ThemeInitialization::getActiveTheme

public ThemeInitialization::getActiveTheme(Extension $theme, array $base_themes = [])

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'] = array();

  // 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;

  $base_active_themes = array();
  foreach ($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);
}