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81 | |
81 | |
82 | package JSON::XS; |
82 | package JSON::XS; |
83 | |
83 | |
84 | use strict; |
84 | use strict; |
85 | |
85 | |
86 | our $VERSION = '1.4'; |
86 | our $VERSION = '1.5'; |
87 | our @ISA = qw(Exporter); |
87 | our @ISA = qw(Exporter); |
88 | |
88 | |
89 | our @EXPORT = qw(to_json from_json); |
89 | our @EXPORT = qw(to_json from_json); |
90 | |
90 | |
91 | use Exporter; |
91 | use Exporter; |
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278 | |
278 | |
279 | Example, space_before and indent disabled, space_after enabled: |
279 | Example, space_before and indent disabled, space_after enabled: |
280 | |
280 | |
281 | {"key": "value"} |
281 | {"key": "value"} |
282 | |
282 | |
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283 | =item $json = $json->relaxed ([$enable]) |
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284 | |
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285 | If C<$enable> is true (or missing), then C<decode> will accept some |
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286 | extensions to normal JSON syntax (see below). C<encode> will not be |
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287 | affected in anyway. I<Be aware that this option makes you accept invalid |
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288 | JSON texts as if they were valid!>. I suggest only to use this option to |
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289 | parse application-specific files written by humans (configuration files, |
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290 | resource files etc.) |
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291 | |
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292 | If C<$enable> is false (the default), then C<decode> will only accept |
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293 | valid JSON texts. |
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294 | |
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295 | Currently accepted extensions are: |
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296 | |
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297 | =over 4 |
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298 | |
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299 | =item * list items can have an end-comma |
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300 | |
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301 | JSON I<separates> array elements and key-value pairs with commas. This |
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302 | can be annoying if you write JSON texts manually and want to be able to |
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303 | quickly append elements, so this extension accepts comma at the end of |
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304 | such items not just between them: |
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305 | |
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306 | [ |
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307 | 1, |
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308 | 2, <- this comma not normally allowed |
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309 | ] |
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310 | { |
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311 | "k1": "v1", |
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312 | "k2": "v2", <- this comma not normally allowed |
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313 | } |
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314 | |
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315 | =item * shell-style '#'-comments |
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316 | |
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317 | Whenever JSON allows whitespace, shell-style comments are additionally |
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318 | allowed. They are terminated by the first carriage-return or line-feed |
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319 | character, after which more white-space and comments are allowed. |
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320 | |
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321 | [ |
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322 | 1, # this comment not allowed in JSON |
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323 | # neither this one... |
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324 | ] |
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325 | |
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326 | =back |
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327 | |
283 | =item $json = $json->canonical ([$enable]) |
328 | =item $json = $json->canonical ([$enable]) |
284 | |
329 | |
285 | If C<$enable> is true (or missing), then the C<encode> method will output JSON objects |
330 | If C<$enable> is true (or missing), then the C<encode> method will output JSON objects |
286 | by sorting their keys. This is adding a comparatively high overhead. |
331 | by sorting their keys. This is adding a comparatively high overhead. |
287 | |
332 | |
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348 | enabled by this setting. |
393 | enabled by this setting. |
