includes/json/Services_JSON.php

   1 <?php
   2 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
   3
   4 /**
   5 * Converts to and from JSON format.
   6 *
   7 * JSON (JavaScript Object Notation) is a lightweight data-interchange
   8 * format. It is easy for humans to read and write. It is easy for machines
   9 * to parse and generate. It is based on a subset of the JavaScript
  10 * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
  11 * This feature can also be found in  Python. JSON is a text format that is
  12 * completely language independent but uses conventions that are familiar
  13 * to programmers of the C-family of languages, including C, C++, C#, Java,
  14 * JavaScript, Perl, TCL, and many others. These properties make JSON an
  15 * ideal data-interchange language.
  16 *
  17 * This package provides a simple encoder and decoder for JSON notation. It
  18 * is intended for use with client-side Javascript applications that make
  19 * use of HTTPRequest to perform server communication functions - data can
  20 * be encoded into JSON notation for use in a client-side javascript, or
  21 * decoded from incoming Javascript requests. JSON format is native to
  22 * Javascript, and can be directly eval()'ed with no further parsing
  23 * overhead
  24 *
  25 * All strings should be in ASCII or UTF-8 format!
  26 *
  27 * LICENSE: Redistribution and use in source and binary forms, with or
  28 * without modification, are permitted provided that the following
  29 * conditions are met: Redistributions of source code must retain the
  30 * above copyright notice, this list of conditions and the following
  31 * disclaimer. Redistributions in binary form must reproduce the above
  32 * copyright notice, this list of conditions and the following disclaimer
  33 * in the documentation and/or other materials provided with the
  34 * distribution.
  35 *
  36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  38 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  39 * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  40 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  41 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  42 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  44 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  45 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  46 * DAMAGE.
  47 *
  48 * @ingroup API
  49 * @author Michal Migurski <mike-json@teczno.com>
  50 * @author Matt Knapp <mdknapp[at]gmail[dot]com>
  51 * @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
  52 * @copyright 2005 Michal Migurski
  53 * @version CVS: $Id: Services_JSON.php 79562 2011-01-04 06:15:54Z tstarling $
  54 * @license http://www.opensource.org/licenses/bsd-license.php
  55 * @see http://pear.php.net/pepr/pepr-proposal-show.php?id=198
  56 */
  57
  58 /**
  59 * Marker constant for Services_JSON::decode(), used to flag stack state
  60 */
  61 define('SERVICES_JSON_SLICE',   1);
  62
  63 /**
  64 * Marker constant for Services_JSON::decode(), used to flag stack state
  65 */
  66 define('SERVICES_JSON_IN_STR',  2);
  67
  68 /**
  69 * Marker constant for Services_JSON::decode(), used to flag stack state
  70 */
  71 define('SERVICES_JSON_IN_ARR',  3);
  72
  73 /**
  74 * Marker constant for Services_JSON::decode(), used to flag stack state
  75 */
  76 define('SERVICES_JSON_IN_OBJ',  4);
  77
  78 /**
  79 * Marker constant for Services_JSON::decode(), used to flag stack state
  80 */
  81 define('SERVICES_JSON_IN_CMT', 5);
  82
  83 /**
  84 * Behavior switch for Services_JSON::decode()
  85 */
  86 define('SERVICES_JSON_LOOSE_TYPE', 16);
  87
  88 /**
  89 * Behavior switch for Services_JSON::decode()
  90 */
  91 define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
  92
  93 /**
  94  * Converts to and from JSON format.
  95  *
  96  * Brief example of use:
  97  *
  98  * <code>
  99  * // create a new instance of Services_JSON
 100  * $json = new Services_JSON();
 101  *
 102  * // convert a complexe value to JSON notation, and send it to the browser
 103  * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
 104  * $output = $json->encode($value);
 105  *
 106  * print($output);
 107  * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
 108  *
 109  * // accept incoming POST data, assumed to be in JSON notation
 110  * $input = file_get_contents('php://input', 1000000);
 111  * $value = $json->decode($input);
 112  * </code>
 113  *
 114  * @ingroup API
 115  */
 116 class Services_JSON
 117 {
 118         /**
 119          * constructs a new JSON instance
 120          *
 121          * @param int $use object behavior flags; combine with boolean-OR
 122          *
 123          *      possible values:
 124          *      - SERVICES_JSON_LOOSE_TYPE:  loose typing.
