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| 1 package JSON; | |
| 2 | |
| 3 | |
| 4 use strict; | |
| 5 use Carp (); | |
| 6 use base qw(Exporter); | |
| 7 @JSON::EXPORT = qw(from_json to_json jsonToObj objToJson encode_json decode_json
); | |
| 8 | |
| 9 BEGIN { | |
| 10 $JSON::VERSION = '2.59'; | |
| 11 $JSON::DEBUG = 0 unless (defined $JSON::DEBUG); | |
| 12 $JSON::DEBUG = $ENV{ PERL_JSON_DEBUG } if exists $ENV{ PERL_JSON_DEBUG }; | |
| 13 } | |
| 14 | |
| 15 my $Module_XS = 'JSON::XS'; | |
| 16 my $Module_PP = 'JSON::PP'; | |
| 17 my $Module_bp = 'JSON::backportPP'; # included in JSON distribution | |
| 18 my $PP_Version = '2.27200'; | |
| 19 my $XS_Version = '2.34'; | |
| 20 | |
| 21 | |
| 22 # XS and PP common methods | |
| 23 | |
| 24 my @PublicMethods = qw/ | |
| 25 ascii latin1 utf8 pretty indent space_before space_after relaxed canonical a
llow_nonref | |
| 26 allow_blessed convert_blessed filter_json_object filter_json_single_key_obje
ct | |
| 27 shrink max_depth max_size encode decode decode_prefix allow_unknown | |
| 28 /; | |
| 29 | |
| 30 my @Properties = qw/ | |
| 31 ascii latin1 utf8 indent space_before space_after relaxed canonical allow_no
nref | |
| 32 allow_blessed convert_blessed shrink max_depth max_size allow_unknown | |
| 33 /; | |
| 34 | |
| 35 my @XSOnlyMethods = qw//; # Currently nothing | |
| 36 | |
| 37 my @PPOnlyMethods = qw/ | |
| 38 indent_length sort_by | |
| 39 allow_singlequote allow_bignum loose allow_barekey escape_slash as_nonblesse
d | |
| 40 /; # JSON::PP specific | |
| 41 | |
| 42 | |
| 43 # used in _load_xs and _load_pp ($INSTALL_ONLY is not used currently) | |
| 44 my $_INSTALL_DONT_DIE = 1; # When _load_xs fails to load XS, don't die. | |
| 45 my $_INSTALL_ONLY = 2; # Don't call _set_methods() | |
| 46 my $_ALLOW_UNSUPPORTED = 0; | |
| 47 my $_UNIV_CONV_BLESSED = 0; | |
| 48 my $_USSING_bpPP = 0; | |
| 49 | |
| 50 | |
| 51 # Check the environment variable to decide worker module. | |
| 52 | |
| 53 unless ($JSON::Backend) { | |
| 54 $JSON::DEBUG and Carp::carp("Check used worker module..."); | |
| 55 | |
| 56 my $backend = exists $ENV{PERL_JSON_BACKEND} ? $ENV{PERL_JSON_BACKEND} : 1; | |
| 57 | |
| 58 if ($backend eq '1' or $backend =~ /JSON::XS\s*,\s*JSON::PP/) { | |
| 59 _load_xs($_INSTALL_DONT_DIE) or _load_pp(); | |
| 60 } | |
| 61 elsif ($backend eq '0' or $backend eq 'JSON::PP') { | |
| 62 _load_pp(); | |
| 63 } | |
| 64 elsif ($backend eq '2' or $backend eq 'JSON::XS') { | |
| 65 _load_xs(); | |
| 66 } | |
| 67 elsif ($backend eq 'JSON::backportPP') { | |
| 68 $_USSING_bpPP = 1; | |
| 69 _load_pp(); | |
| 70 } | |
| 71 else { | |
| 72 Carp::croak "The value of environmental variable 'PERL_JSON_BACKEND' is
invalid."; | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 | |
| 77 sub import { | |
| 78 my $pkg = shift; | |
| 79 my @what_to_export; | |
| 80 my $no_export; | |
| 81 | |
| 82 for my $tag (@_) { | |
| 83 if ($tag eq '-support_by_pp') { | |
| 84 if (!$_ALLOW_UNSUPPORTED++) { | |
| 85 JSON::Backend::XS | |
| 86 ->support_by_pp(@PPOnlyMethods) if ($JSON::Backend eq $Modul
e_XS); | |
| 87 } | |
| 88 next; | |
| 89 } | |
| 90 elsif ($tag eq '-no_export') { | |
| 91 $no_export++, next; | |
| 92 } | |
| 93 elsif ( $tag eq '-convert_blessed_universally' ) { | |
| 94 eval q| | |
| 95 require B; | |
| 96 *UNIVERSAL::TO_JSON = sub { | |
| 97 my $b_obj = B::svref_2object( $_[0] ); | |
| 98 return $b_obj->isa('B::HV') ? { %{ $_[0] } } | |
| 99 : $b_obj->isa('B::AV') ? [ @{ $_[0] } ] | |
| 100 : undef | |
| 101 ; | |
| 102 } | |
| 103 | if ( !$_UNIV_CONV_BLESSED++ ); | |
| 104 next; | |
| 105 } | |
| 106 push @what_to_export, $tag; | |
| 107 } | |
| 108 | |
| 109 return if ($no_export); | |
| 110 | |
| 111 __PACKAGE__->export_to_level(1, $pkg, @what_to_export); | |
| 112 } | |
| 113 | |
| 114 | |
| 115 # OBSOLETED | |
| 116 | |
| 117 sub jsonToObj { | |
| 118 my $alternative = 'from_json'; | |
| 119 if (defined $_[0] and UNIVERSAL::isa($_[0], 'JSON')) { | |
| 120 shift @_; $alternative = 'decode'; | |
| 121 } | |
| 122 Carp::carp "'jsonToObj' will be obsoleted. Please use '$alternative' instead
."; | |
| 123 return JSON::from_json(@_); | |
| 124 }; | |
| 125 | |
| 126 sub objToJson { | |
| 127 my $alternative = 'to_json'; | |
| 128 if (defined $_[0] and UNIVERSAL::isa($_[0], 'JSON')) { | |
| 129 shift @_; $alternative = 'encode'; | |
| 130 } | |
| 131 Carp::carp "'objToJson' will be obsoleted. Please use '$alternative' instead
."; | |
| 132 JSON::to_json(@_); | |
| 133 }; | |
| 134 | |
| 135 | |
| 136 # INTERFACES | |
| 137 | |
| 138 sub to_json ($@) { | |
| 139 if ( | |
| 140 ref($_[0]) eq 'JSON' | |
| 141 or (@_ > 2 and $_[0] eq 'JSON') | |
| 142 ) { | |
| 143 Carp::croak "to_json should not be called as a method."; | |
| 144 } | |
| 145 my $json = JSON->new; | |
| 146 | |
| 147 if (@_ == 2 and ref $_[1] eq 'HASH') { | |
| 148 my $opt = $_[1]; | |
| 149 for my $method (keys %$opt) { | |
| 150 $json->$method( $opt->{$method} ); | |
| 151 } | |
| 152 } | |
| 153 | |
| 154 $json->encode($_[0]); | |
| 155 } | |
| 156 | |
| 157 | |
| 158 sub from_json ($@) { | |
| 159 if ( ref($_[0]) eq 'JSON' or $_[0] eq 'JSON' ) { | |
| 160 Carp::croak "from_json should not be called as a method."; | |
| 161 } | |
| 162 my $json = JSON->new; | |
| 163 | |
| 164 if (@_ == 2 and ref $_[1] eq 'HASH') { | |
| 165 my $opt = $_[1]; | |
| 166 for my $method (keys %$opt) { | |
| 167 $json->$method( $opt->{$method} ); | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 return $json->decode( $_[0] ); | |
| 172 } | |
| 173 | |
| 174 | |
| 175 sub true { $JSON::true } | |
| 176 | |
| 177 sub false { $JSON::false } | |
| 178 | |
| 179 sub null { undef; } | |
| 180 | |
| 181 | |
| 182 sub require_xs_version { $XS_Version; } | |
| 183 | |
| 184 sub backend { | |
| 185 my $proto = shift; | |
| 186 $JSON::Backend; | |
| 187 } | |
| 188 | |
| 189 #*module = *backend; | |
| 190 | |
| 191 | |
| 192 sub is_xs { | |
| 193 return $_[0]->module eq $Module_XS; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 sub is_pp { | |
| 198 return not $_[0]->xs; | |
| 199 } | |
| 200 | |
| 201 | |
| 202 sub pureperl_only_methods { @PPOnlyMethods; } | |
| 203 | |
| 204 | |
| 205 sub property { | |
| 206 my ($self, $name, $value) = @_; | |
| 207 | |
| 208 if (@_ == 1) { | |
| 209 my %props; | |
| 210 for $name (@Properties) { | |
| 211 my $method = 'get_' . $name; | |
| 212 if ($name eq 'max_size') { | |
| 213 my $value = $self->$method(); | |
| 214 $props{$name} = $value == 1 ? 0 : $value; | |
| 215 next; | |
| 216 } | |
| 217 $props{$name} = $self->$method(); | |
| 218 } | |
| 219 return \%props; | |
| 220 } | |
| 221 elsif (@_ > 3) { | |
| 222 Carp::croak('property() can take only the option within 2 arguments.'); | |
| 223 } | |
| 224 elsif (@_ == 2) { | |
| 225 if ( my $method = $self->can('get_' . $name) ) { | |
| 226 if ($name eq 'max_size') { | |
| 227 my $value = $self->$method(); | |
| 228 return $value == 1 ? 0 : $value; | |
| 229 } | |
| 230 $self->$method(); | |
| 231 } | |
| 232 } | |
| 233 else { | |
| 234 $self->$name($value); | |
| 235 } | |
| 236 | |
| 237 } | |
| 238 | |
| 239 | |
| 240 | |
| 241 # INTERNAL | |
| 242 | |
| 243 sub _load_xs { | |
| 244 my $opt = shift; | |
| 245 | |
| 246 $JSON::DEBUG and Carp::carp "Load $Module_XS."; | |
| 247 | |
| 248 # if called after install module, overload is disable.... why? | |
| 249 JSON::Boolean::_overrride_overload($Module_XS); | |
| 250 JSON::Boolean::_overrride_overload($Module_PP); | |
| 251 | |
| 252 eval qq| | |
| 253 use $Module_XS $XS_Version (); | |
| 254 |; | |
| 255 | |
| 256 if ($@) { | |
| 257 if (defined $opt and $opt & $_INSTALL_DONT_DIE) { | |
| 258 $JSON::DEBUG and Carp::carp "Can't load $Module_XS...($@)"; | |
| 259 return 0; | |
| 260 } | |
| 261 Carp::croak $@; | |
| 262 } | |
| 263 | |
| 264 unless (defined $opt and $opt & $_INSTALL_ONLY) { | |
| 265 _set_module( $JSON::Backend = $Module_XS ); | |
| 266 my $data = join("", <DATA>); # this code is from Jcode 2.xx. | |
| 267 close(DATA); | |
| 268 eval $data; | |
| 269 JSON::Backend::XS->init; | |
| 270 } | |
| 271 | |
| 272 return 1; | |
| 273 }; | |
| 274 | |
| 275 | |
| 276 sub _load_pp { | |
| 277 my $opt = shift; | |
| 278 my $backend = $_USSING_bpPP ? $Module_bp : $Module_PP; | |
| 279 | |
| 280 $JSON::DEBUG and Carp::carp "Load $backend."; | |
| 281 | |
| 282 # if called after install module, overload is disable.... why? | |
| 283 JSON::Boolean::_overrride_overload($Module_XS); | |
| 284 JSON::Boolean::_overrride_overload($backend); | |
| 285 | |
| 286 if ( $_USSING_bpPP ) { | |
| 287 eval qq| require $backend |; | |
| 288 } | |
| 289 else { | |
| 290 eval qq| use $backend $PP_Version () |; | |
| 291 } | |
| 292 | |
| 293 if ($@) { | |
| 294 if ( $backend eq $Module_PP ) { | |
| 295 $JSON::DEBUG and Carp::carp "Can't load $Module_PP ($@), so try to l
oad $Module_bp"; | |
| 296 $_USSING_bpPP++; | |
| 297 $backend = $Module_bp; | |
| 298 JSON::Boolean::_overrride_overload($backend); | |
| 299 local $^W; # if PP installed but invalid version, backportPP redefin
es methods. | |
| 300 eval qq| require $Module_bp |; | |
| 301 } | |
| 302 Carp::croak $@ if $@; | |
| 303 } | |
| 304 | |
| 305 unless (defined $opt and $opt & $_INSTALL_ONLY) { | |
| 306 _set_module( $JSON::Backend = $Module_PP ); # even if backportPP, set $B
ackend with 'JSON::PP' | |
| 307 JSON::Backend::PP->init; | |
| 308 } | |
| 309 }; | |
| 310 | |
| 311 | |
| 312 sub _set_module { | |
| 313 return if defined $JSON::true; | |
| 314 | |
| 315 my $module = shift; | |
| 316 | |
| 317 local $^W; | |
| 318 no strict qw(refs); | |
| 319 | |
| 320 $JSON::true = ${"$module\::true"}; | |
| 321 $JSON::false = ${"$module\::false"}; | |
| 322 | |
| 323 push @JSON::ISA, $module; | |
| 324 push @{"$module\::Boolean::ISA"}, qw(JSON::Boolean); | |
| 325 | |
| 326 *{"JSON::is_bool"} = \&{"$module\::is_bool"}; | |
| 327 | |
| 328 for my $method ($module eq $Module_XS ? @PPOnlyMethods : @XSOnlyMethods) { | |
| 329 *{"JSON::$method"} = sub { | |
| 330 Carp::carp("$method is not supported in $module."); | |
| 331 $_[0]; | |
| 332 }; | |
| 333 } | |
| 334 | |
| 335 return 1; | |
| 336 } | |
| 337 | |
| 338 | |
| 339 | |
| 340 # | |
| 341 # JSON Boolean | |
| 342 # | |
| 343 | |
| 344 package JSON::Boolean; | |
| 345 | |
| 346 my %Installed; | |
| 347 | |
| 348 sub _overrride_overload { | |
| 349 return if ($Installed{ $_[0] }++); | |
| 350 | |
| 351 my $boolean = $_[0] . '::Boolean'; | |
| 352 | |
| 353 eval sprintf(q| | |
| 354 package %s; | |
| 355 use overload ( | |
| 356 '""' => sub { ${$_[0]} == 1 ? 'true' : 'false' }, | |
| 357 'eq' => sub { | |
