free_mutant/lib/mutant/mutator/literal.rb

module Mutant
  class Mutator
    # Abstract mutator for literal AST nodes
    class Literal < self

    private

      # Return new float literal
      #
      # @param [#to_f] value
      #
      # @return [Rubinius::Node::FloatLiteral]
      #
      # @api private
      #
      def new_float(value)
        new(Rubinius::AST::FloatLiteral, value)
      end

      # Return AST representing NaN
      #
      # @return [Rubinius::Node::AST]
      #
      # @api private
      #
      def nan
        new_send(new_float(0), :/, new_float(0))
      end

      # Return AST representing negative infinity
      #
      # @return [Rubinius::Node::AST]
      #
      # @api private
      #
      def negative_infinity
        new(Rubinius::AST::Negate, infinity)
      end

      # Return AST representing infinity
      #
      # @return [Rubinius::Node::AST]
      #
      # @api private
      #
      def infinity
        new_send(new_float(1), :/, new_float(0))
      end
    end
  end
end