protected function Registry::processExtension in Drupal 9
Same name and namespace in other branches
- 8 core/lib/Drupal/Core/Theme/Registry.php \Drupal\Core\Theme\Registry::processExtension()
- 10 core/lib/Drupal/Core/Theme/Registry.php \Drupal\Core\Theme\Registry::processExtension()
Process a single implementation of hook_theme().
Parameters
array $cache: The theme registry that will eventually be cached; It is an associative array keyed by theme hooks, whose values are associative arrays describing the hook:
- 'type': The passed-in $type.
- 'theme path': The passed-in $path.
- 'function': The name of the function generating output for this theme hook. Either defined explicitly in hook_theme() or, if neither 'function' nor 'template' is defined, then the default theme function name is used. The default theme function name is the theme hook prefixed by either 'theme_' for modules or '$name_' for everything else. If 'function' is defined, 'template' is not used.
- 'template': The filename of the template generating output for this theme hook. The template is in the directory defined by the 'path' key of hook_theme() or defaults to "$path/templates".
- 'variables': The variables for this theme hook as defined in hook_theme(). If there is more than one implementation and 'variables' is not specified in a later one, then the previous definition is kept.
- 'render element': The renderable element for this theme hook as defined in hook_theme(). If there is more than one implementation and 'render element' is not specified in a later one, then the previous definition is kept.
- See the Theme system overview topic for detailed documentation.
string $name: The name of the module, theme engine, base theme engine, theme or base theme implementing hook_theme().
string $type: One of 'module', 'theme_engine', 'base_theme_engine', 'theme', or 'base_theme'. Unlike regular hooks that can only be implemented by modules, each of these can implement hook_theme(). This function is called in aforementioned order and new entries override older ones. For example, if a theme hook is both defined by a module and a theme, then the definition in the theme will be used.
string $theme: The actual name of theme, module, etc. that is being processed.
string $path: The directory where $name is. For example, modules/system or themes/bartik.
Throws
\BadFunctionCallException
See also
\Drupal\Core\Theme\ThemeManagerInterface::render()
\Drupal\Core\Extension\ThemeHandler::listInfo()
1 call to Registry::processExtension()
- Registry::build in core/
lib/ Drupal/ Core/ Theme/ Registry.php - Builds the theme registry cache.
File
- core/
lib/ Drupal/ Core/ Theme/ Registry.php, line 453
Class
- Registry
- Defines the theme registry service.
Namespace
Drupal\Core\ThemeCode
protected function processExtension(array &$cache, $name, $type, $theme, $path) {
$result = [];
$hook_defaults = [
'variables' => TRUE,
'render element' => TRUE,
'pattern' => TRUE,
'base hook' => TRUE,
];
$module_list = array_keys($this->moduleHandler
->getModuleList());
// Invoke the hook_theme() implementation, preprocess what is returned, and
// merge it into $cache.
$function = $name . '_theme';
if (function_exists($function)) {
$result = $function($cache, $type, $theme, $path);
foreach ($result as $hook => $info) {
// When a theme or engine overrides a module's theme function
// $result[$hook] will only contain key/value pairs for information being
// overridden. Pull the rest of the information from what was defined by
// an earlier hook.
// Fill in the type and path of the module, theme, or engine that
// implements this theme function.
$result[$hook]['type'] = $type;
$result[$hook]['theme path'] = $path;
// If a theme hook has a base hook, mark its preprocess functions always
// incomplete in order to inherit the base hook's preprocess functions.
if (!empty($result[$hook]['base hook'])) {
$result[$hook]['incomplete preprocess functions'] = TRUE;
}
if (isset($cache[$hook]['includes'])) {
$result[$hook]['includes'] = $cache[$hook]['includes'];
}
// Load the includes, as they may contain preprocess functions.
if (isset($info['includes'])) {
foreach ($info['includes'] as $include_file) {
include_once $this->root . '/' . $include_file;
}
}
// If the theme implementation defines a file, then also use the path
// that it defined. Otherwise use the default path. This allows
// system.module to declare theme functions on behalf of core .include
// files.
if (isset($info['file'])) {
$include_file = isset($info['path']) ? $info['path'] : $path;
$include_file .= '/' . $info['file'];
include_once $this->root . '/' . $include_file;
$result[$hook]['includes'][] = $include_file;
}
// A template file is the default implementation for a theme hook, but
// if the theme hook specifies a function callback instead, check to
// ensure the function actually exists.
