* // 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); * */ class Services_JSON { /** * constructs a new JSON instance * * @param int $use object behavior flags; combine with boolean-OR * * possible values: * - SERVICES_JSON_LOOSE_TYPE: loose typing. * "{...}" syntax creates associative arrays * instead of objects in decode(). * - SERVICES_JSON_SUPPRESS_ERRORS: error suppression. * Values which can't be encoded (e.g. resources) * appear as NULL instead of throwing errors. * By default, a deeply-nested resource will * bubble up with an error, so all return values * from encode() should be checked with isError() */ public function Services_JSON($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 $utf16 UTF-16 character * @return string UTF-8 character * @access private */ public function utf162utf8($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 (127 & $bytes) == $bytes: return chr(127 & $bytes); break; case (2047 & $bytes) == $bytes: return chr(192 | $bytes >> 6 & 31) . chr(128 | $bytes & 63); break; case (65535 & $bytes) == $bytes: return chr(224 | $bytes >> 12 & 15) . chr(128 | $bytes >> 6 & 63) . chr(128 | $bytes & 63); break; } 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 $utf8 UTF-8 character * @return string UTF-16 character * @access private */ public function utf82utf16($utf8) { if( function_exists('mb_convert_encoding') ) { return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8'); } switch( strlen($utf8) ) { case 1: return $utf8; break; case 2: return chr(7 & ord($utf8[0]) >> 2) . chr(192 & ord($utf8[0]) << 6 | 63 & ord($utf8[1])); break; case 3: return chr(240 & ord($utf8[0]) << 4 | 15 & ord($utf8[1]) >> 2) . chr(192 & ord($utf8[1]) << 6 | 127 & ord($utf8[2])); break; } return ''; } /** * encodes an arbitrary variable into JSON format * * @param mixed $var any number, boolean, string, array, or object to be encoded. * see argument 1 to Services_JSON() above for array-parsing behavior. * if var is a strng, note that encode() always expects it * to be in ASCII or UTF-8 format! * * @return mixed JSON string representation of input var or an error if a problem occurs * @access public */ public function encode($var) { switch( gettype($var) ) { case 'boolean': return $var ? 'true' : 'false'; break; case 'NULL': return 'null'; break; case 'integer': return (int) $var; break; case 'double': break; case 'float': return (double) $var; break; case 'string': $ascii = ''; $strlen_var = strlen($var); $c = 0; while( $c < $strlen_var ) { $ord_var_c = ord($var[$c]); switch( true ) { case $ord_var_c == 8: $ascii .= "\\b"; break; case $ord_var_c == 9: $ascii .= "\\t"; break; case $ord_var_c == 10: $ascii .= "\\n"; break; case $ord_var_c == 12: $ascii .= "\\f"; break; case $ord_var_c == 13: $ascii .= "\\r"; break; case $ord_var_c == 34: break; case $ord_var_c == 47: break; case $ord_var_c == 92: $ascii .= "\\" . $var[$c]; break; case 32 <= $ord_var_c && $ord_var_c <= 127: $ascii .= $var[$c]; break; case ($ord_var_c & 224) == 192: $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 & 240) == 224: $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 & 248) == 240: $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 & 252) == 248: $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 & 254) == 252: $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)); } $c++; break; } return "\"" . $ascii . "\""; break; case 'array': if( is_array($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 $property ) { if( Services_JSON::iserror($property) ) { return $property; } } return "{" . join(',', $properties) . "}"; } $elements = array_map(array( $this, 'encode' ), $var); foreach( $elements as $element ) { if( Services_JSON::iserror($element) ) { return $element; } } return "[" . join(',', $elements) . "]"; break; 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) . "}"; break; default: return $this->use & SERVICES_JSON_SUPPRESS_ERRORS ? 