Method get_function_signature

modules/gdscript/gdscript_analyzer.cpp:5750–5907

}

bool GDScriptAnalyzer::get_function_signature(GDScriptParser::Node *p_source, bool p_is_constructor, GDScriptParser::DataType p_base_type, const StringName &p_function, GDScriptParser::DataType &r_return_type, List<GDScriptParser::DataType> &r_par_types, int &r_default_arg_count, BitField<MethodFlags> &r_method_flags, StringName *r_native_class) {
	r_method_flags = METHOD_FLAGS_DEFAULT;
	r_default_arg_count = 0;
	if (r_native_class) {
		*r_native_class = StringName();
	}
	StringName function_name = p_function;

	bool was_enum = false;
	if (p_base_type.kind == GDScriptParser::DataType::ENUM) {
		was_enum = true;
		if (p_base_type.is_meta_type) {
			// Enum type can be treated as a dictionary value.
			p_base_type.kind = GDScriptParser::DataType::BUILTIN;
			p_base_type.is_meta_type = false;
		} else {
			push_error("Cannot call function on enum value.", p_source);
			return false;
		}
	}

	if (p_base_type.kind == GDScriptParser::DataType::BUILTIN) {
		// Construct a base type to get methods.
		Callable::CallError err;
		Variant dummy;
		Variant::construct(p_base_type.builtin_type, dummy, nullptr, 0, err);
		if (err.error != Callable::CallError::CALL_OK) {
			ERR_FAIL_V_MSG(false, "Could not construct base Variant type.");
		}
		List<MethodInfo> methods;
		dummy.get_method_list(&methods);

		for (const MethodInfo &E : methods) {
			if (E.name == p_function) {
				function_signature_from_info(E, r_return_type, r_par_types, r_default_arg_count, r_method_flags);
				// Cannot use non-const methods on enums.
				if (!r_method_flags.has_flag(METHOD_FLAG_STATIC) && was_enum && !(E.flags & METHOD_FLAG_CONST)) {
					push_error(vformat(R"*(Cannot call non-const Dictionary function "%s()" on enum "%s".)*", p_function, p_base_type.enum_type), p_source);
				}
				return true;
			}
		}

		return false;
	}

	StringName base_native = p_base_type.native_type;
	if (base_native != StringName()) {
		// Empty native class might happen in some Script implementations.
		// Just ignore it.
		if (!class_exists(base_native)) {
			push_error(vformat("Native class %s used in script doesn't exist or isn't exposed.", base_native), p_source);
			return false;
		} else if (p_is_constructor && ClassDB::is_abstract(base_native)) {
			if (p_base_type.kind == GDScriptParser::DataType::CLASS) {
				push_error(vformat(R"(Class "%s" cannot be constructed as it is based on abstract native class "%s".)", p_base_type.class_type->fqcn.get_file(), base_native), p_source);
			} else if (p_base_type.kind == GDScriptParser::DataType::SCRIPT) {
				push_error(vformat(R"(Script "%s" cannot be constructed as it is based on abstract native class "%s".)", p_base_type.script_path.get_file(), base_native), p_source);