507 lines
No EOL
19 KiB
Erlang
507 lines
No EOL
19 KiB
Erlang
%% The MIT License
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%% Copyright (c) 2012 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_parser).
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-export([parser/3]).
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-spec parser(Handler::module(), State::any(), Opts::jsx:opts()) -> jsx:parser().
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parser(Handler, State, Opts) ->
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fun(Tokens) -> value(Tokens, {Handler, Handler:init(State)}, [], jsx_utils:parse_opts(Opts)) end.
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-include("jsx_opts.hrl").
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%% error, incomplete and event macros
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-ifndef(error).
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-define(error(Args),
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erlang:error(badarg, Args)
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).
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-endif.
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-ifndef(incomplete).
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-define(incomplete(State, Handler, Stack, Opts),
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{incomplete, fun(end_stream) ->
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case State([end_json],
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Handler,
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Stack,
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Opts) of
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{incomplete, _} -> ?error([Handler, Stack, Opts])
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; Events -> Events
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end
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; (Tokens) ->
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State(Tokens, Handler, Stack, Opts)
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end
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}
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).
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-endif.
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handle_event([], Handler, _Opts) -> Handler;
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handle_event([Event|Rest], Handler, Opts) -> handle_event(Rest, handle_event(Event, Handler, Opts), Opts);
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handle_event(Event, {Handler, State}, _Opts) -> {Handler, Handler:handle_event(Event, State)}.
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value([start_object|Tokens], Handler, Stack, Opts) ->
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object(Tokens, handle_event(start_object, Handler, Opts), [object|Stack], Opts);
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value([start_array|Tokens], Handler, Stack, Opts) ->
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array(Tokens, handle_event(start_array, Handler, Opts), [array|Stack], Opts);
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value([{literal, true}|Tokens], Handler, [], Opts) ->
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done(Tokens, handle_event({literal, true}, Handler, Opts), [], Opts);
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value([{literal, false}|Tokens], Handler, [], Opts) ->
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done(Tokens, handle_event({literal, false}, Handler, Opts), [], Opts);
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value([{literal, null}|Tokens], Handler, [], Opts) ->
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done(Tokens, handle_event({literal, null}, Handler, Opts), [], Opts);
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value([{literal, true}|Tokens], Handler, Stack, Opts) ->
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maybe_done(Tokens, handle_event({literal, true}, Handler, Opts), Stack, Opts);
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value([{literal, false}|Tokens], Handler, Stack, Opts) ->
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maybe_done(Tokens, handle_event({literal, false}, Handler, Opts), Stack, Opts);
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value([{literal, null}|Tokens], Handler, Stack, Opts) ->
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maybe_done(Tokens, handle_event({literal, null}, Handler, Opts), Stack, Opts);
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value([Literal|Tokens], Handler, Stack, Opts) when Literal == true; Literal == false; Literal == null ->
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value([{literal, Literal}] ++ Tokens, Handler, Stack, Opts);
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value([{integer, Number}|Tokens], Handler, [], Opts) when is_integer(Number) ->
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done(Tokens, handle_event({integer, Number}, Handler, Opts), [], Opts);
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value([{float, Number}|Tokens], Handler, [], Opts) when is_float(Number) ->
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done(Tokens, handle_event({float, Number}, Handler, Opts), [], Opts);
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value([{integer, Number}|Tokens], Handler, Stack, Opts) when is_integer(Number) ->
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maybe_done(Tokens, handle_event({integer, Number}, Handler, Opts), Stack, Opts);
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value([{float, Number}|Tokens], Handler, Stack, Opts) when is_float(Number) ->
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maybe_done(Tokens, handle_event({float, Number}, Handler, Opts), Stack, Opts);
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value([{number, Number}|Tokens], Handler, Stack, Opts) when is_integer(Number) ->
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value([{integer, Number}] ++ Tokens, Handler, Stack, Opts);
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value([{number, Number}|Tokens], Handler, Stack, Opts) when is_float(Number) ->
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value([{float, Number}] ++ Tokens, Handler, Stack, Opts);
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value([Number|Tokens], Handler, Stack, Opts) when is_integer(Number) ->
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value([{integer, Number}] ++ Tokens, Handler, Stack, Opts);
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value([Number|Tokens], Handler, Stack, Opts) when is_float(Number) ->
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value([{float, Number}] ++ Tokens, Handler, Stack, Opts);
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value([{string, String}|Tokens], Handler, [], Opts) when is_binary(String) ->
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done(Tokens, handle_event({string, clean_string(String, Opts)}, Handler, Opts), [], Opts);
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value([{string, String}|Tokens], Handler, Stack, Opts) when is_binary(String) ->
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maybe_done(Tokens, handle_event({string, clean_string(String, Opts)}, Handler, Opts), Stack, Opts);
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value([String|Tokens], Handler, Stack, Opts) when is_binary(String) ->
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value([{string, String}] ++ Tokens, Handler, Stack, Opts);
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value([], Handler, Stack, Opts) ->
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?incomplete(value, Handler, Stack, Opts);
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value(BadTokens, Handler, Stack, Opts) when is_list(BadTokens) ->
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?error([BadTokens, Handler, Stack, Opts]);
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value(Token, Handler, Stack, Opts) ->
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value([Token], Handler, Stack, Opts).
