Extension:FBConnect/facebook-client/jsonwrapper/JSON/JSON.php

This file is part of the Facebook Platform PHP Client library available here: http://svn.facebook.com/svnroot/platform/clients/packages/facebook-platform.tar.gz (December 10, 2008)

*/ class Services_JSON {  /**    * constructs a new JSON instance *   * @param    int     $use    object behavior flags; combine with boolean-OR *   *                           possible values: *                          - SERVICES_JSON_LOOSE_TYPE:  loose typing. *                                  "{...}" syntax creates associative arrays *                                  instead of objects in decode. *                          - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression. *                                  Values which can't be encoded (e.g. resources) *                                  appear as NULL instead of throwing errors. *                                  By default, a deeply-nested resource will *                                  bubble up with an error, so all return values *                                  from encode should be checked with isError */   function Services_JSON($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 $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('PEAR_Error')) {

class Services_JSON_Error extends PEAR_Error {       function Services_JSON_Error($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 Services_JSON_Error($message = 'unknown error', $code = null,                                     $mode = null, $options = null, $userinfo = null) {

}   }

} ?>