-- This file is part of Liberty Eiffel.
--
-- Liberty Eiffel is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, version 3 of the License.
--
-- Liberty Eiffel is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with Liberty Eiffel.  If not, see <http://www.gnu.org/licenses/>.
--
class LIBERTY_INSPECT_SLICE

insert
   LIBERTY_POSITIONABLE
   LIBERTY_REACHABLE

create {LIBERTY_BUILDER_TOOLS, LIBERTY_INSPECT_SLICE}
   make

feature {ANY}
   lower, upper: LIBERTY_EXPRESSION

feature {LIBERTY_INSPECT_CLAUSE}
   specialized_in (a_type: LIBERTY_ACTUAL_TYPE): like Current is
      local
         l, u: LIBERTY_EXPRESSION
      do
         l := lower.specialized_in(a_type)
         if lower = upper then
            if l = lower then
               Result := Current
            else
               create Result.make(l, l, position)
            end
         else
            u := upper.specialized_in(a_type)
            if l = lower and then u = upper then
               Result := Current
            else
               create Result.make(l, u, position)
            end
         end
      end

feature {LIBERTY_REACHABLE, LIBERTY_REACHABLE_COLLECTION_MARKER}
   mark_reachable_code (mark: INTEGER) is
      do
         lower.mark_reachable_code(mark)
         if upper /= lower then
            upper.mark_reachable_code(mark)
         end
      end

feature {}
   make (a_lower: like lower; a_upper: like upper; a_position: like position) is
      require
         a_lower /= Void
         a_position /= Void
      do
         lower := a_lower
         if a_upper /= Void then
            upper := a_upper
         else
            upper := a_lower
         end
         position := a_position
      ensure
         lower = a_lower
         a_upper /= Void implies upper = a_upper
         a_upper = Void implies upper = a_lower
         position = a_position
      end

feature {ANY}
   accept (v: VISITOR) is
      local
         v0: LIBERTY_INSPECT_SLICE_VISITOR
      do
         v0 ::= v
         v0.visit_liberty_inspect_slice(Current)
      end

invariant
   lower /= Void
   upper /= Void

end