--- /dev/null
+<?php
+
+namespace Drupal\Core\Theme;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\Extension;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Extension\ThemeHandlerInterface;
+
+/**
+ * Provides the theme initialization logic.
+ */
+class ThemeInitialization implements ThemeInitializationInterface {
+
+ /**
+ * The theme handler.
+ *
+ * @var \Drupal\Core\Extension\ThemeHandlerInterface
+ */
+ protected $themeHandler;
+
+ /**
+ * The cache backend to use for the active theme.
+ *
+ * @var \Drupal\Core\Cache\CacheBackendInterface
+ */
+ protected $cache;
+
+ /**
+ * The app root.
+ *
+ * @var string
+ */
+ protected $root;
+
+ /**
+ * The extensions that might be attaching assets.
+ *
+ * @var array
+ */
+ protected $extensions;
+
+ /**
+ * Constructs a new ThemeInitialization object.
+ *
+ * @param string $root
+ * The app root.
+ * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
+ * The theme handler.
+ * @param \Drupal\Core\Cache\CacheBackendInterface $cache
+ * The cache backend.
+ * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+ * The module handler to use to load modules.
+ */
+ public function __construct($root, ThemeHandlerInterface $theme_handler, CacheBackendInterface $cache, ModuleHandlerInterface $module_handler) {
+ $this->root = $root;
+ $this->themeHandler = $theme_handler;
+ $this->cache = $cache;
+ $this->moduleHandler = $module_handler;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function initTheme($theme_name) {
+ $active_theme = $this->getActiveThemeByName($theme_name);
+ $this->loadActiveTheme($active_theme);
+
+ return $active_theme;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getActiveThemeByName($theme_name) {
+ if ($cached = $this->cache->get('theme.active_theme.' . $theme_name)) {
+ return $cached->data;
+ }
+ $themes = $this->themeHandler->listInfo();
+
+ // If no theme could be negotiated, or if the negotiated theme is not within
+ // the list of installed themes, fall back to the default theme output of
+ // core and modules (like Stark, but without a theme extension at all). This
+ // is possible, because loadActiveTheme() always loads the Twig theme
+ // engine. This is desired, because missing or malformed theme configuration
+ // should not leave the application in a broken state. By falling back to
+ // default output, the user is able to reconfigure the theme through the UI.
+ // Lastly, tests are expected to operate with no theme by default, so as to
+ // only assert the original theme output of modules (unless a test manually
+ // installs a specific theme).
+ if (empty($themes) || !$theme_name || !isset($themes[$theme_name])) {
+ $theme_name = 'core';
+ // /core/core.info.yml does not actually exist, but is required because
+ // Extension expects a pathname.
+ $active_theme = $this->getActiveTheme(new Extension($this->root, 'theme', 'core/core.info.yml'));
+
+ // Early-return and do not set state, because the initialized $theme_name
+ // differs from the original $theme_name.
+ return $active_theme;
+ }
+
+ // Find all our ancestor themes and put them in an array.
+ $base_themes = [];
+ $ancestor = $theme_name;
+ while ($ancestor && isset($themes[$ancestor]->base_theme)) {
+ $ancestor = $themes[$ancestor]->base_theme;
+ if (!$this->themeHandler->themeExists($ancestor)) {
+ if ($ancestor == 'stable') {
+ // Themes that depend on Stable will be fixed by system_update_8014().
+ // There is no harm in not adding it as an ancestor since at worst
+ // some people might experience slight visual regressions on
+ // update.php.
+ continue;
+ }
+ throw new MissingThemeDependencyException(sprintf('Base theme %s has not been installed.', $ancestor), $ancestor);
+ }
+ $base_themes[] = $themes[$ancestor];
+ }
+
+ $active_theme = $this->getActiveTheme($themes[$theme_name], $base_themes);
+
+ $this->cache->set('theme.active_theme.' . $theme_name, $active_theme);
+ return $active_theme;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function loadActiveTheme(ActiveTheme $active_theme) {
+ // Initialize the theme.
+ if ($theme_engine = $active_theme->getEngine()) {
+ // Include the engine.
+ include_once $this->root . '/' . $active_theme->getOwner();
+
+ if (function_exists($theme_engine . '_init')) {
+ foreach ($active_theme->getBaseThemes() as $base) {
+ call_user_func($theme_engine . '_init', $base->getExtension());
+ }
+ call_user_func($theme_engine . '_init', $active_theme->getExtension());
+ }
+ }
+ else {
+ // include non-engine theme files
+ foreach ($active_theme->getBaseThemes() as $base) {
+ // Include the theme file or the engine.
+ if ($base->getOwner()) {
+ include_once $this->root . '/' . $base->getOwner();
+ }
+ }
+ // and our theme gets one too.
+ if ($active_theme->getOwner()) {
+ include_once $this->root . '/' . $active_theme->getOwner();
+ }
+ }
+
+ // Always include Twig as the default theme engine.
+ include_once $this->root . '/core/themes/engines/twig/twig.engine';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getActiveTheme(Extension $theme, array $base_themes = []) {
+ $theme_path = $theme->getPath();
+
+ $values['path'] = $theme_path;
+ $values['name'] = $theme->getName();
+
+ // @todo Remove in Drupal 9.0.x.
+ $values['stylesheets_remove'] = $this->prepareStylesheetsRemove($theme, $base_themes);
+
+ // Prepare libraries overrides from this theme and ancestor themes. This
+ // allows child themes to easily remove CSS files from base themes and
+ // modules.
+ $values['libraries_override'] = [];
+
+ // Get libraries overrides declared by base themes.
