annotate core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrlFallback.php @ 19:fa3358dc1485 tip

Add ndrum files
author Chris Cannam
date Wed, 28 Aug 2019 13:14:47 +0100
parents 4c8ae668cc8c
children
rev   line source
Chris@0 1 <?php
Chris@0 2
Chris@0 3 namespace Drupal\language\Plugin\LanguageNegotiation;
Chris@0 4
Chris@0 5 use Drupal\language\LanguageNegotiationMethodBase;
Chris@0 6 use Symfony\Component\HttpFoundation\Request;
Chris@0 7
Chris@0 8 /**
Chris@0 9 * Class that determines the language to be assigned to URLs when none is
Chris@0 10 * detected.
Chris@0 11 *
Chris@0 12 * The language negotiation process has a fallback chain that ends with the
Chris@0 13 * default language negotiation method. Each built-in language type has a
Chris@0 14 * separate initialization:
Chris@0 15 * - Interface language, which is the only configurable one, always gets a valid
Chris@0 16 * value. If no request-specific language is detected, the default language
Chris@0 17 * will be used.
Chris@0 18 * - Content language merely inherits the interface language by default.
Chris@0 19 * - URL language is detected from the requested URL and will be used to rewrite
Chris@0 20 * URLs appearing in the page being rendered. If no language can be detected,
Chris@0 21 * there are two possibilities:
Chris@0 22 * - If the default language has no configured path prefix or domain, then the
Chris@0 23 * default language is used. This guarantees that (missing) URL prefixes are
Chris@0 24 * preserved when navigating through the site.
Chris@0 25 * - If the default language has a configured path prefix or domain, a
Chris@0 26 * requested URL having an empty prefix or domain is an anomaly that must be
Chris@0 27 * fixed. This is done by introducing a prefix or domain in the rendered
Chris@0 28 * page matching the detected interface language.
Chris@0 29 *
Chris@0 30 * @LanguageNegotiation(
Chris@0 31 * id = Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrlFallback::METHOD_ID,
Chris@0 32 * types = {Drupal\Core\Language\LanguageInterface::TYPE_URL},
Chris@0 33 * weight = 8,
Chris@0 34 * name = @Translation("URL fallback"),
Chris@0 35 * description = @Translation("Use an already detected language for URLs if none is found.")
Chris@0 36 * )
Chris@0 37 */
Chris@0 38 class LanguageNegotiationUrlFallback extends LanguageNegotiationMethodBase {
Chris@0 39
Chris@0 40 /**
Chris@0 41 * The language negotiation method id.
Chris@0 42 */
Chris@0 43 const METHOD_ID = 'language-url-fallback';
Chris@0 44
Chris@0 45 /**
Chris@0 46 * {@inheritdoc}
Chris@0 47 */
Chris@0 48 public function getLangcode(Request $request = NULL) {
Chris@0 49 $langcode = NULL;
Chris@0 50
Chris@0 51 if ($this->languageManager) {
Chris@0 52 $default = $this->languageManager->getDefaultLanguage();
Chris@0 53 $config = $this->config->get('language.negotiation')->get('url');
Chris@0 54 $prefix = ($config['source'] == LanguageNegotiationUrl::CONFIG_PATH_PREFIX);
Chris@0 55
Chris@0 56 // If the default language is not configured to convey language
Chris@0 57 // information, a missing URL language information indicates that URL
Chris@0 58 // language should be the default one, otherwise we fall back to an
Chris@0 59 // already detected language.
Chris@0 60 if (($prefix && empty($config['prefixes'][$default->getId()])) || (!$prefix && empty($config['domains'][$default->getId()]))) {
Chris@0 61 $langcode = $default->getId();
Chris@0 62 }
Chris@0 63 else {
Chris@0 64 $langcode = $this->languageManager->getCurrentLanguage()->getId();
Chris@0 65 }
Chris@0 66 }
Chris@0 67
Chris@0 68 return $langcode;
Chris@0 69 }
Chris@0 70
Chris@0 71 }