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/www/wp-includes/class-json.php

https://github.com/mikeonthebike/gitwordpress
PHP | 936 lines | 511 code | 124 blank | 301 comment | 104 complexity | 4cf25341919f07dacd84ace1dc05251a MD5 | raw file
  1<?php
  2if ( ! class_exists( 'Services_JSON' ) ) :
  3/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
  4/**
  5 * Converts to and from JSON format.
  6 *
  7 * JSON (JavaScript Object Notation) is a lightweight data-interchange
  8 * format. It is easy for humans to read and write. It is easy for machines
  9 * to parse and generate. It is based on a subset of the JavaScript
 10 * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
 11 * This feature can also be found in  Python. JSON is a text format that is
 12 * completely language independent but uses conventions that are familiar
 13 * to programmers of the C-family of languages, including C, C++, C#, Java,
 14 * JavaScript, Perl, TCL, and many others. These properties make JSON an
 15 * ideal data-interchange language.
 16 *
 17 * This package provides a simple encoder and decoder for JSON notation. It
 18 * is intended for use with client-side Javascript applications that make
 19 * use of HTTPRequest to perform server communication functions - data can
 20 * be encoded into JSON notation for use in a client-side javascript, or
 21 * decoded from incoming Javascript requests. JSON format is native to
 22 * Javascript, and can be directly eval()'ed with no further parsing
 23 * overhead
 24 *
 25 * All strings should be in ASCII or UTF-8 format!
 26 *
 27 * LICENSE: Redistribution and use in source and binary forms, with or
 28 * without modification, are permitted provided that the following
 29 * conditions are met: Redistributions of source code must retain the
 30 * above copyright notice, this list of conditions and the following
 31 * disclaimer. Redistributions in binary form must reproduce the above
 32 * copyright notice, this list of conditions and the following disclaimer
 33 * in the documentation and/or other materials provided with the
 34 * distribution.
 35 *
 36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 38 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 39 * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 40 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 41 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 42 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 44 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 45 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 46 * DAMAGE.
 47 *
 48 * @category
 49 * @package     Services_JSON
 50 * @author      Michal Migurski <mike-json@teczno.com>
 51 * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
 52 * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
 53 * @copyright   2005 Michal Migurski
 54 * @version     CVS: $Id: JSON.php 305040 2010-11-02 23:19:03Z alan_k $
 55 * @license     http://www.opensource.org/licenses/bsd-license.php
 56 * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
 57 */
 58
 59/**
 60 * Marker constant for Services_JSON::decode(), used to flag stack state
 61 */
 62define('SERVICES_JSON_SLICE',   1);
 63
 64/**
 65 * Marker constant for Services_JSON::decode(), used to flag stack state
 66 */
 67define('SERVICES_JSON_IN_STR',  2);
 68
 69/**
 70 * Marker constant for Services_JSON::decode(), used to flag stack state
 71 */
 72define('SERVICES_JSON_IN_ARR',  3);
 73
 74/**
 75 * Marker constant for Services_JSON::decode(), used to flag stack state
 76 */
 77define('SERVICES_JSON_IN_OBJ',  4);
 78
 79/**
 80 * Marker constant for Services_JSON::decode(), used to flag stack state
 81 */
 82define('SERVICES_JSON_IN_CMT', 5);
 83
 84/**
 85 * Behavior switch for Services_JSON::decode()
 86 */
 87define('SERVICES_JSON_LOOSE_TYPE', 16);
 88
 89/**
 90 * Behavior switch for Services_JSON::decode()
 91 */
 92define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
 93
 94/**
 95 * Behavior switch for Services_JSON::decode()
 96 */
 97define('SERVICES_JSON_USE_TO_JSON', 64);
 98
 99/**
100 * Converts to and from JSON format.
101 *
102 * Brief example of use:
103 *
104 * <code>
105 * // create a new instance of Services_JSON
106 * $json = new Services_JSON();
107 *
108 * // convert a complexe value to JSON notation, and send it to the browser
109 * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
110 * $output = $json->encode($value);
111 *
112 * print($output);
113 * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
114 *
115 * // accept incoming POST data, assumed to be in JSON notation
116 * $input = file_get_contents('php://input', 1000000);
117 * $value = $json->decode($input);
118 * </code>
119 */
120class Services_JSON
121{
122   /**
123    * constructs a new JSON instance
124    *
125    * @param    int     $use    object behavior flags; combine with boolean-OR
126    *
127    *                           possible values:
128    *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
129    *                                   "{...}" syntax creates associative arrays
130    *                                   instead of objects in decode().
