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ebin | ||
erl_crash.dump |
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all: compile | ||
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compile: | ||
./rebar compile | ||
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clean: | ||
./rebar clean | ||
-rmdir ebin | ||
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veryclean: clean | ||
rm -rf rel | ||
rm -f erl_crash.dump | ||
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run: compile | ||
erl -pa ebin \ | ||
-boot start_sasl \ | ||
-run hop_demo start localhost |
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%% -*- erlang -*- | ||
{application, hop, | ||
[{description, "Hop"}, | ||
{vsn, "0.0.1"}, | ||
{registered, []}, | ||
{applications, [kernel, | ||
stdlib]}, | ||
{env, []}]}. |
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%% Copyright 2010, 2011, 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>. | ||
%% | ||
%% This file is part of Hop. | ||
%% | ||
%% Hop is free software: you can redistribute it and/or modify it | ||
%% under the terms of the GNU General Public License as published by | ||
%% the Free Software Foundation, either version 3 of the License, or | ||
%% (at your option) any later version. | ||
%% | ||
%% Hop is distributed in the hope that it will be useful, but WITHOUT | ||
%% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | ||
%% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | ||
%% License for more details. | ||
%% | ||
%% You should have received a copy of the GNU General Public License | ||
%% along with Hop. If not, see <http://www.gnu.org/licenses/>. | ||
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-module(sexp). | ||
%% SPKI SEXP. | ||
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-export([lex_state/0, lex/1, lex/2]). | ||
-export([parse_state/0, parse/1, parse/2]). | ||
-export([format/1, format_iolist/1]). | ||
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%% Lexer states | ||
-record(init, {}). | ||
-record(str, {remaining, pieces_rev}). | ||
-record(strlen, {value}). | ||
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%% Parser states | ||
-record(parser, {lexer, stack}). | ||
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-define(ZERO, 48). | ||
-define(NINE, 57). | ||
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lex_state() -> | ||
#init{}. | ||
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lex(Chunk) -> | ||
lex(Chunk, lex_state()). | ||
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lex(<<"(", Rest/binary>>, State = #init{}) -> | ||
{Events, FinalState} = lex(Rest, State), | ||
{[open | Events], FinalState}; | ||
lex(<<")", Rest/binary>>, State = #init{}) -> | ||
{Events, FinalState} = lex(Rest, State), | ||
{[close | Events], FinalState}; | ||
lex(<<"[", Rest/binary>>, State = #init{}) -> | ||
{Events, FinalState} = lex(Rest, State), | ||
{[hint_open | Events], FinalState}; | ||
lex(<<"]", Rest/binary>>, State = #init{}) -> | ||
{Events, FinalState} = lex(Rest, State), | ||
{[hint_close | Events], FinalState}; | ||
lex(<<D, Rest/binary>>, #init{}) when D >= ?ZERO andalso D =< ?NINE -> | ||
lex(Rest, #strlen{value = D - ?ZERO}); | ||
lex(<<X, Rest/binary>>, State = #init{}) when X =< 32 -> | ||
lex(Rest, State); | ||
lex(<<D, Rest/binary>>, #strlen{value = V}) when D >= ?ZERO andalso D =< ?NINE -> | ||
lex(Rest, #strlen{value = V * 10 + D - ?ZERO}); | ||
lex(<<":", Rest/binary>>, #strlen{value = V}) -> | ||
lex(Rest, #str{remaining = V, pieces_rev = []}); | ||
lex(Chunk, #str{remaining = Len, pieces_rev = PiecesRev}) -> | ||
case Chunk of | ||
<<Piece:Len/binary, Rest/binary>> -> | ||
{Events, FinalState} = lex(Rest, #init{}), | ||
{[{str, iolist_to_binary(lists:reverse([Piece | PiecesRev]))} | Events], FinalState}; | ||
_ -> | ||
{[], #str{remaining = Len - size(Chunk), pieces_rev = [Chunk | PiecesRev]}} | ||
end; | ||
lex(<<>>, State) -> | ||
{[], State}. | ||
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parse_state() -> | ||
#parser{lexer = lex_state(), stack = []}. | ||
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parse(Chunk) -> | ||
Inert = parse_state(), | ||
case parse(Chunk, Inert) of | ||
{Terms, Inert} -> {ok, Terms, Inert}; | ||
{Terms, Other} -> {more, Terms, Other} | ||
end. | ||
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parse(Chunk, #parser{lexer = Lexer, stack = Stack}) -> | ||
{Events, NewLexer} = lex(Chunk, Lexer), | ||
{Terms, NewStack} = parse_events(Events, Stack), | ||
{Terms, #parser{lexer = NewLexer, stack = NewStack}}. | ||
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parse_events([open | Rest], Stack) -> | ||
parse_events(Rest, [[] | Stack]); | ||
parse_events([close | Rest], [AccRev]) when is_list(AccRev) -> | ||
{Terms, NewStack} = parse_events(Rest, []), | ||
{[lists:reverse(AccRev) | Terms], NewStack}; | ||
parse_events([close | Rest], [AccRev, AccRevOuter | Stack]) when is_list(AccRev) -> | ||
parse_events(Rest, [[lists:reverse(AccRev) | AccRevOuter] | Stack]); | ||
parse_events([hint_open | Rest], Stack) -> | ||
parse_events(Rest, [hint | Stack]); | ||
parse_events([{str, Bin} | Rest], [hint | Stack]) -> | ||
parse_events(Rest, [{hint, Bin} | Stack]); | ||
parse_events([hint_close | Rest], Stack = [{hint, _} | _]) -> | ||
parse_events(Rest, Stack); | ||
parse_events([{str, BodyBin} | Rest], [{hint, HintBin} | Stack]) -> | ||
{Terms, NewStack} = parse_events(Rest, Stack), | ||
{[{HintBin, BodyBin} | Terms], NewStack}; | ||
parse_events([{str, Bin} | Rest], Stack = []) -> | ||
{Terms, NewStack} = parse_events(Rest, Stack), | ||
{[Bin | Terms], NewStack}; | ||
parse_events([{str, Bin} | Rest], [AccRev | Stack]) when is_list(AccRev) -> | ||
parse_events(Rest, [[Bin | AccRev] | Stack]); | ||
parse_events([], Stack) -> | ||
{[], Stack}. | ||
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format(Sexp) -> | ||
iolist_to_binary(format_iolist(Sexp)). | ||
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format_bin(Bin) -> [integer_to_list(size(Bin)), $:, Bin]. | ||
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format_iolist(Bin) when is_binary(Bin) -> | ||
format_bin(Bin); | ||
format_iolist({H, B}) when is_binary(H) andalso is_binary(B) -> | ||
[$[, format_bin(H), $], format_bin(B)]; | ||
format_iolist(Sexps) when is_list(Sexps) -> | ||
[$(, [format_iolist(Sexp) || Sexp <- Sexps], $)]. |