<?php
/**
 * @version		$Id: JSON.php 1812 2013-01-14 18:45:06Z lefteris.kavadas $
 * @package		K2
 * @author		JoomlaWorks http://www.joomlaworks.net
 * @copyright	Copyright (c) 2006 - 2013 JoomlaWorks Ltd. All rights reserved.
 * @license		GNU/GPL license: http://www.gnu.org/copyleft/gpl.html
 */

// no direct access
defined('_JEXEC') or die;

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Converts to and from JSON format.
 *
 * JSON (JavaScript Object Notation) is a lightweight data-interchange
 * format. It is easy for humans to read and write. It is easy for machines
 * to parse and generate. It is based on a subset of the JavaScript
 * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
 * This feature can also be found in  Python. JSON is a text format that is
 * completely language independent but uses conventions that are familiar
 * to programmers of the C-family of languages, including C, C++, C#, Java,
 * JavaScript, Perl, TCL, and many others. These properties make JSON an
 * ideal data-interchange language.
 *
 * This package provides a simple encoder and decoder for JSON notation. It
 * is intended for use with client-side Javascript applications that make
 * use of HTTPRequest to perform server communication functions - data can
 * be encoded into JSON notation for use in a client-side javascript, or
 * decoded from incoming Javascript requests. JSON format is native to
 * Javascript, and can be directly eval()'ed with no further parsing
 * overhead
 *
 * All strings should be in ASCII or UTF-8 format!
 *
 * LICENSE: Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met: Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following
 * disclaimer. Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * @category
 * @package     Services_JSON
 * @author      Michal Migurski <mike-json@teczno.com>
 * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
 * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
 * @copyright   2005 Michal Migurski
 * @version     CVS: $Id: JSON.php 1812 2013-01-14 18:45:06Z lefteris.kavadas $
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
 */

/**
 * Marker constant for Services_JSON::decode(), used to flag stack state
 */
if(!defined('SERVICES_JSON_SLICE')) define('SERVICES_JSON_SLICE', 1);

/**
 * Marker constant for Services_JSON::decode(), used to flag stack state
 */
if(!defined('SERVICES_JSON_IN_STR')) define('SERVICES_JSON_IN_STR', 2);

/**
 * Marker constant for Services_JSON::decode(), used to flag stack state
 */
if(!defined('SERVICES_JSON_IN_ARR')) define('SERVICES_JSON_IN_ARR', 3);

/**
 * Marker constant for Services_JSON::decode(), used to flag stack state
 */
if(!defined('SERVICES_JSON_IN_OBJ')) define('SERVICES_JSON_IN_OBJ', 4);

/**
 * Marker constant for Services_JSON::decode(), used to flag stack state
 */
if(!defined('SERVICES_JSON_IN_CMT')) define('SERVICES_JSON_IN_CMT', 5);

/**
 * Behavior switch for Services_JSON::decode()
 */
if(!defined('SERVICES_JSON_LOOSE_TYPE')) define('SERVICES_JSON_LOOSE_TYPE', 16);

/**
 * Behavior switch for Services_JSON::decode()
 */
if(!defined('SERVICES_JSON_SUPPRESS_ERRORS')) define('SERVICES_JSON_SUPPRESS_ERRORS', 32);

/**
 * Converts to and from JSON format.
 *
 * Brief example of use:
 *
 * <code>
 * // create a new instance of Services_JSON
 * $json = new Services_JSON();
 *
 * // convert a complexe value to JSON notation, and send it to the browser
 * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
 * $output = $json->encode($value);
 *
 * print($output);
 * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
 *
 * // accept incoming POST data, assumed to be in JSON notation
 * $input = file_get_contents('php://input', 1000000);
 * $value = $json->decode($input);
 * </code>
 */
if(!class_exists('Services_JSON')){
	class Services_JSON
	{
	   /**
	    * constructs a new JSON instance
	    *
	    * @param    int     $use    object behavior flags; combine with boolean-OR
	    *
	    *                           possible values:
	    *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
	    *                                   "{...}" syntax creates associative arrays
	    *                                   instead of objects in decode().
	    *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
	    *                                   Values which can't be encoded (e.g. resources)
	    *                                   appear as NULL instead of throwing errors.
	    *                                   By default, a deeply-nested resource will
	    *                                   bubble up with an error, so all return values
	    *                                   from encode() should be checked with isError()
	    */
	    function Services_JSON($use = 0)
	    {
	        $this->use = $use;
	    }
	
