includes/json.php
changeset 1 fe660c52c48f
equal deleted inserted replaced
0:902822492a68 1:fe660c52c48f
       
     1 <?php
       
     2 /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
       
     3 
       
     4 /**
       
     5 * Converts to and from JSON format.
       
     6 *
       
     7 * JSON (JavaScript Object Notation) is a lightweight data-interchange
       
     8 * format. It is easy for humans to read and write. It is easy for machines
       
     9 * to parse and generate. It is based on a subset of the JavaScript
       
    10 * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
       
    11 * This feature can also be found in  Python. JSON is a text format that is
       
    12 * completely language independent but uses conventions that are familiar
       
    13 * to programmers of the C-family of languages, including C, C++, C#, Java,
       
    14 * JavaScript, Perl, TCL, and many others. These properties make JSON an
       
    15 * ideal data-interchange language.
       
    16 *
       
    17 * This package provides a simple encoder and decoder for JSON notation. It
       
    18 * is intended for use with client-side Javascript applications that make
       
    19 * use of HTTPRequest to perform server communication functions - data can
       
    20 * be encoded into JSON notation for use in a client-side javascript, or
       
    21 * decoded from incoming Javascript requests. JSON format is native to
       
    22 * Javascript, and can be directly eval()'ed with no further parsing
       
    23 * overhead
       
    24 *
       
    25 * All strings should be in ASCII or UTF-8 format!
       
    26 *
       
    27 * LICENSE: Redistribution and use in source and binary forms, with or
       
    28 * without modification, are permitted provided that the following
       
    29 * conditions are met: Redistributions of source code must retain the
       
    30 * above copyright notice, this list of conditions and the following
       
    31 * disclaimer. Redistributions in binary form must reproduce the above
       
    32 * copyright notice, this list of conditions and the following disclaimer
       
    33 * in the documentation and/or other materials provided with the
       
    34 * distribution.
       
    35 *
       
    36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
       
    37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
       
    38 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
       
    39 * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
       
    40 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
       
    41 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
       
    42 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
       
    43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
       
    44 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
       
    45 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
       
    46 * DAMAGE.
       
    47 *
       
    48 * @category
       
    49 * @package     Services_JSON
       
    50 * @author      Michal Migurski <mike-json@teczno.com>
       
    51 * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
       
    52 * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
       
    53 * @copyright   2005 Michal Migurski
       
    54 * @version     CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
       
    55 * @license     http://www.opensource.org/licenses/bsd-license.php
       
    56 * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
       
    57 */
       
    58 
       
    59 /**
       
    60 * Marker constant for Services_JSON::decode(), used to flag stack state
       
    61 */
       
    62 define('SERVICES_JSON_SLICE',   1);
       
    63 
       
    64 /**
       
    65 * Marker constant for Services_JSON::decode(), used to flag stack state
       
    66 */
       
    67 define('SERVICES_JSON_IN_STR',  2);
       
    68 
       
    69 /**
       
    70 * Marker constant for Services_JSON::decode(), used to flag stack state
       
    71 */
       
    72 define('SERVICES_JSON_IN_ARR',  3);
       
    73 
       
    74 /**
       
    75 * Marker constant for Services_JSON::decode(), used to flag stack state
       
    76 */
       
    77 define('SERVICES_JSON_IN_OBJ',  4);
       
    78 
       
    79 /**
       
    80 * Marker constant for Services_JSON::decode(), used to flag stack state
       
    81 */
       
    82 define('SERVICES_JSON_IN_CMT', 5);
       
    83 
       
    84 /**
       
    85 * Behavior switch for Services_JSON::decode()
       
    86 */
       
    87 define('SERVICES_JSON_LOOSE_TYPE', 16);
       
    88 
       
    89 /**
       
    90 * Behavior switch for Services_JSON::decode()
       
    91 */
       
    92 define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
       
    93 
       
    94 /**
       
    95  * Converts to and from JSON format.
       
