remove license replication from include files, move json_escape/2 to jsx_utils
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alisdair sullivan
parent
0d72a07aa7
commit
59a983bbe9
8 changed files with 180 additions and 274 deletions
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@ -23,7 +23,9 @@
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-module(jsx_utils).
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-export([nice_decimal/1]).
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-export([nice_decimal/1, json_escape/2]).
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-include("../include/jsx_opts.hrl").
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%% conversion of floats to 'nice' decimal output. erlang's float implementation
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@ -152,17 +154,108 @@ digits_to_list(Digits, 0, Acc) ->
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digits_to_list(Digits, ignore, "." ++ Acc);
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digits_to_list([Digit|Digits], Dpoint, Acc) ->
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digits_to_list(Digits,
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case Dpoint of ignore -> ignore; X -> X - 1 end, to_ascii(Digit) ++ Acc
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case Dpoint of ignore -> ignore; X -> X - 1 end, [to_hex(Digit)] ++ Acc
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).
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to_ascii(10) -> "a";
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to_ascii(11) -> "b";
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to_ascii(12) -> "c";
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to_ascii(13) -> "d";
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to_ascii(14) -> "e";
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to_ascii(15) -> "f";
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to_ascii(X) -> [X + 48]. %% ascii "1" is [49], "2" is [50], etc...
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%% json string escaping, for utf8 binaries. escape the json control sequences to
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%% their json equivalent, escape other control characters to \uXXXX sequences,
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%% everything else should be a legal json string component
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json_escape(String, Opts) when is_binary(String) ->
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json_escape(String, Opts, <<>>);
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json_escape(String, Opts) when is_list(String) ->
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json_escape(String, Opts, []).
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%% double quote
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json_escape(<<$\", Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $\">>);
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json_escape([$\"|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$\", $\\] ++ Acc);
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%% backslash \ reverse solidus
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json_escape(<<$\\, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $\\>>);
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json_escape([$\\|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$\\, $\\] ++ Acc);
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%% backspace
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json_escape(<<$\b, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $b>>);
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json_escape([$\b|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$b, $\\] ++ Acc);
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%% form feed
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json_escape(<<$\f, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $f>>);
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json_escape([$\f|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$f, $\\] ++ Acc);
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%% newline
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json_escape(<<$\n, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $n>>);
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json_escape([$\n|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$n, $\\] ++ Acc);
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%% cr
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json_escape(<<$\r, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $r>>);
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json_escape([$\r|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$r, $\\] ++ Acc);
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%% tab
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json_escape(<<$\t, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $t>>);
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json_escape([$\t|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [$t, $\\] ++ Acc);
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%% other control characters
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json_escape(<<C/utf8, Rest/binary>>, Opts, Acc) when C >= 0, C < $\s ->
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json_escape(Rest,
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Opts,
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<<Acc/binary,
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(unicode:characters_to_binary(json_escape_sequence(C)))/binary
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>>
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);
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json_escape([C|Rest], Opts, Acc) when C >= 0, C < $\s ->
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json_escape(Rest, Opts, lists:reverse(json_escape_sequence(C)) ++ Acc);
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%% escape forward slashes -- optionally -- to faciliate microsoft's retarded
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%% date format
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json_escape(<<$/, Rest/binary>>, Opts=#opts{escape_forward_slash=true}, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, $\\, $/>>);
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json_escape([$/|Rest], Opts=#opts{escape_forward_slash=true}, Acc) ->
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json_escape(Rest, Opts, [$/, $\\] ++ Acc);
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%% escape u+2028 and u+2029 to avoid problems with jsonp
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json_escape(<<C/utf8, Rest/binary>>, Opts, Acc)
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when C == 16#2028; C == 16#2029 ->
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json_escape(Rest,
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Opts,
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<<Acc/binary,
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(unicode:characters_to_binary(json_escape_sequence(C)))/binary
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>>
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);
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json_escape([C|Rest], Opts, Acc) when C =:= 16#2028; C =:= 16#2029 ->
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json_escape(Rest, Opts, lists:reverse(json_escape_sequence(C)) ++ Acc);
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%% any other legal codepoint
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json_escape(<<C/utf8, Rest/binary>>, Opts, Acc) ->
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json_escape(Rest, Opts, <<Acc/binary, C/utf8>>);
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json_escape([C|Rest], Opts, Acc) ->
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json_escape(Rest, Opts, [C] ++ Acc);
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json_escape(<<>>, _Opts, Acc) ->
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Acc;
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json_escape([], _Opts, Acc) ->
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lists:reverse(Acc);
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json_escape(Rest, Opts, Acc) ->
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erlang:error(badarg, [Rest, Opts, Acc]).
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%% convert a codepoint to it's \uXXXX equiv.
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json_escape_sequence(X) ->
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<<A:4, B:4, C:4, D:4>> = <<X:16>>,
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[$\\, $u, (to_hex(A)), (to_hex(B)), (to_hex(C)), (to_hex(D))].
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to_hex(10) -> $a;
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to_hex(11) -> $b;
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to_hex(12) -> $c;
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to_hex(13) -> $d;
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to_hex(14) -> $e;
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to_hex(15) -> $f;
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to_hex(X) -> X + 48. %% ascii "1" is [49], "2" is [50], etc...
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%% eunit tests
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@ -206,4 +299,62 @@ nice_decimal_test_() ->
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}
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].
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binary_escape_test_() ->
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[
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{"json string escaping",
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?_assert(json_escape(
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<<"\"\\\b\f\n\r\t">>, #opts{}
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) =:= <<"\\\"\\\\\\b\\f\\n\\r\\t">>
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)
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},
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{"json string hex escape",
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?_assert(json_escape(
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<<1, 2, 3, 11, 26, 30, 31>>, #opts{}
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) =:= <<"\\u0001\\u0002\\u0003\\u000b\\u001a\\u001e\\u001f">>
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)
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},
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{"jsonp protection",
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?_assert(json_escape(
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<<226, 128, 168, 226, 128, 169>>, #opts{}
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) =:= <<"\\u2028\\u2029">>
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)
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},
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{"microsoft i hate your date format",
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?_assert(json_escape(<<"/Date(1303502009425)/">>,
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#opts{escape_forward_slash=true}
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) =:= <<"\\/Date(1303502009425)\\/">>
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)
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}
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].
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string_escape_test_() ->
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[
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{"json string escaping",
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?_assert(json_escape(
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"\"\\\b\f\n\r\t", #opts{}
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) =:= "\\\"\\\\\\b\\f\\n\\r\\t"
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)
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},
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{"json string hex escape",
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?_assert(json_escape(
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[1, 2, 3, 11, 26, 30, 31], #opts{}
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) =:= "\\u0001\\u0002\\u0003\\u000b\\u001a\\u001e\\u001f"
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)
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},
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{"jsonp protection",
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?_assert(json_escape(
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[16#2028, 16#2029], #opts{}
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) =:= "\\u2028\\u2029"
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)
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},
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{"microsoft i hate your date format",
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?_assert(json_escape("/Date(1303502009425)/",
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#opts{escape_forward_slash=true}
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) =:= "\\/Date(1303502009425)\\/"
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)
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}
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].
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-endif.
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