Reland JSON.stringify reimplementation.

test/mjsunit/json.js

Index: test/mjsunit/json.js
diff --git a/test/mjsunit/json.js b/test/mjsunit/json.js
index 54fa1854f70f97ec2e593d2829c8a2835d73cd0c..6e91725c7d85f3c2dc18034d5d524060ba10a709 100644
--- a/test/mjsunit/json.js
+++ b/test/mjsunit/json.js
@@ -257,6 +257,42 @@ assertEquals("[1,2,[3,[4],5],6,7]",
 assertEquals("[2,4,[6,[8],10],12,14]",
              JSON.stringify([1, 2, [3, [4], 5], 6, 7], DoubleNumbers));
 assertEquals('["a","ab","abc"]', JSON.stringify(["a","ab","abc"]));
+assertEquals('{"a":1,"c":true}',
+              JSON.stringify({ a : 1,
+                               b : function() { 1 },
+                               c : true,
+                               d : function() { 2 } }));
+assertEquals('[1,null,true,null]',
+             JSON.stringify([1, function() { 1 }, true, function() { 2 }]));
+assertEquals('"toJSON 123"',
+             JSON.stringify({ toJSON : function() { return 'toJSON 123'; } }));
+assertEquals('{"a":321}',
+             JSON.stringify({ a : { toJSON : function() { return 321; } } }));
+var counter = 0;
+assertEquals('{"getter":123}',
+             JSON.stringify({ get getter() { counter++; return 123; } }));
+assertEquals(1, counter);
+assertEquals('{"a":"abc","b":"\u1234bc"}',
+             JSON.stringify({ a : "abc", b : "\u1234bc" }));
+
+
+var a = { a : 1, b : 2 };
+delete a.a;
+assertEquals('{"b":2}', JSON.stringify(a));
+
+var b = {};
+b.__proto__ = { toJSON : function() { return 321;} };
+assertEquals("321", JSON.stringify(b));
+
+var array = [""];
+var expected = '""';
+for (var i = 0; i < 10000; i++) {
+  array.push("");
+  expected = '"",' + expected;
+}
+expected = '[' + expected + ']';
+assertEquals(expected, JSON.stringify(array));
+
 
 var circular = [1, 2, 3];
 circular[2] = circular;