    96  *
       
    97  * Brief example of use:
       
    98  *
       
    99  * <code>
       
   100    // create a new instance of Services_JSON
       
   101    $json = new Services_JSON();
       
   102   
       
   103    // convert a complexe value to JSON notation, and send it to the browser
       
   104    $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
       
   105    $output = $json->encode($value);
       
   106   
       
   107    print($output);
       
   108    // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
       
   109   
       
   110    // accept incoming POST data, assumed to be in JSON notation
       
   111    $input = file_get_contents('php://input', 1000000);
       
   112    $value = $json->decode($input);
       
   113    </code>
       
   114  */
       
   115 class Services_JSON
       
   116 {
       
   117    /**
       
   118     * constructs a new JSON instance
       
   119     *
       
   120     * @param    int     $use    object behavior flags; combine with boolean-OR
       
   121     *
       
   122     *                           possible values:
       
   123     *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
       
   124     *                                   "{...}" syntax creates associative arrays
       
   125     *                                   instead of objects in decode().
       
   126     *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
       
   127     *                                   Values which can't be encoded (e.g. resources)
       
   128     *                                   appear as NULL instead of throwing errors.
       
   129     *                                   By default, a deeply-nested resource will
       
   130     *                                   bubble up with an error, so all return values
       
   131     *                                   from encode() should be checked with isError()
       
   132     */
       
   133     function Services_JSON($use = 0)
       
   134     {
       
   135         $this->use = $use;
       
   136     }
       
   137 
       
   138    /**
       
   139     * convert a string from one UTF-16 char to one UTF-8 char
       
   140     *
       
   141     * Normally should be handled by mb_convert_encoding, but
       
   142     * provides a slower PHP-only method for installations
       
   143     * that lack the multibye string extension.
       
   144     *
       
   145     * @param    string  $utf16  UTF-16 character
       
   146     * @return   string  UTF-8 character
       
   147     * @access   private
       
   148     */
       
   149     function utf162utf8($utf16)
       
   150     {
       
   151         // oh please oh please oh please oh please oh please
       
   152         if(function_exists('mb_convert_encoding')) {
       
   153             return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
       
   154         }
       
   155 
       
   156         $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
       
   157 
       
   158         switch(true) {
       
   159             case ((0x7F & $bytes) == $bytes):
       
   160                 // this case should never be reached, because we are in ASCII range
       
   161                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   162                 return chr(0x7F & $bytes);
       
   163 
       
   164             case (0x07FF & $bytes) == $bytes:
       
   165                 // return a 2-byte UTF-8 character
       
   166                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   167                 return chr(0xC0 | (($bytes >> 6) & 0x1F))
       
   168                      . chr(0x80 | ($bytes & 0x3F));
       
   169 
       
   170             case (0xFFFF & $bytes) == $bytes:
       
   171                 // return a 3-byte UTF-8 character
       
   172                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   173                 return chr(0xE0 | (($bytes >> 12) & 0x0F))
       
   174                      . chr(0x80 | (($bytes >> 6) & 0x3F))
       
   175                      . chr(0x80 | ($bytes & 0x3F));
       
   176         }
       
   177 
       
   178         // ignoring UTF-32 for now, sorry
       
   179         return '';
       
   180     }
       
   181 
       
   182    /**
       
   183     * convert a string from one UTF-8 char to one UTF-16 char
       
   184     *
       
   185     * Normally should be handled by mb_convert_encoding, but
       
   186     * provides a slower PHP-only method for installations
       
   187     * that lack the multibye string extension.
       
