The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,61 @@
     1.4 +/*
     1.5 + * Any copyright is dedicated to the Public Domain.
     1.6 + * http://creativecommons.org/licenses/publicdomain/
     1.7 + */
     1.8 +
     1.9 +//-----------------------------------------------------------------------------
    1.10 +var BUGNUMBER = 668024;
    1.11 +var summary =
    1.12 +  'Array.prototype.splice, when it deletes elements, should make sure any ' +
    1.13 +  'deleted but not visited elements are suppressed from subsequent enumeration';
    1.14 +
    1.15 +print(BUGNUMBER + ": " + summary);
    1.16 +
    1.17 +/**************
    1.18 + * BEGIN TEST *
    1.19 + **************/
    1.20 +
    1.21 +var arr = [0, 1, 2, 3, 4, 5, , 7];
    1.22 +
    1.23 +var seen = [];
    1.24 +var sawOneBeforeThree = true;
    1.25 +for (var p in arr)
    1.26 +{
    1.27 +  if (p === "1")
    1.28 +  {
    1.29 +    // The order of enumeration of properties is unspecified, so technically,
    1.30 +    // it would be kosher to enumerate "1" last, say, such that all properties
    1.31 +    // in the array actually were enumerated, including an index which splice
    1.32 +    // would delete.  Don't flag that case as a failure.  (SpiderMonkey doesn't
    1.33 +    // do this, and neither do any of the other browser engines, but it is
    1.34 +    // permissible behavior.)
    1.35 +    if (seen.indexOf("3") >= 0)
    1.36 +    {
    1.37 +      sawOneBeforeThree = false;
    1.38 +      break;
    1.39 +    }
    1.40 +
    1.41 +    arr.splice(2, 3);
    1.42 +  }
    1.43 +
    1.44 +  seen.push(p);
    1.45 +}
    1.46 +
    1.47 +if (sawOneBeforeThree)
    1.48 +{
    1.49 +  // ES5 12.6.4 states:
    1.50 +  //
    1.51 +  //   If a property that has not yet been visited during enumeration is
    1.52 +  //   deleted, then it will not be visited.
    1.53 +  //
    1.54 +  // So if we haven't seen "3" by the time we see "1", the splice call above
    1.55 +  // will delete "3", and therefore we must not see it.
    1.56 +  assertEq(seen.indexOf("3"), -1);
    1.57 +}
    1.58 +
    1.59 +/******************************************************************************/
    1.60 +
    1.61 +if (typeof reportCompare === "function")
    1.62 +  reportCompare(true, true);
    1.63 +
    1.64 +print("Tests complete");