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<?php
if (defined('WFWAF_VERSION') && !defined('WFWAF_RUN_COMPLETE')) {

/* 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 305040 2010-11-02 23:19:03Z alan_k $
 * @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
 */
define('WF_SERVICES_JSON_SLICE',   1);

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

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

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

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

/**
 * Behavior switch for Services_JSON::decode()
 */
define('WF_SERVICES_JSON_LOOSE_TYPE', 16);

/**
 * Behavior switch for Services_JSON::decode()
 */
define('WF_SERVICES_JSON_SUPPRESS_ERRORS', 32);

/**
 * Behavior switch for Services_JSON::decode()
 */
define('WF_SERVICES_JSON_USE_TO_JSON', 64);

/**
 * 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 wfServices_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()
	 *                           - SERVICES_JSON_USE_TO_JSON:  call toJSON when serializing objects
	 *                                   It serializes the return value from the toJSON call rather
	 *                                   than the object itself, toJSON can return associative arrays,
	 *                                   strings or numbers, if you return an object, make sure it does
	 *                                   not have a toJSON method, otherwise an error will occur.
	 */
	function __construct( $use = 0 )
	{
		$this->use = $use;
		$this->_mb_strlen            = function_exists('mb_strlen');
		$this->_mb_convert_encoding  = function_exists('mb_convert_encoding');
		$this->_mb_substr            = function_exists('mb_substr');
	}

/**
	 * PHP4 constructor.
	 */
	public function wfServices_JSON( $use = 0 ) {
		self::__construct( $use );
	}
	// private - cache the mbstring lookup results..
	var $_mb_strlen = false;
	var $_mb_substr = false;
	var $_mb_convert_encoding = false;

/**
	 * 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($this->_mb_convert_encoding) {
			return mb_convert_encoding($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($this->_mb_convert_encoding) {
			return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
		}

switch($this->strlen8($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 (and sends JSON Header)
	 *
	 * @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)
	{
		header('Content-type: application/json');
		return $this->encodeUnsafe($var);
	}
	/**
	 * encodes an arbitrary variable into JSON format without JSON Header - warning - may allow XSS!!!!)
	 *
	 * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
	 *                           see argument 1 to Services_JSON() above for array-parsing behavior.
	 *                           if var is a strng, note that encode() always expects it
	 *                           to be in ASCII or UTF-8 format!
	 *
	 * @return   mixed   JSON string representation of input var or an error if a problem occurs
	 * @access   public
	 */
	function encodeUnsafe($var)
	{
		// see bug #16908 - regarding numeric locale printing
		$lc = setlocale(LC_NUMERIC, 0);
		setlocale(LC_NUMERIC, 'C');
		$ret = $this->_encode($var);
		setlocale(LC_NUMERIC, $lc);
		return $ret;

}
	/**
	 * PRIVATE CODE that does the work of 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 = $this->strlen8($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 (($ord_var_c & 0xE0) == 0xC0):
							// characters U-00000080 - U-000007FF, mask 110XXXXX
							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
							if ($c+1 >= $strlen_var) {
								$c += 1;
								$ascii .= '?';
								break;
							}

$char = pack('C*', $ord_var_c, ord($var[$c + 1]));
							$c += 1;
							$utf16 = $this->utf82utf16($char);
							$ascii .= sprintf('\u%04s', bin2hex($utf16));
							break;

case (($ord_var_c & 0xF0) == 0xE0):
							if ($c+2 >= $strlen_var) {
								$c += 2;
								$ascii .= '?';
								break;
							}
							// 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 (($ord_var_c & 0xF8) == 0xF0):
							if ($c+3 >= $strlen_var) {
								$c += 3;
								$ascii .= '?';
								break;
							}
							// 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 (($ord_var_c & 0xFC) == 0xF8):
							// characters U-00200000 - U-03FFFFFF, mask 111110XX
							// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
							if ($c+4 >= $strlen_var) {
								$c += 4;
								$ascii .= '?';
								break;
							}
							$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 (($ord_var_c & 0xFE) == 0xFC):
							if ($c+5 >= $strlen_var) {
								$c += 5;
								$ascii .= '?';
								break;
							}
							// 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 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 $property) {
						if(wfServices_JSON::isError($property)) {
							return $property;
						}
					}

return '{' . join(',', $properties) . '}';
				}

// treat it like a regular array
				$elements = array_map(array($this, '_encode'), $var);

foreach($elements as $element) {
					if(wfServices_JSON::isError($element)) {
						return $element;
					}
				}

return '[' . join(',', $elements) . ']';

case 'object':