| 358 my ($obj, $op) = ref ($_[0]) ? ($_[0], $_[1]) : ($_[1], $_[0]); | |
| 359 if ($op eq 'true' or $op eq 'false') { | |
| 360 return "$obj" eq 'true' ? 'true' eq $op : 'false' eq $op; | |
| 361 } | |
| 362 else { | |
| 363 return $obj ? 1 == $op : 0 == $op; | |
| 364 } | |
| 365 }, | |
| 366 ); | |
| 367 |, $boolean); | |
| 368 | |
| 369 if ($@) { Carp::croak $@; } | |
| 370 | |
| 371 if ( exists $INC{'JSON/XS.pm'} and $boolean eq 'JSON::XS::Boolean' ) { | |
| 372 local $^W; | |
| 373 my $true = do { bless \(my $dummy = 1), $boolean }; | |
| 374 my $false = do { bless \(my $dummy = 0), $boolean }; | |
| 375 *JSON::XS::true = sub () { $true }; | |
| 376 *JSON::XS::false = sub () { $false }; | |
| 377 } | |
| 378 elsif ( exists $INC{'JSON/PP.pm'} and $boolean eq 'JSON::PP::Boolean' ) { | |
| 379 local $^W; | |
| 380 my $true = do { bless \(my $dummy = 1), $boolean }; | |
| 381 my $false = do { bless \(my $dummy = 0), $boolean }; | |
| 382 *JSON::PP::true = sub { $true }; | |
| 383 *JSON::PP::false = sub { $false }; | |
| 384 } | |
| 385 | |
| 386 return 1; | |
| 387 } | |
| 388 | |
| 389 | |
| 390 # | |
| 391 # Helper classes for Backend Module (PP) | |
| 392 # | |
| 393 | |
| 394 package JSON::Backend::PP; | |
| 395 | |
| 396 sub init { | |
| 397 local $^W; | |
| 398 no strict qw(refs); # this routine may be called after JSON::Backend::XS ini
t was called. | |
| 399 *{"JSON::decode_json"} = \&{"JSON::PP::decode_json"}; | |
| 400 *{"JSON::encode_json"} = \&{"JSON::PP::encode_json"}; | |
| 401 *{"JSON::PP::is_xs"} = sub { 0 }; | |
| 402 *{"JSON::PP::is_pp"} = sub { 1 }; | |
| 403 return 1; | |
| 404 } | |
| 405 | |
| 406 # | |
| 407 # To save memory, the below lines are read only when XS backend is used. | |
| 408 # | |
| 409 | |
| 410 package JSON; | |
| 411 | |
| 412 1; | |
| 413 __DATA__ | |
| 414 | |
| 415 | |
| 416 # | |
| 417 # Helper classes for Backend Module (XS) | |
| 418 # | |
| 419 | |
| 420 package JSON::Backend::XS; | |
| 421 | |
| 422 use constant INDENT_LENGTH_FLAG => 15 << 12; | |
| 423 | |
| 424 use constant UNSUPPORTED_ENCODE_FLAG => { | |
| 425 ESCAPE_SLASH => 0x00000010, | |
| 426 ALLOW_BIGNUM => 0x00000020, | |
| 427 AS_NONBLESSED => 0x00000040, | |
| 428 EXPANDED => 0x10000000, # for developer's | |
| 429 }; | |
| 430 | |
| 431 use constant UNSUPPORTED_DECODE_FLAG => { | |
| 432 LOOSE => 0x00000001, | |
| 433 ALLOW_BIGNUM => 0x00000002, | |
| 434 ALLOW_BAREKEY => 0x00000004, | |
| 435 ALLOW_SINGLEQUOTE => 0x00000008, | |
| 436 EXPANDED => 0x20000000, # for developer's | |
| 437 }; | |
| 438 | |
| 439 | |
| 440 sub init { | |
| 441 local $^W; | |
| 442 no strict qw(refs); | |
| 443 *{"JSON::decode_json"} = \&{"JSON::XS::decode_json"}; | |
| 444 *{"JSON::encode_json"} = \&{"JSON::XS::encode_json"}; | |
| 445 *{"JSON::XS::is_xs"} = sub { 1 }; | |
| 446 *{"JSON::XS::is_pp"} = sub { 0 }; | |
| 447 return 1; | |
| 448 } | |
| 449 | |
| 450 | |
| 451 sub support_by_pp { | |
| 452 my ($class, @methods) = @_; | |
| 453 | |
| 454 local $^W; | |
| 455 no strict qw(refs); | |
| 456 | |
| 457 my $JSON_XS_encode_orignal = \&JSON::XS::encode; | |
| 458 my $JSON_XS_decode_orignal = \&JSON::XS::decode; | |
| 459 my $JSON_XS_incr_parse_orignal = \&JSON::XS::incr_parse; | |
| 460 | |
| 461 *JSON::XS::decode = \&JSON::Backend::XS::Supportable::_decode; | |
| 462 *JSON::XS::encode = \&JSON::Backend::XS::Supportable::_encode; | |
| 463 *JSON::XS::incr_parse = \&JSON::Backend::XS::Supportable::_incr_parse; | |
| 464 | |
| 465 *{JSON::XS::_original_decode} = $JSON_XS_decode_orignal; | |
| 466 *{JSON::XS::_original_encode} = $JSON_XS_encode_orignal; | |
| 467 *{JSON::XS::_original_incr_parse} = $JSON_XS_incr_parse_orignal; | |
| 468 | |
| 469 push @JSON::Backend::XS::Supportable::ISA, 'JSON'; | |
| 470 | |
| 471 my $pkg = 'JSON::Backend::XS::Supportable'; | |
| 472 | |
| 473 *{JSON::new} = sub { | |
| 474 my $proto = JSON::XS->new; $$proto = 0; | |
| 475 bless $proto, $pkg; | |
| 476 }; | |
| 477 | |
| 478 | |
| 479 for my $method (@methods) { | |
| 480 my $flag = uc($method); | |
| 481 my $type |= (UNSUPPORTED_ENCODE_FLAG->{$flag} || 0); | |
| 482 $type |= (UNSUPPORTED_DECODE_FLAG->{$flag} || 0); | |
| 483 | |
| 484 next unless($type); | |
| 485 | |
| 486 $pkg->_make_unsupported_method($method => $type); | |
| 487 } | |
| 488 | |
| 489 push @{"JSON::XS::Boolean::ISA"}, qw(JSON::PP::Boolean); | |
| 490 push @{"JSON::PP::Boolean::ISA"}, qw(JSON::Boolean); | |
| 491 | |
| 492 $JSON::DEBUG and Carp::carp("set -support_by_pp mode."); | |
| 493 | |
| 494 return 1; | |
| 495 } | |
| 496 | |
| 497 | |
| 498 | |
| 499 | |
| 500 # | |
| 501 # Helper classes for XS | |
| 502 # | |
| 503 | |
| 504 package JSON::Backend::XS::Supportable; | |
| 505 | |
| 506 $Carp::Internal{'JSON::Backend::XS::Supportable'} = 1; | |
| 507 | |
| 508 sub _make_unsupported_method { | |
| 509 my ($pkg, $method, $type) = @_; | |
| 510 | |
| 511 local $^W; | |
| 512 no strict qw(refs); | |
| 513 | |
| 514 *{"$pkg\::$method"} = sub { | |
| 515 local $^W; | |
| 516 if (defined $_[1] ? $_[1] : 1) { | |
| 517 ${$_[0]} |= $type; | |
| 518 } | |
| 519 else { | |
| 520 ${$_[0]} &= ~$type; | |
| 521 } | |
| 522 $_[0]; | |
| 523 }; | |
| 524 | |
| 525 *{"$pkg\::get_$method"} = sub { | |
| 526 ${$_[0]} & $type ? 1 : ''; | |
| 527 }; | |
| 528 | |
| 529 } | |
| 530 | |
| 531 | |
| 532 sub _set_for_pp { | |
| 533 JSON::_load_pp( $_INSTALL_ONLY ); | |
| 534 | |
| 535 my $type = shift; | |
| 536 my $pp = JSON::PP->new; | |
| 537 my $prop = $_[0]->property; | |
| 538 | |
| 539 for my $name (keys %$prop) { | |
| 540 $pp->$name( $prop->{$name} ? $prop->{$name} : 0 ); | |
| 541 } | |
| 542 | |
| 543 my $unsupported = $type eq 'encode' ? JSON::Backend::XS::UNSUPPORTED_ENCODE_
FLAG | |
| 544 : JSON::Backend::XS::UNSUPPORTED_DECODE_
FLAG; | |
| 545 my $flags = ${$_[0]} || 0; | |
| 546 | |
| 547 for my $name (keys %$unsupported) { | |
| 548 next if ($name eq 'EXPANDED'); # for developer's | |
| 549 my $enable = ($flags & $unsupported->{$name}) ? 1 : 0; | |
| 550 my $method = lc $name; | |
| 551 $pp->$method($enable); | |
| 552 } | |
| 553 | |
| 554 $pp->indent_length( $_[0]->get_indent_length ); | |
| 555 | |
| 556 return $pp; | |
| 557 } | |
| 558 | |
| 559 sub _encode { # using with PP encode | |
| 560 if (${$_[0]}) { | |
| 561 _set_for_pp('encode' => @_)->encode($_[1]); | |
| 562 } | |
| 563 else { | |
| 564 $_[0]->_original_encode( $_[1] ); | |
| 565 } | |
| 566 } | |
| 567 | |
| 568 | |
| 569 sub _decode { # if unsupported-flag is set, use PP | |
| 570 if (${$_[0]}) { | |
| 571 _set_for_pp('decode' => @_)->decode($_[1]); | |
| 572 } | |
| 573 else { | |
| 574 $_[0]->_original_decode( $_[1] ); | |
| 575 } | |
| 576 } | |
| 577 | |
| 578 | |
| 579 sub decode_prefix { # if unsupported-flag is set, use PP | |
| 580 _set_for_pp('decode' => @_)->decode_prefix($_[1]); | |
| 581 } | |
| 582 | |
| 583 | |
| 584 sub _incr_parse { | |
| 585 if (${$_[0]}) { | |
| 586 _set_for_pp('decode' => @_)->incr_parse($_[1]); | |
| 587 } | |
| 588 else { | |
| 589 $_[0]->_original_incr_parse( $_[1] ); | |
| 590 } | |
| 591 } | |
| 592 | |
| 593 | |
| 594 sub get_indent_length { | |
| 595 ${$_[0]} << 4 >> 16; | |
| 596 } | |
| 597 | |
| 598 | |
| 599 sub indent_length { | |
| 600 my $length = $_[1]; | |
| 601 | |
| 602 if (!defined $length or $length > 15 or $length < 0) { | |
| 603 Carp::carp "The acceptable range of indent_length() is 0 to 15."; | |
| 604 } | |
| 605 else { | |
| 606 local $^W; | |
| 607 $length <<= 12; | |
| 608 ${$_[0]} &= ~ JSON::Backend::XS::INDENT_LENGTH_FLAG; | |
| 609 ${$_[0]} |= $length; | |
| 610 *JSON::XS::encode = \&JSON::Backend::XS::Supportable::_encode; | |
| 611 } | |
| 612 | |
| 613 $_[0]; | |
| 614 } | |
| 615 | |
| 616 | |
| 617 1; | |
| 618 __END__ | |
| 619 | |
| 620 =head1 NAME | |
| 621 | |
| 622 JSON - JSON (JavaScript Object Notation) encoder/decoder | |
| 623 | |
| 624 =head1 SYNOPSIS | |
| 625 | |
| 626 use JSON; # imports encode_json, decode_json, to_json and from_json. | |
| 627 | |
| 628 # simple and fast interfaces (expect/generate UTF-8) | |
| 629 | |
| 630 $utf8_encoded_json_text = encode_json $perl_hash_or_arrayref; | |
| 631 $perl_hash_or_arrayref = decode_json $utf8_encoded_json_text; | |
| 632 | |
| 633 # OO-interface | |
| 634 | |
| 635 $json = JSON->new->allow_nonref; | |
| 636 | |
| 637 $json_text = $json->encode( $perl_scalar ); | |
| 638 $perl_scalar = $json->decode( $json_text ); | |
| 639 | |
| 640 $pretty_printed = $json->pretty->encode( $perl_scalar ); # pretty-printing | |
| 641 | |
| 642 # If you want to use PP only support features, call with '-support_by_pp' | |
| 643 # When XS unsupported feature is enable, using PP (de|en)code instead of XS one
s. | |
| 644 | |
| 645 use JSON -support_by_pp; | |
| 646 | |
| 647 # option-acceptable interfaces (expect/generate UNICODE by default) | |
| 648 | |
| 649 $json_text = to_json( $perl_scalar, { ascii => 1, pretty => 1 } ); | |
| 650 $perl_scalar = from_json( $json_text, { utf8 => 1 } ); | |
| 651 | |
| 652 # Between (en|de)code_json and (to|from)_json, if you want to write | |
| 653 # a code which communicates to an outer world (encoded in UTF-8), | |
| 654 # recommend to use (en|de)code_json. | |
| 655 | |
| 656 =head1 VERSION | |
| 657 | |
| 658 2.59 | |
| 659 | |
| 660 This version is compatible with JSON::XS B<2.34> and later. | |
| 661 | |
| 662 | |
| 663 =head1 NOTE | |
| 664 | |
| 665 JSON::PP was earlier included in the C<JSON> distribution, but | |
| 666 has since Perl 5.14 been a core module. For this reason, | |
| 667 L<JSON::PP> was removed from the JSON distribution and can now | |
| 668 be found also in the Perl5 repository at | |
| 669 | |
| 670 =over | |
| 671 | |
| 672 =item * L<http://perl5.git.perl.org/perl.git> | |
| 673 | |
| 674 =back | |
| 675 | |
| 676 (The newest JSON::PP version still exists in CPAN.) | |
| 677 | |
| 678 Instead, the C<JSON> distribution will include JSON::backportPP | |
| 679 for backwards computability. JSON.pm should thus work as it did | |
| 680 before. | |
| 681 | |
| 682 =head1 DESCRIPTION | |
| 683 | |
| 684 ************************** CAUTION ******************************** | |
| 685 * This is 'JSON module version 2' and there are many differences * | |
| 686 * to version 1.xx * | |
| 687 * Please check your applications using old version. * | |
| 688 * See to 'INCOMPATIBLE CHANGES TO OLD VERSION' * | |
| 689 ******************************************************************* | |
| 690 | |
| 691 JSON (JavaScript Object Notation) is a simple data format. | |
| 692 See to L<http://www.json.org/> and C<RFC4627>(L<http://www.ietf.org/rfc/rfc4627.
