feat(zend): allow turbofish on attribute declarations

Signed-off-by: azjezz <azjezz@protonmail.com>

Author: azjezz

Zend/tests/generics/turbofish/turbofish_in_attribute.phpt

@@ -0,0 +1,39 @@
+--TEST--
+Turbofish: type arguments are accepted on attribute declarations
+--FILE--
+<?php
+
+// An event-listener attribute parameterised on the event type.
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class Listens<TEvent : object> {
+    public function __construct(public int $priority = 0) {}
+}
+
+class UserCreated {}
+class UserDeleted {}
+class OrderPlaced {}
+
+class EventListener {
+    #[Listens::<UserCreated>]
+    public function onUserCreated(object $event): void {}
+
+    #[Listens::<UserDeleted>()]
+    public function onUserDeleted(object $event): void {}
+
+    #[Listens::<OrderPlaced>(priority: -1)]
+    public function onOrderPlaced(object $event): void {}
+}
+
+$rc = new ReflectionClass(EventListener::class);
+foreach ($rc->getMethods() as $method) {
+    foreach ($method->getAttributes() as $attr) {
+        $instance = $attr->newInstance();
+        echo $method->getName(), ": #[", $attr->getName(),
+             "] priority=", $instance->priority, "\n";
+    }
+}
+?>
+--EXPECT--
+onUserCreated: #[Listens] priority=0
+onUserDeleted: #[Listens] priority=0
+onOrderPlaced: #[Listens] priority=-1

Zend/zend_language_parser.y

@@ -376,10 +376,16 @@ name:
 ;
 
 attribute_decl:
-		class_name
-			{ $$ = zend_ast_create(ZEND_AST_ATTRIBUTE, $1, NULL); }
-	|	class_name argument_list
-			{ $$ = zend_ast_create(ZEND_AST_ATTRIBUTE, $1, $2); }
+		class_name optional_call_type_argument_list
+			{
+				if ($2) zend_ast_destroy($2);
+				$$ = zend_ast_create(ZEND_AST_ATTRIBUTE, $1, NULL);
+			}
+	|	class_name optional_call_type_argument_list argument_list
+			{
+				if ($2) zend_ast_destroy($2);
+				$$ = zend_ast_create(ZEND_AST_ATTRIBUTE, $1, $3);
+			}
 ;
 
 attribute_group: