topical media & game development
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professional-ajax-07-Autosuggest-Example-JSON.php / php



  <?php
      // +----------------------------------------------------------------------+
      // | PHP version 4                                                        |
      // +----------------------------------------------------------------------+
      // | Copyright (c) 2005 Michal Migurski                                   |
      // +----------------------------------------------------------------------+
      // | This source file is subject to version 3.0 of the PHP license,       |
      // | that is bundled with this package in the file LICENSE, and is        |
      // | available through the world-wide-web at the following url:           |
      // | http://www.php.net/license/3_0.txt.                                  |
      // | If you did not receive a copy of the PHP license and are unable to   |
      // | obtain it through the world-wide-web, please send a note to          |
      // | license@php.net so we can mail you a copy immediately.               |
      // +----------------------------------------------------------------------+
      // | Author: Michal Migurski, mike-json[at]teczno[dot]com                 |
      // | with contributions from:                                             |
      // |   Matt Knapp, mdknapp[at]gmail[dot]com                               |
      // |   Brett Stimmerman, brettstimmerman[at]gmail[dot]com                 |
      // +----------------------------------------------------------------------+
      //
      // Id: JSON.php,v 1.16 2005/06/19 00:46:05 migurski Exp 
      /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
  
      define('JSON_SLICE',   1);
      define('JSON_IN_STR',  2);
      define('JSON_IN_ARR',  4);
      define('JSON_IN_OBJ',  8);
      define('JSON_IN_CMT', 16);
      define('JSON_LOOSE_TYPE', 10);
      define('JSON_STRICT_TYPE', 11);
JSON Conversion to and from JSON format. See http://json.org for details. note all strings should be in ASCII or UTF-8 format! 

  
      class JSON
      {
function JSON constructor
parameter: use int object behavior: when encoding or decoding, be loose or strict about object/array usage possible values: JSON_STRICT_TYPE - strict typing, default "{...}" syntax creates objects in decode JSON_LOOSE_TYPE - loose typing "{...}" syntax creates associative arrays in decode 

  
          function JSON(use=JSON_STRICT_TYPE)
          {
              this->use = use;
          }
function encode encode an arbitrary variable into JSON format
parameter: var mixed any number, boolean, string, array, or object to be encoded. see argument 1 to 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!
returns: string JSON string representation of input var 

  
          function encode(var)
          {
              switch(gettype(var)) {
                  case 'boolean':
                      return var ? 'true' : 'false';
                  
                  case 'NULL':
                      return 'null';
                  
                  case 'integer':
                      return sprintf('\%d', var);
                      
                  case 'double':
                  case 'float':
                      return sprintf('\%f', var);
                      
                  case 'string': // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                      ascii = '';
                      strlen_var = strlen(var);
      
                      for(c = 0; c < strlen_var; c++) {
                          
                          ord_var_c = ord(var{c});
                  
                          if(ord_var_c == 0x08) {
                              ascii .= '\b';
                          
                          } elseif(ord_var_c == 0x09) {
                              ascii .= '\t';
                          
                          } elseif(ord_var_c == 0x0A) {
                              ascii .= '\n';
                          
                          } elseif(ord_var_c == 0x0C) {
                              ascii .= '\f';
                          
                          } elseif(ord_var_c == 0x0D) {
                              ascii .= '\r';
                          
                          } elseif((ord_var_c == 0x22) || (ord_var_c == 0x2F) || (ord_var_c == 0x5C)) {
                              ascii .= '\\'.var{c}; // double quote, slash, slosh
                          
                          } elseif((ord_var_c >= 0x20) && (ord_var_c <= 0x7F)) {
                              // characters U-00000000 - U-0000007F (same as ASCII)
                              ascii .= var{c}; // most normal ASCII chars
                  
                          } elseif((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;
                              ascii .= sprintf('\u%04s', bin2hex(mb_convert_encoding(char, 'UTF-16', 'UTF-8')));
      
