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+%% @author Bob Ippolito <bob@mochimedia.com>
+%% @copyright 2007 Mochi Media, Inc.
+
+%% @doc Yet another JSON (RFC 4627) library for Erlang. mochijson2 works
+%% with binaries as strings, arrays as lists (without an {array, _})
+%% wrapper and it only knows how to decode UTF-8 (and ASCII).
+
+-module(mochijson2).
+-author('bob@mochimedia.com').
+-export([encoder/1, encode/1]).
+-export([decoder/1, decode/1]).
+
+% This is a macro to placate syntax highlighters..
+-define(Q, $\").
+-define(ADV_COL(S, N), S#decoder{offset=N+S#decoder.offset,
+ column=N+S#decoder.column}).
+-define(INC_COL(S), S#decoder{offset=1+S#decoder.offset,
+ column=1+S#decoder.column}).
+-define(INC_LINE(S), S#decoder{offset=1+S#decoder.offset,
+ column=1,
+ line=1+S#decoder.line}).
+-define(INC_CHAR(S, C),
+ case C of
+ $\n ->
+ S#decoder{column=1,
+ line=1+S#decoder.line,
+ offset=1+S#decoder.offset};
+ _ ->
+ S#decoder{column=1+S#decoder.column,
+ offset=1+S#decoder.offset}
+ end).
+-define(IS_WHITESPACE(C),
+ (C =:= $\s orelse C =:= $\t orelse C =:= $\r orelse C =:= $\n)).
+
+%% @type iolist() = [char() | binary() | iolist()]
+%% @type iodata() = iolist() | binary()
+%% @type json_string() = atom | binary()
+%% @type json_number() = integer() | float()
+%% @type json_array() = [json_term()]
+%% @type json_object() = {struct, [{json_string(), json_term()}]}
+%% @type json_iolist() = {json, iolist()}
+%% @type json_term() = json_string() | json_number() | json_array() |
+%% json_object() | json_iolist()
+
+-record(encoder, {handler=null,
+ utf8=false}).
+
+-record(decoder, {object_hook=null,
+ offset=0,
+ line=1,
+ column=1,
+ state=null}).
+
+%% @spec encoder([encoder_option()]) -> function()
+%% @doc Create an encoder/1 with the given options.
+%% @type encoder_option() = handler_option() | utf8_option()
+%% @type utf8_option() = boolean(). Emit unicode as utf8 (default - false)
+encoder(Options) ->
+ State = parse_encoder_options(Options, #encoder{}),
+ fun (O) -> json_encode(O, State) end.
+
+%% @spec encode(json_term()) -> iolist()
+%% @doc Encode the given as JSON to an iolist.
+encode(Any) ->
+ json_encode(Any, #encoder{}).
+
+%% @spec decoder([decoder_option()]) -> function()
+%% @doc Create a decoder/1 with the given options.
+decoder(Options) ->
+ State = parse_decoder_options(Options, #decoder{}),
+ fun (O) -> json_decode(O, State) end.
+
+%% @spec decode(iolist()) -> json_term()
+%% @doc Decode the given iolist to Erlang terms.
+decode(S) ->
+ json_decode(S, #decoder{}).
+
+%% Internal API
+
+parse_encoder_options([], State) ->
+ State;
+parse_encoder_options([{handler, Handler} | Rest], State) ->
+ parse_encoder_options(Rest, State#encoder{handler=Handler});
+parse_encoder_options([{utf8, Switch} | Rest], State) ->
+ parse_encoder_options(Rest, State#encoder{utf8=Switch}).
+
+parse_decoder_options([], State) ->
+ State;
+parse_decoder_options([{object_hook, Hook} | Rest], State) ->
+ parse_decoder_options(Rest, State#decoder{object_hook=Hook}).
+
+json_encode(true, _State) ->
+ <<"true">>;
+json_encode(false, _State) ->
+ <<"false">>;
+json_encode(null, _State) ->
+ <<"null">>;
+json_encode(I, _State) when is_integer(I) ->
+ integer_to_list(I);
+json_encode(F, _State) when is_float(F) ->
+ mochinum:digits(F);
+json_encode(S, State) when is_binary(S); is_atom(S) ->
+ json_encode_string(S, State);
+json_encode(Array, State) when is_list(Array) ->
+ json_encode_array(Array, State);
+json_encode({struct, Props}, State) when is_list(Props) ->
+ json_encode_proplist(Props, State);
+json_encode({json, IoList}, _State) ->
+ IoList;
+json_encode(Bad, #encoder{handler=null}) ->
+ exit({json_encode, {bad_term, Bad}});
+json_encode(Bad, State=#encoder{handler=Handler}) ->
+ json_encode(Handler(Bad), State).
