/// <reference types="tree-sitter-cli/dsl" />
// @ts-check

module.exports = grammar({
  name: "dql",

  extras: ($) => [/\s/, $.comment],

  rules: {
    source_file: ($) => repeat($._definition),

    _definition: ($) => choice($.block, $.identifier, $.string, $.number),

    block: ($) =>
      prec(1, seq(
        optional(field("name", $.identifier)),
        "{",
        repeat($._definition),
        "}"
      )),

    comment: ($) => token(seq("#", /.*/)),

    string: ($) =>
      token(
        seq(
          '"',
          repeat(
            choice(
              /[^"\\]/,
              seq("\\", /./),
            )
          ),
          '"'
        )
      ),

    number: ($) => token(choice(/\d+\.\d+/, /\d+/)),

    identifier: ($) => token(choice(
      seq("@", /[a-zA-Z_][a-zA-Z0-9_.:]*/),
      seq("$", /[a-zA-Z_][a-zA-Z0-9_]*/),
      /[a-zA-Z_][a-zA-Z0-9_.:]*/,
    )),
  },
});