Wordpress 2.9-scripts
[autoinstalls/wordpress.git] / wp-includes / class-json.php
1 <?php
2 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
3 /**
4  * Converts to and from JSON format.
5  *
6  * JSON (JavaScript Object Notation) is a lightweight data-interchange
7  * format. It is easy for humans to read and write. It is easy for machines
8  * to parse and generate. It is based on a subset of the JavaScript
9  * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
10  * This feature can also be found in  Python. JSON is a text format that is
11  * completely language independent but uses conventions that are familiar
12  * to programmers of the C-family of languages, including C, C++, C#, Java,
13  * JavaScript, Perl, TCL, and many others. These properties make JSON an
14  * ideal data-interchange language.
15  *
16  * This package provides a simple encoder and decoder for JSON notation. It
17  * is intended for use with client-side Javascript applications that make
18  * use of HTTPRequest to perform server communication functions - data can
19  * be encoded into JSON notation for use in a client-side javascript, or
20  * decoded from incoming Javascript requests. JSON format is native to
21  * Javascript, and can be directly eval()'ed with no further parsing
22  * overhead
23  *
24  * All strings should be in ASCII or UTF-8 format!
25  *
26  * LICENSE: Redistribution and use in source and binary forms, with or
27  * without modification, are permitted provided that the following
28  * conditions are met: Redistributions of source code must retain the
29  * above copyright notice, this list of conditions and the following
30  * disclaimer. Redistributions in binary form must reproduce the above
31  * copyright notice, this list of conditions and the following disclaimer
32  * in the documentation and/or other materials provided with the
33  * distribution.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
37  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
38  * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
39  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
40  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
41  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
42  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
43  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
44  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
45  * DAMAGE.
46  *
47  * @category
48  * @package             Services_JSON
49  * @author              Michal Migurski <mike-json@teczno.com>
50  * @author              Matt Knapp <mdknapp[at]gmail[dot]com>
51  * @author              Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
52  * @copyright   2005 Michal Migurski
53  * @version             CVS: $Id: JSON.php,v 1.3 2009/05/22 23:51:00 alan_k Exp $
54  * @license             http://www.opensource.org/licenses/bsd-license.php
55  * @link                http://pear.php.net/pepr/pepr-proposal-show.php?id=198
56  */
57
58 /**
59  * Marker constant for Services_JSON::decode(), used to flag stack state
60  */
61 define('SERVICES_JSON_SLICE', 1);
62
63 /**
64  * Marker constant for Services_JSON::decode(), used to flag stack state
65  */
66 define('SERVICES_JSON_IN_STR',  2);
67
68 /**
69  * Marker constant for Services_JSON::decode(), used to flag stack state
70  */
71 define('SERVICES_JSON_IN_ARR',  3);
72
73 /**
74  * Marker constant for Services_JSON::decode(), used to flag stack state
75  */
76 define('SERVICES_JSON_IN_OBJ',  4);
77
78 /**
79  * Marker constant for Services_JSON::decode(), used to flag stack state
80  */
81 define('SERVICES_JSON_IN_CMT', 5);
82
83 /**
84  * Behavior switch for Services_JSON::decode()
85  */
86 define('SERVICES_JSON_LOOSE_TYPE', 16);
87
88 /**
89  * Behavior switch for Services_JSON::decode()
90  */
91 define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
92
93 /**
94  * Converts to and from JSON format.
95  *
96  * Brief example of use:
97  *
98  * <code>
99  * // create a new instance of Services_JSON
100  * $json = new Services_JSON();
101  *
102  * // convert a complexe value to JSON notation, and send it to the browser
103  * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
104  * $output = $json->encode($value);
105  *
106  * print($output);
107  * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
108  *
109  * // accept incoming POST data, assumed to be in JSON notation
110  * $input = file_get_contents('php://input', 1000000);
111  * $value = $json->decode($input);
112  * </code>
113  */
114 class Services_JSON
115 {
116  /**
117         * constructs a new JSON instance
118         *
119         * @param int $use object behavior flags; combine with boolean-OR
120         *
121         *                                               possible values:
122         *                                               - SERVICES_JSON_LOOSE_TYPE:  loose typing.