131    *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
132    *                                   Values which can't be encoded (e.g. resources)
133    *                                   appear as NULL instead of throwing errors.
134    *                                   By default, a deeply-nested resource will
135    *                                   bubble up with an error, so all return values
136    *                                   from encode() should be checked with isError()
137    *                           - SERVICES_JSON_USE_TO_JSON:  call toJSON when serializing objects
138    *                                   It serializes the return value from the toJSON call rather 
139    *                                   than the object it'self,  toJSON can return associative arrays, 
140    *                                   strings or numbers, if you return an object, make sure it does
141    *                                   not have a toJSON method, otherwise an error will occur.
142    */
143    function Services_JSON($use = 0)
144    {
145        $this->use = $use;
146        $this->_mb_strlen            = function_exists('mb_strlen');
147        $this->_mb_convert_encoding  = function_exists('mb_convert_encoding');
148        $this->_mb_substr            = function_exists('mb_substr');
149    }
150    // private - cache the mbstring lookup results..
151    var $_mb_strlen = false;
152    var $_mb_substr = false;
153    var $_mb_convert_encoding = false;
154    
155   /**
156    * convert a string from one UTF-16 char to one UTF-8 char
157    *
158    * Normally should be handled by mb_convert_encoding, but
159    * provides a slower PHP-only method for installations
160    * that lack the multibye string extension.
161    *
162    * @param    string  $utf16  UTF-16 character
163    * @return   string  UTF-8 character
164    * @access   private
165    */
166    function utf162utf8($utf16)
167    {
168        // oh please oh please oh please oh please oh please
169        if($this->_mb_convert_encoding) {
170            return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
171        }
172
173        $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
174
175        switch(true) {
176            case ((0x7F & $bytes) == $bytes):
177                // this case should never be reached, because we are in ASCII range
178                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
179                return chr(0x7F & $bytes);
180
181            case (0x07FF & $bytes) == $bytes:
182                // return a 2-byte UTF-8 character
183                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
184                return chr(0xC0 | (($bytes >> 6) & 0x1F))
185                     . chr(0x80 | ($bytes & 0x3F));
186
187            case (0xFFFF & $bytes) == $bytes:
188                // return a 3-byte UTF-8 character
189                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
190                return chr(0xE0 | (($bytes >> 12) & 0x0F))
191                     . chr(0x80 | (($bytes >> 6) & 0x3F))
192                     . chr(0x80 | ($bytes & 0x3F));
193        }
194
195        // ignoring UTF-32 for now, sorry
196        return '';
197    }
198
199   /**
200    * convert a string from one UTF-8 char to one UTF-16 char
201    *
202    * Normally should be handled by mb_convert_encoding, but
203    * provides a slower PHP-only method for installations
204    * that lack the multibye string extension.
205    *
206    * @param    string  $utf8   UTF-8 character
207    * @return   string  UTF-16 character
208    * @access   private
209    */
210    function utf82utf16($utf8)
211    {
212        // oh please oh please oh please oh please oh please
213        if($this->_mb_convert_encoding) {
214            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
215        }
216
217        switch($this->strlen8($utf8)) {
218            case 1:
219                // this case should never be reached, because we are in ASCII range
220                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
221                return $utf8;
222
223            case 2:
224                // return a UTF-16 character from a 2-byte UTF-8 char
225                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
226                return chr(0x07 & (ord($utf8{0}) >> 2))
227                     . chr((0xC0 & (ord($utf8{0}) << 6))
228                         | (0x3F & ord($utf8{1})));
229
230            case 3:
231                // return a UTF-16 character from a 3-byte UTF-8 char
232                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
233                return chr((0xF0 & (ord($utf8{0}) << 4))
234                         | (0x0F & (ord($utf8{1}) >> 2)))
235                     . chr((0xC0 & (ord($utf8{1}) << 6))
236                         | (0x7F & ord($utf8{2})));
237        }
238
239        // ignoring UTF-32 for now, sorry
240        return '';
241    }
242
243   /**
244    * encodes an arbitrary variable into JSON format (and sends JSON Header)
245    *
246    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
247    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
248    *                           if var is a strng, note that encode() always expects it
249    *                           to be in ASCII or UTF-8 format!
