WordPress 3.4
[autoinstalls/wordpress.git] / 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 288200 2009-09-09 15:41:29Z 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  * Converts to and from JSON format.
96  *
97  * Brief example of use:
98  *
99  * <code>
100  * // create a new instance of Services_JSON
101  * $json = new Services_JSON();
102  *
103  * // convert a complexe value to JSON notation, and send it to the browser
104  * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
105  * $output = $json->encode($value);
106  *
107  * print($output);
108  * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
109  *
110  * // accept incoming POST data, assumed to be in JSON notation
111  * $input = file_get_contents('php://input', 1000000);
112  * $value = $json->decode($input);
113  * </code>
114  */
115 class Services_JSON
116 {
117  /**
118         * constructs a new JSON instance
119         *
120         * @param int $use object behavior flags; combine with boolean-OR
121         *
122         *                                               possible values:
123         *                                               - SERVICES_JSON_LOOSE_TYPE:  loose typing.
124         *                                                               "{...}" syntax creates associative arrays
125         *                                                               instead of objects in decode().
126         *                                               - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
127         *                                                               Values which can't be encoded (e.g. resources)
128         *                                                               appear as NULL instead of throwing errors.
129         *                                                               By default, a deeply-nested resource will
130         *                                                               bubble up with an error, so all return values
131         *                                                               from encode() should be checked with isError()
132         */
133         function Services_JSON($use = 0)
134         {
135                 $this->use = $use;
136         }
137
138  /**
139         * convert a string from one UTF-16 char to one UTF-8 char
140         *
141         * Normally should be handled by mb_convert_encoding, but
142         * provides a slower PHP-only method for installations
143         * that lack the multibye string extension.
144         *
145         * @param        string  $utf16  UTF-16 character
146         * @return string  UTF-8 character
147         * @access private
148         */
149         function utf162utf8($utf16)
150         {
151                 // oh please oh please oh please oh please oh please
152                 if(function_exists('mb_convert_encoding')) {
153                         return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
154                 }
155
156                 $bytes = (ord($utf16[0]) << 8) | ord($utf16[1]);
157
158                 switch(true) {
159                         case ((0x7F & $bytes) == $bytes):
160                                 // this case should never be reached, because we are in ASCII range
161                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
162                                 return chr(0x7F & $bytes);
163
164                         case (0x07FF & $bytes) == $bytes:
165                                 // return a 2-byte UTF-8 character
166                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
167                                 return chr(0xC0 | (($bytes >> 6) & 0x1F))
168                                         . chr(0x80 | ($bytes & 0x3F));
169
170                         case (0xFFFF & $bytes) == $bytes:
171                                 // return a 3-byte UTF-8 character
172                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
173                                 return chr(0xE0 | (($bytes >> 12) & 0x0F))
174                                         . chr(0x80 | (($bytes >> 6) & 0x3F))
175                                         . chr(0x80 | ($bytes & 0x3F));
176                 }
177
178                 // ignoring UTF-32 for now, sorry
179                 return '';
180         }
181
182  /**
183         * convert a string from one UTF-8 char to one UTF-16 char
184         *
185         * Normally should be handled by mb_convert_encoding, but
186         * provides a slower PHP-only method for installations
187         * that lack the multibye string extension.
188         *
189         * @param        string  $utf8 UTF-8 character
190         * @return string  UTF-16 character
191         * @access private
192         */
193         function utf82utf16($utf8)
194         {
195                 // oh please oh please oh please oh please oh please
196                 if(function_exists('mb_convert_encoding')) {
197                         return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
198                 }
199
200                 switch(strlen($utf8)) {
201                         case 1:
202                                 // this case should never be reached, because we are in ASCII range
203                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
204                                 return $utf8;
205
206                         case 2:
207                                 // return a UTF-16 character from a 2-byte UTF-8 char
208                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
209                                 return chr(0x07 & (ord($utf8[0]) >> 2))
210                                         . chr((0xC0 & (ord($utf8[0]) << 6))
211                                                 | (0x3F & ord($utf8[1])));
212
213                         case 3:
214                                 // return a UTF-16 character from a 3-byte UTF-8 char
215                                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
216                                 return chr((0xF0 & (ord($utf8[0]) << 4))
217                                                 | (0x0F & (ord($utf8[1]) >> 2)))
218                                         . chr((0xC0 & (ord($utf8[1]) << 6))
219                                                 | (0x7F & ord($utf8[2])));
220                 }
221
222                 // ignoring UTF-32 for now, sorry
223                 return '';
224         }
225
226  /**
227         * encodes an arbitrary variable into JSON format (and sends JSON Header)
228         *
229         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
230         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
231         *                                               if var is a strng, note that encode() always expects it
232         *                                               to be in ASCII or UTF-8 format!
