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WHY WONT IT PARSE THE LAST FUCKING BYTE AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

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This commit is contained in:
Peter Harpending 2025-10-10 23:21:49 -06:00
parent 69a89cf78e
commit fa16da8178
9 changed files with 1039 additions and 54 deletions
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1
.gitignore vendored
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@ -4,6 +4,7 @@ deps
*.beam *.beam
*.plt *.plt
*.swp *.swp
*.swo
erl_crash.dump erl_crash.dump
ebin/*.beam ebin/*.beam
doc/*.html doc/*.html

95
priv/default.css Normal file
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@ -0,0 +1,95 @@
/* color pallette */
* {
--white: #f7f8fb;
--lgray0: #f5fbfd;
--lgray1: #daddd6;
--lgray2: #d3d8d5;
--mgray1: #687864;
--dgreen1: #21341e;
--lgreen1: #e5eef2;
--black: #003d27;
--sans: Helvetica, Liberation Sans, FreeSans, Roboto, sans-serif;
--mono: Liberation Mono, FreeMono, Roboto Mono, monospace;
--fsdef: 12pt;
}
/* body */
body {
background: var(--white);
color: var(--dgray1);
font-size: var(--fsdef);
font-family: var(--sans);
margin: 0;
padding: 0;
line-height: 1.4;
}
.content {
max-width: 800px;
margin: 0 auto;
/*
background: #ff0;
*/
}
/* add some top padding to content */
.content-title {
text-align: center;
text-decoration: underline;
}
.content-body {
width: 100%;
margin: 0 auto;
/*
background: #f00;
*/
padding-left: 10px;
padding-right: 10px;
box-sizing: border-box;
}
/* element-specific styling */
a {
color: var(--mgray1);
}
#wfc-input {
font-family: var(--mono);
font-size: var(--fsdef);
background: var(--lgreen1);
width: 100%;
box-sizing: border-box;
border-radius: 6px;
border: 1px solid var(--lgray1);
padding: 5px;
}
#wfc-output {
background: var(--lgray0);
font-family: var(--mono);
font-size: var(--fsdef);
width: 100%;
resize: vertical;
box-sizing: border-box;
border-radius: 6px;
border: 1px solid var(--lgray1);
padding: 5px;
}

112
priv/index.html
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@ -1,12 +1,114 @@
<!DOCTYPE html> <!DOCTYPE html>
<html> <html lang="en">
<head> <head>
<meta charset="utf-8"> <meta charset="utf-8">
<title>FEWD Hello!</title> <title>WF Compiler Demo</title>
<script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script> <link rel="stylesheet" href="./default.css">
</head> </head>
<body> <body>
<h1 x-data = "{message: 'Hello, Alpine!'}" <div class="content">
x-text = "message"></h1> <h1 class="content-title">WFC Demo</h1>
<div class="content-body">
<textarea id="wfc-output"
disabled
></textarea>
<input autofocus id="wfc-input"></textarea>
<h2>Settings</h2>
<input type="checkbox" checked id="auto-resize-output">Auto-resize output</input> <br>
<input type="checkbox" checked id="auto-scroll" >Auto-scroll output to bottom</input>
</div>
</div>
<script>
let ielt = document.getElementById('wfc-input');
let oelt = document.getElementById('wfc-output');
let MAX_OELT_HEIGHT = 100;
function auto_resize_output() {
// if the user has manually resized their output, we do nothing
if (document.getElementById('auto-resize-output').checked) {
// resize it automagically up to 500px
if (oelt.scrollHeight < MAX_OELT_HEIGHT) {
oelt.style.height = String(oelt.scrollHeight) + 'px';
}
else {
oelt.style.height = String(MAX_OELT_HEIGHT) + 'px';
}
}
}
function auto_scroll_to_bottom() {
if (document.getElementById('auto-scroll').checked) {
// scroll to bottom
oelt.scrollTop = oelt.scrollHeight;
}
}
function on_server_return(x) {
console.log('on_server_return:', x);
}
function on_some_bullshit(x) {
console.log('on_some_bullshit:', x);
}
function fetch_wfcin(user_line) {
let req_body_obj = {wfcin: user_line};
// let req_body_str = JSON.stringify(req_body_obj, undefined, 4);
let req_body_str = JSON.stringify(req_body_obj);
let req_options = {method: 'POST',
headers: {'content-type': 'application/json'},
body: req_body_str};
let response_promise = fetch('/wfcin', req_options);
response_promise.then(on_server_return, on_some_bullshit);
// this is a promise for a response
//console.log(response_promise);
}
// when user hits any key
function on_input_key(evt) {
if (evt.key === 'Enter') {
// don't do default thing
evt.preventDefault();
// grab contents
let contents = ielt.value;
// if contents are nonempty
let nonempty_contents = contents.trim().length > 0;
if (nonempty_contents) {
// put in output
// if it's nonempty add a newline
if (oelt.value.length > 0) {
oelt.value += '\n';
}
oelt.value += '> ' + contents;
oelt.hidden = false;
// query backend for result
fetch_wfcin(contents.trim());
// clear input
ielt.value = '';
// auto-resize
auto_resize_output();
auto_scroll_to_bottom();
}
}
}
function main() {
ielt.addEventListener('keydown', on_input_key);
}
main();
</script>
</body> </body>
</html> </html>

56
priv/scratch.txt Normal file
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@ -0,0 +1,56 @@
/* header */
div#header {
background: var(--lgray2);
height: 50px;
width: 100%;
}
img#header-logo {
height: 40px;
margin-top: 5px;
margin-bottom: 5px;
margin-left: 5px;
}
.main {
padding-top: 20px;
}
.content-diagram {
max-width: 100%;
margin: 0 auto;
padding: 0 auto;
}
/* Pandoc makes some wacky choices with how it lays out code blocks
*
* this means all <code> blocks that do not have a <pre> block as an ancestor
*
* ie the `inline code`
*/
code:not(pre *) {
border-radius: 6px;
border: 1px solid var(--lgray1);
padding-left: 3px;
padding-right: 3px;
padding-top: 1px;
padding-bottom: 1px;
background: var(--lgreen1);
}
/* this is specifically for ```fenced blocks``` */
pre {
border-radius: 6px;
border: 1px solid var(--lgray1);
padding: 5px;
background: var(--lgreen1);
overflow: scroll;
}
/* All `unfenced` or ```fenced``` blocks */
code {
font-family: Liberation Mono, Roboto Mono, monospace;
color: var(--dgreen1);
}

77
src/fd_client.erl
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@ -28,6 +28,7 @@
%%% Type and Record Definitions %%% Type and Record Definitions
-include("http.hrl"). -include("http.hrl").
