gherkin-lint/dist/rules/no-duplicate-tags.js

A Gherkin linter/validator written in javascript

"use strict";

const _ = require('lodash');

const rule = 'no-duplicate-tags';

function run(feature) {
  if (!feature) {
    return [];
  }

  let errors = [];
  verifyTags(feature, errors);
  feature.children.forEach(child => {
    if (child.scenario) {
      verifyTags(child.scenario, errors);
      child.scenario.examples.forEach(example => {
        verifyTags(example, errors);
      });
    }
  });
  return errors;
}

function verifyTags(node, errors) {
  const failedTagNames = [];
  const uniqueTagNames = [];
  node.tags.forEach(tag => {
    if (!_.includes(failedTagNames, tag.name)) {
      if (_.includes(uniqueTagNames, tag.name)) {
        errors.push({
          message: 'Duplicate tags are not allowed: ' + tag.name,
          rule: rule,
          line: tag.location.line
        });
        failedTagNames.push(tag.name);
      } else {
        uniqueTagNames.push(tag.name);
      }
    }
  });
}

module.exports = {
  name: rule,
  run: run
};