 125          *                      "{...}" syntax creates associative arrays
 126          *                      instead of objects in decode().
 127          *      - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
 128          *                      Values which can't be encoded (e.g. resources)
 129          *                      appear as NULL instead of throwing errors.
 130          *                      By default, a deeply-nested resource will
 131          *                      bubble up with an error, so all return values
 132          *                      from encode() should be checked with isError()
 133          */
 134         function Services_JSON($use = 0)
 135         {
 136                 $this->use = $use;
 137         }
 138
 139         private static $mHavePear = null;
 140         /**
 141          * Returns cached result of class_exists('pear'), to avoid calling AutoLoader numerous times
 142          * in cases when PEAR is not present.
 143          * @return boolean
 144          */
 145         private static function pearInstalled() {
 146                 if ( self::$mHavePear === null ) {
 147                         self::$mHavePear = class_exists( 'pear' );
 148                 }
 149                 return self::$mHavePear;
 150         }
 151
 152         /**
 153          * convert a string from one UTF-16 char to one UTF-8 char
 154          *
 155          * Normally should be handled by mb_convert_encoding, but
 156          * provides a slower PHP-only method for installations
 157          * that lack the multibye string extension.
 158          *
 159          * @param string  $utf16  UTF-16 character
 160          * @return string  UTF-8 character
 161          * @access private
 162          */
 163         function utf162utf8($utf16)
 164         {
 165                 // oh please oh please oh please oh please oh please
 166                 if(function_exists('mb_convert_encoding')) {
 167                         return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
 168                 }
 169
 170                 $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
 171
 172                 switch(true) {
 173                         case ((0x7F & $bytes) == $bytes):
 174                                 // this case should never be reached, because we are in ASCII range
 175                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 176                                 return chr(0x7F & $bytes);
 177
 178                         case (0x07FF & $bytes) == $bytes:
 179                                 // return a 2-byte UTF-8 character
 180                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 181                                 return chr(0xC0 | (($bytes >> 6) & 0x1F))
 182                                          . chr(0x80 | ($bytes & 0x3F));
 183
 184                         case (0xFC00 & $bytes) == 0xD800 && strlen($utf16) >= 4 && (0xFC & ord($utf16{2})) == 0xDC:
 185                                 // return a 4-byte UTF-8 character
 186                                 $char = ((($bytes & 0x03FF) << 10)
 187                                            | ((ord($utf16{2}) & 0x03) << 8)
 188                                            | ord($utf16{3}));
 189                                 $char += 0x10000;
 190                                 return chr(0xF0 | (($char >> 18) & 0x07))
 191                                          . chr(0x80 | (($char >> 12) & 0x3F))
 192                                          . chr(0x80 | (($char >> 6) & 0x3F))
 193                                          . chr(0x80 | ($char & 0x3F));
 194
 195                         case (0xFFFF & $bytes) == $bytes:
 196                                 // return a 3-byte UTF-8 character
 197                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 198                                 return chr(0xE0 | (($bytes >> 12) & 0x0F))
 199                                          . chr(0x80 | (($bytes >> 6) & 0x3F))
 200                                          . chr(0x80 | ($bytes & 0x3F));
 201                 }
 202
 203                 // ignoring UTF-32 for now, sorry
 204                 return '';
 205         }
 206
 207         /**
 208          * convert a string from one UTF-8 char to one UTF-16 char
 209          *
 210          * Normally should be handled by mb_convert_encoding, but
 211          * provides a slower PHP-only method for installations
 212          * that lack the multibye string extension.