+
+json_encode_array([], _State) ->
+ <<"[]">>;
+json_encode_array(L, State) ->
+ F = fun (O, Acc) ->
+ [$,, json_encode(O, State) | Acc]
+ end,
+ [$, | Acc1] = lists:foldl(F, "[", L),
+ lists:reverse([$\] | Acc1]).
+
+json_encode_proplist([], _State) ->
+ <<"{}">>;
+json_encode_proplist(Props, State) ->
+ F = fun ({K, V}, Acc) ->
+ KS = json_encode_string(K, State),
+ VS = json_encode(V, State),
+ [$,, VS, $:, KS | Acc]
+ end,
+ [$, | Acc1] = lists:foldl(F, "{", Props),
+ lists:reverse([$\} | Acc1]).
+
+json_encode_string(A, State) when is_atom(A) ->
+ L = atom_to_list(A),
+ case json_string_is_safe(L) of
+ true ->
+ [?Q, L, ?Q];
+ false ->
+ json_encode_string_unicode(xmerl_ucs:from_utf8(L), State, [?Q])
+ end;
+json_encode_string(B, State) when is_binary(B) ->
+ case json_bin_is_safe(B) of
+ true ->
+ [?Q, B, ?Q];
+ false ->
+ json_encode_string_unicode(xmerl_ucs:from_utf8(B), State, [?Q])
+ end;
+json_encode_string(I, _State) when is_integer(I) ->
+ [?Q, integer_to_list(I), ?Q];
+json_encode_string(L, State) when is_list(L) ->
+ case json_string_is_safe(L) of
+ true ->
+ [?Q, L, ?Q];
+ false ->
+ json_encode_string_unicode(L, State, [?Q])
+ end.
+
+json_string_is_safe([]) ->
+ true;
+json_string_is_safe([C | Rest]) ->
+ case C of
+ ?Q ->
+ false;
+ $\\ ->
+ false;
+ $\b ->
+ false;
+ $\f ->
+ false;
+ $\n ->
+ false;
+ $\r ->
+ false;
+ $\t ->
+ false;
+ C when C >= 0, C < $\s; C >= 16#7f, C =< 16#10FFFF ->
+ false;
+ C when C < 16#7f ->
+ json_string_is_safe(Rest);
+ _ ->
+ false
+ end.
+
+json_bin_is_safe(<<>>) ->
+ true;
+json_bin_is_safe(<<C, Rest/binary>>) ->
+ case C of
+ ?Q ->
+ false;
+ $\\ ->
+ false;
+ $\b ->
+ false;
+ $\f ->
+ false;
+ $\n ->
+ false;
+ $\r ->
+ false;
+ $\t ->
+ false;
+ C when C >= 0, C < $\s; C >= 16#7f ->
+ false;
+ C when C < 16#7f ->
+ json_bin_is_safe(Rest)
+ end.
+
+json_encode_string_unicode([], _State, Acc) ->
+ lists:reverse([$\" | Acc]);
+json_encode_string_unicode([C | Cs], State, Acc) ->
+ Acc1 = case C of
+ ?Q ->
+ [?Q, $\\ | Acc];
+ %% Escaping solidus is only useful when trying to protect
+ %% against "</script>" injection attacks which are only
+ %% possible when JSON is inserted into a HTML document
+ %% in-line. mochijson2 does not protect you from this, so
+ %% if you do insert directly into HTML then you need to
+ %% uncomment the following case or escape the output of encode.