-include("$zx_include/zx_logger.hrl").
-record(s, {socket = none :: none | gen_tcp:socket(), -record(s, {socket = none :: none | gen_tcp:socket(),
@ -131,19 +132,24 @@ loop(Parent, Debug, State = #s{socket = Socket, next = Next}) ->
ok = inet:setopts(Socket, [{active, once}]), ok = inet:setopts(Socket, [{active, once}]),
receive receive
{tcp, Socket, Message} -> {tcp, Socket, Message} ->
%ok = io:format("~p received: ~tp~n", [self(), Message]), tell("~p Next = ~p", [?LINE, Next]),
Received = Received =
case Next of case Next of
none -> Message; none -> Message;
_ -> <<Next/binary, Message/binary>> _ -> <<Next/binary, Message/binary>>
end, end,
tell("qhl_parse(Socket, ~tp)", [Received]),
case qhl:parse(Socket, Received) of case qhl:parse(Socket, Received) of
{ok, Req, NewNext} -> {ok, Req, NewNext} ->
tell("qhl return: {ok, ~p, ~p}", [Req, NewNext]),
handle_request(Socket, Req), handle_request(Socket, Req),
NewState = State#s{next = NewNext}, NewState = State#s{next = NewNext},
loop(Parent, Debug, NewState); loop(Parent, Debug, NewState);
Error -> Error ->
io:format("~tp:~tp error: ~tp~n", [self(), ?LINE, Error]), %% should trigger bad request
io:format("~p QHL parse error: ~tp", [?LINE, Error]),
io:format("~p bad request:~n~ts", [?LINE, Received]),
http_err(Socket, 400),
gen_tcp:shutdown(Socket, read_write), gen_tcp:shutdown(Socket, read_write),
exit(normal) exit(normal)
end; end;
@ -155,18 +161,6 @@ loop(Parent, Debug, State = #s{socket = Socket, next = Next}) ->
Unexpected -> Unexpected ->
ok = io:format("~p Unexpected message: ~tp", [self(), Unexpected]), ok = io:format("~p Unexpected message: ~tp", [self(), Unexpected]),
loop(Parent, Debug, State) loop(Parent, Debug, State)
%{tcp, Socket, <<"bye\r\n">>} ->
% ok = io:format("~p Client saying goodbye. Bye!~n", [self()]),
% ok = gen_tcp:send(Socket, "Bye!\r\n"),
% ok = gen_tcp:shutdown(Socket, read_write),
% exit(normal);
%{relay, Sender, Message} when Sender == self() ->
% ok = gen_tcp:send(Socket, ["Message from YOU: ", Message]),
% loop(Parent, Debug, State);
%{relay, Sender, Message} ->
% From = io_lib:format("Message from ~tp: ", [Sender]),
% ok = gen_tcp:send(Socket, [From, Message]),
% loop(Parent, Debug, State);
end. end.
@ -224,12 +218,23 @@ system_replace_state(StateFun, State) ->
%%% http request handling %%% http request handling
handle_request(Sock, R = #request{method = M, path = P}) when M =/= undefined, P =/= undefined -> handle_request(Sock, R = #request{method = M, path = P}) when M =/= undefined, P =/= undefined ->
zx:tell("~p ~p ~ts", [self(), M, P]), tell("~p ~ts", [M, P]),
route(Sock, M, P, R). route(Sock, M, P, R).
route(Sock, get, <<"/">>, _) -> home(Sock); route(Sock, get, Route, _Request) ->
route(Sock, _, _, _) -> http_err(Sock, 404). case Route of
<<"/">> -> home(Sock);
<<"/default.css">> -> default_css(Sock);
_ -> http_err(Sock, 404)
end;
route(Sock, post, Route, Request) ->
case Route of
<<"/wfcin">> -> wfcin(Sock, Request);
_ -> http_err(Sock, 404)
end;
route(Sock, _, _, _) ->
http_err(Sock, 404).
home(Sock) -> home(Sock) ->
@ -240,13 +245,47 @@ home(Sock) ->
Resp = #response{headers = [{"content-type", "text/html"}], Resp = #response{headers = [{"content-type", "text/html"}],
body = Body}, body = Body},
respond(Sock, Resp); respond(Sock, Resp);
Error ->
tell("error: ~p~n", [self(), Error]),
http_err(Sock, 500)
end.
default_css(Sock) ->
%% fixme: cache
Path_IH = filename:join([zx:get_home(), "priv", "default.css"]),
case file:read_file(Path_IH) of
{ok, Body} ->
Resp = #response{headers = [{"content-type", "text/css"}],
body = Body},
respond(Sock, Resp);
Error -> Error ->
io:format("~p error: ~p~n", [self(), Error]), io:format("~p error: ~p~n", [self(), Error]),
http_err(Sock, 500) http_err(Sock, 500)
end. end.
http_err(_, _) -> wfcin(Sock, Request) ->
error(todo). tell("wfcin request: ~tp", [Request]),
http_err(Sock, 501).
%% FIXME
http_err(Sock, N) ->
Slogan = qhl:slogan(N),
Body = ["<!doctype html>"
"<html lang=\"en\">"
"<head>"
"<meta charset=\"utf-8\">"
"<title>QHL: ", integer_to_list(N), " ", Slogan, "</title>"
"</head>"
"<body>"
"<h1>"
"QHL: ", integer_to_list(N), " ", Slogan,
"</h1>"
"</body>"
"</html>"],
Resp = #response{code = N,
headers = [{"content/type", "text/html"}],
body = Body},
respond(Sock, Resp).
respond(Sock, Response) -> respond(Sock, Response) ->

28
src/fewd.erl
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@ -10,9 +10,9 @@
-license("BSD-2-Clause-FreeBSD"). -license("BSD-2-Clause-FreeBSD").
