@marp-team/marpit/lib/markdown/heading_divider.js

The skinny framework for creating slide deck from Markdown

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _token = _interopRequireDefault(require("markdown-it/lib/token"));

var _split = _interopRequireDefault(require("../helpers/split"));

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

/** @module */

/**
 * Marpit heading divider plugin.
 *
 * Start a new slide page at before of headings by prepending hidden `<hr>`
 * elements.
 *
 * @alias module:markdown/heading_divider
 * @param {MarkdownIt} md markdown-it instance.
 * @param {Marpit} marpit Marpit instance.
 */
function headingDivider(md, marpit) {
  md.core.ruler.before('marpit_slide', 'marpit_heading_divider', state => {
    let target = marpit.options.headingDivider;
    if (marpit.lastGlobalDirectives && Object.prototype.hasOwnProperty.call(marpit.lastGlobalDirectives, 'headingDivider')) target = marpit.lastGlobalDirectives.headingDivider;
    if (state.inlineMode || target === false) return;
    if (Number.isInteger(target) && target >= 1 && target <= 6) target = [...Array(target).keys()].map(i => i + 1);
    if (!Array.isArray(target)) return;
    const splitTag = target.map(i => `h${i}`);

    const splitFunc = t => t.type === 'heading_open' && splitTag.includes(t.tag);

    const newTokens = [];

    for (const slideTokens of (0, _split.default)(state.tokens, splitFunc, true)) {
      const [token] = slideTokens;

      if (token && splitFunc(token) && newTokens.some(t => !t.hidden)) {
        const hr = new _token.default('hr', '', 0);
        hr.hidden = true;
        newTokens.push(hr);
      }

      newTokens.push(...slideTokens);
    }

    state.tokens = newTokens;
  });
}

var _default = headingDivider;
exports.default = _default;