+ %%
+ %% $/ ->
+ %% [$/, $\\ | Acc];
+ %%
+ $\\ ->
+ [$\\, $\\ | Acc];
+ $\b ->
+ [$b, $\\ | Acc];
+ $\f ->
+ [$f, $\\ | Acc];
+ $\n ->
+ [$n, $\\ | Acc];
+ $\r ->
+ [$r, $\\ | Acc];
+ $\t ->
+ [$t, $\\ | Acc];
+ C when C >= 0, C < $\s ->
+ [unihex(C) | Acc];
+ C when C >= 16#7f, C =< 16#10FFFF, State#encoder.utf8 ->
+ [xmerl_ucs:to_utf8(C) | Acc];
+ C when C >= 16#7f, C =< 16#10FFFF, not State#encoder.utf8 ->
+ [unihex(C) | Acc];
+ C when C < 16#7f ->
+ [C | Acc];
+ _ ->
+ exit({json_encode, {bad_char, C}})
+ end,
+ json_encode_string_unicode(Cs, State, Acc1).
+
+hexdigit(C) when C >= 0, C =< 9 ->
+ C + $0;
+hexdigit(C) when C =< 15 ->
+ C + $a - 10.
+
+unihex(C) when C < 16#10000 ->
+ <<D3:4, D2:4, D1:4, D0:4>> = <<C:16>>,
+ Digits = [hexdigit(D) || D <- [D3, D2, D1, D0]],
+ [$\\, $u | Digits];
+unihex(C) when C =< 16#10FFFF ->
+ N = C - 16#10000,
+ S1 = 16#d800 bor ((N bsr 10) band 16#3ff),
+ S2 = 16#dc00 bor (N band 16#3ff),
+ [unihex(S1), unihex(S2)].
+
+json_decode(L, S) when is_list(L) ->
+ json_decode(iolist_to_binary(L), S);
+json_decode(B, S) ->
+ {Res, S1} = decode1(B, S),
+ {eof, _} = tokenize(B, S1#decoder{state=trim}),
+ Res.
+
+decode1(B, S=#decoder{state=null}) ->
+ case tokenize(B, S#decoder{state=any}) of
+ {{const, C}, S1} ->
+ {C, S1};
+ {start_array, S1} ->
+ decode_array(B, S1);
+ {start_object, S1} ->
+ decode_object(B, S1)
+ end.
+
+make_object(V, #decoder{object_hook=null}) ->
+ V;
+make_object(V, #decoder{object_hook=Hook}) ->
+ Hook(V).
+
+decode_object(B, S) ->
+ decode_object(B, S#decoder{state=key}, []).
+
+decode_object(B, S=#decoder{state=key}, Acc) ->
+ case tokenize(B, S) of
+ {end_object, S1} ->
+ V = make_object({struct, lists:reverse(Acc)}, S1),
+ {V, S1#decoder{state=null}};
+ {{const, K}, S1} ->
+ {colon, S2} = tokenize(B, S1),
+ {V, S3} = decode1(B, S2#decoder{state=null}),
+ decode_object(B, S3#decoder{state=comma}, [{K, V} | Acc])
+ end;
+decode_object(B, S=#decoder{state=comma}, Acc) ->
+ case tokenize(B, S) of
+ {end_object, S1} ->
+ V = make_object({struct, lists:reverse(Acc)}, S1),
+ {V, S1#decoder{state=null}};
+ {comma, S1} ->
+ decode_object(B, S1#decoder{state=key}, Acc)
+ end.
+
+decode_array(B, S) ->
+ decode_array(B, S#decoder{state=any}, []).
+
+decode_array(B, S=#decoder{state=any}, Acc) ->
+ case tokenize(B, S) of
+ {end_array, S1} ->
+ {lists:reverse(Acc), S1#decoder{state=null}};
+ {start_array, S1} ->
+ {Array, S2} = decode_array(B, S1),
+ decode_array(B, S2#decoder{state=comma}, [Array | Acc]);
+ {start_object, S1} ->
+ {Array, S2} = decode_object(B, S1),
+ decode_array(B, S2#decoder{state=comma}, [Array | Acc]);
+ {{const, Const}, S1} ->
+ decode_array(B, S1#decoder{state=comma}, [Const | Acc])
+ end;
+decode_array(B, S=#decoder{state=comma}, Acc) ->
+ case tokenize(B, S) of
+ {end_array, S1} ->
+ {lists:reverse(Acc), S1#decoder{state=null}};
+ {comma, S1} ->
+ decode_array(B, S1#decoder{state=any}, Acc)
+ end.
