michael@0: // Any copyright is dedicated to the Public Domain.
michael@0: // http://creativecommons.org/licenses/publicdomain/
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: var BUGNUMBER = 578273;
michael@0: var summary =
michael@0:   "ES5: Properly detect cycles in JSON.stringify (throw TypeError, check for " +
michael@0:   "cycles rather than imprecisely rely on recursion limits)";
michael@0: 
michael@0: print(BUGNUMBER + ": " + summary);
michael@0: 
michael@0: /**************
michael@0:  * BEGIN TEST *
michael@0:  **************/
michael@0: 
michael@0: // objects
michael@0: 
michael@0: var count = 0;
michael@0: var desc =
michael@0:   {
michael@0:     get: function() { count++; return obj; },
michael@0:     enumerable: true,
michael@0:     configurable: true
michael@0:   };
michael@0: var obj = Object.defineProperty({ p1: 0 }, "p2", desc);
michael@0: 
michael@0: try
michael@0: {
michael@0:   var str = JSON.stringify(obj);
michael@0:   assertEq(false, true, "should have thrown, got " + str);
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true,
michael@0:            "wrong error type: " + e.constructor.name);
michael@0:   assertEq(count, 1,
michael@0:            "cyclic data structures not detected immediately");
michael@0: }
michael@0: 
michael@0: count = 0;
michael@0: var obj2 = Object.defineProperty({}, "obj", desc);
michael@0: try
michael@0: {
michael@0:   var str = JSON.stringify(obj2);
michael@0:   assertEq(false, true, "should have thrown, got " + str);
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true,
michael@0:            "wrong error type: " + e.constructor.name);
michael@0:   assertEq(count, 2,
michael@0:            "cyclic data structures not detected immediately");
michael@0: }
michael@0: 
michael@0: 
michael@0: // arrays
michael@0: 
michael@0: var count = 0;
michael@0: var desc =
michael@0:   {
michael@0:     get: function() { count++; return arr; },
michael@0:     enumerable: true,
michael@0:     configurable: true
michael@0:   };
michael@0: var arr = Object.defineProperty([], "0", desc);
michael@0: 
michael@0: try
michael@0: {
michael@0:   var str = JSON.stringify(arr);
michael@0:   assertEq(false, true, "should have thrown, got " + str);
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true,
michael@0:            "wrong error type: " + e.constructor.name);
michael@0:   assertEq(count, 1,
michael@0:            "cyclic data structures not detected immediately");
michael@0: }
michael@0: 
michael@0: count = 0;
michael@0: var arr2 = Object.defineProperty([], "0", desc);
michael@0: try
michael@0: {
michael@0:   var str = JSON.stringify(arr2);
michael@0:   assertEq(false, true, "should have thrown, got " + str);
michael@0: }
michael@0: catch (e)
michael@0: {
michael@0:   assertEq(e instanceof TypeError, true,
michael@0:            "wrong error type: " + e.constructor.name);
michael@0:   assertEq(count, 2,
michael@0:            "cyclic data structures not detected immediately");
michael@0: }
michael@0: 
michael@0: /******************************************************************************/
michael@0: 
michael@0: if (typeof reportCompare === "function")
michael@0:   reportCompare(true, true);
michael@0: 
michael@0: print("Tests complete");