library markdown.util;

/// Replaces `<`, `&`, and `>`, with their HTML entity equivalents.
String escapeHtml(String html) {
  if (html == '' || html == null) return null;
  return html.replaceAll('&', '&amp;')
             .replaceAll('<', '&lt;')
             .replaceAll('>', '&gt;');
}

/// Removes null or empty values from [map].
void cleanMap(Map map) {
  map.keys
    .where((e) => isNullOrEmpty(map[e]))
    .toList()
    .forEach(map.remove);
}

/// Returns true if an object is null or an empty string.
bool isNullOrEmpty(object) {
  return object == null || object == '';
}