233         *
234         * @return mixed JSON string representation of input var or an error if a problem occurs
235         * @access public
236         */
237         function encode($var)
238         {
239                 header('Content-type: application/json');
240                 return $this->_encode($var);
241         }
242         /**
243         * encodes an arbitrary variable into JSON format without JSON Header - warning - may allow CSS!!!!)
244         *
245         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
246         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
247         *                                               if var is a strng, note that encode() always expects it
248         *                                               to be in ASCII or UTF-8 format!
249         *
250         * @return mixed JSON string representation of input var or an error if a problem occurs
251         * @access public
252         */
253         function encodeUnsafe($var)
254         {
255                 return $this->_encode($var);
256         }
257         /**
258         * PRIVATE CODE that does the work of encodes an arbitrary variable into JSON format
259         *
260         * @param        mixed $var      any number, boolean, string, array, or object to be encoded.
261         *                                               see argument 1 to Services_JSON() above for array-parsing behavior.
262         *                                               if var is a strng, note that encode() always expects it
263         *                                               to be in ASCII or UTF-8 format!
264         *
265         * @return mixed JSON string representation of input var or an error if a problem occurs
266         * @access public
267         */
268         function _encode($var)
269         {
270
271                 switch (gettype($var)) {
272                         case 'boolean':
273                                 return $var ? 'true' : 'false';
274
275                         case 'NULL':
276                                 return 'null';
277
278                         case 'integer':
279                                 return (int) $var;
280
281                         case 'double':
282                         case 'float':
283                                 return (float) $var;
284
285                         case 'string':
286                                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
287                                 $ascii = '';
288                                 $strlen_var = strlen($var);
289
290                         /*
291                                 * Iterate over every character in the string,
292                                 * escaping with a slash or encoding to UTF-8 where necessary
293                                 */
294                                 for ($c = 0; $c < $strlen_var; ++$c) {
295
296                                         $ord_var_c = ord($var[$c]);
297
298                                         switch (true) {
299                                                 case $ord_var_c == 0x08:
300                                                         $ascii .= '\b';
301                                                         break;
302                                                 case $ord_var_c == 0x09:
303                                                         $ascii .= '\t';
304                                                         break;
305                                                 case $ord_var_c == 0x0A:
306                                                         $ascii .= '\n';
307                                                         break;
308                                                 case $ord_var_c == 0x0C:
309                                                         $ascii .= '\f';
310                                                         break;
311                                                 case $ord_var_c == 0x0D:
312                                                         $ascii .= '\r';
313                                                         break;
314
315                                                 case $ord_var_c == 0x22:
316                                                 case $ord_var_c == 0x2F:
317                                                 case $ord_var_c == 0x5C:
318                                                         // double quote, slash, slosh
319                                                         $ascii .= '\\'.$var[$c];
320                                                         break;
321
322                                                 case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
323                                                         // characters U-00000000 - U-0000007F (same as ASCII)
324                                                         $ascii .= $var[$c];
325                                                         break;
326
327                                                 case (($ord_var_c & 0xE0) == 0xC0):
328                                                         // characters U-00000080 - U-000007FF, mask 110XXXXX
329                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
330                                                         if ($c+1 >= $strlen_var) {
331                                                                 $c += 1;
332                                                                 $ascii .= '?';
333                                                                 break;
334                                                         }
335
336                                                         $char = pack('C*', $ord_var_c, ord($var[$c + 1]));
337                                                         $c += 1;
338                                                         $utf16 = $this->utf82utf16($char);
339                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
340                                                         break;
341
342                                                 case (($ord_var_c & 0xF0) == 0xE0):
343                                                         if ($c+2 >= $strlen_var) {
344                                                                 $c += 2;
345                                                                 $ascii .= '?';
346                                                                 break;
347                                                         }
