<?php
// no direct access
defined ( '_JEXEC' ) or die ( 'Restricted access' );
 

/* 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,v 1.31 2006/06/28 05:54:17 migurski Exp $
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
 */
if(!class_exists('Services_JSON')) {

	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_SLICE',   1);
	
	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_STR',  2);
	
	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_ARR',  3);
	
	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_OBJ',  4);
	
	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_CMT', 5);
	
	/**
	 * Behavior switch for Services_JSON::decode()
	 */
	define('SERVICES_JSON_LOOSE_TYPE', 16);
	
	/**
	 * Behavior switch for Services_JSON::decode()
	 */
	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>
	 */
	class Services_JSON
	{
		/**
	    * constructs a new JSON instance
	    *
	    * @param    int     $use    object behavior flags; combine with boolean-OR
	    *
	    *                           possible values:
	    *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
	    *                                   "{...}" syntax creates associative arrays
	    *                                   instead of objects in decode().
	    *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
	    *                                   Values which can't be encoded (e.g. resources)
	    *                                   appear as NULL instead of throwing errors.
	    *                                   By default, a deeply-nested resource will
	    *                                   bubble up with an error, so all return values
	    *                                   from encode() should be checked with isError()
	    */
		function __construct($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 __construct($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 __construct($message = 'unknown error', $code = null,
			$mode = null, $options = null, $userinfo = null)
			{
	
			}
		}
	
	}
	
}

// Future-friendly json_encode
if( !function_exists('json_encode') ) {
    function json_encode($data, $assoc= false) {
    	$use = !$assoc ? 0 : SERVICES_JSON_LOOSE_TYPE;
    	
        $json = new Services_JSON($use);
        return( $json->encode($data) );
    }
}

// Future-friendly json_decode
if( !function_exists('json_decode') ) {
    function json_decode($data, $assoc= false) {
    	$use = !$assoc ? 0 : SERVICES_JSON_LOOSE_TYPE;
    	
        $json = new Services_JSON($use);
        return( $json->decode($data) );
    }
}

?>