Another attempt to fix the http blog redirects.
[WebKit-https.git] / Websites / webkit.org / blog / wp-includes / class-json.php
1 <?php
2 if ( ! class_exists( 'Services_JSON' ) ) :
3 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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 305040 2010-11-02 23:19:03Z alan_k $
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  * Behavior switch for Services_JSON::decode()
96  */
97 define('SERVICES_JSON_USE_TO_JSON', 64);
98
99 /**
100  * Converts to and from JSON format.
101  *
102  * Brief example of use:
103  *
104  * <code>
105  * // create a new instance of Services_JSON
106  * $json = new Services_JSON();
107  *
108  * // convert a complexe value to JSON notation, and send it to the browser
109  * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
110  * $output = $json->encode($value);
111  *
112  * print($output);
113  * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
114  *
115  * // accept incoming POST data, assumed to be in JSON notation
116  * $input = file_get_contents('php://input', 1000000);
117  * $value = $json->decode($input);
118  * </code>
119  */
120 class Services_JSON
121 {
122    /**
123     * constructs a new JSON instance
124     *
125     * @param    int     $use    object behavior flags; combine with boolean-OR
126     *
127     *                           possible values:
128     *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
129     *                                   "{...}" syntax creates associative arrays
130     *                                   instead of objects in decode().
131     *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
132     *                                   Values which can't be encoded (e.g. resources)
133     *                                   appear as NULL instead of throwing errors.
134     *                                   By default, a deeply-nested resource will
135     *                                   bubble up with an error, so all return values
136     *                                   from encode() should be checked with isError()
137     *                           - SERVICES_JSON_USE_TO_JSON:  call toJSON when serializing objects
138     *                                   It serializes the return value from the toJSON call rather 
139     *                                   than the object it'self,  toJSON can return associative arrays, 
140     *                                   strings or numbers, if you return an object, make sure it does
141     *                                   not have a toJSON method, otherwise an error will occur.
142     */
143     function Services_JSON($use = 0)
144     {
145         $this->use = $use;
146         $this->_mb_strlen            = function_exists('mb_strlen');
147         $this->_mb_convert_encoding  = function_exists('mb_convert_encoding');
148         $this->_mb_substr            = function_exists('mb_substr');
149     }
150     // private - cache the mbstring lookup results..
151     var $_mb_strlen = false;
152     var $_mb_substr = false;
153     var $_mb_convert_encoding = false;
154     
155    /**
156     * convert a string from one UTF-16 char to one UTF-8 char
157     *
158     * Normally should be handled by mb_convert_encoding, but
159     * provides a slower PHP-only method for installations
160     * that lack the multibye string extension.
161     *
162     * @param    string  $utf16  UTF-16 character
163     * @return   string  UTF-8 character
164     * @access   private
165     */
166     function utf162utf8($utf16)
167     {
168         // oh please oh please oh please oh please oh please
169         if($this->_mb_convert_encoding) {
170             return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
171         }
172
173         $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
174
175         switch(true) {
176             case ((0x7F & $bytes) == $bytes):
177                 // this case should never be reached, because we are in ASCII range
178                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
179                 return chr(0x7F & $bytes);
180
181             case (0x07FF & $bytes) == $bytes:
182                 // return a 2-byte UTF-8 character
183                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
184                 return chr(0xC0 | (($bytes >> 6) & 0x1F))
185                      . chr(0x80 | ($bytes & 0x3F));
186
187             case (0xFFFF & $bytes) == $bytes:
188                 // return a 3-byte UTF-8 character
189                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
190                 return chr(0xE0 | (($bytes >> 12) & 0x0F))
191                      . chr(0x80 | (($bytes >> 6) & 0x3F))
192                      . chr(0x80 | ($bytes & 0x3F));
193         }
194
195         // ignoring UTF-32 for now, sorry
196         return '';
197     }
198
199    /**
200     * convert a string from one UTF-8 char to one UTF-16 char
201     *
202     * Normally should be handled by mb_convert_encoding, but
203     * provides a slower PHP-only method for installations
204     * that lack the multibye string extension.
