json.class.php

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					if(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(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, $code = null)
	{
		if (is_object($data) && (get_class($data) == 'services_json_error' ||
								 is_subclass_of($data, 'services_json_error'))) {
			return true;
		}

		return false;
	}
}

/**
 * @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)
	{

	}
}