123         *                                                               "{...}" syntax creates associative arrays
124         *                                                               instead of objects in decode().
125         *                                               - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
126         *                                                               Values which can't be encoded (e.g. resources)
127         *                                                               appear as NULL instead of throwing errors.
128         *                                                               By default, a deeply-nested resource will
129         *                                                               bubble up with an error, so all return values
130         *                                                               from encode() should be checked with isError()
131         */
132         function Services_JSON($use = 0)
133         {
134                 $this->use = $use;
135         }
136
137  /**
138         * convert a string from one UTF-16 char to one UTF-8 char
139         *
140         * Normally should be handled by mb_convert_encoding, but
141         * provides a slower PHP-only method for installations
142         * that lack the multibye string extension.
143         *
144         * @param        string  $utf16  UTF-16 character
145         * @return string  UTF-8 character
146         * @access private
147         */
148         function utf162utf8($utf16)
149         {
150                 // oh please oh please oh please oh please oh please
151                 if(function_exists('mb_convert_encoding')) {
152                         return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
153                 }
154
155                 $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
156
157                 switch(true) {
158                         case ((0x7F & $bytes) == $bytes):
159                                 // this case should never be reached, because we are in ASCII range
160                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
161                                 return chr(0x7F & $bytes);
162
163                         case (0x07FF & $bytes) == $bytes:
164                                 // return a 2-byte UTF-8 character
165                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
166                                 return chr(0xC0 | (($bytes >> 6) & 0x1F))
167                                         . chr(0x80 | ($bytes & 0x3F));
168
169                         case (0xFFFF & $bytes) == $bytes:
170                                 // return a 3-byte UTF-8 character
171                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
172                                 return chr(0xE0 | (($bytes >> 12) & 0x0F))
173                                         . chr(0x80 | (($bytes >> 6) & 0x3F))
174                                         . chr(0x80 | ($bytes & 0x3F));
175                 }
176
177                 // ignoring UTF-32 for now, sorry
178                 return '';
179         }
180
181  /**
182         * convert a string from one UTF-8 char to one UTF-16 char
183         *
184         * Normally should be handled by mb_convert_encoding, but
185         * provides a slower PHP-only method for installations
186         * that lack the multibye string extension.
187         *
188         * @param        string  $utf8 UTF-8 character
189         * @return string  UTF-16 character
190         * @access private
191         */
192         function utf82utf16($utf8)
193         {
194                 // oh please oh please oh please oh please oh please
195                 if(function_exists('mb_convert_encoding')) {
196                         return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
197                 }
198
199                 switch(strlen($utf8)) {
200                         case 1:
201                                 // this case should never be reached, because we are in ASCII range
202                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
203                                 return $utf8;
204
205                         case 2:
206                                 // return a UTF-16 character from a 2-byte UTF-8 char
207                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
208                                 return chr(0x07 & (ord($utf8{0}) >> 2))
209                                         . chr((0xC0 & (ord($utf8{0}) << 6))
210                                                 | (0x3F & ord($utf8{1})));
211
212                         case 3:
213                                 // return a UTF-16 character from a 3-byte UTF-8 char
214                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
215                                 return chr((0xF0 & (ord($utf8{0}) << 4))
216                                                 | (0x0F & (ord($utf8{1}) >> 2)))
217                                         . chr((0xC0 & (ord($utf8{1}) << 6))
218                                                 | (0x7F & ord($utf8{2})));
219                 }
220
221                 // ignoring UTF-32 for now, sorry
222                 return '';
223         }
224
225  /**
226         * encodes an arbitrary variable into JSON format (and sends JSON Header)
227         *
228         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
229         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
230         *                                               if var is a strng, note that encode() always expects it
231         *                                               to be in ASCII or UTF-8 format!