   188     *
       
   189     * @param    string  $utf8   UTF-8 character
       
   190     * @return   string  UTF-16 character
       
   191     * @access   private
       
   192     */
       
   193     function utf82utf16($utf8)
       
   194     {
       
   195         // oh please oh please oh please oh please oh please
       
   196         if(function_exists('mb_convert_encoding')) {
       
   197             return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
       
   198         }
       
   199 
       
   200         switch(strlen($utf8)) {
       
   201             case 1:
       
   202                 // this case should never be reached, because we are in ASCII range
       
   203                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   204                 return $utf8;
       
   205 
       
   206             case 2:
       
   207                 // return a UTF-16 character from a 2-byte UTF-8 char
       
   208                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   209                 return chr(0x07 & (ord($utf8{0}) >> 2))
       
   210                      . chr((0xC0 & (ord($utf8{0}) << 6))
       
   211                          | (0x3F & ord($utf8{1})));
       
   212 
       
   213             case 3:
       
   214                 // return a UTF-16 character from a 3-byte UTF-8 char
       
   215                 // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   216                 return chr((0xF0 & (ord($utf8{0}) << 4))
       
   217                          | (0x0F & (ord($utf8{1}) >> 2)))
       
   218                      . chr((0xC0 & (ord($utf8{1}) << 6))
       
   219                          | (0x7F & ord($utf8{2})));
       
   220         }
       
   221 
       
   222         // ignoring UTF-32 for now, sorry
       
   223         return '';
       
   224     }
       
   225 
       
   226    /**
       
   227     * encodes an arbitrary variable into JSON format
       
   228     *
       
   229     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
       
   230     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
       
   231     *                           if var is a strng, note that encode() always expects it
       
   232     *                           to be in ASCII or UTF-8 format!
       
   233     *
       
   234     * @return   mixed   JSON string representation of input var or an error if a problem occurs
       
   235     * @access   public
       
   236     */
       
   237     function encode($var)
       
   238     {
       
   239         switch (gettype($var)) {
       
   240             case 'boolean':
       
   241                 return $var ? 'true' : 'false';
       
   242 
       
   243             case 'NULL':
       
   244                 return 'null';
       
   245 
       
   246             case 'integer':
       
   247                 return (int) $var;
       
   248 
       
   249             case 'double':
       
   250             case 'float':
       
   251                 return (float) $var;
       
   252 
       
   253             case 'string':
       
   254                 // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
       
   255                 $ascii = '';
       
   256                 $strlen_var = strlen($var);
       
   257 
       
   258                /*
       
   259                 * Iterate over every character in the string,
       
   260                 * escaping with a slash or encoding to UTF-8 where necessary
       
   261                 */
       
   262                 for ($c = 0; $c < $strlen_var; ++$c) {
       
   263 
       
   264                     $ord_var_c = ord($var{$c});
       
   265 
       
   266                     switch (true) {
       
   267                         case $ord_var_c == 0x08:
       
   268                             $ascii .= '\b';
       
   269                             break;
       
   270                         case $ord_var_c == 0x09:
       
   271                             $ascii .= '\t';
       
   272                             break;
       
   273                         case $ord_var_c == 0x0A:
       
   274                             $ascii .= '\n';
       
   275                             break;
       
   276                         case $ord_var_c == 0x0C:
       
   277                             $ascii .= '\f';
       
   278                             break;
       
   279                         case $ord_var_c == 0x0D:
       
   280                             $ascii .= '\r';
       
   281                             break;
       
   282 
       
   283                         case $ord_var_c == 0x22:
       
   284                         case $ord_var_c == 0x2F:
       
   285                         case $ord_var_c == 0x5C:
       
   286                             // double quote, slash, slosh
       
   287                             $ascii .= '\\'.$var{$c};
       
   288                             break;
       
   289 
       
   290                         case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
       
   291                             // characters U-00000000 - U-0000007F (same as ASCII)
       
   292                             $ascii .= $var{$c};
       
   293                             break;
       
   294 
       
   295                         case (($ord_var_c & 0xE0) == 0xC0):
       
   296                             // characters U-00000080 - U-000007FF, mask 110XXXXX
       
   297                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   298                             $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
       
