Built-in JSON support

src/v8natives.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 294 matching lines @@
 
 function BooleanValueOf() {
   // NOTE: Both Boolean objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
   if (!IS_BOOLEAN(this) && !%HasBooleanClass(this))
     throw new $TypeError('Boolean.prototype.valueOf is not generic');
   return %_ValueOf(this);
 }
 
 
+function BooleanToJSON(key) {
+  return CheckJSONPrimitive(this.valueOf());
+}
+
+
 // ----------------------------------------------------------------------------
 
 
 function SetupBoolean() {
   InstallFunctions($Boolean.prototype, DONT_ENUM, $Array(
     "toString", BooleanToString,
-    "valueOf", BooleanValueOf
+    "valueOf", BooleanValueOf,
+    "toJSON", BooleanToJSON
   ));
 }
 
 SetupBoolean();
 
 // ----------------------------------------------------------------------------
 // Number
 
 // Set the Number function and constructor.
 %SetCode($Number, function(x) {
@@ skipping 79 matching lines @@
   if (IS_UNDEFINED(precision)) return ToString(%_ValueOf(this));
   var p = TO_INTEGER(precision);
   if (p < 1 || p > 21) {
     throw new $RangeError("toPrecision() argument must be between 1 and 21");
   }
   var x = ToNumber(this);
   return %NumberToPrecision(x, p);
 }
 
 
+function CheckJSONPrimitive(val) {
+  if (!IsPrimitive(val))
+    throw MakeTypeError('result_not_primitive', ['toJSON', val]);
+  return val;
+}
+
+
+function NumberToJSON(key) {
+  return CheckJSONPrimitive(this.valueOf());
+}
+
+
 // ----------------------------------------------------------------------------
 
 function SetupNumber() {
   // Setup the constructor property on the Number prototype object.
   %SetProperty($Number.prototype, "constructor", $Number, DONT_ENUM);
 
   // ECMA-262 section 15.7.3.1.
   %SetProperty($Number,
                "MAX_VALUE",
                1.7976931348623157e+308,
@@ skipping 17 matching lines @@
                1/0,
                DONT_ENUM | DONT_DELETE | READ_ONLY);
 
   // Setup non-enumerable functions on the Number prototype object.
   InstallFunctions($Number.prototype, DONT_ENUM, $Array(
     "toString", NumberToString,
     "toLocaleString", NumberToLocaleString,
     "valueOf", NumberValueOf,
     "toFixed", NumberToFixed,
     "toExponential", NumberToExponential,
-    "toPrecision", NumberToPrecision
+    "toPrecision", NumberToPrecision,
+    "toJSON", NumberToJSON
   ));
 }
 
 SetupNumber();
 
 
 
 // ----------------------------------------------------------------------------
 // Function
 
@@ skipping 62 matching lines @@
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();