Added custom template class option

src/Handlebars/Handlebars.php

@@ -9,6 +9,7 @@
  * @package   Handlebars
  * @author    fzerorubigd <fzerorubigd@gmail.com>
  * @author    Behrooz Shabani <everplays@gmail.com>
+ * @author    Jeff Turcotte <jeff.turcotte@gmail.com>
  * @copyright 2010-2012 (c) Justin Hileman
  * @copyright 2012 (c) ParsPooyesh Co
  * @copyright 2013 (c) Behrooz Shabani
@@ -84,6 +85,11 @@ class Handlebars
      */
     private $_cache;
 
+    /**
+     * @var string the class to use for the template
+     */
+    private $_templateClass = 'Handlebars\\Template';
+
     /**
      * @var callable escape function to use
      */
@@ -108,6 +114,7 @@ class Handlebars
      * loader         => Loader object
      * partials_loader => Loader object
      * cache          => Cache object
+     * template_class => the class to use for the template object
      *
      * @param array $options array of options to set
      *
@@ -131,6 +138,10 @@ class Handlebars
             $this->setCache($options['cache']);
         }
 
+        if (isset($options['template_class'])) {
+            $this->setTemplateClass($options['template_class']);
+        }
+
         if (isset($options['escape'])) {
             if (!is_callable($options['escape'])) {
                 throw new \InvalidArgumentException(
@@ -438,6 +449,24 @@ class Handlebars
         return $this->_parser;
     }
 
+    /**
+     * Sets the class to use for the template object
+     *
+     * @param string $class the class name
+     *
+     * @return void
+     */
+    public function setTemplateClass($class)
+    {
+        if (!is_a($class, 'Handlebars\\Template', true)) {
+            throw new \InvalidArgumentException(
+                'Custom template class must extend Template'
+            );
+        }
+
+        $this->_templateClass = $class;
+    }
+
     /**
      * Load a template by name with current template loader
      *
@@ -450,7 +479,7 @@ class Handlebars
         $source = $this->getLoader()->load($name);
         $tree = $this->_tokenize($source);
 
-        return new Template($this, $tree, $source);
+        return new $this->_templateClass($this, $tree, $source);
     }
 
     /**
@@ -468,7 +497,7 @@ class Handlebars
         $source = $this->getPartialsLoader()->load($name);
         $tree = $this->_tokenize($source);
 
-        return new Template($this, $tree, $source);
+        return new $this->_templateClass($this, $tree, $source);
     }
 
     /**
@@ -509,7 +538,7 @@ class Handlebars
     {
         $tree = $this->_tokenize($source);
 
-        return new Template($this, $tree, $source);
+        return new $this->_templateClass($this, $tree, $source);
     }
 
     /**
@@ -532,4 +561,4 @@ class Handlebars
         return $tree;
     }
 
-}
+}

src/Handlebars/Template.php

@@ -45,9 +45,14 @@ class Template
      */
     protected $handlebars;
 
-
+    /**
+     * @var array The tokenized tree
+     */
     protected $tree = array();
 
+    /**
+     * @var string The template source
+     */
     protected $source = '';
 
     /**

tests/Xamin/HandlebarsTest.php

@@ -780,6 +780,39 @@ class HandlebarsTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+
+    /**
+     * Test invalid custom template class
+     *
+     * @expectedException \InvalidArgumentException
+     */
+    public function testInvalidCustomTemplateClass()
+    {
+        $loader = new \Handlebars\Loader\StringLoader();
+        $engine = new \Handlebars\Handlebars(array(
+            'loader' => $loader,
+            'template_class' => 'stdclass'
+        ));
+    }
+
+    /**
+     * Test custom template class
+     */
+    public function testValidCustomTemplateClass()
+    {
+        Handlebars\Autoloader::register(realpath(__DIR__ . '/../fixture/'));
+
+        $loader = new \Handlebars\Loader\StringLoader();
+        $engine = new \Handlebars\Handlebars(array(
+            'loader' => $loader,
+            'template_class' => 'Handlebars\CustomTemplate'
+        ));
+
+        $render = $engine->render('Original Template', array());
+
+        $this->assertEquals($render, 'Altered Template');
+    }
+
     /**
      * Test for proper handling of the length property
      **/

tests/fixture/Handlebars/CustomTemplate.php

@@ -0,0 +1,12 @@
+<?php
+namespace Handlebars;
+
+use Handlebars\Template;
+
+class CustomTemplate extends Template
+{
+    public function render($context)
+    {
+        return 'Altered Template';
+    }
+}