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object([end_object|Tokens], Handler, [object|Stack], Opts) ->
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maybe_done(Tokens, handle_event(end_object, Handler, Opts), Stack, Opts);
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object([{key, Key}|Tokens], Handler, Stack, Opts) when is_atom(Key); is_binary(Key) ->
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value(Tokens, handle_event({key, clean_string(fix_key(Key), Opts)}, Handler, Opts), Stack, Opts);
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object([Key|Tokens], Handler, Stack, Opts) when is_atom(Key); is_binary(Key) ->
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value(Tokens, handle_event({key, clean_string(fix_key(Key), Opts)}, Handler, Opts), Stack, Opts);
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object([], Handler, Stack, Opts) ->
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?incomplete(object, Handler, Stack, Opts);
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object(BadTokens, Handler, Stack, Opts) when is_list(BadTokens) ->
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?error([BadTokens, Handler, Stack, Opts]);
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object(Token, Handler, Stack, Opts) ->
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object([Token], Handler, Stack, Opts).
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array([end_array|Tokens], Handler, [array|Stack], Opts) ->
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maybe_done(Tokens, handle_event(end_array, Handler, Opts), Stack, Opts);
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array([], Handler, Stack, Opts) ->
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?incomplete(array, Handler, Stack, Opts);
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array(Tokens, Handler, Stack, Opts) when is_list(Tokens) ->
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value(Tokens, Handler, Stack, Opts);
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array(Token, Handler, Stack, Opts) ->
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array([Token], Handler, Stack, Opts).
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maybe_done([end_json], Handler, [], Opts) ->
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done([], Handler, [], Opts);
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maybe_done(Tokens, Handler, [object|_] = Stack, Opts) when is_list(Tokens) ->
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object(Tokens, Handler, Stack, Opts);
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maybe_done(Tokens, Handler, [array|_] = Stack, Opts) when is_list(Tokens) ->
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array(Tokens, Handler, Stack, Opts);
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maybe_done([], Handler, Stack, Opts) ->
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?incomplete(maybe_done, Handler, Stack, Opts);
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maybe_done(BadTokens, Handler, Stack, Opts) when is_list(BadTokens) ->
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?error([BadTokens, Handler, Stack, Opts]);
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maybe_done(Token, Handler, Stack, Opts) ->
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maybe_done([Token], Handler, Stack, Opts).
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done(Tokens, Handler, [], Opts) when Tokens == [end_json]; Tokens == [] ->
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{_, State} = handle_event(end_json, Handler, Opts),
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State;
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done(BadTokens, Handler, Stack, Opts) when is_list(BadTokens) ->
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?error([BadTokens, Handler, Stack, Opts]);
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done(Token, Handler, Stack, Opts) ->
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done([Token], Handler, Stack, Opts).
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fix_key(Key) when is_atom(Key) -> fix_key(atom_to_binary(Key, utf8));
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fix_key(Key) when is_binary(Key) -> Key.
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clean_string(Bin, Opts) -> jsx_utils:clean_string(Bin, Opts).
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-ifdef(TEST).
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-include_lib("eunit/include/eunit.hrl").
