Allow a colon in tag names for namespacing.

Author: ThomasNunninger

src/DocBlockParser.php

@@ -98,7 +98,7 @@ private function extractTagsAndArguments(array $lines) : array
         foreach ($lines as $line) {
             if ($currentState === $stateSearchStartOfTag) {
                 // pattern: ^@<name-of-tag><optional: space plus rest of line>
-                $pattern = '(^@([a-z-]+)( (.*))?$)';
+                $pattern = '(^@([a-z:-]+)( (.*))?$)';
                 $count = preg_match($pattern, $line, $matches);
                 if (1 !== $count) {
                     continue;

tests/PhpUnit/DocBlockParserTest.php

@@ -90,6 +90,7 @@ public function it_parses_single_line_annotations_of_a_doc_block()
  * @some-tag some argument string for the first some-tag
  * @some-tag some other argument string for the second some-tag
  * @othertag some argument string for another tag
+ * @namespaced:tag some argument
  */
 DocBlock;
 
@@ -113,6 +114,11 @@ public function it_parses_single_line_annotations_of_a_doc_block()
             'some argument string for another tag',
             Annotations::CONTEXT_CLASS
         );
+        $expectedAnnotations->add(
+            'namespaced:tag',
+            'some argument',
+            Annotations::CONTEXT_CLASS
+        );
 
         $this->assertEquals($expectedAnnotations, $annotations);
     }