@marp-team/marpit/lib/markdown/style/parse.js

The skinny framework for creating slide deck from Markdown

"use strict";

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

/** @module */
const styleMatcher = /<style[\s\S]*?>([\s\S]*?)<\/style>/i;
const styleMatcherOpening = /^<style(?=(\s|>|$))/i;
const styleMatcherClosing = /<\/style>/i;
/**
 * Marpit style parse plugin.
 *
 * Parse `<style>` elements as the hidden `marpit_style` token. The parsed style
 * will use in {@link ThemeSet#pack} to append the style additionally.
 *
 * `<style>` elements will strip regardless of html setting provided by
 * markdown-it.
 *
 * @alias module:markdown/style/parse
 * @param {MarkdownIt} md markdown-it instance.
 * @param {Marpit} marpit Marpit instance.
 */

function parse(md, marpit) {
  /**
   * Based on markdown-it html_block rule
   * https://github.com/markdown-it/markdown-it/blob/master/lib/rules_block/html_block.js
   */
  md.block.ruler.before('html_block', 'marpit_style_parse', (state, startLine, endLine, silent) => {
    if (!marpit.options.inlineStyle) return false; // 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 (!styleMatcherOpening.test(line)) return false;
    if (silent) return true; // Parse ending element

    let nextLine = startLine + 1;

    if (!styleMatcherClosing.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 (styleMatcherClosing.test(line)) break;
      }
    }

    state.line = nextLine; // Create token

    const token = state.push('marpit_style', '', 0);
    token.map = [startLine, nextLine];
    token.markup = state.getLines(startLine, nextLine, state.blkIndent, true);
    token.hidden = true;
    const matchedContent = styleMatcher.exec(token.markup);
    token.content = matchedContent ? matchedContent[1].trim() : '';
    return true;
  });
}

var _default = parse;
exports.default = _default;