250    *
251    * @return   mixed   JSON string representation of input var or an error if a problem occurs
252    * @access   public
253    */
254    function encode($var)
255    {
256        header('Content-type: application/json');
257        return $this->encodeUnsafe($var);
258    }
259    /**
260    * encodes an arbitrary variable into JSON format without JSON Header - warning - may allow XSS!!!!)
261    *
262    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
263    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
264    *                           if var is a strng, note that encode() always expects it
265    *                           to be in ASCII or UTF-8 format!
266    *
267    * @return   mixed   JSON string representation of input var or an error if a problem occurs
268    * @access   public
269    */
270    function encodeUnsafe($var)
271    {
272        // see bug #16908 - regarding numeric locale printing
273        $lc = setlocale(LC_NUMERIC, 0);
274        setlocale(LC_NUMERIC, 'C');
275        $ret = $this->_encode($var);
276        setlocale(LC_NUMERIC, $lc);
277        return $ret;
278        
279    }
280    /**
281    * PRIVATE CODE that does the work of encodes an arbitrary variable into JSON format 
282    *
283    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
284    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
285    *                           if var is a strng, note that encode() always expects it
286    *                           to be in ASCII or UTF-8 format!
287    *
288    * @return   mixed   JSON string representation of input var or an error if a problem occurs
289    * @access   public
290    */
291    function _encode($var) 
292    {
293         
294        switch (gettype($var)) {
295            case 'boolean':
296                return $var ? 'true' : 'false';
297
298            case 'NULL':
299                return 'null';
300
301            case 'integer':
302                return (int) $var;
303
304            case 'double':
305            case 'float':
306                return  (float) $var;
307
308            case 'string':
309                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
310                $ascii = '';
311                $strlen_var = $this->strlen8($var);
312
313               /*
314                * Iterate over every character in the string,
315                * escaping with a slash or encoding to UTF-8 where necessary
316                */
317                for ($c = 0; $c < $strlen_var; ++$c) {
318
319                    $ord_var_c = ord($var{$c});
320
321                    switch (true) {
322                        case $ord_var_c == 0x08:
323                            $ascii .= '\b';
324                            break;
325                        case $ord_var_c == 0x09:
326                            $ascii .= '\t';
327                            break;
328                        case $ord_var_c == 0x0A:
329                            $ascii .= '\n';
330                            break;
331                        case $ord_var_c == 0x0C:
332                            $ascii .= '\f';
333                            break;
334                        case $ord_var_c == 0x0D:
335                            $ascii .= '\r';
336                            break;
337
338                        case $ord_var_c == 0x22:
339                        case $ord_var_c == 0x2F:
340                        case $ord_var_c == 0x5C:
341                            // double quote, slash, slosh
342                            $ascii .= '\\'.$var{$c};
343                            break;
344
345                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
346                            // characters U-00000000 - U-0000007F (same as ASCII)
347                            $ascii .= $var{$c};
348                            break;
349
350                        case (($ord_var_c & 0xE0) == 0xC0):
351                            // characters U-00000080 - U-000007FF, mask 110XXXXX
352                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
353                            if ($c+1 >= $strlen_var) {
354                                $c += 1;
355                                $ascii .= '?';
356                                break;
357                            }
358                            
359                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
360                            $c += 1;
361                            $utf16 = $this->utf82utf16($char);
362                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
363                            break;
364
365                        case (($ord_var_c & 0xF0) == 0xE0):
366                            if ($c+2 >= $strlen_var) {
367                                $c += 2;
368                                $ascii .= '?';
369                                break;
370                            }
371                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
372                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
373                            $char = pack('C*', $ord_var_c,
374                                         @ord($var{$c + 1}),
375                                         @ord($var{$c + 2}));
376                            $c += 2;
377                            $utf16 = $this->utf82utf16($char);
378                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
379                            break;
380
381                        case (($ord_var_c & 0xF8) == 0xF0):
382                            if ($c+3 >= $strlen_var) {
