showdown-section-groups/lib/showdown-section-groups.js

A showdown extension that wraps headers and paragraphs in sections

(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(['exports', 'showdown'], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports, require('showdown'));
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports, global.showdown);
    global.showdownSectionGroups = mod.exports;
  }
})(this, function (exports, _showdown) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.default = showdownSectionGroups;

  var _showdown2 = _interopRequireDefault(_showdown);

  function _interopRequireDefault(obj) {
    return obj && obj.__esModule ? obj : {
      default: obj
    };
  }

  function showdownSectionGroups() {
    return {
      type: 'output',
      filter(html) {
        let outputString = '';
        let sectionOpen = false;
        let inHeader = false;
        let id = '';

        for (let i = 0; i < html.length; i += 1) {
          if (html.substring(i, i + 3).match(/<h\d/)) {
            inHeader = true;

            if (sectionOpen) {
              outputString += '</section>\n';
            }
          }

          if (inHeader && html.substring(i, i + 4).match(/id="/)) {
            [, id] = html.substring(i, html.length).match(/^id="(.*)"/);
          }

          if (html.substring(i - 5, i).match(/<\/h\d>/)) {
            outputString += `\n<section aria-labelledby="${id}">`;
            id = '';
            inHeader = false;
            sectionOpen = true;
          }

          outputString += html[i];
        }

        if (sectionOpen) {
          outputString += '\n</section>';
        }

        return outputString;
      }
    };
  }

  _showdown2.default.extension('section-groups', showdownSectionGroups);
});