                          } elseif((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;
                              ascii .= sprintf('\u%04s', bin2hex(mb_convert_encoding(char, 'UTF-16', 'UTF-8')));
      
                          } elseif((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;
                              ascii .= sprintf('\u%04s', bin2hex(mb_convert_encoding(char, 'UTF-16', 'UTF-8')));
      
                          } elseif((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;
                              ascii .= sprintf('\u%04s', bin2hex(mb_convert_encoding(char, 'UTF-16', 'UTF-8')));
      
                          } elseif((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;
                              ascii .= sprintf('\u%04s', bin2hex(mb_convert_encoding(char, 'UTF-16', 'UTF-8')));
      
                          }
                      }
                      
                      return sprintf('"\%s"', 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) > 0 &&  (array_keys(var) !== range(0, sizeof(var) - 1))) {
                          return sprintf('{\%s}', join(',', array_map(array(this, 'name_value'), array_keys(var), array_values(var))));
                       }
                      // treat it like a regular array
                      return sprintf('[\%s]', join(',', array_map(array(this, 'encode'), var)));
                      
                  case 'object':
                      vars = get_object_vars(var);
                      return sprintf('{\%s}', join(',', array_map(array(this, 'name_value'), array_keys(vars), array_values(vars))));                    
  
                  default:
                      return '';
              }
          }
function enc alias for encode() 

  
          function enc(var)
          {
              return this->encode(var);
          }
function name_value array-walking function for use in generating JSON-formatted name-value pairs
parameter: name string name of key to use
parameter: value mixed reference to an array element to be encoded
returns: string JSON-formatted name-value pair, like '"name":value' 

  
          function name_value(name, value)
          {
              return (sprintf("\%s:\%s", this->encode(strval(name)), this->encode(value)));
          }
function reduce_string reduce a string by removing leading and trailing comments and whitespace
parameter: str string string value to strip of comments and whitespace
returns: string string value stripped of comments and whitespace 

  
          function reduce_string(str)
          {
              str = preg_replace('#^\s*//(.+)#m', '', str); // eliminate single line comments in '// ...' form
              str = preg_replace('#^\s*/\*(.+)\*/#Us', '', str); // eliminate multi-line comments in '/* ... */' form, at start of string
              str = preg_replace('#/\*(.+)\*/\s*#Us', '', str); // eliminate multi-line comments in '/* ... */' form, at end of string
              str = trim(str); // eliminate extraneous space
              
              return str;
          }
function decode decode a JSON string into appropriate variable
parameter: str string JSON-formatted string
returns: mixed number, boolean, string, array, or object corresponding to given JSON input string. see argument 1 to JSON() above for object-output behavior. note that decode() always returns strings in ASCII or UTF-8 format! 

  
          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
                          // return (float)str; // This would work on its own, but I'm trying to be good about returning integers where appropriate
                          return ((float)str == (integer)str)
                              ? (integer)str
                              : (float)str;
                          
                      } elseif(preg_match('/^".+"/s', str) || preg_match('/^\'.+\'/s', str)) { // 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});
  
                              if(substr_chrs_c_2 == '\b') {
                                  utf8 .= chr(0x08); c+=1;
      
                              } elseif(substr_chrs_c_2 == '\t') {
                                  utf8 .= chr(0x09); c+=1;
      
                              } elseif(substr_chrs_c_2 == '\n') {
                                  utf8 .= chr(0x0A); c+=1;
      
                              } elseif(substr_chrs_c_2 == '\f') {
                                  utf8 .= chr(0x0C); c+=1;
      
                              } elseif(substr_chrs_c_2 == '\r') {
                                  utf8 .= chr(0x0D); c+=1;
      
                              } elseif((delim == '"') && ((substr_chrs_c_2 == '\\"') || (substr_chrs_c_2 == '\\\\') || (substr_chrs_c_2 == '\\/'))) {
                                  utf8 .= chrs{++c};
      
