variables.

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* @return string The string with replacement variables replaced.

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protected function replace_vars( $replacevar_string ) {

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return $this->replace_vars->replace( $replacevar_string, $this->presentation->source );

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}

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}

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