205     *
206     * @param    string  $utf8   UTF-8 character
207     * @return   string  UTF-16 character
208     * @access   private
209     */
210     function utf82utf16($utf8)
211     {
212         // oh please oh please oh please oh please oh please
213         if($this->_mb_convert_encoding) {
214             return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
215         }
216
217         switch($this->strlen8($utf8)) {
218             case 1:
219                 // this case should never be reached, because we are in ASCII range
220                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
221                 return $utf8;
222
223             case 2:
224                 // return a UTF-16 character from a 2-byte UTF-8 char
225                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
226                 return chr(0x07 & (ord($utf8{0}) >> 2))
227                      . chr((0xC0 & (ord($utf8{0}) << 6))
228                          | (0x3F & ord($utf8{1})));
229
230             case 3:
231                 // return a UTF-16 character from a 3-byte UTF-8 char
232                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
233                 return chr((0xF0 & (ord($utf8{0}) << 4))
234                          | (0x0F & (ord($utf8{1}) >> 2)))
235                      . chr((0xC0 & (ord($utf8{1}) << 6))
236                          | (0x7F & ord($utf8{2})));
237         }
238
239         // ignoring UTF-32 for now, sorry
240         return '';
241     }
242
243    /**
244     * encodes an arbitrary variable into JSON format (and sends JSON Header)
245     *
246     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
247     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
248     *                           if var is a strng, note that encode() always expects it
249     *                           to be in ASCII or UTF-8 format!
250     *
251     * @return   mixed   JSON string representation of input var or an error if a problem occurs
252     * @access   public
253     */
254     function encode($var)
255     {
256         header('Content-type: application/json');
257         return $this->encodeUnsafe($var);
258     }
259     /**
260     * encodes an arbitrary variable into JSON format without JSON Header - warning - may allow XSS!!!!)
261     *
262     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
263     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
264     *                           if var is a strng, note that encode() always expects it
265     *                           to be in ASCII or UTF-8 format!
266     *
267     * @return   mixed   JSON string representation of input var or an error if a problem occurs
268     * @access   public
269     */
270     function encodeUnsafe($var)
271     {
272         // see bug #16908 - regarding numeric locale printing
273         $lc = setlocale(LC_NUMERIC, 0);
274         setlocale(LC_NUMERIC, 'C');
275         $ret = $this->_encode($var);
276         setlocale(LC_NUMERIC, $lc);
277         return $ret;
278         
279     }
280     /**
281     * PRIVATE CODE that does the work of encodes an arbitrary variable into JSON format 
282     *
283     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
284     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
285     *                           if var is a strng, note that encode() always expects it
286     *                           to be in ASCII or UTF-8 format!
287     *
288     * @return   mixed   JSON string representation of input var or an error if a problem occurs
289     * @access   public
290     */
291     function _encode($var) 
292     {
293          
294         switch (gettype($var)) {
295             case 'boolean':
296                 return $var ? 'true' : 'false';
297
298             case 'NULL':
299                 return 'null';
300
301             case 'integer':
302                 return (int) $var;
303
304             case 'double':
305             case 'float':
306                 return  (float) $var;
307
308             case 'string':
309                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
310                 $ascii = '';
311                 $strlen_var = $this->strlen8($var);
312
313                /*
314                 * Iterate over every character in the string,
315                 * escaping with a slash or encoding to UTF-8 where necessary
316                 */
317                 for ($c = 0; $c < $strlen_var; ++$c) {
318
319                     $ord_var_c = ord($var{$c});
320
321                     switch (true) {
322                         case $ord_var_c == 0x08:
323                             $ascii .= '\b';
324                             break;
325                         case $ord_var_c == 0x09:
326                             $ascii .= '\t';
327                             break;
328                         case $ord_var_c == 0x0A:
329                             $ascii .= '\n';
330                             break;
331                         case $ord_var_c == 0x0C:
332                             $ascii .= '\f';
333                             break;
334                         case $ord_var_c == 0x0D:
335                             $ascii .= '\r';
336                             break;
337
338                         case $ord_var_c == 0x22:
339                         case $ord_var_c == 0x2F:
340                         case $ord_var_c == 0x5C:
341                             // double quote, slash, slosh
342                             $ascii .= '\\'.$var{$c};
343                             break;
344
345                         case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
346                             // characters U-00000000 - U-0000007F (same as ASCII)
347                             $ascii .= $var{$c};
348                             break;
349
350                         case (($ord_var_c & 0xE0) == 0xC0):
351                             // characters U-00000080 - U-000007FF, mask 110XXXXX
352                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
353                             if ($c+1 >= $strlen_var) {
354                                 $c += 1;
355                                 $ascii .= '?';
356                                 break;
357                             }
358                             
359                             $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
360                             $c += 1;
361                             $utf16 = $this->utf82utf16($char);