232         *
233         * @return mixed JSON string representation of input var or an error if a problem occurs
234         * @access public
235         */
236         function encode($var)
237         {
238                 header('Content-type: application/x-javascript');
239                 return $this->_encode($var);
240         }
241         /**
242         * encodes an arbitrary variable into JSON format without JSON Header - warning - may allow CSS!!!!)
243         *
244         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
245         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
246         *                                               if var is a strng, note that encode() always expects it
247         *                                               to be in ASCII or UTF-8 format!
248         *
249         * @return mixed JSON string representation of input var or an error if a problem occurs
250         * @access public
251         */
252         function encodeUnsafe($var)
253         {
254                 return $this->_encode($var);
255         }
256         /**
257         * PRIVATE CODE that does the work of encodes an arbitrary variable into JSON format
258         *
259         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
260         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
261         *                                               if var is a strng, note that encode() always expects it
262         *                                               to be in ASCII or UTF-8 format!
263         *
264         * @return mixed JSON string representation of input var or an error if a problem occurs
265         * @access public
266         */
267         function _encode($var)
268         {
269
270                 switch (gettype($var)) {
271                         case 'boolean':
272                                 return $var ? 'true' : 'false';
273
274                         case 'NULL':
275                                 return 'null';
276
277                         case 'integer':
278                                 return (int) $var;
279
280                         case 'double':
281                         case 'float':
282                                 return (float) $var;
283
284                         case 'string':
285                                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
286                                 $ascii = '';
287                                 $strlen_var = strlen($var);
288
289                         /*
290                                 * Iterate over every character in the string,
291                                 * escaping with a slash or encoding to UTF-8 where necessary
292                                 */
293                                 for ($c = 0; $c < $strlen_var; ++$c) {
294
295                                         $ord_var_c = ord($var{$c});
296
297                                         switch (true) {
298                                                 case $ord_var_c == 0x08:
299                                                         $ascii .= '\b';
300                                                         break;
301                                                 case $ord_var_c == 0x09:
302                                                         $ascii .= '\t';
303                                                         break;
304                                                 case $ord_var_c == 0x0A:
305                                                         $ascii .= '\n';
306                                                         break;
307                                                 case $ord_var_c == 0x0C:
308                                                         $ascii .= '\f';
309                                                         break;
310                                                 case $ord_var_c == 0x0D:
311                                                         $ascii .= '\r';
312                                                         break;
313
314                                                 case $ord_var_c == 0x22:
315                                                 case $ord_var_c == 0x2F:
316                                                 case $ord_var_c == 0x5C:
317                                                         // double quote, slash, slosh
318                                                         $ascii .= '\\'.$var{$c};
319                                                         break;
320
321                                                 case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
322                                                         // characters U-00000000 - U-0000007F (same as ASCII)
323                                                         $ascii .= $var{$c};
324                                                         break;
325
326                                                 case (($ord_var_c & 0xE0) == 0xC0):
327                                                         // characters U-00000080 - U-000007FF, mask 110XXXXX
328                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
329                                                         if ($c+1 >= $strlen_var) {
330                                                                 $c += 1;
331                                                                 $ascii .= '?';
332                                                                 break;
333                                                         }
334
335                                                         $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
336                                                         $c += 1;
337                                                         $utf16 = $this->utf82utf16($char);
338                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
339                                                         break;
340
341                                                 case (($ord_var_c & 0xF0) == 0xE0):
342                                                         if ($c+2 >= $strlen_var) {
343                                                                 $c += 2;
344                                                                 $ascii .= '?';
345                                                                 break;
346                                                         }
