The Tor Browser / file comparison
comparison: js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js
js/src/tests/ecma_5/Array/splice-suppresses-unvisited-indexes.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:52fc94c424f3 |
|---|---|
| 1 /* | |
| 2 * Any copyright is dedicated to the Public Domain. | |
| 3 * http://creativecommons.org/licenses/publicdomain/ | |
| 4 */ | |
| 5 | |
| 6 //----------------------------------------------------------------------------- | |
| 7 var BUGNUMBER = 668024; | |
| 8 var summary = | |
| 9 'Array.prototype.splice, when it deletes elements, should make sure any ' + | |
| 10 'deleted but not visited elements are suppressed from subsequent enumeration'; | |
| 11 | |
| 12 print(BUGNUMBER + ": " + summary); | |
| 13 | |
| 14 /************** | |
| 15 * BEGIN TEST * | |
| 16 **************/ | |
| 17 | |
| 18 var arr = [0, 1, 2, 3, 4, 5, , 7]; | |
| 19 | |
| 20 var seen = []; | |
| 21 var sawOneBeforeThree = true; | |
| 22 for (var p in arr) | |
| 23 { | |
| 24 if (p === "1") | |
| 25 { | |
| 26 // The order of enumeration of properties is unspecified, so technically, | |
| 27 // it would be kosher to enumerate "1" last, say, such that all properties | |
| 28 // in the array actually were enumerated, including an index which splice | |
| 29 // would delete. Don't flag that case as a failure. (SpiderMonkey doesn't | |
| 30 // do this, and neither do any of the other browser engines, but it is | |
| 31 // permissible behavior.) | |
| 32 if (seen.indexOf("3") >= 0) | |
| 33 { | |
| 34 sawOneBeforeThree = false; | |
| 35 break; | |
| 36 } | |
| 37 | |
| 38 arr.splice(2, 3); | |
| 39 } | |
| 40 | |
| 41 seen.push(p); | |
| 42 } | |
| 43 | |
| 44 if (sawOneBeforeThree) | |
| 45 { | |
| 46 // ES5 12.6.4 states: | |
| 47 // | |
| 48 // If a property that has not yet been visited during enumeration is | |
| 49 // deleted, then it will not be visited. | |
| 50 // | |
| 51 // So if we haven't seen "3" by the time we see "1", the splice call above | |
| 52 // will delete "3", and therefore we must not see it. | |
| 53 assertEq(seen.indexOf("3"), -1); | |
| 54 } | |
| 55 | |
| 56 /******************************************************************************/ | |
| 57 | |
| 58 if (typeof reportCompare === "function") | |
| 59 reportCompare(true, true); | |
| 60 | |
| 61 print("Tests complete"); |