   299                             $c += 1;
       
   300                             $utf16 = $this->utf82utf16($char);
       
   301                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
       
   302                             break;
       
   303 
       
   304                         case (($ord_var_c & 0xF0) == 0xE0):
       
   305                             // characters U-00000800 - U-0000FFFF, mask 1110XXXX
       
   306                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   307                             $char = pack('C*', $ord_var_c,
       
   308                                          ord($var{$c + 1}),
       
   309                                          ord($var{$c + 2}));
       
   310                             $c += 2;
       
   311                             $utf16 = $this->utf82utf16($char);
       
   312                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
       
   313                             break;
       
   314 
       
   315                         case (($ord_var_c & 0xF8) == 0xF0):
       
   316                             // characters U-00010000 - U-001FFFFF, mask 11110XXX
       
   317                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   318                             $char = pack('C*', $ord_var_c,
       
   319                                          ord($var{$c + 1}),
       
   320                                          ord($var{$c + 2}),
       
   321                                          ord($var{$c + 3}));
       
   322                             $c += 3;
       
   323                             $utf16 = $this->utf82utf16($char);
       
   324                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
       
   325                             break;
       
   326 
       
   327                         case (($ord_var_c & 0xFC) == 0xF8):
       
   328                             // characters U-00200000 - U-03FFFFFF, mask 111110XX
       
   329                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   330                             $char = pack('C*', $ord_var_c,
       
   331                                          ord($var{$c + 1}),
       
   332                                          ord($var{$c + 2}),
       
   333                                          ord($var{$c + 3}),
       
   334                                          ord($var{$c + 4}));
       
   335                             $c += 4;
       
   336                             $utf16 = $this->utf82utf16($char);
       
   337                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
       
   338                             break;
       
   339 
       
   340                         case (($ord_var_c & 0xFE) == 0xFC):
       
   341                             // characters U-04000000 - U-7FFFFFFF, mask 1111110X
       
   342                             // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   343                             $char = pack('C*', $ord_var_c,
       
   344                                          ord($var{$c + 1}),
       
   345                                          ord($var{$c + 2}),
       
   346                                          ord($var{$c + 3}),
       
   347                                          ord($var{$c + 4}),
       
   348                                          ord($var{$c + 5}));
       
   349                             $c += 5;
       
   350                             $utf16 = $this->utf82utf16($char);
       
   351                             $ascii .= sprintf('\u%04s', bin2hex($utf16));
       
   352                             break;
       
   353                     }
       
   354                 }
       
   355 
       
   356                 return '"'.$ascii.'"';
       
   357 
       
   358             case 'array':
       
   359                /*
       
   360                 * As per JSON spec if any array key is not an integer
       
   361                 * we must treat the the whole array as an object. We
       
   362                 * also try to catch a sparsely populated associative
       
   363                 * array with numeric keys here because some JS engines
       
   364                 * will create an array with empty indexes up to
       
   365                 * max_index which can cause memory issues and because
       
   366                 * the keys, which may be relevant, will be remapped
       
   367                 * otherwise.
       
   368                 *
       
   369                 * As per the ECMA and JSON specification an object may
       
   370                 * have any string as a property. Unfortunately due to
       
   371                 * a hole in the ECMA specification if the key is a
       
   372                 * ECMA reserved word or starts with a digit the
       
   373                 * parameter is only accessible using ECMAScript's
       
   374                 * bracket notation.
       