-export([listen/1, ignore/0]). -export([listen/1, ignore/0]).
-export([start/0, start/1]).
-export([start/2, stop/1]). -export([start/2, stop/1]).
-include("$zx_include/zx_logger.hrl").
-spec listen(PortNum) -> Result -spec listen(PortNum) -> Result
@ -35,28 +35,6 @@ ignore() ->
fd_client_man:ignore(). fd_client_man:ignore().
-spec start() -> ok.
%% @doc
%% Start the server in an "ignore" state.
start() ->
ok = application:ensure_started(sasl),
ok = application:start(fewd),
io:format("Starting...").
-spec start(PortNum) -> ok
when PortNum :: inet:port_number().
%% @doc
%% Start the server and begin listening immediately. Slightly more convenient when
%% playing around in the shell.
start(PortNum) ->
ok = start(),
ok = fd_client_man:listen(PortNum),
io:format("Startup complete, listening on ~w~n", [PortNum]).
-spec start(normal, term()) -> {ok, pid()}. -spec start(normal, term()) -> {ok, pid()}.
%% @private %% @private
%% Called by OTP to kick things off. This is for the use of the "application" part of %% Called by OTP to kick things off. This is for the use of the "application" part of
@ -64,7 +42,9 @@ start(PortNum) ->
%% See: http://erlang.org/doc/apps/kernel/application.html %% See: http://erlang.org/doc/apps/kernel/application.html
start(normal, _Args) -> start(normal, _Args) ->
fd_sup:start_link(). Result = fd_sup:start_link(),
ok = listen(8000),
Result.
-spec stop(term()) -> ok. -spec stop(term()) -> ok.

26
src/qhl.erl
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@ -49,52 +49,62 @@ parse(Socket, Received) ->
%% socket. %% socket.
parse(Socket, Received, M = #request{method = undefined}) -> parse(Socket, Received, M = #request{method = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_method(Socket, Received) of case read_method(Socket, Received) of
{ok, Method, Rest} -> parse(Socket, Rest, M#request{method = Method}); {ok, Method, Rest} -> parse(Socket, Rest, M#request{method = Method});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{path = undefined}) -> parse(Socket, Received, M = #request{path = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_path(Socket, Received) of case read_path(Socket, Received) of
{ok, Path, Rest} -> parse(Socket, Rest, M#request{path = Path}); {ok, Path, Rest} -> parse(Socket, Rest, M#request{path = Path});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{qargs = undefined}) -> parse(Socket, Received, M = #request{qargs = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_qargs(Socket, Received) of case read_qargs(Socket, Received) of
{ok, Qargs, Rest} -> parse(Socket, Rest, M#request{qargs = Qargs}); {ok, Qargs, Rest} -> parse(Socket, Rest, M#request{qargs = Qargs});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{fragment = undefined}) -> parse(Socket, Received, M = #request{fragment = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_fragment(Socket, Received) of case read_fragment(Socket, Received) of
{ok, Fragment, Rest} -> parse(Socket, Rest, M#request{fragment = Fragment}); {ok, Fragment, Rest} -> parse(Socket, Rest, M#request{fragment = Fragment});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{version = undefined}) -> parse(Socket, Received, M = #request{version = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_version(Socket, Received) of case read_version(Socket, Received) of
{ok, Version, Rest} -> parse(Socket, Rest, M#request{version = Version}); {ok, Version, Rest} -> parse(Socket, Rest, M#request{version = Version});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{headers = undefined}) -> parse(Socket, Received, M = #request{headers = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_headers(Socket, Received) of case read_headers(Socket, Received) of
{ok, Headers, Rest} -> parse(Socket, Rest, M#request{headers = Headers}); {ok, Headers, Rest} -> parse(Socket, Rest, M#request{headers = Headers});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{enctype = undefined}) -> parse(Socket, Received, M = #request{enctype = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_enctype(M) of case read_enctype(M) of
{ok, Enctype} -> parse(Socket, Received, M#request{enctype = Enctype}); {ok, Enctype} -> parse(Socket, Received, M#request{enctype = Enctype});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{cookies = undefined}) -> parse(Socket, Received, M = #request{cookies = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_cookies(M) of case read_cookies(M) of
{ok, Cookies} -> parse(Socket, Received, M#request{cookies = Cookies}); {ok, Cookies} -> parse(Socket, Received, M#request{cookies = Cookies});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{size = undefined}) -> parse(Socket, Received, M = #request{size = undefined}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_size(M) of case read_size(M) of
{ok, 0} -> {ok, M#request{size = 0}, none}; {ok, 0} -> {ok, M#request{size = 0}, none};
{ok, Size} -> parse(Socket, Received, M#request{size = Size}); {ok, Size} -> parse(Socket, Received, M#request{size = Size});
Error -> Error Error -> Error
end; end;
parse(Socket, Received, M = #request{method = get, body = undefined, size = Size}) -> parse(Socket, Received, M = #request{method = get, body = undefined, size = Size}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_body(Received, Size) of case read_body(Received, Size) of
{ok, Body} -> {ok, M#request{body = Body}, none}; {ok, Body} -> {ok, M#request{body = Body}, none};
{ok, Body, Next} -> {ok, M#request{body = Body}, Next}; {ok, Body, Next} -> {ok, M#request{body = Body}, Next};
@ -107,6 +117,7 @@ parse(Socket,
method = post, method = post,
enctype = urlencoded, enctype = urlencoded,
size = Size}) -> size = Size}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_body(Received, Size) of case read_body(Received, Size) of
