Fix regression in JSON serialization of RegExps.

test/mjsunit/json.js

 // Copyright 2009 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
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function GenericToJSONChecks(Constructor, value, alternative) {
-  var n1 = new Constructor(value);
-  n1.valueOf = function () { return alternative; };
-  assertEquals(alternative, n1.toJSON());
-  var n2 = new Constructor(value);
-  n2.valueOf = null;
-  assertThrows(function () { n2.toJSON(); }, TypeError);
-  var n3 = new Constructor(value);
-  n3.valueOf = function () { return {}; };
-  assertThrows(function () { n3.toJSON(); }, TypeError, 'result_not_primitive');
-  var n4 = new Constructor(value);
-  n4.valueOf = function () {
-    assertEquals(0, arguments.length);
-    assertEquals(this, n4);
-    return null;
-  };
-  assertEquals(null, n4.toJSON());
-}
-
-// Number toJSON
-assertEquals(3, (3).toJSON());
-assertEquals(3, (3).toJSON(true));
-assertEquals(4, (new Number(4)).toJSON());
-GenericToJSONChecks(Number, 5, 6);
-
-// Boolean toJSON
-assertEquals(true, (true).toJSON());
-assertEquals(true, (true).toJSON(false));
-assertEquals(false, (false).toJSON());
-assertEquals(true, (new Boolean(true)).toJSON());
-GenericToJSONChecks(Boolean, true, false);
-GenericToJSONChecks(Boolean, false, true);
-
-// String toJSON
-assertEquals("flot", "flot".toJSON());
-assertEquals("flot", "flot".toJSON(3));
-assertEquals("tolf", (new String("tolf")).toJSON());
-GenericToJSONChecks(String, "x", "y");
-
 // Date toJSON
 assertEquals("1970-01-01T00:00:00.000Z", new Date(0).toJSON());
 assertEquals("1979-01-11T08:00:00.000Z", new Date("1979-01-11 08:00 GMT").toJSON());
 assertEquals("2005-05-05T05:05:05.000Z", new Date("2005-05-05 05:05:05 GMT").toJSON());
 var n1 = new Date(10000);
 n1.toISOString = function () { return "foo"; };
 assertEquals("foo", n1.toJSON());
 var n2 = new Date(10001);
 n2.toISOString = null;
 assertThrows(function () { n2.toJSON(); }, TypeError);
-var n3 = new Date(10002);
-n3.toISOString = function () { return {}; };
-assertThrows(function () { n3.toJSON(); }, TypeError, "result_not_primitive");
 var n4 = new Date(10003);
 n4.toISOString = function () {
   assertEquals(0, arguments.length);
   assertEquals(this, n4);
   return null;
 };
 assertEquals(null, n4.toJSON());
 
 assertTrue(Object.prototype === JSON.__proto__);
 assertEquals("[object JSON]", Object.prototype.toString.call(JSON));
 
+//Test Date.prototype.toJSON as generic function.
+var d1 = {toJSON: Date.prototype.toJSON,
+         toISOString: function() { return 42; }};
+assertEquals(42, d1.toJSON());
+
+var d2 = {toJSON: Date.prototype.toJSON,
+          valueOf: function() { return Infinity; },
+          toISOString: function() { return 42; }};
+assertEquals(null, d2.toJSON());
+
+var d3 = {toJSON: Date.prototype.toJSON,
+          valueOf: "not callable",
+          toString: function() { return Infinity; },
+          toISOString: function() { return 42; }};
+
+assertEquals(null, d3.toJSON());
+
+var d4 = {toJSON: Date.prototype.toJSON,
+          valueOf: "not callable",
+          toString: "not callable either",
+          toISOString: function() { return 42; }};
+assertThrows("d4.toJSON()", TypeError);  // ToPrimitive throws. 
+
+var d5 = {toJSON: Date.prototype.toJSON,
+          valueOf: "not callable",
+          toString: function() { return "Infinity"; },
+          toISOString: function() { return 42; }};
+assertEquals(42, d5.toJSON());
+
+var d6 = {toJSON: Date.prototype.toJSON,
+          toISOString: function() { return ["not primitive"]; }};
+assertEquals(["not primitive"], d6.toJSON());
+
+var d7 = {toJSON: Date.prototype.toJSON,
+          ISOString: "not callable"};
+assertThrows("d7.toJSON()", TypeError);
+
 // DontEnum
-for (var p in this)
+for (var p in this) {
   assertFalse(p == "JSON");
+}
 
 // Parse
 assertEquals({}, JSON.parse("{}"));
 assertEquals({42:37}, JSON.parse('{"42":37}'));
 assertEquals(null, JSON.parse("null"));
 assertEquals(true, JSON.parse("true"));
 assertEquals(false, JSON.parse("false"));
 assertEquals("foo", JSON.parse('"foo"'));
 assertEquals("f\no", JSON.parse('"f\\no"'));
 assertEquals("\b\f\n\r\t\"\u2028\/\\",
@@ skipping 175 matching lines @@
 assertEquals('{"y":6,"x":5}', JSON.stringify({x:5,y:6}, ['y', 'x']));
 
 // toJSON get string keys.
 var checker = {};
 var array = [checker];
 checker.toJSON = function(key) { return 1 + key; };
 assertEquals('["10"]', JSON.stringify(array));
 