383                                $c += 3;
384                                $ascii .= '?';
385                                break;
386                            }
387                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
388                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
389                            $char = pack('C*', $ord_var_c,
390                                         ord($var{$c + 1}),
391                                         ord($var{$c + 2}),
392                                         ord($var{$c + 3}));
393                            $c += 3;
394                            $utf16 = $this->utf82utf16($char);
395                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
396                            break;
397
398                        case (($ord_var_c & 0xFC) == 0xF8):
399                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
400                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
401                            if ($c+4 >= $strlen_var) {
402                                $c += 4;
403                                $ascii .= '?';
404                                break;
405                            }
406                            $char = pack('C*', $ord_var_c,
407                                         ord($var{$c + 1}),
408                                         ord($var{$c + 2}),
409                                         ord($var{$c + 3}),
410                                         ord($var{$c + 4}));
411                            $c += 4;
412                            $utf16 = $this->utf82utf16($char);
413                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
414                            break;
415
416                        case (($ord_var_c & 0xFE) == 0xFC):
417                        if ($c+5 >= $strlen_var) {
418                                $c += 5;
419                                $ascii .= '?';
420                                break;
421                            }
422                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
423                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
424                            $char = pack('C*', $ord_var_c,
425                                         ord($var{$c + 1}),
426                                         ord($var{$c + 2}),
427                                         ord($var{$c + 3}),
428                                         ord($var{$c + 4}),
429                                         ord($var{$c + 5}));
430                            $c += 5;
431                            $utf16 = $this->utf82utf16($char);
432                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
433                            break;
434                    }
435                }
436                return  '"'.$ascii.'"';
437
438            case 'array':
439               /*
440                * As per JSON spec if any array key is not an integer
441                * we must treat the the whole array as an object. We
442                * also try to catch a sparsely populated associative
443                * array with numeric keys here because some JS engines
444                * will create an array with empty indexes up to
445                * max_index which can cause memory issues and because
446                * the keys, which may be relevant, will be remapped
447                * otherwise.
448                *
449                * As per the ECMA and JSON specification an object may
450                * have any string as a property. Unfortunately due to
451                * a hole in the ECMA specification if the key is a
452                * ECMA reserved word or starts with a digit the
453                * parameter is only accessible using ECMAScript's
454                * bracket notation.
455                */
456
457                // treat as a JSON object
458                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
459                    $properties = array_map(array($this, 'name_value'),
460                                            array_keys($var),
461                                            array_values($var));
462
463                    foreach($properties as $property) {
464                        if(Services_JSON::isError($property)) {
465                            return $property;
466                        }
467                    }
468
469                    return '{' . join(',', $properties) . '}';
470                }
471
472                // treat it like a regular array
473                $elements = array_map(array($this, '_encode'), $var);
474
475                foreach($elements as $element) {
476                    if(Services_JSON::isError($element)) {
477                        return $element;
478                    }
479                }
480
481                return '[' . join(',', $elements) . ']';
482
483            case 'object':
484            
485                // support toJSON methods.
486                if (($this->use & SERVICES_JSON_USE_TO_JSON) && method_exists($var, 'toJSON')) {
487                    // this may end up allowing unlimited recursion
488                    // so we check the return value to make sure it's not got the same method.
489                    $recode = $var->toJSON();
490                    
491                    if (method_exists($recode, 'toJSON')) {
492                        
493                        return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
494                        ? 'null'
495                        : new Services_JSON_Error(get_class($var).
