require 'danica/operator/chained'

module Danica
  class Sum < Operator::Chained
    default_value :priority, 1

    def +(other)
      repack(other)
    end

    private

    def tex_symbol
      '+'
    end

    def chain_operation(a, b)
      a + b
    end

    alias_method :gnu_symbol, :tex_symbol

    def join_proc(symbol)
      proc do |_, value|
        value.is_a?(Negative) ? ' ' : " #{symbol} "
      end
    end
  end
end