bubble_sort.erl

% Copyright (c) 2008 Ivan Fomichev
%
% Permission is hereby granted, free of charge, to any person obtaining a copy
% 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.

-module(bubble_sort).
-export([sort/1]).
-import(lists, [reverse/1]).

sort(L) -> sort(L, [], true).

sort([], L, true) -> reverse(L);

sort([], L, false) -> sort(reverse(L), [], true);

sort([ X, Y | T ], L, _) when X > Y ->
    sort([ X | T ], [ Y | L ], false);

sort([ X | T ], L, Halt) -> sort(T, [ X | L ], Halt).