 213          *
 214          * @param string  $utf8   UTF-8 character
 215          * @return string  UTF-16 character
 216          * @access private
 217          */
 218         function utf82utf16($utf8)
 219         {
 220                 // oh please oh please oh please oh please oh please
 221                 if(function_exists('mb_convert_encoding')) {
 222                         return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
 223                 }
 224
 225                 switch(strlen($utf8)) {
 226                         case 1:
 227                                 // this case should never be reached, because we are in ASCII range
 228                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 229                                 return $utf8;
 230
 231                         case 2:
 232                                 // return a UTF-16 character from a 2-byte UTF-8 char
 233                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 234                                 return chr(0x07 & (ord($utf8{0}) >> 2))
 235                                          . chr((0xC0 & (ord($utf8{0}) << 6))
 236                                                  | (0x3F & ord($utf8{1})));
 237
 238                         case 3:
 239                                 // return a UTF-16 character from a 3-byte UTF-8 char
 240                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 241                                 return chr((0xF0 & (ord($utf8{0}) << 4))
 242                                                  | (0x0F & (ord($utf8{1}) >> 2)))
 243                                          . chr((0xC0 & (ord($utf8{1}) << 6))
 244                                                  | (0x7F & ord($utf8{2})));
 245
 246                         case 4:
 247                                 // return a UTF-16 surrogate pair from a 4-byte UTF-8 char
 248                                 if(ord($utf8{0}) > 0xF4) return ''; # invalid
 249                                 $char = ((0x1C0000 & (ord($utf8{0}) << 18))
 250                                            | (0x03F000 & (ord($utf8{1}) << 12))
 251                                            | (0x000FC0 & (ord($utf8{2}) << 6))
 252                                            | (0x00003F & ord($utf8{3})));
 253                                 if($char > 0x10FFFF) return ''; # invalid
 254                                 $char -= 0x10000;
 255                                 return chr(0xD8 | (($char >> 18) & 0x03))
 256                                          . chr(($char >> 10) & 0xFF)
 257                                          . chr(0xDC | (($char >> 8) & 0x03))
 258                                          . chr($char & 0xFF);
 259                 }
 260
 261                 // ignoring UTF-32 for now, sorry
 262                 return '';
 263         }
 264
 265         /**
 266          * encodes an arbitrary variable into JSON format
 267          *
 268          * @param mixed $var any number, boolean, string, array, or object to be encoded.
 269          *                      see argument 1 to Services_JSON() above for array-parsing behavior.
 270          *                      if var is a strng, note that encode() always expects it
 271          *                      to be in ASCII or UTF-8 format!
 272          * @param bool $pretty pretty-print output with indents and newlines
 273          *
 274          * @return mixed JSON string representation of input var or an error if a problem occurs
 275          * @access public
 276          */
 277         function encode($var, $pretty=false)
 278         {
 279                 $this->indent = 0;
 280                 $this->pretty = $pretty;
 281                 $this->nameValSeparator = $pretty ? ': ' : ':';
 282                 return $this->encode2($var);
 283         }
 284
 285         /**
 286          * encodes an arbitrary variable into JSON format
 287          *
 288          * @param mixed $var any number, boolean, string, array, or object to be encoded.
 289          *                      see argument 1 to Services_JSON() above for array-parsing behavior.
 290          *                      if var is a strng, note that encode() always expects it
 291          *                      to be in ASCII or UTF-8 format!