349 | |
394 | |
350 | If C<$enable> is false, then the C<allow_blessed> setting will decide what |
395 | If C<$enable> is false, then the C<allow_blessed> setting will decide what |
351 | to do when a blessed object is found. |
396 | to do when a blessed object is found. |
352 | |
397 | |
353 | =item $json = $json->filter_json_object ([$coderef]) |
398 | =item $json = $json->filter_json_object ([$coderef->($hashref)]) |
354 | |
399 | |
355 | When C<$coderef> is specified, it will be called from C<decode> each |
400 | When C<$coderef> is specified, it will be called from C<decode> each |
356 | time it decodes a JSON object. The only argument is a reference to the |
401 | time it decodes a JSON object. The only argument is a reference to the |
357 | newly-created hash. If the code references returns a single scalar (which |
402 | newly-created hash. If the code references returns a single scalar (which |
358 | need not be a reference), this value (i.e. a copy of that scalar to avoid |
403 | need not be a reference), this value (i.e. a copy of that scalar to avoid |
359 | aliasing) is inserted into the deserialised data structure. If it returns |
404 | aliasing) is inserted into the deserialised data structure. If it returns |
360 | an empty list (NOTE: I<not> C<undef>, which is a valid scalar), the |
405 | an empty list (NOTE: I<not> C<undef>, which is a valid scalar), the |
361 | original deserialised hash will be inserted. This setting can slow down |
406 | original deserialised hash will be inserted. This setting can slow down |
362 | decoding considerably. |
407 | decoding considerably. |
363 | |
408 | |
364 | When C<$coderef> is omitted or undefined, C<decode> will not change the |
409 | When C<$coderef> is omitted or undefined, any existing callback will |
365 | deserialised hash in any way. This is maximally fast. |
410 | be removed and C<decode> will not change the deserialised hash in any |
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411 | way. |
366 | |
412 | |
367 | Example, convert all JSON objects into the integer 5: |
413 | Example, convert all JSON objects into the integer 5: |
368 | |
414 | |
369 | my $js = JSON::XS->new->filter_json_object (sub { 5 }); |
415 | my $js = JSON::XS->new->filter_json_object (sub { 5 }); |
370 | # returns [5] |
416 | # returns [5] |
371 | $js->decode ('[{}]') |
417 | $js->decode ('[{}]') |
372 | # throw an exception because allow_nonref is not enabled: |
418 | # throw an exception because allow_nonref is not enabled |
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419 | # so a lone 5 is not allowed. |
373 | $js->decode ('{"a":1, "b":2}'); |
420 | $js->decode ('{"a":1, "b":2}'); |
374 | |
421 | |
375 | =item $json = $json->filter_json_single_key_object ([$coderef]) |
422 | =item $json = $json->filter_json_single_key_object ($key [=> $coderef->($value)]) |
376 | |
423 | |
377 | Works like C<filter_json_object>, but is only called for JSON objects |
424 | Works remotely similar to C<filter_json_object>, but is only called for |
378 | having only a single key. |
425 | JSON objects having a single key named C<$key>. |
379 | |
426 | |
380 | This C<$coderef> is called before the one specified via |
427 | This C<$coderef> is called before the one specified via |
381 | C<filter_json_object>, if any. If it returns something, that will be |
428 | C<filter_json_object>, if any. It gets passed the single value in the JSON |
382 | inserted into the data structure. If it returns nothing, the callback |
429 | object. If it returns a single value, it will be inserted into the data |
383 | from C<filter_json_object> will be called next. If you want to force |
430 | structure. If it returns nothing (not even C<undef> but the empty list), |
384 | insertion of single-key objects even in the presence of a mutating |
431 | the callback from C<filter_json_object> will be called next, as if no |
385 | C<filter_json_object> callback, simply return the passed hash. |
432 | single-key callback were specified. |
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433 | |
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434 | If C<$coderef> is omitted or undefined, the corresponding callback will be |
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435 | disabled. There can only ever be one callback for a given key. |
386 | |
436 | |
387 | As this callback gets called less often then the C<filter_json_object> |
437 | As this callback gets called less often then the C<filter_json_object> |
388 | one, decoding speed will not usually suffer as much. Therefore, single-key |
438 | one, decoding speed will not usually suffer as much. Therefore, single-key |
389 | objects make excellent targets to serialise Perl objects into, especially |
439 | objects make excellent targets to serialise Perl objects into, especially |
390 | as single-key JSON objects are as close to the type-tagged value concept |
440 | as single-key JSON objects are as close to the type-tagged value concept |
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401 | into the corresponding C<< $WIDGET{<id>} >> object: |
451 | into the corresponding C<< $WIDGET{<id>} >> object: |
402 | |
452 | |
403 | # return whatever is in $WIDGET{5}: |
453 | # return whatever is in $WIDGET{5}: |
404 | JSON::XS |
454 | JSON::XS |
405 | ->new |
