module.exports = grammar(
{
  name: 'uci',

  extras: $ => [
    $.comment,
    /[\s\p{Zs}\uFEFF\u2060\u200B]/,
  ],

  rules: {
    config_file: $ => repeat(choice(
      $.package,
      $.config
    )),
    _name_fragment: $ => /[A-Za-z0-9_]+/,
    name: $ => choice(
      $._name_fragment,
      seq('"', $._name_fragment, '"'),
      seq("'", $._name_fragment, "'"),
    ),
    string: $ => choice(
      /"[^"\\]*"/,
      /'[^'\\]*'/,
      /[^'"\s]+/
    ),
    config: $ => seq(
      "config",
      field("type", $.name),
      optional(field("name", $.name)),
      repeat(choice($.option, $.list))
    ),
    package: $ => prec.right(seq(
      "package",
      $.name,
      repeat($.config)
    )),
    option: $ => seq(
      "option",
      field("key", $.name),
      field("value", $.string),
    ),
    list: $ => seq(
      "list",
      field("key", $.name),
      field("value", $.string),
    ),
    comment: $ => token(seq("#", /.*/))
  }
});