 292          *
 293          * @return mixed JSON string representation of input var or an error if a problem occurs
 294          * @access private
 295          */
 296         function encode2($var)
 297         {
 298                 if ($this->pretty) {
 299                         $close = "\n" . str_repeat("\t", $this->indent);
 300                         $open = $close . "\t";
 301                         $mid = ',' . $open;
 302                 }
 303                 else {
 304                         $open = $close = '';
 305                         $mid = ',';
 306                 }
 307
 308                 switch (gettype($var)) {
 309                         case 'boolean':
 310                                 return $var ? 'true' : 'false';
 311
 312                         case 'NULL':
 313                                 return 'null';
 314
 315                         case 'integer':
 316                                 return (int) $var;
 317
 318                         case 'double':
 319                         case 'float':
 320                                 return (float) $var;
 321
 322                         case 'string':
 323                                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
 324                                 $ascii = '';
 325                                 $strlen_var = strlen($var);
 326
 327                            /*
 328                                 * Iterate over every character in the string,
 329                                 * escaping with a slash or encoding to UTF-8 where necessary
 330                                 */
 331                                 for ($c = 0; $c < $strlen_var; ++$c) {
 332
 333                                         $ord_var_c = ord($var{$c});
 334
 335                                         switch (true) {
 336                                                 case $ord_var_c == 0x08:
 337                                                         $ascii .= '\b';
 338                                                         break;
 339                                                 case $ord_var_c == 0x09:
 340                                                         $ascii .= '\t';
 341                                                         break;
 342                                                 case $ord_var_c == 0x0A:
 343                                                         $ascii .= '\n';
 344                                                         break;
 345                                                 case $ord_var_c == 0x0C:
 346                                                         $ascii .= '\f';
 347                                                         break;
 348                                                 case $ord_var_c == 0x0D:
 349                                                         $ascii .= '\r';
 350                                                         break;
 351
 352                                                 case $ord_var_c == 0x22:
 353                                                 case $ord_var_c == 0x2F:
 354                                                 case $ord_var_c == 0x5C:
 355                                                         // double quote, slash, slosh
 356                                                         $ascii .= '\\'.$var{$c};
 357                                                         break;
 358
 359                                                 case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
 360                                                         // characters U-00000000 - U-0000007F (same as ASCII)
 361                                                         $ascii .= $var{$c};
 362                                                         break;
 363
 364                                                 case (($ord_var_c & 0xE0) == 0xC0):
 365                                                         // characters U-00000080 - U-000007FF, mask 110XXXXX
 366                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 367                                                         $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
 368                                                         $c += 1;
 369                                                         $utf16 = $this->utf82utf16($char);
 370                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
 371                                                         break;
 372
 373                                                 case (($ord_var_c & 0xF0) == 0xE0):
 374                                                         // characters U-00000800 - U-0000FFFF, mask 1110XXXX
 375                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 376                                                         $char = pack('C*', $ord_var_c,
 377                                                                         ord($var{$c + 1}),
 378                                                                         ord($var{$c + 2}));
 379                                                         $c += 2;
 380                                                         $utf16 = $this->utf82utf16($char);
 381                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
 382                                                         break;
 383
 384                                                 case (($ord_var_c & 0xF8) == 0xF0):
 385                                                         // characters U-00010000 - U-001FFFFF, mask 11110XXX
 386                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 387                                                         // These will always return a surrogate pair
 388                                                         $char = pack('C*', $ord_var_c,
 389                                                                         ord($var{$c + 1}),
 390                                                                         ord($var{$c + 2}),
 391                                                                         ord($var{$c + 3}));
 392                                                         $c += 3;
 393                                                         $utf16 = $this->utf82utf16($char);
 394                                                         if($utf16 == '') {
 395                                                                 $ascii .= '\ufffd';
 396                                                         } else {
 397                                                                 $utf16 = str_split($utf16, 2);
 398                                                                 $ascii .= sprintf('\u%04s\u%04s', bin2hex($utf16[0]), bin2hex($utf16[1]));
 399                                                         }
 400                                                         break;
 401                                         }
 402                                 }
 403
 404                                 return '"'.$ascii.'"';
 405
 406                         case 'array':
 407                            /*
 408                                 * As per JSON spec if any array key is not an integer
 409                                 * we must treat the the whole array as an object. We
 410                                 * also try to catch a sparsely populated associative
 411                                 * array with numeric keys here because some JS engines
 412                                 * will create an array with empty indexes up to
 413                                 * max_index which can cause memory issues and because
 414                                 * the keys, which may be relevant, will be remapped
 415                                 * otherwise.
