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

The skinny framework for creating slide deck from Markdown

"use strict";

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

var _yaml = _interopRequireDefault(require("./directives/yaml"));

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

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

const commentMatcher = /<!--+\s*([\s\S]*?)\s*--+>/;
const commentMatcherOpening = /^<!--/;
const commentMatcherClosing = /-->/;
/**
 * Marpit comment plugin.
 *
 * Parse HTML comment as token. Comments will strip regardless of html setting
 * provided by markdown-it.
 *
 * @alias module:markdown/comment
 * @param {MarkdownIt} md markdown-it instance.
 * @param {Object} [opts]
 * @param {boolean} [opts.looseYAML=false] Allow loose YAML for directives.
 */

function comment(md, opts = {}) {
  const parse = (token, content) => {
    const parsed = (0, _yaml.default)(content, !!opts.looseYAML);
    token.meta = _objectSpread({}, token.meta || {}, {
      marpitParsedDirectives: parsed === false ? {} : parsed
    });
  };

  md.block.ruler.before('html_block', 'marpit_comment', (state, startLine, endLine, silent) => {
    // Fast fail
    let pos = state.bMarks[startLine] + state.tShift[startLine];
    if (state.src.charCodeAt(pos) !== 0x3c) return false;
    let max = state.eMarks[startLine];
    let line = state.src.slice(pos, max); // Match to opening element

    if (!commentMatcherOpening.test(line)) return false;
    if (silent) return true; // Parse ending element

    let nextLine = startLine + 1;

    if (!commentMatcherClosing.test(line)) {
      while (nextLine < endLine) {
        if (state.sCount[nextLine] < state.blkIndent) break;
        pos = state.bMarks[nextLine] + state.tShift[nextLine];
        max = state.eMarks[nextLine];
        line = state.src.slice(pos, max);
        nextLine += 1;
        if (commentMatcherClosing.test(line)) break;
      }
    }

    state.line = nextLine; // Create token

    const token = state.push('marpit_comment', '', 0);
    token.map = [startLine, nextLine];
    token.markup = state.getLines(startLine, nextLine, state.blkIndent, true);
    token.hidden = true;
    const matchedContent = commentMatcher.exec(token.markup);
    token.content = matchedContent ? matchedContent[1].trim() : '';
    parse(token, token.content);
    return true;
  });
  md.inline.ruler.before('html_inline', 'marpit_inline_comment', (state, silent) => {
    const {
      posMax,
      src
    } = state; // Quick fail by checking `<` and `!`

    if (state.pos + 2 >= posMax || src.charCodeAt(state.pos) !== 0x3c || src.charCodeAt(state.pos + 1) !== 0x21) return false;
    const match = src.slice(state.pos).match(commentMatcher);
    if (!match) return false;

    if (!silent) {
      const token = state.push('marpit_comment', '', 0);
      token.hidden = true;
      token.markup = src.slice(state.pos, state.pos + match[0].length);
      token.content = match[1].trim();
      parse(token, token.content);
    }

    state.pos += match[0].length;
    return true;
  });
}

var _default = comment;
exports.default = _default;