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

The skinny framework for creating slide deck from Markdown

"use strict";

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

/** @module */

/**
 * Marpit sweep plugin.
 *
 * Hide blank paragraphs. For better support of the background image syntax and
 * directives through HTML comment, Marpit will sweep paragraphs included only
 * whitespace by setting `hidden: true`.
 *
 * @alias module:markdown/sweep
 * @param {MarkdownIt} md markdown-it instance.
 */
function sweep(md) {
  md.core.ruler.after('inline', 'marpit_sweep', state => {
    if (state.inlineMode) return;

    for (const token of state.tokens) {
      if (token.type === 'html_block' && token.content.match(/^\s*$/) || token.type === 'inline' && token.children.filter(t => !(t.hidden || t.type === 'softbreak')).every(t => t.type === 'text' && t.content.match(/^\s*$/))) token.hidden = true;
    }
  });
  md.core.ruler.push('marpit_sweep_paragraph', state => {
    if (state.inlineMode) return;
    const current = {
      open: [],
      tokens: {}
    };

    for (const token of state.tokens) {
      if (token.type === 'paragraph_open') {
        current.open.push(token);
        current.tokens[token] = [];
      } else if (token.type === 'paragraph_close') {
        const openToken = current.open.pop();

        if (current.tokens[openToken].every(t => t.hidden)) {
          openToken.hidden = true;
          token.hidden = true;
        }
      } else {
        const len = current.open.length;
        if (len > 0) current.tokens[current.open[len - 1]].push(token);
      }
    }
  });
}

var _default = sweep;
exports.default = _default;