Playground - NoPhpCodeRule

issue-bot/playground.neon

@@ -1,3 +1,4 @@
 rules:
 	- PHPStan\Rules\Playground\FunctionNeverRule
 	- PHPStan\Rules\Playground\MethodNeverRule
+	- PHPStan\Rules\Playground\NoPhpCodeRule

src/Rules/Playground/NoPhpCodeRule.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Playground;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Node\FileNode;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+use function count;
+
+/**
+ * @implements Rule<FileNode>
+ */
+class NoPhpCodeRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return FileNode::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		if (count($node->getNodes()) !== 1) {
+			return [];
+		}
+
+		$html = $node->getNodes()[0];
+		if (!$html instanceof Node\Stmt\InlineHTML) {
+			return [];
+		}
+
+		return [
+			RuleErrorBuilder::message('The example does not contain any PHP code. Did you forget the opening <?php tag?')
+				->identifier('phpstanPlayground.noPhp')
+				->build(),
+		];
+	}
+
+}

tests/PHPStan/Rules/Playground/NoPhpCodeRuleTest.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Playground;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+
+/**
+ * @extends RuleTestCase<NoPhpCodeRule>
+ */
+class NoPhpCodeRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new NoPhpCodeRule();
+	}
+
+	public function testEmptyFile(): void
+	{
+		$this->analyse([__DIR__ . '/data/empty.php'], []);
+	}
+
+	public function testRule(): void
+	{
+		$this->analyse([__DIR__ . '/data/no-php-code.php'], [
+			[
+				'The example does not contain any PHP code. Did you forget the opening <?php tag?',
+				1,
+			],
+		]);
+	}
+
+}

tests/PHPStan/Rules/Playground/data/no-php-code.php

@@ -0,0 +1,4 @@
+class Foo
+{
+	private int $foo;
+}