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wp-content/plugins/polylang/frontend/choose-lang-content.php

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+<?php
+/**
+ * @package Polylang
+ */
+
+/**
+ * Choose the language when it is set from content
+ * The language is set either in parse_query with priority 2 or in wp with priority 5
+ *
+ * @since 1.2
+ */
+class PLL_Choose_Lang_Content extends PLL_Choose_Lang {
+
+	/**
+	 * Defers the language choice to the 'wp' action (when the content is known)
+	 *
+	 * @since 1.8
+	 *
+	 * @return void
+	 */
+	public function init() {
+		parent::init();
+
+		if ( ! did_action( 'pll_language_defined' ) ) {
+			// Set the languages from content
+			add_action( 'wp', array( $this, 'wp' ), 5 ); // Priority 5 for post types and taxonomies registered in wp hook with default priority
+
+			// If no language found, choose the preferred one
+			add_filter( 'pll_get_current_language', array( $this, 'pll_get_current_language' ) );
+		}
+	}
+
+	/**
+	 * Overwrites parent::set_language to remove the 'wp' action if the language is set before.
+	 *
+	 * @since 1.2
+	 *
+	 * @param PLL_Language $curlang Current language.
+	 * @return void
+	 */
+	protected function set_language( $curlang ) {
+		parent::set_language( $curlang );
+		remove_action( 'wp', array( $this, 'wp' ), 5 ); // won't attempt to set the language a 2nd time
+	}
+
+	/**
+	 * Returns the language based on the queried content
+	 *
+	 * @since 1.2
+	 *
+	 * @return object|bool detected language, false if none was found
+	 */
+	protected function get_language_from_content() {
+		// No language set for 404
+		if ( is_404() || ( is_attachment() && ! $this->options['media_support'] ) ) {
+			return $this->get_preferred_language();
+		}
+
+		if ( $var = get_query_var( 'lang' ) ) {
+			$lang = explode( ',', $var );
+			$lang = $this->model->get_language( reset( $lang ) ); // Choose the first queried language
+		}
+
+		elseif ( ( is_single() || is_page() || ( is_attachment() && $this->options['media_support'] ) ) && ( ( $var = get_queried_object_id() ) || ( $var = get_query_var( 'p' ) ) || ( $var = get_query_var( 'page_id' ) ) || ( $var = get_query_var( 'attachment_id' ) ) ) && is_numeric( $var ) ) {
+			$lang = $this->model->post->get_language( (int) $var );
+		}
+
+		else {
+			foreach ( $this->model->get_translated_taxonomies() as $taxonomy ) {
+				$tax_object = get_taxonomy( $taxonomy );
+
+				if ( empty( $tax_object ) ) {
+					continue;
+				}
+
+				$var = get_query_var( $tax_object->query_var );
+
+				if ( ! is_string( $var ) || empty( $var ) ) {
+					continue;
+				}
+
+				$term = get_term_by( 'slug', $var, $taxonomy );
+
+				if ( ! $term instanceof WP_Term ) {
+					continue;
+				}
+
+				$lang = $this->model->term->get_language( $term->term_id );
+			}
+		}
+
+		/**
+		 * Filters the language before it is set from the content.
+		 *
+		 * @since 0.9
+		 *
+		 * @param PLL_Language|false $lang Language object or false if none was found.
+		 */
+		return apply_filters( 'pll_get_current_language', isset( $lang ) ? $lang : false );
+	}
+
+	/**
+	 * Sets the language for the home page.
+	 * Adds the lang query var when querying archives with no language code.
+	 *
+	 * @since 1.2
+	 *
+	 * @param WP_Query $query Instance of WP_Query.
+	 * @return void
+	 */
+	public function parse_main_query( $query ) {
+		if ( empty( $GLOBALS['wp_the_query'] ) || $query !== $GLOBALS['wp_the_query'] ) {
+			return;
+		}
+
+		$qv = $query->query_vars;
+
+		// Homepage is requested, let's set the language
+		// Take care to avoid posts page for which is_home = 1
+		if ( empty( $query->query ) && ( is_home() || is_page() ) ) {
+			$this->home_language();
+			$this->home_requested();
+		}
+
+		parent::parse_main_query( $query );
+
+		$is_archive = ( count( $query->query ) == 1 && ! empty( $qv['paged'] ) ) ||
+			$query->is_date ||
+			$query->is_author ||
+			( ! empty( $qv['post_type'] ) && $query->is_post_type_archive && $this->model->is_translated_post_type( $qv['post_type'] ) );
+
+		// Sets the language in case we hide the default language
+		// Use $query->query['s'] as is_search is not set when search is empty
+		// http://wordpress.org/support/topic/search-for-empty-string-in-default-language
+		if ( $this->options['hide_default'] && ! isset( $qv['lang'] ) && ( $is_archive || isset( $query->query['s'] ) || ( count( $query->query ) == 1 && ! empty( $qv['feed'] ) ) ) ) {
+			$this->set_language( $this->model->get_default_language() );
+			$this->set_curlang_in_query( $query );
+		}
+	}
+
+	/**
+	 * Sets the language from content
+	 *
+	 * @since 1.2
+	 *
+	 * @return void
+	 */
+	public function wp() {
+		// Nothing to do if the language has already been set ( although normally the filter has been removed )
+		if ( empty( $this->curlang ) && $curlang = $this->get_language_from_content() ) {
+			parent::set_language( $curlang );
+		}
+	}
+
+	/**
+	 * If no language is found by {@see PLL_Choose_Lang_Content::get_language_from_content()}, returns the preferred one.
+	 *
+	 * @since 0.9
+	 *
+	 * @param PLL_Language|false $lang Language found by {@see PLL_Choose_Lang_Content::get_language_from_content()}.
+	 * @return PLL_Language
+	 */
+	public function pll_get_current_language( $lang ) {
+		return ! $lang ? $this->get_preferred_language() : $lang;
+	}
+}