347                                                         // characters U-00000800 - U-0000FFFF, mask 1110XXXX
348                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
349                                                         $char = pack('C*', $ord_var_c,
350                                                                                 @ord($var{$c + 1}),
351                                                                                 @ord($var{$c + 2}));
352                                                         $c += 2;
353                                                         $utf16 = $this->utf82utf16($char);
354                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
355                                                         break;
356
357                                                 case (($ord_var_c & 0xF8) == 0xF0):
358                                                         if ($c+3 >= $strlen_var) {
359                                                                 $c += 3;
360                                                                 $ascii .= '?';
361                                                                 break;
362                                                         }
363                                                         // characters U-00010000 - U-001FFFFF, mask 11110XXX
364                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
365                                                         $char = pack('C*', $ord_var_c,
366                                                                                 ord($var{$c + 1}),
367                                                                                 ord($var{$c + 2}),
368                                                                                 ord($var{$c + 3}));
369                                                         $c += 3;
370                                                         $utf16 = $this->utf82utf16($char);
371                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
372                                                         break;
373
374                                                 case (($ord_var_c & 0xFC) == 0xF8):
375                                                         // characters U-00200000 - U-03FFFFFF, mask 111110XX
376                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
377                                                         if ($c+4 >= $strlen_var) {
378                                                                 $c += 4;
379                                                                 $ascii .= '?';
380                                                                 break;
381                                                         }
382                                                         $char = pack('C*', $ord_var_c,
383                                                                                 ord($var{$c + 1}),
384                                                                                 ord($var{$c + 2}),
385                                                                                 ord($var{$c + 3}),
386                                                                                 ord($var{$c + 4}));
387                                                         $c += 4;
388                                                         $utf16 = $this->utf82utf16($char);
389                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
390                                                         break;
391
392                                                 case (($ord_var_c & 0xFE) == 0xFC):
393                                                 if ($c+5 >= $strlen_var) {
394                                                                 $c += 5;
395                                                                 $ascii .= '?';
396                                                                 break;
397                                                         }
398                                                         // characters U-04000000 - U-7FFFFFFF, mask 1111110X
399                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
400                                                         $char = pack('C*', $ord_var_c,
401                                                                                 ord($var{$c + 1}),
402                                                                                 ord($var{$c + 2}),
403                                                                                 ord($var{$c + 3}),
404                                                                                 ord($var{$c + 4}),
405                                                                                 ord($var{$c + 5}));
406                                                         $c += 5;
407                                                         $utf16 = $this->utf82utf16($char);
408                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
409                                                         break;
410                                         }
411                                 }
412                                 return  '"'.$ascii.'"';
413
414                         case 'array':
415                         /*
416                                 * As per JSON spec if any array key is not an integer
417                                 * we must treat the the whole array as an object. We
418                                 * also try to catch a sparsely populated associative
419                                 * array with numeric keys here because some JS engines
420                                 * will create an array with empty indexes up to
421                                 * max_index which can cause memory issues and because
422                                 * the keys, which may be relevant, will be remapped
423                                 * otherwise.
424                                 *
425                                 * As per the ECMA and JSON specification an object may
426                                 * have any string as a property. Unfortunately due to
427                                 * a hole in the ECMA specification if the key is a
428                                 * ECMA reserved word or starts with a digit the
429                                 * parameter is only accessible using ECMAScript's
430                                 * bracket notation.
