Fixed all inheritance issues

src/Compile/Tag/ExtendsTag.php

@@ -103,7 +103,9 @@ class ExtendsTag extends Inheritance {
 		$inlineUids = '';
 		if (isset($template) && $compiler->getSmarty()->merge_compiled_includes) {
 			$code = $compiler->compileTag('include', [$template, ['scope' => 'parent']]);
-			if (preg_match('/([,][\s]*[\'][a-z0-9]+[\'][,][\s]*[\']content.*[\'])[)]/', $code, $match)) {
+
+			// @TODO this relies on the generated code to have a certain format and is sure to break someday
+			if (preg_match('/(,\s*\'[a-z0-9]+\',\s*\'content.*\')/', $code, $match)) {
 				$inlineUids = $match[1];
 			}
 		}

src/Compile/Tag/IncludeTag.php

@@ -222,9 +222,10 @@ class IncludeTag extends Base {
 			if (isset($_assign)) {
 				$_output .= "ob_start();\n";
 			}
-			$_output .= "\$_smarty_tpl->_subTemplateRender({$fullResourceName}, {$_cache_id}, \$_smarty_tpl->compile_id, 
+			$_output .= "\$_smarty_tpl->renderSubTemplate({$fullResourceName}, {$_cache_id}, \$_smarty_tpl->compile_id, " .
-			{$_caching}, {$_cache_lifetime}, {$_vars}, '{$compiler->getParentCompiler()->mergedSubTemplatesData[$uid][$t_hash]['uid']}', 
+				"{$_caching}, {$_cache_lifetime}, {$_vars}, " .
-			'{$compiler->getParentCompiler()->mergedSubTemplatesData[$uid][$t_hash]['func']}', (int) {$_scope});\n";
+				"'{$compiler->getParentCompiler()->mergedSubTemplatesData[$uid][$t_hash]['uid']}', " .
+				"'{$compiler->getParentCompiler()->mergedSubTemplatesData[$uid][$t_hash]['func']}', (int) {$_scope});\n";
 			if (isset($_assign)) {
 				$_output .= "\$_smarty_tpl->assign({$_assign}, ob_get_clean(), false, {$_scope});\n";
 			}
@@ -239,7 +240,8 @@ class IncludeTag extends Base {
 		if (isset($_assign)) {
 			$_output .= "ob_start();\n";
 		}
-		$_output .= "\$_smarty_tpl->_subTemplateRender({$fullResourceName}, $_cache_id, \$_smarty_tpl->compile_id, $_caching, $_cache_lifetime, $_vars, null, null, (int) {$_scope});\n";
+		$_output .= "\$_smarty_tpl->renderSubTemplate({$fullResourceName}, $_cache_id, \$_smarty_tpl->compile_id, " .
+			"$_caching, $_cache_lifetime, $_vars, null, null, (int) {$_scope});\n";
 		if (isset($_assign)) {
 			$_output .= "\$_smarty_tpl->assign({$_assign}, ob_get_clean(), false, {$_scope});\n";
 		}

src/Runtime/InheritanceRuntime.php

@@ -24,42 +24,42 @@ class InheritanceRuntime {
 	 *
 	 * @var int
 	 */
-	public $state = 0;
+	private $state = 0;
 
 	/**
 	 * Array of root child {block} objects
 	 *
 	 * @var \Smarty\Runtime\Block[]
 	 */
-	public $childRoot = [];
+	private $childRoot = [];
 
 	/**
 	 * inheritance template nesting level
 	 *
 	 * @var int
 	 */
-	public $inheritanceLevel = 0;
+	private $inheritanceLevel = 0;
 
 	/**
 	 * inheritance template index
 	 *
 	 * @var int
 	 */
-	public $tplIndex = -1;
+	private $tplIndex = -1;
 
 	/**
 	 * Array of template source objects
 	 *
 	 * @var Source[]
 	 */
-	public $sources = [];
+	private $sources = [];
 
 	/**
 	 * Stack of source objects while executing block code
 	 *
 	 * @var Source[]
 	 */
-	public $sourceStack = [];
+	private $sourceStack = [];
 
 	/**
 	 * Initialize inheritance
@@ -71,6 +71,7 @@ class InheritanceRuntime {
 	public function init(Template $tpl, $initChild, $blockNames = []) {
 		// if called while executing parent template it must be a sub-template with new inheritance root
 		if ($initChild && $this->state === 3 && (strpos($tpl->template_resource, 'extendsall') === false)) {
+			$tpl->setInheritance(clone $tpl->getSmarty()->getRuntime('Inheritance'));
 			$tpl->getInheritance()->init($tpl, $initChild, $blockNames);
 			return;
 		}
@@ -112,7 +113,7 @@ class InheritanceRuntime {
 			$this->state = 2;
 		}
 		if (isset($template)) {
-			$tpl->_subTemplateRender(
+			$tpl->renderSubTemplate(
 				$template,
 				$tpl->cache_id,
 				$tpl->compile_id,

src/Template.php

@@ -105,6 +105,10 @@ class Template extends TemplateBase {
 	 */
 	private $right_delimiter = null;
 
+	/**
+	 * @var InheritanceRuntime|null
+	 */
+	private $inheritance;
 
 	/**
 	 * Create template data object
@@ -242,7 +246,7 @@ class Template extends TemplateBase {
 	 *
 	 * @throws Exception
 	 */
-	public function _subTemplateRender(
+	public function renderSubTemplate(
 		$template_name,
 		$cache_id,
 		$compile_id,
@@ -258,6 +262,7 @@ class Template extends TemplateBase {
 
 		$tpl = $this->getSmarty()->createTemplate($template_name, $cache_id, $compile_id, $this, $caching, $cache_lifetime, $baseFilePath);
 		$tpl->setCached($this->getCached()); // re-use the same Cache object across subtemplates to gather hashes and file dependencies.
+		$tpl->setInheritance($this->getInheritance()); // re-use the same Inheritance object inside the inheritance tree
 
 		if ($scope) {
 			$tpl->setDefaultScope($scope);
@@ -512,7 +517,21 @@ class Template extends TemplateBase {
 	 * @throws Exception
 	 */
 	public function getInheritance(): InheritanceRuntime {
-		return $this->getSmarty()->getRuntime('Inheritance');
+		if (is_null($this->inheritance)) {
+			$this->inheritance = clone $this->getSmarty()->getRuntime('Inheritance');
+		}
+		return $this->inheritance;
+	}
+
+	/**
+	 * Sets a new InheritanceRuntime object.
+	 *
+	 * @param InheritanceRuntime $inheritanceRuntime
+	 *
+	 * @return void
+	 */
+	public function setInheritance(InheritanceRuntime $inheritanceRuntime) {
+		$this->inheritance = $inheritanceRuntime;
 	}
 
 	/**

tests/UnitTests/TemplateSource/TagTests/BockExtend/CompileBlockExtendsTest.php

@@ -10,10 +10,6 @@ use Smarty\Template;
 
 /**
  * class for block extends compiler tests
- *
- *
- * @preserveGlobalState    disabled
- *
  */
 class CompileBlockExtendsTest extends PHPUnit_Smarty
 {