+
+tokenize_string(B, S=#decoder{offset=O}) ->
+ case tokenize_string_fast(B, O) of
+ {escape, O1} ->
+ Length = O1 - O,
+ S1 = ?ADV_COL(S, Length),
+ <<_:O/binary, Head:Length/binary, _/binary>> = B,
+ tokenize_string(B, S1, lists:reverse(binary_to_list(Head)));
+ O1 ->
+ Length = O1 - O,
+ <<_:O/binary, String:Length/binary, ?Q, _/binary>> = B,
+ {{const, String}, ?ADV_COL(S, Length + 1)}
+ end.
+
+tokenize_string_fast(B, O) ->
+ case B of
+ <<_:O/binary, ?Q, _/binary>> ->
+ O;
+ <<_:O/binary, $\\, _/binary>> ->
+ {escape, O};
+ <<_:O/binary, C1, _/binary>> when C1 < 128 ->
+ tokenize_string_fast(B, 1 + O);
+ <<_:O/binary, C1, C2, _/binary>> when C1 >= 194, C1 =< 223,
+ C2 >= 128, C2 =< 191 ->
+ tokenize_string_fast(B, 2 + O);
+ <<_:O/binary, C1, C2, C3, _/binary>> when C1 >= 224, C1 =< 239,
+ C2 >= 128, C2 =< 191,
+ C3 >= 128, C3 =< 191 ->
+ tokenize_string_fast(B, 3 + O);
+ <<_:O/binary, C1, C2, C3, C4, _/binary>> when C1 >= 240, C1 =< 244,
+ C2 >= 128, C2 =< 191,
+ C3 >= 128, C3 =< 191,
+ C4 >= 128, C4 =< 191 ->
+ tokenize_string_fast(B, 4 + O);
+ _ ->
+ throw(invalid_utf8)
+ end.
+
+tokenize_string(B, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, ?Q, _/binary>> ->
+ {{const, iolist_to_binary(lists:reverse(Acc))}, ?INC_COL(S)};
+ <<_:O/binary, "\\\"", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\" | Acc]);
+ <<_:O/binary, "\\\\", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\\ | Acc]);
+ <<_:O/binary, "\\/", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$/ | Acc]);
+ <<_:O/binary, "\\b", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\b | Acc]);
+ <<_:O/binary, "\\f", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\f | Acc]);
+ <<_:O/binary, "\\n", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\n | Acc]);
+ <<_:O/binary, "\\r", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\r | Acc]);
+ <<_:O/binary, "\\t", _/binary>> ->
+ tokenize_string(B, ?ADV_COL(S, 2), [$\t | Acc]);
+ <<_:O/binary, "\\u", C3, C2, C1, C0, Rest/binary>> ->
+ C = erlang:list_to_integer([C3, C2, C1, C0], 16),
+ if C > 16#D7FF, C < 16#DC00 ->
+ %% coalesce UTF-16 surrogate pair
+ <<"\\u", D3, D2, D1, D0, _/binary>> = Rest,
+ D = erlang:list_to_integer([D3,D2,D1,D0], 16),
+ [CodePoint] = xmerl_ucs:from_utf16be(<<C:16/big-unsigned-integer,
+ D:16/big-unsigned-integer>>),
+ Acc1 = lists:reverse(xmerl_ucs:to_utf8(CodePoint), Acc),
+ tokenize_string(B, ?ADV_COL(S, 12), Acc1);
+ true ->
+ Acc1 = lists:reverse(xmerl_ucs:to_utf8(C), Acc),
+ tokenize_string(B, ?ADV_COL(S, 6), Acc1)
+ end;
+ <<_:O/binary, C1, _/binary>> when C1 < 128 ->
+ tokenize_string(B, ?INC_CHAR(S, C1), [C1 | Acc]);
+ <<_:O/binary, C1, C2, _/binary>> when C1 >= 194, C1 =< 223,
+ C2 >= 128, C2 =< 191 ->
+ tokenize_string(B, ?ADV_COL(S, 2), [C2, C1 | Acc]);
+ <<_:O/binary, C1, C2, C3, _/binary>> when C1 >= 224, C1 =< 239,
+ C2 >= 128, C2 =< 191,
+ C3 >= 128, C3 =< 191 ->
+ tokenize_string(B, ?ADV_COL(S, 3), [C3, C2, C1 | Acc]);
+ <<_:O/binary, C1, C2, C3, C4, _/binary>> when C1 >= 240, C1 =< 244,
+ C2 >= 128, C2 =< 191,
+ C3 >= 128, C3 =< 191,
+ C4 >= 128, C4 =< 191 ->
+ tokenize_string(B, ?ADV_COL(S, 4), [C4, C3, C2, C1 | Acc]);
+ _ ->
+ throw(invalid_utf8)
+ end.
