string_key field

[Xandaros]

A record_entry is:

    record_entry: $ => choice(
      seq(
        field("key", $.identifier),
        ":", field("type", $._type)
      ),
      seq(
        "[", field("string_key", $.string), "]",
        ":", field("type", $._type)
      ),
      // TODO: there has to be a way around doing this, but I can't figure it out
      ...[ "type", "record", "enum", "userdata", "metamethod" ].map((reserved_id) => seq(
        field("key", alias(reserved_id, $.identifier)),
        ":", field("type", $._type)
      )),
      seq(
        "type", field("key", $.identifier), "=", field("value", choice($._type, $._newtype))
      ),
      seq(
        "record",
        field("key", $.identifier),
        field("typeargs", optional($.typeargs)),
        field("value", $.record_body),
      ),
      seq(
        "enum", field("key", $.identifier),
        field("value", $.enum_body),
      ),
    ),

Notice how every one of them has a "key" field, except for the case where the key may contain spaces. Is there a reason for this? As far as I can tell, this just makes things more complicated. If you need to make sure whether it is a string key or not, you can check the node kind - in the string key case, it will be a string instead of an identifier.