txt>). | |
| 693 | |
| 694 This module converts Perl data structures to JSON and vice versa using either | |
| 695 L<JSON::XS> or L<JSON::PP>. | |
| 696 | |
| 697 JSON::XS is the fastest and most proper JSON module on CPAN which must be | |
| 698 compiled and installed in your environment. | |
| 699 JSON::PP is a pure-Perl module which is bundled in this distribution and | |
| 700 has a strong compatibility to JSON::XS. | |
| 701 | |
| 702 This module try to use JSON::XS by default and fail to it, use JSON::PP instead. | |
| 703 So its features completely depend on JSON::XS or JSON::PP. | |
| 704 | |
| 705 See to L<BACKEND MODULE DECISION>. | |
| 706 | |
| 707 To distinguish the module name 'JSON' and the format type JSON, | |
| 708 the former is quoted by CE<lt>E<gt> (its results vary with your using media), | |
| 709 and the latter is left just as it is. | |
| 710 | |
| 711 Module name : C<JSON> | |
| 712 | |
| 713 Format type : JSON | |
| 714 | |
| 715 =head2 FEATURES | |
| 716 | |
| 717 =over | |
| 718 | |
| 719 =item * correct unicode handling | |
| 720 | |
| 721 This module (i.e. backend modules) knows how to handle Unicode, documents | |
| 722 how and when it does so, and even documents what "correct" means. | |
| 723 | |
| 724 Even though there are limitations, this feature is available since Perl version
5.6. | |
| 725 | |
| 726 JSON::XS requires Perl 5.8.2 (but works correctly in 5.8.8 or later), so in olde
r versions | |
| 727 C<JSON> should call JSON::PP as the backend which can be used since Perl 5.005. | |
| 728 | |
| 729 With Perl 5.8.x JSON::PP works, but from 5.8.0 to 5.8.2, because of a Perl side
problem, | |
| 730 JSON::PP works slower in the versions. And in 5.005, the Unicode handling is not
available. | |
| 731 See to L<JSON::PP/UNICODE HANDLING ON PERLS> for more information. | |
| 732 | |
| 733 See also to L<JSON::XS/A FEW NOTES ON UNICODE AND PERL> | |
| 734 and L<JSON::XS/ENCODING/CODESET_FLAG_NOTES>. | |
| 735 | |
| 736 | |
| 737 =item * round-trip integrity | |
| 738 | |
| 739 When you serialise a perl data structure using only data types supported | |
| 740 by JSON and Perl, the deserialised data structure is identical on the Perl | |
| 741 level. (e.g. the string "2.0" doesn't suddenly become "2" just because | |
| 742 it looks like a number). There I<are> minor exceptions to this, read the | |
| 743 L</MAPPING> section below to learn about those. | |
| 744 | |
| 745 | |
| 746 =item * strict checking of JSON correctness | |
| 747 | |
| 748 There is no guessing, no generating of illegal JSON texts by default, | |
| 749 and only JSON is accepted as input by default (the latter is a security | |
| 750 feature). | |
| 751 | |
| 752 See to L<JSON::XS/FEATURES> and L<JSON::PP/FEATURES>. | |
| 753 | |
| 754 =item * fast | |
| 755 | |
| 756 This module returns a JSON::XS object itself if available. | |
| 757 Compared to other JSON modules and other serialisers such as Storable, | |
| 758 JSON::XS usually compares favorably in terms of speed, too. | |
| 759 | |
| 760 If not available, C<JSON> returns a JSON::PP object instead of JSON::XS and | |
| 761 it is very slow as pure-Perl. | |
| 762 | |
| 763 =item * simple to use | |
| 764 | |
| 765 This module has both a simple functional interface as well as an | |
| 766 object oriented interface interface. | |
| 767 | |
| 768 =item * reasonably versatile output formats | |
| 769 | |
| 770 You can choose between the most compact guaranteed-single-line format possible | |
| 771 (nice for simple line-based protocols), a pure-ASCII format (for when your trans
port | |
| 772 is not 8-bit clean, still supports the whole Unicode range), or a pretty-printed | |
| 773 format (for when you want to read that stuff). Or you can combine those features | |
| 774 in whatever way you like. | |
| 775 | |
| 776 =back | |
| 777 | |
| 778 =head1 FUNCTIONAL INTERFACE | |
| 779 | |
| 780 Some documents are copied and modified from L<JSON::XS/FUNCTIONAL INTERFACE>. | |
| 781 C<to_json> and C<from_json> are additional functions. | |
| 782 | |
| 783 =head2 encode_json | |
| 784 | |
| 785 $json_text = encode_json $perl_scalar | |
| 786 | |
| 787 Converts the given Perl data structure to a UTF-8 encoded, binary string. | |
| 788 | |
| 789 This function call is functionally identical to: | |
| 790 | |
| 791 $json_text = JSON->new->utf8->encode($perl_scalar) | |
| 792 | |
| 793 =head2 decode_json | |
| 794 | |
| 795 $perl_scalar = decode_json $json_text | |
| 796 | |
| 797 The opposite of C<encode_json>: expects an UTF-8 (binary) string and tries | |
| 798 to parse that as an UTF-8 encoded JSON text, returning the resulting | |
| 799 reference. | |
| 800 | |
| 801 This function call is functionally identical to: | |
| 802 | |
| 803 $perl_scalar = JSON->new->utf8->decode($json_text) | |
| 804 | |
| 805 | |
| 806 =head2 to_json | |
| 807 | |
| 808 $json_text = to_json($perl_scalar) | |
| 809 | |
| 810 Converts the given Perl data structure to a json string. | |
| 811 | |
| 812 This function call is functionally identical to: | |
| 813 | |
| 814 $json_text = JSON->new->encode($perl_scalar) | |
| 815 | |
| 816 Takes a hash reference as the second. | |
| 817 | |
| 818 $json_text = to_json($perl_scalar, $flag_hashref) | |
| 819 | |
| 820 So, | |
| 821 | |
| 822 $json_text = to_json($perl_scalar, {utf8 => 1, pretty => 1}) | |
| 823 | |
| 824 equivalent to: | |
| 825 | |
| 826 $json_text = JSON->new->utf8(1)->pretty(1)->encode($perl_scalar) | |
| 827 | |
| 828 If you want to write a modern perl code which communicates to outer world, | |
| 829 you should use C<encode_json> (supposed that JSON data are encoded in UTF-8). | |
| 830 | |
| 831 =head2 from_json | |
| 832 | |
| 833 $perl_scalar = from_json($json_text) | |
| 834 | |
| 835 The opposite of C<to_json>: expects a json string and tries | |
| 836 to parse it, returning the resulting reference. | |
| 837 | |
| 838 This function call is functionally identical to: | |
| 839 | |
| 840 $perl_scalar = JSON->decode($json_text) | |
| 841 | |
| 842 Takes a hash reference as the second. | |
| 843 | |
| 844 $perl_scalar = from_json($json_text, $flag_hashref) | |
| 845 | |
| 846 So, | |
| 847 | |
| 848 $perl_scalar = from_json($json_text, {utf8 => 1}) | |
| 849 | |
| 850 equivalent to: | |
| 851 | |
| 852 $perl_scalar = JSON->new->utf8(1)->decode($json_text) | |
| 853 | |
| 854 If you want to write a modern perl code which communicates to outer world, | |
| 855 you should use C<decode_json> (supposed that JSON data are encoded in UTF-8). | |
| 856 | |
| 857 =head2 JSON::is_bool | |
| 858 | |
| 859 $is_boolean = JSON::is_bool($scalar) | |
| 860 | |
| 861 Returns true if the passed scalar represents either JSON::true or | |
| 862 JSON::false, two constants that act like C<1> and C<0> respectively | |
| 863 and are also used to represent JSON C<true> and C<false> in Perl strings. | |
| 864 | |
| 865 =head2 JSON::true | |
| 866 | |
| 867 Returns JSON true value which is blessed object. | |
| 868 It C<isa> JSON::Boolean object. | |
| 869 | |
| 870 =head2 JSON::false | |
| 871 | |
| 872 Returns JSON false value which is blessed object. | |
| 873 It C<isa> JSON::Boolean object. | |
| 874 | |
| 875 =head2 JSON::null | |
| 876 | |
| 877 Returns C<undef>. | |
| 878 | |
| 879 See L<MAPPING>, below, for more information on how JSON values are mapped to | |
| 880 Perl. | |
| 881 | |
| 882 =head1 HOW DO I DECODE A DATA FROM OUTER AND ENCODE TO OUTER | |
| 883 | |
| 884 This section supposes that your perl version is 5.8 or later. | |
| 885 | |
| 886 If you know a JSON text from an outer world - a network, a file content, and so
on, | |
| 887 is encoded in UTF-8, you should use C<decode_json> or C<JSON> module object | |
| 888 with C<utf8> enable. And the decoded result will contain UNICODE characters. | |
| 889 | |
| 890 # from network | |
| 891 my $json = JSON->new->utf8; | |
| 892 my $json_text = CGI->new->param( 'json_data' ); | |
| 893 my $perl_scalar = $json->decode( $json_text ); | |
| 894 | |
| 895 # from file content | |
| 896 local $/; | |
| 897 open( my $fh, '<', 'json.data' ); | |
| 898 $json_text = <$fh>; | |
| 899 $perl_scalar = decode_json( $json_text ); | |
| 900 | |
| 901 If an outer data is not encoded in UTF-8, firstly you should C<decode> it. | |
| 902 | |
| 903 use Encode; | |
| 904 local $/; | |
| 905 open( my $fh, '<', 'json.data' ); | |
| 906 my $encoding = 'cp932'; | |
| 907 my $unicode_json_text = decode( $encoding, <$fh> ); # UNICODE | |
| 908 | |
| 909 # or you can write the below code. | |
| 910 # | |
| 911 # open( my $fh, "<:encoding($encoding)", 'json.data' ); | |
| 912 # $unicode_json_text = <$fh>; | |
| 913 | |
| 914 In this case, C<$unicode_json_text> is of course UNICODE string. | |
| 915 So you B<cannot> use C<decode_json> nor C<JSON> module object with C<utf8> enabl
e. | |
| 916 Instead of them, you use C<JSON> module object with C<utf8> disable or C<from_js
on>. | |
| 917 | |
| 918 $perl_scalar = $json->utf8(0)->decode( $unicode_json_text ); | |
| 919 # or | |
| 920 $perl_scalar = from_json( $unicode_json_text ); | |
| 921 | |
| 922 Or C<encode 'utf8'> and C<decode_json>: | |
| 923 | |
| 924 $perl_scalar = decode_json( encode( 'utf8', $unicode_json_text ) ); | |
| 925 # this way is not efficient. | |
| 926 | |
| 927 And now, you want to convert your C<$perl_scalar> into JSON data and | |
| 928 send it to an outer world - a network or a file content, and so on. | |
| 929 | |
| 930 Your data usually contains UNICODE strings and you want the converted data to be
encoded | |
| 931 in UTF-8, you should use C<encode_json> or C<JSON> module object with C<utf8> en
able. | |
| 932 | |
| 933 print encode_json( $perl_scalar ); # to a network? file? or display? | |
| 934 # or | |
| 935 print $json->utf8->encode( $perl_scalar ); | |
| 936 | |
| 937 If C<$perl_scalar> does not contain UNICODE but C<$encoding>-encoded strings | |
| 938 for some reason, then its characters are regarded as B<latin1> for perl | |
| 939 (because it does not concern with your $encoding). | |
| 940 You B<cannot> use C<encode_json> nor C<JSON> module object with C<utf8> enable. | |
| 941 Instead of them, you use C<JSON> module object with C<utf8> disable or C<to_json
>. | |
| 942 Note that the resulted text is a UNICODE string but no problem to print it. | |
| 943 | |
| 944 # $perl_scalar contains $encoding encoded string values | |
| 945 $unicode_json_text = $json->utf8(0)->encode( $perl_scalar ); | |
| 946 # or | |
| 947 $unicode_json_text = to_json( $perl_scalar ); | |
| 948 # $unicode_json_text consists of characters less than 0x100 | |
| 949 print $unicode_json_text; | |
| 950 | |
| 951 Or C<decode $encoding> all string values and C<encode_json>: | |
| 952 | |
| 953 $perl_scalar->{ foo } = decode( $encoding, $perl_scalar->{ foo } ); | |
| 954 # ... do it to each string values, then encode_json | |
| 955 $json_text = encode_json( $perl_scalar ); | |
| 956 | |
| 957 This method is a proper way but probably not efficient. | |
| 958 | |
| 959 See to L<Encode>, L<perluniintro>. | |
| 960 | |
| 961 | |
| 962 =head1 COMMON OBJECT-ORIENTED INTERFACE | |
| 963 | |
| 964 =head2 new | |
| 965 | |
| 966 $json = JSON->new | |
| 967 | |