if (isset($info['function'])) {
trigger_error(sprintf('Theme functions are deprecated in drupal:8.0.0 and are removed from drupal:10.0.0. Use Twig templates instead of %s(). See https://www.drupal.org/node/1831138', $info['function']), E_USER_DEPRECATED);
if (!function_exists($info['function'])) {
throw new \BadFunctionCallException(sprintf('Theme hook "%s" refers to a theme function callback that does not exist: "%s"', $hook, $info['function']));
}
}
elseif (!isset($info['template'])) {
$info['template'] = strtr($hook, '_', '-');
$result[$hook]['template'] = $info['template'];
}
// Prepend the current theming path when none is set. This is required
// for the default theme engine to know where the template lives.
if (isset($result[$hook]['template']) && !isset($info['path'])) {
$result[$hook]['path'] = $path . '/templates';
}
// If the default keys are not set, use the default values registered
// by the module.
if (isset($cache[$hook])) {
$result[$hook] += array_intersect_key($cache[$hook], $hook_defaults);
}
// Preprocess variables for all theming hooks, whether the hook is
// implemented as a template or as a function. Ensure they are arrays.
if (!isset($info['preprocess functions']) || !is_array($info['preprocess functions'])) {
$info['preprocess functions'] = [];
$prefixes = [];
if ($type == 'module') {
// Default variable preprocessor prefix.
$prefixes[] = 'template';
// Add all modules so they can intervene with their own variable
// preprocessors. This allows them to provide variable preprocessors
// even if they are not the owner of the current hook.
$prefixes = array_merge($prefixes, $module_list);
}
elseif ($type == 'theme_engine' || $type == 'base_theme_engine') {
// Theme engines get an extra set that come before the normally
// named variable preprocessors.
$prefixes[] = $name . '_engine';
// The theme engine registers on behalf of the theme using the
// theme's name.
$prefixes[] = $theme;
}
else {
// This applies when the theme manually registers their own variable
// preprocessors.
$prefixes[] = $name;
}
foreach ($prefixes as $prefix) {
// Only use non-hook-specific variable preprocessors for theming
// hooks implemented as templates. See the @defgroup themeable
// topic.
if (isset($info['template']) && function_exists($prefix . '_preprocess')) {
$info['preprocess functions'][] = $prefix . '_preprocess';
}
if (function_exists($prefix . '_preprocess_' . $hook)) {
$info['preprocess functions'][] = $prefix . '_preprocess_' . $hook;
}
}
}
// Check for the override flag and prevent the cached variable
// preprocessors from being used. This allows themes or theme engines
// to remove variable preprocessors set earlier in the registry build.
if (!empty($info['override preprocess functions'])) {
// Flag not needed inside the registry.
unset($result[$hook]['override preprocess functions']);
}
elseif (isset($cache[$hook]['preprocess functions']) && is_array($cache[$hook]['preprocess functions'])) {
$info['preprocess functions'] = array_merge($cache[$hook]['preprocess functions'], $info['preprocess functions']);
}
$result[$hook]['preprocess functions'] = $info['preprocess functions'];
// If a theme implementation definition provides both 'template' and
// 'function', the 'function' will be used. In this case, if the new
// result provides a 'template' value, any existing 'function' value
// must be removed for the override to be called.
if (isset($result[$hook]['template'])) {
unset($cache[$hook]['function']);
}
}
// Merge the newly created theme hooks into the existing cache.
$cache = NestedArray::mergeDeep($cache, $result);
}
// Let themes have variable preprocessors even if they didn't register a
// template.
if ($type == 'theme' || $type == 'base_theme') {
foreach ($cache as $hook => $info) {
// Check only if not registered by the theme or engine.
if (empty($result[$hook])) {
if (!isset($info['preprocess functions'])) {
$cache[$hook]['preprocess functions'] = [];
}
// Only use non-hook-specific variable preprocessors for theme hooks
// implemented as templates. See the @defgroup themeable topic.
if (isset($info['template']) && function_exists($name . '_preprocess')) {
$cache[$hook]['preprocess functions'][] = $name . '_preprocess';
}
if (function_exists($name . '_preprocess_' . $hook)) {
$cache[$hook]['preprocess functions'][] = $name . '_preprocess_' . $hook;
$cache[$hook]['theme path'] = $path;
}
}
}
}
}