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<?php

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namespace Yoast\WP\SEO\Presenters;

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use Yoast\WP\SEO\Presentations\Indexable_Presentation;

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/**

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* Presenter class for the breadcrumbs.

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class Breadcrumbs_Presenter extends Abstract_Indexable_Presenter {

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/**

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* The id attribute.

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* @var string

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private $id;

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/**

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* The class name attribute.

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* @var string

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private $class;

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/**

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* The wrapper element name.

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* @var string

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private $wrapper;

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/**

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* Separator to use.

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* @var string

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private $separator;

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/**

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* The element.

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* @var string

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private $element;

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/**

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* Presents the breadcrumbs.

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* @return string The breadcrumbs HTML.

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public function present() {

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$breadcrumbs = $this->get();

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if ( ! \is_array( $breadcrumbs ) || empty( $breadcrumbs ) ) {

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return '';

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}

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$links = [];

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$total = \count( $breadcrumbs );

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foreach ( $breadcrumbs as $index => $breadcrumb ) {

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$links[ $index ] = $this->crumb_to_link( $breadcrumb, $index, $total );

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}

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// Removes any effectively empty links.

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$links = \array_map( 'trim', $links );

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$links = \array_filter( $links );

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$output = \implode( $this->get_separator(), $links );

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if ( empty( $output ) ) {

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return '';

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}

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$output = '<' . $this->get_wrapper() . $this->get_id() . $this->get_class() . '>' . $output . '</' . $this->get_wrapper() . '>';

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$output = $this->filter( $output );

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$prefix = $this->helpers->options->get( 'breadcrumbs-prefix' );

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if ( $prefix !== '' ) {

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$output = "\t" . $prefix . "\n" . $output;

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}

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return $output;

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}

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/**

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* Gets the raw value of a presentation.

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* @return array The raw value.

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public function get() {

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return $this->presentation->breadcrumbs;

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}

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/**

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* Filters the output.

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* @param string $output The HTML output.

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* @return string The filtered output.

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protected function filter( $output ) {

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/**

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* Filter: 'wpseo_breadcrumb_output' - Allow changing the HTML output of the Yoast SEO breadcrumbs class.

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* @param string $output The HTML output.

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* @param Indexable_Presentation $presentation The presentation of an indexable.

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return \apply_filters( 'wpseo_breadcrumb_output', $output, $this->presentation );

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}

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/**

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* Create a breadcrumb element string.

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* @param array $breadcrumb Link info array containing the keys:

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* 'text' => (string) link text.

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* 'url' => (string) link url.

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* (optional) 'title' => (string) link title attribute text.

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* @param int $index Index for the current breadcrumb.

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* @param int $total The total number of breadcrumbs.

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* @return string The breadcrumb link.

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protected function crumb_to_link( $breadcrumb, $index, $total ) {

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$link = '';

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if ( ! isset( $breadcrumb['text'] ) || ! \is_string( $breadcrumb['text'] ) || empty( $breadcrumb['text'] ) ) {

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return $link;

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}

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$text = \trim( $breadcrumb['text'] );

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if (

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$index < ( $total - 1 )

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&& isset( $breadcrumb['url'] )

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&& \is_string( $breadcrumb['url'] )

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&& ! empty( $breadcrumb['url'] )

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) {

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// If it's not the last element and we have a url.

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$link .= '<' . $this->get_element() . '>';

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$title_attr = isset( $breadcrumb['title'] ) ? ' title="' . \esc_attr( $breadcrumb['title'] ) . '"' : '';

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$link .= '<a href="' . \esc_url( $breadcrumb['url'] ) . '"' . $title_attr . '>' . $text . '</a>';

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$link .= '</' . $this->get_element() . '>';

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}

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elseif ( $index === ( $total - 1 ) ) {

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// If it's the last element.

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if ( $this->helpers->options->get( 'breadcrumbs-boldlast' ) === true ) {

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$text = '<strong>' . $text . '</strong>';

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}

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$link .= '<' . $this->get_element() . ' class="breadcrumb_last" aria-current="page">' . $text . '</' . $this->get_element() . '>';

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}

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else {

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// It's not the last element and has no url.

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$link .= '<' . $this->get_element() . '>' . $text . '</' . $this->get_element() . '>';

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}

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/**

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* Filter: 'wpseo_breadcrumb_single_link' - Allow changing of each link being put out by the Yoast SEO breadcrumbs class.

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* @param string $link_output The output string.

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* @param array $link The breadcrumb link array.

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return \apply_filters( 'wpseo_breadcrumb_single_link', $link, $breadcrumb );

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}

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/**

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* Retrieves HTML ID attribute.

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* @return string The id attribute.

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protected function get_id() {

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if ( ! $this->id ) {

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/**

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* Filter: 'wpseo_breadcrumb_output_id' - Allow changing the HTML ID on the Yoast SEO breadcrumbs wrapper element.

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* @param string $unsigned ID to add to the wrapper element.

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$this->id = \apply_filters( 'wpseo_breadcrumb_output_id', '' );

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if ( ! \is_string( $this->id ) ) {

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return '';

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}

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if ( $this->id !== '' ) {

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$this->id = ' id="' . \esc_attr( $this->id ) . '"';

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}

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}

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return $this->id;

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}

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/**

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* Retrieves HTML Class attribute.

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* @return string The class attribute.

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protected function get_class() {

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if ( ! $this->class ) {

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/**

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* Filter: 'wpseo_breadcrumb_output_class' - Allow changing the HTML class on the Yoast SEO breadcrumbs wrapper element.

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* @param string $unsigned Class to add to the wrapper element.

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$this->class = \apply_filters( 'wpseo_breadcrumb_output_class', '' );

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if ( ! \is_string( $this->class ) ) {

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return '';

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}

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if ( $this->class !== '' ) {

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$this->class = ' class="' . \esc_attr( $this->class ) . '"';

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}

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}

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return $this->class;

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}

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/**

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* Retrieves the wrapper element name.

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* @return string The wrapper element name.

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protected function get_wrapper() {

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if ( ! $this->wrapper ) {

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$this->wrapper = \apply_filters( 'wpseo_breadcrumb_output_wrapper', 'span' );

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$this->wrapper = \tag_escape( $this->wrapper );

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if ( ! \is_string( $this->wrapper ) || $this->wrapper === '' ) {

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$this->wrapper = 'span';

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}

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}

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return $this->wrapper;

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}

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/**

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* Retrieves the separator.

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* @return string The separator.

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protected function get_separator() {

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if ( ! $this->separator ) {

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$this->separator = \apply_filters( 'wpseo_breadcrumb_separator', $this->helpers->options->get( 'breadcrumbs-sep' ) );

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$this->separator = ' ' . $this->separator . ' ';

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}

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return $this->separator;

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}

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/**

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* Retrieves the crumb element name.

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* @return string The element to use.

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protected function get_element() {

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if ( ! $this->element ) {

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$this->element = \esc_attr( \apply_filters( 'wpseo_breadcrumb_single_link_wrapper', 'span' ) );

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}

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return $this->element;

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}

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}

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