- improvement convert template inheritance into runtime processing

- bugfix {$smarty.block.parent} did always reference the root parent block https://github.com/smarty-php/smarty/issues/68

libs/sysplugins/smarty_internal_runtime_block.php

@@ -0,0 +1,98 @@
+<?php
+
+/**
+ * Runtime Method _callBlock, _callParentBlock, _callChildBlock, _registerBlock
+ *
+ * @package    Smarty
+ * @subpackage PluginsInternal
+ * @author     Uwe Tews
+ *
+ **/
+class Smarty_Internal_Runtime_Block
+{
+    
+    public $inheritanceBlocks = array();
+    
+    /**
+     * Call inheritance {block} tag
+     *
+     * @param \Smarty_Internal_Template $callerTpl template object of caller
+     * @param array                     $block     block parameter
+     */
+    public function callBlock(Smarty_Internal_Template $callerTpl, $block)
+    {
+        $function = $block['function'];
+        $level = isset($block['level']) ? $block['level'] : 0;
+        // find to level child block
+        while (!isset($block['callChildBlock']) &&
+            isset($this->inheritanceBlocks[$block['name']][$level])) {
+            $block = $this->inheritanceBlocks[$block['name']][$level];
+            $block['level'] = $level;
+            $level ++;
+        }
+        // ignore hidden block
+        if (isset($block['hide'])) {
+            return;
+        }
+        // root block function for possible parent block call
+        $block['root'] = $function;
+        if (isset($block['append'])) {
+            $this->callParentBlock($callerTpl, $block);
+        }
+        $block['function']($callerTpl, $block);
+        if (isset($block['prepend'])) {
+            $this->callParentBlock($callerTpl, $block);
+        }
+    }
+
+    /**
+     * Call inheritance parent {block} tag
+     *
+     * @param \Smarty_Internal_Template $callerTpl template object of caller
+     * @param array                     $block     block parameter
+     */
+    public function callParentBlock(Smarty_Internal_Template $callerTpl, $block)
+    {
+        $level = isset($block['level']) ? $block['level'] : 0;
+        if (isset($this->inheritanceBlocks[$block['name']][$level - 1])) {
+            // call registered parent
+            $parent = $this->inheritanceBlocks[$block['name']][$level - 1];
+            $parent['root'] = $block['root'];
+            $parent['function']($callerTpl, $parent);
+        } else {
+            // default to root block
+            $block['root']($callerTpl, $block);
+        }
+    }
+
+    /**
+     * Call inheritance child {block} tag
+     *
+     * @param \Smarty_Internal_Template $callerTpl template object of caller
+     * @param array                     $block     block parameter
+     */
+    public function callChildBlock(Smarty_Internal_Template $callerTpl, $block)
+    {
+        $level = isset($block['level']) ? $block['level'] : - 1;
+        if (isset($this->inheritanceBlocks[$block['name']][$level + 1])) {
+            $child = $this->inheritanceBlocks[$block['name']][$level + 1];
+            $child['level'] = $level + 1;
+            $child['function']($callerTpl, $child);
+        }
+    }
+
+    /**
+     * Register inheritance {block} tag
+     *
+     * @param \Smarty_Internal_Template $callerTpl template object of caller
+     * @param array                     $block     block parameter
+     */
+    public function registerBlock(Smarty_Internal_Template $callerTpl, $block)
+    {
+        if (!isset($this->inheritanceBlocks[$block['name']])) {
+            $this->inheritanceBlocks[$block['name']][0] = $block;
+        } else {
+            array_unshift($this->inheritanceBlocks[$block['name']], $block);
+        }
+    }
+}