431                                 */
432
433                                 // treat as a JSON object
434                                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
435                                         $properties = array_map(array($this, 'name_value'),
436                                                                                         array_keys($var),
437                                                                                         array_values($var));
438
439                                         foreach($properties as $property) {
440                                                 if(Services_JSON::isError($property)) {
441                                                         return $property;
442                                                 }
443                                         }
444
445                                         return '{' . join(',', $properties) . '}';
446                                 }
447
448                                 // treat it like a regular array
449                                 $elements = array_map(array($this, '_encode'), $var);
450
451                                 foreach($elements as $element) {
452                                         if(Services_JSON::isError($element)) {
453                                                 return $element;
454                                         }
455                                 }
456
457                                 return '[' . join(',', $elements) . ']';
458
459                         case 'object':
460                                 $vars = get_object_vars($var);
461
462                                 $properties = array_map(array($this, 'name_value'),
463                                                                                 array_keys($vars),
464                                                                                 array_values($vars));
465
466                                 foreach($properties as $property) {
467                                         if(Services_JSON::isError($property)) {
468                                                 return $property;
469                                         }
470                                 }
471
472                                 return '{' . join(',', $properties) . '}';
473
474                         default:
475                                 return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
476                                         ? 'null'
477                                         : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
478                 }
479         }
480
481  /**
482         * array-walking function for use in generating JSON-formatted name-value pairs
483         *
484         * @param        string  $name name of key to use
485         * @param        mixed $value  reference to an array element to be encoded
486         *
487         * @return string  JSON-formatted name-value pair, like '"name":value'
488         * @access private
489         */
490         function name_value($name, $value)
491         {
492                 $encoded_value = $this->_encode($value);
493
494                 if(Services_JSON::isError($encoded_value)) {
495                         return $encoded_value;
496                 }
497
498                 return $this->_encode(strval($name)) . ':' . $encoded_value;
499         }
500
501  /**
502         * reduce a string by removing leading and trailing comments and whitespace
503         *
504         * @param        $str    string  string value to strip of comments and whitespace
505         *
506         * @return string  string value stripped of comments and whitespace
507         * @access private
508         */
509         function reduce_string($str)
510         {
511                 $str = preg_replace(array(
512
513                                 // eliminate single line comments in '// ...' form
514                                 '#^\s*//(.+)$#m',
515
516                                 // eliminate multi-line comments in '/* ... */' form, at start of string
517                                 '#^\s*/\*(.+)\*/#Us',
518
519                                 // eliminate multi-line comments in '/* ... */' form, at end of string
520                                 '#/\*(.+)\*/\s*$#Us'
521
522                         ), '', $str);
523
524                 // eliminate extraneous space
525                 return trim($str);
526         }
527
528  /**
529         * decodes a JSON string into appropriate variable
530         *
531         * @param        string  $str    JSON-formatted string
532         *
533         * @return mixed number, boolean, string, array, or object
534         *                               corresponding to given JSON input string.
535         *                               See argument 1 to Services_JSON() above for object-output behavior.
536         *                               Note that decode() always returns strings
537         *                               in ASCII or UTF-8 format!
538         * @access public
539         */
540         function decode($str)
541         {
542                 $str = $this->reduce_string($str);
543
544                 switch (strtolower($str)) {
545                         case 'true':
546                                 return true;
547
548                         case 'false':
549                                 return false;
550
551                         case 'null':
552                                 return null;
553
554                         default:
555                                 $m = array();
556
557                                 if (is_numeric($str)) {
558                                         // Lookie-loo, it's a number
559
560                                         // This would work on its own, but I'm trying to be
561                                         // good about returning integers where appropriate:
562                                         // return (float)$str;
563
564                                         // Return float or int, as appropriate
565                                         return ((float)$str == (integer)$str)
566                                                 ? (integer)$str
567                                                 : (float)$str;
568
569                                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
570                                         // STRINGS RETURNED IN UTF-8 FORMAT
571                                         $delim = substr($str, 0, 1);
572                                         $chrs = substr($str, 1, -1);
573                                         $utf8 = '';
574                                         $strlen_chrs = strlen($chrs);
575
576                                         for ($c = 0; $c < $strlen_chrs; ++$c) {
577
578                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
579                                                 $ord_chrs_c = ord($chrs{$c});
580
581                                                 switch (true) {
582                                                         case $substr_chrs_c_2 == '\b':
583                                                                 $utf8 .= chr(0x08);
584                                                                 ++$c;
585                                                                 break;
586                                                         case $substr_chrs_c_2 == '\t':
587                                                                 $utf8 .= chr(0x09);
588                                                                 ++$c;
589                                                                 break;
590                                                         case $substr_chrs_c_2 == '\n':
591                                                                 $utf8 .= chr(0x0A);
592                                                                 ++$c;
593                                                                 break;
594                                                         case $substr_chrs_c_2 == '\f':
595                                                                 $utf8 .= chr(0x0C);
596                                                                 ++$c;
597                                                                 break;
598                                                         case $substr_chrs_c_2 == '\r':
599                                                                 $utf8 .= chr(0x0D);
