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namespace Yoast\WP\SEO\Presenters;

use Yoast\WP\SEO\Presentations\Indexable_Presentation;

/**
 * Presenter class for the breadcrumbs.
 */
class Breadcrumbs_Presenter extends Abstract_Indexable_Presenter {

	/**
	 * The id attribute.
	 *
	 * @var string
	 */
	private $id;

	/**
	 * The class name attribute.
	 *
	 * @var string
	 */
	private $class;

	/**
	 * The wrapper element name.
	 *
	 * @var string
	 */
	private $wrapper;

	/**
	 * Separator to use.
	 *
	 * @var string
	 */
	private $separator;

	/**
	 * The element.
	 *
	 * @var string
	 */
	private $element;

	/**
	 * Presents the breadcrumbs.
	 *
	 * @return string The breadcrumbs HTML.
	 */
	public function present() {
		$breadcrumbs = $this-&gt;get();
		if ( ! \is_array( $breadcrumbs ) || empty( $breadcrumbs ) ) {
			return '';
		}

		$links = [];
		$total = \count( $breadcrumbs );
		foreach ( $breadcrumbs as $index =&gt; $breadcrumb ) {
			$links[ $index ] = $this-&gt;crumb_to_link( $breadcrumb, $index, $total );
		}

		// Removes any effectively empty links.
		$links  = \array_map( 'trim', $links );
		$links  = \array_filter( $links );
		$output = \implode( $this-&gt;get_separator(), $links );

		if ( empty( $output ) ) {
			return '';
		}

		$output = '&lt;' . $this-&gt;get_wrapper() . $this-&gt;get_id() . $this-&gt;get_class() . '&gt;' . $output . '&lt;/' . $this-&gt;get_wrapper() . '&gt;';
		$output = $this-&gt;filter( $output );

		$prefix = $this-&gt;helpers-&gt;options-&gt;get( 'breadcrumbs-prefix' );
		if ( $prefix !== '' ) {
			$output = &quot;\t&quot; . $prefix . &quot;\n&quot; . $output;
		}

		return $output;
	}

	/**
	 * Gets the raw value of a presentation.
	 *
	 * @return array The raw value.
	 */
	public function get() {
		return $this-&gt;presentation-&gt;breadcrumbs;
	}

	/**
	 * Filters the output.
	 *
	 * @param string $output The HTML output.
	 *
	 * @return string The filtered output.
	 */
	protected function filter( $output ) {
		/**
		 * Filter: 'wpseo_breadcrumb_output' - Allow changing the HTML output of the Yoast SEO breadcrumbs class.
		 *
		 * @param Indexable_Presentation $presentation The presentation of an indexable.
		 *
		 * @api string $output The HTML output.
		 */
		return \apply_filters( 'wpseo_breadcrumb_output', $output, $this-&gt;presentation );
	}

	/**
	 * Create a breadcrumb element string.
	 *
	 * @param array $breadcrumb Link info array containing the keys:
	 *                          'text'                  =&gt; (string) link text.
	 *                          'url'                   =&gt; (string) link url.
	 *                          (optional) 'title'      =&gt; (string) link title attribute text.
	 * @param int   $index      Index for the current breadcrumb.
	 * @param int   $total      The total number of breadcrumbs.
	 *
	 * @return string The breadcrumb link.
	 */
	protected function crumb_to_link( $breadcrumb, $index, $total ) {
		$link = '';

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

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

		if (
			$index &lt; ( $total - 1 )
			&amp;&amp; isset( $breadcrumb['url'] )
			&amp;&amp; \is_string( $breadcrumb['url'] )
			&amp;&amp; ! empty( $breadcrumb['url'] )
		) {
			// If it's not the last element and we have a url.
			$link      .= '&lt;' . $this-&gt;get_element() . '&gt;';
			$title_attr = isset( $breadcrumb['title'] ) ? ' title=&quot;' . \esc_attr( $breadcrumb['title'] ) . '&quot;' : '';
			$link      .= '&lt;a href=&quot;' . \esc_url( $breadcrumb['url'] ) . '&quot;' . $title_attr . '&gt;' . $text . '&lt;/a&gt;';
			$link      .= '&lt;/' . $this-&gt;get_element() . '&gt;';
		}
		elseif ( $index === ( $total - 1 ) ) {
			// If it's the last element.

