tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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mutationobservers.js (2232B)

      1 // Compares a mutation record to a predefined one
      2 // mutationToCheck is a mutation record from the user agent
      3 // expectedRecord is a mutation record minted by the test
      4 //    for expectedRecord, if properties are omitted, they get default ones
      5 function checkRecords(target, mutationToCheck, expectedRecord) {
      6  var mr1;
      7  var mr2;
      8 
      9 
     10  function checkField(property, isArray) {
     11    var field = mr2[property];
     12    if (isArray === undefined) {
     13      isArray = false;
     14    }
     15    if (field instanceof Function) {
     16      field = field();
     17    } else if (field === undefined) {
     18      if (isArray) {
     19        field = new Array();
     20      } else {
     21        field = null;
     22      }
     23    }
     24    if (isArray) {
     25      assert_array_equals(mr1[property], field, property + " didn't match");
     26    } else {
     27      assert_equals(mr1[property], field, property + " didn't match");
     28    }
     29  }
     30 
     31  assert_equals(mutationToCheck.length, expectedRecord.length, "mutation records must match");
     32  for (var item = 0; item < mutationToCheck.length; item++) {
     33    mr1 = mutationToCheck[item];
     34    mr2 = expectedRecord[item];
     35 
     36    if (mr2.target instanceof Function) {
     37      assert_equals(mr1.target, mr2.target(), "target node must match");
     38    } else if (mr2.target !== undefined) {
     39      assert_equals(mr1.target, mr2.target, "target node must match");
     40    } else {
     41      assert_equals(mr1.target, target, "target node must match");
     42    }
     43 
     44    checkField("type");
     45    checkField("addedNodes", true);
     46    checkField("removedNodes", true);
     47    checkField("previousSibling");
     48    checkField("nextSibling");
     49    checkField("attributeName");
     50    checkField("attributeNamespace");
     51    checkField("oldValue");
     52  };
     53 }
     54 
     55 function runMutationTest(node, mutationObserverOptions, mutationRecordSequence, mutationFunction, description, target) {
     56  var test = async_test(description);
     57 
     58 
     59  function moc(mrl, obs) {
     60    test.step(
     61      function () {
     62            if (target === undefined) target = node;
     63            checkRecords(target, mrl, mutationRecordSequence);
     64        test.done();
     65      }
     66     );
     67  }
     68 
     69  test.step(
     70    function () {
     71      (new MutationObserver(moc)).observe(node, mutationObserverOptions);
     72      mutationFunction();
     73    }
     74  );
     75  return mutationRecordSequence.length
     76 }