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name : frontend.php
 <?php

/**
 * Frontend controller
 * accessible as $polylang global object
 *
 * Properties:
 * options        => inherited, reference to Polylang options array
 * model          => inherited, reference to PLL_Model object
 * links_model    => inherited, reference to PLL_Links_Model object
 * links          => reference to PLL_Links object
 * static_pages   => reference to PLL_Frontend_Static_Pages object
 * choose_lang    => reference to PLL_Choose_Lang object
 * curlang        => current language
 * filters        => reference to PLL_Frontend_Filters object
 * filters_links  => reference to PLL_Frontend_Filters_Links object
 * filters_search => reference to PLL_Frontend_Filters_Search object
 * posts          => reference to PLL_CRUD_Posts object
 * terms          => reference to PLL_CRUD_Terms object
 * nav_menu       => reference to PLL_Frontend_Nav_Menu object
 * sync           => reference to PLL_Sync object
 * auto_translate => optional, reference to PLL_Auto_Translate object
 *
 * @since 1.2
 */
class PLL_Frontend extends PLL_Base {
	public $curlang;
	public $links, $choose_lang, $filters, $filters_search, $nav_menu, $auto_translate;

	/**
	 * Constructor
	 *
	 * @since 1.2
	 *
	 * @param object $links_model
	 */
	public function __construct( &$links_model ) {
		parent::__construct( $links_model );

		add_action( 'pll_language_defined', array( $this, 'pll_language_defined' ), 1 );

		// Avoids the language being the queried object when querying multiple taxonomies
		add_action( 'parse_tax_query', array( $this, 'parse_tax_query' ), 1 );

		// Filters posts by language
		add_action( 'parse_query', array( $this, 'parse_query' ), 6 );

		// Not before 'check_canonical_url'
		if ( ! defined( 'PLL_AUTO_TRANSLATE' ) || PLL_AUTO_TRANSLATE ) {
			add_action( 'template_redirect', array( $this, 'auto_translate' ), 7 );
		}
	}

	/**
	 * Setups the language chooser based on options
	 *
	 * @since 1.2
	 */
	public function init() {
		parent::init();

		$this->links = new PLL_Frontend_Links( $this );

		// Static front page and page for posts
		if ( 'page' === get_option( 'show_on_front' ) ) {
			$this->static_pages = new PLL_Frontend_Static_Pages( $this );
		}

		// Setup the language chooser
		$c = array( 'Content', 'Url', 'Url', 'Domain' );
		$class = 'PLL_Choose_Lang_' . $c[ $this->options['force_lang'] ];
		$this->choose_lang = new $class( $this );
		$this->choose_lang->init();

		// Need to load nav menu class early to correctly define the locations in the customizer when the language is set from the content
		$this->nav_menu = new PLL_Frontend_Nav_Menu( $this );

		// Cross domain
		if ( PLL_COOKIE ) {
			$class = array( 2 => 'PLL_Xdata_Subdomain', 3 => 'PLL_Xdata_Domain' );
			if ( isset( $class[ $this->options['force_lang'] ] ) && class_exists( $class[ $this->options['force_lang'] ] ) ) {
				$this->xdata = new $class[ $this->options['force_lang'] ]( $this );
			}
		}

		if ( get_option( 'permalink_structure' ) ) {
			// Translate slugs
			if ( class_exists( 'PLL_Frontend_Translate_Slugs' ) ) {
				$slugs_model = new PLL_Translate_Slugs_Model( $this );
				$this->translate_slugs = new PLL_Frontend_Translate_Slugs( $slugs_model, $this->curlang );
			}

			// Share term slugs
			if ( $this->options['force_lang'] && class_exists( 'PLL_Share_Term_Slug' ) ) {
				$this->share_term_slug = version_compare( $GLOBALS['wp_version'], '4.8', '<' ) ?
					new PLL_Frontend_Share_Term_Slug( $this ) :
					new PLL_Share_Term_Slug( $this );
			}
		}
	}

	/**
	 * Setups filters and nav menus once the language has been defined
	 *
	 * @since 1.2
	 */
	public function pll_language_defined() {
		// Filters
		$this->filters_links = new PLL_Frontend_Filters_Links( $this );
		$this->filters = new PLL_Frontend_Filters( $this );
		$this->filters_search = new PLL_Frontend_Filters_Search( $this );
		$this->posts = new PLL_CRUD_Posts( $this );
		$this->terms = new PLL_CRUD_Terms( $this );