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incomplete_test_() ->
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F = parser(jsx, [], []),
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[
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{"incomplete test", ?_assertEqual(
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begin
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{incomplete, A} = F(start_object),
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{incomplete, B} = A(key),
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{incomplete, C} = B(true),
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{incomplete, D} = C(end_object),
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D(end_json)
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end,
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[start_object, {key, <<"key">>}, {literal, true}, end_object, end_json]
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)}
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].
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encode(Term) -> encode(Term, []).
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encode(Term, Opts) ->
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try (parser(jsx, [], Opts))(Term)
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catch error:badarg -> {error, badarg}
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end.
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encode_test_() ->
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[
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{"naked string", ?_assertEqual(
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encode([{string, <<"a string\n">>}, end_json]), [{string, <<"a string\n">>}, end_json]
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)},
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{"naked integer - simple rep", ?_assertEqual(
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encode([123, end_json]), [{integer, 123}, end_json]
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)},
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{"naked integer - alt rep", ?_assertEqual(
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encode([{number, 123}, end_json]), [{integer, 123}, end_json]
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)},
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{"naked integer - full rep", ?_assertEqual(
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encode([{integer, 123}, end_json]), [{integer, 123}, end_json]
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)},
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{"naked float - simple rep", ?_assertEqual(
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encode([1.23, end_json]), [{float, 1.23}, end_json]
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)},
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{"naked float - alt rep", ?_assertEqual(
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encode([{number, 1.23}, end_json]), [{float, 1.23}, end_json]
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)},
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{"naked float - full rep", ?_assertEqual(
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encode([{float, 1.23}, end_json]), [{float, 1.23}, end_json]
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)},
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{"naked literal - simple rep", ?_assertEqual(
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encode([null, end_json]), [{literal, null}, end_json]
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)},
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{"naked literal - full rep", ?_assertEqual(
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encode([{literal, null}, end_json]), [{literal, null}, end_json]
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)},
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{"empty object", ?_assertEqual(
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encode([start_object, end_object, end_json]), [start_object, end_object, end_json]
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)},
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{"empty list", ?_assertEqual(
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encode([start_array, end_array, end_json]), [start_array, end_array, end_json]
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)},
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{"simple list", ?_assertEqual(
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encode([
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start_array,
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{integer, 1},
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{integer, 2},
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{integer, 3},
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{literal, true},
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{literal, false},
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end_array,
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end_json
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]),
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[
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start_array,
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{integer, 1},
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{integer, 2},
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{integer, 3},
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{literal, true},
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{literal, false},
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end_array,
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end_json
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]
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)
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},
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{"simple object", ?_assertEqual(
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encode([
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start_object,
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{key, <<"a">>},
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{literal, true},
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{key, <<"b">>},
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{literal, false},
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end_object,
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end_json
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]),
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[
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start_object,
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{key, <<"a">>},
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{literal, true},
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{key, <<"b">>},
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{literal, false},
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end_object,
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end_json
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]
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)
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},
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{"complex term", ?_assertEqual(
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encode([
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start_object,
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{key, <<"a">>},
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{literal, true},
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{key, <<"b">>},
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{literal, false},
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{key, <<"c">>},
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start_array,
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{integer, 1},
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{integer, 2},
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{integer, 3},
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end_array,
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{key, <<"d">>},
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start_object,
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{key, <<"key">>},
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{string, <<"value">>},
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end_object,
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end_object,
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end_json
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]),
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[
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start_object,
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{key, <<"a">>},
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{literal, true},
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{key, <<"b">>},
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{literal, false},
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{key, <<"c">>},
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start_array,
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{integer, 1},
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{integer, 2},
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{integer, 3},
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end_array,
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{key, <<"d">>},
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start_object,
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{key, <<"key">>},
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{string, <<"value">>},
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end_object,
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end_object,
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end_json
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]
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)
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},
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{"atom keys", ?_assertEqual(
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encode([start_object, {key, key}, {string, <<"value">>}, end_object, end_json]),
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[start_object, {key, <<"key">>}, {string, <<"value">>}, end_object, end_json]
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)}
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].
