[ViewVC] Diff of: cvs/JSON-XS/XS.pm

Comparing JSON-XS/XS.pm (file contents):
Revision 1.116 by root, Tue Feb 17 23:41:20 2009 UTC vs.
Revision 1.129 by root, Tue Jan 19 01:02:19 2010 UTC

 =cut
 package JSON::XS;
-no warnings;
+use common::sense;
-use strict;
-our $VERSION = '2.232';
+our $VERSION = '2.28';
 our @ISA = qw(Exporter);
 our @EXPORT = qw(encode_json decode_json to_json from_json);
 sub to_json($) {
 the same JSON text (given the same overall settings). If it is disabled,
 the same hash might be encoded differently even if contains the same data,
 as key-value pairs have no inherent ordering in Perl.
 This setting has no effect when decoding JSON texts.
+This setting has currently no effect on tied hashes.
 =item $json = $json->allow_nonref ([$enable])
 =item $enabled = $json->get_allow_nonref
    use JSON::XS;
    print encode_json [chr 0x2028];
 The right fix for this is to use a proper JSON parser in your javascript
-programs, and not rely on C<eval>.
+programs, and not rely on C<eval> (see for example Douglas Crockford's
+F<json2.js> parser).
 If this is not an option, you can, as a stop-gap measure, simply encode to
 ASCII-only JSON:
    use JSON::XS;
    print JSON::XS->new->ascii->encode ([chr 0x2028]);
-And if you are concerned about the size of the resulting JSON text, you
+Note that this will enlarge the resulting JSON text quite a bit if you
-can run some regexes to only escape U+2028 and U+2029:
+have many non-ASCII characters. You might be tempted to run some regexes
+to only escape U+2028 and U+2029, e.g.:
-   use JSON::XS;
+   # DO NOT USE THIS!
    my $json = JSON::XS->new->utf8->encode ([chr 0x2028]);
    $json =~ s/\xe2\x80\xa8/\\u2028/g; # escape U+2028
    $json =~ s/\xe2\x80\xa9/\\u2029/g; # escape U+2029
    print $json;
-This works because U+2028/U+2029 are not allowed outside of strings and
+Note that I<this is a bad idea>: the above only works for U+2028 and
-are not used for syntax, so replacing them unconditionally just works.
-Note, however, that fixing the broken JSON parser is better than working
-around it in every other generator. The above regexes should work well in
-other languages, as long as they operate on UTF-8. It is equally valid to
-replace all occurences of U+2028/2029 directly by their \\u-escaped forms
-in unicode texts, so they can simply be used to fix any parsers relying on
-C<eval> by first applying the regexes on the encoded texts.
-Note also that the above only works for U+2028 and U+2029 and thus
-only for fully ECMAscript-compliant parsers. Many existing javascript
+U+2029 and thus only for fully ECMAscript-compliant parsers. Many existing
-implementations misparse other characters as well. Best rely on a good
+javascript implementations, however, have issues with other characters as
-JSON parser, such as Douglas Crockfords F<json2.js>, which escapes the
+well - using C<eval> naively simply I<will> cause problems.
-above and many more problematic characters properly before passing them
-into C<eval>.
 Another problem is that some javascript implementations reserve
 some property names for their own purposes (which probably makes
 them non-ECMAscript-compliant). For example, Iceweasel reserves the
 C<__proto__> property name for it's own purposes.
    my $yaml = $to_yaml->encode ($ref) . "\n";
 This will I<usually> generate JSON texts that also parse as valid
 YAML. Please note that YAML has hardcoded limits on (simple) object key
 lengths that JSON doesn't have and also has different and incompatible
-unicode handling, so you should make sure that your hash keys are
+unicode character escape syntax, so you should make sure that your hash
-noticeably shorter than the 1024 "stream characters" YAML allows and that
+keys are noticeably shorter than the 1024 "stream characters" YAML allows
-you do not have characters with codepoint values outside the Unicode BMP
+and that you do not have characters with codepoint values outside the
-(basic multilingual page). YAML also does not allow C<\/> sequences in
+Unicode BMP (basic multilingual page). YAML also does not allow C<\/>
-strings (which JSON::XS does not I<currently> generate, but other JSON
+sequences in strings (which JSON::XS does not I<currently> generate, but
-generators might).
+other JSON generators might).
 There might be other incompatibilities that I am not aware of (or the YAML
 specification has been changed yet again - it does so quite often). In
 general you should not try to generate YAML with a JSON generator or vice
 versa, or try to parse JSON with a YAML parser or vice versa: chances are
 that difficult or long) and finally make YAML compatible to it, and
 educating users about the changes, instead of spreading lies about the
 real compatibility for many I<years> and trying to silence people who
 point out that it isn't true.
+Addendum/2009: the YAML 1.2 spec is still incomaptible with JSON, even
+though the incompatibilities have been documented (and are known to
+Brian) for many years and the spec makes explicit claims that YAML is a
+superset of JSON. It would be so easy to fix, but apparently, bullying and
