Limit characters after tag name

Previously we allowed all characters after a tag name which made
it a bit fuzzy how tags are handled. Psr-5 is more strict about
the characters that are allowed in tags and those that are part of
the body. A tag name can now be followed by `(`, <space> and `{` all
other characters are forbidden. The first character of the body is
not restricted anymore.

fixes #165

src/DocBlock/StandardTagFactory.php

@@ -46,6 +46,7 @@ use function count;
 use function get_class;
 use function preg_match;
 use function strpos;
+use function trim;
 
 /**
  * Creates a Tag object given the contents of a tag.
@@ -147,13 +148,7 @@ final class StandardTagFactory implements TagFactory
 
         [$tagName, $tagBody] = $this->extractTagParts($tagLine);
 
-        if ($tagBody !== '' && strpos($tagBody, '[') === 0) {
+        return $this->createTag(trim($tagBody), $tagName, $context);
-            throw new InvalidArgumentException(
-                'The tag "' . $tagLine . '" does not seem to be wellformed, please check it for errors'
-            );
-        }
-
-        return $this->createTag($tagBody, $tagName, $context);
     }
 
     /**
@@ -199,7 +194,7 @@ final class StandardTagFactory implements TagFactory
     private function extractTagParts(string $tagLine) : array
     {
         $matches = [];
-        if (!preg_match('/^@(' . self::REGEX_TAGNAME . ')(?:\s*([^\s].*)|$)/us', $tagLine, $matches)) {
+        if (!preg_match('/^@(' . self::REGEX_TAGNAME . ')((?:[\s\(\{:])\s*([^\s].*)|$)/us', $tagLine, $matches)) {
             throw new InvalidArgumentException(
                 'The tag "' . $tagLine . '" does not seem to be wellformed, please check it for errors'
             );

tests/unit/DocBlock/StandardTagFactoryTest.php

@@ -13,6 +13,7 @@ declare(strict_types=1);
 
 namespace phpDocumentor\Reflection\DocBlock;
 
+use InvalidArgumentException;
 use Mockery as m;
 use phpDocumentor\Reflection\DocBlock\Tags\Author;
 use phpDocumentor\Reflection\DocBlock\Tags\Formatter;
@@ -341,4 +342,90 @@ class StandardTagFactoryTest extends TestCase
 
         $this->assertInstanceOf(InvalidTag::class, $tag);
     }
+
+    /**
+     * @dataProvider validTagProvider
+     */
+    public function testValidFormattedTags(string $input, string $tagName, string $render) : void
+    {
+        $fqsenResolver = $this->prophesize(FqsenResolver::class);
+        $tagFactory = new StandardTagFactory($fqsenResolver->reveal());
+        $tagFactory->registerTagHandler('tag', Generic::class);
+        $tag = $tagFactory->create($input);
+
+        self::assertSame($tagName, $tag->getName());
+        self::assertSame($render, $tag->render());
+    }
+
+    /**
+     * @return string[][]
+     *
+     * @phpstan-return array<string, array<int, string>>
+     */
+    public function validTagProvider() : array
+    {
+        //rendered result is adding a space, because the tags are not rendered properly.
+        return [
+            'tag without body' => [
+                '@tag',
+                'tag',
+                '@tag',
+            ],
+            'tag specialization' => [
+                '@tag:some-spec',
+                'tag',
+                '@tag :some-spec',
+            ],
+            'tag with textual description' => [
+                '@tag some text',
+                'tag',
+                '@tag some text',
+            ],
+            'tag [a]' => [
+                '@tag [is valid]',
+                'tag',
+                '@tag [is valid]',
+            ],
+            'tag {a}' => [
+                '@tag {is valid}',
+                'tag',
+                '@tag {is valid}',
+            ],
+            'tag{a}' => [
+                '@tag{is valid}',
+                'tag',
+                '@tag {is valid}',
+            ],
+            'tag(a)' => [
+                '@tag(is valid)',
+                'tag',
+                '@tag (is valid)',
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider invalidTagProvider
+     */
+    public function testInValidFormattedTags(string $input) : void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $fqsenResolver = $this->prophesize(FqsenResolver::class);
+        $tagFactory = new StandardTagFactory($fqsenResolver->reveal());
+        $tagFactory->registerTagHandler('tag', Generic::class);
+        $tagFactory->create($input);
+    }
+
+    /**
+     * @return string[][]
+     *
+     * @phpstan-return list<array<int, string>>
+     */
+    public function invalidTagProvider() : array
+    {
+        return [
+            ['@tag[invalid]'],
+            ['@tag@invalid'],
+        ];
+    }
 }