| 968 Returns a new C<JSON> object inherited from either JSON::XS or JSON::PP | |
| 969 that can be used to de/encode JSON strings. | |
| 970 | |
| 971 All boolean flags described below are by default I<disabled>. | |
| 972 | |
| 973 The mutators for flags all return the JSON object again and thus calls can | |
| 974 be chained: | |
| 975 | |
| 976 my $json = JSON->new->utf8->space_after->encode({a => [1,2]}) | |
| 977 => {"a": [1, 2]} | |
| 978 | |
| 979 =head2 ascii | |
| 980 | |
| 981 $json = $json->ascii([$enable]) | |
| 982 | |
| 983 $enabled = $json->get_ascii | |
| 984 | |
| 985 If $enable is true (or missing), then the encode method will not generate charac
ters outside | |
| 986 the code range 0..127. Any Unicode characters outside that range will be escaped
using either | |
| 987 a single \uXXXX or a double \uHHHH\uLLLLL escape sequence, as per RFC4627. | |
| 988 | |
| 989 If $enable is false, then the encode method will not escape Unicode characters u
nless | |
| 990 required by the JSON syntax or other flags. This results in a faster and more co
mpact format. | |
| 991 | |
| 992 This feature depends on the used Perl version and environment. | |
| 993 | |
| 994 See to L<JSON::PP/UNICODE HANDLING ON PERLS> if the backend is PP. | |
| 995 | |
| 996 JSON->new->ascii(1)->encode([chr 0x10401]) | |
| 997 => ["\ud801\udc01"] | |
| 998 | |
| 999 =head2 latin1 | |
| 1000 | |
| 1001 $json = $json->latin1([$enable]) | |
| 1002 | |
| 1003 $enabled = $json->get_latin1 | |
| 1004 | |
| 1005 If $enable is true (or missing), then the encode method will encode the resultin
g JSON | |
| 1006 text as latin1 (or iso-8859-1), escaping any characters outside the code range 0
..255. | |
| 1007 | |
| 1008 If $enable is false, then the encode method will not escape Unicode characters | |
| 1009 unless required by the JSON syntax or other flags. | |
| 1010 | |
| 1011 JSON->new->latin1->encode (["\x{89}\x{abc}"] | |
| 1012 => ["\x{89}\\u0abc"] # (perl syntax, U+abc escaped, U+89 not) | |
| 1013 | |
| 1014 =head2 utf8 | |
| 1015 | |
| 1016 $json = $json->utf8([$enable]) | |
| 1017 | |
| 1018 $enabled = $json->get_utf8 | |
| 1019 | |
| 1020 If $enable is true (or missing), then the encode method will encode the JSON res
ult | |
| 1021 into UTF-8, as required by many protocols, while the decode method expects to be
handled | |
| 1022 an UTF-8-encoded string. Please note that UTF-8-encoded strings do not contain a
ny | |
| 1023 characters outside the range 0..255, they are thus useful for bytewise/binary I/
O. | |
| 1024 | |
| 1025 In future versions, enabling this option might enable autodetection of the UTF-1
6 and UTF-32 | |
| 1026 encoding families, as described in RFC4627. | |
| 1027 | |
| 1028 If $enable is false, then the encode method will return the JSON string as a (no
n-encoded) | |
| 1029 Unicode string, while decode expects thus a Unicode string. Any decoding or enco
ding | |
| 1030 (e.g. to UTF-8 or UTF-16) needs to be done yourself, e.g. using the Encode modul
e. | |
| 1031 | |
| 1032 | |
| 1033 Example, output UTF-16BE-encoded JSON: | |
| 1034 | |
| 1035 use Encode; | |
| 1036 $jsontext = encode "UTF-16BE", JSON::XS->new->encode ($object); | |
| 1037 | |
| 1038 Example, decode UTF-32LE-encoded JSON: | |
| 1039 | |
| 1040 use Encode; | |
| 1041 $object = JSON::XS->new->decode (decode "UTF-32LE", $jsontext); | |
| 1042 | |
| 1043 See to L<JSON::PP/UNICODE HANDLING ON PERLS> if the backend is PP. | |
| 1044 | |
| 1045 | |
| 1046 =head2 pretty | |
| 1047 | |
| 1048 $json = $json->pretty([$enable]) | |
| 1049 | |
| 1050 This enables (or disables) all of the C<indent>, C<space_before> and | |
| 1051 C<space_after> (and in the future possibly more) flags in one call to | |
| 1052 generate the most readable (or most compact) form possible. | |
| 1053 | |
| 1054 Equivalent to: | |
| 1055 | |
| 1056 $json->indent->space_before->space_after | |
| 1057 | |
| 1058 The indent space length is three and JSON::XS cannot change the indent | |
| 1059 space length. | |
| 1060 | |
| 1061 =head2 indent | |
| 1062 | |
| 1063 $json = $json->indent([$enable]) | |
| 1064 | |
| 1065 $enabled = $json->get_indent | |
| 1066 | |
| 1067 If C<$enable> is true (or missing), then the C<encode> method will use a multili
ne | |
| 1068 format as output, putting every array member or object/hash key-value pair | |
| 1069 into its own line, identifying them properly. | |
| 1070 | |
| 1071 If C<$enable> is false, no newlines or indenting will be produced, and the | |
| 1072 resulting JSON text is guaranteed not to contain any C<newlines>. | |
| 1073 | |
| 1074 This setting has no effect when decoding JSON texts. | |
| 1075 | |
| 1076 The indent space length is three. | |
| 1077 With JSON::PP, you can also access C<indent_length> to change indent space lengt
h. | |
| 1078 | |
| 1079 | |
| 1080 =head2 space_before | |
| 1081 | |
| 1082 $json = $json->space_before([$enable]) | |
| 1083 | |
| 1084 $enabled = $json->get_space_before | |
| 1085 | |
| 1086 If C<$enable> is true (or missing), then the C<encode> method will add an extra | |
| 1087 optional space before the C<:> separating keys from values in JSON objects. | |
| 1088 | |
| 1089 If C<$enable> is false, then the C<encode> method will not add any extra | |
| 1090 space at those places. | |
| 1091 | |
| 1092 This setting has no effect when decoding JSON texts. | |
| 1093 | |
| 1094 Example, space_before enabled, space_after and indent disabled: | |
| 1095 | |
| 1096 {"key" :"value"} | |
| 1097 | |
| 1098 | |
| 1099 =head2 space_after | |
| 1100 | |
| 1101 $json = $json->space_after([$enable]) | |
| 1102 | |
| 1103 $enabled = $json->get_space_after | |
| 1104 | |
| 1105 If C<$enable> is true (or missing), then the C<encode> method will add an extra | |
| 1106 optional space after the C<:> separating keys from values in JSON objects | |
| 1107 and extra whitespace after the C<,> separating key-value pairs and array | |
| 1108 members. | |
| 1109 | |
| 1110 If C<$enable> is false, then the C<encode> method will not add any extra | |
| 1111 space at those places. | |
| 1112 | |
| 1113 This setting has no effect when decoding JSON texts. | |
| 1114 | |
| 1115 Example, space_before and indent disabled, space_after enabled: | |
| 1116 | |
| 1117 {"key": "value"} | |
| 1118 | |
| 1119 | |
| 1120 =head2 relaxed | |
| 1121 | |
| 1122 $json = $json->relaxed([$enable]) | |
| 1123 | |
| 1124 $enabled = $json->get_relaxed | |
| 1125 | |
| 1126 If C<$enable> is true (or missing), then C<decode> will accept some | |
| 1127 extensions to normal JSON syntax (see below). C<encode> will not be | |
| 1128 affected in anyway. I<Be aware that this option makes you accept invalid | |
| 1129 JSON texts as if they were valid!>. I suggest only to use this option to | |
| 1130 parse application-specific files written by humans (configuration files, | |
| 1131 resource files etc.) | |
| 1132 | |
| 1133 If C<$enable> is false (the default), then C<decode> will only accept | |
| 1134 valid JSON texts. | |
| 1135 | |
| 1136 Currently accepted extensions are: | |
| 1137 | |
| 1138 =over 4 | |
| 1139 | |
| 1140 =item * list items can have an end-comma | |
| 1141 | |
| 1142 JSON I<separates> array elements and key-value pairs with commas. This | |
| 1143 can be annoying if you write JSON texts manually and want to be able to | |
| 1144 quickly append elements, so this extension accepts comma at the end of | |
| 1145 such items not just between them: | |
| 1146 | |
| 1147 [ | |
| 1148 1, | |
| 1149 2, <- this comma not normally allowed | |
| 1150 ] | |
| 1151 { | |
| 1152 "k1": "v1", | |
| 1153 "k2": "v2", <- this comma not normally allowed | |
| 1154 } | |
| 1155 | |
| 1156 =item * shell-style '#'-comments | |
| 1157 | |
| 1158 Whenever JSON allows whitespace, shell-style comments are additionally | |
| 1159 allowed. They are terminated by the first carriage-return or line-feed | |
| 1160 character, after which more white-space and comments are allowed. | |
| 1161 | |
| 1162 [ | |
| 1163 1, # this comment not allowed in JSON | |
| 1164 # neither this one... | |
| 1165 ] | |
| 1166 | |
| 1167 =back | |
| 1168 | |
| 1169 | |
| 1170 =head2 canonical | |
| 1171 | |
| 1172 $json = $json->canonical([$enable]) | |
| 1173 | |
| 1174 $enabled = $json->get_canonical | |
| 1175 | |
| 1176 If C<$enable> is true (or missing), then the C<encode> method will output JSON o
bjects | |
| 1177 by sorting their keys. This is adding a comparatively high overhead. | |
| 1178 | |
| 1179 If C<$enable> is false, then the C<encode> method will output key-value | |
| 1180 pairs in the order Perl stores them (which will likely change between runs | |
| 1181 of the same script). | |
| 1182 | |
| 1183 This option is useful if you want the same data structure to be encoded as | |
| 1184 the same JSON text (given the same overall settings). If it is disabled, | |
| 1185 the same hash might be encoded differently even if contains the same data, | |
| 1186 as key-value pairs have no inherent ordering in Perl. | |
| 1187 | |
| 1188 This setting has no effect when decoding JSON texts. | |
| 1189 | |
| 1190 =head2 allow_nonref | |
| 1191 | |
| 1192 $json = $json->allow_nonref([$enable]) | |
| 1193 | |
| 1194 $enabled = $json->get_allow_nonref | |
| 1195 | |
| 1196 If C<$enable> is true (or missing), then the C<encode> method can convert a | |
| 1197 non-reference into its corresponding string, number or null JSON value, | |
| 1198 which is an extension to RFC4627. Likewise, C<decode> will accept those JSON | |
| 1199 values instead of croaking. | |
| 1200 | |
| 1201 If C<$enable> is false, then the C<encode> method will croak if it isn't | |
| 1202 passed an arrayref or hashref, as JSON texts must either be an object | |
| 1203 or array. Likewise, C<decode> will croak if given something that is not a | |
| 1204 JSON object or array. | |
| 1205 | |
| 1206 JSON->new->allow_nonref->encode ("Hello, World!") | |
| 1207 => "Hello, World!" | |
| 1208 | |
| 1209 =head2 allow_unknown | |
| 1210 | |
| 1211 $json = $json->allow_unknown ([$enable]) | |
| 1212 | |
| 1213 $enabled = $json->get_allow_unknown | |
| 1214 | |
| 1215 If $enable is true (or missing), then "encode" will *not* throw an | |
| 1216 exception when it encounters values it cannot represent in JSON (for | |
| 1217 example, filehandles) but instead will encode a JSON "null" value. | |
| 1218 Note that blessed objects are not included here and are handled | |
| 1219 separately by c<allow_nonref>. | |
| 1220 | |
| 1221 If $enable is false (the default), then "encode" will throw an | |
| 1222 exception when it encounters anything it cannot encode as JSON. | |
| 1223 | |
| 1224 This option does not affect "decode" in any way, and it is | |
| 1225 recommended to leave it off unless you know your communications | |
| 1226 partner. | |
| 1227 | |
| 1228 =head2 allow_blessed | |
| 1229 | |
| 1230 $json = $json->allow_blessed([$enable]) | |
| 1231 | |
| 1232 $enabled = $json->get_allow_blessed | |
| 1233 | |
| 1234 If C<$enable> is true (or missing), then the C<encode> method will not | |
| 1235 barf when it encounters a blessed reference. Instead, the value of the | |
