third_party/web_platform_tests/dom/traversal/NodeIterator-removal.html

<!doctype html>
<title>NodeIterator removal tests</title>
<link rel="author" title="Aryeh Gregor" href=ayg@aryeh.name>
<meta name=timeout content=long>
<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=../common.js></script>
<script>
"use strict";

for (var i = 0; i < testNodes.length; i++) {
  var node = eval(testNodes[i]);
  if (!node.parentNode) {
    // Nothing to test
    continue;
  }
  test(function() {
    var iters = [];
    var descs = [];
    var expectedReferenceNodes = [];
    var expectedPointers = [];

    for (var j = 0; j < testNodes.length; j++) {
      var root = eval(testNodes[j]);
      // Add all distinct iterators with this root, calling nextNode()
      // repeatedly until it winds up with the same iterator.
      for (var k = 0; ; k++) {
        var iter = document.createNodeIterator(root);
        for (var l = 0; l < k; l++) {
          iter.nextNode();
        }
        if (k && iter.referenceNode == iters[iters.length - 1].referenceNode
            && iter.pointerBeforeReferenceNode
               == iters[iters.length - 1].pointerBeforeReferenceNode) {
          break;
        } else {
          iters.push(iter);
          descs.push("document.createNodeIterator(" + testNodes[j]
            + ") advanced " + k + " times");
          expectedReferenceNodes.push(iter.referenceNode);
          expectedPointers.push(iter.pointerBeforeReferenceNode);

          var idx = iters.length - 1;

          // "If the node is root or is not an inclusive ancestor of the
          // referenceNode attribute value, terminate these steps."
          //
          // We also have to rule out the case where node is an ancestor of
          // root, which is implicitly handled by the spec since such a node
          // was not part of the iterator collection to start with.
          if (isInclusiveAncestor(node, root)
              || !isInclusiveAncestor(node, iter.referenceNode)) {
            continue;
          }

          // "If the pointerBeforeReferenceNode attribute value is false, set
          // the referenceNode attribute to the first node preceding the node
          // that is being removed, and terminate these steps."
          if (!iter.pointerBeforeReferenceNode) {
            expectedReferenceNodes[idx] = previousNode(node);
            continue;
          }

          // "If there is a node following the last inclusive descendant of the
          // node that is being removed, set the referenceNode attribute to the
          // first such node, and terminate these steps."
          var next = nextNodeDescendants(node);
          if (next) {
            expectedReferenceNodes[idx] = next;
            continue;
          }

          // "Set the referenceNode attribute to the first node preceding the
          // node that is being removed and set the pointerBeforeReferenceNode
          // attribute to false."
          expectedReferenceNodes[idx] = previousNode(node);
          expectedPointers[idx] = false;
        }
      }
    }

    var oldParent = node.parentNode;
    var oldSibling = node.nextSibling;
    oldParent.removeChild(node);

    for (var j = 0; j < iters.length; j++) {
      var iter = iters[j];
      assert_equals(iter.referenceNode, expectedReferenceNodes[j],
                    ".referenceNode of " + descs[j]);
      assert_equals(iter.pointerBeforeReferenceNode, expectedPointers[j],
                    ".pointerBeforeReferenceNode of " + descs[j]);
    }

    oldParent.insertBefore(node, oldSibling);
  }, "Test removing node " + testNodes[i]);
}

testDiv.style.display = "none";
</script>