// support toJSON methods.
				if (($this->use & WF_SERVICES_JSON_USE_TO_JSON) && method_exists($var, 'toJSON')) {
					// this may end up allowing unlimited recursion
					// so we check the return value to make sure it's not got the same method.
					$recode = $var->toJSON();

if (method_exists($recode, 'toJSON')) {

return ($this->use & WF_SERVICES_JSON_SUPPRESS_ERRORS)
							? 'null'
							: new wfServices_JSON_Error(get_class($var).
								" toJSON returned an object with a toJSON method.");

}

return $this->_encode( $recode );
				}

$vars = get_object_vars($var);

$properties = array_map(array($this, 'name_value'),
					array_keys($vars),
					array_values($vars));

foreach($properties as $property) {
					if(wfServices_JSON::isError($property)) {
						return $property;
					}
				}

return '{' . join(',', $properties) . '}';

default:
				return ($this->use & WF_SERVICES_JSON_SUPPRESS_ERRORS)
					? 'null'
					: new wfServices_JSON_Error(gettype($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(wfServices_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 = $this->substr8($str, 0, 1);
					$chrs = $this->substr8($str, 1, -1);
					$utf8 = '';
					$strlen_chrs = $this->strlen8($chrs);

for ($c = 0; $c < $strlen_chrs; ++$c) {

$substr_chrs_c_2 = $this->substr8($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', $this->substr8($chrs, $c, 6)):
								// single, escaped unicode character
								$utf16 = chr(hexdec($this->substr8($chrs, ($c + 2), 2)))
									. chr(hexdec($this->substr8($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 .= $this->substr8($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 .= $this->substr8($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 .= $this->substr8($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 .= $this->substr8($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 .= $this->substr8($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(WF_SERVICES_JSON_IN_ARR);
						$arr = array();
					} else {
						if ($this->use & WF_SERVICES_JSON_LOOSE_TYPE) {
							$stk = array(WF_SERVICES_JSON_IN_OBJ);
							$obj = array();
						} else {
							$stk = array(WF_SERVICES_JSON_IN_OBJ);
							$obj = new stdClass();
						}
					}

array_push($stk, array('what'  => WF_SERVICES_JSON_SLICE,
					                       'where' => 0,
					                       'delim' => false));

$chrs = $this->substr8($str, 1, -1);
					$chrs = $this->reduce_string($chrs);

if ($chrs == '') {
						if (reset($stk) == WF_SERVICES_JSON_IN_ARR) {
							return $arr;

} else {
							return $obj;

}
					}

//print("\nparsing {$chrs}\n");

$strlen_chrs = $this->strlen8($chrs);

for ($c = 0; $c <= $strlen_chrs; ++$c) {

$top = end($stk);
						$substr_chrs_c_2 = $this->substr8($chrs, $c, 2);

if (($c == $strlen_chrs) || (($chrs[$c] == ',') && ($top['what'] == WF_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 = $this->substr8($chrs, $top['where'], ($c - $top['where']));
							array_push($stk, array('what' => WF_SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
							//print("Found split at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");

if (reset($stk) == WF_SERVICES_JSON_IN_ARR) {
								// we are in an array, so just push an element onto the stack
								array_push($arr, $this->decode($slice));

} elseif (reset($stk) == WF_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*:/Uis', $slice, $parts)) {
									// "name":value pair
									$key = $this->decode($parts[1]);
									$val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));
									if ($this->use & WF_SERVICES_JSON_LOOSE_TYPE) {
										$obj[$key] = $val;
									} else {
										$obj->$key = $val;
									}
								} elseif (preg_match('/^\s*(\w+)\s*:/Uis', $slice, $parts)) {
									// name:value pair, where name is unquoted
									$key = $parts[1];
									$val = $this->decode(trim(substr($slice, strlen($parts[0])), ", \t\n\r\0\x0B"));

if ($this->use & WF_SERVICES_JSON_LOOSE_TYPE) {
										$obj[$key] = $val;
									} else {
										$obj->$key = $val;
									}
								}

