Move all creating of templates to Smarty::createTemplate, adding a private property containing previously generated templates for speed.

TODO.txt

@@ -2,21 +2,16 @@
 
 ## Review direct variable property access
 - review ->value{$index} in ForTag
-- review ->(step|total|first|last|do_else|key|show|iteration|index)
-- review ->tpl_vars, ->config_vars, ->value
 
+## include inline
 - Re-introduce merge_compiled_includes and the {include inline} attribute?
 
 ## Output buffering
 - Fix ob_ output buffering commands being scattered around the codebase
 
-
 ## Review public static vars
 - such as _CHARSET and _IS_WINDOWS
 
-## Build
-- add compiled lexers and parsers to Release assets automatically
-
 ## Benchmark
 - benchmark to see that performance hasn't degraded
 
@@ -24,7 +19,6 @@
 - Consider phasing out $smarty.block.child as this reverses the inheritance hierarchy and might cause infinite loops
   when combined with $smarty.block.parent
 
-
 ## Plugin system
 - fix template security checks in one place in compiler
 
@@ -35,16 +29,6 @@
 - beautify and review docs, possibly using [
 Material for MkDocs ](https://squidfunk.github.io/mkdocs-material/publishing-your-site/)
 
-## Resources
-- Fix circular deps between resources and sources
-```
-	$smarty = $this->_getSmartyObj();
-		[$name, $type] = \Smarty\Resource\BasePlugin::parseResourceName($config_file, $smarty->default_config_type);
-		$source = new Config($smarty, $config_file, $type, $name);
-
-		$source->handler->getContent($source);
-```
-
 ## Unrelated / other
 - review (and avoid) use of 'clone' keyword
 - compiler->has_code seems silly. Why not have proper return values?

src/Cacheresource/File.php

@@ -205,7 +205,7 @@ class File extends Base
 	    if (isset($resource_name)) {
 		    $_save_stat = $smarty->caching;
 		    $smarty->caching = \Smarty\Smarty::CACHING_LIFETIME_CURRENT;
-		    $tpl = new \Smarty\Template($resource_name, $smarty);
+		    $tpl = $smarty->createTemplate($resource_name);
 		    $smarty->caching = $_save_stat;
 		    // remove from template cache
 		    if ($tpl->getSource()->exists) {

src/Data.php

@@ -454,8 +454,7 @@ class Data
 	 */
 	public function configLoad($config_file, $sections = null)
 	{
-		$smarty = $this->getSmarty();
-		$template = new Template($config_file, $smarty, $this, null, null, null, true);
+		$template = $this->getSmarty()->createTemplate($config_file, null, null, $this, null, null, null, true);
 		$template->caching = Smarty::CACHING_OFF;
 		$template->assign('sections', (array) $sections ?? []);
 		// trigger a call to $this->assignConfigVars
@@ -480,4 +479,18 @@ class Data
 	public function getDefaultScope(): int {
 		return $this->defaultScope;
 	}
+
+	/**
+	 * @return Data|Smarty|null
+	 */
+	public function getParent() {
+		return $this->parent;
+	}
+
+	/**
+	 * @param Data|Smarty|null $parent
+	 */
+	public function setParent($parent): void {
+		$this->parent = $parent;
+	}
 }

src/Smarty.php

@@ -946,24 +946,25 @@ class Smarty extends \Smarty\TemplateBase
         return $this;
     }
 
+	private $templates = [];
+
 	/**
-	 * creates a template object
+	 * Creates a template object
 	 *
 	 * @param Template|null $template_name
-	 *
 	 * @param mixed $cache_id cache id to be used with this template
 	 * @param mixed $compile_id compile id to be used with this template
 	 * @param null $parent next higher level of Smarty variables
-	 * $cache_lifetime
 	 * @param null $caching
 	 * @param null $cache_lifetime
 	 * @param string|null $baseFilePath
+	 * @param bool $isConfig
 	 *
 	 * @return Template template object
 	 * @throws Exception
 	 */
     public function createTemplate($template_name, $cache_id = null, $compile_id = null, $parent = null, $caching = null,
-                                   $cache_lifetime = null, string $baseFilePath = null)
+                                   $cache_lifetime = null, string $baseFilePath = null, bool $isConfig = false)
     {
 
