Function prerenderEmbed

src/core/render/embed.js:94–155

({ compiler, raw = '', fetch }, done)

}

export function prerenderEmbed({ compiler, raw = '', fetch }, done) {
  let hit = cached[raw];
  if (hit) {
    const copy = hit.slice();
    copy.links = hit.links;
    return done(copy);
  }

  const compile = compiler._marked;
  let tokens = compile.lexer(raw);
  const embedTokens = [];
  const linkRE = compile.Lexer.rules.inline.link;
  const links = tokens.links;

  tokens.forEach((token, index) => {
    if (token.type === 'paragraph') {
      token.text = token.text.replace(
        new RegExp(linkRE.source, 'g'),
        (src, filename, href, title) => {
          const embed = compiler.compileEmbed(href, title);

          if (embed) {
            embedTokens.push({
              index,
              embed,
            });
          }

          return src;
        }
      );
    }
  });

  // keep track of which tokens have been embedded so far
  // so that we know where to insert the embedded tokens as they
  // are returned
  const moves = [];
  walkFetchEmbed({ compile, embedTokens, fetch }, ({ embedToken, token }) => {
    if (token) {
      // iterate through the array of previously inserted tokens
      // to determine where the current embedded tokens should be inserted
      let index = token.index;
      moves.forEach(pos => {
        if (index > pos.start) {
          index += pos.length;
        }
      });

      merge(links, embedToken.links);

      tokens = tokens
        .slice(0, index)
        .concat(embedToken, tokens.slice(index + 1));
      moves.push({ start: index, length: embedToken.length - 1 });
    } else {
      cached[raw] = tokens.concat();
      tokens.links = cached[raw].links = links;