stringify-replacer-array-hijinks.js

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// Any copyright is dedicated to the Public Domain.

// http://creativecommons.org/licenses/publicdomain/

var gTestfile = 'stringify-replacer-array-hijinks.js';

//-----------------------------------------------------------------------------

var BUGNUMBER = 648471;

var summary =

  "Better/more correct handling for replacer arrays with getter array index " +

  "properties";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

var replacer = [0, 1, 2, 3];

Object.prototype[3] = 3;

Object.defineProperty(replacer, 1, {

  get: function()

    Object.defineProperty(replacer, 4, { value: 4 });

    delete replacer[2];

    delete replacer[3];

    replacer[5] = 5;

    return 1;

});

var s =

  JSON.stringify({0: { 1: { 3: { 4: { 5: { 2: "omitted" } } } } } }, replacer);

// The replacer array's length is as seen on first query, so property names are

// accumulated for indexes i ∈ {0, 1, 2, 3}, but index 1 deletes 2 and 3, so 2

// isn't seen but 3 is seen as Object.prototype[3].

assertEq('{"0":{"1":{"3":{"3":3}},"3":3},"3":3}', s);

var replacer = [0, 1, 2, 3];

Object.defineProperty(replacer, 0, {

  get: function()

    replacer.length = 0;

    return {};

});

// The replacer.length truncation means only properties on the prototype chain

// shine through, but it doesn't affect the original bounds of the iteration

// used to determine property names which will be included in the final string.

assertEq(JSON.stringify({ 0: 0, 1: 1, 2: 2, 3: 3 }, replacer),

         '{"3":3}');

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");