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<?php

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namespace Yoast\WP\SEO\Helpers;

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use WPSEO_Language_Utils;

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use Yoast\WP\SEO\Config\Researcher_Languages;

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/**

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* A helper object for language features.

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class Language_Helper {

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/**

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* The languages with inclusive language analysis support.

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* @var string[]

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public static $languages_with_inclusive_language_support = [ 'en' ];

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/**

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* Checks whether word form recognition is active for the used language.

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* @param string $language The used language.

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* @return bool Whether word form recognition is active for the used language.

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public function is_word_form_recognition_active( $language ) {

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$supported_languages = [ 'de', 'en', 'es', 'fr', 'it', 'nl', 'ru', 'id', 'pt', 'pl', 'ar', 'sv', 'he', 'hu', 'nb', 'tr', 'cs', 'sk', 'el', 'ja' ];

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return \in_array( $language, $supported_languages, true );

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}

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/**

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* Checks whether the given language has function word support.

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* (E.g. function words are used or filtered out for this language when doing some SEO and readability assessments).

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* @param string $language The language to check.

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* @return bool Whether the language has function word support.

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public function has_function_word_support( $language ) {

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$supported_languages = [ 'en', 'de', 'nl', 'fr', 'es', 'it', 'pt', 'ru', 'pl', 'sv', 'id', 'he', 'ar', 'hu', 'nb', 'tr', 'cs', 'sk', 'fa', 'el', 'ja' ];

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return \in_array( $language, $supported_languages, true );

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}

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/**

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* Checks whether the given language has inclusive language support.

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* @param string $language The language to check if inclusive language is supported.

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* @return bool Whether the language has inclusive language support.

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public function has_inclusive_language_support( $language ) {

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return \in_array( $language, self::$languages_with_inclusive_language_support, true );

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}

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/**

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* Checks whether we have a specific researcher for the current locale and returns that language.

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* If there is no researcher for the current locale, returns default as the researcher.

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* @return string The language to use to select a researcher.

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public function get_researcher_language() {

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$researcher_language = WPSEO_Language_Utils::get_language( \get_locale() );

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$supported_languages = Researcher_Languages::SUPPORTED_LANGUAGES;

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if ( ! \in_array( $researcher_language, $supported_languages, true ) ) {

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$researcher_language = 'default';

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}

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return $researcher_language;

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}

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/**

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* Returns The site language code without region

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* (e.g. 'en' for 'en_US' or 'en_GB').

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* @return string The site language code without region.

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public function get_language() {

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return WPSEO_Language_Utils::get_language( \get_locale() );

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}

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}

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