   375                 */
       
   376 
       
   377                 // treat as a JSON object
       
   378                 if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
       
   379                     $properties = array_map(array($this, 'name_value'),
       
   380                                             array_keys($var),
       
   381                                             array_values($var));
       
   382 
       
   383                     foreach($properties as $property) {
       
   384                         if(Services_JSON::isError($property)) {
       
   385                             return $property;
       
   386                         }
       
   387                     }
       
   388 
       
   389                     return '{' . join(',', $properties) . '}';
       
   390                 }
       
   391 
       
   392                 // treat it like a regular array
       
   393                 $elements = array_map(array($this, 'encode'), $var);
       
   394 
       
   395                 foreach($elements as $element) {
       
   396                     if(Services_JSON::isError($element)) {
       
   397                         return $element;
       
   398                     }
       
   399                 }
       
   400 
       
   401                 return '[' . join(',', $elements) . ']';
       
   402 
       
   403             case 'object':
       
   404                 $vars = get_object_vars($var);
       
   405 
       
   406                 $properties = array_map(array($this, 'name_value'),
       
   407                                         array_keys($vars),
       
   408                                         array_values($vars));
       
   409 
       
   410                 foreach($properties as $property) {
       
   411                     if(Services_JSON::isError($property)) {
       
   412                         return $property;
       
   413                     }
       
   414                 }
       
   415 
       
   416                 return '{' . join(',', $properties) . '}';
       
   417 
       
   418             default:
       
   419                 return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
       
   420                     ? 'null'
       
   421                     : new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
       
   422         }
       
   423     }
       
   424 
       
   425    /**
       
   426     * array-walking function for use in generating JSON-formatted name-value pairs
       
   427     *
       
   428     * @param    string  $name   name of key to use
       
   429     * @param    mixed   $value  reference to an array element to be encoded
       
   430     *
       
   431     * @return   string  JSON-formatted name-value pair, like '"name":value'
       
   432     * @access   private
       
   433     */
       
   434     function name_value($name, $value)
       
   435     {
       
   436         $encoded_value = $this->encode($value);
       
   437 
       
   438         if(Services_JSON::isError($encoded_value)) {
       
   439             return $encoded_value;
       
   440         }
       
   441 
       
   442         return $this->encode(strval($name)) . ':' . $encoded_value;
       
   443     }
       
   444 
       
   445    /**
       
   446     * reduce a string by removing leading and trailing comments and whitespace
       
   447     *
       
   448     * @param    $str    string      string value to strip of comments and whitespace
       
   449     *
       
   450     * @return   string  string value stripped of comments and whitespace
       
   451     * @access   private
       
   452     */
       
   453     function reduce_string($str)
       
   454     {
       
   455         $str = preg_replace(array(
       
   456 
       
   457                 // eliminate single line comments in '// ...' form
       
   458                 '#^\s*//(.+)$#m',
       
   459 
       
   460                 // eliminate multi-line comments in '/* ... */' form, at start of string
       
   461                 '#^\s*/\*(.+)\*/#Us',
       
   462 
       
   463                 // eliminate multi-line comments in '/* ... */' form, at end of string
       
   464                 '#/\*(.+)\*/\s*$#Us'
       
   465 
       
   466             ), '', $str);
       
   467 
       
   468         // eliminate extraneous space
       
   469         return trim($str);
       
   470     }
       
   471 
       
   472    /**
       
   473     * decodes a JSON string into appropriate variable
       
   474     *
       
   475     * @param    string  $str    JSON-formatted string
       
   476     *
       
   477     * @return   mixed   number, boolean, string, array, or object
       
   478     *                   corresponding to given JSON input string.
       
   479     *                   See argument 1 to Services_JSON() above for object-output behavior.
       
   480     *                   Note that decode() always returns strings
       
   481     *                   in ASCII or UTF-8 format!
       
