MDL-65646 core: Move component storage to json

lib/adminlib.php

@@ -132,17 +132,26 @@ function uninstall_plugin($type, $name) {
     $subplugintypes = core_component::get_plugin_types_with_subplugins();
     if (isset($subplugintypes[$type])) {
         $base = core_component::get_plugin_directory($type, $name);
-        if (file_exists("$base/db/subplugins.php")) {
-            $subplugins = array();
-            include("$base/db/subplugins.php");
-            foreach ($subplugins as $subplugintype=>$dir) {
+
+        $subpluginsfile = "{$base}/db/subplugins.json";
+        if (file_exists($subpluginsfile)) {
+            $subplugins = (array) json_decode(file_get_contents($subpluginsfile))->plugintypes;
+        } else if (file_exists("{$base}/db/subplugins.php")) {
+            debugging('Use of subplugins.php has been deprecated. ' .
+                    'Please update your plugin to provide a subplugins.json file instead.',
+                    DEBUG_DEVELOPER);
+            $subplugins = [];
+            include("{$base}/db/subplugins.php");
+        }
+
+        if (!empty($subplugins)) {
+            foreach (array_keys($subplugins) as $subplugintype) {
                 $instances = core_component::get_plugin_list($subplugintype);
                 foreach ($instances as $subpluginname => $notusedpluginpath) {
                     uninstall_plugin($subplugintype, $subpluginname);
                 }
             }
         }
-
     }
 
     $component = $type . '_' . $name;  // eg. 'qtype_multichoice' or 'workshopgrading_accumulative' or 'mod_forum'