Report old PHP-Parser v4 class names in PHPStan-related code

conf/config.level0.neon

@@ -18,6 +18,7 @@ rules:
 	- PHPStan\Rules\Api\ApiTraitUseRule
 	- PHPStan\Rules\Api\GetTemplateTypeRule
 	- PHPStan\Rules\Api\NodeConnectingVisitorAttributesRule
+	- PHPStan\Rules\Api\OldPhpParser4ClassRule
 	- PHPStan\Rules\Api\PhpStanNamespaceIn3rdPartyPackageRule
 	- PHPStan\Rules\Api\RuntimeReflectionInstantiationRule
 	- PHPStan\Rules\Api\RuntimeReflectionFunctionRule

src/Rules/Api/OldPhpParser4ClassRule.php

@@ -0,0 +1,79 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Api;
+
+use PhpParser\Node;
+use PhpParser\Node\Name;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+use function array_change_key_case;
+use function array_key_exists;
+use function array_keys;
+use function sprintf;
+use function str_starts_with;
+
+/**
+ * @implements Rule<Name>
+ */
+final class OldPhpParser4ClassRule implements Rule
+{
+
+	private const NAME_MAPPING = [
+		// from https://github.com/nikic/PHP-Parser/blob/master/UPGRADE-5.0.md#renamed-nodes
+		'PhpParser\Node\Scalar\LNumber' => Node\Scalar\Int_::class,
+		'PhpParser\Node\Scalar\DNumber' => Node\Scalar\Float_::class,
+		'PhpParser\Node\Scalar\Encapsed' => Node\Scalar\InterpolatedString::class,
+		'PhpParser\Node\Scalar\EncapsedStringPart' => Node\InterpolatedStringPart::class,
+		'PhpParser\Node\Expr\ArrayItem' => Node\ArrayItem::class,
+		'PhpParser\Node\Expr\ClosureUse' => Node\ClosureUse::class,
+		'PhpParser\Node\Stmt\DeclareDeclare' => Node\DeclareItem::class,
+		'PhpParser\Node\Stmt\PropertyProperty' => Node\PropertyItem::class,
+		'PhpParser\Node\Stmt\StaticVar' => Node\StaticVar::class,
+		'PhpParser\Node\Stmt\UseUse' => Node\UseItem::class,
+	];
+
+	public function getNodeType(): string
+	{
+		return Name::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		$nameMapping = array_change_key_case(self::NAME_MAPPING);
+		$lowerName = $node->toLowerString();
+		if (!array_key_exists($lowerName, $nameMapping)) {
+			return [];
+		}
+
+		$newName = $nameMapping[$lowerName];
+
+		if (!$scope->isInClass()) {
+			return [];
+		}
+
+		$classReflection = $scope->getClassReflection();
+		$hasPhpStanInterface = false;
+		foreach (array_keys($classReflection->getInterfaces()) as $interfaceName) {
+			if (!str_starts_with($interfaceName, 'PHPStan\\')) {
+				continue;
+			}
+
+			$hasPhpStanInterface = true;
+		}
+
+		if (!$hasPhpStanInterface) {
+			return [];
+		}
+
+		return [
+			RuleErrorBuilder::message(sprintf(
+				'Class %s not found. It has been renamed to %s in PHP-Parser v5.',
+				$node->toString(),
+				$newName,
+			))->identifier('phpParser.classRenamed')
+				->build(),
+		];
+	}
+
+}

tests/PHPStan/Rules/Api/OldPhpParser4ClassRuleTest.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Rules\Api;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+
+/**
+ * @extends RuleTestCase<OldPhpParser4ClassRule>
+ */
+class OldPhpParser4ClassRuleTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new OldPhpParser4ClassRule();
+	}
+
+	public function testRule(): void
+	{
+		$this->analyse([__DIR__ . '/data/old-php-parser-4-class.php'], [
+			[
+				'Class PhpParser\Node\Expr\ArrayItem not found. It has been renamed to PhpParser\Node\ArrayItem in PHP-Parser v5.',
+				24,
+			],
+		]);
+	}
+
+}

tests/PHPStan/Rules/Api/data/old-php-parser-4-class.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace OldPhpParser4Class;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+
+class Foo
+{
+
+	public function doFoo(): void
+	{
+		echo \PhpParser\Node\Expr\ArrayItem::class;
+	}
+
+}
+
+class FooRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return \PhpParser\Node\Expr\ArrayItem::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		return [];
+	}
+
+}