inc/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  * @category
  49  * @package     Services_JSON
  50  * @author      Michal Migurski <mike-json@teczno.com>
  51  * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
  52  * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
  53  * @copyright   2005 Michal Migurski
  54  * @version     CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
  55  * @license     http://www.opensource.org/licenses/bsd-license.php
  56  * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
  57  */
  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     /* modified for pitchfork to use echo instead of recursing over all elements and returning a *large* string */
 228     /* could probably remove the conversion thing as input is utf-8 and output is utf-8 */
 229    /**
 230     * encodes an arbitrary variable into JSON format
 231     *
 232     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
 233     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
 234     *                           if var is a strng, note that encode() always expects it
 235     *                           to be in ASCII or UTF-8 format!
 236     *
 237     * @return   mixed   JSON string representation of input var or an error if a problem occurs
 238     * @access   public
 239     */
 240     function encode($var)
 241     {
 242         switch (gettype($var)) {
 243             case 'boolean':
 244                 echo $var ? 'true' : 'false';
 245                 return;
 246
 247             case 'NULL':
 248                 echo 'null';
 249                 return;
 250
 251             case 'integer':
 252                 echo (int) $var;
 253                 return;
 254
 255             case 'double':
 256             case 'float':
 257                 echo (float) $var;
 258                 return;
 259
 260             case 'string':
 261                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
 262                 $ascii = '';
 263                 $strlen_var = strlen($var);
 264
 265                /*
 266                 * Iterate over every character in the string,
 267                 * escaping with a slash or encoding to UTF-8 where necessary
 268                 */
 269                 for ($c = 0; $c < $strlen_var; ++$c) {
 270
 271                     $ord_var_c = ord($var{$c});
 272
 273                     switch (true) {
 274                         case $ord_var_c == 0x08:
 275                             $ascii .= '\b';
 276                             break;
 277                         case $ord_var_c == 0x09:
 278                             $ascii .= '\t';
 279                             break;
 280                         case $ord_var_c == 0x0A:
 281                             $ascii .= '\n';
 282                             break;
 283                         case $ord_var_c == 0x0C:
 284                             $ascii .= '\f';
 285                             break;
 286                         case $ord_var_c == 0x0D:
 287                             $ascii .= '\r';
 288                             break;
 289
 290                         case $ord_var_c == 0x22:
 291                         case $ord_var_c == 0x2F:
 292                         case $ord_var_c == 0x5C:
 293                             // double quote, slash, slosh
 294                             $ascii .= '\\'.$var{$c};
 295                             break;
 296
 297                         case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
 298                             // characters U-00000000 - U-0000007F (same as ASCII)
 299                             $ascii .= $var{$c};
 300                             break;
 301
 302                         case (($ord_var_c & 0xE0) == 0xC0):
 303                             // characters U-00000080 - U-000007FF, mask 110XXXXX
 304                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 305                             $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
 306                             $c += 1;
 307                             $utf16 = $this->utf82utf16($char);
 308                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
 309                             break;
 310
 311                         case (($ord_var_c & 0xF0) == 0xE0):
 312                             // characters U-00000800 - U-0000FFFF, mask 1110XXXX
 313                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 314                             $char = pack('C*', $ord_var_c,
 315                                          ord($var{$c + 1}),
 316                                          ord($var{$c + 2}));
 317                             $c += 2;
 318                             $utf16 = $this->utf82utf16($char);
 319                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
 320                             break;
 321
 322                         case (($ord_var_c & 0xF8) == 0xF0):
 323                             // characters U-00010000 - U-001FFFFF, mask 11110XXX
 324                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 325                             $char = pack('C*', $ord_var_c,
 326                                          ord($var{$c + 1}),
 327                                          ord($var{$c + 2}),
 328                                          ord($var{$c + 3}));
 329                             $c += 3;
 330                             $utf16 = $this->utf82utf16($char);
 331                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
 332                             break;
 333
 334                         case (($ord_var_c & 0xFC) == 0xF8):
 335                             // characters U-00200000 - U-03FFFFFF, mask 111110XX
 336                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 337                             $char = pack('C*', $ord_var_c,
 338                                          ord($var{$c + 1}),
 339                                          ord($var{$c + 2}),
 340                                          ord($var{$c + 3}),
 341                                          ord($var{$c + 4}));
 342                             $c += 4;
 343                             $utf16 = $this->utf82utf16($char);
 344                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
 345                             break;
 346
 347                         case (($ord_var_c & 0xFE) == 0xFC):
 348                             // characters U-04000000 - U-7FFFFFFF, mask 1111110X
 349                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 350                             $char = pack('C*', $ord_var_c,
 351                                          ord($var{$c + 1}),
 352                                          ord($var{$c + 2}),
 353                                          ord($var{$c + 3}),
 354                                          ord($var{$c + 4}),
 355                                          ord($var{$c + 5}));
 356                             $c += 5;
 357                             $utf16 = $this->utf82utf16($char);
 358                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
 359                             break;
 360                     }
 361                 }
 362
 363                 echo '"'.$ascii.'"';
 364                 return;
 365
 366             case 'array':
 367                /*
 368                 * As per JSON spec if any array key is not an integer
 369                 * we must treat the the whole array as an object. We
 370                 * also try to catch a sparsely populated associative
 371                 * array with numeric keys here because some JS engines
 372                 * will create an array with empty indexes up to
 373                 * max_index which can cause memory issues and because
 374                 * the keys, which may be relevant, will be remapped
 375                 * otherwise.