| 1236 B<convert_blessed> option will decide whether C<null> (C<convert_blessed> | |
| 1237 disabled or no C<TO_JSON> method found) or a representation of the | |
| 1238 object (C<convert_blessed> enabled and C<TO_JSON> method found) is being | |
| 1239 encoded. Has no effect on C<decode>. | |
| 1240 | |
| 1241 If C<$enable> is false (the default), then C<encode> will throw an | |
| 1242 exception when it encounters a blessed object. | |
| 1243 | |
| 1244 | |
| 1245 =head2 convert_blessed | |
| 1246 | |
| 1247 $json = $json->convert_blessed([$enable]) | |
| 1248 | |
| 1249 $enabled = $json->get_convert_blessed | |
| 1250 | |
| 1251 If C<$enable> is true (or missing), then C<encode>, upon encountering a | |
| 1252 blessed object, will check for the availability of the C<TO_JSON> method | |
| 1253 on the object's class. If found, it will be called in scalar context | |
| 1254 and the resulting scalar will be encoded instead of the object. If no | |
| 1255 C<TO_JSON> method is found, the value of C<allow_blessed> will decide what | |
| 1256 to do. | |
| 1257 | |
| 1258 The C<TO_JSON> method may safely call die if it wants. If C<TO_JSON> | |
| 1259 returns other blessed objects, those will be handled in the same | |
| 1260 way. C<TO_JSON> must take care of not causing an endless recursion cycle | |
| 1261 (== crash) in this case. The name of C<TO_JSON> was chosen because other | |
| 1262 methods called by the Perl core (== not by the user of the object) are | |
| 1263 usually in upper case letters and to avoid collisions with the C<to_json> | |
| 1264 function or method. | |
| 1265 | |
| 1266 This setting does not yet influence C<decode> in any way. | |
| 1267 | |
| 1268 If C<$enable> is false, then the C<allow_blessed> setting will decide what | |
| 1269 to do when a blessed object is found. | |
| 1270 | |
| 1271 =over | |
| 1272 | |
| 1273 =item convert_blessed_universally mode | |
| 1274 | |
| 1275 If use C<JSON> with C<-convert_blessed_universally>, the C<UNIVERSAL::TO_JSON> | |
| 1276 subroutine is defined as the below code: | |
| 1277 | |
| 1278 *UNIVERSAL::TO_JSON = sub { | |
| 1279 my $b_obj = B::svref_2object( $_[0] ); | |
| 1280 return $b_obj->isa('B::HV') ? { %{ $_[0] } } | |
| 1281 : $b_obj->isa('B::AV') ? [ @{ $_[0] } ] | |
| 1282 : undef | |
| 1283 ; | |
| 1284 } | |
| 1285 | |
| 1286 This will cause that C<encode> method converts simple blessed objects into | |
| 1287 JSON objects as non-blessed object. | |
| 1288 | |
| 1289 JSON -convert_blessed_universally; | |
| 1290 $json->allow_blessed->convert_blessed->encode( $blessed_object ) | |
| 1291 | |
| 1292 This feature is experimental and may be removed in the future. | |
| 1293 | |
| 1294 =back | |
| 1295 | |
| 1296 =head2 filter_json_object | |
| 1297 | |
| 1298 $json = $json->filter_json_object([$coderef]) | |
| 1299 | |
| 1300 When C<$coderef> is specified, it will be called from C<decode> each | |
| 1301 time it decodes a JSON object. The only argument passed to the coderef | |
| 1302 is a reference to the newly-created hash. If the code references returns | |
| 1303 a single scalar (which need not be a reference), this value | |
| 1304 (i.e. a copy of that scalar to avoid aliasing) is inserted into the | |
| 1305 deserialised data structure. If it returns an empty list | |
| 1306 (NOTE: I<not> C<undef>, which is a valid scalar), the original deserialised | |
| 1307 hash will be inserted. This setting can slow down decoding considerably. | |
| 1308 | |
| 1309 When C<$coderef> is omitted or undefined, any existing callback will | |
| 1310 be removed and C<decode> will not change the deserialised hash in any | |
| 1311 way. | |
| 1312 | |
| 1313 Example, convert all JSON objects into the integer 5: | |
| 1314 | |
| 1315 my $js = JSON->new->filter_json_object (sub { 5 }); | |
| 1316 # returns [5] | |
| 1317 $js->decode ('[{}]'); # the given subroutine takes a hash reference. | |
| 1318 # throw an exception because allow_nonref is not enabled | |
| 1319 # so a lone 5 is not allowed. | |
| 1320 $js->decode ('{"a":1, "b":2}'); | |
| 1321 | |
| 1322 | |
| 1323 =head2 filter_json_single_key_object | |
| 1324 | |
| 1325 $json = $json->filter_json_single_key_object($key [=> $coderef]) | |
| 1326 | |
| 1327 Works remotely similar to C<filter_json_object>, but is only called for | |
| 1328 JSON objects having a single key named C<$key>. | |
| 1329 | |
| 1330 This C<$coderef> is called before the one specified via | |
| 1331 C<filter_json_object>, if any. It gets passed the single value in the JSON | |
| 1332 object. If it returns a single value, it will be inserted into the data | |
| 1333 structure. If it returns nothing (not even C<undef> but the empty list), | |
| 1334 the callback from C<filter_json_object> will be called next, as if no | |
| 1335 single-key callback were specified. | |
| 1336 | |
| 1337 If C<$coderef> is omitted or undefined, the corresponding callback will be | |
| 1338 disabled. There can only ever be one callback for a given key. | |
| 1339 | |
| 1340 As this callback gets called less often then the C<filter_json_object> | |
| 1341 one, decoding speed will not usually suffer as much. Therefore, single-key | |
| 1342 objects make excellent targets to serialise Perl objects into, especially | |
| 1343 as single-key JSON objects are as close to the type-tagged value concept | |
| 1344 as JSON gets (it's basically an ID/VALUE tuple). Of course, JSON does not | |
| 1345 support this in any way, so you need to make sure your data never looks | |
| 1346 like a serialised Perl hash. | |
| 1347 | |
| 1348 Typical names for the single object key are C<__class_whatever__>, or | |
| 1349 C<$__dollars_are_rarely_used__$> or C<}ugly_brace_placement>, or even | |
| 1350 things like C<__class_md5sum(classname)__>, to reduce the risk of clashing | |
| 1351 with real hashes. | |
| 1352 | |
| 1353 Example, decode JSON objects of the form C<< { "__widget__" => <id> } >> | |
| 1354 into the corresponding C<< $WIDGET{<id>} >> object: | |
| 1355 | |
| 1356 # return whatever is in $WIDGET{5}: | |
| 1357 JSON | |
| 1358 ->new | |
| 1359 ->filter_json_single_key_object (__widget__ => sub { | |
| 1360 $WIDGET{ $_[0] } | |
| 1361 }) | |
| 1362 ->decode ('{"__widget__": 5') | |
| 1363 | |
| 1364 # this can be used with a TO_JSON method in some "widget" class | |
| 1365 # for serialisation to json: | |
| 1366 sub WidgetBase::TO_JSON { | |
| 1367 my ($self) = @_; | |
| 1368 | |
| 1369 unless ($self->{id}) { | |
| 1370 $self->{id} = ..get..some..id..; | |
| 1371 $WIDGET{$self->{id}} = $self; | |
| 1372 } | |
| 1373 | |
| 1374 { __widget__ => $self->{id} } | |
| 1375 } | |
| 1376 | |
| 1377 | |
| 1378 =head2 shrink | |
| 1379 | |
| 1380 $json = $json->shrink([$enable]) | |
| 1381 | |
| 1382 $enabled = $json->get_shrink | |
| 1383 | |
| 1384 With JSON::XS, this flag resizes strings generated by either | |
| 1385 C<encode> or C<decode> to their minimum size possible. This can save | |
| 1386 memory when your JSON texts are either very very long or you have many | |
| 1387 short strings. It will also try to downgrade any strings to octet-form | |
| 1388 if possible: perl stores strings internally either in an encoding called | |
| 1389 UTF-X or in octet-form. The latter cannot store everything but uses less | |
| 1390 space in general (and some buggy Perl or C code might even rely on that | |
| 1391 internal representation being used). | |
| 1392 | |
| 1393 With JSON::PP, it is noop about resizing strings but tries | |
| 1394 C<utf8::downgrade> to the returned string by C<encode>. See to L<utf8>. | |
| 1395 | |
| 1396 See to L<JSON::XS/OBJECT-ORIENTED INTERFACE> and L<JSON::PP/METHODS>. | |
| 1397 | |
| 1398 =head2 max_depth | |
| 1399 | |
| 1400 $json = $json->max_depth([$maximum_nesting_depth]) | |
| 1401 | |
| 1402 $max_depth = $json->get_max_depth | |
| 1403 | |
| 1404 Sets the maximum nesting level (default C<512>) accepted while encoding | |
| 1405 or decoding. If a higher nesting level is detected in JSON text or a Perl | |
| 1406 data structure, then the encoder and decoder will stop and croak at that | |
| 1407 point. | |
| 1408 | |
| 1409 Nesting level is defined by number of hash- or arrayrefs that the encoder | |
| 1410 needs to traverse to reach a given point or the number of C<{> or C<[> | |
| 1411 characters without their matching closing parenthesis crossed to reach a | |
| 1412 given character in a string. | |
| 1413 | |
| 1414 If no argument is given, the highest possible setting will be used, which | |
| 1415 is rarely useful. | |
| 1416 | |
| 1417 Note that nesting is implemented by recursion in C. The default value has | |
| 1418 been chosen to be as large as typical operating systems allow without | |
| 1419 crashing. (JSON::XS) | |
| 1420 | |
| 1421 With JSON::PP as the backend, when a large value (100 or more) was set and | |
| 1422 it de/encodes a deep nested object/text, it may raise a warning | |
| 1423 'Deep recursion on subroutine' at the perl runtime phase. | |
| 1424 | |
| 1425 See L<JSON::XS/SECURITY CONSIDERATIONS> for more info on why this is useful. | |
| 1426 | |
| 1427 =head2 max_size | |
| 1428 | |
| 1429 $json = $json->max_size([$maximum_string_size]) | |
| 1430 | |
| 1431 $max_size = $json->get_max_size | |
| 1432 | |
| 1433 Set the maximum length a JSON text may have (in bytes) where decoding is | |
| 1434 being attempted. The default is C<0>, meaning no limit. When C<decode> | |
| 1435 is called on a string that is longer then this many bytes, it will not | |
| 1436 attempt to decode the string but throw an exception. This setting has no | |
| 1437 effect on C<encode> (yet). | |
| 1438 | |
| 1439 If no argument is given, the limit check will be deactivated (same as when | |
| 1440 C<0> is specified). | |
| 1441 | |
| 1442 See L<JSON::XS/SECURITY CONSIDERATIONS>, below, for more info on why this is use
ful. | |
| 1443 | |
| 1444 =head2 encode | |
| 1445 | |
| 1446 $json_text = $json->encode($perl_scalar) | |
| 1447 | |
| 1448 Converts the given Perl data structure (a simple scalar or a reference | |
| 1449 to a hash or array) to its JSON representation. Simple scalars will be | |
| 1450 converted into JSON string or number sequences, while references to arrays | |
| 1451 become JSON arrays and references to hashes become JSON objects. Undefined | |
| 1452 Perl values (e.g. C<undef>) become JSON C<null> values. | |
| 1453 References to the integers C<0> and C<1> are converted into C<true> and C<false>
. | |
| 1454 | |
| 1455 =head2 decode | |
| 1456 | |
| 1457 $perl_scalar = $json->decode($json_text) | |
| 1458 | |
| 1459 The opposite of C<encode>: expects a JSON text and tries to parse it, | |
| 1460 returning the resulting simple scalar or reference. Croaks on error. | |
| 1461 | |
| 1462 JSON numbers and strings become simple Perl scalars. JSON arrays become | |
| 1463 Perl arrayrefs and JSON objects become Perl hashrefs. C<true> becomes | |
| 1464 C<1> (C<JSON::true>), C<false> becomes C<0> (C<JSON::false>) and | |
| 1465 C<null> becomes C<undef>. | |
| 1466 | |
| 1467 =head2 decode_prefix | |
| 1468 | |
| 1469 ($perl_scalar, $characters) = $json->decode_prefix($json_text) | |
| 1470 | |
| 1471 This works like the C<decode> method, but instead of raising an exception | |
