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vendor/codeception/base/src/Codeception/Subscriber/AutoRebuild.php

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+<?php
+namespace Codeception\Subscriber;
+
+use Codeception\Configuration;
+use Codeception\Event\SuiteEvent;
+use Codeception\Events;
+use Codeception\Lib\Generator\Actions;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+class AutoRebuild implements EventSubscriberInterface
+{
+    use Shared\StaticEvents;
+
+    public static $events = [
+        Events::SUITE_INIT => 'updateActor'
+    ];
+
+    public function updateActor(SuiteEvent $e)
+    {
+        $settings = $e->getSettings();
+        if (!$settings['actor']) {
+            codecept_debug('actor is empty');
+            return; // no actor
+        }
+
+        $modules = $e->getSuite()->getModules();
+
+        $actorActionsFile = Configuration::supportDir() . '_generated' . DIRECTORY_SEPARATOR
+            . $settings['actor'] . 'Actions.php';
+
+        if (!file_exists($actorActionsFile)) {
+            codecept_debug("Generating {$settings['actor']}Actions...");
+            $this->generateActorActions($actorActionsFile, $settings);
+            return;
+        }
+        
+        // load actor class to see hash
+        $handle = @fopen($actorActionsFile, "r");
+        if ($handle and is_writable($actorActionsFile)) {
+            $line = @fgets($handle);
+            if (preg_match('~\[STAMP\] ([a-f0-9]*)~', $line, $matches)) {
+                $hash = $matches[1];
+                $currentHash = Actions::genHash($modules, $settings);
+
+                // regenerate actor class when hashes do not match
+                if ($hash != $currentHash) {
+                    codecept_debug("Rebuilding {$settings['actor']}...");
+                    @fclose($handle);
+                    $this->generateActorActions($actorActionsFile, $settings);
+                    return;
+                }
+            }
+            @fclose($handle);
+        }
+    }
+
+    protected function generateActorActions($actorActionsFile, $settings)
+    {
+        if (!file_exists(Configuration::supportDir() . '_generated')) {
+            @mkdir(Configuration::supportDir() . '_generated');
+        }
+        $actionsGenerator = new Actions($settings);
+        $generated = $actionsGenerator->produce();
+        @file_put_contents($actorActionsFile, $generated);
+    }
+}