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Editing: class-wpseo-rank.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Internals
 */

/**
 * Holder for SEO Rank information.
 */
class WPSEO_Rank {

/**
	 * Constant used for determining a bad SEO rating.
	 *
	 * @var string
	 */
	const BAD = 'bad';

/**
	 * Constant used for determining an OK SEO rating.
	 *
	 * @var string
	 */
	const OK = 'ok';

/**
	 * Constant used for determining a good SEO rating.
	 *
	 * @var string
	 */
	const GOOD = 'good';

/**
	 * Constant used for determining that no focus keyphrase is set.
	 *
	 * @var string
	 */
	const NO_FOCUS = 'na';

/**
	 * Constant used for determining that this content is not indexed.
	 *
	 * @var string
	 */
	const NO_INDEX = 'noindex';

/**
	 * All possible ranks.
	 *
	 * @var array
	 */
	protected static $ranks = [
		self::BAD,
		self::OK,
		self::GOOD,
		self::NO_FOCUS,
		self::NO_INDEX,
	];

/**
	 * Holds the translation from seo score slug to actual score range.
	 *
	 * @var array
	 */
	protected static $ranges = [
		self::NO_FOCUS => [
			'start' => 0,
			'end'   => 0,
		],
		self::BAD => [
			'start' => 1,
			'end'   => 40,
		],
		self::OK => [
			'start' => 41,
			'end'   => 70,
		],
		self::GOOD => [
			'start' => 71,
			'end'   => 100,
		],
	];

/**
	 * The current rank.
	 *
	 * @var int
	 */
	protected $rank;

/**
	 * WPSEO_Rank constructor.
	 *
	 * @param int $rank The actual rank.
	 */
	public function __construct( $rank ) {
		if ( ! in_array( $rank, self::$ranks, true ) ) {
			$rank = self::BAD;
		}

$this->rank = $rank;
	}

/**
	 * Returns the saved rank for this rank.
	 *
	 * @return string
	 */
	public function get_rank() {
		return $this->rank;
	}

/**
	 * Returns a CSS class for this rank.
	 *
	 * @return string
	 */
	public function get_css_class() {
		$labels = [
			self::NO_FOCUS => 'na',
			self::NO_INDEX => 'noindex',
			self::BAD      => 'bad',
			self::OK       => 'ok',
			self::GOOD     => 'good',
		];

return $labels[ $this->rank ];
	}

/**
	 * Returns a label for this rank.
	 *
	 * @return string
	 */
	public function get_label() {
		$labels = [
			self::NO_FOCUS => __( 'Not available', 'wordpress-seo' ),
			self::NO_INDEX => __( 'No index', 'wordpress-seo' ),
			self::BAD      => __( 'Needs improvement', 'wordpress-seo' ),
			self::OK       => __( 'OK', 'wordpress-seo' ),
			self::GOOD     => __( 'Good', 'wordpress-seo' ),
		];

return $labels[ $this->rank ];
	}

/**
	 * Returns a label for use in a drop down.
	 *
	 * @return mixed
	 */
	public function get_drop_down_label() {
		$labels = [
			self::NO_FOCUS => sprintf(
				/* translators: %s expands to the SEO score */
				__( 'SEO: %s', 'wordpress-seo' ),
				__( 'No Focus Keyphrase', 'wordpress-seo' )
			),
			self::BAD => sprintf(
				/* translators: %s expands to the SEO score */
				__( 'SEO: %s', 'wordpress-seo' ),
				__( 'Needs improvement', 'wordpress-seo' )
			),
			self::OK => sprintf(
				/* translators: %s expands to the SEO score */
				__( 'SEO: %s', 'wordpress-seo' ),
				__( 'OK', 'wordpress-seo' )
			),
			self::GOOD => sprintf(
				/* translators: %s expands to the SEO score */
				__( 'SEO: %s', 'wordpress-seo' ),
				__( 'Good', 'wordpress-seo' )
			),
			self::NO_INDEX => sprintf(
				/* translators: %s expands to the SEO score */
				__( 'SEO: %s', 'wordpress-seo' ),
				__( 'Post Noindexed', 'wordpress-seo' )
			),
		];

return $labels[ $this->rank ];
	}

/**
	 * Gets the drop down labels for the readability score.
	 *
	 * @return string The readability rank label.
	 */
	public function get_drop_down_readability_labels() {
		$labels = [
			self::BAD => sprintf(
				/* translators: %s expands to the readability score */
				__( 'Readability: %s', 'wordpress-seo' ),
				__( 'Needs improvement', 'wordpress-seo' )
			),
			self::OK => sprintf(
				/* translators: %s expands to the readability score */
				__( 'Readability: %s', 'wordpress-seo' ),
				__( 'OK', 'wordpress-seo' )
			),
			self::GOOD => sprintf(
				/* translators: %s expands to the readability score */
				__( 'Readability: %s', 'wordpress-seo' ),
				__( 'Good', 'wordpress-seo' )
			),
		];

return $labels[ $this->rank ];
	}

/**
	 * Get the starting score for this rank.
	 *
	 * @return int The start score.
	 */
	public function get_starting_score() {
		// No index does not have a starting score.
		if ( self::NO_INDEX === $this->rank ) {
			return -1;
		}

return self::$ranges[ $this->rank ]['start'];
	}

/**
	 * Get the ending score for this rank.
	 *
	 * @return int The end score.
	 */
	public function get_end_score() {
		// No index does not have an end score.
		if ( self::NO_INDEX === $this->rank ) {
			return -1;
		}

return self::$ranges[ $this->rank ]['end'];
	}

/**
	 * Returns a rank for a specific numeric score.
	 *
	 * @param int $score The score to determine a rank for.
	 *
	 * @return self
	 */
	public static function from_numeric_score( $score ) {
		// Set up the default value.
		$rank = new self( self::BAD );

foreach ( self::$ranges as $rank_index => $range ) {
			if ( $range['start'] <= $score && $score <= $range['end'] ) {
				$rank = new self( $rank_index );
				break;
			}
		}

return $rank;
	}

/**
	 * Returns a list of all possible SEO Ranks.
	 *
	 * @return WPSEO_Rank[]
	 */
	public static function get_all_ranks() {
		return array_map( [ 'WPSEO_Rank', 'create_rank' ], self::$ranks );
	}

/**
	 * Returns a list of all possible Readability Ranks.
	 *
	 * @return WPSEO_Rank[]
	 */
	public static function get_all_readability_ranks() {
		return array_map( [ 'WPSEO_Rank', 'create_rank' ], [ self::BAD, self::OK, self::GOOD ] );
	}

/**
	 * Converts a numeric rank into a WPSEO_Rank object, for use in functional array_* functions.
	 *
	 * @param string $rank SEO Rank.
	 *
	 * @return WPSEO_Rank
	 */
	private static function create_rank( $rank ) {
		return new self( $rank );
	}
}

Editing: class-wpseo-rank.php

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