	   /**
	    * convert a string from one UTF-16 char to one UTF-8 char
	    *
	    * Normally should be handled by mb_convert_encoding, but
	    * provides a slower PHP-only method for installations
	    * that lack the multibye string extension.
	    *
	    * @param    string  $utf16  UTF-16 character
	    * @return   string  UTF-8 character
	    * @access   private
	    */
	    function utf162utf8($utf16)
	    {
	        // oh please oh please oh please oh please oh please
	        if(function_exists('mb_convert_encoding')) {
	            return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
	        }
	
	        $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
	
	        switch(true) {
	            case ((0x7F & $bytes) == $bytes):
	                // this case should never be reached, because we are in ASCII range
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0x7F & $bytes);
	
	            case (0x07FF & $bytes) == $bytes:
	                // return a 2-byte UTF-8 character
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0xC0 | (($bytes >> 6) & 0x1F))
	                     . chr(0x80 | ($bytes & 0x3F));
	
	            case (0xFFFF & $bytes) == $bytes:
	                // return a 3-byte UTF-8 character
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0xE0 | (($bytes >> 12) & 0x0F))
	                     . chr(0x80 | (($bytes >> 6) & 0x3F))
	                     . chr(0x80 | ($bytes & 0x3F));
	        }
	
	        // ignoring UTF-32 for now, sorry
	        return '';
	    }
	
	   /**
	    * convert a string from one UTF-8 char to one UTF-16 char
	    *
	    * Normally should be handled by mb_convert_encoding, but
	    * provides a slower PHP-only method for installations
	    * that lack the multibye string extension.
	    *
	    * @param    string  $utf8   UTF-8 character
	    * @return   string  UTF-16 character
	    * @access   private
	    */
	    function utf82utf16($utf8)
	    {
	        // oh please oh please oh please oh please oh please
	        if(function_exists('mb_convert_encoding')) {
	            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
	        }
	
	        switch(strlen($utf8)) {
	            case 1:
	                // this case should never be reached, because we are in ASCII range
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return $utf8;
	
	            case 2:
	                // return a UTF-16 character from a 2-byte UTF-8 char
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0x07 & (ord($utf8{0}) >> 2))
	                     . chr((0xC0 & (ord($utf8{0}) << 6))
	                         | (0x3F & ord($utf8{1})));
	
	            case 3:
	                // return a UTF-16 character from a 3-byte UTF-8 char
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr((0xF0 & (ord($utf8{0}) << 4))
	                         | (0x0F & (ord($utf8{1}) >> 2)))
	                     . chr((0xC0 & (ord($utf8{1}) << 6))
	                         | (0x7F & ord($utf8{2})));
	        }
	
	        // ignoring UTF-32 for now, sorry
	        return '';
	    }
	
	   /**
	    * encodes an arbitrary variable into JSON format
	    *
	    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
	    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
	    *                           if var is a strng, note that encode() always expects it
	    *                           to be in ASCII or UTF-8 format!
	    *
	    * @return   mixed   JSON string representation of input var or an error if a problem occurs
	    * @access   public
	    */
	    function encode($var)
	    {
	        switch (gettype($var)) {
	            case 'boolean':
	                return $var ? 'true' : 'false';
	
	            case 'NULL':
	                return 'null';
	
	            case 'integer':
	                return (int) $var;
	
	            case 'double':
	            case 'float':
	                return (float) $var;
	
	            case 'string':
	                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
	                $ascii = '';
	                $strlen_var = strlen($var);
	
	               /*
	                * Iterate over every character in the string,
	                * escaping with a slash or encoding to UTF-8 where necessary
	                */
	                for ($c = 0; $c < $strlen_var; ++$c) {
	
	                    $ord_var_c = ord($var{$c});
	
	                    switch (true) {
	                        case $ord_var_c == 0x08:
	                            $ascii .= '\b';
	                            break;
	                        case $ord_var_c == 0x09:
	                            $ascii .= '\t';
	                            break;
	                        case $ord_var_c == 0x0A:
	                            $ascii .= '\n';
	                            break;
	                        case $ord_var_c == 0x0C:
	                            $ascii .= '\f';
	                            break;
	                        case $ord_var_c == 0x0D:
	                            $ascii .= '\r';
	                            break;
	
