grammar SQLSelect
  include SQLRowSupport

  include SQLSelectClause
  include SQLFromClause
  include SQLWhereCondition
  include SQLOrderByClause
  include SQLLimit
  include SQLHelpers

  rule select_expression
    select
    from 
    where_tree
    limit_condition_or_empty
    order_by_condition_or_empty
    {
      def eval
        SelectExpression.new({
          :string => self.text_value,

          :select => select.eval,
          :from   => from.eval,
          :where  => where_tree.where_condition_or_empty.eval,
          :limit  => limit_condition_or_empty.eval,
          :order_by => order_by_condition_or_empty.eval
        })
      end
      
      def query_type
        :select
      end
      
      def tree
        {
          :select => select.columns,
          :from   => from.tables,
          :where  => where_tree.eval,
          :limit  => limit_condition_or_empty.eval,
          :order_by => order_by_condition_or_empty.eval
        }
      end
    }
  end
end