496                            " toJSON returned an object with a toJSON method.");
497                            
498                    }
499                    
500                    return $this->_encode( $recode );
501                } 
502                
503                $vars = get_object_vars($var);
504                
505                $properties = array_map(array($this, 'name_value'),
506                                        array_keys($vars),
507                                        array_values($vars));
508
509                foreach($properties as $property) {
510                    if(Services_JSON::isError($property)) {
511                        return $property;
512                    }
513                }
514
515                return '{' . join(',', $properties) . '}';
516
517            default:
518                return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
519                    ? 'null'
520                    : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
521        }
522    }
523
524   /**
525    * array-walking function for use in generating JSON-formatted name-value pairs
526    *
527    * @param    string  $name   name of key to use
528    * @param    mixed   $value  reference to an array element to be encoded
529    *
530    * @return   string  JSON-formatted name-value pair, like '"name":value'
531    * @access   private
532    */
533    function name_value($name, $value)
534    {
535        $encoded_value = $this->_encode($value);
536
537        if(Services_JSON::isError($encoded_value)) {
538            return $encoded_value;
539        }
540
541        return $this->_encode(strval($name)) . ':' . $encoded_value;
542    }
543
544   /**
545    * reduce a string by removing leading and trailing comments and whitespace
546    *
547    * @param    $str    string      string value to strip of comments and whitespace
548    *
549    * @return   string  string value stripped of comments and whitespace
550    * @access   private
551    */
552    function reduce_string($str)
553    {
554        $str = preg_replace(array(
555
556                // eliminate single line comments in '// ...' form
557                '#^\s*//(.+)$#m',
558
559                // eliminate multi-line comments in '/* ... */' form, at start of string
560                '#^\s*/\*(.+)\*/#Us',
561
562                // eliminate multi-line comments in '/* ... */' form, at end of string
563                '#/\*(.+)\*/\s*$#Us'
564
565            ), '', $str);
566
567        // eliminate extraneous space
568        return trim($str);
569    }
570
571   /**
572    * decodes a JSON string into appropriate variable
573    *
574    * @param    string  $str    JSON-formatted string
575    *
576    * @return   mixed   number, boolean, string, array, or object
577    *                   corresponding to given JSON input string.
578    *                   See argument 1 to Services_JSON() above for object-output behavior.
579    *                   Note that decode() always returns strings
580    *                   in ASCII or UTF-8 format!
581    * @access   public
582    */
583    function decode($str)
584    {
585        $str = $this->reduce_string($str);
586
587        switch (strtolower($str)) {
588            case 'true':
589                return true;
590
591            case 'false':
592                return false;
593
594            case 'null':
595                return null;
596
597            default:
598                $m = array();
599
600                if (is_numeric($str)) {
601                    // Lookie-loo, it's a number
602
603                    // This would work on its own, but I'm trying to be
604                    // good about returning integers where appropriate:
605                    // return (float)$str;
606
607                    // Return float or int, as appropriate
608                    return ((float)$str == (integer)$str)
609                        ? (integer)$str
610                        : (float)$str;
611
612                } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
613                    // STRINGS RETURNED IN UTF-8 FORMAT
614                    $delim = $this->substr8($str, 0, 1);
615                    $chrs = $this->substr8($str, 1, -1);
616                    $utf8 = '';
617                    $strlen_chrs = $this->strlen8($chrs);
618
619                    for ($c = 0; $c < $strlen_chrs; ++$c) {
620
621                        $substr_chrs_c_2 = $this->substr8($chrs, $c, 2);
622                        $ord_chrs_c = ord($chrs{$c});
623
624                        switch (true) {
625                            case $substr_chrs_c_2 == '\b':
626                                $utf8 .= chr(0x08);
627                                ++$c;
628                                break;
629                            case $substr_chrs_c_2 == '\t':
630                                $utf8 .= chr(0x09);
631                                ++$c;
632                                break;
633                            case $substr_chrs_c_2 == '\n':
634                                $utf8 .= chr(0x0A);
635                                ++$c;
636                                break;
637                            case $substr_chrs_c_2 == '\f':
638                                $utf8 .= chr(0x0C);
639                                ++$c;
640                                break;
641                            case $substr_chrs_c_2 == '\r':
642                                $utf8 .= chr(0x0D);
643                                ++$c;
644                                break;
645
646                            case $substr_chrs_c_2 == '\\"':
647                            case $substr_chrs_c_2 == '\\\'':
648                            case $substr_chrs_c_2 == '\\\\':
649                            case $substr_chrs_c_2 == '\\/':
650                                if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
651                                   ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
652                                    $utf8 .= $chrs{++$c};
653                                }
654                                break;
655
656                            case preg_match('/\\\u[0-9A-F]{4}/i', $this->substr8($chrs, $c, 6)):
657                                // single, escaped unicode character
