-- This file is part of a Liberty Eiffel library.
-- See the full copyright at the end.
--
class REGULAR_EXPRESSION_ITEM_RANGE
   --
   -- accept a character in a range
   --

inherit
   REGULAR_EXPRESSION_ITEM

create {ANY}
   make

feature {ANY}
   lower, upper: CHARACTER
         -- lower and upper range

   make (low, up: CHARACTER)
      do
         lower := low
         upper := up
      ensure
         definition: lower = low and upper = up
      end

   explore (matcher: BACKTRACKING_REGULAR_EXPRESSION)
      do
         if matcher.valid_last_character and then matcher.last_character.in_range(lower, upper) then
            matcher.advance
            matcher.continue
         else
            matcher.backtrack
         end
      end

end -- class REGULAR_EXPRESSION_ITEM_RANGE
--
-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
--
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-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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-- THE SOFTWARE.