			if ( $this-&gt;helpers-&gt;options-&gt;get( 'breadcrumbs-boldlast' ) === true ) {
				$text = '&lt;strong&gt;' . $text . '&lt;/strong&gt;';
			}

			$link .= '&lt;' . $this-&gt;get_element() . ' class=&quot;breadcrumb_last&quot; aria-current=&quot;page&quot;&gt;' . $text . '&lt;/' . $this-&gt;get_element() . '&gt;';
		}
		else {
			// It's not the last element and has no url.
			$link .= '&lt;' . $this-&gt;get_element() . '&gt;' . $text . '&lt;/' . $this-&gt;get_element() . '&gt;';
		}

		/**
		 * Filter: 'wpseo_breadcrumb_single_link' - Allow changing of each link being put out by the Yoast SEO breadcrumbs class.
		 *
		 * @param array $link The link array.
		 *
		 * @api string $link_output The output string.
		 */
		return \apply_filters( 'wpseo_breadcrumb_single_link', $link, $breadcrumb );
	}

	/**
	 * Retrieves HTML ID attribute.
	 *
	 * @return string The id attribute.
	 */
	protected function get_id() {
		if ( ! $this-&gt;id ) {
			/**
			 * Filter: 'wpseo_breadcrumb_output_id' - Allow changing the HTML ID on the Yoast SEO breadcrumbs wrapper element.
			 *
			 * @api string $unsigned ID to add to the wrapper element.
			 */
			$this-&gt;id = \apply_filters( 'wpseo_breadcrumb_output_id', '' );
			if ( ! \is_string( $this-&gt;id ) ) {
				return '';
			}

			if ( $this-&gt;id !== '' ) {
				$this-&gt;id = ' id=&quot;' . \esc_attr( $this-&gt;id ) . '&quot;';
			}
		}

		return $this-&gt;id;
	}

	/**
	 * Retrieves HTML Class attribute.
	 *
	 * @return string The class attribute.
	 */
	protected function get_class() {
		if ( ! $this-&gt;class ) {
			/**
			 * Filter: 'wpseo_breadcrumb_output_class' - Allow changing the HTML class on the Yoast SEO breadcrumbs wrapper element.
			 *
			 * @api string $unsigned Class to add to the wrapper element.
			 */
			$this-&gt;class = \apply_filters( 'wpseo_breadcrumb_output_class', '' );
			if ( ! \is_string( $this-&gt;class ) ) {
				return '';
			}

			if ( $this-&gt;class !== '' ) {
				$this-&gt;class = ' class=&quot;' . \esc_attr( $this-&gt;class ) . '&quot;';
			}
		}

		return $this-&gt;class;
	}

	/**
	 * Retrieves the wrapper element name.
	 *
	 * @return string The wrapper element name.
	 */
	protected function get_wrapper() {
		if ( ! $this-&gt;wrapper ) {
			$this-&gt;wrapper = \apply_filters( 'wpseo_breadcrumb_output_wrapper', 'span' );
			$this-&gt;wrapper = \tag_escape( $this-&gt;wrapper );
			if ( ! \is_string( $this-&gt;wrapper ) || $this-&gt;wrapper === '' ) {
				$this-&gt;wrapper = 'span';
			}
		}

		return $this-&gt;wrapper;
	}

	/**
	 * Retrieves the separator.
	 *
	 * @return string The separator.
	 */
	protected function get_separator() {
		if ( ! $this-&gt;separator ) {
			$this-&gt;separator = \apply_filters( 'wpseo_breadcrumb_separator', $this-&gt;helpers-&gt;options-&gt;get( 'breadcrumbs-sep' ) );
			$this-&gt;separator = ' ' . $this-&gt;separator . ' ';
		}

		return $this-&gt;separator;
	}

	/**
	 * Retrieves the crumb element name.
	 *
	 * @return string The element to use.
	 */
	protected function get_element() {
		if ( ! $this-&gt;element ) {
			$this-&gt;element = \esc_attr( \apply_filters( 'wpseo_breadcrumb_single_link_wrapper', 'span' ) );
		}

		return $this-&gt;element;
	}
}
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