+corrupting userdata is so much easier.
 =back
 =head2 SPEED
 a very short single-line JSON string (also available at
 L<http://dist.schmorp.de/misc/json/short.json>).
    {"method": "handleMessage", "params": ["user1",
    "we were just talking"], "id": null, "array":[1,11,234,-5,1e5,1e7,
-   true,  false]}
+   1,  0]}
 It shows the number of encodes/decodes per second (JSON::XS uses
 the functional interface, while JSON::XS/2 uses the OO interface
 with pretty-printing and hashkey sorting enabled, JSON::XS/3 enables
-shrink). Higher is better:
+shrink. JSON::DWIW/DS uses the deserialise function, while JSON::DWIW::FJ
+uses the from_json method). Higher is better:
-   module     |     encode |     decode |
+   module        |     encode |     decode |
-   -----------|------------|------------|
+   --------------|------------|------------|
-   JSON 1.x   |   4990.842 |   4088.813 |
+   JSON::DWIW/DS |  86302.551 | 102300.098 |
-   JSON::DWIW |  51653.990 |  71575.154 |
+   JSON::DWIW/FJ |  86302.551 |  75983.768 |
-   JSON::PC   |  65948.176 |  74631.744 |
+   JSON::PP      |  15827.562 |   6638.658 |
-   JSON::PP   |   8931.652 |   3817.168 |
+   JSON::Syck    |  63358.066 |  47662.545 |
-   JSON::Syck |  24877.248 |  27776.848 |
+   JSON::XS      | 511500.488 | 511500.488 |
-   JSON::XS   | 388361.481 | 227951.304 |
+   JSON::XS/2    | 291271.111 | 388361.481 |
-   JSON::XS/2 | 227951.304 | 218453.333 |
+   JSON::XS/3    | 361577.931 | 361577.931 |
-   JSON::XS/3 | 338250.323 | 218453.333 |
+   Storable      |  66788.280 | 265462.278 |
-   Storable   |  16500.016 | 135300.129 |
-   -----------+------------+------------+
+   --------------+------------+------------+
-That is, JSON::XS is about five times faster than JSON::DWIW on encoding,
+That is, JSON::XS is almost six times faster than JSON::DWIW on encoding,
-about three times faster on decoding, and over forty times faster
+about five times faster on decoding, and over thirty to seventy times
-than JSON, even with pretty-printing and key sorting. It also compares
+faster than JSON's pure perl implementation. It also compares favourably
-favourably to Storable for small amounts of data.
+to Storable for small amounts of data.
 Using a longer test string (roughly 18KB, generated from Yahoo! Locals
 search API (L<http://dist.schmorp.de/misc/json/long.json>).
-   module     |     encode |     decode |
+   module        |     encode |     decode |
-   -----------|------------|------------|
+   --------------|------------|------------|
-   JSON 1.x   |     55.260 |     34.971 |
+   JSON::DWIW/DS |   1647.927 |   2673.916 |
-   JSON::DWIW |    825.228 |   1082.513 |
+   JSON::DWIW/FJ |   1630.249 |   2596.128 |
-   JSON::PC   |   3571.444 |   2394.829 |
-   JSON::PP   |    210.987 |     32.574 |
+   JSON::PP      |    400.640 |     62.311 |
-   JSON::Syck |    552.551 |    787.544 |
+   JSON::Syck    |   1481.040 |   1524.869 |
-   JSON::XS   |   5780.463 |   4854.519 |
+   JSON::XS      |  20661.596 |   9541.183 |
-   JSON::XS/2 |   3869.998 |   4798.975 |
+   JSON::XS/2    |  10683.403 |   9416.938 |
-   JSON::XS/3 |   5862.880 |   4798.975 |
+   JSON::XS/3    |  20661.596 |   9400.054 |
-   Storable   |   4445.002 |   5235.027 |
+   Storable      |  19765.806 |  10000.725 |
-   -----------+------------+------------+
+   --------------+------------+------------+
 Again, JSON::XS leads by far (except for Storable which non-surprisingly
-decodes faster).
+decodes a bit faster).
 On large strings containing lots of high Unicode characters, some modules
 (such as JSON::PC) seem to decode faster than JSON::XS, but the result
 will be broken due to missing (or wrong) Unicode handling. Others refuse
 to decode or encode properly, so it was impossible to prepare a fair
 information you might want to make sure that exceptions thrown by JSON::XS
 will not end up in front of untrusted eyes.
 If you are using JSON::XS to return packets to consumption
 by JavaScript scripts in a browser you should have a look at
-L<http://jpsykes.com/47/practical-csrf-and-json-security> to see whether
+L<http://blog.archive.jpsykes.com/47/practical-csrf-and-json-security/> to
-you are vulnerable to some common attack vectors (which really are browser
+see whether you are vulnerable to some common attack vectors (which really
-design bugs, but it is still you who will have to deal with it, as major
+are browser design bugs, but it is still you who will have to deal with
-browser developers care only for features, not about getting security
+it, as major browser developers care only for features, not about getting
-right).
+security right).
 =head1 THREADS
 This module is I<not> guaranteed to be thread safe and there are no

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Comparing JSON-XS/XS.pm (file contents): Revision 1.116 by root, Tue Feb 17 23:41:20 2009 UTC vs. Revision 1.129 by root, Tue Jan 19 01:02:19 2010 UTC

Diff Legend

Comparing JSON-XS/XS.pm (file contents):
Revision 1.116 by root, Tue Feb 17 23:41:20 2009 UTC vs.
Revision 1.129 by root, Tue Jan 19 01:02:19 2010 UTC