600                                                                 ++$c;
601                                                                 break;
602
603                                                         case $substr_chrs_c_2 == '\\"':
604                                                         case $substr_chrs_c_2 == '\\\'':
605                                                         case $substr_chrs_c_2 == '\\\\':
606                                                         case $substr_chrs_c_2 == '\\/':
607                                                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
608                                                                 ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
609                                                                         $utf8 .= $chrs{++$c};
610                                                                 }
611                                                                 break;
612
613                                                         case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
614                                                                 // single, escaped unicode character
615                                                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
616                                                                         . chr(hexdec(substr($chrs, ($c + 4), 2)));
617                                                                 $utf8 .= $this->utf162utf8($utf16);
618                                                                 $c += 5;
619                                                                 break;
620
621                                                         case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
622                                                                 $utf8 .= $chrs{$c};
623                                                                 break;
624
625                                                         case ($ord_chrs_c & 0xE0) == 0xC0:
626                                                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
627                                                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
628                                                                 $utf8 .= substr($chrs, $c, 2);
629                                                                 ++$c;
630                                                                 break;
631
632                                                         case ($ord_chrs_c & 0xF0) == 0xE0:
633                                                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
634                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
635                                                                 $utf8 .= substr($chrs, $c, 3);
636                                                                 $c += 2;
637                                                                 break;
638
639                                                         case ($ord_chrs_c & 0xF8) == 0xF0:
640                                                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
641                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
642                                                                 $utf8 .= substr($chrs, $c, 4);
643                                                                 $c += 3;
644                                                                 break;
645
646                                                         case ($ord_chrs_c & 0xFC) == 0xF8:
647                                                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
648                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
649                                                                 $utf8 .= substr($chrs, $c, 5);
650                                                                 $c += 4;
651                                                                 break;
652
653                                                         case ($ord_chrs_c & 0xFE) == 0xFC:
654                                                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
655                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
656                                                                 $utf8 .= substr($chrs, $c, 6);
657                                                                 $c += 5;
658                                                                 break;
659
660                                                 }
661
662                                         }
663
664                                         return $utf8;
665
666                                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
667                                         // array, or object notation
668
669                                         if ($str{0} == '[') {
670                                                 $stk = array(SERVICES_JSON_IN_ARR);
671                                                 $arr = array();
672                                         } else {
673                                                 if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
674                                                         $stk = array(SERVICES_JSON_IN_OBJ);
675                                                         $obj = array();
676                                                 } else {
677                                                         $stk = array(SERVICES_JSON_IN_OBJ);
678                                                         $obj = new stdClass();
679                                                 }
680                                         }
681
682                                         array_push($stk, array('what'  => SERVICES_JSON_SLICE,
683                                                                                 'where' => 0,
684                                                                                 'delim' => false));
685
686                                         $chrs = substr($str, 1, -1);
687                                         $chrs = $this->reduce_string($chrs);
688
689                                         if ($chrs == '') {
690                                                 if (reset($stk) == SERVICES_JSON_IN_ARR) {
691                                                         return $arr;
692
693                                                 } else {
694                                                         return $obj;
695
696                                                 }
697                                         }
698
699                                         //print("\nparsing {$chrs}\n");
700
701                                         $strlen_chrs = strlen($chrs);
702
703                                         for ($c = 0; $c <= $strlen_chrs; ++$c) {
704
705                                                 $top = end($stk);
706                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
707
708                                                 if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
709                                                         // found a comma that is not inside a string, array, etc.,
710                                                         // OR we've reached the end of the character list
711                                                         $slice = substr($chrs, $top['where'], ($c - $top['where']));
712                                                         array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
713                                                         //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
714
715                                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
716                                                                 // we are in an array, so just push an element onto the stack
717                                                                 array_push($arr, $this->decode($slice));
718
719                                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
720                                                                 // we are in an object, so figure
721                                                                 // out the property name and set an