 // The gap is capped at ten characters if specified as string.
 assertEquals('{\n          "a": "b",\n          "c": "d"\n}',
-              JSON.stringify({a:"b",c:"d"}, null, 
+              JSON.stringify({a:"b",c:"d"}, null,
                              "          /*characters after 10th*/"));
 
 //The gap is capped at ten characters if specified as number.
 assertEquals('{\n          "a": "b",\n          "c": "d"\n}',
               JSON.stringify({a:"b",c:"d"}, null, 15));
 
 // Replaced wrapped primitives are unwrapped.
 function newx(k, v)  { return (k == "x") ? new v(42) : v; }
 assertEquals('{"x":"42"}', JSON.stringify({x: String}, newx));
 assertEquals('{"x":42}', JSON.stringify({x: Number}, newx));
 assertEquals('{"x":true}', JSON.stringify({x: Boolean}, newx));
 
 assertEquals(undefined, JSON.stringify(undefined));
 assertEquals(undefined, JSON.stringify(function () { }));
-// Arrays with missing, undefined or function elements have those elements 
+// Arrays with missing, undefined or function elements have those elements
 // replaced by null.
-assertEquals("[null,null,null]", 
+assertEquals("[null,null,null]",
              JSON.stringify([undefined,,function(){}]));
 
 // Objects with undefined or function properties (including replaced properties)
 // have those properties ignored.
-assertEquals('{}', 
+assertEquals('{}',
              JSON.stringify({a: undefined, b: function(){}, c: 42, d: 42},
-                            function(k, v) { if (k == "c") return undefined; 
+                            function(k, v) { if (k == "c") return undefined;
                                              if (k == "d") return function(){};
                                              return v; }));
 
 TestInvalid('1); throw "foo"; (1');
 
 var x = 0;
 eval("(1); x++; (1)");
 TestInvalid('1); x++; (1');
 
 // Test string conversion of argument.
 var o = { toString: function() { return "42"; } };
 assertEquals(42, JSON.parse(o));
 
 
 for (var i = 0; i < 65536; i++) {
   var string = String.fromCharCode(i);
   var encoded = JSON.stringify(string);
   var expected = "uninitialized";
   // Following the ES5 specification of the abstraction function Quote.
   if (string == '"' || string == '\\') {
     // Step 2.a
     expected = '\\' + string;
   } else if ("\b\t\n\r\f".indexOf(string) >= 0) {
-    // Step 2.b 
+    // Step 2.b
     if (string == '\b') expected = '\\b';
     else if (string == '\t') expected = '\\t';
     else if (string == '\n') expected = '\\n';
     else if (string == '\f') expected = '\\f';
     else if (string == '\r') expected = '\\r';
   } else if (i < 32) {
     // Step 2.c
     if (i < 16) {
       expected = "\\u000" + i.toString(16);
     } else {
       expected = "\\u00" + i.toString(16);
     }
   } else {
     expected = string;
-  }  
+  }
   assertEquals('"' + expected + '"', encoded, "Codepoint " + i);
-} 
+}
+
+
+// Ensure that wrappers and callables are handled correctly.
+var num37 = new Number(42);
+num37.valueOf = function() { return 37; };
+
+var numFoo = new Number(42);
+numFoo.valueOf = "not callable";
+numFoo.toString = function() { return "foo"; };
+
+var numTrue = new Number(42);
+numTrue.valueOf = function() { return true; }
+
+var strFoo = new String("bar");
+strFoo.toString = function() { return "foo"; };
+
+var str37 = new String("bar");
+str37.toString = "not callable";
+str37.valueOf = function() { return 37; };
+
+var strTrue = new String("bar");
+strTrue.toString = function() { return true; }
+
+var func = function() { /* Is callable */ };
+
+var funcJSON = function() { /* Is callable */ };
+funcJSON.toJSON = function() { return "has toJSON"; };
+
+var re = /Is callable/;
+
+var reJSON = /Is callable/;
+reJSON.toJSON = function() { return "has toJSON"; };
+
+assertEquals(
+    '[37,null,1,"foo","37","true",null,"has toJSON",null,"has toJSON"]',
+    JSON.stringify([num37, numFoo, numTrue,
+                    strFoo, str37, strTrue,
+                    func, funcJSON, re, reJSON]));
+
+
+var oddball = Object(42);
+oddball.__proto__ = { __proto__: null, toString: function() { return true; } };
+assertEquals('1', JSON.stringify(oddball));
+
+var getCount = 0;
+var callCount = 0;
+var counter = { get toJSON() { getCount++;
+                               return function() { callCount++;
+                                                   return 42; }; } };
+assertEquals('42', JSON.stringify(counter));
+assertEquals(1, getCount);
+assertEquals(1, callCount);
+
+var oddball2 = Object(42);
+var oddball3 = Object("foo");
+oddball3.__proto__ = { __proto__: null,
+                       toString: "not callable",
+                       valueOf: function() { return true; } };
+oddball2.__proto__ = { __proto__: null,
+                       toJSON: function () { return oddball3; } }
+assertEquals('"true"', JSON.stringify(oddball2));
+
+
+var falseNum = Object("37");
+falseNum.__proto__ = Number.prototype;
+falseNum.toString = function() { return 42; };
+assertEquals('"42"', JSON.stringify(falseNum));