Allow using LayoutExtractor for to extract layout

Extractor/LayoutExtractorInterface.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Theodo\RogerCmsBundle\Extractor;
+
+/**
+ * Implement this interface to extract layout string from a template.
+ * This can be useful if you have other Twig extensions that parse layouts.
+ *
+ * @author Marek Kalnik <[email protected]>
+ */
+interface LayoutExtractorInterface
+{
+    /**
+     * Function extracting the layout from template.
+     * If no layout found this should return a empty string.
+     *
+     * @param string $template
+     *
+     * @return string
+     */
+    public function getLayout($template);
+}

Form/DataTransformer/LayoutExtractor.php

@@ -5,13 +5,14 @@
 use Symfony\Component\Form\DataTransformerInterface;
 use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Theodo\RogerCmsBundle\Extractor\LayoutExtractorInterface;
 
 /**
  * This DataTransformer splits page content on template and proper content
  *
  * @autor Marek Kalnik <[email protected]>
  */
-class LayoutExtractor implements DataTransformerInterface
+class LayoutExtractor implements DataTransformerInterface, LayoutExtractorInterface
 {
     /**
      * Receives page content and splits it
@@ -83,6 +84,22 @@ public function reverseTransform($array)
         return $pageContent;
     }
 
+    /**
+     * Extracts layout from given twig template
+     *
+     * @param string $template
+     */
+    public function getLayout($template)
+    {
+        if ($layout = trim($this->matchLayoutName($template), '"')) {
+            return 'layout:' . $layout;
+        }
+
+        $layout = trim($this->matchTemplateName($template), '"');
+
+        return $layout;
+    }
+
     /**
      * @param String $pageContent Content to find layout name in.
      *

Tests/Form/DataTransformer/LayoutExtractorTest.php

@@ -52,4 +52,22 @@ public function getContentData()
             )
         );
     }
+
+    /**
+     *
+     */
+    public function testExtractsLayout()
+    {
+        $extractor = new LayoutExtractor();
+
+        $data = <<<TWIG
+{% extends 'layout:normal' %}Test text
+TWIG;
+        $this->assertEquals('layout:normal', $extractor->getLayout($data));
+
+        $data = <<<TWIG2
+{% extends 'AcmeDemoBundle:Default:index.html.twig' %}Test text
+TWIG2;
+        $this->assertEquals('AcmeDemoBundle:Default:index.html.twig', $extractor->getLayout($data));
+    }
 }