+
+tokenize_number(B, S) ->
+ case tokenize_number(B, sign, S, []) of
+ {{int, Int}, S1} ->
+ {{const, list_to_integer(Int)}, S1};
+ {{float, Float}, S1} ->
+ {{const, list_to_float(Float)}, S1}
+ end.
+
+tokenize_number(B, sign, S=#decoder{offset=O}, []) ->
+ case B of
+ <<_:O/binary, $-, _/binary>> ->
+ tokenize_number(B, int, ?INC_COL(S), [$-]);
+ _ ->
+ tokenize_number(B, int, S, [])
+ end;
+tokenize_number(B, int, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, $0, _/binary>> ->
+ tokenize_number(B, frac, ?INC_COL(S), [$0 | Acc]);
+ <<_:O/binary, C, _/binary>> when C >= $1 andalso C =< $9 ->
+ tokenize_number(B, int1, ?INC_COL(S), [C | Acc])
+ end;
+tokenize_number(B, int1, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when C >= $0 andalso C =< $9 ->
+ tokenize_number(B, int1, ?INC_COL(S), [C | Acc]);
+ _ ->
+ tokenize_number(B, frac, S, Acc)
+ end;
+tokenize_number(B, frac, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, $., C, _/binary>> when C >= $0, C =< $9 ->
+ tokenize_number(B, frac1, ?ADV_COL(S, 2), [C, $. | Acc]);
+ <<_:O/binary, E, _/binary>> when E =:= $e orelse E =:= $E ->
+ tokenize_number(B, esign, ?INC_COL(S), [$e, $0, $. | Acc]);
+ _ ->
+ {{int, lists:reverse(Acc)}, S}
+ end;
+tokenize_number(B, frac1, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when C >= $0 andalso C =< $9 ->
+ tokenize_number(B, frac1, ?INC_COL(S), [C | Acc]);
+ <<_:O/binary, E, _/binary>> when E =:= $e orelse E =:= $E ->
+ tokenize_number(B, esign, ?INC_COL(S), [$e | Acc]);
+ _ ->
+ {{float, lists:reverse(Acc)}, S}
+ end;
+tokenize_number(B, esign, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when C =:= $- orelse C=:= $+ ->
+ tokenize_number(B, eint, ?INC_COL(S), [C | Acc]);
+ _ ->
+ tokenize_number(B, eint, S, Acc)
+ end;
+tokenize_number(B, eint, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when C >= $0 andalso C =< $9 ->
+ tokenize_number(B, eint1, ?INC_COL(S), [C | Acc])
+ end;
+tokenize_number(B, eint1, S=#decoder{offset=O}, Acc) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when C >= $0 andalso C =< $9 ->
+ tokenize_number(B, eint1, ?INC_COL(S), [C | Acc]);
+ _ ->
+ {{float, lists:reverse(Acc)}, S}
+ end.
+
+tokenize(B, S=#decoder{offset=O}) ->
+ case B of
+ <<_:O/binary, C, _/binary>> when ?IS_WHITESPACE(C) ->
+ tokenize(B, ?INC_CHAR(S, C));
+ <<_:O/binary, "{", _/binary>> ->
+ {start_object, ?INC_COL(S)};
+ <<_:O/binary, "}", _/binary>> ->
+ {end_object, ?INC_COL(S)};
+ <<_:O/binary, "[", _/binary>> ->
+ {start_array, ?INC_COL(S)};
+ <<_:O/binary, "]", _/binary>> ->
+ {end_array, ?INC_COL(S)};
+ <<_:O/binary, ",", _/binary>> ->
+ {comma, ?INC_COL(S)};
+ <<_:O/binary, ":", _/binary>> ->
+ {colon, ?INC_COL(S)};
+ <<_:O/binary, "null", _/binary>> ->
+ {{const, null}, ?ADV_COL(S, 4)};
+ <<_:O/binary, "true", _/binary>> ->
+ {{const, true}, ?ADV_COL(S, 4)};
+ <<_:O/binary, "false", _/binary>> ->
+ {{const, false}, ?ADV_COL(S, 5)};
+ <<_:O/binary, "\"", _/binary>> ->
+ tokenize_string(B, ?INC_COL(S));
+ <<_:O/binary, C, _/binary>> when (C >= $0 andalso C =< $9)
+ orelse C =:= $- ->
+ tokenize_number(B, S);
+ <<_:O/binary>> ->
+ trim = S#decoder.state,
+ {eof, S}
+ end.