		$this->sync = new PLL_Sync( $this );

		// Auto translate for Ajax
		if ( ( ! defined( 'PLL_AUTO_TRANSLATE' ) || PLL_AUTO_TRANSLATE ) && wp_doing_ajax() ) {
			$this->auto_translate();
		}
	}

	/**
	 * When querying multiple taxonomies, makes sure that the language is not the queried object
	 *
	 * @since 1.8
	 *
	 * @param object $query WP_Query object
	 */
	public function parse_tax_query( $query ) {
		$pll_query = new PLL_Query( $query, $this->model );
		$queried_taxonomies = $pll_query->get_queried_taxonomies();

		if ( ! empty( $queried_taxonomies ) && 'language' == reset( $queried_taxonomies ) ) {
			$query->tax_query->queried_terms['language'] = array_shift( $query->tax_query->queried_terms );
		}
	}

	/**
	 * Modifies some query vars to "hide" that the language is a taxonomy and avoid conflicts
	 *
	 * @since 1.2
	 *
	 * @param object $query WP_Query object
	 */
	public function parse_query( $query ) {
		$qv = $query->query_vars;
		$pll_query = new PLL_Query( $query, $this->model );
		$taxonomies = $pll_query->get_queried_taxonomies();

		// Allow filtering recent posts and secondary queries by the current language
		if ( ! empty( $this->curlang ) ) {
			$pll_query->filter_query( $this->curlang );
		}

		// Modifies query vars when the language is queried
		if ( ! empty( $qv['lang'] ) || ( ! empty( $taxonomies ) && array( 'language' ) == array_values( $taxonomies ) ) ) {
			// Do we query a custom taxonomy?
			$taxonomies = array_diff( $taxonomies, array( 'language', 'category', 'post_tag' ) );

			// Remove pages query when the language is set unless we do a search
			// Take care not to break the single page, attachment and taxonomies queries!
			if ( empty( $qv['post_type'] ) && ! $query->is_search && ! $query->is_singular && empty( $taxonomies ) ) {
				$query->set( 'post_type', 'post' );
			}

			// Unset the is_archive flag for language pages to prevent loading the archive template
			// Keep archive flag for comment feed otherwise the language filter does not work
			if ( empty( $taxonomies ) && ! $query->is_comment_feed && ! $query->is_post_type_archive && ! $query->is_date && ! $query->is_author && ! $query->is_category && ! $query->is_tag ) {
				$query->is_archive = false;
			}

			// Unset the is_tax flag except if another custom tax is queried
			if ( empty( $taxonomies ) && ( $query->is_category || $query->is_tag || $query->is_author || $query->is_post_type_archive || $query->is_date || $query->is_search || $query->is_feed ) ) {
				$query->is_tax = false;
				unset( $query->queried_object ); // FIXME useless?
			}
		}
	}

	/**
	 * Auto translate posts and terms ids
	 *
	 * @since 1.2
	 */
	public function auto_translate() {
		$this->auto_translate = new PLL_Frontend_Auto_Translate( $this );
	}

	/**
	 * Resets some variables when switching blog
	 * Overrides parent method
	 *
	 * @since 1.5.1
	 *
	 * @param int $new_blog
	 * @param int $old_blog
	 */
	public function switch_blog( $new_blog, $old_blog ) {
		// Need to check that some languages are defined when user is logged in, has several blogs, some without any languages
		if ( parent::switch_blog( $new_blog, $old_blog ) && did_action( 'pll_language_defined' ) && $this->model->get_languages_list() ) {
			static $restore_curlang;
			if ( empty( $restore_curlang ) ) {
				$restore_curlang = $this->curlang->slug; // To always remember the current language through blogs
			}

			$lang = $this->model->get_language( $restore_curlang );
			$this->curlang = $lang ? $lang : $this->model->get_language( $this->options['default_lang'] );

			if ( isset( $this->static_pages ) ) {
				$this->static_pages->init();
			}

			$this->load_strings_translations();
		}
	}
}
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