	                        case $ord_var_c == 0x22:
	                        case $ord_var_c == 0x2F:
	                        case $ord_var_c == 0x5C:
	                            // double quote, slash, slosh
	                            $ascii .= '\\'.$var{$c};
	                            break;
	
	                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
	                            // characters U-00000000 - U-0000007F (same as ASCII)
	                            $ascii .= $var{$c};
	                            break;
	
	                        case (($ord_var_c & 0xE0) == 0xC0):
	                            // characters U-00000080 - U-000007FF, mask 110XXXXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
	                            $c += 1;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	
	                        case (($ord_var_c & 0xF0) == 0xE0):
	                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}));
	                            $c += 2;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	
	                        case (($ord_var_c & 0xF8) == 0xF0):
	                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}));
	                            $c += 3;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	
	                        case (($ord_var_c & 0xFC) == 0xF8):
	                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}),
	                                         ord($var{$c + 4}));
	                            $c += 4;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	
	                        case (($ord_var_c & 0xFE) == 0xFC):
	                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}),
	                                         ord($var{$c + 4}),
	                                         ord($var{$c + 5}));
	                            $c += 5;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	                    }
	                }
	
	                return '"'.$ascii.'"';
	
	            case 'array':
	               /*
	                * As per JSON spec if any array key is not an integer
	                * we must treat the the whole array as an object. We
	                * also try to catch a sparsely populated associative
	                * array with numeric keys here because some JS engines
	                * will create an array with empty indexes up to
	                * max_index which can cause memory issues and because
	                * the keys, which may be relevant, will be remapped
	                * otherwise.
	                *
	                * As per the ECMA and JSON specification an object may
	                * have any string as a property. Unfortunately due to
	                * a hole in the ECMA specification if the key is a
	                * ECMA reserved word or starts with a digit the
	                * parameter is only accessible using ECMAScript's
	                * bracket notation.
	                */
	
	                // treat as a JSON object
	                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
	                    $properties = array_map(array($this, 'name_value'),
	                                            array_keys($var),
	                                            array_values($var));
	
	                    foreach($properties as $property) {
	                        if(Services_JSON::isError($property)) {
	                            return $property;
	                        }
	                    }
	
	                    return '{' . join(',', $properties) . '}';
	                }
	
	                // treat it like a regular array
	                $elements = array_map(array($this, 'encode'), $var);
	
	                foreach($elements as $element) {
	                    if(Services_JSON::isError($element)) {
	                        return $element;
	                    }
	                }
	
	                return '[' . join(',', $elements) . ']';
	
	            case 'object':
	                $vars = get_object_vars($var);
	
	                $properties = array_map(array($this, 'name_value'),
	                                        array_keys($vars),
	                                        array_values($vars));
	
	                foreach($properties as $property) {
	                    if(Services_JSON::isError($property)) {
	                        return $property;
	                    }
	                }
	
	                return '{' . join(',', $properties) . '}';
	
	            default:
	                return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
	                    ? 'null'
	                    : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
	        }
	    }
	
	   /**
	    * array-walking function for use in generating JSON-formatted name-value pairs
	    *
	    * @param    string  $name   name of key to use
	    * @param    mixed   $value  reference to an array element to be encoded
	    *
	    * @return   string  JSON-formatted name-value pair, like '"name":value'
	    * @access   private
	    */
	    function name_value($name, $value)
	    {
	        $encoded_value = $this->encode($value);
	
	        if(Services_JSON::isError($encoded_value)) {
	            return $encoded_value;
	        }
	
	        return $this->encode(strval($name)) . ':' . $encoded_value;
	    }
	
	   /**
	    * reduce a string by removing leading and trailing comments and whitespace
	    *
	    * @param    $str    string      string value to strip of comments and whitespace
	    *
	    * @return   string  string value stripped of comments and whitespace
	    * @access   private
	    */
	    function reduce_string($str)
	    {
	        $str = preg_replace(array(
	
	                // eliminate single line comments in '// ...' form
	                '#^\s*//(.+)$#m',
	
	                // eliminate multi-line comments in '/* ... */' form, at start of string
	                '#^\s*/\*(.+)\*/#Us',
	
	                // eliminate multi-line comments in '/* ... */' form, at end of string
	                '#/\*(.+)\*/\s*$#Us'
	