| 1472 when there is trailing garbage after the first JSON object, it will | |
| 1473 silently stop parsing there and return the number of characters consumed | |
| 1474 so far. | |
| 1475 | |
| 1476 JSON->new->decode_prefix ("[1] the tail") | |
| 1477 => ([], 3) | |
| 1478 | |
| 1479 See to L<JSON::XS/OBJECT-ORIENTED INTERFACE> | |
| 1480 | |
| 1481 =head2 property | |
| 1482 | |
| 1483 $boolean = $json->property($property_name) | |
| 1484 | |
| 1485 Returns a boolean value about above some properties. | |
| 1486 | |
| 1487 The available properties are C<ascii>, C<latin1>, C<utf8>, | |
| 1488 C<indent>,C<space_before>, C<space_after>, C<relaxed>, C<canonical>, | |
| 1489 C<allow_nonref>, C<allow_unknown>, C<allow_blessed>, C<convert_blessed>, | |
| 1490 C<shrink>, C<max_depth> and C<max_size>. | |
| 1491 | |
| 1492 $boolean = $json->property('utf8'); | |
| 1493 => 0 | |
| 1494 $json->utf8; | |
| 1495 $boolean = $json->property('utf8'); | |
| 1496 => 1 | |
| 1497 | |
| 1498 Sets the property with a given boolean value. | |
| 1499 | |
| 1500 $json = $json->property($property_name => $boolean); | |
| 1501 | |
| 1502 With no argument, it returns all the above properties as a hash reference. | |
| 1503 | |
| 1504 $flag_hashref = $json->property(); | |
| 1505 | |
| 1506 =head1 INCREMENTAL PARSING | |
| 1507 | |
| 1508 Most of this section are copied and modified from L<JSON::XS/INCREMENTAL PARSING
>. | |
| 1509 | |
| 1510 In some cases, there is the need for incremental parsing of JSON texts. | |
| 1511 This module does allow you to parse a JSON stream incrementally. | |
| 1512 It does so by accumulating text until it has a full JSON object, which | |
| 1513 it then can decode. This process is similar to using C<decode_prefix> | |
| 1514 to see if a full JSON object is available, but is much more efficient | |
| 1515 (and can be implemented with a minimum of method calls). | |
| 1516 | |
| 1517 The backend module will only attempt to parse the JSON text once it is sure it | |
| 1518 has enough text to get a decisive result, using a very simple but | |
| 1519 truly incremental parser. This means that it sometimes won't stop as | |
| 1520 early as the full parser, for example, it doesn't detect parenthesis | |
| 1521 mismatches. The only thing it guarantees is that it starts decoding as | |
| 1522 soon as a syntactically valid JSON text has been seen. This means you need | |
| 1523 to set resource limits (e.g. C<max_size>) to ensure the parser will stop | |
| 1524 parsing in the presence if syntax errors. | |
| 1525 | |
| 1526 The following methods implement this incremental parser. | |
| 1527 | |
| 1528 =head2 incr_parse | |
| 1529 | |
| 1530 $json->incr_parse( [$string] ) # void context | |
| 1531 | |
| 1532 $obj_or_undef = $json->incr_parse( [$string] ) # scalar context | |
| 1533 | |
| 1534 @obj_or_empty = $json->incr_parse( [$string] ) # list context | |
| 1535 | |
| 1536 This is the central parsing function. It can both append new text and | |
| 1537 extract objects from the stream accumulated so far (both of these | |
| 1538 functions are optional). | |
| 1539 | |
| 1540 If C<$string> is given, then this string is appended to the already | |
| 1541 existing JSON fragment stored in the C<$json> object. | |
| 1542 | |
| 1543 After that, if the function is called in void context, it will simply | |
| 1544 return without doing anything further. This can be used to add more text | |
| 1545 in as many chunks as you want. | |
| 1546 | |
| 1547 If the method is called in scalar context, then it will try to extract | |
| 1548 exactly I<one> JSON object. If that is successful, it will return this | |
| 1549 object, otherwise it will return C<undef>. If there is a parse error, | |
| 1550 this method will croak just as C<decode> would do (one can then use | |
| 1551 C<incr_skip> to skip the erroneous part). This is the most common way of | |
| 1552 using the method. | |
| 1553 | |
| 1554 And finally, in list context, it will try to extract as many objects | |
| 1555 from the stream as it can find and return them, or the empty list | |
| 1556 otherwise. For this to work, there must be no separators between the JSON | |
| 1557 objects or arrays, instead they must be concatenated back-to-back. If | |
| 1558 an error occurs, an exception will be raised as in the scalar context | |
| 1559 case. Note that in this case, any previously-parsed JSON texts will be | |
| 1560 lost. | |
| 1561 | |
| 1562 Example: Parse some JSON arrays/objects in a given string and return them. | |
| 1563 | |
| 1564 my @objs = JSON->new->incr_parse ("[5][7][1,2]"); | |
| 1565 | |
| 1566 =head2 incr_text | |
| 1567 | |
| 1568 $lvalue_string = $json->incr_text | |
| 1569 | |
| 1570 This method returns the currently stored JSON fragment as an lvalue, that | |
| 1571 is, you can manipulate it. This I<only> works when a preceding call to | |
| 1572 C<incr_parse> in I<scalar context> successfully returned an object. Under | |
| 1573 all other circumstances you must not call this function (I mean it. | |
| 1574 although in simple tests it might actually work, it I<will> fail under | |
| 1575 real world conditions). As a special exception, you can also call this | |
| 1576 method before having parsed anything. | |
| 1577 | |
| 1578 This function is useful in two cases: a) finding the trailing text after a | |
| 1579 JSON object or b) parsing multiple JSON objects separated by non-JSON text | |
| 1580 (such as commas). | |
| 1581 | |
| 1582 $json->incr_text =~ s/\s*,\s*//; | |
| 1583 | |
| 1584 In Perl 5.005, C<lvalue> attribute is not available. | |
| 1585 You must write codes like the below: | |
| 1586 | |
| 1587 $string = $json->incr_text; | |
| 1588 $string =~ s/\s*,\s*//; | |
| 1589 $json->incr_text( $string ); | |
| 1590 | |
| 1591 =head2 incr_skip | |
| 1592 | |
| 1593 $json->incr_skip | |
| 1594 | |
| 1595 This will reset the state of the incremental parser and will remove the | |
| 1596 parsed text from the input buffer. This is useful after C<incr_parse> | |
| 1597 died, in which case the input buffer and incremental parser state is left | |
| 1598 unchanged, to skip the text parsed so far and to reset the parse state. | |
| 1599 | |
| 1600 =head2 incr_reset | |
| 1601 | |
| 1602 $json->incr_reset | |
| 1603 | |
| 1604 This completely resets the incremental parser, that is, after this call, | |
| 1605 it will be as if the parser had never parsed anything. | |
| 1606 | |
| 1607 This is useful if you want to repeatedly parse JSON objects and want to | |
| 1608 ignore any trailing data, which means you have to reset the parser after | |
| 1609 each successful decode. | |
| 1610 | |
| 1611 See to L<JSON::XS/INCREMENTAL PARSING> for examples. | |
| 1612 | |
| 1613 | |
| 1614 =head1 JSON::PP SUPPORT METHODS | |
| 1615 | |
| 1616 The below methods are JSON::PP own methods, so when C<JSON> works | |
| 1617 with JSON::PP (i.e. the created object is a JSON::PP object), available. | |
| 1618 See to L<JSON::PP/JSON::PP OWN METHODS> in detail. | |
| 1619 | |
| 1620 If you use C<JSON> with additional C<-support_by_pp>, some methods | |
| 1621 are available even with JSON::XS. See to L<USE PP FEATURES EVEN THOUGH XS BACKEN
D>. | |
| 1622 | |
| 1623 BEING { $ENV{PERL_JSON_BACKEND} = 'JSON::XS' } | |
| 1624 | |
| 1625 use JSON -support_by_pp; | |
| 1626 | |
| 1627 my $json = JSON->new; | |
| 1628 $json->allow_nonref->escape_slash->encode("/"); | |
| 1629 | |
| 1630 # functional interfaces too. | |
| 1631 print to_json(["/"], {escape_slash => 1}); | |
| 1632 print from_json('["foo"]', {utf8 => 1}); | |
| 1633 | |
| 1634 If you do not want to all functions but C<-support_by_pp>, | |
| 1635 use C<-no_export>. | |
| 1636 | |
| 1637 use JSON -support_by_pp, -no_export; | |
| 1638 # functional interfaces are not exported. | |
| 1639 | |
| 1640 =head2 allow_singlequote | |
| 1641 | |
| 1642 $json = $json->allow_singlequote([$enable]) | |
| 1643 | |
| 1644 If C<$enable> is true (or missing), then C<decode> will accept | |
| 1645 any JSON strings quoted by single quotations that are invalid JSON | |
| 1646 format. | |
| 1647 | |
| 1648 $json->allow_singlequote->decode({"foo":'bar'}); | |
| 1649 $json->allow_singlequote->decode({'foo':"bar"}); | |
| 1650 $json->allow_singlequote->decode({'foo':'bar'}); | |
| 1651 | |
| 1652 As same as the C<relaxed> option, this option may be used to parse | |
| 1653 application-specific files written by humans. | |
| 1654 | |
| 1655 =head2 allow_barekey | |
| 1656 | |
| 1657 $json = $json->allow_barekey([$enable]) | |
| 1658 | |
| 1659 If C<$enable> is true (or missing), then C<decode> will accept | |
| 1660 bare keys of JSON object that are invalid JSON format. | |
| 1661 | |
| 1662 As same as the C<relaxed> option, this option may be used to parse | |
| 1663 application-specific files written by humans. | |
| 1664 | |
| 1665 $json->allow_barekey->decode('{foo:"bar"}'); | |
| 1666 | |
| 1667 =head2 allow_bignum | |
| 1668 | |
| 1669 $json = $json->allow_bignum([$enable]) | |
| 1670 | |
| 1671 If C<$enable> is true (or missing), then C<decode> will convert | |
| 1672 the big integer Perl cannot handle as integer into a L<Math::BigInt> | |
| 1673 object and convert a floating number (any) into a L<Math::BigFloat>. | |
| 1674 | |
| 1675 On the contrary, C<encode> converts C<Math::BigInt> objects and C<Math::BigFloat
> | |
| 1676 objects into JSON numbers with C<allow_blessed> enable. | |
| 1677 | |
| 1678 $json->allow_nonref->allow_blessed->allow_bignum; | |
| 1679 $bigfloat = $json->decode('2.000000000000000000000000001'); | |
| 1680 print $json->encode($bigfloat); | |
| 1681 # => 2.000000000000000000000000001 | |
| 1682 | |
| 1683 See to L<MAPPING> about the conversion of JSON number. | |
| 1684 | |
| 1685 =head2 loose | |
| 1686 | |
| 1687 $json = $json->loose([$enable]) | |
| 1688 | |
| 1689 The unescaped [\x00-\x1f\x22\x2f\x5c] strings are invalid in JSON strings | |
| 1690 and the module doesn't allow to C<decode> to these (except for \x2f). | |
| 1691 If C<$enable> is true (or missing), then C<decode> will accept these | |
| 1692 unescaped strings. | |
| 1693 | |
| 1694 $json->loose->decode(qq|["abc | |
| 1695 def"]|); | |
| 1696 | |
| 1697 See to L<JSON::PP/JSON::PP OWN METHODS>. | |
| 1698 | |
| 1699 =head2 escape_slash | |
| 1700 | |
| 1701 $json = $json->escape_slash([$enable]) | |
| 1702 | |
| 1703 According to JSON Grammar, I<slash> (U+002F) is escaped. But by default | |
| 1704 JSON backend modules encode strings without escaping slash. | |
| 1705 | |
| 1706 If C<$enable> is true (or missing), then C<encode> will escape slashes. | |
| 1707 | |
| 1708 =head2 indent_length | |
| 1709 | |
| 1710 $json = $json->indent_length($length) | |
| 1711 | |
| 1712 With JSON::XS, The indent space length is 3 and cannot be changed. | |
| 1713 With JSON::PP, it sets the indent space length with the given $length. | |
| 1714 The default is 3. The acceptable range is 0 to 15. | |
| 1715 | |
| 1716 =head2 sort_by | |
| 1717 | |
| 1718 $json = $json->sort_by($function_name) | |
| 1719 $json = $json->sort_by($subroutine_ref) | |
| 1720 | |
| 1721 If $function_name or $subroutine_ref are set, its sort routine are used. | |
