From 56e45145ec37e95d083e176e389bf2fcce0fcc15 Mon Sep 17 00:00:00 2001
From: David Grudl <david@grudl.com>
Date: Wed, 27 Apr 2016 12:51:40 +0200
Subject: [PATCH] Latte: support for single block rendering [Closes #101]

---
 src/Latte/Engine.php                    |  8 ++++----
 src/Latte/Macros/BlockMacros.php        |  2 +-
 src/Latte/Macros/BlockMacrosRuntime.php |  9 +++++++--
 tests/Latte/Engine.renderBlock.phpt     | 19 +++++++++++++++++++
 4 files changed, 31 insertions(+), 7 deletions(-)
 create mode 100644 tests/Latte/Engine.renderBlock.phpt

diff --git a/src/Latte/Engine.php b/src/Latte/Engine.php
index cc907b5375..374a025793 100644
--- a/src/Latte/Engine.php
+++ b/src/Latte/Engine.php
@@ -64,10 +64,10 @@ public function __construct()
 	 * Renders template to output.
 	 * @return void
 	 */
-	public function render($name, array $params = [])
+	public function render($name, array $params = [], $block = NULL)
 	{
 		$this->createTemplate($name)
-			->setParameters($params)
+			->setParameters($params + ['_block' => $block])
 			->render();
 	}
 
@@ -76,11 +76,11 @@ public function render($name, array $params = [])
 	 * Renders template to string.
 	 * @return string
 	 */
-	public function renderToString($name, array $params = [])
+	public function renderToString($name, array $params = [], $block = NULL)
 	{
 		ob_start(function () {});
 		try {
-			$this->render($name, $params);
+			$this->render($name, $params, $block);
 		} catch (\Throwable $e) {
 			ob_end_clean();
 			throw $e;
diff --git a/src/Latte/Macros/BlockMacros.php b/src/Latte/Macros/BlockMacros.php
index 5297009731..31b20e61d5 100644
--- a/src/Latte/Macros/BlockMacros.php
+++ b/src/Latte/Macros/BlockMacros.php
@@ -88,7 +88,7 @@ public function finalize()
 			}
 			$compiler->addProperty('blocks', array_merge_recursive($functions, $this->blockTypes));
 
-			$prolog = 'Latte\Macros\BlockMacrosRuntime::initialize($this, $_b)';
+			$prolog = 'if (Latte\Macros\BlockMacrosRuntime::initialize($this, $_b)) return;';
 			if (!$this->namedBlocks) {
 				$epilog = 'if (Latte\Macros\BlockMacrosRuntime::progress($this, get_defined_vars())) return;';
 			}
diff --git a/src/Latte/Macros/BlockMacrosRuntime.php b/src/Latte/Macros/BlockMacrosRuntime.php
index c2ea3694a9..d79be98d2a 100644
--- a/src/Latte/Macros/BlockMacrosRuntime.php
+++ b/src/Latte/Macros/BlockMacrosRuntime.php
@@ -20,7 +20,7 @@ class BlockMacrosRuntime
 
 
 	/**
-	 * @return void
+	 * @return bool
 	 */
 	public static function initialize(Latte\Template $template, \stdClass $blocks)
 	{
@@ -29,8 +29,13 @@ public static function initialize(Latte\Template $template, \stdClass $blocks)
 			self::checkType($info[1], $blocks->types, $name);
 		}
 
-		if ($template->params['_l']->extends = $template->getExtends()) {
+		$params = $template->params;
+		if ($params['_l']->extends = $template->getExtends()) {
 			ob_start(function () {});
+
+		} elseif (!empty($params['_block']) && empty($params['_g']->includingBlock)) {
+			self::callBlock($blocks, $params['_block'], $params);
+			return TRUE;
 		}
 	}
 
diff --git a/tests/Latte/Engine.renderBlock.phpt b/tests/Latte/Engine.renderBlock.phpt
new file mode 100644
index 0000000000..35f3281a31
--- /dev/null
+++ b/tests/Latte/Engine.renderBlock.phpt
@@ -0,0 +1,19 @@
+<?php
+
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+$latte = new Latte\Engine;
+
+Assert::match(
+	'This is definition #5',
+	trim($latte->renderToString(__DIR__ . '/templates/defineblock.latte', ['var' => 5], 'test'))
+);
+
+Assert::match(
+	'Homepage | My websiteMy website',
+	$latte->renderToString(__DIR__ . '/templates/inheritance.child1.latte', [], 'title')
+);