362                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
363                             break;
364
365                         case (($ord_var_c & 0xF0) == 0xE0):
366                             if ($c+2 >= $strlen_var) {
367                                 $c += 2;
368                                 $ascii .= '?';
369                                 break;
370                             }
371                             // characters U-00000800 - U-0000FFFF, mask 1110XXXX
372                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
373                             $char = pack('C*', $ord_var_c,
374                                          @ord($var{$c + 1}),
375                                          @ord($var{$c + 2}));
376                             $c += 2;
377                             $utf16 = $this->utf82utf16($char);
378                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
379                             break;
380
381                         case (($ord_var_c & 0xF8) == 0xF0):
382                             if ($c+3 >= $strlen_var) {
383                                 $c += 3;
384                                 $ascii .= '?';
385                                 break;
386                             }
387                             // characters U-00010000 - U-001FFFFF, mask 11110XXX
388                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
389                             $char = pack('C*', $ord_var_c,
390                                          ord($var{$c + 1}),
391                                          ord($var{$c + 2}),
392                                          ord($var{$c + 3}));
393                             $c += 3;
394                             $utf16 = $this->utf82utf16($char);
395                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
396                             break;
397
398                         case (($ord_var_c & 0xFC) == 0xF8):
399                             // characters U-00200000 - U-03FFFFFF, mask 111110XX
400                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
401                             if ($c+4 >= $strlen_var) {
402                                 $c += 4;
403                                 $ascii .= '?';
404                                 break;
405                             }
406                             $char = pack('C*', $ord_var_c,
407                                          ord($var{$c + 1}),
408                                          ord($var{$c + 2}),
409                                          ord($var{$c + 3}),
410                                          ord($var{$c + 4}));
411                             $c += 4;
412                             $utf16 = $this->utf82utf16($char);
413                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
414                             break;
415
416                         case (($ord_var_c & 0xFE) == 0xFC):
417                         if ($c+5 >= $strlen_var) {
418                                 $c += 5;
419                                 $ascii .= '?';
420                                 break;
421                             }
422                             // characters U-04000000 - U-7FFFFFFF, mask 1111110X
423                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
424                             $char = pack('C*', $ord_var_c,
425                                          ord($var{$c + 1}),
426                                          ord($var{$c + 2}),
427                                          ord($var{$c + 3}),
428                                          ord($var{$c + 4}),
429                                          ord($var{$c + 5}));
430                             $c += 5;
431                             $utf16 = $this->utf82utf16($char);
432                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
433                             break;
434                     }
435                 }
436                 return  '"'.$ascii.'"';
437
438             case 'array':
439                /*
440                 * As per JSON spec if any array key is not an integer
441                 * we must treat the the whole array as an object. We
442                 * also try to catch a sparsely populated associative
443                 * array with numeric keys here because some JS engines
444                 * will create an array with empty indexes up to
445                 * max_index which can cause memory issues and because
446                 * the keys, which may be relevant, will be remapped
447                 * otherwise.
448                 *
449                 * As per the ECMA and JSON specification an object may
450                 * have any string as a property. Unfortunately due to
451                 * a hole in the ECMA specification if the key is a
452                 * ECMA reserved word or starts with a digit the
453                 * parameter is only accessible using ECMAScript's
454                 * bracket notation.
455                 */
456
457                 // treat as a JSON object
458                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
459                     $properties = array_map(array($this, 'name_value'),
460                                             array_keys($var),
461                                             array_values($var));
462
463                     foreach($properties as $property) {
464                         if(Services_JSON::isError($property)) {
465                             return $property;
466                         }
467                     }
468
469                     return '{' . join(',', $properties) . '}';
470                 }
471
472                 // treat it like a regular array
473                 $elements = array_map(array($this, '_encode'), $var);
474
475                 foreach($elements as $element) {
476                     if(Services_JSON::isError($element)) {
477                         return $element;
478                     }
479                 }
480
481                 return '[' . join(',', $elements) . ']';
482
483             case 'object':
484             
485                 // support toJSON methods.
486                 if (($this->use & SERVICES_JSON_USE_TO_JSON) && method_exists($var, 'toJSON')) {
487                     // this may end up allowing unlimited recursion
488                     // so we check the return value to make sure it's not got the same method.
