include/lib/json.inc.php

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