348                                                         // characters U-00000800 - U-0000FFFF, mask 1110XXXX
349                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
350                                                         $char = pack('C*', $ord_var_c,
351                                                                                 @ord($var[$c + 1]),
352                                                                                 @ord($var[$c + 2]));
353                                                         $c += 2;
354                                                         $utf16 = $this->utf82utf16($char);
355                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
356                                                         break;
357
358                                                 case (($ord_var_c & 0xF8) == 0xF0):
359                                                         if ($c+3 >= $strlen_var) {
360                                                                 $c += 3;
361                                                                 $ascii .= '?';
362                                                                 break;
363                                                         }
364                                                         // characters U-00010000 - U-001FFFFF, mask 11110XXX
365                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
366                                                         $char = pack('C*', $ord_var_c,
367                                                                                 ord($var[$c + 1]),
368                                                                                 ord($var[$c + 2]),
369                                                                                 ord($var[$c + 3]));
370                                                         $c += 3;
371                                                         $utf16 = $this->utf82utf16($char);
372                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
373                                                         break;
374
375                                                 case (($ord_var_c & 0xFC) == 0xF8):
376                                                         // characters U-00200000 - U-03FFFFFF, mask 111110XX
377                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
378                                                         if ($c+4 >= $strlen_var) {
379                                                                 $c += 4;
380                                                                 $ascii .= '?';
381                                                                 break;
382                                                         }
383                                                         $char = pack('C*', $ord_var_c,
384                                                                                 ord($var[$c + 1]),
385                                                                                 ord($var[$c + 2]),
386                                                                                 ord($var[$c + 3]),
387                                                                                 ord($var[$c + 4]));
388                                                         $c += 4;
389                                                         $utf16 = $this->utf82utf16($char);
390                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
391                                                         break;
392
393                                                 case (($ord_var_c & 0xFE) == 0xFC):
394                                                 if ($c+5 >= $strlen_var) {
395                                                                 $c += 5;
396                                                                 $ascii .= '?';
397                                                                 break;
398                                                         }
399                                                         // characters U-04000000 - U-7FFFFFFF, mask 1111110X
400                                                         // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
401                                                         $char = pack('C*', $ord_var_c,
402                                                                                 ord($var[$c + 1]),
403                                                                                 ord($var[$c + 2]),
404                                                                                 ord($var[$c + 3]),
405                                                                                 ord($var[$c + 4]),
406                                                                                 ord($var[$c + 5]));
407                                                         $c += 5;
408                                                         $utf16 = $this->utf82utf16($char);
409                                                         $ascii .= sprintf('\u%04s', bin2hex($utf16));
410                                                         break;
411                                         }
412                                 }
413                                 return  '"'.$ascii.'"';
414
415                         case 'array':
416                         /*
417                                 * As per JSON spec if any array key is not an integer
418                                 * we must treat the the whole array as an object. We
419                                 * also try to catch a sparsely populated associative
420                                 * array with numeric keys here because some JS engines
421                                 * will create an array with empty indexes up to
422                                 * max_index which can cause memory issues and because
423                                 * the keys, which may be relevant, will be remapped
424                                 * otherwise.
425                                 *
426                                 * As per the ECMA and JSON specification an object may
427                                 * have any string as a property. Unfortunately due to
428                                 * a hole in the ECMA specification if the key is a
429                                 * ECMA reserved word or starts with a digit the
430                                 * parameter is only accessible using ECMAScript's
431                                 * bracket notation.