}

} elseif ((($chrs[$c] == '"') || ($chrs[$c] == "'")) && ($top['what'] != WF_SERVICES_JSON_IN_STR)) {
							// found a quote, and we are not inside a string
							array_push($stk, array('what' => WF_SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs[$c]));
							//print("Found start of string at {$c}\n");

} elseif (($chrs[$c] == $top['delim']) &&
							($top['what'] == WF_SERVICES_JSON_IN_STR) &&
							(($this->strlen8($this->substr8($chrs, 0, $c)) - $this->strlen8(rtrim($this->substr8($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 {$c}: ".$this->substr8($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");

} elseif (($chrs[$c] == '[') &&
							in_array($top['what'], array(WF_SERVICES_JSON_SLICE, WF_SERVICES_JSON_IN_ARR, WF_SERVICES_JSON_IN_OBJ))) {
							// found a left-bracket, and we are in an array, object, or slice
							array_push($stk, array('what' => WF_SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
							//print("Found start of array at {$c}\n");

} elseif (($chrs[$c] == ']') && ($top['what'] == WF_SERVICES_JSON_IN_ARR)) {
							// found a right-bracket, and we're in an array
							array_pop($stk);
							//print("Found end of array at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");

} elseif (($chrs[$c] == '{') &&
							in_array($top['what'], array(WF_SERVICES_JSON_SLICE, WF_SERVICES_JSON_IN_ARR, WF_SERVICES_JSON_IN_OBJ))) {
							// found a left-brace, and we are in an array, object, or slice
							array_push($stk, array('what' => WF_SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
							//print("Found start of object at {$c}\n");

} elseif (($chrs[$c] == '}') && ($top['what'] == WF_SERVICES_JSON_IN_OBJ)) {
							// found a right-brace, and we're in an object
							array_pop($stk);
							//print("Found end of object at {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");

} elseif (($substr_chrs_c_2 == '/*') &&
							in_array($top['what'], array(WF_SERVICES_JSON_SLICE, WF_SERVICES_JSON_IN_ARR, WF_SERVICES_JSON_IN_OBJ))) {
							// found a comment start, and we are in an array, object, or slice
							array_push($stk, array('what' => WF_SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
							$c++;
							//print("Found start of comment at {$c}\n");

} elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == WF_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 {$c}: ".$this->substr8($chrs, $top['where'], (1 + $c - $top['where']))."\n");

}

if (reset($stk) == WF_SERVICES_JSON_IN_ARR) {
						return $arr;

} elseif (reset($stk) == WF_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($data) == 'wfservices_json_error' ||
				is_subclass_of($data, 'wfServices_JSON_Error'))) {
			return true;
		}

return false;
	}

/**
	 * Calculates length of string in bytes
	 * @param string
	 * @return integer length
	 */
	function strlen8( $str )
	{
		if ( $this->_mb_strlen ) {
			return mb_strlen( $str, "8bit" );
		}
		return strlen( $str );
	}

/**
	 * Returns part of a string, interpreting $start and $length as number of bytes.
	 * @param string
	 * @param integer start
	 * @param integer length
	 * @return integer length
	 */
	function substr8( $string, $start, $length=false )
	{
		if ( $length === false ) {
			$length = $this->strlen8( $string ) - $start;
		}
		if ( $this->_mb_substr ) {
			return mb_substr( $string, $start, $length, "8bit" );
		}
		return substr( $string, $start, $length );
	}

}

if (class_exists('PEAR_Error')) {

class wfServices_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);
		}

public function wfServices_JSON_Error($message = 'unknown error', $code = null,
		                                    $mode = null, $options = null, $userinfo = null) {
			self::__construct($message = 'unknown error', $code = null,
				$mode = null, $options = null, $userinfo = null);
		}
	}

} else {

/**
	 * @todo Ultimately, this class shall be descended from PEAR_Error
	 */
	class wfServices_JSON_Error
	{
		/**
		 * PHP5 constructor.
		 */
		function __construct( $message = 'unknown error', $code = null,
		                      $mode = null, $options = null, $userinfo = null )
		{

}

/**
		 * PHP4 constructor.
		 */
		public function wfServices_JSON_Error( $message = 'unknown error', $code = null,
		                                     $mode = null, $options = null, $userinfo = null ) {
			self::__construct( $message, $code, $mode, $options, $userinfo );
		}
	}

}
}