Переменные через точку

.gitignore

@@ -0,0 +1,3 @@
+*.bak
+node_modules
+temp

example.php

@@ -2,8 +2,11 @@
 
 require_once 'klein.php';
 
-echo Klein::render('index.html', array(
+$tpl = new Klein();
+$tpl->compile('index.html');
+
+echo $tpl->render(array(
     'style' => array('style.css'),
-    'script' => array('script.js'),
+    'script' => array(array('name' => 'script1.js'), array('name' => 'script2.js')),
     'content' => 'test'
 ));

klein.php

@@ -1,27 +1,58 @@
 <?php
 
-class Klein {
+class Klein {  
-    static function render($html, $vars) {
+    private $code;
-        $data = file_get_contents($html);
+
-        $pattern = array(
+    function compile($html) {
-            "/{%\s*for\s+(\w+)\s+in\s+(\w+)\s*%}/" => "<?php foreach(\$$2 as \$$1): ?>",
+        $arg = function($name) {
-            "/{%\s*if\s+(\w+)\s*%}/" => "<?php if(isset(\$$1)): ?>",
+            $list = explode(".", $name);
-            "/{%\s*block\s+(\w+)\s*%}/" => "<?php function $1() { ?>",
+            $first = array_shift($list);
-            "/{%\s*endblock\s*%}/" => "<?php } ?>",
+            return "\$$first" . implode("", array_map(function($x) { return "['$x']"; }, $list));
-            "/{%\s*endfor\s*%}/" => "<?php endforeach; ?>",
+        };
-            "/{%\s*endif\s*%}/" => "<?php endif; ?>",
+
-            "/{{\s*(\w+)\s*}}/" => "<?php echo \$$1; ?>",
+        $var = "(\w+(\s*\.\s*\w+)*)";
-        );
+
+        list($for, $endfor, $if, $endif) = array_map(
+            function ($args) {
+                $body = implode($args, "\s*");
+                return "/{%\s*$body\s*%}/";
+            },[
+                ['for', $var, 'in', $var],
+                ['endfor'],
+                ['if', $var],
+                ['endif']
+            ]);
+
+        $pattern = [
+            $for => function ($x) use($arg) { 
+                return "<?php foreach({$arg($x[3])} as {$arg($x[1])}): ?>"; 
+            },
+            $endfor => function ($x) { 
+                return "<?php endforeach; ?>"; 
+            },
+            $if => function ($x) use ($arg) { 
+                return "<?php if(isset({$arg($x[1])})): ?>"; 
+            },
+            $endif => function ($x) { 
+                return "<?php endif; ?>"; 
+            },
+            "/{{\s*$var\s*}}/" => function ($x) use ($arg) { 
+                return "<?php echo {$arg($x[1])}; ?>"; 
+            },
+        ];
     
-        $result = $data;
+        $result = file_get_contents($html);
         foreach($pattern as $key => $value) {
-            $result = preg_replace($key, $value, $result);
+            $result = preg_replace_callback($key, $value, $result);
         }
-    
+
-        extract($vars);
+        $this->code = $result;
-        
+    }
+
+    function render($vars) {    
+        extract($vars);        
         ob_start();
-        eval(" ?>".$result."<?php ");
+        eval(" ?>".$this->code."<?php ");
         return ob_get_clean();
     }
 }