{ok, Body} -> {ok, Body} ->
{ok, M#request{body = parts_to_map(posted(Body))}, none}; {ok, M#request{body = parts_to_map(posted(Body))}, none};
@ -130,6 +141,7 @@ parse(Socket,
method = post, method = post,
enctype = {multipart, Boundary}, enctype = {multipart, Boundary},
size = Size}) -> size = Size}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_multipart(Socket, Received, Boundary, Size) of case read_multipart(Socket, Received, Boundary, Size) of
{ok, Parts} -> {ok, M#request{body = parts_to_map(Parts)}, none}; {ok, Parts} -> {ok, M#request{body = parts_to_map(Parts)}, none};
{ok, Parts, Next} -> {ok, M#request{body = parts_to_map(Parts)}, Next}; {ok, Parts, Next} -> {ok, M#request{body = parts_to_map(Parts)}, Next};
@ -141,10 +153,12 @@ parse(Socket,
method = post, method = post,
enctype = json, enctype = json,
size = Size}) -> size = Size}) ->
io:format("~p parse(~p, ~p, ~p)~n", [?LINE, Socket, Received, M]),
case read_body(Received, Size) of case read_body(Received, Size) of
{ok, Body} -> read_json(M#request{body = Body}, none); {ok, Body} -> read_json(M#request{body = Body}, none);
{ok, Body, Next} -> read_json(M#request{body = Body}, Next); {ok, Body, Next} -> read_json(M#request{body = Body}, Next);
{incomplete, Body} -> {incomplete, Body} ->
io:format("~p {incomplete, ~p}~n", [?LINE, Body]),
case accumulate(Socket, M#request{body = Body}) of case accumulate(Socket, M#request{body = Body}) of
{ok, NewM = #request{body = NewBody}} -> {ok, NewM = #request{body = NewBody}} ->
read_json(NewM#request{body = NewBody}, none); read_json(NewM#request{body = NewBody}, none);
@ -514,6 +528,7 @@ read_size(#request{method = options}) ->
read_body(Received, Size) -> read_body(Received, Size) ->
io:format("~p read_body(~p, ~p)~n", [?LINE, Received, Size]),
case Received of case Received of
<<Bin:Size/binary>> -> <<Bin:Size/binary>> ->
{ok, Bin}; {ok, Bin};
@ -811,9 +826,11 @@ accumulate(Socket, M = #request{size = Size, body = Body}) ->
end. end.
accumulate(Socket, Remaining, Received) when Remaining > 0 -> accumulate(Socket, Remaining, Received) when Remaining > 0 ->
io:format("~p accumulate(~p, ~p, ~p)~n", [?LINE, Socket, Remaining, Received]),
ok = inet:setopts(Socket, [{active, once}]), ok = inet:setopts(Socket, [{active, once}]),
receive receive
{tcp, Socket, Bin} -> {tcp, Socket, Bin} ->
io:format("~p~n", [?LINE]),
Size = byte_size(Bin), Size = byte_size(Bin),
if if
Size == Remaining -> Size == Remaining ->
@ -828,10 +845,15 @@ accumulate(Socket, Remaining, Received) when Remaining > 0 ->
{ok, NewReceived, Next} {ok, NewReceived, Next}
end; end;
{tcp_closed, Socket} -> {tcp_closed, Socket} ->
io:format("~p~n", [?LINE]),
{error, tcp_closed}; {error, tcp_closed};
{tcp_error, Socket, Reason} -> {tcp_error, Socket, Reason} ->
{error, {tcp_error, Reason}} io:format("~p~n", [?LINE]),
after 3000 -> {error, {tcp_error, Reason}};
X ->
io:format("~p raseevd: ~p~n", [?LINE, X])
after 10_000 ->
io:format("~p~n", [?LINE]),
{error, timeout} {error, timeout}
end; end;
accumulate(_, 0, Received) -> accumulate(_, 0, Received) ->

4
src/wfc_parse.erl
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@ -1,4 +0,0 @@
-module(wfc_parse).
-export([
]).

694
src/zj.erl Normal file
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@ -0,0 +1,694 @@
%%% @doc
%%% ZJ: The tiny JSON parser
%%%
%%% This module exports four functions and accepts no options.
%%% @end
-module(zj).
-vsn("1.1.2").
-author("Craig Everett <zxq9@zxq9.com>").
-copyright("Craig Everett <zxq9@zxq9.com>").
-license("MIT").
-export([encode/1, decode/1,
binary_encode/1, binary_decode/1]).
-export_type([value/0, bin_value/0]).
-type value() :: string()
| number()
| true
| false
| undefined
| [value()]
| #{string() := value()}.
-type bin_value() :: binary()
| number()
| true
| false
| undefined
| [bin_value()]
| #{binary() := bin_value()}.
%%% Character constants
-define(BKSPC, 16#08).
-define(H_TAB, 16#09).
-define(NEW_L, 16#0A).
-define(FORMF, 16#0C).
-define(CAR_R, 16#0D).
-define(SPACE, 16#20).
%%% Interface Functions
-spec encode(term()) -> string().
%% @doc
%% Take any convertable Erlang term and convert it to a JSON string.
%%
%% As JSON can only satirically be referred to as "a serialization format", it is
%% almost impossible to map any interesting data between Erlang (or any other language)
%% and JSON. For example, tuples do not exist in JSON, so converting an Erlang tuple
%% turns it into a list (a JSON array). Atoms also do not exist, so atoms other than
%% the ternay logic values `true', `false' and `null' become strings (those three
%% remain as atoms, with the added detail that JSON `null' maps to Erlang
%% `undefined').
%%
%% Unless care is taken to pick types that JSON can accurately express (integers,
%% floats, strings, maps, lists, ternary logic atoms) it is not possible to guarantee
%% (or even reasonable to expect) that `Term == decode(encode(Term))' will be true.
%%
%% This function crashes when it fails. Things that will cause a crash are trying to
%% convert non-UTF-8 binaries to strings, use non-string values as object keys,
%% encode an unaligned bitstring, etc.
%%
%% Note that Erlang terms are converted as type primitives, meaning that compound
%% functional structures like GB-trees, dicts, sets, etc. will wind up having their
%% underlying structures converted as-is which is almost never what you want. It is
%% usually best to reduce compound values down to primitives (lists or maps) before
%% running encode.
%%
%% The only unsupported Erlang pritmitive is bitstrings. Care has NOT been taken to
%% ensure separation between actual binary data and binaries that are supposed to be
%% interpreted as strings. The same is true of deep list data: it just comes out raw
%% unless you flatten or convert it to a utf8 string with the unicode module.