722                                                                 // element in an associative array,
723                                                                 // for now
724                                                                 $parts = array();
725
726                                                                 if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
727                                                                         // "name":value pair
728                                                                         $key = $this->decode($parts[1]);
729                                                                         $val = $this->decode($parts[2]);
730
731                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
732                                                                                 $obj[$key] = $val;
733                                                                         } else {
734                                                                                 $obj->$key = $val;
735                                                                         }
736                                                                 } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
737                                                                         // name:value pair, where name is unquoted
738                                                                         $key = $parts[1];
739                                                                         $val = $this->decode($parts[2]);
740
741                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
742                                                                                 $obj[$key] = $val;
743                                                                         } else {
744                                                                                 $obj->$key = $val;
745                                                                         }
746                                                                 }
747
748                                                         }
749
750                                                 } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
751                                                         // found a quote, and we are not inside a string
752                                                         array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
753                                                         //print("Found start of string at {$c}\n");
754
755                                                 } elseif (($chrs{$c} == $top['delim']) &&
756                                                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
757                                                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
758                                                         // found a quote, we're in a string, and it's not escaped
759                                                         // we know that it's not escaped becase there is _not_ an
760                                                         // odd number of backslashes at the end of the string so far
761                                                         array_pop($stk);
762                                                         //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
763
764                                                 } elseif (($chrs{$c} == '[') &&
765                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
766                                                         // found a left-bracket, and we are in an array, object, or slice
767                                                         array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
768                                                         //print("Found start of array at {$c}\n");
769
770                                                 } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
771                                                         // found a right-bracket, and we're in an array
772                                                         array_pop($stk);
773                                                         //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
774
775                                                 } elseif (($chrs{$c} == '{') &&
776                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
777                                                         // found a left-brace, and we are in an array, object, or slice
778                                                         array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
779                                                         //print("Found start of object at {$c}\n");
780
781                                                 } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
782                                                         // found a right-brace, and we're in an object
783                                                         array_pop($stk);
784                                                         //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
785
786                                                 } elseif (($substr_chrs_c_2 == '/*') &&
787                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
788                                                         // found a comment start, and we are in an array, object, or slice
789                                                         array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
790                                                         $c++;
791                                                         //print("Found start of comment at {$c}\n");
792
793                                                 } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
794                                                         // found a comment end, and we're in one now
795                                                         array_pop($stk);
796                                                         $c++;
797
798                                                         for ($i = $top['where']; $i <= $c; ++$i)
799                                                                 $chrs = substr_replace($chrs, ' ', $i, 1);
800
801                                                         //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
802
803                                                 }
804
805                                         }
806
807                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
808                                                 return $arr;
809
810                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
811                                                 return $obj;
812
813                                         }
814
815                                 }
816                 }
817         }
818
819         /**
820         * @todo Ultimately, this should just call PEAR::isError()
821         */
822         function isError($data, $code = null)
823         {
824                 if (class_exists('pear')) {
825                         return PEAR::isError($data, $code);
826                 } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
827                                                                 is_subclass_of($data, 'services_json_error'))) {
828                         return true;
829                 }
830
831                 return false;
832         }
833 }
834
835 if (class_exists('PEAR_Error')) {
836
837         class Services_JSON_Error extends PEAR_Error
838         {
839                 function Services_JSON_Error($message = 'unknown error', $code = null,
840                                                                         $mode = null, $options = null, $userinfo = null)
841                 {
842                         parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
843                 }
844         }
845
846 } else {
847
848         /**
849         * @todo Ultimately, this class shall be descended from PEAR_Error
850         */
851         class Services_JSON_Error
852         {
853                 function Services_JSON_Error($message = 'unknown error', $code = null,
854                                                                         $mode = null, $options = null, $userinfo = null)
855                 {
856
857                 }
858         }
859
860 }