Strip leading @ from InvalidTag name

Tag names are normally exposed without their leading "@", but when an InvalidTag is built from the name PHPStan's phpdoc-parser advertises (e.g. for a malformed `@var $self SomeClass`), the name is passed through as-is and `getName()` ends up returning "@var" instead of "var". Normalizing the name at the single entry point (`InvalidTag::create`) keeps the behaviour consistent with every other tag in the library regardless of the upstream parser's convention.

Fixes #449

Author: lacatoire

src/DocBlock/Tags/InvalidTag.php

@@ -18,6 +18,7 @@
 use function is_array;
 use function is_object;
 use function is_resource;
+use function ltrim;
 use function sprintf;
 
 use const PHP_VERSION_ID;
@@ -58,7 +59,9 @@ public function getName(): string
 
     public static function create(string $body, string $name = ''): self
     {
-        return new self($name, $body);
+        // Some upstream parsers (e.g. phpstan/phpdoc-parser) keep the leading "@" in the tag name they expose.
+        // All other tags strip it before reaching the Tag layer, so normalize here to keep getName() consistent.
+        return new self(ltrim($name, '@'), $body);
     }
 
     public function withError(Throwable $exception): self

tests/unit/DocBlock/Tags/Factory/AbstractPHPStanFactoryTest.php

@@ -68,7 +68,7 @@ public function testCreateReturnsInvalidTagWhenNoFactorySupports(): void
         $result = $sut->create('@unknown string $param');
 
         self::assertInstanceOf(InvalidTag::class, $result);
-        self::assertEquals('@unknown', $result->getName());
+        self::assertEquals('unknown', $result->getName());
     }
 
     /**

tests/unit/DocBlock/Tags/InvalidTagTest.php

@@ -33,6 +33,14 @@ public function testCreationWithoutError(): void
         self::assertNull($tag->getException());
     }
 
+    public function testCreationStripsLeadingAtFromName(): void
+    {
+        $tag = InvalidTag::create('Body', '@var');
+
+        self::assertSame('var', $tag->getName());
+        self::assertSame('@var Body', $tag->render());
+    }
+
     /**
      * @covers ::withError
      * @covers ::__toString