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<?php |
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|
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/** |
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* base class to choose the language |
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* |
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* @since 1.2 |
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*/ |
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abstract class PLL_Choose_Lang { |
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public $links_model, $model, $options; |
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public $curlang; |
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|
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/** |
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* constructor |
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* |
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* @since 1.2 |
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* |
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* @param object $polylang |
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*/ |
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public function __construct( &$polylang ) { |
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$this->links_model = &$polylang->links_model; |
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$this->model = &$polylang->model; |
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$this->options = &$polylang->options; |
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|
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$this->curlang = &$polylang->curlang; |
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} |
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|
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/** |
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* sets the language for ajax requests |
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* and setup actions |
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* any child class must call this method if it overrides it |
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* |
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* @since 1.8 |
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*/ |
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public function init() { |
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if ( PLL_AJAX_ON_FRONT || false === stripos( $_SERVER['SCRIPT_FILENAME'], 'index.php' ) ) { |
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$this->set_language( empty( $_REQUEST['lang'] ) ? $this->get_preferred_language() : $this->model->get_language( $_REQUEST['lang'] ) ); |
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} |
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|
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add_action( 'pre_comment_on_post', array( $this, 'pre_comment_on_post' ) ); // sets the language of comment |
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add_action( 'parse_query', array( $this, 'parse_main_query' ), 2 ); // sets the language in special cases |
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} |
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|
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/** |
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* writes language cookie |
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* loads user defined translations |
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* fires the action 'pll_language_defined' |
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* |
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* @since 1.2 |
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* |
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* @param object $curlang current language |
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*/ |
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protected function set_language( $curlang ) { |
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// don't set the language a second time |
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if ( isset( $this->curlang ) ) { |
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return; |
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} |
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|
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// final check in case $curlang has an unexpected value |
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// see https://wordpress.org/support/topic/detect-browser-language-sometimes-setting-null-language |
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$this->curlang = ( $curlang instanceof PLL_Language ) ? $curlang : $this->model->get_language( $this->options['default_lang'] ); |
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|
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$this->maybe_setcookie(); |
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|
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$GLOBALS['text_direction'] = $this->curlang->is_rtl ? 'rtl' : 'ltr'; |
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|
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/** |
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* Fires when the current language is defined |
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* |
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* @since 0.9.5 |
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* |
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* @param string $slug current language code |
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* @param object $curlang current language object |
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*/ |
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do_action( 'pll_language_defined', $this->curlang->slug, $this->curlang ); |
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} |
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|
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/** |
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* set a cookie to remember the language. |
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* possibility to set PLL_COOKIE to false will disable cookie although it will break some functionalities |
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* |
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* @since 1.5 |
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*/ |
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protected function maybe_setcookie() { |
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// check headers have not been sent to avoid ugly error |
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// cookie domain must be set to false for localhost ( default value for COOKIE_DOMAIN ) thanks to Stephen Harris. |
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if ( ! headers_sent() && PLL_COOKIE !== false && ( ! isset( $_COOKIE[ PLL_COOKIE ] ) || $_COOKIE[ PLL_COOKIE ] != $this->curlang->slug ) ) { |
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|
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/** |
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* Filter the Polylang cookie duration |
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* |
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* @since 1.8 |
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* |
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* @param int $duration cookie duration in seconds |
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*/ |
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$expiration = apply_filters( 'pll_cookie_expiration', YEAR_IN_SECONDS ); |
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|
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setcookie( |
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PLL_COOKIE, |
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$this->curlang->slug, |
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time() + $expiration, |
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COOKIEPATH, |
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2 == $this->options['force_lang'] ? parse_url( $this->links_model->home, PHP_URL_HOST ) : COOKIE_DOMAIN |
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); |
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} |
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} |
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|
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/** |
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* get the preferred language according to the browser preferences |
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* code adapted from http://www.thefutureoftheweb.com/blog/use-accept-language-header |
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* |
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* @since 1.8 |
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* |
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* @return string|bool the preferred language slug or false |
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*/ |
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public function get_preferred_browser_language() { |
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$accept_langs = array(); |