%%
%% NOTE: If you need a serialization format that is less ambiguous and expresses more
%% types consider using BERT (language-independent implementations of Erlang external
%% binary format) instead: http://bert-rpc.org
encode(true) -> "true";
encode(false) -> "false";
encode(undefined) -> "null";
encode([]) -> "[]";
encode(T) when is_atom(T) -> quote(atom_to_list(T));
encode(T) when is_float(T) -> float_to_list(T);
encode(T) when is_integer(T) -> integer_to_list(T);
encode(T) when is_pid(T) -> quote(pid_to_list(T));
encode(T) when is_port(T) -> quote(port_to_list(T));
encode(T) when is_function(T) -> quote(erlang:fun_to_list(T));
encode(T) when is_reference(T) -> quote(ref_to_list(T));
encode(T) -> unicode:characters_to_list(encode_value(T)).
-spec decode(Stream) -> Result
when Stream :: unicode:chardata(),
Result :: {ok, value()}
| {error, Parsed, Remainder}
| {incomplete, Parsed, Remainder},
Parsed :: value(),
Remainder :: unicode:chardata()
| unicode:external_chardata()
| binary().
%% @doc
%% Take any IO data acceptable to the unicode module and return a parsed data structure.
%% In the event of a parsing error whatever part of the structure could be successfully
%% parsed will be returned along with the remainder of the string. Note that the string
%% remainder may have been changed to a different form by unicode:characters_to_list/1.
%% If the unicode library itself runs into a problem performing the initial conversion
%% its error return (`error' or `incomplete') will be returned directly.
decode(Stream) ->
case unicode:characters_to_list(Stream) of
E when is_tuple(E) -> E;
[16#FEFF | String] -> parse(seek(String));
String -> parse(seek(String))
end.
-spec binary_encode(term()) -> binary().
%% @doc
%% A strict encoding routine that works very similarly to `encode/1' but with a few
%% differences:
%% ```
%% - Lists and Strings are firmly separated:
%% ALL lists are lists of discrete values, never strings.
%% ALL binaries are always UTF-8 strings.
%% An Erlang string or io_list will be encoded as JSON array.
%% - This function generates a UTF-8 binary, not a list.
%% - The burden is on the user to ensure that io_lists are collapsed to unicode
%% binaries via `unicode:characters_to_binary/1' before passing in string values.
%% - Erlang strings (lists) are still accepted as map/object keys.
%% '''
%%
%% NOTE:
%% Most cases are better served by `encode/1', as most code deals in strings and not
%% arrays of integer values.
%%
%% Using this function requires a little bit more work up front (because ununified
%% io_list() data will always be interpreted as a JSON array), but provides a way to
%% reliably generate lists or strings in an unambiguous way in the special case where
%% your code is generating both strings and lists of integer values that may overlap
%% with valid UTF-8 codepoint values.
binary_encode(true) -> <<"true">>;
binary_encode(false) -> <<"false">>;
binary_encode(undefined) -> <<"null">>;
binary_encode(T) when is_atom(T) -> <<"\"", (atom_to_binary(T, utf8))/binary, "\"">>;
binary_encode(T) when is_float(T) -> float_to_binary(T);
binary_encode(T) when is_integer(T) -> integer_to_binary(T);
binary_encode(T) when is_pid(T) -> <<"\"", (list_to_binary(pid_to_list(T)))/binary, "\"">>;
binary_encode(T) when is_port(T) -> <<"\"", (list_to_binary(port_to_list(T)))/binary, "\"">>;
binary_encode(T) when is_function(T) -> <<"\"", (list_to_binary(erlang:fun_to_list(T)))/binary, "\"">>;
binary_encode(T) when is_reference(T) -> <<"\"", (list_to_binary(ref_to_list(T)))/binary, "\"">>;
binary_encode(T) -> unicode:characters_to_binary(b_encode_value(T)).
-spec binary_decode(Stream) -> Result
when Stream :: unicode:chardata(),
Result :: {ok, bin_value()}
| {error, Parsed, Remainder}
| {incomplete, Parsed, Remainder},
Parsed :: bin_value(),
Remainder :: binary().
%% @doc
%% Almost identical in behavior to `decode/1' except this returns strings as binaries
%% and arrays of integers as Erlang lists (which may also be valid strings if the
%% values are valid UTF-8 codepoints).
%%
%% NOTE:
%% This function returns map keys as binaries
binary_decode(Stream) ->
case b_decode(Stream) of
{error, Part, Rest} -> {error, Part, unicode:characters_to_binary(Rest)};
Result -> Result
end.
%%% Encoding Functions
encode_value(true) -> "true";
encode_value(false) -> "false";
encode_value(undefined) -> "null";
encode_value(T) when is_atom(T) -> quote(atom_to_list(T));
encode_value(T) when is_float(T) -> float_to_list(T);
encode_value(T) when is_integer(T) -> integer_to_list(T);
encode_value(T) when is_binary(T) -> maybe_string(T);
encode_value(T) when is_list(T) -> maybe_array(T);
encode_value(T) when is_map(T) -> pack_object(T);
encode_value(T) when is_tuple(T) -> pack_array(tuple_to_list(T));
encode_value(T) when is_pid(T) -> quote(pid_to_list(T));
encode_value(T) when is_port(T) -> quote(port_to_list(T));
encode_value(T) when is_function(T) -> quote(erlang:fun_to_list(T));
encode_value(T) when is_reference(T) -> quote(ref_to_list(T)).
maybe_string(T) ->
L = binary_to_list(T),
true = io_lib:printable_unicode_list(L),
quote(L).
maybe_array(T) ->
case io_lib:printable_unicode_list(T) of
true -> quote(T);
false -> pack_array(T)
end.
quote(T) -> [$" | escape(T)].
escape([]) -> [$"];
escape([$\b | T]) -> [$\\, $b | escape(T)];
escape([$\f | T]) -> [$\\, $f | escape(T)];
escape([$\n | T]) -> [$\\, $n | escape(T)];
escape([$\r | T]) -> [$\\, $r | escape(T)];
escape([$\t | T]) -> [$\\, $t | escape(T)];
escape([$\" | T]) -> [$\\, $" | escape(T)];
escape([$\\ | T]) -> [$\\, $\\ | escape(T)];
escape([H | T]) -> [H | escape(T)].