   482     * @access   public
       
   483     */
       
   484     function decode($str)
       
   485     {
       
   486         $str = $this->reduce_string($str);
       
   487 
       
   488         switch (strtolower($str)) {
       
   489             case 'true':
       
   490                 return true;
       
   491 
       
   492             case 'false':
       
   493                 return false;
       
   494 
       
   495             case 'null':
       
   496                 return null;
       
   497 
       
   498             default:
       
   499                 $m = array();
       
   500 
       
   501                 if (is_numeric($str)) {
       
   502                     // Lookie-loo, it's a number
       
   503 
       
   504                     // This would work on its own, but I'm trying to be
       
   505                     // good about returning integers where appropriate:
       
   506                     // return (float)$str;
       
   507 
       
   508                     // Return float or int, as appropriate
       
   509                     return ((float)$str == (integer)$str)
       
   510                         ? (integer)$str
       
   511                         : (float)$str;
       
   512 
       
   513                 } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
       
   514                     // STRINGS RETURNED IN UTF-8 FORMAT
       
   515                     $delim = substr($str, 0, 1);
       
   516                     $chrs = substr($str, 1, -1);
       
   517                     $utf8 = '';
       
   518                     $strlen_chrs = strlen($chrs);
       
   519 
       
   520                     for ($c = 0; $c < $strlen_chrs; ++$c) {
       
   521 
       
   522                         $substr_chrs_c_2 = substr($chrs, $c, 2);
       
   523                         $ord_chrs_c = ord($chrs{$c});
       
   524 
       
   525                         switch (true) {
       
   526                             case $substr_chrs_c_2 == '\b':
       
   527                                 $utf8 .= chr(0x08);
       
   528                                 ++$c;
       
   529                                 break;
       
   530                             case $substr_chrs_c_2 == '\t':
       
   531                                 $utf8 .= chr(0x09);
       
   532                                 ++$c;
       
   533                                 break;
       
   534                             case $substr_chrs_c_2 == '\n':
       
   535                                 $utf8 .= chr(0x0A);
       
   536                                 ++$c;
       
   537                                 break;
       
   538                             case $substr_chrs_c_2 == '\f':
       
   539                                 $utf8 .= chr(0x0C);
       
   540                                 ++$c;
       
   541                                 break;
       
   542                             case $substr_chrs_c_2 == '\r':
       
   543                                 $utf8 .= chr(0x0D);
       
   544                                 ++$c;
       
   545                                 break;
       
   546 
       
   547                             case $substr_chrs_c_2 == '\\"':
       
   548                             case $substr_chrs_c_2 == '\\\'':
       
   549                             case $substr_chrs_c_2 == '\\\\':
       
   550                             case $substr_chrs_c_2 == '\\/':
       
   551                                 if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
       
   552                                    ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
       
   553                                     $utf8 .= $chrs{++$c};
       
   554                                 }
       
   555                                 break;
       
   556 
       
   557                             case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
       
   558                                 // single, escaped unicode character
       
   559                                 $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
       
   560                                        . chr(hexdec(substr($chrs, ($c + 4), 2)));
       
   561                                 $utf8 .= $this->utf162utf8($utf16);
       
   562                                 $c += 5;
       
   563                                 break;
       
   564 
       
   565                             case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
       
   566                                 $utf8 .= $chrs{$c};
       
   567                                 break;
       
   568 
       
   569                             case ($ord_chrs_c & 0xE0) == 0xC0:
       
   570                                 // characters U-00000080 - U-000007FF, mask 110XXXXX
       
   571                                 //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   572                                 $utf8 .= substr($chrs, $c, 2);
       
   573                                 ++$c;
       
   574                                 break;
       
   575 
       
   576                             case ($ord_chrs_c & 0xF0) == 0xE0:
       
   577                                 // characters U-00000800 - U-0000FFFF, mask 1110XXXX
       
   578                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   579                                 $utf8 .= substr($chrs, $c, 3);
       
   580                                 $c += 2;
       
   581                                 break;
       
   582 
       
   583                             case ($ord_chrs_c & 0xF8) == 0xF0:
       
   584                                 // characters U-00010000 - U-001FFFFF, mask 11110XXX
       
   585                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   586                                 $utf8 .= substr($chrs, $c, 4);
       
   587                                 $c += 3;
       
   588                                 break;
       
   589 
       
   590                             case ($ord_chrs_c & 0xFC) == 0xF8:
       
