Add support for displaying the year; put the album in italics. (Feature request...
[patchfork.git] / 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 ?>
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