Function topline

packages/ast/parse/combinators.js:21–27

(matcher)

};

const topline = (matcher) => (text, position) => {
  if (position > 0 && text.charAt(position - 1) !== '\n') {
    return null;
  }

  return matcher(text, position);
};

const deep = (type, callback) => (match, _, position) => {
  const [result, content] = match;