 376                 *
 377                 * As per the ECMA and JSON specification an object may
 378                 * have any string as a property. Unfortunately due to
 379                 * a hole in the ECMA specification if the key is a
 380                 * ECMA reserved word or starts with a digit the
 381                 * parameter is only accessible using ECMAScript's
 382                 * bracket notation.
 383                 */
 384
 385                 // treat as a JSON object
 386                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
 387                     echo "{";
 388                     $first = true;
 389                     foreach($var as $k => $v) {
 390                         if($first) $first = false;
 391                         else echo ",";
 392                         $this->name_value($k, $v);
 393                     }
 394
 395                     echo '}';
 396                     return;
 397                 }
 398
 399                 // treat it like a regular array
 400                 echo "[";
 401                 $first = true;
 402                 foreach($var as $e) {
 403                     if($first) $first = false;
 404                     else echo ",";
 405                     $this->encode($e);
 406                 }
 407                 echo "]";
 408                 return;
 409
 410             case 'object':
 411                 echo "{";
 412                 $first = true;
 413                 foreach($var as $k => $v) {
 414                     if($first)
 415                         $first = false;
 416                     else echo ",";
 417                     $this->name_value($k, $v);
 418                 }
 419
 420                 echo '}';
 421                 return;
 422
 423             default:
 424                 echo ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
 425                     ? 'null'
 426                     : 'error encoding';
 427                 return;
 428         }
 429     }
 430
 431    /**
 432     * array-walking function for use in generating JSON-formatted name-value pairs
 433     *
 434     * @param    string  $name   name of key to use
 435     * @param    mixed   $value  reference to an array element to be encoded
 436     *
 437     * @return   string  JSON-formatted name-value pair, like '"name":value'
 438     * @access   private
 439     */
 440     function name_value($name, $value)
 441     {
 442         $this->encode(strval($name));
 443         echo ':';
 444         $this->encode($value);
 445     }
 446
 447    /**
 448     * reduce a string by removing leading and trailing comments and whitespace
 449     *
 450     * @param    $str    string      string value to strip of comments and whitespace
 451     *
 452     * @return   string  string value stripped of comments and whitespace
 453     * @access   private
 454     */
 455     function reduce_string($str)
 456     {
 457         $str = preg_replace(array(
 458
 459                 // eliminate single line comments in '// ...' form
 460                 '#^\s*//(.+)$#m',
 461
 462                 // eliminate multi-line comments in '/* ... */' form, at start of string
 463                 '#^\s*/\*(.+)\*/#Us',
 464
 465                 // eliminate multi-line comments in '/* ... */' form, at end of string
 466                 '#/\*(.+)\*/\s*$#Us'
 467
 468             ), '', $str);
 469
 470         // eliminate extraneous space
 471         return trim($str);
 472     }
 473
 474    /**
 475     * decodes a JSON string into appropriate variable
 476     *
 477     * @param    string  $str    JSON-formatted string
 478     *
 479     * @return   mixed   number, boolean, string, array, or object
 480     *                   corresponding to given JSON input string.
 481     *                   See argument 1 to Services_JSON() above for object-output behavior.
 482     *                   Note that decode() always returns strings
 483     *                   in ASCII or UTF-8 format!
