function drupal_find_theme_templates in Drupal 8

Same name and namespace in other branches

1. 6 includes/theme.inc \drupal_find_theme_templates()
2. 7 includes/theme.inc \drupal_find_theme_templates()
3. 9 core/includes/theme.inc \drupal_find_theme_templates()

Allows themes and/or theme engines to easily discover overridden templates.

Parameters

$cache: The existing cache of theme hooks to test against.

$extension: The extension that these templates will have.

$path: The path to search.

4 calls to drupal_find_theme_templates()

nyan_cat_theme in core/modules/system/tests/themes/engines/nyan_cat/nyan_cat.engine

Implements hook_theme().

ThemeTest::testFindThemeTemplates in core/modules/system/tests/src/Kernel/Theme/ThemeTest.php

Tests drupal_find_theme_templates().

TwigDebugMarkupTest::testTwigDebugMarkup in core/modules/system/tests/src/Functional/Theme/TwigDebugMarkupTest.php

Tests debug markup added to Twig template output.

twig_theme in core/themes/engines/twig/twig.engine

Implements hook_theme().

File

core/includes/theme.inc, line 194

The theme system, which controls the output of Drupal.

Code

function drupal_find_theme_templates($cache, $extension, $path) {
  $implementations = [];

  // Collect paths to all sub-themes grouped by base themes. These will be
  // used for filtering. This allows base themes to have sub-themes in its
  // folder hierarchy without affecting the base themes template discovery.
  $theme_paths = [];
  foreach (\Drupal::service('theme_handler')
    ->listInfo() as $theme_info) {
    if (!empty($theme_info->base_theme)) {
      $theme_paths[$theme_info->base_theme][$theme_info
        ->getName()] = $theme_info
        ->getPath();
    }
  }
  foreach ($theme_paths as $basetheme => $subthemes) {
    foreach ($subthemes as $subtheme => $subtheme_path) {
      if (isset($theme_paths[$subtheme])) {
        $theme_paths[$basetheme] = array_merge($theme_paths[$basetheme], $theme_paths[$subtheme]);
      }
    }
  }
  $theme = \Drupal::theme()
    ->getActiveTheme()
    ->getName();
  $subtheme_paths = isset($theme_paths[$theme]) ? $theme_paths[$theme] : [];

  // Escape the periods in the extension.
  $regex = '/' . str_replace('.', '\\.', $extension) . '$/';

  // Get a listing of all template files in the path to search.
  $files = [];
  if (is_dir($path)) {
    $files = \Drupal::service('file_system')
      ->scanDirectory($path, $regex, [
      'key' => 'filename',
    ]);
  }

  // Find templates that implement registered theme hooks and include that in
  // what is returned so that the registry knows that the theme has this
  // implementation.
  foreach ($files as $template => $file) {

    // Ignore sub-theme templates for the current theme.
    if (strpos($file->uri, str_replace($subtheme_paths, '', $file->uri)) !== 0) {
      continue;
    }

    // Remove the extension from the filename.
    $template = str_replace($extension, '', $template);

    // Transform - in filenames to _ to match function naming scheme
    // for the purposes of searching.
    $hook = strtr($template, '-', '_');
    if (isset($cache[$hook])) {
      $implementations[$hook] = [
        'template' => $template,
        'path' => dirname($file->uri),
      ];
    }

    // Match templates based on the 'template' filename.
    foreach ($cache as $hook => $info) {
      if (isset($info['template'])) {
        if ($template === $info['template']) {
          $implementations[$hook] = [
            'template' => $template,
            'path' => dirname($file->uri),
          ];
        }
      }
    }
  }

  // Find templates that implement possible "suggestion" variants of registered
  // theme hooks and add those as new registered theme hooks. See
  // drupal_find_theme_functions() for more information about suggestions and
  // the use of 'pattern' and 'base hook'.
  $patterns = array_keys($files);
  foreach ($cache as $hook => $info) {
    $pattern = isset($info['pattern']) ? $info['pattern'] : $hook . '__';
    if (!isset($info['base hook']) && !empty($pattern)) {

      // Transform _ in pattern to - to match file naming scheme
      // for the purposes of searching.
      $pattern = strtr($pattern, '_', '-');
      $matches = preg_grep('/^' . $pattern . '/', $patterns);
      if ($matches) {
        foreach ($matches as $match) {
          $file = $match;

          // Remove the extension from the filename.
          $file = str_replace($extension, '', $file);

          // Put the underscores back in for the hook name and register this
          // pattern.
          $arg_name = isset($info['variables']) ? 'variables' : 'render element';
          $implementations[strtr($file, '-', '_')] = [
            'template' => $file,
            'path' => dirname($files[$match]->uri),
            $arg_name => $info[$arg_name],
            'base hook' => $hook,
          ];
        }
      }
    }
  }
  return $implementations;
}