GDScript: Better handling of `@rpc` annotation and autocompletion

3 files changed, 42 insertions, 13 deletions

diff --git a/modules/gdscript/doc_classes/@GDScript.xml b/modules/gdscript/doc_classes/@GDScript.xml
index 026b603683..e05b17168d 100644
--- a/modules/gdscript/doc_classes/@GDScript.xml
+++ b/modules/gdscript/doc_classes/@GDScript.xml
@@ -576,10 +576,10 @@
 				@rpc
 				func fn(): pass
 
-				@rpc(any_peer, unreliable_ordered)
+				@rpc("any_peer", "unreliable_ordered")
 				func fn_update_pos(): pass
 
-				@rpc(authority, call_remote, unreliable, 0) # Equivalent to @rpc
+				@rpc("authority", "call_remote", "unreliable", 0) # Equivalent to @rpc
 				func fn_default(): pass
 				[/codeblock]
 			</description>
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index 12c10642ec..4e7d278aab 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -800,6 +800,15 @@ static void _find_annotation_arguments(const GDScriptParser::AnnotationNode *p_a
 			warning.insert_text = warning.display.quote(p_quote_style);
 			r_result.insert(warning.display, warning);
 		}
+	} else if (p_annotation->name == SNAME("@rpc")) {
+		if (p_argument == 0 || p_argument == 1 || p_argument == 2) {
+			static const char *options[7] = { "call_local", "call_remote", "any_peer", "authority", "reliable", "unreliable", "unreliable_ordered" };
+			for (int i = 0; i < 7; i++) {
+				ScriptLanguage::CodeCompletionOption option(options[i], ScriptLanguage::CODE_COMPLETION_KIND_PLAIN_TEXT);
+				option.insert_text = option.display.quote(p_quote_style);
+				r_result.insert(option.display, option);
+			}
+		}
 	}
 }
 
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index d99a2b86a2..7b81f938d6 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -3902,26 +3902,46 @@ bool GDScriptParser::rpc_annotation(const AnnotationNode *p_annotation, Node *p_
 			push_error(R"(Invalid RPC arguments. At most 4 arguments are allowed, where only the last argument can be an integer to specify the channel.')", p_annotation);
 			return false;
 		}
+
+		unsigned char locality_args = 0;
+		unsigned char permission_args = 0;
+		unsigned char transfer_mode_args = 0;
+
 		for (int i = last; i >= 0; i--) {
-			String mode = p_annotation->resolved_arguments[i].operator String();
-			if (mode == "any_peer") {
-				rpc_config["rpc_mode"] = MultiplayerAPI::RPC_MODE_ANY_PEER;
-			} else if (mode == "authority") {
-				rpc_config["rpc_mode"] = MultiplayerAPI::RPC_MODE_AUTHORITY;
-			} else if (mode == "call_local") {
+			String arg = p_annotation->resolved_arguments[i].operator String();
+			if (arg == "call_local") {
+				locality_args++;
 				rpc_config["call_local"] = true;
-			} else if (mode == "call_remote") {
+			} else if (arg == "call_remote") {
+				locality_args++;
 				rpc_config["call_local"] = false;
-			} else if (mode == "reliable") {
+			} else if (arg == "any_peer") {
+				permission_args++;
+				rpc_config["rpc_mode"] = MultiplayerAPI::RPC_MODE_ANY_PEER;
+			} else if (arg == "authority") {
+				permission_args++;
+				rpc_config["rpc_mode"] = MultiplayerAPI::RPC_MODE_AUTHORITY;
+			} else if (arg == "reliable") {
+				transfer_mode_args++;
 				rpc_config["transfer_mode"] = MultiplayerPeer::TRANSFER_MODE_RELIABLE;
-			} else if (mode == "unreliable") {
+			} else if (arg == "unreliable") {
+				transfer_mode_args++;
 				rpc_config["transfer_mode"] = MultiplayerPeer::TRANSFER_MODE_UNRELIABLE;
-			} else if (mode == "unreliable_ordered") {
+			} else if (arg == "unreliable_ordered") {
+				transfer_mode_args++;
 				rpc_config["transfer_mode"] = MultiplayerPeer::TRANSFER_MODE_UNRELIABLE_ORDERED;
 			} else {
-				push_error(R"(Invalid RPC argument. Must be one of: 'call_local'/'call_remote' (local calls), 'any_peer'/'authority' (permission), 'reliable'/'unreliable'/'unreliable_ordered' (transfer mode).)", p_annotation);
+				push_error(R"(Invalid RPC argument. Must be one of: "call_local"/"call_remote" (local calls), "any_peer"/"authority" (permission), "reliable"/"unreliable"/"unreliable_ordered" (transfer mode).)", p_annotation);
 			}
 		}
+
+		if (locality_args > 1) {
+			push_error(R"(Invalid RPC config. The locality ("call_local"/"call_remote") must be specified no more than once.)", p_annotation);
+		} else if (permission_args > 1) {
+			push_error(R"(Invalid RPC config. The permission ("any_peer"/"authority") must be specified no more than once.)", p_annotation);
+		} else if (transfer_mode_args > 1) {
+			push_error(R"(Invalid RPC config. The transfer mode ("reliable"/"unreliable"/"unreliable_ordered") must be specified no more than once.)", p_annotation);
+		}
 	}
 	function->rpc_config = rpc_config;
 	return true;