455 | ->new |
406 | ->filter_json_single_key_object (sub { |
456 | ->filter_json_single_key_object (__widget__ => sub { |
407 | exists $_[0]{__widget__} |
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408 | ? $WIDGET{ $_[0]{__widget__} } |
457 | $WIDGET{ $_[0] } |
409 | : () |
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410 | }) |
458 | }) |
411 | ->decode ('{"__widget__": 5') |
459 | ->decode ('{"__widget__": 5') |
412 | |
460 | |
413 | # this can be used with a TO_JSON method in some "widget" class |
461 | # this can be used with a TO_JSON method in some "widget" class |
414 | # for serialisation to json: |
462 | # for serialisation to json: |
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550 | are represented by the same codepoints in the Perl string, so no manual |
598 | are represented by the same codepoints in the Perl string, so no manual |
551 | decoding is necessary. |
599 | decoding is necessary. |
552 | |
600 | |
553 | =item number |
601 | =item number |
554 | |
602 | |
555 | A JSON number becomes either an integer or numeric (floating point) |
603 | A JSON number becomes either an integer, numeric (floating point) or |
556 | scalar in perl, depending on its range and any fractional parts. On the |
604 | string scalar in perl, depending on its range and any fractional parts. On |
557 | Perl level, there is no difference between those as Perl handles all the |
605 | the Perl level, there is no difference between those as Perl handles all |
558 | conversion details, but an integer may take slightly less memory and might |
606 | the conversion details, but an integer may take slightly less memory and |
559 | represent more values exactly than (floating point) numbers. |
607 | might represent more values exactly than (floating point) numbers. |
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608 | |
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609 | If the number consists of digits only, JSON::XS will try to represent |
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610 | it as an integer value. If that fails, it will try to represent it as |
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611 | a numeric (floating point) value if that is possible without loss of |
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612 | precision. Otherwise it will preserve the number as a string value. |
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613 | |
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614 | Numbers containing a fractional or exponential part will always be |
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615 | represented as numeric (floating point) values, possibly at a loss of |
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616 | precision. |
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617 | |
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618 | This might create round-tripping problems as numbers might become strings, |
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619 | but as Perl is typeless there is no other way to do it. |
560 | |
620 | |
561 | =item true, false |
621 | =item true, false |
562 | |
622 | |
563 | These JSON atoms become C<JSON::XS::true> and C<JSON::XS::false>, |
623 | These JSON atoms become C<JSON::XS::true> and C<JSON::XS::false>, |
564 | respectively. They are overloaded to act almost exactly like the numbers |
624 | respectively. They are overloaded to act almost exactly like the numbers |
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606 | to_json [\0,JSON::XS::true] # yields [false,true] |
666 | to_json [\0,JSON::XS::true] # yields [false,true] |
607 | |
667 | |
608 | =item JSON::XS::true, JSON::XS::false |
668 | =item JSON::XS::true, JSON::XS::false |
609 | |
669 | |
610 | These special values become JSON true and JSON false values, |
670 | These special values become JSON true and JSON false values, |
611 | respectively. You cna alos use C<\1> and C<\0> directly if you want. |
671 | respectively. You can also use C<\1> and C<\0> directly if you want. |
612 | |
672 | |
613 | =item blessed objects |
673 | =item blessed objects |
614 | |
674 | |
615 | Blessed objects are not allowed. JSON::XS currently tries to encode their |
675 | Blessed objects are not allowed. JSON::XS currently tries to encode their |
616 | underlying representation (hash- or arrayref), but this behaviour might |
676 | underlying representation (hash- or arrayref), but this behaviour might |
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875 | still relatively early in its development. If you keep reporting bugs they |
935 | still relatively early in its development. If you keep reporting bugs they |
876 | will be fixed swiftly, though. |
936 | will be fixed swiftly, though. |
877 | |
937 | |
878 | =cut |
938 | =cut |
879 | |
939 | |
880 | our $true = do { bless \(my $dummy = "1"), "JSON::XS::Boolean" }; |
940 | our $true = do { bless \(my $dummy = 1), "JSON::XS::Boolean" }; |
881 | our $false = do { bless \(my $dummy = "0"), "JSON::XS::Boolean" }; |
941 | our $false = do { bless \(my $dummy = 0), "JSON::XS::Boolean" }; |
882 | |
942 | |
883 | sub true() { $true } |
943 | sub true() { $true } |
884 | sub false() { $false } |
944 | sub false() { $false } |
885 | |
945 | |
886 | sub is_bool($) { |
946 | sub is_bool($) { |