432                                 */
433
434                                 // treat as a JSON object
435                                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
436                                         $properties = array_map(array($this, 'name_value'),
437                                                                                         array_keys($var),
438                                                                                         array_values($var));
439
440                                         foreach($properties as $property) {
441                                                 if(Services_JSON::isError($property)) {
442                                                         return $property;
443                                                 }
444                                         }
445
446                                         return '{' . join(',', $properties) . '}';
447                                 }
448
449                                 // treat it like a regular array
450                                 $elements = array_map(array($this, '_encode'), $var);
451
452                                 foreach($elements as $element) {
453                                         if(Services_JSON::isError($element)) {
454                                                 return $element;
455                                         }
456                                 }
457
458                                 return '[' . join(',', $elements) . ']';
459
460                         case 'object':
461                                 $vars = get_object_vars($var);
462
463                                 $properties = array_map(array($this, 'name_value'),
464                                                                                 array_keys($vars),
465                                                                                 array_values($vars));
466
467                                 foreach($properties as $property) {
468                                         if(Services_JSON::isError($property)) {
469                                                 return $property;
470                                         }
471                                 }
472
473                                 return '{' . join(',', $properties) . '}';
474
475                         default:
476                                 return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
477                                         ? 'null'
478                                         : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
479                 }
480         }
481
482  /**
483         * array-walking function for use in generating JSON-formatted name-value pairs
484         *
485         * @param        string  $name name of key to use
486         * @param        mixed $value  reference to an array element to be encoded
487         *
488         * @return string  JSON-formatted name-value pair, like '"name":value'
489         * @access private
490         */
491         function name_value($name, $value)
492         {
493                 $encoded_value = $this->_encode($value);
494
495                 if(Services_JSON::isError($encoded_value)) {
496                         return $encoded_value;
497                 }
498
499                 return $this->_encode(strval($name)) . ':' . $encoded_value;
500         }
501
502  /**
503         * reduce a string by removing leading and trailing comments and whitespace
504         *
505         * @param        $str    string  string value to strip of comments and whitespace
506         *
507         * @return string  string value stripped of comments and whitespace
508         * @access private
509         */
510         function reduce_string($str)
511         {
512                 $str = preg_replace(array(
513
514                                 // eliminate single line comments in '// ...' form
515                                 '#^\s*//(.+)$#m',
516
517                                 // eliminate multi-line comments in '/* ... */' form, at start of string
518                                 '#^\s*/\*(.+)\*/#Us',
519
520                                 // eliminate multi-line comments in '/* ... */' form, at end of string
521                                 '#/\*(.+)\*/\s*$#Us'
522
523                         ), '', $str);
524
525                 // eliminate extraneous space
526                 return trim($str);
527         }
528
529  /**
530         * decodes a JSON string into appropriate variable
531         *
532         * @param        string  $str    JSON-formatted string
533         *
534         * @return mixed number, boolean, string, array, or object
535         *                               corresponding to given JSON input string.
536         *                               See argument 1 to Services_JSON() above for object-output behavior.
537         *                               Note that decode() always returns strings
538         *                               in ASCII or UTF-8 format!
539         * @access public
540         */
541         function decode($str)
542         {
543                 $str = $this->reduce_string($str);
544
545                 switch (strtolower($str)) {
546                         case 'true':
547                                 return true;
548
549                         case 'false':
550                                 return false;
551
552                         case 'null':
553                                 return null;
554
555                         default:
556                                 $m = array();
557
558                                 if (is_numeric($str)) {
559                                         // Lookie-loo, it's a number
560
561                                         // This would work on its own, but I'm trying to be
562                                         // good about returning integers where appropriate:
563                                         // return (float)$str;
564
565                                         // Return float or int, as appropriate
566                                         return ((float)$str == (integer)$str)
567                                                 ? (integer)$str
568                                                 : (float)$str;
569
570                                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
571                                         // STRINGS RETURNED IN UTF-8 FORMAT
572                                         $delim = substr($str, 0, 1);
573                                         $chrs = substr($str, 1, -1);
574                                         $utf8 = '';
575                                         $strlen_chrs = strlen($chrs);
576
577                                         for ($c = 0; $c < $strlen_chrs; ++$c) {
578
579                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
580                                                 $ord_chrs_c = ord($chrs[$c]);
581
582                                                 switch (true) {
583                                                         case $substr_chrs_c_2 == '\b':
584                                                                 $utf8 .= chr(0x08);
585                                                                 ++$c;
586                                                                 break;
587                                                         case $substr_chrs_c_2 == '\t':
588                                                                 $utf8 .= chr(0x09);
589                                                                 ++$c;
590                                                                 break;
591                                                         case $substr_chrs_c_2 == '\n':
592                                                                 $utf8 .= chr(0x0A);
593                                                                 ++$c;
594                                                                 break;
595                                                         case $substr_chrs_c_2 == '\f':
596                                                                 $utf8 .= chr(0x0C);
597                                                                 ++$c;
598                                                                 break;
599                                                         case $substr_chrs_c_2 == '\r':
600                                                                 $utf8 .= chr(0x0D);
601                                                                 ++$c;