pack_array([]) -> "[]";
pack_array([H | []]) -> [$[, encode_value(H), $]];
pack_array([H | T]) -> [$[, encode_value(H), $,, encode_array(T), $]].
encode_array([H | []]) -> encode_value(H);
encode_array([H | T]) -> [encode_value(H), $,, encode_array(T)].
pack_object(M) ->
case maps:to_list(M) of
[] ->
"{}";
[{K, V} | T] when is_list(K) ->
true = io_lib:printable_unicode_list(K),
Init = [$", K, $", $:, encode_value(V)],
[${, lists:foldl(fun pack_object/2, Init, T), $}];
[{K, V} | T] when is_binary(K) ->
Key = unicode:characters_to_list(K),
true = io_lib:printable_unicode_list(Key),
Init = [$", Key, $", $:, encode_value(V)],
[${, lists:foldl(fun pack_object/2, Init, T), $}];
[{K, V} | T] when is_float(K) ->
Key = float_to_list(K),
Init = [$", Key, $", $:, encode_value(V)],
[${, lists:foldl(fun pack_object/2, Init, T), $}];
[{K, V} | T] when is_integer(K) ->
Key = integer_to_list(K),
Init = [$", Key, $", $:, encode_value(V)],
[${, lists:foldl(fun pack_object/2, Init, T), $}];
[{K, V} | T] when is_atom(K) ->
Init = [$", atom_to_list(K), $", $:, encode_value(V)],
[${, lists:foldl(fun pack_object/2, Init, T), $}]
end.
pack_object({K, V}, L) when is_list(K) ->
true = io_lib:printable_unicode_list(K),
[$", K, $", $:, encode_value(V), $, | L];
pack_object({K, V}, L) when is_binary(K) ->
Key = unicode:characters_to_list(K),
true = io_lib:printable_unicode_list(Key),
[$", Key, $", $:, encode_value(V), $, | L];
pack_object({K, V}, L) when is_float(K) ->
Key = float_to_list(K),
[$", Key, $", $:, encode_value(V), $, | L];
pack_object({K, V}, L) when is_integer(K) ->
Key = integer_to_list(K),
[$", Key, $", $:, encode_value(V), $, | L];
pack_object({K, V}, L) when is_atom(K) ->
[$", atom_to_list(K), $", $:, encode_value(V), $, | L].
b_encode_value(true) -> <<"true">>;
b_encode_value(false) -> <<"false">>;
b_encode_value(undefined) -> <<"null">>;
b_encode_value(T) when is_atom(T) -> [$", atom_to_binary(T, utf8), $"];
b_encode_value(T) when is_float(T) -> float_to_binary(T);
b_encode_value(T) when is_integer(T) -> integer_to_binary(T);
b_encode_value(T) when is_binary(T) -> [$", b_maybe_string(T), $"];
b_encode_value(T) when is_list(T) -> b_pack_array(T);
b_encode_value(T) when is_map(T) -> b_pack_object(T);
b_encode_value(T) when is_tuple(T) -> b_pack_array(tuple_to_list(T));
b_encode_value(T) when is_pid(T) -> [$", list_to_binary(pid_to_list(T)), $"];
b_encode_value(T) when is_port(T) -> [$", list_to_binary(port_to_list(T)), $"];
b_encode_value(T) when is_function(T) -> [$", list_to_binary(erlang:fun_to_list(T)), $"];
b_encode_value(T) when is_reference(T) -> [$", list_to_binary(ref_to_list(T)), $"].
b_maybe_string(T) ->
S = unicode:characters_to_binary(T),
true = is_binary(S),
S.
b_pack_array([]) -> "[]";
b_pack_array([H | []]) -> [$[, b_encode_value(H), $]];
b_pack_array([H | T]) -> [$[, b_encode_value(H), $,, b_encode_array(T), $]].
b_encode_array([H | []]) -> b_encode_value(H);
b_encode_array([H | T]) -> [b_encode_value(H), $,, b_encode_array(T)].
b_pack_object(M) ->
case maps:to_list(M) of
[] ->
"{}";
[{K, V} | T] when is_list(K) ->
true = io_lib:printable_unicode_list(K),
Init = [$", K, $", $:, b_encode_value(V)],
[${, lists:foldl(fun b_pack_object/2, Init, T), $}];
[{K, V} | T] when is_binary(K) ->
true = io_lib:printable_unicode_list(unicode:characters_to_list(K)),
Init = [$", K, $", $:, b_encode_value(V)],
[${, lists:foldl(fun b_pack_object/2, Init, T), $}];
[{K, V} | T] when is_float(K) ->
Key = float_to_list(K),
Init = [$", Key, $", $:, b_encode_value(V)],
[${, lists:foldl(fun b_pack_object/2, Init, T), $}];
[{K, V} | T] when is_integer(K) ->
Key = integer_to_list(K),
Init = [$", Key, $", $:, b_encode_value(V)],
[${, lists:foldl(fun b_pack_object/2, Init, T), $}];
[{K, V} | T] when is_atom(K) ->
Init = [$", atom_to_binary(K, utf8), $", $:, b_encode_value(V)],
[${, lists:foldl(fun b_pack_object/2, Init, T), $}]
end.
b_pack_object({K, V}, L) when is_list(K) ->
true = io_lib:printable_unicode_list(K),
[$", K, $", $:, b_encode_value(V), $, | L];
b_pack_object({K, V}, L) when is_binary(K) ->
true = io_lib:printable_unicode_list(unicode:characters_to_list(K)),
[$", K, $", $:, b_encode_value(V), $, | L];
b_pack_object({K, V}, L) when is_float(K) ->
Key = float_to_list(K),
[$", Key, $", $:, b_encode_value(V), $, | L];
b_pack_object({K, V}, L) when is_integer(K) ->
Key = integer_to_list(K),
[$", Key, $", $:, b_encode_value(V), $, | L];
b_pack_object({K, V}, L) when is_atom(K) ->
[$", atom_to_list(K), $", $:, b_encode_value(V), $, | L].
