node.rb

module Liquidscript
  module AST
    class Node
      
      class << self
        
        # Define a child node for this node.  It accepts a name.
        #
        # @param name [Symbol] the name of the child.
        # @return [void]
        def child(name)
          children << name
          attr_accessor(name)
        end
        
        # Return an array of the children of this node.
        #
        # @return [Array<Symbol>]
        def children
          @_children ||= []
        end
        
      end
      
      # Return an array of all of the children of this node.
      #
      # @return [Array<Node>]
      def children
        self.class.children.map { |child| send(child) }
      end
      
    end
  end
end