                              } elseif((delim == "'") && ((substr_chrs_c_2 == '\\\'') || (substr_chrs_c_2 == '\\\\') || (substr_chrs_c_2 == '\\/'))) {
                                  utf8 .= chrs{++c};
      
                              } elseif(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 .= mb_convert_encoding(utf16, 'UTF-8', 'UTF-16');
                                  c+=5;
      
                              } elseif((ord_chrs_c >= 0x20) && (ord_chrs_c <= 0x7F)) {
                                  utf8 .= chrs{c};
      
                              } elseif((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 += 1;
  
                              } elseif((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;
  
                              } elseif((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;
  
                              } elseif((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;
  
                              } elseif((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;
  
                              }
                          
                          }
                          
                          return utf8;
                      
                      } elseif(preg_match('/^\[.*\]/s', str) || preg_match('/^{.*}/s', str)) { // array, or object notation
      
                          if(str{0} == '[') {
                              stk = array(JSON_IN_ARR);
                              arr = array();
                          } else {
                              if(this->use == JSON_LOOSE_TYPE) {
                                  stk = array(JSON_IN_OBJ);
                                  obj = array();
                              } else {
                                  stk = array(JSON_IN_OBJ);
                                  obj = new ObjectFromJSON();
                              }
                          }
                          
                          array_push(stk, array('what' => JSON_SLICE, 'where' => 0, 'delim' => false));
                          chrs = substr(str, 1, -1);
                          chrs = this->reduce_string(chrs);
                          
                          if(chrs == '') {
                              if(reset(stk) == 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'] == 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' => JSON_SLICE, 'where' => (c + 1), 'delim' => false));
                                  //print("Found split at {c}: ".substr(chrs, top['where'], (1 + c - top['where']))."\n");
      
                                  if(reset(stk) == 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) == 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 == 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 == JSON_LOOSE_TYPE) {
                                              obj[key] = val;
                                          } else {
                                              obj->key = val;
                                          }
                                      }
      
                                  }
      
                              } elseif(((chrs{c} == '"') || (chrs{c} == "'")) && (top['what'] != JSON_IN_STR)) { // found a quote, and we are not inside a string
                                  array_push(stk, array('what' => JSON_IN_STR, 'where' => c, 'delim' => chrs{c}));
                                  //print("Found start of string at {c}\n");
      
                              } elseif((chrs{c} == top['delim']) && (top['what'] == 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(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) { // found a left-bracket, and we are in an array, object, or slice
                                  array_push(stk, array('what' => JSON_IN_ARR, 'where' => c, 'delim' => false));
                                  //print("Found start of array at {c}\n");
      
                              } elseif((chrs{c} == ']') && (top['what'] == 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(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) { // found a left-brace, and we are in an array, object, or slice
                                  array_push(stk, array('what' => JSON_IN_OBJ, 'where' => c, 'delim' => false));
                                  //print("Found start of object at {c}\n");
      
                              } elseif((chrs{c} == '}') && (top['what'] == 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(JSON_SLICE, JSON_IN_ARR, JSON_IN_OBJ))) { // found a comment start, and we are in an array, object, or slice
                                  array_push(stk, array('what' => JSON_IN_CMT, 'where' => c, 'delim' => false));
                                  c++;
                                  //print("Found start of comment at {c}\n");
      
                              } elseif((substr_chrs_c_2 == '*/') && (top['what'] == 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) == JSON_IN_ARR) {
                              return arr;
      
                          } elseif(reset(stk) == JSON_IN_OBJ) {
                              return obj;
      
                          }
                      
                      }
              }
          }
function dec alias for decode() 

  
          function dec(var)
          {
              return this->decode(var);
          }
          
      }
ObjectFromJSON Generic object wrapper, used in object returns from decode() 

  
      class ObjectFromJSON { function ObjectFromJSON() {} }
      
  ?>
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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