 484     * @access   public
 485     */
 486     function decode($str)
 487     {
 488         $str = $this->reduce_string($str);
 489
 490         switch (strtolower($str)) {
 491             case 'true':
 492                 return true;
 493
 494             case 'false':
 495                 return false;
 496
 497             case 'null':
 498                 return null;
 499
 500             default:
 501                 $m = array();
 502
 503                 if (is_numeric($str)) {
 504                     // Lookie-loo, it's a number
 505
 506                     // This would work on its own, but I'm trying to be
 507                     // good about returning integers where appropriate:
 508                     // return (float)$str;
 509
 510                     // Return float or int, as appropriate
 511                     return ((float)$str == (integer)$str)
 512                         ? (integer)$str
 513                         : (float)$str;
 514
 515                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
 516                     // STRINGS RETURNED IN UTF-8 FORMAT
 517                     $delim = substr($str, 0, 1);
 518                     $chrs = substr($str, 1, -1);
 519                     $utf8 = '';
 520                     $strlen_chrs = strlen($chrs);
 521
 522                     for ($c = 0; $c < $strlen_chrs; ++$c) {
 523
 524                         $substr_chrs_c_2 = substr($chrs, $c, 2);
 525                         $ord_chrs_c = ord($chrs{$c});
 526
 527                         switch (true) {
 528                             case $substr_chrs_c_2 == '\b':
 529                                 $utf8 .= chr(0x08);
 530                                 ++$c;
 531                                 break;
 532                             case $substr_chrs_c_2 == '\t':
 533                                 $utf8 .= chr(0x09);
 534                                 ++$c;
 535                                 break;
 536                             case $substr_chrs_c_2 == '\n':
 537                                 $utf8 .= chr(0x0A);
 538                                 ++$c;
 539                                 break;
 540                             case $substr_chrs_c_2 == '\f':
 541                                 $utf8 .= chr(0x0C);
 542                                 ++$c;
 543                                 break;
 544                             case $substr_chrs_c_2 == '\r':
 545                                 $utf8 .= chr(0x0D);
 546                                 ++$c;
 547                                 break;
 548
 549                             case $substr_chrs_c_2 == '\\"':
 550                             case $substr_chrs_c_2 == '\\\'':
 551                             case $substr_chrs_c_2 == '\\\\':
 552                             case $substr_chrs_c_2 == '\\/':
 553                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
 554                                    ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
 555                                     $utf8 .= $chrs{++$c};
 556                                 }
 557                                 break;
 558
 559                             case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
 560                                 // single, escaped unicode character
 561                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
 562                                        . chr(hexdec(substr($chrs, ($c + 4), 2)));
 563                                 $utf8 .= $this->utf162utf8($utf16);
 564                                 $c += 5;
 565                                 break;
 566
 567                             case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
 568                                 $utf8 .= $chrs{$c};
 569                                 break;
 570
 571                             case ($ord_chrs_c & 0xE0) == 0xC0:
 572                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
 573                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 574                                 $utf8 .= substr($chrs, $c, 2);
 575                                 ++$c;
 576                                 break;
 577
 578                             case ($ord_chrs_c & 0xF0) == 0xE0:
 579                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
 580                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 581                                 $utf8 .= substr($chrs, $c, 3);
 582                                 $c += 2;
 583                                 break;
 584
 585                             case ($ord_chrs_c & 0xF8) == 0xF0:
 586                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
 587                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 588                                 $utf8 .= substr($chrs, $c, 4);
 589                                 $c += 3;
 590                                 break;
 591
 592                             case ($ord_chrs_c & 0xFC) == 0xF8:
 593                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
 594                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 595                                 $utf8 .= substr($chrs, $c, 5);
 596                                 $c += 4;
 597                                 break;
 598
 599                             case ($ord_chrs_c & 0xFE) == 0xFC:
 600                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
 601                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 602                                 $utf8 .= substr($chrs, $c, 6);
 603                                 $c += 5;
 604                                 break;
 605
 606                         }
 607
 608                     }
 609
 610                     return $utf8;
 611
 612                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
 613                     // array, or object notation
 614
 615                     if ($str{0} == '[') {
 616                         $stk = array(SERVICES_JSON_IN_ARR);
 617                         $arr = array();
 618                     } else {
 619                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 620                             $stk = array(SERVICES_JSON_IN_OBJ);
 621                             $obj = array();
 622                         } else {
 623                             $stk = array(SERVICES_JSON_IN_OBJ);
 624                             $obj = new stdClass();
 625                         }
 626                     }
 627
 628                     array_push($stk, array('what'  => SERVICES_JSON_SLICE,
 629                                            'where' => 0,
 630                                            'delim' => false));
 631
 632                     $chrs = substr($str, 1, -1);
 633                     $chrs = $this->reduce_string($chrs);
 634
 635                     if ($chrs == '') {
 636                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
 637                             return $arr;
 638
 639                         } else {
 640                             return $obj;
 641
 642                         }
 643                     }
 644
 645                     //print("\nparsing {$chrs}\n");
 646
 647                     $strlen_chrs = strlen($chrs);
 648
 649                     for ($c = 0; $c <= $strlen_chrs; ++$c) {
 650
 651                         $top = end($stk);
 652                         $substr_chrs_c_2 = substr($chrs, $c, 2);
 653
