haml--haml/lib/sass/tree/mixin_def_node.rb

module Sass
  module Tree
    # A dynamic node representing a mixin definition.
    #
    # @see Sass::Tree
    class MixinDefNode < Node
      # @param name [String] The mixin name
      # @param args [Array<(Script::Node, Script::Node)>] The arguments for the mixin.
      #   Each element is a tuple containing the variable for argument
      #   and the parse tree for the default value of the argument
      def initialize(name, args)
        @name = name
        @args = args
        super()
      end

      # @see Node#to_sass
      def to_sass(tabs, opts = {})
        args =
          if @args.empty?
            ""
          else
            '(' + @args.map do |v, d|
              if d
                "#{v.to_sass} = #{d.to_sass}"
              else
                v.to_sass
              end
            end.join(", ") + ')'
          end
              
        "#{'  ' * tabs}=#{@name}#{args}\n" + children_to_sass(tabs, opts)
      end

      protected

      # Loads the mixin into the environment.
      #
      # @param environment [Sass::Environment] The lexical environment containing
      #   variable and mixin values
      def _perform(environment)
        environment.set_mixin(@name, Sass::Mixin.new(@name, @args, environment, children))
        []
      end
    end
  end
end