function method

Functional function(String kind)

Implementation

Functional function(String kind) {
  Token name = consume(TokenType.IDENTIFIER, "Expect $kind name.");
  consume(TokenType.LEFT_PAREN, "Expect '(' after $kind name.");
  List<Token> parameters = [];
  Map<Token, Object?> namedParams = {};
  if (!check(TokenType.RIGHT_PAREN)) {
    do {
      if (check(TokenType.RIGHT_PAREN)) break;
      if (parameters.length >= 255) {
        error(peek(), "Can't have more than 255 parameters.");
      }

      if (match([TokenType.LEFT_BRACE])) {
        do {
          Token name =
              consume(TokenType.IDENTIFIER, "Expect argument name before :.");
          Expr? expr;
          if (match([TokenType.EQUAL])) {
            expr = expression();
          }
          namedParams.addAll({name: expr});
        } while (match([TokenType.COMMA]));
        consume(TokenType.RIGHT_BRACE, "Expect '}' after named arguments.");
      } else {
        parameters
            .add(consume(TokenType.IDENTIFIER, "Expect parameter name."));
      }
    } while (match([TokenType.COMMA]));
  }
  consume(TokenType.RIGHT_PAREN, "Expect ')' after parameters.");
  match([TokenType.ASYNC]);
  consume(TokenType.LEFT_BRACE, "Expect '{' before $kind body.");
  List<Stmt> body = block();
  return Functional(name, parameters, namedParams, body);
}