 654                         if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
 655                             // found a comma that is not inside a string, array, etc.,
 656                             // OR we've reached the end of the character list
 657                             $slice = substr($chrs, $top['where'], ($c - $top['where']));
 658                             array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
 659                             //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 660
 661                             if (reset($stk) == SERVICES_JSON_IN_ARR) {
 662                                 // we are in an array, so just push an element onto the stack
 663                                 array_push($arr, $this->decode($slice));
 664
 665                             } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
 666                                 // we are in an object, so figure
 667                                 // out the property name and set an
 668                                 // element in an associative array,
 669                                 // for now
 670                                 $parts = array();
 671
 672                                 if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
 673                                     // "name":value pair
 674                                     $key = $this->decode($parts[1]);
 675                                     $val = $this->decode($parts[2]);
 676
 677                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 678                                         $obj[$key] = $val;
 679                                     } else {
 680                                         $obj->$key = $val;
 681                                     }
 682                                 } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
 683                                     // name:value pair, where name is unquoted
 684                                     $key = $parts[1];
 685                                     $val = $this->decode($parts[2]);
 686
 687                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
 688                                         $obj[$key] = $val;
 689                                     } else {
 690                                         $obj->$key = $val;
 691                                     }
 692                                 }
 693
 694                             }
 695
 696                         } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
 697                             // found a quote, and we are not inside a string
 698                             array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
 699                             //print("Found start of string at {$c}\n");
 700
 701                         } elseif (($chrs{$c} == $top['delim']) &&
 702                                  ($top['what'] == SERVICES_JSON_IN_STR) &&
 703                                  ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
 704                             // found a quote, we're in a string, and it's not escaped
 705                             // we know that it's not escaped becase there is _not_ an
 706                             // odd number of backslashes at the end of the string so far
 707                             array_pop($stk);
 708                             //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
 709
 710                         } elseif (($chrs{$c} == '[') &&
 711                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 712                             // found a left-bracket, and we are in an array, object, or slice
 713                             array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
 714                             //print("Found start of array at {$c}\n");
 715
 716                         } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
 717                             // found a right-bracket, and we're in an array
 718                             array_pop($stk);
 719                             //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 720
 721                         } elseif (($chrs{$c} == '{') &&
 722                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 723                             // found a left-brace, and we are in an array, object, or slice
 724                             array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
 725                             //print("Found start of object at {$c}\n");
 726
 727                         } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
 728                             // found a right-brace, and we're in an object
 729                             array_pop($stk);
 730                             //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 731
 732                         } elseif (($substr_chrs_c_2 == '/*') &&
 733                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
 734                             // found a comment start, and we are in an array, object, or slice
 735                             array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
 736                             $c++;
 737                             //print("Found start of comment at {$c}\n");
 738
 739                         } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
 740                             // found a comment end, and we're in one now
 741                             array_pop($stk);
 742                             $c++;
 743
 744                             for ($i = $top['where']; $i <= $c; ++$i)
 745                                 $chrs = substr_replace($chrs, ' ', $i, 1);
 746
 747                             //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
 748
 749                         }
 750
 751                     }
 752
 753                     if (reset($stk) == SERVICES_JSON_IN_ARR) {
 754                         return $arr;
 755
 756                     } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
 757                         return $obj;
 758
 759                     }
 760
 761                 }
 762         }
 763     }
 764
 765     /**
 766      * @todo Ultimately, this should just call PEAR::isError()
 767      */
 768     function isError($data, $code = null)
 769     {
 770         if (class_exists('pear')) {
 771             return PEAR::isError($data, $code);
 772         } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
 773                                  is_subclass_of($data, 'services_json_error'))) {
 774             return true;
 775         }
 776
 777         return false;
 778     }
 779 }
 780
 781 if (class_exists('PEAR_Error')) {
 782
 783     class Services_JSON_Error extends PEAR_Error
 784     {
 785         function Services_JSON_Error($message = 'unknown error', $code = null,
 786                                      $mode = null, $options = null, $userinfo = null)
 787         {
 788             parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
 789         }
 790     }
 791
 792 } else {
 793
 794     /**
 795      * @todo Ultimately, this class shall be descended from PEAR_Error
 796      */
 797     class Services_JSON_Error
 798     {
 799         function Services_JSON_Error($message = 'unknown error', $code = null,
 800                                      $mode = null, $options = null, $userinfo = null)
 801         {
 802
 803         }
 804     }
 805
 806 }
 807
 808 ?>