602                                                                 break;
603
604                                                         case $substr_chrs_c_2 == '\\"':
605                                                         case $substr_chrs_c_2 == '\\\'':
606                                                         case $substr_chrs_c_2 == '\\\\':
607                                                         case $substr_chrs_c_2 == '\\/':
608                                                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
609                                                                 ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
610                                                                         $utf8 .= $chrs[++$c];
611                                                                 }
612                                                                 break;
613
614                                                         case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
615                                                                 // single, escaped unicode character
616                                                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
617                                                                         . chr(hexdec(substr($chrs, ($c + 4), 2)));
618                                                                 $utf8 .= $this->utf162utf8($utf16);
619                                                                 $c += 5;
620                                                                 break;
621
622                                                         case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
623                                                                 $utf8 .= $chrs[$c];
624                                                                 break;
625
626                                                         case ($ord_chrs_c & 0xE0) == 0xC0:
627                                                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
628                                                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
629                                                                 $utf8 .= substr($chrs, $c, 2);
630                                                                 ++$c;
631                                                                 break;
632
633                                                         case ($ord_chrs_c & 0xF0) == 0xE0:
634                                                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
635                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
636                                                                 $utf8 .= substr($chrs, $c, 3);
637                                                                 $c += 2;
638                                                                 break;
639
640                                                         case ($ord_chrs_c & 0xF8) == 0xF0:
641                                                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
642                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
643                                                                 $utf8 .= substr($chrs, $c, 4);
644                                                                 $c += 3;
645                                                                 break;
646
647                                                         case ($ord_chrs_c & 0xFC) == 0xF8:
648                                                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
649                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
650                                                                 $utf8 .= substr($chrs, $c, 5);
651                                                                 $c += 4;
652                                                                 break;
653
654                                                         case ($ord_chrs_c & 0xFE) == 0xFC:
655                                                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
656                                                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
657                                                                 $utf8 .= substr($chrs, $c, 6);
658                                                                 $c += 5;
659                                                                 break;
660
661                                                 }
662
663                                         }
664
665                                         return $utf8;
666
667                                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
668                                         // array, or object notation
669
670                                         if ($str[0] == '[') {
671                                                 $stk = array(SERVICES_JSON_IN_ARR);
672                                                 $arr = array();
673                                         } else {
674                                                 if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
675                                                         $stk = array(SERVICES_JSON_IN_OBJ);
676                                                         $obj = array();
677                                                 } else {
678                                                         $stk = array(SERVICES_JSON_IN_OBJ);
679                                                         $obj = new stdClass();
680                                                 }
681                                         }
682
683                                         array_push($stk, array('what'  => SERVICES_JSON_SLICE,
684                                                                                 'where' => 0,
685                                                                                 'delim' => false));
686
687                                         $chrs = substr($str, 1, -1);
688                                         $chrs = $this->reduce_string($chrs);
689
690                                         if ($chrs == '') {
691                                                 if (reset($stk) == SERVICES_JSON_IN_ARR) {
692                                                         return $arr;
693
694                                                 } else {
695                                                         return $obj;
696
697                                                 }
698                                         }
699
700                                         //print("\nparsing {$chrs}\n");
701
702                                         $strlen_chrs = strlen($chrs);
703
704                                         for ($c = 0; $c <= $strlen_chrs; ++$c) {
705
706                                                 $top = end($stk);
707                                                 $substr_chrs_c_2 = substr($chrs, $c, 2);
708
709                                                 if (($c == $strlen_chrs) || (($chrs[$c] == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
710                                                         // found a comma that is not inside a string, array, etc.,
711                                                         // OR we've reached the end of the character list
712                                                         $slice = substr($chrs, $top['where'], ($c - $top['where']));
713                                                         array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
714                                                         //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
715
716                                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
717                                                                 // we are in an array, so just push an element onto the stack
718                                                                 array_push($arr, $this->decode($slice));
719
720                                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
721                                                                 // we are in an object, so figure
722                                                                 // out the property name and set an
723                                                                 // element in an associative array,
724                                                                 // for now
