114 lines
No EOL
4.8 KiB
Erlang
114 lines
No EOL
4.8 KiB
Erlang
%% The MIT License
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%% Copyright (c) 2010 Alisdair Sullivan <alisdairsullivan@yahoo.ca>
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%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%% of this software and associated documentation files (the "Software"), to deal
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%% in the Software without restriction, including without limitation the rights
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%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%% copies of the Software, and to permit persons to whom the Software is
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%% furnished to do so, subject to the following conditions:
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%% The above copyright notice and this permission notice shall be included in
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%% all copies or substantial portions of the Software.
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%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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%% THE SOFTWARE.
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-module(jsx_eep0018).
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-author("alisdairsullivan@yahoo.ca").
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-export([json_to_term/1, json_to_term/2]).
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json_to_term(JSON) ->
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json_to_term(JSON, []).
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json_to_term(JSON, Opts) ->
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Encoding = proplists:get_value(encoding, Opts, utf8),
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P = jsx:parser([{encoding, Encoding}]),
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collect(P(JSON), [[]], Opts).
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collect({event, Start, Next}, Acc, Opts) when Start =:= start_object; Start =:= start_array ->
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collect(Next(), [[]|Acc], Opts);
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%% special case for empty object
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collect({event, end_object, Next}, [[], Parent|Rest], Opts) ->
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collect(Next(), [[[{}]] ++ Parent] ++ Rest, Opts);
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%% reverse the array/object accumulator before prepending it to it's parent
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collect({event, end_object, Next}, [Current, Parent|Rest], Opts) when is_list(Parent) ->
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collect(Next(), [[lists:reverse(Current)] ++ Parent] ++ Rest, Opts);
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collect({event, end_array, Next}, [Current, Parent|Rest], Opts) when is_list(Parent) ->
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collect(Next(), [[lists:reverse(Current)] ++ Parent] ++ Rest, Opts);
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collect({event, Start, Next}, [Current, Key, Parent|Rest], Opts)
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when Start =:= end_object; Start =:= end_array ->
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collect(Next(), [[{Key, lists:reverse(Current)}] ++ Parent] ++ Rest, Opts);
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%% end of json is emitted asap (at close of array/object), calling Next() a final
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%% time and then Force() ensures the tail of the json binary is clean (whitespace only)
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collect({event, end_json, Next}, Acc, _Opts) ->
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collect(Next(), Acc, _Opts);
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%% key can only be emitted inside of a json object, so just insert it directly into
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%% the head of the accumulator, deal with it when we receive it's paired value
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collect({event, {key, _} = PreKey, Next}, [Current|_] = Acc, Opts) ->
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Key = event(PreKey, Opts),
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case key_repeats(Key, Current) of
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true -> erlang:throw(badarg)
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; false -> collect(Next(), [Key] ++ Acc, Opts)
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end;
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%% check acc to see if we're inside an object or an array. because inside an object
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%% context the events that fall this far are always preceded by a key (which are
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%% binaries or atoms), if Current is a list, we're inside an array, else, an
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%% object
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collect({event, Event, Next}, [Current|Rest], Opts) when is_list(Current) ->
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collect(Next(), [[event(Event, Opts)] ++ Current] ++ Rest, Opts);
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collect({event, Event, Next}, [Key, Current|Rest], Opts) ->
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collect(Next(), [[{Key, event(Event, Opts)}] ++ Current] ++ Rest, Opts);
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%%
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collect({incomplete, _Next, Force}, [[Acc]], _Opts) when is_list(Acc) ->
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case Force() of
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{incomplete, _, _} -> Acc
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; _ -> erlang:throw(badarg)
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end;
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collect(_, _, _) -> erlang:throw(badarg).
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event({string, String}, _Opts) ->
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unicode:characters_to_binary(String);
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event({key, Key}, Opts) ->
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case proplists:get_value(label, Opts, binary) of
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binary -> unicode:characters_to_binary(Key)
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; atom ->
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try list_to_atom(Key)
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catch error:badarg -> unicode:characters_to_binary(Key) end
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; existing_atom ->
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try list_to_existing_atom(Key)
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catch error:badarg -> unicode:characters_to_binary(Key) end
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end;
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%% special case for negative zero
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event({integer, "-0"}, _Opts) ->
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erlang:float(erlang:list_to_integer("-0"));
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event({integer, Integer}, Opts) ->
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case proplists:get_value(float, Opts, false) of
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true -> erlang:float(erlang:list_to_integer(Integer))
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; false -> erlang:list_to_integer(Integer)
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end;
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event({float, Float}, _Opts) ->
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erlang:list_to_float(Float);
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event({literal, Literal}, _Opts) ->
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Literal.
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key_repeats(Key, [{Key, _Value}|_Rest]) -> true;
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key_repeats(Key, [_|Rest]) -> key_repeats(Key, Rest);
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key_repeats(_Key, []) -> false. |