%%% Decode Functions
-spec parse(Stream) -> Result
when Stream :: string(),
Result :: {ok, value()}
| {error, Extracted :: value(), Remaining :: string()}.
%% @private
%% The top-level dispatcher. This packages the top level value (or top-level error)
%% for return to the caller. A very similar function (value/1) is used for inner
%% values.
parse([${ | Rest]) ->
case object(Rest) of
{ok, Object, ""} -> {ok, Object};
{ok, Object, More} -> polish(Object, seek(More));
Error -> Error
end;
parse([$[ | Rest]) ->
case array(Rest) of
{ok, Array, ""} -> {ok, Array};
{ok, Array, More} -> polish(Array, seek(More));
Error -> Error
end;
parse([$" | Rest]) ->
case string(Rest) of
{ok, String, ""} -> {ok, String};
{ok, String, More} -> polish(String, seek(More));
Error -> Error
end;
parse([I | Rest]) when I == $-; $0 =< I, I =< $9 ->
case number_int(Rest, [I]) of
{ok, Number, ""} -> {ok, Number};
{ok, Number, More} -> polish(Number, seek(More));
Error -> Error
end;
parse("true" ++ More) ->
polish(true, seek(More));
parse("false" ++ More) ->
polish(false, seek(More));
parse("null" ++ More) ->
polish(undefined, seek(More));
parse(Other) ->
{error, [], Other}.
polish(Value, "") -> {ok, Value};
polish(Value, More) -> {error, Value, More}.
value([${ | Rest]) -> object(Rest);
value([$[ | Rest]) -> array(Rest);
value([$" | Rest]) -> string(Rest);
value([I | Rest]) when I == $-; $0 =< I, I =< $9 -> number_int(Rest, [I]);
value("true" ++ Rest) -> {ok, true, Rest};
value("false" ++ Rest) -> {ok, false, Rest};
value("null" ++ Rest) -> {ok, undefined, Rest};
value(_) -> error.
object([$} | Rest]) -> {ok, #{}, Rest};
object(String) -> object(seek(String), #{}).
object([$} | Rest], Map) ->
{ok, Map, Rest};
object([$" | Rest], Map) ->
case string(Rest) of
{ok, Key, Remainder} -> object_value(seek(Remainder), Key, Map);
{error, _, _} -> {error, Map, Rest}
end;
object(Rest, Map) ->
{error, Map, Rest}.
object_value([$: | Rest], Key, Map) ->
object_value_parse(seek(Rest), Key, Map);
object_value(Rest, Key, Map) ->
{error, maps:put(Key, undefined, Map), Rest}.
object_value_parse(String, Key, Map) ->
case value(String) of
{ok, Value, Rest} -> object_next(seek(Rest), maps:put(Key, Value, Map));
{error, Value, Rest} -> {error, maps:put(Key, Value, Map), Rest};
error -> {error, Map, String}
end.
object_next([$, | Rest], Map) -> object(seek(Rest), Map);
object_next([$} | Rest], Map) -> {ok, Map, seek(Rest)};
object_next(Rest, Map) -> {error, Map, Rest}.
array([$] | Rest]) -> {ok, [], Rest};
array(String) -> array(seek(String), []).
array([$] | Rest], List) ->
{ok, lists:reverse(List), seek(Rest)};
array(String, List) ->
case value(String) of
{ok, Value, Rest} -> array_next(seek(Rest), [Value | List]);
{error, Value, Rest} -> {error, lists:reverse([Value | List]), Rest};
error -> {error, lists:reverse(List), String}
end.
array_next([$, | Rest], List) -> array(seek(Rest), List);
array_next([$] | Rest], List) -> {ok, lists:reverse(List), seek(Rest)};
array_next(Rest, List) -> {error, lists:reverse(List), Rest}.
string(Stream) -> string(Stream, "").
string([$" | Rest], String) ->
{ok, lists:reverse(String), Rest};
string([$\\, $" | Rest], String) ->
string(Rest, [$" | String]);
string([$\\, $\\ | Rest], String) ->
string(Rest, [$\\ | String]);
string([$\\, $b | Rest], String) ->
string(Rest, [?BKSPC | String]);
string([$\\, $t | Rest], String) ->
string(Rest, [?H_TAB | String]);
string([$\\, $n | Rest], String) ->
string(Rest, [?NEW_L | String]);
string([$\\, $f | Rest], String) ->
string(Rest, [?FORMF | String]);
string([$\\, $r | Rest], String) ->
string(Rest, [?CAR_R | String]);
string([$\\, $u, A, B, C, D | Rest], String)
when (($0 =< A andalso A =< $9) or ($A =< A andalso A =< $F) or ($a =< A andalso A =< $f))
and (($0 =< B andalso B =< $9) or ($A =< B andalso B =< $F) or ($a =< B andalso B =< $f))
and (($0 =< C andalso C =< $9) or ($A =< C andalso C =< $F) or ($a =< C andalso C =< $f))
and (($0 =< D andalso D =< $9) or ($A =< D andalso D =< $F) or ($a =< D andalso D =< $f)) ->
Char = list_to_integer([A, B, C, D], 16),
string(Rest, [Char | String]);
string(Stream = [$\\, $u | _], String) ->
{error, String, Stream};
string([$\\, Char | Rest], String)
when Char == 16#20;
Char == 16#21;
16#23 =< Char, Char =< 16#5B;
16#5D =< Char, Char =< 16#10FFFF ->
string(Rest, [$\\, Char | String]);
string([Char | Rest], String)
when Char == 16#20;
Char == 16#21;
16#23 =< Char, Char =< 16#5B;
16#5D =< Char, Char =< 16#10FFFF ->
string(Rest, [Char | String]);
string(Rest, String) ->
{error, lists:reverse(String), Rest}.
number_int([$. | Rest], String) ->
number_float(Rest, [$. | String]);
number_int([$e, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e, $0, $. | String]);
number_int([$E, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e, $0, $. | String]);
number_int([$e, $+, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e, $0, $. | String]);
number_int([$E, $+, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e, $0, $. | String]);
number_int([$e, $-, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $-, $e, $0, $. | String]);
number_int([$E, $-, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $-, $e, $0, $. | String]);
number_int([Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_int(Rest, [Char | String]);
number_int(Rest, "-") ->
{error, "", [$- | Rest]};
number_int(Rest, String) ->
{ok, list_to_integer(lists:reverse(String)), seek(Rest)}.
