class SyntaxTree::Mermaid::Node

to be passed around to #link methods to create links between nodes.
be used directly. It is the return value of the #node method, and is meant
This class represents a node in a flowchart. Unlike the Link class, it can

def bounds 

def bounds
  case shape
  when :circle
    %w[(( ))]
  when :rectangle
    ["[", "]"]
  when :rounded
    %w[( )]
  when :stadium
    ["([", "])"]
  end
end

def initialize(id, label, shape) 

def initialize(id, label, shape)
  raise unless SHAPES.include?(shape)
  @id = id
  @label = label
  @shape = shape
end

def render 

def render
  left_bound, right_bound = bounds
  "#{id}#{left_bound}#{Mermaid.escape(label)}#{right_bound}"
end