+%%
+%% Tests
+%%
+-include_lib("eunit/include/eunit.hrl").
+-ifdef(TEST).
+
+
+%% testing constructs borrowed from the Yaws JSON implementation.
+
+%% Create an object from a list of Key/Value pairs.
+
+obj_new() ->
+ {struct, []}.
+
+is_obj({struct, Props}) ->
+ F = fun ({K, _}) when is_binary(K) -> true end,
+ lists:all(F, Props).
+
+obj_from_list(Props) ->
+ Obj = {struct, Props},
+ ?assert(is_obj(Obj)),
+ Obj.
+
+%% Test for equivalence of Erlang terms.
+%% Due to arbitrary order of construction, equivalent objects might
+%% compare unequal as erlang terms, so we need to carefully recurse
+%% through aggregates (tuples and objects).
+
+equiv({struct, Props1}, {struct, Props2}) ->
+ equiv_object(Props1, Props2);
+equiv(L1, L2) when is_list(L1), is_list(L2) ->
+ equiv_list(L1, L2);
+equiv(N1, N2) when is_number(N1), is_number(N2) -> N1 == N2;
+equiv(B1, B2) when is_binary(B1), is_binary(B2) -> B1 == B2;
+equiv(A, A) when A =:= true orelse A =:= false orelse A =:= null -> true.
+
+%% Object representation and traversal order is unknown.
+%% Use the sledgehammer and sort property lists.
+
+equiv_object(Props1, Props2) ->
+ L1 = lists:keysort(1, Props1),
+ L2 = lists:keysort(1, Props2),
+ Pairs = lists:zip(L1, L2),
+ true = lists:all(fun({{K1, V1}, {K2, V2}}) ->
+ equiv(K1, K2) and equiv(V1, V2)
+ end, Pairs).
+
+%% Recursively compare tuple elements for equivalence.
+
+equiv_list([], []) ->
+ true;
+equiv_list([V1 | L1], [V2 | L2]) ->
+ equiv(V1, V2) andalso equiv_list(L1, L2).
+
+decode_test() ->
+ [1199344435545.0, 1] = decode(<<"[1199344435545.0,1]">>),
+ <<16#F0,16#9D,16#9C,16#95>> = decode([34,"\\ud835","\\udf15",34]).
+
+e2j_vec_test() ->
+ test_one(e2j_test_vec(utf8), 1).
+
+test_one([], _N) ->
+ %% io:format("~p tests passed~n", [N-1]),
+ ok;
+test_one([{E, J} | Rest], N) ->
+ %% io:format("[~p] ~p ~p~n", [N, E, J]),
+ true = equiv(E, decode(J)),
+ true = equiv(E, decode(encode(E))),
+ test_one(Rest, 1+N).
+
+e2j_test_vec(utf8) ->
+ [
+ {1, "1"},
+ {3.1416, "3.14160"}, %% text representation may truncate, trail zeroes
+ {-1, "-1"},
+ {-3.1416, "-3.14160"},
+ {12.0e10, "1.20000e+11"},
+ {1.234E+10, "1.23400e+10"},
+ {-1.234E-10, "-1.23400e-10"},
+ {10.0, "1.0e+01"},
+ {123.456, "1.23456E+2"},
+ {10.0, "1e1"},
+ {<<"foo">>, "\"foo\""},
+ {<<"foo", 5, "bar">>, "\"foo\\u0005bar\""},
+ {<<"">>, "\"\""},
+ {<<"\n\n\n">>, "\"\\n\\n\\n\""},
+ {<<"\" \b\f\r\n\t\"">>, "\"\\\" \\b\\f\\r\\n\\t\\\"\""},
+ {obj_new(), "{}"},
+ {obj_from_list([{<<"foo">>, <<"bar">>}]), "{\"foo\":\"bar\"}"},
+ {obj_from_list([{<<"foo">>, <<"bar">>}, {<<"baz">>, 123}]),
+ "{\"foo\":\"bar\",\"baz\":123}"},
+ {[], "[]"},
+ {[[]], "[[]]"},
+ {[1, <<"foo">>], "[1,\"foo\"]"},
+
+ %% json array in a json object
+ {obj_from_list([{<<"foo">>, [123]}]),
+ "{\"foo\":[123]}"},
+
+ %% json object in a json object
+ {obj_from_list([{<<"foo">>, obj_from_list([{<<"bar">>, true}])}]),
+ "{\"foo\":{\"bar\":true}}"},
+
+ %% fold evaluation order
+ {obj_from_list([{<<"foo">>, []},
+ {<<"bar">>, obj_from_list([{<<"baz">>, true}])},
+ {<<"alice">>, <<"bob">>}]),
+ "{\"foo\":[],\"bar\":{\"baz\":true},\"alice\":\"bob\"}"},
+
+ %% json object in a json array
+ {[-123, <<"foo">>, obj_from_list([{<<"bar">>, []}]), null],
+ "[-123,\"foo\",{\"bar\":[]},null]"}
+ ].
