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293 lines
11 KiB
293 lines
11 KiB
<?php
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/**
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* @package Polylang
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*/
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/**
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* A class to display a language switcher on frontend
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*
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* @since 1.2
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*/
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class PLL_Switcher {
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const DEFAULTS = array(
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'dropdown' => 0, // Display as list and not as dropdown.
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'echo' => 1, // Echoes the list.
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'hide_if_empty' => 1, // Hides languages with no posts (or pages).
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'show_flags' => 0, // Don't show flags.
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'show_names' => 1, // Show language names.
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'display_names_as' => 'name', // Display the language name.
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'force_home' => 0, // Tries to find a translation.
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'hide_if_no_translation' => 0, // Don't hide the link if there is no translation.
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'hide_current' => 0, // Don't hide the current language.
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'post_id' => null, // Link to the translations of the current page.
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'raw' => 0, // Build the language switcher.
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'item_spacing' => 'preserve', // Preserve whitespace between list items.
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'admin_render' => 0, // Make the switcher in a frontend context.
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'admin_current_lang' => null, // Use the global current language.
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);
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/**
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* @var PLL_Links|null
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*/
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protected $links;
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/**
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* Returns options available for the language switcher - menu or widget
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* either strings to display the options or default values
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*
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* @since 0.7
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*
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* @param string $type optional either 'menu', 'widget' or 'block', defaults to 'widget'
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* @param string $key optional either 'string' or 'default', defaults to 'string'
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* @return array list of switcher options strings or default values
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*/
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public static function get_switcher_options( $type = 'widget', $key = 'string' ) {
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$options = array(
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'dropdown' => array( 'string' => __( 'Displays as a dropdown', 'polylang' ), 'default' => 0 ),
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'show_names' => array( 'string' => __( 'Displays language names', 'polylang' ), 'default' => 1 ),
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'show_flags' => array( 'string' => __( 'Displays flags', 'polylang' ), 'default' => 0 ),
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'force_home' => array( 'string' => __( 'Forces link to front page', 'polylang' ), 'default' => 0 ),
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'hide_current' => array( 'string' => __( 'Hides the current language', 'polylang' ), 'default' => 0 ),
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'hide_if_no_translation' => array( 'string' => __( 'Hides languages with no translation', 'polylang' ), 'default' => 0 ),
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);
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return wp_list_pluck( $options, $key );
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}
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/**
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* Returns the current language code.
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*
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* @since 3.0
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*
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* @param array $args Arguments passed to {@see PLL_Switcher::the_languages()}.
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* @return string
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*/
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protected function get_current_language( $args ) {
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if ( $args['admin_current_lang'] ) {
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return $args['admin_current_lang'];
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}
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if ( isset( $this->links->curlang ) ) {
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return $this->links->curlang->slug;
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}
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return $this->links->options['default_lang'];
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}
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/**
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* Returns the link for a given language.
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*
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* @since 3.0
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*
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* @param PLL_Language $language Language.
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* @param array $args Arguments passed to {@see PLL_Switcher::the_languages()}.
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* @return string|null
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*/
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protected function get_link( $language, $args ) {
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global $post;
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// Priority to the post passed in parameters.
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if ( null !== $args['post_id'] ) {
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$tr_id = $this->links->model->post->get( $args['post_id'], $language );
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if ( $tr_id && $this->links->model->post->current_user_can_read( $tr_id ) ) {
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return get_permalink( $tr_id );
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}
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}
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// If we are on frontend.
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if ( $this->links instanceof PLL_Frontend_Links ) {
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return $this->links->get_translation_url( $language );
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}
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// For blocks in posts in REST requests.
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if ( $post instanceof WP_Post ) {
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$tr_id = $this->links->model->post->get( $post->ID, $language );
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if ( $tr_id && $this->links->model->post->current_user_can_read( $tr_id ) ) {
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return get_permalink( $tr_id );
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}
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}
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return null;
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}
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/**
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* Get the language elements for use in a walker
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*
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* @since 1.2
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*
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* @param array $args Arguments passed to {@see PLL_Switcher::the_languages()}.
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* @return array Language switcher elements.
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*/
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protected function get_elements( $args ) {
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$first = true;
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$out = array();
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foreach ( $this->links->model->get_languages_list( array( 'hide_empty' => $args['hide_if_empty'] ) ) as $language ) {
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$id = (int) $language->term_id;
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$order = (int) $language->term_group;
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$slug = $language->slug;
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$locale = $language->get_locale( 'display' );
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$item_classes = array( 'lang-item', 'lang-item-' . $id, 'lang-item-' . esc_attr( $slug ) );
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$classes = isset( $args['classes'] ) && is_array( $args['classes'] ) ?
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array_merge(
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$item_classes,
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$args['classes']
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) :
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$item_classes;
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$link_classes = isset( $args['link_classes'] ) ? $args['link_classes'] : array();
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$current_lang = $this->get_current_language( $args ) === $slug;
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if ( $current_lang ) {
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if ( $args['hide_current'] && ! ( $args['dropdown'] && ! $args['raw'] ) ) {
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continue; // Hide current language except for dropdown
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} else {
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$classes[] = 'current-lang';
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}
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}
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$url = $this->get_link( $language, $args );
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if ( $no_translation = empty( $url ) ) {
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$classes[] = 'no-translation';
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}
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/**
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* Filter the link in the language switcher
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*
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* @since 0.7
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*
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* @param string|null $url The link, null if no translation was found.
