writeText method
      
void
writeText()
      
     
    
    
Implementation
void writeText() {
  if (pos == start) {
    return;
  }
  final text = source.substring(start, pos);
  _tree.add(Text(text));
  start = pos;
}
void writeText() {
  if (pos == start) {
    return;
  }
  final text = source.substring(start, pos);
  _tree.add(Text(text));
  start = pos;
}