fix(NAssetNode): generate a unique temp var for n:asset macros

src/Bridges/AssetsLatte/Nodes/NAssetNode.php

@@ -32,6 +32,7 @@ final class NAssetNode extends StatementNode
 	public ArrayNode $attributes;
 	public AreaNode $content;
 	public bool $optional;
+	private string $tmpVar;
 
 
 	/** @return \Generator<int, ?list<string>, array{AreaNode, ?Tag}, static> */
@@ -56,12 +57,15 @@ public static function create(Tag $tag): \Generator
 
 	public function print(PrintContext $context): string
 	{
+		$this->tmpVar = '$ʟ_asset_' . $context->generateId();
+
 		return $context->format(
 			<<<'XX'
-				if ($ʟ_tmp = $this->global->assets->resolve(%node, %node, %dump)) %line {
+				if (%raw = $this->global->assets->resolve(%node, %node, %dump)) %line {
 					%node
 				}
 				XX,
+			$this->tmpVar,
 			$this->name,
 			$this->attributes,
 			$this->optional,
@@ -77,8 +81,9 @@ private function init(Tag $tag): void
 		assert($el !== null);
 		$tag->replaceNAttribute(new AuxiliaryNode(fn(PrintContext $context) => $context->format(
 			<<<'XX'
-				echo $this->global->assets->renderAttributes($ʟ_tmp, %dump, %dump);
+				echo $this->global->assets->renderAttributes(%raw, %dump, %dump);
 				XX,
+			$this->tmpVar,
 			strtolower($el->name),
 			self::findUsedAttributes($el),
 		)));

tests/Bridges.Latte/n-asset-n-class.phpt

@@ -0,0 +1,82 @@
+<?php declare(strict_types=1);
+
+use Nette\Assets\ImageAsset;
+use Nette\Assets\Registry;
+use Nette\Bridges\AssetsLatte\LatteExtension;
+use Tester\Assert;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+test('n:class before n:asset on the same element does not clobber the resolved asset', function () {
+	$asset = new ImageAsset(
+		url: 'https://example.com/image.jpg',
+		width: 800,
+		height: 600,
+	);
+
+	$mockRegistry = Mockery::mock(Registry::class);
+	$mockRegistry->expects()->getAsset('foo', [])->andReturn($asset);
+
+	$latte = new Latte\Engine;
+	$latte->addExtension(new LatteExtension($mockRegistry));
+	$latte->setLoader(new Latte\Loaders\StringLoader);
+
+	$result = $latte->renderToString('<img n:class="\'foo\', \'bar\'" n:asset=foo>');
+	Assert::same('<img class="foo bar" src="https://example.com/image.jpg" width="800" height="600">', $result);
+});
+
+
+test('n:asset before n:class on the same element does not clobber the resolved asset', function () {
+	$asset = new ImageAsset(
+		url: 'https://example.com/image.jpg',
+		width: 800,
+		height: 600,
+	);
+
+	$mockRegistry = Mockery::mock(Registry::class);
+	$mockRegistry->expects()->getAsset('foo', [])->andReturn($asset);
+
+	$latte = new Latte\Engine;
+	$latte->addExtension(new LatteExtension($mockRegistry));
+	$latte->setLoader(new Latte\Loaders\StringLoader);
+
+	$result = $latte->renderToString('<img n:asset=foo n:class="\'foo\', \'bar\'">');
+	Assert::same('<img src="https://example.com/image.jpg" width="800" height="600" class="foo bar">', $result);
+});
+
+
+test('multiple n:asset + n:class elements in one template each keep their own asset', function () {
+	$first = new ImageAsset(url: 'https://example.com/first.jpg', width: 100, height: 100);
+	$second = new ImageAsset(url: 'https://example.com/second.jpg', width: 200, height: 200);
+
+	$mockRegistry = Mockery::mock(Registry::class);
+	$mockRegistry->expects()->getAsset('first', [])->andReturn($first);
+	$mockRegistry->expects()->getAsset('second', [])->andReturn($second);
+
+	$latte = new Latte\Engine;
+	$latte->addExtension(new LatteExtension($mockRegistry));
+	$latte->setLoader(new Latte\Loaders\StringLoader);
+
+	$result = $latte->renderToString(
+		'<img n:class="\'a\'" n:asset=first><img n:class="\'b\'" n:asset=second>',
+	);
+	Assert::same(
+		'<img class="a" src="https://example.com/first.jpg" width="100" height="100">'
+		. '<img class="b" src="https://example.com/second.jpg" width="200" height="200">',
+		$result,
+	);
+});
+
+
+test('n:asset? combined with n:class still renders when the asset is missing', function () {
+	$mockRegistry = Mockery::mock(Registry::class);
+	$mockRegistry->expects()->tryGetAsset('foo', [])->andReturn(null);
+
+	$latte = new Latte\Engine;
+	$latte->addExtension(new LatteExtension($mockRegistry));
+	$latte->setLoader(new Latte\Loaders\StringLoader);
+
+	$result = $latte->renderToString('<img n:class="\'foo\'" n:asset?=foo>');
+	Assert::same('', $result);
+});