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* @param string $slug The language code.
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* @param string $locale The language locale
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*/
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$url = apply_filters( 'pll_the_language_link', $url, $slug, $language->locale );
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// Hide if no translation exists
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if ( empty( $url ) && $args['hide_if_no_translation'] ) {
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continue;
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}
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$url = empty( $url ) || $args['force_home'] ? $this->links->get_home_url( $language ) : $url; // If the page is not translated, link to the home page
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$name = $args['show_names'] || ! $args['show_flags'] || $args['raw'] ? ( 'slug' == $args['display_names_as'] ? $slug : $language->name ) : '';
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if ( $args['raw'] && ! $args['show_flags'] ) {
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$flag = $language->get_display_flag_url();
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} elseif ( $args['show_flags'] ) {
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$flag = $language->get_display_flag( empty( $args['show_names'] ) ? 'alt' : 'no-alt' );
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} else {
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$flag = '';
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}
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if ( $first ) {
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$classes[] = 'lang-item-first';
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$first = false;
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}
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$out[ $slug ] = compact( 'id', 'order', 'slug', 'locale', 'name', 'url', 'flag', 'current_lang', 'no_translation', 'classes', 'link_classes' );
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}
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return $out;
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}
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/**
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* Displays a language switcher
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* or returns the raw elements to build a custom language switcher.
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*
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* @since 0.1
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*
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* @param PLL_Links $links Instance of PLL_Links.
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* @param array $args {
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* Optional array of arguments.
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*
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* @type int $dropdown The list is displayed as dropdown if set, defaults to 0.
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* @type int $echo Echoes the list if set to 1, defaults to 1.
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* @type int $hide_if_empty Hides languages with no posts ( or pages ) if set to 1, defaults to 1.
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* @type int $show_flags Displays flags if set to 1, defaults to 0.
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* @type int $show_names Shows language names if set to 1, defaults to 1.
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* @type string $display_names_as Whether to display the language name or its slug, valid options are 'slug' and 'name', defaults to name.
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* @type int $force_home Will always link to home in translated language if set to 1, defaults to 0.
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* @type int $hide_if_no_translation Hides the link if there is no translation if set to 1, defaults to 0.
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* @type int $hide_current Hides the current language if set to 1, defaults to 0.
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* @type int $post_id Returns links to the translations of the post defined by post_id if set, defaults not set.
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* @type int $raw Return a raw array instead of html markup if set to 1, defaults to 0.
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* @type string $item_spacing Whether to preserve or discard whitespace between list items, valid options are 'preserve' and 'discard', defaults to 'preserve'.
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* @type int $admin_render Allows to force the current language code in an admin context if set, default to 0. Need to set the admin_current_lang argument below.
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* @type string $admin_current_lang The current language code in an admin context. Need to set the admin_render to 1, defaults not set.
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* @type string[] $classes A list of CSS classes to set to each elements outputted.
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* @type string[] $link_classes A list of CSS classes to set to each link outputted.
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* }
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* @return string|array either the html markup of the switcher or the raw elements to build a custom language switcher
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*/
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public function the_languages( $links, $args = array() ) {
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$this->links = $links;
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$args = wp_parse_args( $args, self::DEFAULTS );
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/**
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* Filter the arguments of the 'pll_the_languages' template tag
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*
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* @since 1.5
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*
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* @param array $args
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*/
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$args = apply_filters( 'pll_the_languages_args', $args );
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// Force not to hide the language for the widget preview even if the option is checked.
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if ( $this->links instanceof PLL_Admin_Links ) {
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$args['hide_if_no_translation'] = 0;
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}
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// Prevents showing empty options in `<select>`.
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if ( $args['dropdown'] && ! $args['raw'] ) {
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$args['show_names'] = 1;
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}
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$elements = $this->get_elements( $args );
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if ( $args['raw'] ) {
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return $elements;
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}
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if ( $args['dropdown'] ) {
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$args['name'] = 'lang_choice_' . $args['dropdown'];
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$args['class'] = 'pll-switcher-select';
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$args['value'] = 'url';
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$args['selected'] = $this->get_link( $this->links->model->get_language( $this->get_current_language( $args ) ), $args );
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$walker = new PLL_Walker_Dropdown();
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} else {
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$walker = new PLL_Walker_List();
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}
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// Cast each element to stdClass because $walker::walk() expects an array of objects.
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foreach ( $elements as $i => $element ) {
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$elements[ $i ] = (object) $element;
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}
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/**
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* Filter the whole html markup returned by the 'pll_the_languages' template tag
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*
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* @since 0.8
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*
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* @param string $html html returned/outputted by the template tag
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* @param array $args arguments passed to the template tag
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*/
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$out = apply_filters( 'pll_the_languages', $walker->walk( $elements, -1, $args ), $args );
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// Javascript to switch the language when using a dropdown list.
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if ( $args['dropdown'] && 0 === $args['admin_render'] ) {
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// Accept only few valid characters for the urls_x variable name (as the widget id includes '-' which is invalid).
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$out .= sprintf(
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'<script%1$s>
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document.getElementById( "%2$s" ).addEventListener( "change", function ( event ) { location.href = event.currentTarget.value; } )
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</script>',
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current_theme_supports( 'html5', 'script' ) ? '' : ' type="text/javascript"',
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esc_js( $args['name'] )
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);
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}
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if ( $args['echo'] ) {
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echo $out; // phpcs:ignore WordPress.Security.EscapeOutput
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}
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return $out;
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}
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}
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