 416                                 *
 417                                 * As per the ECMA and JSON specification an object may
 418                                 * have any string as a property. Unfortunately due to
 419                                 * a hole in the ECMA specification if the key is a
 420                                 * ECMA reserved word or starts with a digit the
 421                                 * parameter is only accessible using ECMAScript's
 422                                 * bracket notation.
 423                                 */
 424
 425                                 // treat as a JSON object
 426                                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
 427                                         $this->indent++;
 428                                         $properties = array_map(array($this, 'name_value'),
 429                                                                 array_keys($var),
 430                                                                 array_values($var));
 431                                         $this->indent--;
 432
 433                                         foreach($properties as $property) {
 434                                                 if(Services_JSON::isError($property)) {
 435                                                         return $property;
 436                                                 }
 437                                         }
 438
 439                                         return '{' . $open . join($mid, $properties) . $close . '}';
 440                                 }
 441
 442                                 // treat it like a regular array
 443                                 $this->indent++;
 444                                 $elements = array_map(array($this, 'encode2'), $var);
 445                                 $this->indent--;
 446
 447                                 foreach($elements as $element) {
 448                                         if(Services_JSON::isError($element)) {
 449                                                 return $element;
 450                                         }
 451                                 }
 452
 453                                 return '[' . $open . join($mid, $elements) . $close . ']';
 454
 455                         case 'object':
 456                                 $vars = get_object_vars($var);
 457
 458                                 $this->indent++;
 459                                 $properties = array_map(array($this, 'name_value'),
 460                                                         array_keys($vars),
 461                                                         array_values($vars));
 462                                 $this->indent--;
 463
 464                                 foreach($properties as $property) {
 465                                         if(Services_JSON::isError($property)) {
 466                                                 return $property;
 467                                         }
 468                                 }
 469
 470                                 return '{' . $open . join($mid, $properties) . $close . '}';
 471
 472                         default:
 473                                 return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
 474                                         ? 'null'
 475                                         : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
 476                 }
 477         }
 478
 479         /**
 480          * array-walking function for use in generating JSON-formatted name-value pairs
 481          *
 482          * @param string $name name of key to use
 483          * @param mixed $value reference to an array element to be encoded
 484          *
 485          * @return string JSON-formatted name-value pair, like '"name":value'
 486          * @access private
 487          */
 488         function name_value($name, $value)
 489         {
 490                 $encoded_value = $this->encode2($value);
 491
 492                 if(Services_JSON::isError($encoded_value)) {
 493                         return $encoded_value;
 494                 }
 495
 496                 return $this->encode2(strval($name)) . $this->nameValSeparator . $encoded_value;
 497         }
 498
 499         /**
 500          * reduce a string by removing leading and trailing comments and whitespace
 501          *
 502          * @param $str string string value to strip of comments and whitespace
 503          *
 504          * @return string string value stripped of comments and whitespace
 505          * @access private
 506          */
 507         function reduce_string($str)
 508         {
 509                 $str = preg_replace(array(
 510
 511                                 // eliminate single line comments in '// ...' form
 512                                 '#^\s*//(.+)$#m',
 513
 514                                 // eliminate multi-line comments in '/* ... */' form, at start of string
 515                                 '#^\s*/\*(.+)\*/#Us',
 516
 517                                 // eliminate multi-line comments in '/* ... */' form, at end of string
 518                                 '#/\*(.+)\*/\s*$#Us'
 519
 520                         ), '', $str);
 521
 522                 // eliminate extraneous space
 523                 return trim($str);
 524         }
 525
 526         /**
 527          * decodes a JSON string into appropriate variable
 528          *
 529          * @param string $str JSON-formatted string
 530          *
 531          * @return mixed number, boolean, string, array, or object
 532          *                 corresponding to given JSON input string.