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encode_failures_test_() ->
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[
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{"unwrapped values", ?_assertEqual(
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{error, badarg},
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encode([{string, <<"a string\n">>}, {string, <<"a string\n">>}, end_json])
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)},
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{"unbalanced array", ?_assertEqual(
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{error, badarg},
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encode([start_array, end_array, end_array, end_json])
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)},
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{"premature finish", ?_assertEqual(
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{error, badarg},
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encode([start_object, {key, <<"key">>, start_array, end_json}])
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)},
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{"really premature finish", ?_assertEqual(
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{error, badarg},
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encode([end_json])
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)}
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].
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escapes_test_() ->
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[
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{"backspace escape", ?_assertEqual(encode(<<"\b">>, [escaped_strings]), [{string, <<"\\b">>}, end_json])},
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{"formfeed escape", ?_assertEqual(encode(<<"\f">>, [escaped_strings]), [{string, <<"\\f">>}, end_json])},
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{"newline escape", ?_assertEqual(encode(<<"\n">>, [escaped_strings]), [{string, <<"\\n">>}, end_json])},
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{"carriage return escape", ?_assertEqual(encode(<<"\r">>, [escaped_strings]), [{string, <<"\\r">>}, end_json])},
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{"tab escape", ?_assertEqual(encode(<<"\t">>, [escaped_strings]), [{string, <<"\\t">>}, end_json])},
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{"quote escape", ?_assertEqual(encode(<<"\"">>, [escaped_strings]), [{string, <<"\\\"">>}, end_json])},
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{"single quote escape", ?_assertEqual(encode(<<"'">>, [escaped_strings, single_quoted_strings]), [{string, <<"\\'">>}, end_json])},
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{"no single quote escape", ?_assertEqual(encode(<<"'">>, [escaped_strings]), [{string, <<"'">>}, end_json])},
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{"forward slash escape", ?_assertEqual(encode(<<"/">>, [escaped_strings, escaped_forward_slashes]), [{string, <<"\\/">>}, end_json])},
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{"no forward slash escape", ?_assertEqual(encode(<<"/">>, [escaped_strings]), [{string, <<"/">>}, end_json])},
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{"back slash escape", ?_assertEqual(encode(<<"\\">>, [escaped_strings]), [{string, <<"\\\\">>}, end_json])},
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{"jsonp escape", ?_assertEqual(
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encode(<<16#2028/utf8, 16#2029/utf8>>, [escaped_strings]),
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[{string, <<"\\u2028\\u2029">>}, end_json]
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)},
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{"no jsonp escape", ?_assertEqual(
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encode(<<16#2028/utf8, 16#2029/utf8>>, [escaped_strings, unescaped_jsonp]),
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[{string, <<16#2028/utf8, 16#2029/utf8>>}, end_json]
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)},
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{"control escape", ?_assertEqual(encode(<<0>>, [escaped_strings]), [{string, <<"\\u0000">>}, end_json])},
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{"dirty strings", ?_assertEqual(encode(<<"\n">>, [escaped_strings, dirty_strings]), [{string, <<"\n">>}, end_json])},
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{"ignore bad escapes", ?_assertEqual(encode(<<"\\x25">>, [escaped_strings, ignored_bad_escapes]), [{string, <<"\\\\x25">>}, end_json])}
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].
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surrogates_test_() ->
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[
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{"surrogates - badarg",
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?_assert(check_bad(surrogates()))
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},
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{"surrogates - replaced",
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?_assert(check_replaced(surrogates()))
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}
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].
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good_characters_test_() ->
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[
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{"acceptable codepoints",
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?_assert(check_good(good()))
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},
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{"acceptable codepoints - escaped_strings",
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?_assert(check_good(good(), [escaped_strings]))
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},
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{"acceptable codepoints - replaced_bad_utf8",
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?_assert(check_good(good(), [escaped_strings]))
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},
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{"acceptable codepoints - escaped_strings + replaced_bad_utf8",
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?_assert(check_good(good(), [escaped_strings, replaced_bad_utf8]))
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},
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{"acceptable extended",
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?_assert(check_good(good_extended()))
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},
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{"acceptable extended - escaped_strings",
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?_assert(check_good(good_extended(), [escaped_strings]))
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},
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{"acceptable extended - escaped_strings",
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?_assert(check_good(good_extended(), [replaced_bad_utf8]))
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}
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].
