grammar.js

const services = require("./services");
// debugger;
module.exports = grammar({
  name: "gherkin",

  rules: {
    scene: ($) => seq($.given_statement, repeat1($.when_statement), repeat1($.then_statement)),

    and: ($) => "AND",
    but: ($) => "BUT",
    when: ($) => "WHEN",
    given: ($) => "GIVEN",
    then: ($) => "THEN",

    given_statement: ($) =>
      seq(
        seq($.given, $._service_description),
        optional(seq($.and, $._service_description)),
        optional(seq($.but, $._service_description))
      ),

    when_statement: ($) =>
      seq(
        seq($.when, $._api_description),
        optional(seq($.and, $._api_description)),
        optional(seq($.but, $._api_description))
      ),
    
    then_statement: ($) =>
      seq(
        seq($.then, $._action_names),
        optional(seq($.and, $._action_names)),
        optional(seq($.but, $._action_names))
      ),
    
    _action_names: ($) => choice('alert security', 'deny'),

    _service_description: ($) =>
      repeat1(choice($.service_name, choice($.service_name, $.word))),

    multiple_given_statements: ($) => seq($.given_statement),

    service_name: ($) => choice(...Object.values(services)),

    _api_call_name: $ => seq($.service_name, token.immediate(":"), field("api", $.word)),
    _api_description: ($) =>
      repeat1(choice($._api_call_name, choice($._api_call_name, $.word))),

    word: ($) => /\w+/,
  },
});