dedupe getSubclassesOf

core/extension.php

@@ -304,9 +304,7 @@ abstract class ExtensionInfo
 
     public static function load_all_extension_info()
     {
-        foreach (get_declared_classes() as $class) {
-            $rclass = new ReflectionClass($class);
-            if (!$rclass->isAbstract() && is_subclass_of($class, "ExtensionInfo")) {
+        foreach (getSubclassesOf("ExtensionInfo") as $class) {
             $extension_info = new $class();
             if (array_key_exists($extension_info->key, self::$all_info_by_key)) {
                 throw new ScoreException("Extension Info $class with key $extension_info->key has already been loaded");
@@ -320,7 +318,6 @@ abstract class ExtensionInfo
         }
     }
 }
-}
 
 /**
  * Class FormatterExtension
@@ -462,4 +459,12 @@ abstract class DataHandlerExtension extends Extension
     abstract protected function check_contents(string $tmpname): bool;
     abstract protected function create_image_from_data(string $filename, array $metadata);
     abstract protected function create_thumb(string $hash, string $type): bool;
+
+    public static function get_all_supported_exts(): array {
+        $arr = [];
+        foreach(getSubclassesOf("DataHandlerExtension") as $handler) {
+            $arr = array_merge($arr, $handler->SUPPORTED_EXT);
+        }
+        return $arr;
+    }
 }

core/polyfills.php

@@ -341,6 +341,17 @@ function get_extension(?string $mime_type): ?string
     return ($ext ? $ext : null);
 }
 
+function getSubclassesOf(string $parent) {
+    $result = [];
+    foreach (get_declared_classes() as $class) {
+        $rclass = new ReflectionClass($class);
+        if (!$rclass->isAbstract() && is_subclass_of($class, $parent)) {
+            $result[] = $class;
+        }
+    }
+    return $result;
+}
+
 /**
  * Like glob, with support for matching very long patterns with braces.
  */

core/send_event.php

@@ -35,9 +35,7 @@ function _set_event_listeners(): void
     global $_shm_event_listeners;
     $_shm_event_listeners = [];
 
-    foreach (get_declared_classes() as $class) {
-        $rclass = new ReflectionClass($class);
-        if (!$rclass->isAbstract() && is_subclass_of($class, "Extension")) {
+    foreach (getSubclassesOf("Extension") as $class) {
         /** @var Extension $extension */
         $extension = new $class();
 
@@ -58,18 +56,14 @@ function _set_event_listeners(): void
         }
     }
 }
-}
 
 function _dump_event_listeners(array $event_listeners, string $path): void
 {
     $p = "<"."?php\n";
 
-    foreach (get_declared_classes() as $class) {
-        $rclass = new ReflectionClass($class);
-        if (!$rclass->isAbstract() && is_subclass_of($class, "Extension")) {
+    foreach (getSubclassesOf("Extension") as $class) {
         $p .= "\$$class = new $class(); ";
     }
-    }
 
     $p .= "\$_shm_event_listeners = array(\n";
     foreach ($event_listeners as $event => $listeners) {

ext/et/main.php

@@ -72,12 +72,9 @@ class ET extends Extension
         $info['stat_image_tags'] = $database->get_one("SELECT COUNT(*) FROM image_tags");
 
         $els = [];
-        foreach (get_declared_classes() as $class) {
-            $rclass = new ReflectionClass($class);
-            if (!$rclass->isAbstract() && is_subclass_of($class, "Extension")) {
+        foreach (getSubclassesOf("Extension") as $class) {
             $els[] = $class;
         }
-        }
         $info['sys_extensions'] = join(', ', $els);
 
         //$cfs = array();