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reserved_test_() ->
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[
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{"reserved noncharacters - badarg",
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?_assert(check_bad(reserved_space()))
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},
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{"reserved noncharacters - replaced",
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?_assert(check_replaced(reserved_space()))
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}
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].
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noncharacters_test_() ->
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[
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{"noncharacters - badarg",
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?_assert(check_bad(noncharacters()))
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},
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{"noncharacters - replaced",
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?_assert(check_replaced(noncharacters()))
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}
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].
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extended_noncharacters_test_() ->
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[
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{"extended noncharacters - badarg",
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?_assert(check_bad(extended_noncharacters()))
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},
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{"extended noncharacters - replaced",
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?_assert(check_replaced(extended_noncharacters()))
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}
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].
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check_bad(List) ->
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[] == lists:dropwhile(fun({_, {error, badarg}}) -> true ; (_) -> false end,
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check(List, [], [])
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).
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check_replaced(List) ->
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[] == lists:dropwhile(fun({_, [{string, <<16#fffd/utf8>>}|_]}) -> true ; (_) -> false
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end,
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check(List, [replaced_bad_utf8], [])
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).
|
|
|
|
|
|
check_good(List) -> check_good(List, []).
|
|
|
|
check_good(List, Opts) ->
|
|
[] == lists:dropwhile(fun({_, [{string, _}|_]}) -> true ; (_) -> false end,
|
|
check(List, Opts, [])
|
|
).
|
|
|
|
|
|
check([], _Opts, Acc) -> Acc;
|
|
check([H|T], Opts, Acc) ->
|
|
R = encode(to_fake_utf(H, utf8), Opts),
|
|
check(T, Opts, [{H, R}] ++ Acc).
|
|
|
|
|
|
noncharacters() -> lists:seq(16#fffe, 16#ffff).
|
|
|
|
extended_noncharacters() ->
|
|
[16#1fffe, 16#1ffff, 16#2fffe, 16#2ffff]
|
|
++ [16#3fffe, 16#3ffff, 16#4fffe, 16#4ffff]
|
|
++ [16#5fffe, 16#5ffff, 16#6fffe, 16#6ffff]
|
|
++ [16#7fffe, 16#7ffff, 16#8fffe, 16#8ffff]
|
|
++ [16#9fffe, 16#9ffff, 16#afffe, 16#affff]
|
|
++ [16#bfffe, 16#bffff, 16#cfffe, 16#cffff]
|
|
++ [16#dfffe, 16#dffff, 16#efffe, 16#effff]
|
|
++ [16#ffffe, 16#fffff, 16#10fffe, 16#10ffff].
|
|
|
|
surrogates() -> lists:seq(16#d800, 16#dfff).
|
|
|
|
reserved_space() -> lists:seq(16#fdd0, 16#fdef).
|
|
|
|
good() -> lists:seq(16#0000, 16#d7ff) ++ lists:seq(16#e000, 16#fdcf) ++ lists:seq(16#fdf0, 16#fffd).
|
|
|
|
good_extended() -> [16#10000, 16#20000, 16#30000, 16#40000, 16#50000,
|
|
16#60000, 16#70000, 16#80000, 16#90000, 16#a0000,
|
|
16#b0000, 16#c0000, 16#d0000, 16#e0000, 16#f0000
|
|
] ++ lists:seq(16#100000, 16#10fffd).
|
|
|
|
|
|
%% erlang refuses to encode certain codepoints, so fake them all
|
|
to_fake_utf(N, utf8) when N < 16#0080 -> <<N:8>>;
|
|
to_fake_utf(N, utf8) when N < 16#0800 ->
|
|
<<0:5, Y:5, X:6>> = <<N:16>>,
|
|
<<2#110:3, Y:5, 2#10:2, X:6>>;
|
|
to_fake_utf(N, utf8) when N < 16#10000 ->
|
|
<<Z:4, Y:6, X:6>> = <<N:16>>,
|
|
<<2#1110:4, Z:4, 2#10:2, Y:6, 2#10:2, X:6>>;
|
|
to_fake_utf(N, utf8) ->
|
|
<<0:3, W:3, Z:6, Y:6, X:6>> = <<N:24>>,
|
|
<<2#11110:5, W:3, 2#10:2, Z:6, 2#10:2, Y:6, 2#10:2, X:6>>.
|
|
|
|
-endif. |