1 files changed, 62 insertions, 0 deletions
diff --git a/lib/parsetools/src/yeccscan.erl b/lib/parsetools/src/yeccscan.erl
new file mode 100644
index 0000000000..d7ec3ba8d3
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+++ b/lib/parsetools/src/yeccscan.erl
@@ -0,0 +1,62 @@
+%%
+%% %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.