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|
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if ( isset( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) { |
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// break up string into pieces ( languages and q factors ) |
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preg_match_all( '/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*( 1|0\.[0-9]+))?/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse ); |
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|
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$k = $lang_parse[1]; |
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$v = $lang_parse[4]; |
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|
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if ( $n = count( $k ) ) { |
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// set default to 1 for any without q factor |
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foreach ( $v as $key => $val ) { |
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if ( '' === $val ) { |
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$v[ $key ] = 1; |
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} |
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} |
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|
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// bubble sort ( need a stable sort for Android, so can't use a PHP sort function ) |
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if ( $n > 1 ) { |
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for ( $i = 2; $i <= $n; $i++ ) { |
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for ( $j = 0; $j <= $n - 2; $j++ ) { |
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if ( $v[ $j ] < $v[ $j + 1 ] ) { |
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// swap values |
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$temp = $v[ $j ]; |
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$v[ $j ] = $v[ $j + 1 ]; |
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$v[ $j + 1 ] = $temp; |
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//swap keys |
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$temp = $k[ $j ]; |
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$k[ $j ] = $k[ $j + 1 ]; |
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$k[ $j + 1 ] = $temp; |
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} |
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} |
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} |
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} |
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$accept_langs = array_combine( $k,$v ); |
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} |
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} |
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|
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$languages = $this->model->get_languages_list( array( 'hide_empty' => true ) ); // hides languages with no post |
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|
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/** |
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* Filter the list of languages to use to match the browser preferences |
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* |
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* @since 1.9.3 |
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* |
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* @param array $languages array of PLL_Language objects |
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*/ |
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$languages = apply_filters( 'pll_languages_for_browser_preferences', $languages ); |
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|
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// looks through sorted list and use first one that matches our language list |
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foreach ( array_keys( $accept_langs ) as $accept_lang ) { |
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// first loop to match the exact locale |
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foreach ( $languages as $language ) { |
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if ( 0 === strcasecmp( $accept_lang, $language->get_locale( 'display' ) ) ) { |
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return $language->slug; |
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} |
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} |
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|
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// second loop to match the language set |
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foreach ( $languages as $language ) { |
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if ( 0 === stripos( $accept_lang, $language->slug ) || 0 === stripos( $language->get_locale( 'display' ), $accept_lang ) ) { |
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return $language->slug; |
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} |
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} |
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} |
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return false; |
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} |
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|
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/** |
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* returns the language according to browser preference or the default language |
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* |
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* @since 0.1 |
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* |
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* @return object browser preferred language or default language |
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*/ |
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public function get_preferred_language() { |
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// check first if the user was already browsing this site |
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if ( isset( $_COOKIE[ PLL_COOKIE ] ) ) { |
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return $this->model->get_language( $_COOKIE[ PLL_COOKIE ] ); |
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} |
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|
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/** |
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* Filter the visitor's preferred language (normally set first by cookie |
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* if this is not the first visit, then by the browser preferences). |
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* If no preferred language has been found or set by this filter, |
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* Polylang fallbacks to the default language |
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* |
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* @since 1.0 |
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* |
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* @param string $language preferred language code |
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*/ |
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$slug = apply_filters( 'pll_preferred_language', $this->options['browser'] ? $this->get_preferred_browser_language() : false ); |
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|
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// return default if there is no preferences in the browser or preferences does not match our languages or it is requested not to use the browser preference |
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return ( $lang = $this->model->get_language( $slug ) ) ? $lang : $this->model->get_language( $this->options['default_lang'] ); |
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} |
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|
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/** |
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* sets the language when home page is resquested |
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* |
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* @since 1.2 |
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*/ |
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protected function home_language() { |
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// test referer in case PLL_COOKIE is set to false |
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// thanks to Ov3rfly http://wordpress.org/support/topic/enhance-feature-when-front-page-is-visited-set-language-according-to-browser |
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$language = $this->options['hide_default'] && ( ( isset( $_SERVER['HTTP_REFERER'] ) && in_array( parse_url( $_SERVER['HTTP_REFERER'], PHP_URL_HOST ), $this->links_model->get_hosts() ) ) || ! $this->options['browser'] ) ? |
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$this->model->get_language( $this->options['default_lang'] ) : |
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$this->get_preferred_language(); // sets the language according to browser preference or default language |
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$this->set_language( $language ); |