489                     $recode = $var->toJSON();
490                     
491                     if (method_exists($recode, 'toJSON')) {
492                         
493                         return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
494                         ? 'null'
495                         : new Services_JSON_Error(get_class($var).
496                             " toJSON returned an object with a toJSON method.");
497                             
498                     }
499                     
500                     return $this->_encode( $recode );
501                 } 
502                 
503                 $vars = get_object_vars($var);
504                 
505                 $properties = array_map(array($this, 'name_value'),
506                                         array_keys($vars),
507                                         array_values($vars));
508
509                 foreach($properties as $property) {
510                     if(Services_JSON::isError($property)) {
511                         return $property;
512                     }
513                 }
514
515                 return '{' . join(',', $properties) . '}';
516
517             default:
518                 return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
519                     ? 'null'
520                     : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
521         }
522     }
523
524    /**
525     * array-walking function for use in generating JSON-formatted name-value pairs
526     *
527     * @param    string  $name   name of key to use
528     * @param    mixed   $value  reference to an array element to be encoded
529     *
530     * @return   string  JSON-formatted name-value pair, like '"name":value'
531     * @access   private
532     */
533     function name_value($name, $value)
534     {
535         $encoded_value = $this->_encode($value);
536
537         if(Services_JSON::isError($encoded_value)) {
538             return $encoded_value;
539         }
540
541         return $this->_encode(strval($name)) . ':' . $encoded_value;
542     }
543
544    /**
545     * reduce a string by removing leading and trailing comments and whitespace
546     *
547     * @param    $str    string      string value to strip of comments and whitespace
548     *
549     * @return   string  string value stripped of comments and whitespace
550     * @access   private
551     */
552     function reduce_string($str)
553     {
554         $str = preg_replace(array(
555
556                 // eliminate single line comments in '// ...' form
557                 '#^\s*//(.+)$#m',
558
559                 // eliminate multi-line comments in '/* ... */' form, at start of string
560                 '#^\s*/\*(.+)\*/#Us',
561
562                 // eliminate multi-line comments in '/* ... */' form, at end of string
563                 '#/\*(.+)\*/\s*$#Us'
564
565             ), '', $str);
566
567         // eliminate extraneous space
568         return trim($str);
569     }
570
571    /**
572     * decodes a JSON string into appropriate variable
573     *
574     * @param    string  $str    JSON-formatted string
575     *
576     * @return   mixed   number, boolean, string, array, or object
577     *                   corresponding to given JSON input string.
578     *                   See argument 1 to Services_JSON() above for object-output behavior.
579     *                   Note that decode() always returns strings
580     *                   in ASCII or UTF-8 format!
581     * @access   public
582     */
583     function decode($str)
584     {
585         $str = $this->reduce_string($str);
586
587         switch (strtolower($str)) {
588             case 'true':
589                 return true;
590
591             case 'false':
592                 return false;
593
594             case 'null':
595                 return null;
596
597             default:
598                 $m = array();
599
600                 if (is_numeric($str)) {
601                     // Lookie-loo, it's a number
602
603                     // This would work on its own, but I'm trying to be
604                     // good about returning integers where appropriate:
605                     // return (float)$str;
606
607                     // Return float or int, as appropriate
608                     return ((float)$str == (integer)$str)
609                         ? (integer)$str
610                         : (float)$str;
611
612                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
613                     // STRINGS RETURNED IN UTF-8 FORMAT
614                     $delim = $this->substr8($str, 0, 1);
615                     $chrs = $this->substr8($str, 1, -1);
616                     $utf8 = '';
617                     $strlen_chrs = $this->strlen8($chrs);
618
619                     for ($c = 0; $c < $strlen_chrs; ++$c) {
620
621                         $substr_chrs_c_2 = $this->substr8($chrs, $c, 2);
622                         $ord_chrs_c = ord($chrs{$c});
623
624                         switch (true) {
625                             case $substr_chrs_c_2 == '\b':
626                                 $utf8 .= chr(0x08);
627                                 ++$c;
628                                 break;
629                             case $substr_chrs_c_2 == '\t':
630                                 $utf8 .= chr(0x09);
631                                 ++$c;
632                                 break;
633                             case $substr_chrs_c_2 == '\n':
634                                 $utf8 .= chr(0x0A);
635                                 ++$c;
636                                 break;
637                             case $substr_chrs_c_2 == '\f':
638                                 $utf8 .= chr(0x0C);
639                                 ++$c;
640                                 break;
641                             case $substr_chrs_c_2 == '\r':
642                                 $utf8 .= chr(0x0D);
643                                 ++$c;
644                                 break;
645
646                             case $substr_chrs_c_2 == '\\"':
647                             case $substr_chrs_c_2 == '\\\'':
648                             case $substr_chrs_c_2 == '\\\\':
649                             case $substr_chrs_c_2 == '\\/':
650                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
651                                    ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
652                                     $utf8 .= $chrs{++$c};
