tor-browser

The Tor Browser
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result-iterateNext.html (3564B)

      1 <!DOCTYPE html>
      2 <html>
      3 <head>
      4  <title>Invalidation of iterators over XPath results</title>
      5  <link rel="author" title="Simon Wülker" href="mailto:simon.wuelker@arcor.de">
      6  <link rel="help" href="https://www.w3.org/TR/DOM-Level-3-XPath/xpath.html#XPathResult-iterateNext">
      7  <script src="/resources/testharness.js"></script>
      8  <script src="/resources/testharnessreport.js"></script>
      9 </head>
     10 <body>
     11  <ul id="list">
     12      <li id="first-child"></li>
     13      <li id="second-child"></li>
     14  </ul>
     15  <script>
     16    function make_xpath_query(result_type) {
     17      return document.evaluate(
     18        "//li",
     19        document,
     20        null,
     21        result_type,
     22        null
     23      );
     24    }
     25 
     26    function invalidate_iterator(test) {
     27      let new_element = document.createElement("li");
     28      document.getElementById("list").appendChild(new_element);
     29      test.add_cleanup(() => {
     30        new_element.remove();
     31      })
     32    }
     33 
     34    test((t) => {
     35      let iterator = make_xpath_query(XPathResult.ORDERED_NODE_ITERATOR_TYPE);
     36 
     37      assert_equals(iterator.iterateNext(), document.getElementById("first-child"));
     38      assert_equals(iterator.iterateNext(), document.getElementById("second-child"));
     39      assert_equals(iterator.iterateNext(), null);
     40      assert_false(iterator.invalidIteratorState);
     41    }, "Using an ordered iterator without modifying the dom should yield the expected elements in correct order without errors.");
     42 
     43    test((t) => {
     44      let iterator = make_xpath_query(XPathResult.UNORDERED_NODE_ITERATOR_TYPE);
     45 
     46      assert_not_equals(iterator.iterateNext(), null);
     47      assert_not_equals(iterator.iterateNext(), null);
     48      assert_equals(iterator.iterateNext(), null);
     49      assert_false(iterator.invalidIteratorState);
     50    }, "Using an unordered iterator without modifying the dom should yield the correct number of elements without errors.");
     51 
     52    test((t) => {
     53      let non_iterator_query = make_xpath_query(XPathResult.BOOLEAN_TYPE);
     54 
     55      assert_false(non_iterator_query.invalidIteratorState);
     56      invalidate_iterator(t);
     57      assert_false(non_iterator_query.invalidIteratorState);
     58    }, "invalidIteratorState should be false for non-iterable results.");
     59 
     60    test((t) => {
     61      let non_iterator_query = make_xpath_query(XPathResult.BOOLEAN_TYPE);
     62 
     63      assert_throws_js(TypeError, () => non_iterator_query.iterateNext());
     64    }, "Calling iterateNext on a non-iterable XPathResult should throw a TypeError.");
     65 
     66    test((t) => {
     67      let non_iterator_query = make_xpath_query(XPathResult.BOOLEAN_TYPE);
     68      invalidate_iterator(t);
     69      assert_throws_js(TypeError, () => non_iterator_query.iterateNext());
     70    }, "Calling iterateNext on a non-iterable XPathResult after modifying the DOM should throw a TypeError.");
     71 
     72    test((t) => {
     73        let iterator = make_xpath_query(XPathResult.ORDERED_NODE_ITERATOR_TYPE);
     74 
     75        iterator.iterateNext();
     76 
     77        invalidate_iterator(t);
     78 
     79        assert_throws_dom(
     80          "InvalidStateError",
     81          () => iterator.iterateNext(),
     82        );
     83    }, "Calling iterateNext after having modified the DOM should throw an exception.");
     84 
     85    test((t) => {
     86        let iterator = make_xpath_query(XPathResult.ORDERED_NODE_ITERATOR_TYPE);
     87 
     88        iterator.iterateNext();
     89        iterator.iterateNext();
     90 
     91        invalidate_iterator(t);
     92 
     93        assert_throws_dom(
     94          "InvalidStateError",
     95          () => iterator.iterateNext(),
     96        );
     97    }, "Calling iterateNext after having modified the DOM should throw an exception even if the iterator is exhausted.");
     98  </script>
     99 </body>
    100 </html>