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} |
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|
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/** |
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* to call when the home page has been requested |
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* make sure to call this after 'setup_theme' has been fired as we need $wp_query |
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* performs a redirection to the home page in the current language if needed |
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* |
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* @since 0.9 |
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*/ |
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public function home_requested() { |
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// we are already on the right page |
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if ( $this->options['default_lang'] == $this->curlang->slug && $this->options['hide_default'] ) { |
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$this->set_lang_query_var( $GLOBALS['wp_query'], $this->curlang ); |
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|
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/** |
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* Fires when the site root page is requested |
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* |
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* @since 1.8 |
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*/ |
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do_action( 'pll_home_requested' ); |
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} |
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// redirect to the home page in the right language |
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// test to avoid crash if get_home_url returns something wrong |
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// FIXME why this happens? http://wordpress.org/support/topic/polylang-crashes-1 |
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// don't redirect if $_POST is not empty as it could break other plugins |
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// don't forget the query string which may be added by plugins |
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elseif ( is_string( $redirect = $this->curlang->home_url ) && empty( $_POST ) ) { |
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$redirect = empty( $_SERVER['QUERY_STRING'] ) ? $redirect : $redirect . ( $this->links_model->using_permalinks ? '?' : '&' ) . $_SERVER['QUERY_STRING']; |
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|
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/** |
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* When a visitor reaches the site home, Polylang redirects to the home page in the correct language. |
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* This filter allows plugins to modify the redirected url or prevent this redirection |
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* |
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* @since 1.1.1 |
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* |
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* @param string $redirect the url the visitor will be redirected to |
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*/ |
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if ( $redirect = apply_filters( 'pll_redirect_home', $redirect ) ) { |
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wp_redirect( $redirect ); |
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exit; |
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} |
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} |
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} |
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|
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/** |
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* set the language when posting a comment |
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* |
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* @since 0.8.4 |
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* |
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* @param int $post_id the post beeing commented |
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*/ |
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public function pre_comment_on_post( $post_id ) { |
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$this->set_language( $this->model->post->get_language( $post_id ) ); |
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} |
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|
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/** |
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* modifies some main query vars for home page and page for posts |
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* to enable one home page ( and one page for posts ) per language |
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* |
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* @since 1.2 |
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* |
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* @param object $query instance of WP_Query |
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*/ |
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public function parse_main_query( $query ) { |
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if ( ! $query->is_main_query() ) { |
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return; |
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} |
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|
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/** |
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* This filter allows to set the language based on information contained in the main query |
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* |
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* @since 1.8 |
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* |
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* @param bool|object $lang false or language object |
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* @param object $query WP_Query object |
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*/ |
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if ( $lang = apply_filters( 'pll_set_language_from_query', false, $query ) ) { |
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$this->set_language( $lang ); |
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$this->set_lang_query_var( $query, $this->curlang ); |
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} |
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|
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// sets is_home on translated home page when it displays posts |
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// is_home must be true on page 2, 3... too |
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// as well as when searching an empty string: http://wordpress.org/support/topic/plugin-polylang-polylang-breaks-search-in-spun-theme |
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if ( 'posts' == get_option( 'show_on_front' ) && ( count( $query->query ) == 1 || ( is_paged() && count( $query->query ) == 2 ) || ( isset( $query->query['s'] ) && ! $query->query['s'] ) ) && $lang = get_query_var( 'lang' ) ) { |
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$lang = $this->model->get_language( $lang ); |
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$this->set_language( $lang ); // sets the language now otherwise it will be too late to filter sticky posts ! |
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$query->is_home = true; |
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$query->is_archive = $query->is_tax = false; |
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} |
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} |
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|
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/** |
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* sets the language in query |
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* optimized for ( needs ) WP 3.5+ |
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* |
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* @since 1.3 |
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*/ |
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public function set_lang_query_var( &$query, $lang ) { |
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// defining directly the tax_query ( rather than setting 'lang' avoids transforming the query by WP ) |
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$query->query_vars['tax_query'][] = array( |
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'taxonomy' => 'language', |
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'field' => 'term_taxonomy_id', // since WP 3.5 |
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'terms' => $lang->term_taxonomy_id, |
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'operator' => 'IN', |
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); |
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} |
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} |
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|
