/**
* {@inheritdoc}
*/
public function alter(&$cache, &$context1 = NULL, &$context2 = NULL)
{
// Sort the registry alphabetically (for easier debugging).
ksort($cache);
// Ensure paths to templates are set properly. This allows templates to
// be moved around in a theme without having to constantly ensuring that
// the theme's hook_theme() definitions have the correct static "path" set.
foreach ($this->currentTheme->getAncestry() as $ancestor) {
$current_theme = $ancestor->getName() === $this->currentTheme->getName();
$theme_path = $ancestor->getPath();
foreach ($ancestor->fileScan('/\\.html\\.twig$/', 'templates') as $file) {
$hook = str_replace('-', '_', str_replace('.html.twig', '', $file->filename));
$path = dirname($file->uri);
$incomplete = !isset($cache[$hook]) || strrpos($hook, '__');
if (!isset($cache[$hook])) {
$cache[$hook] = [];
}
$cache[$hook]['path'] = $path;
$cache[$hook]['type'] = $current_theme ? 'theme' : 'base_theme';
$cache[$hook]['theme path'] = $theme_path;
if ($incomplete) {
$cache[$hook]['incomplete preprocess functions'] = TRUE;
}
}
}
// Discover all the theme's preprocess plugins.
$preprocess_manager = new PreprocessManager($this->currentTheme);
$plugins = $preprocess_manager->getDefinitions();
ksort($plugins, SORT_NATURAL);
// Iterate over the preprocess plugins.
foreach ($plugins as $plugin_id => $definition) {
$incomplete = !isset($cache[$plugin_id]) || strrpos($plugin_id, '__');
if (!isset($cache[$plugin_id])) {
$cache[$plugin_id] = [];
}
array_walk($cache, function (&$info, $hook) use($plugin_id, $definition) {
if ($hook === $plugin_id || strpos($hook, $plugin_id . '__') === 0) {
if (!isset($info['preprocess functions'])) {
$info['preprocess functions'] = [];
}
// Due to a limitation in \Drupal\Core\Theme\ThemeManager::render,
// callbacks must be functions and not classes. We always specify
// "materialize_preprocess" here and then assign the plugin ID to a
// separate property that we can later intercept and properly invoke.
// @todo Revisit if/when preprocess callbacks can be any callable.
Materialize::addCallback($info['preprocess functions'], 'materialize_preprocess', $definition['replace'], $definition['action']);
$info['preprocess functions'] = array_unique($info['preprocess functions']);
$info['materialize preprocess'] = $plugin_id;
}
});
if ($incomplete) {
$cache[$plugin_id]['incomplete preprocess functions'] = TRUE;
}
}
// Allow core to post process.
$this->postProcessExtension($cache, $this->theme);
}