	            ), '', $str);
	
	        // eliminate extraneous space
	        return trim($str);
	    }
	
	   /**
	    * decodes a JSON string into appropriate variable
	    *
	    * @param    string  $str    JSON-formatted string
	    *
	    * @return   mixed   number, boolean, string, array, or object
	    *                   corresponding to given JSON input string.
	    *                   See argument 1 to Services_JSON() above for object-output behavior.
	    *                   Note that decode() always returns strings
	    *                   in ASCII or UTF-8 format!
	    * @access   public
	    */
	    function decode($str)
	    {
	        $str = $this->reduce_string($str);
	
	        switch (strtolower($str)) {
	            case 'true':
	                return true;
	
	            case 'false':
	                return false;
	
	            case 'null':
	                return null;
	
	            default:
	                $m = array();
	
	                if (is_numeric($str)) {
	                    // Lookie-loo, it's a number
	
	                    // This would work on its own, but I'm trying to be
	                    // good about returning integers where appropriate:
	                    // return (float)$str;
	
	                    // Return float or int, as appropriate
	                    return ((float)$str == (integer)$str)
	                        ? (integer)$str
	                        : (float)$str;
	
	                } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
	                    // STRINGS RETURNED IN UTF-8 FORMAT
	                    $delim = substr($str, 0, 1);
	                    $chrs = substr($str, 1, -1);
	                    $utf8 = '';
	                    $strlen_chrs = strlen($chrs);
	
	                    for ($c = 0; $c < $strlen_chrs; ++$c) {
	
	                        $substr_chrs_c_2 = substr($chrs, $c, 2);
	                        $ord_chrs_c = ord($chrs{$c});
	
	                        switch (true) {
	                            case $substr_chrs_c_2 == '\b':
	                                $utf8 .= chr(0x08);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\t':
	                                $utf8 .= chr(0x09);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\n':
	                                $utf8 .= chr(0x0A);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\f':
	                                $utf8 .= chr(0x0C);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\r':
	                                $utf8 .= chr(0x0D);
	                                ++$c;
	                                break;
	
	                            case $substr_chrs_c_2 == '\\"':
	                            case $substr_chrs_c_2 == '\\\'':
	                            case $substr_chrs_c_2 == '\\\\':
	                            case $substr_chrs_c_2 == '\\/':
	                                if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
	                                   ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
	                                    $utf8 .= $chrs{++$c};
	                                }
	                                break;
	
	                            case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
	                                // single, escaped unicode character
	                                $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
	                                       . chr(hexdec(substr($chrs, ($c + 4), 2)));
	                                $utf8 .= $this->utf162utf8($utf16);
	                                $c += 5;
	                                break;
	
	                            case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
	                                $utf8 .= $chrs{$c};
	                                break;
	
	                            case ($ord_chrs_c & 0xE0) == 0xC0:
	                                // characters U-00000080 - U-000007FF, mask 110XXXXX
	                                //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 2);
	                                ++$c;
	                                break;
	
	                            case ($ord_chrs_c & 0xF0) == 0xE0:
	                                // characters U-00000800 - U-0000FFFF, mask 1110XXXX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 3);
	                                $c += 2;
	                                break;
	
	                            case ($ord_chrs_c & 0xF8) == 0xF0:
	                                // characters U-00010000 - U-001FFFFF, mask 11110XXX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 4);
	                                $c += 3;
	                                break;
	
	                            case ($ord_chrs_c & 0xFC) == 0xF8:
	                                // characters U-00200000 - U-03FFFFFF, mask 111110XX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 5);
	                                $c += 4;
	                                break;
	
	                            case ($ord_chrs_c & 0xFE) == 0xFC:
	                                // characters U-04000000 - U-7FFFFFFF, mask 1111110X
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 6);
	                                $c += 5;
	                                break;
	
	                        }
	
	                    }
	
	                    return $utf8;
	
	                } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
	                    // array, or object notation
	
	                    if ($str{0} == '[') {
	                        $stk = array(SERVICES_JSON_IN_ARR);
	                        $arr = array();
	                    } else {
	                        if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                            $stk = array(SERVICES_JSON_IN_OBJ);
	                            $obj = array();
	                        } else {
	                            $stk = array(SERVICES_JSON_IN_OBJ);
	                            $obj = new stdClass();
	                        }
	                    }
	
	                    array_push($stk, array('what'  => SERVICES_JSON_SLICE,
	                                           'where' => 0,
	                                           'delim' => false));
	
