Added naive word split example

sample/word_split.erl

@@ -0,0 +1,51 @@
+-module(word_split).
+-export([words/1, to_list/1]).
+
+
+% data WordState = {chunk, S} | {segment, L, C, R}
+
+nil() ->
+    nil.
+
+singleton(S) ->
+    {single, S}.
+
+conc(A, B) ->
+    {conc, A, B}.
+
+to_list(nil) ->
+    [];
+to_list({single, S}) ->
+    [S];
+to_list({conc, A, B}) ->
+    to_list(A) ++ to_list(B).
+
+maybe_word("") ->
+    nil();
+maybe_word(S) ->
+    singleton(S).
+
+process_char($ ) ->
+    {segment, "", nil(), ""};
+process_char(C) ->
+    {chunk, [C]}.
+
+combine({chunk, S1}, {chunk, S2}) ->
+    {chunk, S1 ++ S2};
+combine({chunk, S}, {segment, L, C, R}) ->
+    {segment, L ++ S, C, R};
+combine({segment, L, C, R}, {chunk, S}) ->
+    {segment, L, C, R ++ S};
+combine({segment, L1, C1, R1}, {segment, L2, C2, R2}) ->
+    {segment, L1, conc(C1, conc(maybe_word(R1 ++ L2), C2)), R2}.
+
+words([X|XS]) ->
+    T = lists:foldl(fun(A, B) -> combine(B, A) end, process_char(X),
+		    lists:map(fun(C) -> process_char(C) end, XS)),
+    case T of
+	{chunk, C} ->
+	    maybe_word(C);
+	{segment, L, C, R} ->
+	    conc(maybe_word(L), conc(C, maybe_word(R)))
+    end.
+