| 1722 | |
| 1723 $js = $pc->sort_by(sub { $JSON::PP::a cmp $JSON::PP::b })->encode($obj); | |
| 1724 # is($js, q|{"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8,"i":9}|); | |
| 1725 | |
| 1726 $js = $pc->sort_by('own_sort')->encode($obj); | |
| 1727 # is($js, q|{"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8,"i":9}|); | |
| 1728 | |
| 1729 sub JSON::PP::own_sort { $JSON::PP::a cmp $JSON::PP::b } | |
| 1730 | |
| 1731 As the sorting routine runs in the JSON::PP scope, the given | |
| 1732 subroutine name and the special variables C<$a>, C<$b> will begin | |
| 1733 with 'JSON::PP::'. | |
| 1734 | |
| 1735 If $integer is set, then the effect is same as C<canonical> on. | |
| 1736 | |
| 1737 See to L<JSON::PP/JSON::PP OWN METHODS>. | |
| 1738 | |
| 1739 =head1 MAPPING | |
| 1740 | |
| 1741 This section is copied from JSON::XS and modified to C<JSON>. | |
| 1742 JSON::XS and JSON::PP mapping mechanisms are almost equivalent. | |
| 1743 | |
| 1744 See to L<JSON::XS/MAPPING>. | |
| 1745 | |
| 1746 =head2 JSON -> PERL | |
| 1747 | |
| 1748 =over 4 | |
| 1749 | |
| 1750 =item object | |
| 1751 | |
| 1752 A JSON object becomes a reference to a hash in Perl. No ordering of object | |
| 1753 keys is preserved (JSON does not preserver object key ordering itself). | |
| 1754 | |
| 1755 =item array | |
| 1756 | |
| 1757 A JSON array becomes a reference to an array in Perl. | |
| 1758 | |
| 1759 =item string | |
| 1760 | |
| 1761 A JSON string becomes a string scalar in Perl - Unicode codepoints in JSON | |
| 1762 are represented by the same codepoints in the Perl string, so no manual | |
| 1763 decoding is necessary. | |
| 1764 | |
| 1765 =item number | |
| 1766 | |
| 1767 A JSON number becomes either an integer, numeric (floating point) or | |
| 1768 string scalar in perl, depending on its range and any fractional parts. On | |
| 1769 the Perl level, there is no difference between those as Perl handles all | |
| 1770 the conversion details, but an integer may take slightly less memory and | |
| 1771 might represent more values exactly than floating point numbers. | |
| 1772 | |
| 1773 If the number consists of digits only, C<JSON> will try to represent | |
| 1774 it as an integer value. If that fails, it will try to represent it as | |
| 1775 a numeric (floating point) value if that is possible without loss of | |
| 1776 precision. Otherwise it will preserve the number as a string value (in | |
| 1777 which case you lose roundtripping ability, as the JSON number will be | |
| 1778 re-encoded to a JSON string). | |
| 1779 | |
| 1780 Numbers containing a fractional or exponential part will always be | |
| 1781 represented as numeric (floating point) values, possibly at a loss of | |
| 1782 precision (in which case you might lose perfect roundtripping ability, but | |
| 1783 the JSON number will still be re-encoded as a JSON number). | |
| 1784 | |
| 1785 Note that precision is not accuracy - binary floating point values cannot | |
| 1786 represent most decimal fractions exactly, and when converting from and to | |
| 1787 floating point, C<JSON> only guarantees precision up to but not including | |
| 1788 the least significant bit. | |
| 1789 | |
| 1790 If the backend is JSON::PP and C<allow_bignum> is enable, the big integers | |
| 1791 and the numeric can be optionally converted into L<Math::BigInt> and | |
| 1792 L<Math::BigFloat> objects. | |
| 1793 | |
| 1794 =item true, false | |
| 1795 | |
| 1796 These JSON atoms become C<JSON::true> and C<JSON::false>, | |
| 1797 respectively. They are overloaded to act almost exactly like the numbers | |
| 1798 C<1> and C<0>. You can check whether a scalar is a JSON boolean by using | |
| 1799 the C<JSON::is_bool> function. | |
| 1800 | |
| 1801 If C<JSON::true> and C<JSON::false> are used as strings or compared as strings, | |
| 1802 they represent as C<true> and C<false> respectively. | |
| 1803 | |
| 1804 print JSON::true . "\n"; | |
| 1805 => true | |
| 1806 print JSON::true + 1; | |
| 1807 => 1 | |
| 1808 | |
| 1809 ok(JSON::true eq 'true'); | |
| 1810 ok(JSON::true eq '1'); | |
| 1811 ok(JSON::true == 1); | |
| 1812 | |
| 1813 C<JSON> will install these missing overloading features to the backend modules. | |
| 1814 | |
| 1815 | |
| 1816 =item null | |
| 1817 | |
| 1818 A JSON null atom becomes C<undef> in Perl. | |
| 1819 | |
| 1820 C<JSON::null> returns C<undef>. | |
| 1821 | |
| 1822 =back | |
| 1823 | |
| 1824 | |
| 1825 =head2 PERL -> JSON | |
| 1826 | |
| 1827 The mapping from Perl to JSON is slightly more difficult, as Perl is a | |
| 1828 truly typeless language, so we can only guess which JSON type is meant by | |
| 1829 a Perl value. | |
| 1830 | |
| 1831 =over 4 | |
| 1832 | |
| 1833 =item hash references | |
| 1834 | |
| 1835 Perl hash references become JSON objects. As there is no inherent ordering | |
| 1836 in hash keys (or JSON objects), they will usually be encoded in a | |
| 1837 pseudo-random order that can change between runs of the same program but | |
| 1838 stays generally the same within a single run of a program. C<JSON> | |
| 1839 optionally sort the hash keys (determined by the I<canonical> flag), so | |
| 1840 the same data structure will serialise to the same JSON text (given same | |
| 1841 settings and version of JSON::XS), but this incurs a runtime overhead | |
| 1842 and is only rarely useful, e.g. when you want to compare some JSON text | |
| 1843 against another for equality. | |
| 1844 | |
| 1845 In future, the ordered object feature will be added to JSON::PP using C<tie> mec
hanism. | |
| 1846 | |
| 1847 | |
| 1848 =item array references | |
| 1849 | |
| 1850 Perl array references become JSON arrays. | |
| 1851 | |
| 1852 =item other references | |
| 1853 | |
| 1854 Other unblessed references are generally not allowed and will cause an | |
| 1855 exception to be thrown, except for references to the integers C<0> and | |
| 1856 C<1>, which get turned into C<false> and C<true> atoms in JSON. You can | |
| 1857 also use C<JSON::false> and C<JSON::true> to improve readability. | |
| 1858 | |
| 1859 to_json [\0,JSON::true] # yields [false,true] | |
| 1860 | |
| 1861 =item JSON::true, JSON::false, JSON::null | |
| 1862 | |
| 1863 These special values become JSON true and JSON false values, | |
| 1864 respectively. You can also use C<\1> and C<\0> directly if you want. | |
| 1865 | |
| 1866 JSON::null returns C<undef>. | |
| 1867 | |
| 1868 =item blessed objects | |
| 1869 | |
| 1870 Blessed objects are not directly representable in JSON. See the | |
| 1871 C<allow_blessed> and C<convert_blessed> methods on various options on | |
| 1872 how to deal with this: basically, you can choose between throwing an | |
| 1873 exception, encoding the reference as if it weren't blessed, or provide | |
| 1874 your own serialiser method. | |
| 1875 | |
| 1876 With C<convert_blessed_universally> mode, C<encode> converts blessed | |
| 1877 hash references or blessed array references (contains other blessed references) | |
| 1878 into JSON members and arrays. | |
| 1879 | |
| 1880 use JSON -convert_blessed_universally; | |
| 1881 JSON->new->allow_blessed->convert_blessed->encode( $blessed_object ); | |
| 1882 | |
| 1883 See to L<convert_blessed>. | |
| 1884 | |
| 1885 =item simple scalars | |
| 1886 | |
| 1887 Simple Perl scalars (any scalar that is not a reference) are the most | |
| 1888 difficult objects to encode: JSON::XS and JSON::PP will encode undefined scalars
as | |
| 1889 JSON C<null> values, scalars that have last been used in a string context | |
| 1890 before encoding as JSON strings, and anything else as number value: | |
| 1891 | |
| 1892 # dump as number | |
| 1893 encode_json [2] # yields [2] | |
| 1894 encode_json [-3.0e17] # yields [-3e+17] | |
| 1895 my $value = 5; encode_json [$value] # yields [5] | |
| 1896 | |
| 1897 # used as string, so dump as string | |
| 1898 print $value; | |
| 1899 encode_json [$value] # yields ["5"] | |
| 1900 | |
| 1901 # undef becomes null | |
| 1902 encode_json [undef] # yields [null] | |
| 1903 | |
| 1904 You can force the type to be a string by stringifying it: | |
| 1905 | |
| 1906 my $x = 3.1; # some variable containing a number | |
| 1907 "$x"; # stringified | |
| 1908 $x .= ""; # another, more awkward way to stringify | |
| 1909 print $x; # perl does it for you, too, quite often | |
| 1910 | |
| 1911 You can force the type to be a number by numifying it: | |
| 1912 | |
| 1913 my $x = "3"; # some variable containing a string | |
| 1914 $x += 0; # numify it, ensuring it will be dumped as a number | |
| 1915 $x *= 1; # same thing, the choice is yours. | |
| 1916 | |
| 1917 You can not currently force the type in other, less obscure, ways. | |
| 1918 | |
| 1919 Note that numerical precision has the same meaning as under Perl (so | |
| 1920 binary to decimal conversion follows the same rules as in Perl, which | |
| 1921 can differ to other languages). Also, your perl interpreter might expose | |
| 1922 extensions to the floating point numbers of your platform, such as | |
| 1923 infinities or NaN's - these cannot be represented in JSON, and it is an | |
| 1924 error to pass those in. | |
| 1925 | |
| 1926 =item Big Number | |
| 1927 | |
| 1928 If the backend is JSON::PP and C<allow_bignum> is enable, | |
| 1929 C<encode> converts C<Math::BigInt> objects and C<Math::BigFloat> | |
| 1930 objects into JSON numbers. | |
| 1931 | |
| 1932 | |
| 1933 =back | |
| 1934 | |
| 1935 =head1 JSON and ECMAscript | |
| 1936 | |
| 1937 See to L<JSON::XS/JSON and ECMAscript>. | |
| 1938 | |
| 1939 =head1 JSON and YAML | |
| 1940 | |
| 1941 JSON is not a subset of YAML. | |
| 1942 See to L<JSON::XS/JSON and YAML>. | |
| 1943 | |
| 1944 | |
| 1945 =head1 BACKEND MODULE DECISION | |
| 1946 | |
| 1947 When you use C<JSON>, C<JSON> tries to C<use> JSON::XS. If this call failed, it
will | |
| 1948 C<uses> JSON::PP. The required JSON::XS version is I<2.2> or later. | |
| 1949 | |
| 1950 The C<JSON> constructor method returns an object inherited from the backend modu
le, | |
| 1951 and JSON::XS object is a blessed scalar reference while JSON::PP is a blessed ha
sh | |
| 1952 reference. | |
| 1953 | |
| 1954 So, your program should not depend on the backend module, especially | |
| 1955 returned objects should not be modified. | |
| 1956 | |
| 1957 my $json = JSON->new; # XS or PP? | |
| 1958 $json->{stash} = 'this is xs object'; # this code may raise an error! | |
| 1959 | |
| 1960 To check the backend module, there are some methods - C<backend>, C<is_pp> and C
<is_xs>. | |
| 1961 | |
| 1962 JSON->backend; # 'JSON::XS' or 'JSON::PP' | |
| 1963 | |
| 1964 JSON->backend->is_pp: # 0 or 1 | |
| 1965 | |
| 1966 JSON->backend->is_xs: # 1 or 0 | |
| 1967 | |
| 1968 $json->is_xs; # 1 or 0 | |
| 1969 | |
| 1970 $json->is_pp; # 0 or 1 | |
| 1971 | |
| 1972 | |
| 1973 If you set an environment variable C<PERL_JSON_BACKEND>, the calling action will
be changed. | |
| 1974 | |
| 1975 =over | |
| 1976 | |
| 1977 =item PERL_JSON_BACKEND = 0 or PERL_JSON_BACKEND = 'JSON::PP' | |
| 1978 | |
| 1979 Always use JSON::PP | |
| 1980 | |
| 1981 =item PERL_JSON_BACKEND == 1 or PERL_JSON_BACKEND = 'JSON::XS,JSON::PP' | |