653                                 }
654                                 break;
655
656                             case preg_match('/\\\u[0-9A-F]{4}/i', $this->substr8($chrs, $c, 6)):
657                                 // single, escaped unicode character
658                                 $utf16 = chr(hexdec($this->substr8($chrs, ($c + 2), 2)))
659                                        . chr(hexdec($this->substr8($chrs, ($c + 4), 2)));
660                                 $utf8 .= $this->utf162utf8($utf16);
661                                 $c += 5;
662                                 break;
663
664                             case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
665                                 $utf8 .= $chrs{$c};
666                                 break;
667
668                             case ($ord_chrs_c & 0xE0) == 0xC0:
669                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
670                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
671                                 $utf8 .= $this->substr8($chrs, $c, 2);
672                                 ++$c;
673                                 break;
674
675                             case ($ord_chrs_c & 0xF0) == 0xE0:
676                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
677                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
678                                 $utf8 .= $this->substr8($chrs, $c, 3);
679                                 $c += 2;
680                                 break;
681
682                             case ($ord_chrs_c & 0xF8) == 0xF0:
683                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
684                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
685                                 $utf8 .= $this->substr8($chrs, $c, 4);
686                                 $c += 3;
687                                 break;
688
689                             case ($ord_chrs_c & 0xFC) == 0xF8:
690                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
691                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
692                                 $utf8 .= $this->substr8($chrs, $c, 5);
693                                 $c += 4;
694                                 break;
695
696                             case ($ord_chrs_c & 0xFE) == 0xFC:
697                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
698                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
699                                 $utf8 .= $this->substr8($chrs, $c, 6);
700                                 $c += 5;
701                                 break;
702
703                         }
704
705                     }
706
707                     return $utf8;
708
709                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
710                     // array, or object notation
711
712                     if ($str{0} == '[') {
713                         $stk = array(SERVICES_JSON_IN_ARR);
714                         $arr = array();
715                     } else {
716                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
717                             $stk = array(SERVICES_JSON_IN_OBJ);
718                             $obj = array();
719                         } else {
720                             $stk = array(SERVICES_JSON_IN_OBJ);
721                             $obj = new stdClass();
722                         }
723                     }
724
725                     array_push($stk, array('what'  => SERVICES_JSON_SLICE,
726                                            'where' => 0,
727                                            'delim' => false));
728
729                     $chrs = $this->substr8($str, 1, -1);
730                     $chrs = $this->reduce_string($chrs);
731
732                     if ($chrs == '') {
733                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
734                             return $arr;
735
736                         } else {
737                             return $obj;
738
739                         }
740                     }
741
742                     //print("\nparsing {$chrs}\n");
743
744                     $strlen_chrs = $this->strlen8($chrs);
745
746                     for ($c = 0; $c <= $strlen_chrs; ++$c) {
747
748                         $top = end($stk);
749                         $substr_chrs_c_2 = $this->substr8($chrs, $c, 2);
750
751                         if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
752                             // found a comma that is not inside a string, array, etc.,
753                             // OR we've reached the end of the character list
754                             $slice = $this->substr8($chrs, $top['where'], ($c - $top['where']));
755                             array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
756                             //print("Found split at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
757
758                             if (reset($stk) == SERVICES_JSON_IN_ARR) {
759                                 // we are in an array, so just push an element onto the stack
760                                 array_push($arr, $this->decode($slice));
761
762                             } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
763                                 // we are in an object, so figure
764                                 // out the property name and set an
765                                 // element in an associative array,
766                                 // for now
767                                 $parts = array();
768                                 
769                                if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:/Uis', $slice, $parts)) {
770                                       // "name":value pair
771                                     $key = $this->decode($parts[1]);
772                                     $val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));
773                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
774                                         $obj[$key] = $val;
775                                     } else {
776                                         $obj->$key = $val;
777                                     }
778                                 } elseif (preg_match('/^\s*(\w+)\s*:/Uis', $slice, $parts)) {
779                                     // name:value pair, where name is unquoted
780                                     $key = $parts[1];
