{

/**

* 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 HTML_AJAX_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 $ut8;

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 HTML_AJAX_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(HTML_AJAX_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(HTML_AJAX_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(HTML_AJAX_JSON::isError($property))

return $property;

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

default:

return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)

? 'null'

: new HTML_AJAX_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(HTML_AJAX_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 HTML_AJAX_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:

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

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) &&

(($chrs{$c - 1} != '\\') ||

($chrs{$c - 1} == '\\' && $chrs{$c - 2} == '\\'))) {

// found a quote, we're in a string, and it's not escaped

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;

}

{

function HTML_AJAX_JSON_Error($message = 'unknown error', $code = null,

$mode = null, $options = null, $userinfo = null)

{

parent::PEAR_Error($message, $code, $mode, $options, $userinfo);

}

{

function HTML_AJAX_JSON_Error($message = 'unknown error', $code = null,

$mode = null, $options = null, $userinfo = null)

{

}