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function Services_JSON::decode in Video 7

decodes a JSON string into appropriate variable

@access public

Parameters

string $str JSON-formatted string:

Return value

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!

File

modules/video_zencoder/includes/lib/JSON.php, line 483

Class

Services_JSON
Converts to and from JSON format.

Code

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 (double) $str == (int) $str ? (int) $str : (double) $str;
      }
      elseif (preg_match('/^("|\').*(\\1)$/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':
              $utf8 .= chr(0x8);
              ++$c;
              break;
            case $substr_chrs_c_2 == '\\t':
              $utf8 .= chr(0x9);
              ++$c;
              break;
            case $substr_chrs_c_2 == '\\n':
              $utf8 .= chr(0xa);
              ++$c;
              break;
            case $substr_chrs_c_2 == '\\f':
              $utf8 .= chr(0xc);
              ++$c;
              break;
            case $substr_chrs_c_2 == '\\r':
              $utf8 .= chr(0xd);
              ++$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;
        }
      }
  }
}