658                                $utf16 = chr(hexdec($this->substr8($chrs, ($c + 2), 2)))
659                                       . chr(hexdec($this->substr8($chrs, ($c + 4), 2)));
660                                $utf8 .= $this->utf162utf8($utf16);
661                                $c += 5;
662                                break;
663
664                            case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
665                                $utf8 .= $chrs{$c};
666                                break;
667
668                            case ($ord_chrs_c & 0xE0) == 0xC0:
669                                // characters U-00000080 - U-000007FF, mask 110XXXXX
670                                //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
671                                $utf8 .= $this->substr8($chrs, $c, 2);
672                                ++$c;
673                                break;
674
675                            case ($ord_chrs_c & 0xF0) == 0xE0:
676                                // characters U-00000800 - U-0000FFFF, mask 1110XXXX
677                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
678                                $utf8 .= $this->substr8($chrs, $c, 3);
679                                $c += 2;
680                                break;
681
682                            case ($ord_chrs_c & 0xF8) == 0xF0:
683                                // characters U-00010000 - U-001FFFFF, mask 11110XXX
684                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
685                                $utf8 .= $this->substr8($chrs, $c, 4);
686                                $c += 3;
687                                break;
688
689                            case ($ord_chrs_c & 0xFC) == 0xF8:
690                                // characters U-00200000 - U-03FFFFFF, mask 111110XX
691                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
692                                $utf8 .= $this->substr8($chrs, $c, 5);
693                                $c += 4;
694                                break;
695
696                            case ($ord_chrs_c & 0xFE) == 0xFC:
697                                // characters U-04000000 - U-7FFFFFFF, mask 1111110X
698                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
699                                $utf8 .= $this->substr8($chrs, $c, 6);
700                                $c += 5;
701                                break;
702
703                        }
704
705                    }
706
707                    return $utf8;
708
709                } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
710                    // array, or object notation
711
712                    if ($str{0} == '[') {
713                        $stk = array(SERVICES_JSON_IN_ARR);
714                        $arr = array();
715                    } else {
716                        if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
717                            $stk = array(SERVICES_JSON_IN_OBJ);
718                            $obj = array();
719                        } else {
720                            $stk = array(SERVICES_JSON_IN_OBJ);
721                            $obj = new stdClass();
722                        }
723                    }
724
725                    array_push($stk, array('what'  => SERVICES_JSON_SLICE,
726                                           'where' => 0,
727                                           'delim' => false));
728
729                    $chrs = $this->substr8($str, 1, -1);
730                    $chrs = $this->reduce_string($chrs);
731
732                    if ($chrs == '') {
733                        if (reset($stk) == SERVICES_JSON_IN_ARR) {
734                            return $arr;
735
736                        } else {
737                            return $obj;
738
739                        }
740                    }
741
742                    //print("\nparsing {$chrs}\n");
743
744                    $strlen_chrs = $this->strlen8($chrs);
745
746                    for ($c = 0; $c <= $strlen_chrs; ++$c) {
747
748                        $top = end($stk);
749                        $substr_chrs_c_2 = $this->substr8($chrs, $c, 2);
750
751                        if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
752                            // found a comma that is not inside a string, array, etc.,
753                            // OR we've reached the end of the character list
754                            $slice = $this->substr8($chrs, $top['where'], ($c - $top['where']));
755                            array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
756                            //print("Found split at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
757
758                            if (reset($stk) == SERVICES_JSON_IN_ARR) {
759                                // we are in an array, so just push an element onto the stack
760                                array_push($arr, $this->decode($slice));
761
762                            } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
763                                // we are in an object, so figure
764                                // out the property name and set an
765                                // element in an associative array,
766                                // for now
767                                $parts = array();
768                                
769                               if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:/Uis', $slice, $parts)) {
770 	                              // "name":value pair
771                                    $key = $this->decode($parts[1]);
772                                    $val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));
773                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
774                                        $obj[$key] = $val;
775                                    } else {
776                                        $obj->$key = $val;
777                                    }
778                                } elseif (preg_match('/^\s*(\w+)\s*:/Uis', $slice, $parts)) {
779                                    // name:value pair, where name is unquoted
780                                    $key = $parts[1];
781                                    $val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));
