Remove unnecessary special case handling

app/Engine/Engine.php

@@ -27,12 +27,8 @@ class Engine
 	{
 		$file_helper = new File([dirname(realpath($input_file))]);
 
-		$input_document = $this->unserialize->unserialize(file_get_contents($file_helper->resolve($input_file)));
-
-		$files = $input_document->getMeta('stack');
 		$files[] = $input_file;
-
-		$processed = [$input_file];
+		$processed = [];
 
 		for ($i = 0; $i < sizeof($files); $i++)
 		{
@@ -56,16 +52,7 @@ class Engine
 				}
 			}
 			echo '=> '.$files[$i].PHP_EOL;
-			if ($i == 0)
-			{
-				// Initial document load
-				$this->setInputDocument($document);
-			}
-			else
-			{
-				// Transform
-				$this->compileDocument($document, $options);
-			}
+			$this->compileDocument($document, $options);
 		}
 
 		return $this->getOutput();