 533          *                 See argument 1 to Services_JSON() above for object-output behavior.
 534          *                 Note that decode() always returns strings
 535          *                 in ASCII or UTF-8 format!
 536          * @access public
 537          */
 538         function decode($str)
 539         {
 540                 $str = $this->reduce_string($str);
 541
 542                 switch (strtolower($str)) {
 543                         case 'true':
 544                                 return true;
 545
 546                         case 'false':
 547                                 return false;
 548
 549                         case 'null':
 550                                 return null;
 551
 552                         default:
 553                                 $m = array();
 554
 555                                 if (is_numeric($str)) {
 556                                         // Lookie-loo, it's a number
 557
 558                                         // This would work on its own, but I'm trying to be
 559                                         // good about returning integers where appropriate:
 560                                         // return (float)$str;
 561
 562                                         // Return float or int, as appropriate
 563                                         return ((float)$str == (integer)$str)
 564                                                 ? (integer)$str
 565                                                 : (float)$str;
 566
 567                                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
 568                                         // STRINGS RETURNED IN UTF-8 FORMAT
 569                                         $delim = substr($str, 0, 1);
 570                                         $chrs = substr($str, 1, -1);
 571                                         $utf8 = '';
 572                                         $strlen_chrs = strlen($chrs);
 573
 574                                         for ($c = 0; $c < $strlen_chrs; ++$c) {
 575
 576                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
 577                                                 $ord_chrs_c = ord($chrs{$c});
 578
 579                                                 switch (true) {
 580                                                         case $substr_chrs_c_2 == '\b':
 581                                                                 $utf8 .= chr(0x08);
 582                                                                 ++$c;
 583                                                                 break;
 584                                                         case $substr_chrs_c_2 == '\t':
 585                                                                 $utf8 .= chr(0x09);
 586                                                                 ++$c;
 587                                                                 break;
 588                                                         case $substr_chrs_c_2 == '\n':
 589                                                                 $utf8 .= chr(0x0A);
 590                                                                 ++$c;
 591                                                                 break;
 592                                                         case $substr_chrs_c_2 == '\f':
 593                                                                 $utf8 .= chr(0x0C);
 594                                                                 ++$c;
 595                                                                 break;
 596                                                         case $substr_chrs_c_2 == '\r':
 597                                                                 $utf8 .= chr(0x0D);
 598                                                                 ++$c;
 599                                                                 break;
 600
 601                                                         case $substr_chrs_c_2 == '\\"':
 602                                                         case $substr_chrs_c_2 == '\\\'':
 603                                                         case $substr_chrs_c_2 == '\\\\':
 604                                                         case $substr_chrs_c_2 == '\\/':
 605                                                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
 606                                                                    ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
 607                                                                         $utf8 .= $chrs{++$c};
 608                                                                 }
 609                                                                 break;
 610
 611                                                         case preg_match('/\\\uD[89AB][0-9A-F]{2}\\\uD[C-F][0-9A-F]{2}/i', substr($chrs, $c, 12)):
 612                                                                 // escaped unicode surrogate pair
 613                                                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
 614                                                                            . chr(hexdec(substr($chrs, ($c + 4), 2)))
 615                                                                            . chr(hexdec(substr($chrs, ($c + 8), 2)))
 616                                                                            . chr(hexdec(substr($chrs, ($c + 10), 2)));
 617                                                                 $utf8 .= $this->utf162utf8($utf16);
 618                                                                 $c += 11;
 619                                                                 break;
 620
 621                                                         case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
 622                                                                 // single, escaped unicode character
 623                                                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
 624                                                                            . chr(hexdec(substr($chrs, ($c + 4), 2)));
 625                                                                 $utf8 .= $this->utf162utf8($utf16);
 626                                                                 $c += 5;
 627                                                                 break;
 628
 629                                                         case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
 630                                                                 $utf8 .= $chrs{$c};
 631                                                                 break;
 632
 633                                                         case ($ord_chrs_c & 0xE0) == 0xC0:
 634                                                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
 635                                                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 636                                                                 $utf8 .= substr($chrs, $c, 2);
 637                                                                 ++$c;
 638                                                                 break;
 639
 640                                                         case ($ord_chrs_c & 0xF0) == 0xE0:
 641                                                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
 642                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 643                                                                 $utf8 .= substr($chrs, $c, 3);
 644                                                                 $c += 2;
 645                                                                 break;
 646
 647                                                         case ($ord_chrs_c & 0xF8) == 0xF0:
 648                                                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
 649                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 650                                                                 $utf8 .= substr($chrs, $c, 4);
 651                                                                 $c += 3;
 652                                                                 break;
 653
 654                                                         case ($ord_chrs_c & 0xFC) == 0xF8:
 655                                                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
 656                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 657                                                                 $utf8 .= substr($chrs, $c, 5);
 658                                                                 $c += 4;
 659                                                                 break;
 660
 661                                                         case ($ord_chrs_c & 0xFE) == 0xFC:
 662                                                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
 663                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 664                                                                 $utf8 .= substr($chrs, $c, 6);
 665                                                                 $c += 5;
 666                                                                 break;
 667
 668                                                 }
 669
 670                                         }
 671
 672                                         return $utf8;
 673
 674                                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
 675                                         // array, or object notation
 676
 677                                         if ($str{0} == '[') {
 678                                                 $stk = array(SERVICES_JSON_IN_ARR);
 679                                                 $arr = array();
 680                                         } else {
 681                                                 if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 682                                                         $stk = array(SERVICES_JSON_IN_OBJ);
 683                                                         $obj = array();
 684                                                 } else {
 685                                                         $stk = array(SERVICES_JSON_IN_OBJ);
 686                                                         $obj = new stdClass();
 687                                                 }
 688                                         }
 689
 690                                         array_push($stk, array( 'what'  => SERVICES_JSON_SLICE,
 691                                                                 'where' => 0,
 692                                                                 'delim' => false));
 693
 694                                         $chrs = substr($str, 1, -1);
 695                                         $chrs = $this->reduce_string($chrs);
 696
 697                                         if ($chrs == '') {
 698                                                 if (reset($stk) == SERVICES_JSON_IN_ARR) {
 699                                                         return $arr;
 700
 701                                                 } else {
 702                                                         return $obj;
 703
 704                                                 }
 705                                         }
 706
 707                                         //print("\nparsing {$chrs}\n");
 708
 709                                         $strlen_chrs = strlen($chrs);
 710
 711                                         for ($c = 0; $c <= $strlen_chrs; ++$c) {
 712
 713                                                 $top = end($stk);
 714                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
 715
 716                                                 if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
 717                                                         // found a comma that is not inside a string, array, etc.,
 718                                                         // OR we've reached the end of the character list
 719                                                         $slice = substr($chrs, $top['where'], ($c - $top['where']));
 720                                                         array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
 721                                                         //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 722
 723                                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
 724                                                                 // we are in an array, so just push an element onto the stack
 725                                                                 array_push($arr, $this->decode($slice));
 726
 727                                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
 728                                                                 // we are in an object, so figure
 729                                                                 // out the property name and set an
 730                                                                 // element in an associative array,
 731                                                                 // for now
 732                                                                 $parts = array();
 733
 734                                                                 if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
 735                                                                         // "name":value pair
 736                                                                         $key = $this->decode($parts[1]);
 737                                                                         $val = $this->decode($parts[2]);
 738
 739                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 740                                                                                 $obj[$key] = $val;
 741                                                                         } else {
 742                                                                                 $obj->$key = $val;
 743                                                                         }
 744                                                                 } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
 745                                                                         // name:value pair, where name is unquoted
 746                                                                         $key = $parts[1];