781                                     $val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));
782
783                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
784                                         $obj[$key] = $val;
785                                     } else {
786                                         $obj->$key = $val;
787                                     }
788                                 }
789
790                             }
791
792                         } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
793                             // found a quote, and we are not inside a string
794                             array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
795                             //print("Found start of string at {$c}\n");
796
797                         } elseif (($chrs{$c} == $top['delim']) &&
798                                  ($top['what'] == SERVICES_JSON_IN_STR) &&
799                                  (($this->strlen8($this->substr8($chrs, 0, $c)) - $this->strlen8(rtrim($this->substr8($chrs, 0, $c), '\\'))) % 2 != 1)) {
800                             // found a quote, we're in a string, and it's not escaped
801                             // we know that it's not escaped becase there is _not_ an
802                             // odd number of backslashes at the end of the string so far
803                             array_pop($stk);
804                             //print("Found end of string at {$c}: ".$this->substr8($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
805
806                         } elseif (($chrs{$c} == '[') &&
807                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
808                             // found a left-bracket, and we are in an array, object, or slice
809                             array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
810                             //print("Found start of array at {$c}\n");
811
812                         } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
813                             // found a right-bracket, and we're in an array
814                             array_pop($stk);
815                             //print("Found end of array at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
816
817                         } elseif (($chrs{$c} == '{') &&
818                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
819                             // found a left-brace, and we are in an array, object, or slice
820                             array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
821                             //print("Found start of object at {$c}\n");
822
823                         } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
824                             // found a right-brace, and we're in an object
825                             array_pop($stk);
826                             //print("Found end of object at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
827
828                         } elseif (($substr_chrs_c_2 == '/*') &&
829                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
830                             // found a comment start, and we are in an array, object, or slice
831                             array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
832                             $c++;
833                             //print("Found start of comment at {$c}\n");
834
835                         } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
836                             // found a comment end, and we're in one now
837                             array_pop($stk);
838                             $c++;
839
840                             for ($i = $top['where']; $i <= $c; ++$i)
841                                 $chrs = substr_replace($chrs, ' ', $i, 1);
842
843                             //print("Found end of comment at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
844
845                         }
846
847                     }
848
849                     if (reset($stk) == SERVICES_JSON_IN_ARR) {
850                         return $arr;
851
852                     } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
853                         return $obj;
854
855                     }
856
857                 }
858         }
859     }
860
861     /**
862      * @todo Ultimately, this should just call PEAR::isError()
863      */
864     function isError($data, $code = null)
865     {
866         if (class_exists('pear')) {
867             return PEAR::isError($data, $code);
868         } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
869                                  is_subclass_of($data, 'services_json_error'))) {
870             return true;
871         }
872
873         return false;
874     }
875     
876     /**
877     * Calculates length of string in bytes
878     * @param string 
879     * @return integer length
880     */
881     function strlen8( $str ) 
882     {
883         if ( $this->_mb_strlen ) {
884             return mb_strlen( $str, "8bit" );
885         }
886         return strlen( $str );
887     }
888     
889     /**
890     * Returns part of a string, interpreting $start and $length as number of bytes.
891     * @param string 
892     * @param integer start 
893     * @param integer length 
894     * @return integer length
895     */
896     function substr8( $string, $start, $length=false ) 
897     {
898         if ( $length === false ) {
899             $length = $this->strlen8( $string ) - $start;
900         }
901         if ( $this->_mb_substr ) {
902             return mb_substr( $string, $start, $length, "8bit" );
903         }
904         return substr( $string, $start, $length );
905     }
906
907 }
908
909 if (class_exists('PEAR_Error')) {
910
911     class Services_JSON_Error extends PEAR_Error
912     {
913         function Services_JSON_Error($message = 'unknown error', $code = null,
914                                      $mode = null, $options = null, $userinfo = null)
915         {
916             parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
917         }
918     }
919
920 } else {
921
922     /**
923      * @todo Ultimately, this class shall be descended from PEAR_Error
924      */
925     class Services_JSON_Error
926     {
927         function Services_JSON_Error($message = 'unknown error', $code = null,
928                                      $mode = null, $options = null, $userinfo = null)
929         {
930
931         }
932     }
933     
934 }
935
936 endif;