+ foreach ($base_themes as $base) {
+ if (!empty($base->info['libraries-override'])) {
+ foreach ($base->info['libraries-override'] as $library => $override) {
+ $values['libraries_override'][$base->getPath()][$library] = $override;
+ }
+ }
+ }
+
+ // Add libraries overrides declared by this theme.
+ if (!empty($theme->info['libraries-override'])) {
+ foreach ($theme->info['libraries-override'] as $library => $override) {
+ $values['libraries_override'][$theme->getPath()][$library] = $override;
+ }
+ }
+
+ // Get libraries extensions declared by base themes.
+ foreach ($base_themes as $base) {
+ if (!empty($base->info['libraries-extend'])) {
+ foreach ($base->info['libraries-extend'] as $library => $extend) {
+ if (isset($values['libraries_extend'][$library])) {
+ // Merge if libraries-extend has already been defined for this
+ // library.
+ $values['libraries_extend'][$library] = array_merge($values['libraries_extend'][$library], $extend);
+ }
+ else {
+ $values['libraries_extend'][$library] = $extend;
+ }
+ }
+ }
+ }
+ // Add libraries extensions declared by this theme.
+ if (!empty($theme->info['libraries-extend'])) {
+ foreach ($theme->info['libraries-extend'] as $library => $extend) {
+ if (isset($values['libraries_extend'][$library])) {
+ // Merge if libraries-extend has already been defined for this
+ // library.
+ $values['libraries_extend'][$library] = array_merge($values['libraries_extend'][$library], $extend);
+ }
+ else {
+ $values['libraries_extend'][$library] = $extend;
+ }
+ }
+ }
+
+ // Do basically the same as the above for libraries
+ $values['libraries'] = [];
+
+ // Grab libraries from base theme
+ foreach ($base_themes as $base) {
+ if (!empty($base->libraries)) {
+ foreach ($base->libraries as $library) {
+ $values['libraries'][] = $library;
+ }
+ }
+ }
+
+ // Add libraries used by this theme.
+ if (!empty($theme->libraries)) {
+ foreach ($theme->libraries as $library) {
+ $values['libraries'][] = $library;
+ }
+ }
+
+ $values['engine'] = isset($theme->engine) ? $theme->engine : NULL;
+ $values['owner'] = isset($theme->owner) ? $theme->owner : NULL;
+ $values['extension'] = $theme;
+
+ $base_active_themes = [];
+ foreach ($base_themes as $base_theme) {
+ $base_active_themes[$base_theme->getName()] = $this->getActiveTheme($base_theme, array_slice($base_themes, 1));
+ }
+
+ $values['base_themes'] = $base_active_themes;
+ if (!empty($theme->info['regions'])) {
+ $values['regions'] = $theme->info['regions'];
+ }
+
+ return new ActiveTheme($values);
+ }
+
+ /**
+ * Gets all extensions.
+ *
+ * @return array
+ */
+ protected function getExtensions() {
+ if (!isset($this->extensions)) {
+ $this->extensions = array_merge($this->moduleHandler->getModuleList(), $this->themeHandler->listInfo());
+ }
+ return $this->extensions;
+ }
+
+ /**
+ * Gets CSS file where tokens have been resolved.
+ *
+ * @param string $css_file
+ * CSS file which may contain tokens.
+ *
+ * @return string
+ * CSS file where placeholders are replaced.
+ *
+ * @todo Remove in Drupal 9.0.x.
+ */
+ protected function resolveStyleSheetPlaceholders($css_file) {
+ $token_candidate = explode('/', $css_file)[0];
+ if (!preg_match('/@[A-z0-9_-]+/', $token_candidate)) {
+ return $css_file;
+ }
+
+ $token = substr($token_candidate, 1);
+
+ // Prime extensions.
+ $extensions = $this->getExtensions();
+ if (isset($extensions[$token])) {
+ return str_replace($token_candidate, $extensions[$token]->getPath(), $css_file);
+ }
+ }
+
+ /**
+ * Prepares stylesheets-remove specified in the *.info.yml file.
+ *
+ * @param \Drupal\Core\Extension\Extension $theme
+ * The theme extension object.
+ * @param \Drupal\Core\Extension\Extension[] $base_themes
+ * An array of base themes.
+ *
+ * @return string[]
+ * The list of stylesheets-remove specified in the *.info.yml file.
+ *
+ * @todo Remove in Drupal 9.0.x.
+ */
+ protected function prepareStylesheetsRemove(Extension $theme, $base_themes) {
+ // Prepare stylesheets from this theme as well as all ancestor themes.
+ // We work it this way so that we can have child themes remove CSS files
+ // easily from parent.
+ $stylesheets_remove = [];
+ // Grab stylesheets from base theme.
+ foreach ($base_themes as $base) {
+ if (!empty($base->info['stylesheets-remove'])) {
+ foreach ($base->info['stylesheets-remove'] as $css_file) {
+ $css_file = $this->resolveStyleSheetPlaceholders($css_file);
+ $stylesheets_remove[$css_file] = $css_file;
+ }
+ }
+ }
+
+ // Add stylesheets used by this theme.
+ if (!empty($theme->info['stylesheets-remove'])) {
+ foreach ($theme->info['stylesheets-remove'] as $css_file) {
+ $css_file = $this->resolveStyleSheetPlaceholders($css_file);
+ $stylesheets_remove[$css_file] = $css_file;
+ }
+ }
+ return $stylesheets_remove;
+ }
+
+}
projects / yaffs-website / blobdiff