wpt/css/css-highlight-api/Highlight-iteration-with-modifications.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<title>Highlight iteration with insertions and deletions inbetween</title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id='testDiv'>abc</div>
<script>
  'use strict';
  let container = document.getElementById('testDiv');
  let range1 = new StaticRange({startContainer: container, startOffset: 0, endContainer: container, endOffset: 1});
  let range2 = new Range();

  // Test insertions using .add
  test(() => {
    let customHighlight = new Highlight();
    let iterator = customHighlight[Symbol.iterator]();
    customHighlight.add(range1);
    let element = iterator.next();
    assert_false(element.done, 'The iteration continues when a new range is added after starting the iteration');
    assert_equals(element.value, range1, 'A range added after starting the iteration is found during the current iteration, following Set semantics');
    element = iterator.next();
    assert_true(element.done, 'The iteration ends after visiting the added range');
    assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
  }, 'Highlight iteration includes ranges added after starting the iteration (Set-like behavior)');

  test(() => {
    let customHighlight = new Highlight(range1);
    let iterator = customHighlight[Symbol.iterator]();
    customHighlight.add(range2);
    let element = iterator.next();
    assert_false(element.done, 'The iteration continues with the first range');
    assert_equals(element.value, range1, 'The first range is returned');
    element = iterator.next();
    assert_false(element.done, 'The iteration continues to the range added after starting the iteration, following Set semantics');
    assert_equals(element.value, range2, 'The range added after starting the iteration is visited');
    element = iterator.next();
    assert_true(element.done, 'The iteration ends after visiting both ranges');
    assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
  }, 'Highlight iteration includes ranges added after starting the iteration when there were already ranges (Set-like behavior)');

  // Test deletions using .delete
  test(() => {
    let customHighlight = new Highlight(range1);
    let iterator = customHighlight[Symbol.iterator]();
    customHighlight.delete(range1);
    let element = iterator.next();
    assert_true(element.done, 'The iteration ends when the only range is deleted before visiting it, following Set semantics');
    assert_equals(element.value, undefined, 'A range deleted before being visited is not returned during iteration');
  }, 'Highlight iteration skips ranges deleted before being visited (Set-like behavior)');

  test(() => {
    let customHighlight = new Highlight(range1, range2);
    let iterator = customHighlight[Symbol.iterator]();
    customHighlight.delete(range2);
    let element = iterator.next();
    assert_false(element.done, 'The iteration continues with the first range');
    assert_equals(element.value, range1, 'The first range is returned');
    element = iterator.next();
    assert_true(element.done, 'The iteration ends after the first range since the second range was deleted before being visited, following Set semantics');
    assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
  }, 'Highlight iteration skips ranges deleted before being visited even when other ranges remain (Set-like behavior)');

  test(() => {
    let customHighlight = new Highlight(range1, range2);
    let iterator = customHighlight[Symbol.iterator]();
    let element = iterator.next();
    assert_false(element.done, 'The iteration doesn\'t end when there are still two ranges to visit');
    assert_equals(element.value, range1, 'The range that was pointed to by the iterator is returned as it should');
    customHighlight.delete(range1);
    element = iterator.next();
    assert_false(element.done, 'The iteration doesn\'t end when the range previously visited is deleted and there is still a range to visit');
    assert_equals(element.value, range2, 'The range that was pointed to by the iterator is returned as it should although the previous range was deleted after calling .next');
    element = iterator.next();
    assert_true(element.done, 'The iteration ends after going through all the ranges although the first range was deleted after the first call to .next');
    assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
  }, 'Highlight iteration is not modified when a range that was already visited is deleted and there are still ranges to visit');

  // Test deletions using .clear
  test(() => {
    let customHighlight = new Highlight(range1);
    let iterator = customHighlight[Symbol.iterator]();
    customHighlight.clear();
    let element = iterator.next();
    assert_true(element.done, 'The iteration ends when all ranges are cleared before visiting them, following Set semantics');
    assert_equals(element.value, undefined, '.clear() removes all ranges before iteration visits them');
  }, 'Highlight iteration skips all ranges when .clear() is called before visiting them (Set-like behavior)');

</script>