Implement template default syntax

Author: rvanvelzen

src/Ast/PhpDoc/TemplateTagValueNode.php

@@ -17,21 +17,26 @@ class TemplateTagValueNode implements PhpDocTagValueNode
 	/** @var TypeNode|null */
 	public $bound;
 
+	/** @var TypeNode|null */
+	public $default;
+
 	/** @var string (may be empty) */
 	public $description;
 
-	public function __construct(string $name, ?TypeNode $bound, string $description)
+	public function __construct(string $name, ?TypeNode $bound, string $description, ?TypeNode $default = null)
 	{
 		$this->name = $name;
 		$this->bound = $bound;
+		$this->default = $default;
 		$this->description = $description;
 	}
 
 
 	public function __toString(): string
 	{
 		$bound = $this->bound !== null ? " of {$this->bound}" : '';
-		return trim("{$this->name}{$bound} {$this->description}");
+		$default = $this->default !== null ? " = {$this->default}" : '';
+		return trim("{$this->name}{$bound}{$default} {$this->description}");
 	}
 
 }

src/Parser/PhpDocParser.php

@@ -402,9 +402,15 @@ private function parseTemplateTagValue(TokenIterator $tokens): Ast\PhpDoc\Templa
 			$bound = null;
 		}
 
+		if ($tokens->tryConsumeTokenValue('=')) {
+			$default = $this->typeParser->parse($tokens);
+		} else {
+			$default = null;
+		}
+
 		$description = $this->parseOptionalDescription($tokens);
 
-		return new Ast\PhpDoc\TemplateTagValueNode($name, $bound, $description);
+		return new Ast\PhpDoc\TemplateTagValueNode($name, $bound, $description, $default);
 	}
 
 	private function parseExtendsTagValue(string $tagName, TokenIterator $tokens): Ast\PhpDoc\PhpDocTagValueNode

tests/PHPStan/Parser/PhpDocParserTest.php

@@ -3345,6 +3345,22 @@ public function provideTemplateTagsData(): Iterator
 				),
 			]),
 		];
+
+		yield [
+			'OK with default',
+			'/** @template T = string */',
+			new PhpDocNode([
+				new PhpDocTagNode(
+					'@template',
+					new TemplateTagValueNode(
+						'T',
+						null,
+						'',
+						new IdentifierTypeNode('string')
+					)
+				),
+			]),
+		];
 	}
 
 	public function provideExtendsTagsData(): Iterator