src/javascript/JSON.js

   1 // in case we run on an implimentation that doesn't have "undefined";
   2 var undefined;
   3
   4 function Cast (obj, class_constructor) {
   5         try {
   6                 if (eval(class_constructor + '.prototype["class_name"]')) {
   7                         var template = eval("new " + class_constructor + "()");
   8                         // copy the methods over to 'obj'
   9                         for (var m in obj) {
  10                                 if (typeof(obj[m]) != 'undefined') {
  11                                         template[m] = obj[m];
  12                                 }
  13                         }
  14                         obj = template;
  15                 }
  16         } catch( E ) {
  17                 obj['class_name'] = function () { return class_constructor };
  18                 //dump( super_dump(E) + "\n");
  19         } finally {
  20                 return obj;
  21         }
  22 }
  23
  24 function JSON2js (json) {
  25         json = String(json).replace( /\/\*--\s*S\w*?\s*?\s+\w+\s*--\*\//g, 'Cast(');
  26         json = String(json).replace( /\/\*--\s*E\w*?\s*?\s+(\w+)\s*--\*\//g, ', "$1")');
  27         var obj;
  28         if (json != '') {
  29                 eval( 'obj = ' + json );
  30         }
  31         obj.toString = function () { return js2JSON(this) };
  32         return obj;
  33 }
  34
  35 function js2JSON(arg) {
  36 var i, o, u, v;
  37
  38         switch (typeof arg) {
  39                 case 'object':
  40                         if (arg) {
  41                                 if (arg.constructor == Array) {
  42                                         o = '';
  43                                         for (i = 0; i < arg.length; ++i) {
  44                                                 v = js2JSON(arg[i]);
  45                                                 if (o) {
  46                                                         o += ',';
  47                                                 }
  48                                                 if (v !== u) {
  49                                                         o += v;
  50                                                 } else {
  51                                                         o += 'null,';
  52                                                 }
  53                                         }
  54                                         return '[' + o + ']';
  55                                 } else if (typeof arg.toString != 'undefined') {
  56                                         o = '';
  57                                         for (i in arg) {
  58                                                 v = js2JSON(arg[i]);
  59                                                 if (v !== u) {
  60                                                         if (o) {
  61                                                                 o += ',';
  62                                                         }
  63                                                         o += js2JSON(i) + ':' + v;
  64                                                 }
  65                                         }
  66                                         var obj_start = '{';
  67                                         var obj_end = '}';
  68                                         try {
  69                                                 if ( arg.class_name() ) {
  70                                                         obj_start = '/*--S ' + arg.class_name() + '--*/{';
  71                                                         obj_end   = '}/*--E ' + arg.class_name() + '--*/';
  72                                                 }
  73                                         } catch( E ) {}
  74                                         o = obj_start + o + obj_end;
  75                                         return o;
  76                                 } else {
  77                                         return;
  78                                 }
  79                         }
  80                         return 'null';
  81                 case 'unknown':
  82                 case 'number':
  83                         return arg;
  84                 case 'undefined':
  85                 case 'function':
  86                         return u;
  87                 case 'string':
  88                 default:
  89                         return '"' + String(arg).replace(/(["\\])/g, '\\$1') + '"';
  90         }
  91 }