Method parse_function_signature

modules/gdscript/gdscript_parser.cpp:1585–1670

}

bool GDScriptParser::parse_function_signature(FunctionNode *p_function, SuiteNode *p_body, const String &p_type, int p_signature_start) {
	if (!check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE) && !is_at_end()) {
		bool default_used = false;
		do {
			if (check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE)) {
				// Allow for trailing comma.
				break;
			}

			bool is_rest = false;
			if (match(GDScriptTokenizer::Token::PERIOD_PERIOD_PERIOD)) {
				is_rest = true;
			}

			ParameterNode *parameter = parse_parameter();
			if (parameter == nullptr) {
				break;
			}

			if (p_function->is_vararg()) {
				push_error("Cannot have parameters after the rest parameter.");
				continue;
			}

			if (parameter->initializer != nullptr) {
				if (is_rest) {
					push_error("The rest parameter cannot have a default value.");
					continue;
				}
				default_used = true;
			} else {
				if (default_used && !is_rest) {
					push_error("Cannot have mandatory parameters after optional parameters.");
					continue;
				}
			}

			if (p_function->parameters_indices.has(parameter->identifier->name)) {
				push_error(vformat(R"(Parameter with name "%s" was already declared for this %s.)", parameter->identifier->name, p_type));
			} else if (is_rest) {
				p_function->rest_parameter = parameter;
				p_body->add_local(parameter, current_function);
			} else {
				p_function->parameters_indices[parameter->identifier->name] = p_function->parameters.size();
				p_function->parameters.push_back(parameter);
				p_body->add_local(parameter, current_function);
			}
		} while (match(GDScriptTokenizer::Token::COMMA));
	}

	pop_multiline();
	consume(GDScriptTokenizer::Token::PARENTHESIS_CLOSE, vformat(R"*(Expected closing ")" after %s parameters.)*", p_type));

	if (match(GDScriptTokenizer::Token::FORWARD_ARROW)) {
		make_completion_context(COMPLETION_TYPE_NAME_OR_VOID, p_function);
		p_function->return_type = parse_type(true);
		if (p_function->return_type == nullptr) {
			push_error(R"(Expected return type or "void" after "->".)");