   591                                 // characters U-00200000 - U-03FFFFFF, mask 111110XX
       
   592                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   593                                 $utf8 .= substr($chrs, $c, 5);
       
   594                                 $c += 4;
       
   595                                 break;
       
   596 
       
   597                             case ($ord_chrs_c & 0xFE) == 0xFC:
       
   598                                 // characters U-04000000 - U-7FFFFFFF, mask 1111110X
       
   599                                 // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
       
   600                                 $utf8 .= substr($chrs, $c, 6);
       
   601                                 $c += 5;
       
   602                                 break;
       
   603 
       
   604                         }
       
   605 
       
   606                     }
       
   607 
       
   608                     return $utf8;
       
   609 
       
   610                 } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
       
   611                     // array, or object notation
       
   612 
       
   613                     if ($str{0} == '[') {
       
   614                         $stk = array(SERVICES_JSON_IN_ARR);
       
   615                         $arr = array();
       
   616                     } else {
       
   617                         if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
       
   618                             $stk = array(SERVICES_JSON_IN_OBJ);
       
   619                             $obj = array();
       
   620                         } else {
       
   621                             $stk = array(SERVICES_JSON_IN_OBJ);
       
   622                             $obj = new stdClass();
       
   623                         }
       
   624                     }
       
   625 
       
   626                     array_push($stk, array('what'  => SERVICES_JSON_SLICE,
       
   627                                            'where' => 0,
       
   628                                            'delim' => false));
       
   629 
       
   630                     $chrs = substr($str, 1, -1);
       
   631                     $chrs = $this->reduce_string($chrs);
       
   632 
       
   633                     if ($chrs == '') {
       
   634                         if (reset($stk) == SERVICES_JSON_IN_ARR) {
       
   635                             return $arr;
       
   636 
       
   637                         } else {
       
   638                             return $obj;
       
   639 
       
   640                         }
       
   641                     }
       
   642 
       
   643                     //print("\nparsing {$chrs}\n");
       
   644 
       
   645                     $strlen_chrs = strlen($chrs);
       
   646 
       
   647                     for ($c = 0; $c <= $strlen_chrs; ++$c) {
       
   648 
       
   649                         $top = end($stk);
       
   650                         $substr_chrs_c_2 = substr($chrs, $c, 2);
       
   651 
       
   652                         if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
       
   653                             // found a comma that is not inside a string, array, etc.,
       
   654                             // OR we've reached the end of the character list
       
   655                             $slice = substr($chrs, $top['where'], ($c - $top['where']));
       
   656                             array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
       
   657                             //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
       
   658 
       
   659                             if (reset($stk) == SERVICES_JSON_IN_ARR) {
       
   660                                 // we are in an array, so just push an element onto the stack
       
   661                                 array_push($arr, $this->decode($slice));
       
   662 
       
   663                             } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
       
   664                                 // we are in an object, so figure
       
   665                                 // out the property name and set an
       
   666                                 // element in an associative array,
       
   667                                 // for now
       
   668                                 $parts = array();
       
   669                                 
       
   670                                 if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
       
   671                                     // "name":value pair
       
   672                                     $key = $this->decode($parts[1]);
       
   673                                     $val = $this->decode($parts[2]);
       
   674 
       
   675                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
       
   676                                         $obj[$key] = $val;
       
   677                                     } else {
       
   678                                         $obj->$key = $val;
       
   679                                     }
       
   680                                 } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
       
   681                                     // name:value pair, where name is unquoted
       
   682                                     $key = $parts[1];
       
   683                                     $val = $this->decode($parts[2]);
       
   684 
       
   685                                     if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
       
   686                                         $obj[$key] = $val;
       
   687                                     } else {
       
   688                                         $obj->$key = $val;
       
   689                                     }
       
   690                                 }
       
   691 
       
   692                             }
       
   693 
       
   694                         } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
       
