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diff --git a/lib/parsetools/src/yeccscan.erl b/lib/parsetools/src/yeccscan.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(yeccscan).
+-export([scan/1, scan/3]).
+
+scan(Inport) ->
+ scan(Inport, '', 1).
+
+scan(Inport, Prompt, Line1) ->
+ case catch io:scan_erl_form(Inport, Prompt, Line1) of
+ {eof, Line2} ->
+ {eof, Line2};
+ {ok, Tokens, Line2} ->
+ case Tokens of
+ [] ->
+ scan(Inport, Prompt, Line2);
+ _ ->
+ {ok, lex(Tokens), Line2}
+ end;
+ {error, Descriptor, Line2} ->
+ {error, Descriptor, Line2};
+ {'EXIT', Why} ->
+ io:format('yeccscan: Error scanning input line ~w~n', [Line1]),
+ exit(Why)
+ end.
+
+lex([]) ->
+ [];
+lex([Token | Tokens]) ->
+ case Token of
+ {'dot', Line} ->
+ [{'dot', Line} | lex(Tokens)];
+ {':', Line} ->
+ [{':', Line} | lex(Tokens)];
+ {'->', Line} ->
+ [{'->', Line} | lex(Tokens)];
+ {Category, Line, Symbol} ->
+ [{Category, Line, Symbol} | lex(Tokens)];
+ {Other, Line} ->
+ Cat = case erl_scan:reserved_word(Other) of
+ true -> reserved_word;
+ false -> reserved_symbol
+ end,
+ [{Cat, Line, Other} | lex(Tokens)]
+ end.