 747                                                                         $val = $this->decode($parts[2]);
 748
 749                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 750                                                                                 $obj[$key] = $val;
 751                                                                         } else {
 752                                                                                 $obj->$key = $val;
 753                                                                         }
 754                                                                 }
 755
 756                                                         }
 757
 758                                                 } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
 759                                                         // found a quote, and we are not inside a string
 760                                                         array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
 761                                                         //print("Found start of string at {$c}\n");
 762
 763                                                 } elseif (($chrs{$c} == $top['delim']) &&
 764                                                                  ($top['what'] == SERVICES_JSON_IN_STR) &&
 765                                                                  (($chrs{$c - 1} != '\\') ||
 766                                                                  ($chrs{$c - 1} == '\\' && $chrs{$c - 2} == '\\'))) {
 767                                                         // found a quote, we're in a string, and it's not escaped
 768                                                         array_pop($stk);
 769                                                         //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
 770
 771                                                 } elseif (($chrs{$c} == '[') &&
 772                                                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 773                                                         // found a left-bracket, and we are in an array, object, or slice
 774                                                         array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
 775                                                         //print("Found start of array at {$c}\n");
 776
 777                                                 } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
 778                                                         // found a right-bracket, and we're in an array
 779                                                         array_pop($stk);
 780                                                         //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 781
 782                                                 } elseif (($chrs{$c} == '{') &&
 783                                                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 784                                                         // found a left-brace, and we are in an array, object, or slice
 785                                                         array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
 786                                                         //print("Found start of object at {$c}\n");
 787
 788                                                 } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
 789                                                         // found a right-brace, and we're in an object
 790                                                         array_pop($stk);
 791                                                         //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 792
 793                                                 } elseif (($substr_chrs_c_2 == '/*') &&
 794                                                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 795                                                         // found a comment start, and we are in an array, object, or slice
 796                                                         array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
 797                                                         $c++;
 798                                                         //print("Found start of comment at {$c}\n");
 799
 800                                                 } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
 801                                                         // found a comment end, and we're in one now
 802                                                         array_pop($stk);
 803                                                         $c++;
 804
 805                                                         for ($i = $top['where']; $i <= $c; ++$i)
 806                                                                 $chrs = substr_replace($chrs, ' ', $i, 1);
 807
 808                                                         //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 809
 810                                                 }
 811
 812                                         }
 813
 814                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
 815                                                 return $arr;
 816
 817                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
 818                                                 return $obj;
 819
 820                                         }
 821
 822                                 }
 823                 }
 824         }
 825
 826         /**
 827          * @todo Ultimately, this should just call PEAR::isError()
 828          */
 829         function isError($data, $code = null)
 830         {
 831                 if ( self::pearInstalled() ) {
 832                         //avoid some strict warnings on PEAR isError check (looks like http://pear.php.net/bugs/bug.php?id=9950 has been around for some time)
 833                         return @PEAR::isError($data, $code);
 834                 } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
 835                                 is_subclass_of($data, 'services_json_error'))) {
 836                         return true;
 837                 }
 838
 839                 return false;
 840         }
 841 }
 842
 843
 844 // Hide the PEAR_Error variant from Doxygen
 845 /// @cond
 846 if (class_exists('PEAR_Error')) {
 847
 848         /**
 849          * @ingroup API
 850          */
 851         class Services_JSON_Error extends PEAR_Error
 852         {
 853                 function Services_JSON_Error($message = 'unknown error', $code = null,
 854                                                 $mode = null, $options = null, $userinfo = null)
 855                 {
 856                         parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
 857                 }
 858         }
 859
 860 } else {
 861 /// @endcond
 862
 863         /**
 864          * @todo Ultimately, this class shall be descended from PEAR_Error
 865          * @ingroup API
 866          */
 867         class Services_JSON_Error
 868         {
 869                 function Services_JSON_Error($message = 'unknown error', $code = null,
 870                                                 $mode = null, $options = null, $userinfo = null)
 871                 {
 872
 873                 }
 874         }
 875 }