<?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\Conditionals\Greek_Support_Conditional;

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use Yoast\WP\SEO\Conditionals\Japanese_Support_Conditional;

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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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*/

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class Language_Helper {

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/**

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* Represents the Japanese support conditional.

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*

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* @var Japanese_Support_Conditional

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*/

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protected $japanese_conditional;

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/**

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* Represents the Greek support conditional.

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*

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* @var Greek_Support_Conditional

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*/

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protected $greek_conditional;

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/**

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* Language_Helper constructor.

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*

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* @param Japanese_Support_Conditional $japanese_conditional The Japanese support conditional.

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* @param Greek_Support_Conditional $greek_conditional The Greek support conditional.

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*/

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public function __construct( Japanese_Support_Conditional $japanese_conditional, Greek_Support_Conditional $greek_conditional ) {

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$this->japanese_conditional = $japanese_conditional;

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$this->greek_conditional = $greek_conditional;

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}

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/**

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

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*

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* @param string $language The used language.

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*

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

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*/

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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', 'fa' ];

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// If JAPANESE_SUPPORT feature is enabled, push Japanese to the array of the supported languages.

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if ( $this->japanese_conditional->is_met() ) {

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\array_push( $supported_languages, 'ja' );

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}

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// If GREEK_SUPPORT feature is enabled, push Greek to the array of the supported languages.

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if ( $this->greek_conditional->is_met() ) {

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\array_push( $supported_languages, 'el' );

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}

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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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*

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* @param string $language The language to check.

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*

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

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*/

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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' ];

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// If JAPANESE_SUPPORT feature is enabled, push Japanese to the array of the supported languages.

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if ( $this->japanese_conditional->is_met() ) {

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\array_push( $supported_languages, 'ja' );

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}

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// If GREEK_SUPPORT feature is enabled, push Greek to the array of the supported languages.

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if ( $this->greek_conditional->is_met() ) {

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\array_push( $supported_languages, 'el' );

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}

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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 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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*

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

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*/

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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 JAPANESE_SUPPORT feature is enabled, push Japanese to the array of the supported languages.

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if ( $this->japanese_conditional->is_met() ) {

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\array_push( $supported_languages, 'ja' );

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}

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// If GREEK_SUPPORT feature is enabled, push Greek to the array of the supported languages.

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if ( $this->greek_conditional->is_met() ) {

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\array_push( $supported_languages, 'el' );

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}

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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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