Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Path;
Chris@0: 
Chris@0: use Drupal\Core\Config\ConfigFactoryInterface;
Chris@0: use Drupal\Core\Routing\RouteMatchInterface;
Chris@0: use Drupal\Core\Url;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a path matcher.
Chris@0:  */
Chris@0: class PathMatcher implements PathMatcherInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * Whether the current page is the front page.
Chris@0:    *
Chris@0:    * @var bool
Chris@0:    */
Chris@0:   protected $isCurrentFrontPage;
Chris@0: 
Chris@0:   /**
Chris@0:    * The default front page.
Chris@0:    *
Chris@0:    * @var string
Chris@0:    */
Chris@0:   protected $frontPage;
Chris@0: 
Chris@0:   /**
Chris@0:    * The cache of regular expressions.
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $regexes;
Chris@0: 
Chris@0:   /**
Chris@0:    * The config factory service.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Config\ConfigFactoryInterface
Chris@0:    */
Chris@0:   protected $configFactory;
Chris@0: 
Chris@0:   /**
Chris@0:    * The current route match.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Routing\RouteMatchInterface
Chris@0:    */
Chris@0:   protected $routeMatch;
Chris@0: 
Chris@0:   /**
Chris@0:    * Creates a new PathMatcher.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
Chris@0:    *   The config factory.
Chris@0:    * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
Chris@0:    *   The current route match.
Chris@0:    */
Chris@0:   public function __construct(ConfigFactoryInterface $config_factory, RouteMatchInterface $route_match) {
Chris@0:     $this->configFactory = $config_factory;
Chris@0:     $this->routeMatch = $route_match;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function matchPath($path, $patterns) {
Chris@0: 
Chris@0:     if (!isset($this->regexes[$patterns])) {
Chris@0:       // Convert path settings to a regular expression.
Chris@0:       $to_replace = [
Chris@0:         // Replace newlines with a logical 'or'.
Chris@0:         '/(\r\n?|\n)/',
Chris@0:         // Quote asterisks.
Chris@0:         '/\\\\\*/',
Chris@0:         // Quote <front> keyword.
Chris@0:         '/(^|\|)\\\\<front\\\\>($|\|)/',
Chris@0:       ];
Chris@0:       $replacements = [
Chris@0:         '|',
Chris@0:         '.*',
Chris@0:         '\1' . preg_quote($this->getFrontPagePath(), '/') . '\2',
Chris@0:       ];
Chris@0:       $patterns_quoted = preg_quote($patterns, '/');
Chris@0:       $this->regexes[$patterns] = '/^(' . preg_replace($to_replace, $replacements, $patterns_quoted) . ')$/';
Chris@0:     }
Chris@0:     return (bool) preg_match($this->regexes[$patterns], $path);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function isFrontPage() {
Chris@0:     // Cache the result as this is called often.
Chris@0:     if (!isset($this->isCurrentFrontPage)) {
Chris@0:       $this->isCurrentFrontPage = FALSE;
Chris@0:       // Ensure that the code can also be executed when there is no active
Chris@0:       // route match, like on exception responses.
Chris@0:       if ($this->routeMatch->getRouteName()) {
Chris@0:         $url = Url::fromRouteMatch($this->routeMatch);
Chris@0:         $this->isCurrentFrontPage = ($url->getRouteName() && '/' . $url->getInternalPath() === $this->getFrontPagePath());
Chris@0:       }
Chris@0:     }
Chris@0:     return $this->isCurrentFrontPage;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Gets the current front page path.
Chris@0:    *
Chris@0:    * @return string
Chris@0:    *   The front page path.
Chris@0:    */
Chris@0:   protected function getFrontPagePath() {
Chris@0:     // Lazy-load front page config.
Chris@0:     if (!isset($this->frontPage)) {
Chris@0:       $this->frontPage = $this->configFactory->get('system.site')
Chris@0:         ->get('page.front');
Chris@0:     }
Chris@0:     return $this->frontPage;
Chris@0:   }
Chris@0: 
Chris@0: }