-- This file is part of a Liberty Eiffel library.
-- See the full copyright at the end.
--
expanded class BACKTRACKING_REGULAR_EXPRESSION_PATTERN
   --
   -- Class for backtracking (compiled) regular expressions pattern.
   --

feature {ANY}
   group_count: INTEGER
         -- The count of groups of the regular expression.

   is_valid: BOOLEAN
         -- Is the current pattern valid?
      do
         Result := root /= Void
      end

feature {BACKTRACKING_REGULAR_EXPRESSION}
   root: BACKTRACKING_NODE
         -- The root item.

   substrings_names: BIJECTIVE_DICTIONARY[INTEGER, FIXED_STRING]

feature {BACKTRACKING_REGULAR_EXPRESSION_BUILDER}
   make (top: like root; grpcnt: INTEGER; subnames: like substrings_names)
         -- Initializing
      require
         top_not_void: top /= Void
         valid_group_count: grpcnt >= 0
         valid_subnames: subnames.for_all(agent (c, i: INTEGER; s: FIXED_STRING): BOOLEAN do Result := i.in_range(0, c) and then s /= Void end (grpcnt, ?, ?))
      do
         root := top
         group_count := grpcnt
         substrings_names := subnames
      ensure
         definition: root = top and group_count = grpcnt
         valid: is_valid
      end

end -- class BACKTRACKING_REGULAR_EXPRESSION_PATTERN
--
-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
--
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-- 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
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