| 1982 | |
| 1983 (The default) Use compiled JSON::XS if it is properly compiled & installed, | |
| 1984 otherwise use JSON::PP. | |
| 1985 | |
| 1986 =item PERL_JSON_BACKEND == 2 or PERL_JSON_BACKEND = 'JSON::XS' | |
| 1987 | |
| 1988 Always use compiled JSON::XS, die if it isn't properly compiled & installed. | |
| 1989 | |
| 1990 =item PERL_JSON_BACKEND = 'JSON::backportPP' | |
| 1991 | |
| 1992 Always use JSON::backportPP. | |
| 1993 JSON::backportPP is JSON::PP back port module. | |
| 1994 C<JSON> includes JSON::backportPP instead of JSON::PP. | |
| 1995 | |
| 1996 =back | |
| 1997 | |
| 1998 These ideas come from L<DBI::PurePerl> mechanism. | |
| 1999 | |
| 2000 example: | |
| 2001 | |
| 2002 BEGIN { $ENV{PERL_JSON_BACKEND} = 'JSON::PP' } | |
| 2003 use JSON; # always uses JSON::PP | |
| 2004 | |
| 2005 In future, it may be able to specify another module. | |
| 2006 | |
| 2007 =head1 USE PP FEATURES EVEN THOUGH XS BACKEND | |
| 2008 | |
| 2009 Many methods are available with either JSON::XS or JSON::PP and | |
| 2010 when the backend module is JSON::XS, if any JSON::PP specific (i.e. JSON::XS uns
upported) | |
| 2011 method is called, it will C<warn> and be noop. | |
| 2012 | |
| 2013 But If you C<use> C<JSON> passing the optional string C<-support_by_pp>, | |
| 2014 it makes a part of those unsupported methods available. | |
| 2015 This feature is achieved by using JSON::PP in C<de/encode>. | |
| 2016 | |
| 2017 BEGIN { $ENV{PERL_JSON_BACKEND} = 2 } # with JSON::XS | |
| 2018 use JSON -support_by_pp; | |
| 2019 my $json = JSON->new; | |
| 2020 $json->allow_nonref->escape_slash->encode("/"); | |
| 2021 | |
| 2022 At this time, the returned object is a C<JSON::Backend::XS::Supportable> | |
| 2023 object (re-blessed XS object), and by checking JSON::XS unsupported flags | |
| 2024 in de/encoding, can support some unsupported methods - C<loose>, C<allow_bignum>
, | |
| 2025 C<allow_barekey>, C<allow_singlequote>, C<escape_slash> and C<indent_length>. | |
| 2026 | |
| 2027 When any unsupported methods are not enable, C<XS de/encode> will be | |
| 2028 used as is. The switch is achieved by changing the symbolic tables. | |
| 2029 | |
| 2030 C<-support_by_pp> is effective only when the backend module is JSON::XS | |
| 2031 and it makes the de/encoding speed down a bit. | |
| 2032 | |
| 2033 See to L<JSON::PP SUPPORT METHODS>. | |
| 2034 | |
| 2035 =head1 INCOMPATIBLE CHANGES TO OLD VERSION | |
| 2036 | |
| 2037 There are big incompatibility between new version (2.00) and old (1.xx). | |
| 2038 If you use old C<JSON> 1.xx in your code, please check it. | |
| 2039 | |
| 2040 See to L<Transition ways from 1.xx to 2.xx.> | |
| 2041 | |
| 2042 =over | |
| 2043 | |
| 2044 =item jsonToObj and objToJson are obsoleted. | |
| 2045 | |
| 2046 Non Perl-style name C<jsonToObj> and C<objToJson> are obsoleted | |
| 2047 (but not yet deleted from the source). | |
| 2048 If you use these functions in your code, please replace them | |
| 2049 with C<from_json> and C<to_json>. | |
| 2050 | |
| 2051 | |
| 2052 =item Global variables are no longer available. | |
| 2053 | |
| 2054 C<JSON> class variables - C<$JSON::AUTOCONVERT>, C<$JSON::BareKey>, etc... | |
| 2055 - are not available any longer. | |
| 2056 Instead, various features can be used through object methods. | |
| 2057 | |
| 2058 | |
| 2059 =item Package JSON::Converter and JSON::Parser are deleted. | |
| 2060 | |
| 2061 Now C<JSON> bundles with JSON::PP which can handle JSON more properly than them. | |
| 2062 | |
| 2063 =item Package JSON::NotString is deleted. | |
| 2064 | |
| 2065 There was C<JSON::NotString> class which represents JSON value C<true>, C<false>
, C<null> | |
| 2066 and numbers. It was deleted and replaced by C<JSON::Boolean>. | |
| 2067 | |
| 2068 C<JSON::Boolean> represents C<true> and C<false>. | |
| 2069 | |
| 2070 C<JSON::Boolean> does not represent C<null>. | |
| 2071 | |
| 2072 C<JSON::null> returns C<undef>. | |
| 2073 | |
| 2074 C<JSON> makes L<JSON::XS::Boolean> and L<JSON::PP::Boolean> is-a relation | |
| 2075 to L<JSON::Boolean>. | |
| 2076 | |
| 2077 =item function JSON::Number is obsoleted. | |
| 2078 | |
| 2079 C<JSON::Number> is now needless because JSON::XS and JSON::PP have | |
| 2080 round-trip integrity. | |
| 2081 | |
| 2082 =item JSONRPC modules are deleted. | |
| 2083 | |
| 2084 Perl implementation of JSON-RPC protocol - C<JSONRPC >, C<JSONRPC::Transport::HT
TP> | |
| 2085 and C<Apache::JSONRPC > are deleted in this distribution. | |
| 2086 Instead of them, there is L<JSON::RPC> which supports JSON-RPC protocol version
1.1. | |
| 2087 | |
| 2088 =back | |
| 2089 | |
| 2090 =head2 Transition ways from 1.xx to 2.xx. | |
| 2091 | |
| 2092 You should set C<suport_by_pp> mode firstly, because | |
| 2093 it is always successful for the below codes even with JSON::XS. | |
| 2094 | |
| 2095 use JSON -support_by_pp; | |
| 2096 | |
| 2097 =over | |
| 2098 | |
| 2099 =item Exported jsonToObj (simple) | |
| 2100 | |
| 2101 from_json($json_text); | |
| 2102 | |
| 2103 =item Exported objToJson (simple) | |
| 2104 | |
| 2105 to_json($perl_scalar); | |
| 2106 | |
| 2107 =item Exported jsonToObj (advanced) | |
| 2108 | |
| 2109 $flags = {allow_barekey => 1, allow_singlequote => 1}; | |
| 2110 from_json($json_text, $flags); | |
| 2111 | |
| 2112 equivalent to: | |
| 2113 | |
| 2114 $JSON::BareKey = 1; | |
| 2115 $JSON::QuotApos = 1; | |
| 2116 jsonToObj($json_text); | |
| 2117 | |
| 2118 =item Exported objToJson (advanced) | |
| 2119 | |
| 2120 $flags = {allow_blessed => 1, allow_barekey => 1}; | |
| 2121 to_json($perl_scalar, $flags); | |
| 2122 | |
| 2123 equivalent to: | |
| 2124 | |
| 2125 $JSON::BareKey = 1; | |
| 2126 objToJson($perl_scalar); | |
| 2127 | |
| 2128 =item jsonToObj as object method | |
| 2129 | |
| 2130 $json->decode($json_text); | |
| 2131 | |
| 2132 =item objToJson as object method | |
| 2133 | |
| 2134 $json->encode($perl_scalar); | |
| 2135 | |
| 2136 =item new method with parameters | |
| 2137 | |
| 2138 The C<new> method in 2.x takes any parameters no longer. | |
| 2139 You can set parameters instead; | |
| 2140 | |
| 2141 $json = JSON->new->pretty; | |
| 2142 | |
| 2143 =item $JSON::Pretty, $JSON::Indent, $JSON::Delimiter | |
| 2144 | |
| 2145 If C<indent> is enable, that means C<$JSON::Pretty> flag set. And | |
| 2146 C<$JSON::Delimiter> was substituted by C<space_before> and C<space_after>. | |
| 2147 In conclusion: | |
| 2148 | |
| 2149 $json->indent->space_before->space_after; | |
| 2150 | |
| 2151 Equivalent to: | |
| 2152 | |
| 2153 $json->pretty; | |
| 2154 | |
| 2155 To change indent length, use C<indent_length>. | |
| 2156 | |
| 2157 (Only with JSON::PP, if C<-support_by_pp> is not used.) | |
| 2158 | |
| 2159 $json->pretty->indent_length(2)->encode($perl_scalar); | |
| 2160 | |
| 2161 =item $JSON::BareKey | |
| 2162 | |
| 2163 (Only with JSON::PP, if C<-support_by_pp> is not used.) | |
| 2164 | |
| 2165 $json->allow_barekey->decode($json_text) | |
| 2166 | |
| 2167 =item $JSON::ConvBlessed | |
| 2168 | |
| 2169 use C<-convert_blessed_universally>. See to L<convert_blessed>. | |
| 2170 | |
| 2171 =item $JSON::QuotApos | |
| 2172 | |
| 2173 (Only with JSON::PP, if C<-support_by_pp> is not used.) | |
| 2174 | |
| 2175 $json->allow_singlequote->decode($json_text) | |
| 2176 | |
| 2177 =item $JSON::SingleQuote | |
| 2178 | |
| 2179 Disable. C<JSON> does not make such a invalid JSON string any longer. | |
| 2180 | |
| 2181 =item $JSON::KeySort | |
| 2182 | |
| 2183 $json->canonical->encode($perl_scalar) | |
| 2184 | |
| 2185 This is the ascii sort. | |
| 2186 | |
| 2187 If you want to use with your own sort routine, check the C<sort_by> method. | |
| 2188 | |
| 2189 (Only with JSON::PP, even if C<-support_by_pp> is used currently.) | |
| 2190 | |
| 2191 $json->sort_by($sort_routine_ref)->encode($perl_scalar) | |
| 2192 | |
| 2193 $json->sort_by(sub { $JSON::PP::a <=> $JSON::PP::b })->encode($perl_scalar) | |
| 2194 | |
| 2195 Can't access C<$a> and C<$b> but C<$JSON::PP::a> and C<$JSON::PP::b>. | |
| 2196 | |
| 2197 =item $JSON::SkipInvalid | |
| 2198 | |
| 2199 $json->allow_unknown | |
| 2200 | |
| 2201 =item $JSON::AUTOCONVERT | |
| 2202 | |
| 2203 Needless. C<JSON> backend modules have the round-trip integrity. | |
| 2204 | |
| 2205 =item $JSON::UTF8 | |
| 2206 | |
| 2207 Needless because C<JSON> (JSON::XS/JSON::PP) sets | |
| 2208 the UTF8 flag on properly. | |
| 2209 | |
| 2210 # With UTF8-flagged strings | |
| 2211 | |
| 2212 $json->allow_nonref; | |
| 2213 $str = chr(1000); # UTF8-flagged | |
| 2214 | |
| 2215 $json_text = $json->utf8(0)->encode($str); | |
| 2216 utf8::is_utf8($json_text); | |
| 2217 # true | |
| 2218 $json_text = $json->utf8(1)->encode($str); | |
| 2219 utf8::is_utf8($json_text); | |
| 2220 # false | |
| 2221 | |
| 2222 $str = '"' . chr(1000) . '"'; # UTF8-flagged | |
| 2223 | |
| 2224 $perl_scalar = $json->utf8(0)->decode($str); | |
| 2225 utf8::is_utf8($perl_scalar); | |
| 2226 # true | |
| 2227 $perl_scalar = $json->utf8(1)->decode($str); | |
| 2228 # died because of 'Wide character in subroutine' | |
| 2229 | |
| 2230 See to L<JSON::XS/A FEW NOTES ON UNICODE AND PERL>. | |
| 2231 | |
| 2232 =item $JSON::UnMapping | |
| 2233 | |
| 2234 Disable. See to L<MAPPING>. | |
| 2235 | |
| 2236 =item $JSON::SelfConvert | |
| 2237 | |
| 2238 This option was deleted. | |
| 2239 Instead of it, if a given blessed object has the C<TO_JSON> method, | |
| 2240 C<TO_JSON> will be executed with C<convert_blessed>. | |
| 2241 | |
| 2242 $json->convert_blessed->encode($blessed_hashref_or_arrayref) | |
| 2243 # if need, call allow_blessed | |
| 2244 | |
| 2245 Note that it was C<toJson> in old version, but now not C<toJson> but C<TO_JSON>. | |
| 2246 | |
| 2247 =back | |
| 2248 | |
| 2249 =head1 TODO | |
| 2250 | |
| 2251 =over | |
| 2252 | |
| 2253 =item example programs | |
| 2254 | |
| 2255 =back | |
| 2256 | |
| 2257 =head1 THREADS | |
| 2258 | |
| 2259 No test with JSON::PP. If with JSON::XS, See to L<JSON::XS/THREADS>. | |
| 2260 | |
| 2261 | |
| 2262 =head1 BUGS | |
| 2263 | |
| 2264 Please report bugs relevant to C<JSON> to E<lt>makamaka[at]cpan.orgE<gt>. | |
| 2265 | |
| 2266 | |
| 2267 =head1 SEE ALSO | |
| 2268 | |
| 2269 Most of the document is copied and modified from JSON::XS doc. | |
| 2270 | |
| 2271 L<JSON::XS>, L<JSON::PP> | |
| 2272 | |
| 2273 C<RFC4627>(L<http://www.ietf.org/rfc/rfc4627.txt>) | |
| 2274 | |
| 2275 =head1 AUTHOR | |
| 2276 | |
| 2277 Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt> | |
| 2278 | |
| 2279 JSON::XS was written by Marc Lehmann <schmorp[at]schmorp.de> | |
| 2280 | |
| 2281 The release of this new version owes to the courtesy of Marc Lehmann. | |
| 2282 | |
| 2283 | |
| 2284 =head1 COPYRIGHT AND LICENSE | |
| 2285 | |
| 2286 Copyright 2005-2013 by Makamaka Hannyaharamitu | |
| 2287 | |
| 2288 This library is free software; you can redistribute it and/or modify | |
| 2289 it under the same terms as Perl itself. | |
| 2290 | |
| 2291 =cut | |
| 2292 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 16539003:
Revert 205057 "Add JSON.pm to third_party" (Closed)
Base URL: svn://svn.chromium.org/chrome/