782
783                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
784                                        $obj[$key] = $val;
785                                    } else {
786                                        $obj->$key = $val;
787                                    }
788                                }
789
790                            }
791
792                        } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
793                            // found a quote, and we are not inside a string
794                            array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
795                            //print("Found start of string at {$c}\n");
796
797                        } elseif (($chrs{$c} == $top['delim']) &&
798                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
799                                 (($this->strlen8($this->substr8($chrs, 0, $c)) - $this->strlen8(rtrim($this->substr8($chrs, 0, $c), '\\'))) % 2 != 1)) {
800                            // found a quote, we're in a string, and it's not escaped
801                            // we know that it's not escaped becase there is _not_ an
802                            // odd number of backslashes at the end of the string so far
803                            array_pop($stk);
804                            //print("Found end of string at {$c}: ".$this->substr8($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
805
806                        } elseif (($chrs{$c} == '[') &&
807                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
808                            // found a left-bracket, and we are in an array, object, or slice
809                            array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
810                            //print("Found start of array at {$c}\n");
811
812                        } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
813                            // found a right-bracket, and we're in an array
814                            array_pop($stk);
815                            //print("Found end of array at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
816
817                        } elseif (($chrs{$c} == '{') &&
818                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
819                            // found a left-brace, and we are in an array, object, or slice
820                            array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
821                            //print("Found start of object at {$c}\n");
822
823                        } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
824                            // found a right-brace, and we're in an object
825                            array_pop($stk);
826                            //print("Found end of object at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
827
828                        } elseif (($substr_chrs_c_2 == '/*') &&
829                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
830                            // found a comment start, and we are in an array, object, or slice
831                            array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
832                            $c++;
833                            //print("Found start of comment at {$c}\n");
834
835                        } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
836                            // found a comment end, and we're in one now
837                            array_pop($stk);
838                            $c++;
839
840                            for ($i = $top['where']; $i <= $c; ++$i)
841                                $chrs = substr_replace($chrs, ' ', $i, 1);
842
843                            //print("Found end of comment at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");
844
845                        }
846
847                    }
848
849                    if (reset($stk) == SERVICES_JSON_IN_ARR) {
850                        return $arr;
851
852                    } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
853                        return $obj;
854
855                    }
856
857                }
858        }
859    }
860
861    /**
862     * @todo Ultimately, this should just call PEAR::isError()
863     */
864    function isError($data, $code = null)
865    {
866        if (class_exists('pear')) {
867            return PEAR::isError($data, $code);
868        } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
869                                 is_subclass_of($data, 'services_json_error'))) {
870            return true;
871        }
872
873        return false;
874    }
875    
876    /**
877    * Calculates length of string in bytes
878    * @param string 
879    * @return integer length
880    */
881    function strlen8( $str ) 
882    {
883        if ( $this->_mb_strlen ) {
884            return mb_strlen( $str, "8bit" );
885        }
886        return strlen( $str );
887    }
888    
889    /**
890    * Returns part of a string, interpreting $start and $length as number of bytes.
891    * @param string 
892    * @param integer start 
893    * @param integer length 
894    * @return integer length
895    */
896    function substr8( $string, $start, $length=false ) 
897    {
898        if ( $length === false ) {
899            $length = $this->strlen8( $string ) - $start;
900        }
901        if ( $this->_mb_substr ) {
902            return mb_substr( $string, $start, $length, "8bit" );
903        }
904        return substr( $string, $start, $length );
905    }
906
907}
908
909if (class_exists('PEAR_Error')) {
910
911    class Services_JSON_Error extends PEAR_Error
912    {
913        function Services_JSON_Error($message = 'unknown error', $code = null,
914                                     $mode = null, $options = null, $userinfo = null)
915        {
916            parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
917        }
918    }
919
920} else {
921
922    /**
923     * @todo Ultimately, this class shall be descended from PEAR_Error
924     */
925    class Services_JSON_Error
926    {
927        function Services_JSON_Error($message = 'unknown error', $code = null,
928                                     $mode = null, $options = null, $userinfo = null)
929        {
930
931        }
932    }
933    
934}
935
936endif;