 	    $data = null;
@@ -983,10 +984,21 @@ class Smarty extends \Smarty\TemplateBase
         if (!$this->_templateDirNormalized) {
             $this->_normalizeTemplateConfig(false);
         }
+
         $_templateId = $this->generateUniqueTemplateId($template_name, $cache_id, $compile_id, $caching, $baseFilePath);
 
-	    $tpl = new Template($template_name, $this, $parent ?: $this, $cache_id, $compile_id, $caching);
-		$tpl->templateId = $_templateId;
+	    if (!isset($this->templates[$_templateId])) {
+		    $newTemplate = new Template($template_name, $this, $parent ?: $this, $cache_id, $compile_id, $caching, $isConfig);
+		    $newTemplate->templateId = $_templateId; // @TODO this could go in constructor ^?
+		    $this->templates[$_templateId] = $newTemplate;
+	    }
+
+	    $tpl = clone $this->templates[$_templateId];
+
+		// If $this->allow_ambiguous_resources, the context of the section is different each time
+		if ($this->allow_ambiguous_resources || $tpl->getParent() !== ($parent ?: $this)) {
+			$tpl->setParent($parent ?: $this);
+		}
 
 		if ($cache_lifetime) {
 			$tpl->setCacheLifetime($cache_lifetime);
@@ -1019,7 +1031,7 @@ class Smarty extends \Smarty\TemplateBase
 	 *
 	 * @return string
 	 */
-    public function generateUniqueTemplateId(
+    private function generateUniqueTemplateId(
 	    $template_name,
 	    $cache_id = null,
 	    $compile_id = null,
@@ -1573,7 +1585,7 @@ class Smarty extends \Smarty\TemplateBase
 				//
 				$_smarty->force_compile = $force_compile;
 				try {
-					$_tpl = new \Smarty\Template($_file, $_smarty);
+					$_tpl = $this->createTemplate($_file);
 					$_tpl->caching = self::CACHING_OFF;
 					$_tpl->setSource(
 						$isConfig ? \Smarty\Template\Config::load($_tpl) : \Smarty\Template\Source::load($_tpl)

src/Template.php

@@ -130,7 +130,8 @@ class Template extends TemplateBase {
 		$this->parent = $_parent;
 		// Template resource
 		$this->template_resource = $template_resource;
-		$this->source = $_isConfig ? Config::load($this) : Source::load($this);
+
+		$this->setSource($_isConfig ? Config::load($this) : Source::load($this));
 
 		if ($smarty->security_policy) {
 			$smarty->security_policy->registerCallBacks($this);
@@ -266,12 +267,8 @@ class Template extends TemplateBase {
 		}
 
 		// recursive call ?
-		if ($tpl->getTemplateId() !== $this->getTemplateId()) {
-			$tpl->setSource(Source::load($tpl));
-			$tpl->getCompiled(true);
-			if ($caching !== \Smarty\Template::CACHING_NOCACHE_CODE) {
-				$tpl->getCached(true);
-			}
+		if ($tpl->getTemplateId() !== $this->getTemplateId() && $caching !== \Smarty\Template::CACHING_NOCACHE_CODE) {
+			$tpl->getCached(true);
 		}
 
 		if (!empty($extra_vars)) {
@@ -289,6 +286,11 @@ class Template extends TemplateBase {
 		$tpl->render();
 	}
 
+	public function setParent($parent): void {
+		parent::setParent($parent);
+		$this->setSource($this->source->isConfig ? Config::load($this) : Source::load($this));
+	}
+
 	/**
 	 * Check if this is a sub template
 	 *
@@ -349,8 +351,7 @@ class Template extends TemplateBase {
 	 * @return string
 	 */
 	public function getTemplateId() {
-		return $this->templateId ?? $this->templateId =
-			$this->smarty->generateUniqueTemplateId($this->template_resource, $this->cache_id, $this->compile_id);
+		return $this->templateId;
 	}
 
 	/**