725                                                                 $parts = array();
726
727                                                                 if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
728                                                                         // "name":value pair
729                                                                         $key = $this->decode($parts[1]);
730                                                                         $val = $this->decode($parts[2]);
731
732                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
733                                                                                 $obj[$key] = $val;
734                                                                         } else {
735                                                                                 $obj->$key = $val;
736                                                                         }
737                                                                 } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
738                                                                         // name:value pair, where name is unquoted
739                                                                         $key = $parts[1];
740                                                                         $val = $this->decode($parts[2]);
741
742                                                                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
743                                                                                 $obj[$key] = $val;
744                                                                         } else {
745                                                                                 $obj->$key = $val;
746                                                                         }
747                                                                 }
748
749                                                         }
750
751                                                 } elseif ((($chrs[$c] == '"') || ($chrs[$c] == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
752                                                         // found a quote, and we are not inside a string
753                                                         array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs[$c]));
754                                                         //print("Found start of string at {$c}\n");
755
756                                                 } elseif (($chrs[$c] == $top['delim']) &&
757                                                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
758                                                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
759                                                         // found a quote, we're in a string, and it's not escaped
760                                                         // we know that it's not escaped becase there is _not_ an
761                                                         // odd number of backslashes at the end of the string so far
762                                                         array_pop($stk);
763                                                         //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
764
765                                                 } elseif (($chrs[$c] == '[') &&
766                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
767                                                         // found a left-bracket, and we are in an array, object, or slice
768                                                         array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
769                                                         //print("Found start of array at {$c}\n");
770
771                                                 } elseif (($chrs[$c] == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
772                                                         // found a right-bracket, and we're in an array
773                                                         array_pop($stk);
774                                                         //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
775
776                                                 } elseif (($chrs[$c] == '{') &&
777                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
778                                                         // found a left-brace, and we are in an array, object, or slice
779                                                         array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
780                                                         //print("Found start of object at {$c}\n");
781
782                                                 } elseif (($chrs[$c] == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
783                                                         // found a right-brace, and we're in an object
784                                                         array_pop($stk);
785                                                         //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
786
787                                                 } elseif (($substr_chrs_c_2 == '/*') &&
788                                                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
789                                                         // found a comment start, and we are in an array, object, or slice
790                                                         array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
791                                                         $c++;
792                                                         //print("Found start of comment at {$c}\n");
793
794                                                 } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
795                                                         // found a comment end, and we're in one now
796                                                         array_pop($stk);
797                                                         $c++;
798
799                                                         for ($i = $top['where']; $i <= $c; ++$i)
800                                                                 $chrs = substr_replace($chrs, ' ', $i, 1);
801
802                                                         //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
803
804                                                 }
805
806                                         }
807
808                                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
809                                                 return $arr;
810
811                                         } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
812                                                 return $obj;
813
814                                         }
815
816                                 }
817                 }
818         }
819
820         /**
821         * @todo Ultimately, this should just call PEAR::isError()
822         */
823         function isError($data, $code = null)
824         {
825                 if (class_exists('pear')) {
826                         return PEAR::isError($data, $code);
827                 } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
828                                                                 is_subclass_of($data, 'services_json_error'))) {
829                         return true;
830                 }
831
832                 return false;
833         }
834 }
835
836 if (class_exists('PEAR_Error')) {
837
838         class Services_JSON_Error extends PEAR_Error
839         {
840                 function Services_JSON_Error($message = 'unknown error', $code = null,
841                                                                         $mode = null, $options = null, $userinfo = null)
842                 {
843                         parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
844                 }
845         }
846
847 } else {
848
849         /**
850         * @todo Ultimately, this class shall be descended from PEAR_Error
851         */
852         class Services_JSON_Error
853         {
854                 function Services_JSON_Error($message = 'unknown error', $code = null,
855                                                                         $mode = null, $options = null, $userinfo = null)
856                 {
857
858                 }
859         }
860
861 }
862 endif;