'null' : new Services_JSON_Error(gettype($var) . " can not be encoded as JSON string"); break; } } /** * array-walking function for use in generating JSON-formatted name-value pairs * * @param string $name name of key to use * @param mixed $value reference to an array element to be encoded * * @return string JSON-formatted name-value pair, like '"name":value' * @access private */ public function name_value($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 $str string string value to strip of comments and whitespace * * @return string string value stripped of comments and whitespace * @access private */ public function reduce_string($str) { $str = preg_replace(array( "#^\\s*//(.+)\$#m", "#^\\s*/\\*(.+)\\*/#Us", "#/\\*(.+)\\*/\\s*\$#Us" ), '', $str); return trim($str); } /** * decodes a JSON string into appropriate variable * * @param string $str JSON-formatted string * * @return mixed number, boolean, string, array, or object * corresponding to given JSON input string. * See argument 1 to Services_JSON() above for object-output behavior. * Note that decode() always returns strings * in ASCII or UTF-8 format! * @access public */ public function decode($str) { $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 (double) $str == (int) $str ? (int) $str : (double) $str; } if( preg_match("/^(\"|').*(\\1)\$/s", $str, $m) && $m[1] == $m[2] ) { $delim = substr($str, 0, 1); $chrs = substr($str, 1, 0 - 1); $utf8 = ''; $strlen_chrs = strlen($chrs); $c = 0; while( $c < $strlen_chrs ) { $substr_chrs_c_2 = substr($chrs, $c, 2); $ord_chrs_c = ord($chrs[$c]); switch( true ) { case $substr_chrs_c_2 == "\\b": $utf8 .= chr(8); $c++; break; case $substr_chrs_c_2 == "\\t": $utf8 .= chr(9); $c++; break; case $substr_chrs_c_2 == "\\n": $utf8 .= chr(10); $c++; break; case $substr_chrs_c_2 == "\\f": $utf8 .= chr(12); $c++; break; case $substr_chrs_c_2 == "\\r": $utf8 .= chr(13); $c++; break; case $substr_chrs_c_2 == "\\\"": break; case $substr_chrs_c_2 == "\\'": break; case $substr_chrs_c_2 == "\\\\": break; 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 32 <= $ord_chrs_c && $ord_chrs_c <= 127: $utf8 .= $chrs[$c]; break; case ($ord_chrs_c & 224) == 192: $utf8 .= substr($chrs, $c, 2); $c++; break; case ($ord_chrs_c & 240) == 224: $utf8 .= substr($chrs, $c, 3); $c += 2; break; case ($ord_chrs_c & 248) == 240: $utf8 .= substr($chrs, $c, 4); $c += 3; break; case ($ord_chrs_c & 252) == 248: $utf8 .= substr($chrs, $c, 5); $c += 4; break; case ($ord_chrs_c & 254) == 252: $utf8 .= substr($chrs, $c, 6); $c += 5; } $c++; break; } return $utf8; } if( 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 ); $obj = new stdClass(); } } array_push($stk, array( 'what' => SERVICES_JSON_SLICE, 'where' => 0, 'delim' => false )); $chrs = substr($str, 1, 0 - 1); $chrs = $this->reduce_string($chrs); if( $chrs == '' ) { if( reset($stk) == SERVICES_JSON_IN_ARR ) { return $arr; } 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)); } else { if( 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; } } else { if( 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 = $val; } } } } } } else { if( ($chrs[$c] == "\"" || $chrs[$c] == "'") && $top['what'] != SERVICES_JSON_IN_STR ) { array_push($stk, array( 'what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs[$c] )); } else { if( $chrs[$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); } else { if( $chrs[$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 )); } else { if( $chrs[$c] == "]" && $top['what'] == SERVICES_JSON_IN_ARR ) { array_pop($stk); } else { if( $chrs[$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 )); } else { if( $chrs[$c] == "}" && $top['what'] == SERVICES_JSON_IN_OBJ ) { array_pop($stk); } else { if( $substr_chrs_c_2 == "/*" && in_array($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++; } else { if( $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 $arr; } if( reset($stk) == SERVICES_JSON_IN_OBJ ) { return $obj; } } break; } } /** * @todo Ultimately, this should just call PEAR::isError() */ public function isError($data, $code = null) { if( class_exists('pear') ) { return PEAR::iserror($data, $code); } if( is_object($data) && (get_class($data) == 'services_json_error' || is_subclass_of($data, 'services_json_error')) ) { return true; } return false; } }