<?php
/*************************************************************************************
 * @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
*************************************************************************************/
/**
 * 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);


class json_lib
{
	var $json_phpok;
	function __construct()
	{
		$this->json_phpok = true;
	}

	function json_lib()
	{
		$this->__construct();
	}

    function name_value($name, $value)
    {
        $encoded_value = $this->encode($value);

        if(json_lib::is_error($encoded_value)) {
            return $encoded_value;
        }

        return $this->encode(strval($name)) . ':' . $encoded_value;
    }

	//编码
	function encode($var)
	{
		if(function_exists("json_encode"))
		{
			return json_encode($var);
		}

		switch (gettype($var))
		{
			case 'boolean':
			return $var ? 'true' : 'false';

			case 'NULL':
			return 'null';

			case 'integer':
			return intval($var);

			case 'double':
			case 'float':
			return floatval($var);

			case 'string':
				$ascii = '';
				$strlen_var = strlen($var);
				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:
							$ascii .= '\\'.$var{$c};
						break;
						case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
							$ascii .= $var{$c};
						break;
						case (($ord_var_c & 0xE0) == 0xC0):
							$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):
							$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):
							$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):
							$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):
							$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':
				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 $property)
					{
						if($this->is_error($property))
						{
							return $property;
						}
					}

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

				$elements = array_map(array($this, 'encode'), $var);

				foreach($elements as $element)
				{
					if($this->is_error($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 $property)
				{
					if($this->is_error($property))
					{
						return $property;
					}
				}
			return '{' . join(',', $properties) . '}';

			default:
			return false;
		}
	}

	function decode($str)
	{
		if(function_exists("json_decode"))
		{
			return json_decode($str,true);
		}

		$str = $this->reduce_string($str);

		switch (strtolower($str))
		{
			case 'true':
				return true;
			break;

			case 'false':
				return false;
			break;

			case 'null':
				return null;
			break;

			default:
				$m = array();
				if (is_numeric($str))
				{
					return ((float)$str == (integer)$str) ? (integer)$str : (float)$str;
				}
				elseif(preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2])
				{
					$delim = substr($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)):
								$utf16 = chr(hexdec(substr($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:
								$utf8 .= substr($chrs, $c, 2);
								++$c;
							break;
							case ($ord_chrs_c & 0xF0) == 0xE0:
								$utf8 .= substr($chrs, $c, 3);
								$c += 2;
							break;
							case ($ord_chrs_c & 0xF8) == 0xF0:
								$utf8 .= substr($chrs, $c, 4);
								$c += 3;
							break;
							case ($ord_chrs_c & 0xFC) == 0xF8:
								$utf8 .= substr($chrs, $c, 5);
								$c += 4;
							break;
							case ($ord_chrs_c & 0xFE) == 0xFC:
								$utf8 .= substr($chrs, $c, 6);
								$c += 5;
							break;
						}
					}
					return $utf8;
				}
				elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str))
				{
					if ($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);
							///这个是做什么的啊
							$obj = new stdClass();
						}
					}
					array_push($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;
						}
					}
					$strlen_chrs = strlen($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)))
						{
							$slice = substr($chrs, $top['where'], ($c - $top['where']));
							array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
							if (reset($stk) == SERVICES_JSON_IN_ARR)
							{
								array_push($arr, $this->decode($slice));
							}
							elseif(reset($stk) == SERVICES_JSON_IN_OBJ)
							{
								$parts = array();
								if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts))
								{
									$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))
								{
									$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))
						{
							array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
						}
						elseif(($chrs{$c} == $top['delim']) && ($top['what'] == SERVICES_JSON_IN_STR) && ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1))
						{
							array_pop($stk);
						}
						elseif (($chrs{$c} == '[') && in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR,SERVICES_JSON_IN_OBJ)))
						{
							array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
						}
						elseif(($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR))
						{
							array_pop($stk);
						}
						elseif (($chrs{$c} == '{') && in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ)))
						{
							array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
						}
						elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ))
						{
							array_pop($stk);
						}
						elseif (($substr_chrs_c_2 == '/*') && in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ)))
						{
							array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
							$c++;
						}
						elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT))
						{
							array_pop($stk);
							$c++;
							for ($i = $top['where']; $i <= $c; ++$i)
							{
								$chrs = substr_replace($chrs, ' ', $i, 1);
							}
						}
					}
					if (reset($stk) == SERVICES_JSON_IN_ARR)
					{
						return $arr;
					}
					elseif (reset($stk) == SERVICES_JSON_IN_OBJ)
					{
						return $obj;
					}
				}
			break;
		}
	}

	function reduce_string($str)
	{
		$str = preg_replace(array('#^\s*//(.+)$#m','#^\s*/\*(.+)\*/#Us','#/\*(.+)\*/\s*$#Us'), '', $str);
		return trim($str);
	}


	function utf162utf8($utf16)
	{
		if(function_exists('mb_convert_encoding'))
		{
			return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
		}

		$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
		switch(true)
		{
			case ((0x7F & $bytes) == $bytes):
			return chr(0x7F & $bytes);

			case (0x07FF & $bytes) == $bytes:
			return chr(0xC0 | (($bytes >> 6) & 0x1F)) . chr(0x80 | ($bytes & 0x3F));

			case (0xFFFF & $bytes) == $bytes:
			return chr(0xE0 | (($bytes >> 12) & 0x0F)) . chr(0x80 | (($bytes >> 6) & 0x3F))	. chr(0x80 | ($bytes & 0x3F));
		}
		return '';
	}

	function utf82utf16($utf8)
	{
		if(function_exists('mb_convert_encoding'))
		{
			return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
		}
		switch(strlen($utf8))
		{
			case 1:
			return $utf8;

			case 2:
			return chr(0x07 & (ord($utf8{0}) >> 2))	. chr((0xC0 & (ord($utf8{0}) << 6))	| (0x3F & ord($utf8{1})));

			case 3:
			return chr((0xF0 & (ord($utf8{0}) << 4)) | (0x0F & (ord($utf8{1}) >> 2))) . chr((0xC0 & (ord($utf8{1}) << 6)) | (0x7F & ord($utf8{2})));
		}
		return '';
	}

	function is_error($data)
	{
		if(is_object($data) && (get_class($data) == 'services_json_error' || is_subclass_of($data, 'services_json_error')))
		{
            return true;
        }
        return false;
	}
}
?>