-- See the Copyright notice at the end of this file.
--
class EXPAND_ALTERNATIVE

inherit
	ABSTRACT_BACKTRACKING_ALTERNATIVE
	EXPRESSION_ITEM_GLOBALS

feature {ABSTRACT_BACKTRACKING}
	next_alternative (explorer: EXPAND_EXPRESSION) is
		do
			explorer.stack.resize(count)
			if Iterate and then item.type = Or_item then
				explorer.goto_item(item.first)
				item := item.second
				explorer.continue_alternative
			else
				explorer.goto_item(item)
				explorer.pop_alternative
			end
		end

feature {}
	item: EXPRESSION_ITEM

	count: INTEGER

feature {EXPAND_EXPRESSION}
	make (itm: EXPRESSION_ITEM; cnt: INTEGER) is
		do
			count := cnt
			item := itm
		end

end -- class EXPAND_ALTERNATIVE
--
-- ------------------------------------------------------------------------------------------------------------------------------
-- Copyright notice below. Please read.
--
-- This file is free software, which comes along with SmartEiffel. This software 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.
-- You can modify it as you want, provided this footer is kept unaltered, and a notification of the changes is added.
-- You are allowed to redistribute it and sell it, alone or as a part of another product.
--
-- Copyright(C) 1994-2002: INRIA - LORIA (INRIA Lorraine) - ESIAL U.H.P.       - University of Nancy 1 - FRANCE
-- Copyright(C) 2003-2005: INRIA - LORIA (INRIA Lorraine) - I.U.T. Charlemagne - University of Nancy 2 - FRANCE
--
-- Authors: Dominique COLNET, Philippe RIBET, Cyril ADRIAN, Vincent CROIZIER, Frederic MERIZEN
--
-- http://SmartEiffel.loria.fr - SmartEiffel@loria.fr
-- ------------------------------------------------------------------------------------------------------------------------------