+
+%% test utf8 encoding
+encoder_utf8_test() ->
+ %% safe conversion case (default)
+ [34,"\\u0001","\\u0442","\\u0435","\\u0441","\\u0442",34] =
+ encode(<<1,"\321\202\320\265\321\201\321\202">>),
+
+ %% raw utf8 output (optional)
+ Enc = mochijson2:encoder([{utf8, true}]),
+ [34,"\\u0001",[209,130],[208,181],[209,129],[209,130],34] =
+ Enc(<<1,"\321\202\320\265\321\201\321\202">>).
+
+input_validation_test() ->
+ Good = [
+ {16#00A3, <<?Q, 16#C2, 16#A3, ?Q>>}, %% pound
+ {16#20AC, <<?Q, 16#E2, 16#82, 16#AC, ?Q>>}, %% euro
+ {16#10196, <<?Q, 16#F0, 16#90, 16#86, 16#96, ?Q>>} %% denarius
+ ],
+ lists:foreach(fun({CodePoint, UTF8}) ->
+ Expect = list_to_binary(xmerl_ucs:to_utf8(CodePoint)),
+ Expect = decode(UTF8)
+ end, Good),
+
+ Bad = [
+ %% 2nd, 3rd, or 4th byte of a multi-byte sequence w/o leading byte
+ <<?Q, 16#80, ?Q>>,
+ %% missing continuations, last byte in each should be 80-BF
+ <<?Q, 16#C2, 16#7F, ?Q>>,
+ <<?Q, 16#E0, 16#80,16#7F, ?Q>>,
+ <<?Q, 16#F0, 16#80, 16#80, 16#7F, ?Q>>,
+ %% we don't support code points > 10FFFF per RFC 3629
+ <<?Q, 16#F5, 16#80, 16#80, 16#80, ?Q>>,
+ %% escape characters trigger a different code path
+ <<?Q, $\\, $\n, 16#80, ?Q>>
+ ],
+ lists:foreach(
+ fun(X) ->
+ ok = try decode(X) catch invalid_utf8 -> ok end,
+ %% could be {ucs,{bad_utf8_character_code}} or
+ %% {json_encode,{bad_char,_}}
+ {'EXIT', _} = (catch encode(X))
+ end, Bad).
+
+inline_json_test() ->
+ ?assertEqual(<<"\"iodata iodata\"">>,
+ iolist_to_binary(
+ encode({json, [<<"\"iodata">>, " iodata\""]}))),
+ ?assertEqual({struct, [{<<"key">>, <<"iodata iodata">>}]},
+ decode(
+ encode({struct,
+ [{key, {json, [<<"\"iodata">>, " iodata\""]}}]}))),
+ ok.
+
+big_unicode_test() ->
+ UTF8Seq = list_to_binary(xmerl_ucs:to_utf8(16#0001d120)),
+ ?assertEqual(
+ <<"\"\\ud834\\udd20\"">>,
+ iolist_to_binary(encode(UTF8Seq))),
+ ?assertEqual(
+ UTF8Seq,
+ decode(iolist_to_binary(encode(UTF8Seq)))),
+ ok.
