@gouvfr/dsfr-nexus/src/common/markdown/parse.js

Le module `dsfr-nexus` est l'interface de ligne de commande (CLI) centrale du Système de Design de l’État - DSFR. Il offre des outils pour gérer et compiler les ressources du DSFR

import { frontmatter } from 'micromark-extension-frontmatter';
import { directive } from 'micromark-extension-directive';
import { gfm } from 'micromark-extension-gfm';
import { frontmatterFromMarkdown } from 'mdast-util-frontmatter';
import { directiveFromMarkdown } from 'mdast-util-directive';
import { gfmFromMarkdown } from 'mdast-util-gfm';
import { fromMarkdown } from 'mdast-util-from-markdown';
import yaml from 'yaml';

const EXTENSIONS = [
  frontmatter(['yaml']),
  directive(),
  gfm(),
];
const MDAST_EXTENSIONS = [
  frontmatterFromMarkdown(['yaml']),
  directiveFromMarkdown(),
  gfmFromMarkdown(),
];

const OPTIONS = {
  extensions: EXTENSIONS,
  mdastExtensions: MDAST_EXTENSIONS
};

const parseMarkdown = (markdown) => {
  const mdast = fromMarkdown(markdown, OPTIONS);
  if (!mdast || !mdast.children || mdast.children.length === 0) {
    return [];
  }
  if (mdast.type === 'root') {
    return mdast.children[0].type === 'yaml' ? mdast.children.slice(1) : mdast.children;
  }
  return mdast.children;
};

const parseFrontMatter = (markdown) => {
  const mdast = fromMarkdown(markdown, OPTIONS);
  if (!mdast || !mdast.children || mdast.children.length === 0) {
    return null;
  }
  if (mdast.type === 'root') {
    const firstChild = mdast.children[0];
    if (firstChild.type === 'yaml') {
      return yaml.parse(firstChild.value);
    }
  }
  return null;
}

export { parseMarkdown, parseFrontMatter };