class SyntaxTree::Mermaid::Link

def render
  left_side, right_side, full_side = sides
  if label
    escaped = Mermaid.escape(label)
    "#{from.id} #{left_side} #{escaped} #{right_side} #{to.id}"
  else
    "#{from.id} #{full_side} #{to.id}"
  end
end