   695                             // found a quote, and we are not inside a string
       
   696                             array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
       
   697                             //print("Found start of string at {$c}\n");
       
   698 
       
   699                         } elseif (($chrs{$c} == $top['delim']) &&
       
   700                                  ($top['what'] == SERVICES_JSON_IN_STR) &&
       
   701                                  ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
       
   702                             // found a quote, we're in a string, and it's not escaped
       
   703                             // we know that it's not escaped becase there is _not_ an
       
   704                             // odd number of backslashes at the end of the string so far
       
   705                             array_pop($stk);
       
   706                             //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
       
   707 
       
   708                         } elseif (($chrs{$c} == '[') &&
       
   709                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
       
   710                             // found a left-bracket, and we are in an array, object, or slice
       
   711                             array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
       
   712                             //print("Found start of array at {$c}\n");
       
   713 
       
   714                         } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
       
   715                             // found a right-bracket, and we're in an array
       
   716                             array_pop($stk);
       
   717                             //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
       
   718 
       
   719                         } elseif (($chrs{$c} == '{') &&
       
   720                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
       
   721                             // found a left-brace, and we are in an array, object, or slice
       
   722                             array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
       
   723                             //print("Found start of object at {$c}\n");
       
   724 
       
   725                         } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
       
   726                             // found a right-brace, and we're in an object
       
   727                             array_pop($stk);
       
   728                             //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
       
   729 
       
   730                         } elseif (($substr_chrs_c_2 == '/*') &&
       
   731                                  in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
       
   732                             // found a comment start, and we are in an array, object, or slice
       
   733                             array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
       
   734                             $c++;
       
   735                             //print("Found start of comment at {$c}\n");
       
   736 
       
   737                         } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
       
   738                             // found a comment end, and we're in one now
       
   739                             array_pop($stk);
       
   740                             $c++;
       
   741 
       
   742                             for ($i = $top['where']; $i <= $c; ++$i)
       
   743                                 $chrs = substr_replace($chrs, ' ', $i, 1);
       
   744 
       
   745                             //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
       
   746 
       
   747                         }
       
   748 
       
   749                     }
       
   750 
       
   751                     if (reset($stk) == SERVICES_JSON_IN_ARR) {
       
   752                         return $arr;
       
   753 
       
   754                     } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
       
   755                         return $obj;
       
   756 
       
   757                     }
       
   758 
       
   759                 }
       
   760         }
       
   761     }
       
   762 
       
   763     /**
       
   764      * @todo Ultimately, this should just call PEAR::isError()
       
   765      */
       
   766     function isError($data, $code = null)
       
   767     {
       
   768         if (class_exists('pear')) {
       
   769             return PEAR::isError($data, $code);
       
   770         } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
       
   771                                  is_subclass_of($data, 'services_json_error'))) {
       
   772             return true;
       
   773         }
       
   774 
       
   775         return false;
       
   776     }
       
   777 }
       
   778 
       
   779 if (class_exists('PEAR_Error')) {
       
   780 
       
   781     class Services_JSON_Error extends PEAR_Error
       
   782     {
       
   783         function Services_JSON_Error($message = 'unknown error', $code = null,
       
   784                                      $mode = null, $options = null, $userinfo = null)
       
   785         {
       
   786             parent::PEAR_Error($message, $code, $mode, $options, $userinfo);
       
   787         }
       
   788     }
       
   789 
       
   790 } else {
       
   791 
       
   792     /**
       
   793      * @todo Ultimately, this class shall be descended from PEAR_Error
       
   794      */
       
   795     class Services_JSON_Error
       
   796     {
       
   797         function Services_JSON_Error($message = 'unknown error', $code = null,
       
   798                                      $mode = null, $options = null, $userinfo = null)
       
   799         {
       
   800 
       
   801         }
       
   802     }
       
   803 
       
   804 }
       
   805     
       
   806 ?>