+
+custom_decoder_test() ->
+ ?assertEqual(
+ {struct, [{<<"key">>, <<"value">>}]},
+ (decoder([]))("{\"key\": \"value\"}")),
+ F = fun ({struct, [{<<"key">>, <<"value">>}]}) -> win end,
+ ?assertEqual(
+ win,
+ (decoder([{object_hook, F}]))("{\"key\": \"value\"}")),
+ ok.
+
+atom_test() ->
+ %% JSON native atoms
+ [begin
+ ?assertEqual(A, decode(atom_to_list(A))),
+ ?assertEqual(iolist_to_binary(atom_to_list(A)),
+ iolist_to_binary(encode(A)))
+ end || A <- [true, false, null]],
+ %% Atom to string
+ ?assertEqual(
+ <<"\"foo\"">>,
+ iolist_to_binary(encode(foo))),
+ ?assertEqual(
+ <<"\"\\ud834\\udd20\"">>,
+ iolist_to_binary(encode(list_to_atom(xmerl_ucs:to_utf8(16#0001d120))))),
+ ok.
+
+key_encode_test() ->
+ %% Some forms are accepted as keys that would not be strings in other
+ %% cases
+ ?assertEqual(
+ <<"{\"foo\":1}">>,
+ iolist_to_binary(encode({struct, [{foo, 1}]}))),
+ ?assertEqual(
+ <<"{\"foo\":1}">>,
+ iolist_to_binary(encode({struct, [{<<"foo">>, 1}]}))),
+ ?assertEqual(
+ <<"{\"foo\":1}">>,
+ iolist_to_binary(encode({struct, [{"foo", 1}]}))),
+ ?assertEqual(
+ <<"{\"\\ud834\\udd20\":1}">>,
+ iolist_to_binary(
+ encode({struct, [{[16#0001d120], 1}]}))),
+ ?assertEqual(
+ <<"{\"1\":1}">>,
+ iolist_to_binary(encode({struct, [{1, 1}]}))),
+ ok.
+
+unsafe_chars_test() ->
+ Chars = "\"\\\b\f\n\r\t",
+ [begin
+ ?assertEqual(false, json_string_is_safe([C])),
+ ?assertEqual(false, json_bin_is_safe(<<C>>)),
+ ?assertEqual(<<C>>, decode(encode(<<C>>)))
+ end || C <- Chars],
+ ?assertEqual(
+ false,
+ json_string_is_safe([16#0001d120])),
+ ?assertEqual(
+ false,
+ json_bin_is_safe(list_to_binary(xmerl_ucs:to_utf8(16#0001d120)))),
+ ?assertEqual(
+ [16#0001d120],
+ xmerl_ucs:from_utf8(
+ binary_to_list(
+ decode(encode(list_to_atom(xmerl_ucs:to_utf8(16#0001d120))))))),
+ ?assertEqual(
+ false,
+ json_string_is_safe([16#110000])),
+ ?assertEqual(
+ false,
+ json_bin_is_safe(list_to_binary(xmerl_ucs:to_utf8([16#110000])))),
+ %% solidus can be escaped but isn't unsafe by default
+ ?assertEqual(
+ <<"/">>,
+ decode(<<"\"\\/\"">>)),
+ ok.
+
+int_test() ->
+ ?assertEqual(0, decode("0")),
+ ?assertEqual(1, decode("1")),
+ ?assertEqual(11, decode("11")),
+ ok.
+
+large_int_test() ->
+ ?assertEqual(<<"-2147483649214748364921474836492147483649">>,
+ iolist_to_binary(encode(-2147483649214748364921474836492147483649))),
+ ?assertEqual(<<"2147483649214748364921474836492147483649">>,
+ iolist_to_binary(encode(2147483649214748364921474836492147483649))),
+ ok.
+
+float_test() ->
+ ?assertEqual(<<"-2147483649.0">>, iolist_to_binary(encode(-2147483649.0))),
+ ?assertEqual(<<"2147483648.0">>, iolist_to_binary(encode(2147483648.0))),
+ ok.
+
+handler_test() ->
+ ?assertEqual(
+ {'EXIT',{json_encode,{bad_term,{}}}},
+ catch encode({})),
+ F = fun ({}) -> [] end,
+ ?assertEqual(
+ <<"[]">>,
+ iolist_to_binary((encoder([{handler, F}]))({}))),
+ ok.
+
+-endif.
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 21:04:00 +0000