number_float([Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float(Rest, [Char | String]);
number_float([$E, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e | String]);
number_float([$e, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e | String]);
number_float([$E, $+, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e | String]);
number_float([$e, $+, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $+, $e | String]);
number_float([$E, $-, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $-, $e | String]);
number_float([$e, $-, Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char, $-, $e | String]);
number_float(Rest, String) ->
Target = lists:reverse(String),
try
Number = list_to_float(Target),
{ok, Number, seek(Rest)}
catch
error:badarg -> {error, "", Target ++ Rest}
end.
number_float_exp([Char | Rest], String) when $0 =< Char, Char =< $9 ->
number_float_exp(Rest, [Char | String]);
number_float_exp(Rest, String) ->
Target = lists:reverse(String),
try
Number = list_to_float(Target),
{ok, Number, seek(Rest)}
catch
error:badarg -> {error, "", Target ++ Rest}
end.
seek([?H_TAB | Rest]) -> seek(Rest);
seek([?NEW_L | Rest]) -> seek(Rest);
seek([?CAR_R | Rest]) -> seek(Rest);
seek([?SPACE | Rest]) -> seek(Rest);
seek(String) -> String.
b_decode(Stream) ->
case unicode:characters_to_list(Stream) of
E when is_tuple(E) -> E;
[16#FEFF | String] -> binary_parse(seek(String));
String -> binary_parse(seek(String))
end.
-spec binary_parse(Stream) -> Result
when Stream :: string(),
Result :: {ok, bin_value()}
| {error, Extracted :: bin_value(), Remaining :: binary()}.
%% @private
%% The top-level dispatcher. This packages the top level value (or top-level error)
%% for return to the caller. A very similar function (b_value/1) is used for inner
%% values.
binary_parse([${ | Rest]) ->
case b_object(Rest) of
{ok, Object, ""} -> {ok, Object};
{ok, Object, More} -> b_polish(Object, seek(More));
Error -> Error
end;
binary_parse([$[ | Rest]) ->
case b_array(Rest) of
{ok, Array, ""} -> {ok, Array};
{ok, Array, More} -> b_polish(Array, seek(More));
Error -> Error
end;
binary_parse([$" | Rest]) ->
case string(Rest) of
{ok, String, ""} ->
case unicode:characters_to_binary(String) of
E when is_tuple(E) -> E;
Result -> {ok, Result}
end;
{ok, String, More} ->
case unicode:characters_to_binary(String) of
E when is_tuple(E) -> E;
Result -> b_polish(Result, seek(More))
end;
Error ->
Error
end;
binary_parse([I | Rest]) when I == $-; $0 =< I, I =< $9 ->
case number_int(Rest, [I]) of
{ok, Number, ""} -> {ok, Number};
{ok, Number, More} -> b_polish(Number, seek(More));
Error -> Error
end;
binary_parse("true" ++ More) ->
b_polish(true, seek(More));
binary_parse("false" ++ More) ->
b_polish(false, seek(More));
binary_parse("null" ++ More) ->
b_polish(undefined, seek(More));
binary_parse(Other) ->
{error, [], Other}.
b_polish(Value, "") -> {ok, Value};
b_polish(Value, More) -> {error, Value, More}.
b_value([${ | Rest]) -> b_object(Rest);
b_value([$[ | Rest]) -> b_array(Rest);
b_value([$" | Rest]) -> b_string(Rest);
b_value([I | Rest]) when I == $-; $0 =< I, I =< $9 -> number_int(Rest, [I]);
b_value("true" ++ Rest) -> {ok, true, Rest};
b_value("false" ++ Rest) -> {ok, false, Rest};
b_value("null" ++ Rest) -> {ok, undefined, Rest};
b_value(_) -> error.
b_string(Stream) ->
case string(Stream) of
{ok, String, More} ->
case unicode:characters_to_binary(String) of
E when is_tuple(E) -> E;
Result -> {ok, Result, More}
end;
Error -> Error
end.
b_object([$} | Rest]) -> {ok, #{}, Rest};
b_object(String) -> b_object(seek(String), #{}).
b_object([$} | Rest], Map) ->
{ok, Map, Rest};
b_object([$" | Rest], Map) ->
case string(Rest) of
{ok, Key, Remainder} ->
b_object_value(seek(Remainder), unicode:characters_to_binary(Key), Map);
{error, _, _} ->
{error, Map, Rest}
end;
b_object(Rest, Map) ->
{error, Map, Rest}.
b_object_value([$: | Rest], Key, Map) -> b_object_value_parse(seek(Rest), Key, Map);
b_object_value(Rest, Key, Map) -> {error, maps:put(Key, undefined, Map), Rest}.
b_object_value_parse(String, Key, Map) ->
case b_value(String) of
{ok, Value, Rest} -> b_object_next(seek(Rest), maps:put(Key, Value, Map));
{error, Value, Rest} -> {error, maps:put(Key, Value, Map), Rest};
error -> {error, Map, String}
end.
b_object_next([$, | Rest], Map) -> b_object(seek(Rest), Map);
b_object_next([$} | Rest], Map) -> {ok, Map, seek(Rest)};
b_object_next(Rest, Map) -> {error, Map, Rest}.
b_array([$] | Rest]) -> {ok, [], Rest};
b_array(String) -> b_array(seek(String), []).
b_array([$] | Rest], List) ->
{ok, lists:reverse(List), seek(Rest)};
b_array(String, List) ->
case b_value(String) of
{ok, Value, Rest} -> b_array_next(seek(Rest), [Value | List]);
{error, Value, Rest} -> {error, lists:reverse([Value | List]), Rest};
error -> {error, lists:reverse(List), String}
end.
b_array_next([$, | Rest], List) -> b_array(seek(Rest), List);
b_array_next([$] | Rest], List) -> {ok, lists:reverse(List), seek(Rest)};
b_array_next(Rest, List) -> {error, lists:reverse(List), Rest}.