107 lines
No EOL
3.9 KiB
Erlang
107 lines
No EOL
3.9 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_prettify).
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-author("alisdairsullivan@yahoo.ca").
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-export([pretty/2, jsx_event/2]).
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-record(opts, {
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indent = 4
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}).
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pretty(JSON, Opts) ->
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Init = init(parse_opts(Opts, #opts{})),
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P = jsx:decoder({jsx_prettify, jsx_event, Init}, []),
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case P(JSON) of
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{incomplete, _} -> {error, badjson}
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; {error, badjson} -> {error, badjson}
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; {Result, _} -> Result
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end.
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parse_opts([{indent, Val}|Rest], Opts) ->
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parse_opts(Rest, Opts#opts{indent = Val});
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parse_opts([], Opts) ->
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Opts.
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init(Opts) ->
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{[], Opts#opts.indent, 0, new}.
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jsx_event(start_object, {Acc, Indent, Level, value}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ "{", Indent, Level + 1, new};
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jsx_event(start_object, {Acc, Indent, Level, new}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ "{", Indent, Level + 1, new};
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jsx_event(start_object, {Acc, Indent, Level, _}) ->
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{Acc ++ "{", Indent, Level + 1, new};
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jsx_event(start_array, {Acc, Indent, Level, value}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ "[", Indent, Level + 1, new};
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jsx_event(start_array, {Acc, Indent, Level, new}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ "[", Indent, Level + 1, new};
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jsx_event(start_array, {Acc, Indent, Level, _}) ->
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{Acc ++ "[", Indent, Level + 1, new};
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jsx_event(end_object, {Acc, Indent, Level, value}) ->
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{Acc ++ "\n" ++ indent(Indent, Level - 1) ++ "}", Indent, Level - 1, value};
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jsx_event(end_object, {Acc, Indent, Level, new}) ->
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{Acc ++ "}", Indent, Level - 1, value};
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jsx_event(end_array, {Acc, Indent, Level, value}) ->
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{Acc ++ "\n" ++ indent(Indent, Level - 1) ++ "]", Indent, Level - 1, value};
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jsx_event(end_array, {Acc, Indent, Level, new}) ->
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{Acc ++ "]", Indent, Level - 1, value};
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jsx_event({key, Key}, {Acc, Indent, Level, value}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ "\"" ++ Key ++ "\": ", Indent, Level, key};
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jsx_event({key, Key}, {Acc, Indent, Level, _}) ->
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{Acc ++ "\n" ++ indent(Indent, Level) ++ "\"" ++ Key ++ "\": ", Indent, Level, key};
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jsx_event({Type, Value}, {Acc, Indent, Level, value}) ->
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{Acc ++ ",\n" ++ indent(Indent, Level) ++ format(Type, Value), Indent, Level, value};
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jsx_event({Type, Value}, {Acc, Indent, Level, new}) ->
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{Acc ++ "\n" ++ indent(Indent, Level) ++ format(Type, Value), Indent, Level, value};
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jsx_event({Type, Value}, {Acc, Indent, Level, key}) ->
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{Acc ++ format(Type, Value), Indent, Level, value};
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jsx_event(reset, {_, Indent, _, _}) ->
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{[], Indent, 0, new};
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jsx_event(end_of_json, {Acc, _, _, _}) ->
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Acc.
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format(string, String) ->
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"\"" ++ String ++ "\"";
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format(literal, Literal) ->
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erlang:atom_to_list(Literal);
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format(_, Number) ->
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Number.
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indent(Indent, Level) ->
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[ 16#20 || _ <- lists:seq(1, Indent * Level) ].
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