module Arel
  module Predicates
    class Binary < Predicate
      def to_sql(formatter = nil)
        "#{operand1.to_sql} #{predicate_sql} #{operand1.format(operand2)}"
      end
    end

    class CompoundPredicate < Binary
      def to_sql(formatter = nil)
        "(#{operand1.to_sql(formatter)} #{predicate_sql} #{operand2.to_sql(formatter)})"
      end
    end

    class Or < CompoundPredicate
      def predicate_sql; "OR" end
    end

    class And < CompoundPredicate
      def predicate_sql; "AND" end
    end

    class Equality < Binary
      def predicate_sql
        operand2.equality_predicate_sql
      end
    end

    class Not < Binary
      def predicate_sql; '!=' end
    end

    class GreaterThanOrEqualTo < Binary
      def predicate_sql; '>=' end
    end

    class GreaterThan < Binary
      def predicate_sql; '>' end
    end

    class LessThanOrEqualTo < Binary
      def predicate_sql; '<=' end
    end

    class LessThan < Binary
      def predicate_sql; '<' end
    end

    class Match < Binary
      def predicate_sql; 'LIKE' end
    end

    class In < Binary
      def predicate_sql; operand2.inclusion_predicate_sql end
    end
  end
end