%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions 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, Reason} ->
{error, Reason};
{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.