	                    $chrs = substr($str, 1, -1);
	                    $chrs = $this->reduce_string($chrs);
	
	                    if ($chrs == '') {
	                        if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                            return $arr;
	
	                        } else {
	                            return $obj;
	
	                        }
	                    }
	
	                    //print("\nparsing {$chrs}\n");
	
	                    $strlen_chrs = strlen($chrs);
	
	                    for ($c = 0; $c <= $strlen_chrs; ++$c) {
	
	                        $top = end($stk);
	                        $substr_chrs_c_2 = substr($chrs, $c, 2);
	
	                        if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
	                            // found a comma that is not inside a string, array, etc.,
	                            // OR we've reached the end of the character list
	                            $slice = substr($chrs, $top['where'], ($c - $top['where']));
	                            array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
	                            //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
	
	                            if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                                // we are in an array, so just push an element onto the stack
	                                array_push($arr, $this->decode($slice));
	
	                            } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
	                                // we are in an object, so figure
	                                // out the property name and set an
	                                // element in an associative array,
	                                // for now
	                                $parts = array();
	                                
	                                if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
	                                    // "name":value pair
	                                    $key = $this->decode($parts[1]);
	                                    $val = $this->decode($parts[2]);
	
	                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                                        $obj[$key] = $val;
	                                    } else {
	                                        $obj->$key = $val;
	                                    }
	                                } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
	                                    // name:value pair, where name is unquoted
	                                    $key = $parts[1];
	                                    $val = $this->decode($parts[2]);
	
	                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                                        $obj[$key] = $val;
	                                    } else {
	                                        $obj->$key = $val;
	                                    }
	                                }
	
	                            }
	
	                        } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
	                            // found a quote, and we are not inside a string
	                            array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
	                            //print("Found start of string at {$c}\n");
	
	                        } elseif (($chrs{$c} == $top['delim']) &&
	                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
	                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
	                            // found a quote, we're in a string, and it's not escaped
	                            // we know that it's not escaped becase there is _not_ an
	                            // odd number of backslashes at the end of the string so far
	                            array_pop($stk);
	                            //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
	
	                        } elseif (($chrs{$c} == '[') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a left-bracket, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
	                            //print("Found start of array at {$c}\n");
	
	                        } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
	                            // found a right-bracket, and we're in an array
	                            array_pop($stk);
	                            //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
	
	                        } elseif (($chrs{$c} == '{') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a left-brace, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
	                            //print("Found start of object at {$c}\n");
	
	                        } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
	                            // found a right-brace, and we're in an object
	                            array_pop($stk);
	                            //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
	
	                        } elseif (($substr_chrs_c_2 == '/*') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a comment start, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
	                            $c++;
	                            //print("Found start of comment at {$c}\n");
	
	                        } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
	                            // found a comment end, and we're in one now
	                            array_pop($stk);
	                            $c++;
	
	                            for ($i = $top['where']; $i <= $c; ++$i)
	                                $chrs = substr_replace($chrs, ' ', $i, 1);
	
	                            //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
	
	                        }
	
	                    }
	
	                    if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                        return $arr;
	
	                    } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
	                        return $obj;
	
	                    }
	
	                }
	        }
	    }
	
	    /**
	     * @todo Ultimately, this should just call PEAR::isError()
	     */
	    function isError($data, $code = null)
	    {
	        if (class_exists('pear')) {
	            return PEAR::isError($data, $code);
	        } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
	                                 is_subclass_of($data, 'services_json_error'))) {
	            return true;
	        }
	
	        return false;
	    }
	}
}

if (!class_exists('Services_JSON_Error')) {
	if (class_exists('PEAR_Error')) {
    class Services_JSON_Error extends PEAR_Error
    {
        function Services_JSON_Error($message = 'unknown error', $code = null,
                                     $mode = null, $options = null, $userinfo = null)
        {
            parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
        }
    }
	} else {
    /**
     * @todo Ultimately, this class shall be descended from PEAR_Error
     */
    class Services_JSON_Error
    {
        function Services_JSON_Error($message = 'unknown error', $code = null,
                                     $mode = null, $options = null, $userinfo = null)
        {

        }
    }
	}
}
