From 8e4ffaefa2c9ec7b9de9f0511a8fa17732c9af3b Mon Sep 17 00:00:00 2001
From: WanWizard <wanwizard@wanwizard.eu>
Date: Wed, 17 Jan 2018 14:30:25 +0100
Subject: [PATCH] experimental support for Handlebar templates

using the zordius/lightncandy renderer
---
 bootstrap.php               |  1 +
 classes/view/handlebars.php | 63 +++++++++++++++++++++++++++++++++++++
 config/parser.php           | 38 +++++++++++++++-------
 3 files changed, 91 insertions(+), 11 deletions(-)
 create mode 100644 classes/view/handlebars.php

diff --git a/bootstrap.php b/bootstrap.php
index 8156e12..3aee2eb 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -22,6 +22,7 @@
 	'Parser\\View_Twig'             => __DIR__.'/classes/view/twig.php',
 	'Parser\\View_HamlTwig'         => __DIR__.'/classes/view/hamltwig.php',
 	'Parser\\View_Jade'             => __DIR__.'/classes/view/jade.php',
+	'Parser\\View_Handlebars'       => __DIR__.'/classes/view/handlebars.php',
 	'Parser\\View_Haml'             => __DIR__.'/classes/view/haml.php',
 	'Parser\\View_Smarty'           => __DIR__.'/classes/view/smarty.php',
 	'Parser\\View_Phptal'           => __DIR__.'/classes/view/phptal.php',
diff --git a/classes/view/handlebars.php b/classes/view/handlebars.php
new file mode 100644
index 0000000..2ee0201
--- /dev/null
+++ b/classes/view/handlebars.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * Fuel
+ *
+ * Fuel is a fast, lightweight, community driven PHP5 framework.
+ *
+ * @package    Fuel
+ * @version    1.8
+ * @author     Fuel Development Team
+ * @license    MIT License
+ * @copyright  2010 - 2017 Fuel Development Team
+ * @link       http://fuelphp.com
+ */
+
+namespace Parser;
+
+use LightnCandy\LightnCandy;
+
+class View_Handlebars extends \View
+{
+	// default extension used by this template engine
+	public $extension = 'hbs';
+
+	protected function process_file($file_override = false)
+	{
+		// get the template filename
+		$file = $file_override ?: $this->file_name;
+
+		// compiled template path
+		$path = rtrim(\Config::get('parser.View_Handlebars.compile_dir', APPPATH.'tmp'.DS.'handlebars'),DS).DS;
+
+		// construct the compiled filename
+		$compiled = md5($file);
+		$compiled = $path.substr($compiled, 0, 1).DS.substr($compiled, 1, 1).DS.substr($compiled, 2).'.'.$this->extension;
+
+		// do we need to compile?
+		if ( ! is_file($compiled) or filemtime($file) > filemtime($compiled) or \Config::get('parser.View_Handlebars.force_compile', true))
+		{
+			file_put_contents($compiled, '<?php ' . LightnCandy::compile(
+				file_get_contents($file),
+				array(
+					'partialresolver' => function($cx, $name) { return \Finder::search('views', $name, '.'.$this->extension, false, false); }
+				) + \Config::get('parser.View_Handlebars.environment', array())
+			));
+		}
+
+		// fetch the compiled template and render it
+		try
+		{
+			$result = include($compiled);
+			$result = $result($this->get_data());
+		}
+		catch (\Exception $e)
+		{
+			// Delete the output buffer & re-throw the exception
+			ob_end_clean();
+			throw $e;
+		}
+
+		$this->unsanitize($data);
+		return $result;
+	}
+}
diff --git a/config/parser.php b/config/parser.php
index d995d14..e6f15a9 100644
--- a/config/parser.php
+++ b/config/parser.php
@@ -21,23 +21,26 @@
  * This will allow you to upgrade fuel without losing your custom config.
  */
 
+use LightnCandy\LightnCandy;
+
 return array(
 
 	// ------------------------------------------------------------------------
 	// Register extensions to their parsers, either classname or array config
 	// ------------------------------------------------------------------------
 	'extensions' => array(
-		'php'      => 'View',
-		'twig'     => 'View_Twig',
-		'mthaml'   =>  array('class' => 'View_HamlTwig', 'extension' => 'haml'),
-		'mustache' => 'View_Mustache',
-		'md'       => 'View_Markdown',
-		'dwoo'     => array('class' => 'View_Dwoo', 'extension' => 'tpl'),
-		'jade'     => 'View_Jade',
-		'haml'     => 'View_Haml',
-		'smarty'   => 'View_Smarty',
-		'phptal'   => 'View_Phptal',
-		'lex'      => 'View_Lex',
+		'php'        => 'View',
+		'twig'       => 'View_Twig',
+		'mthaml'     =>  array('class' => 'View_HamlTwig', 'extension' => 'haml'),
+		'mustache'   => 'View_Mustache',
+		'md'         => 'View_Markdown',
+		'dwoo'       => array('class' => 'View_Dwoo', 'extension' => 'tpl'),
+		'jade'       => 'View_Jade',
+		'handlebars' => 'View_Handlebars',
+		'haml'       => 'View_Haml',
+		'smarty'     => 'View_Smarty',
+		'phptal'     => 'View_Phptal',
+		'lex'        => 'View_Lex',
 	),
 
 	// ------------------------------------------------------------------------
@@ -196,4 +199,17 @@
 		'scope_glue' => '.',
 		'allow_php'  => false,
 	),
+
+	// Handlebars ( https://github.com/zordius/lightncandy )
+	// Packagist url: https://packagist.org/packages/zordius/lightncandy
+	// ------------------------------------------------------------------------
+	'View_Handlebars' => array(
+		'force_compile'   => true,
+		'compile_dir'     => APPPATH.'tmp'.DS.'handlebars'.DS,
+		'environment'     => array(
+			'flags'           => LightnCandy::FLAG_ERROR_EXCEPTION | LightnCandy::FLAG_ELSE | LightnCandy::FLAG_HBESCAPE | LightnCandy::FLAG_JS,
+			'helpers'         => array(),
+			'helperresolver'  => function($cx, $name) { return; },
+		),
+	),
 );