Jan-Niklas Jaeschke
3d244e518c
Consider this example for ordinary `Set`:
```js
s = new Set("f")
> Set(1) {'f'}
iter = s[Symbol.iterator]()
> SetIterator {'f'}
s.delete("f")
> true
e = iter.next()
> {value: undefined, done: true}
```
CSS Highlight should behave the same way.
Differential Revision: https://phabricator.services.mozilla.com/D279863
107 lines
6.8 KiB
HTML
107 lines
6.8 KiB
HTML
<!doctype html>
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<title>HighlightRegistry iteration with insertions and deletions inbetween</title>
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<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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'use strict';
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let customHighlight1 = new Highlight();
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let customHighlight2 = new Highlight();
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let highlightName1 = "example1";
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let highlightName2 = "example2";
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// Test insertions using .set
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test(() => {
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let iterator = CSS.highlights[Symbol.iterator]();
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CSS.highlights.set(highlightName1, customHighlight1);
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let element = iterator.next();
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assert_false(element.done, 'The iteration continues when a new Highlight is added after starting the iteration');
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assert_equals(element.value[0], highlightName1, 'The highlight name added after starting the iteration is found during the current iteration, following Map semantics');
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assert_equals(element.value[1], customHighlight1, 'The Highlight added after starting the iteration is found during the current iteration, following Map semantics');
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element = iterator.next();
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assert_true(element.done, 'The iteration ends after visiting the added Highlight');
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assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
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}, 'HighlightRegistry iteration includes Highlights added after starting the iteration (Map-like behavior)');
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CSS.highlights.clear();
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test(() => {
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CSS.highlights.set(highlightName1, customHighlight1);
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let iterator = CSS.highlights[Symbol.iterator]();
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CSS.highlights.set(highlightName2, customHighlight2);
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let element = iterator.next();
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assert_false(element.done, 'The iteration continues with the first Highlight');
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assert_equals(element.value[0], highlightName1, 'The first highlight name is returned');
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assert_equals(element.value[1], customHighlight1, 'The first Highlight is returned');
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element = iterator.next();
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assert_false(element.done, 'The iteration continues to the Highlight added after starting the iteration, following Map semantics');
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assert_equals(element.value[0], highlightName2, 'The highlight name added after starting the iteration is visited');
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assert_equals(element.value[1], customHighlight2, 'The Highlight added after starting the iteration is visited');
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element = iterator.next();
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assert_true(element.done, 'The iteration ends after visiting both Highlights');
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assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
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}, 'HighlightRegistry iteration includes Highlights added after starting the iteration when there were already Highlights (Map-like behavior)');
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CSS.highlights.clear();
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// Test deletions using .delete
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test(() => {
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CSS.highlights.set(highlightName1, customHighlight1);
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let iterator = CSS.highlights[Symbol.iterator]();
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CSS.highlights.delete(highlightName1);
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let element = iterator.next();
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assert_true(element.done, 'The iteration ends when the only Highlight is deleted before visiting it, following Map semantics');
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assert_equals(element.value, undefined, 'A Highlight deleted before being visited is not returned during iteration');
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}, 'HighlightRegistry iteration skips Highlights deleted before being visited (Map-like behavior)');
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CSS.highlights.clear();
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test(() => {
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CSS.highlights.set(highlightName1, customHighlight1);
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CSS.highlights.set(highlightName2, customHighlight2);
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let iterator = CSS.highlights[Symbol.iterator]();
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CSS.highlights.delete(highlightName2);
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let element = iterator.next();
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assert_false(element.done, 'The iteration doesn\'t end although the Highlight following to the one that was pointed to by the iterator was deleted');
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assert_equals(element.value[0], highlightName1, 'The highlight name that was pointed to by the iterator is returned as it should although the next Highlight was deleted immediately after starting the iteration');
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assert_equals(element.value[1], customHighlight1, 'The Highlight that was pointed to by the iterator is returned as it should although the next Highlight was deleted immediately after starting the iteration');
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element = iterator.next();
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assert_true(element.done, 'The iteration ends after the first Highlight since the second Highlight was deleted before being visited, following Map semantics');
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assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
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}, 'HighlightRegistry iteration skips Highlights deleted before being visited even when other Highlights remain (Map-like behavior)');
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CSS.highlights.clear();
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test(() => {
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CSS.highlights.set(highlightName1, customHighlight1);
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CSS.highlights.set(highlightName2, customHighlight2);
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let iterator = CSS.highlights[Symbol.iterator]();
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let element = iterator.next();
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assert_false(element.done, 'The iteration doesn\'t end when there are still two Highlights to visit');
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assert_equals(element.value[0], highlightName1, 'The highlight name that was pointed to by the iterator is returned as it should');
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assert_equals(element.value[1], customHighlight1, 'The Highlight that was pointed to by the iterator is returned as it should');
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CSS.highlights.delete(highlightName1);
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element = iterator.next();
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assert_false(element.done, 'The iteration doesn\'t end when the Highlight previously visited is deleted and there is still a Highlight to visit');
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assert_equals(element.value[0], highlightName2, 'The highlight name that was pointed to by the iterator is returned as it should although the previous Highlight was deleted after calling .next');
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assert_equals(element.value[1], customHighlight2, 'The Highlight that was pointed to by the iterator is returned as it should although the previous Highlight was deleted after calling .next');
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element = iterator.next();
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assert_true(element.done, 'The iteration ends after going through all the highlights although the first Highlight was deleted after the first call to .next');
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assert_equals(element.value, undefined, '.next() returns undefined when the iteration ends');
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}, 'HighlightRegistry iteration is not modified when a Highlight that was already visited is deleted and there are still Highlights to visit');
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CSS.highlights.clear();
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// Test deletions using .clear
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test(() => {
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CSS.highlights.set(highlightName1, customHighlight1);
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let iterator = CSS.highlights[Symbol.iterator]();
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CSS.highlights.clear();
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let element = iterator.next();
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assert_true(element.done, 'The iteration ends when all Highlights are cleared before visiting them, following Map semantics');
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assert_equals(element.value, undefined, '.clear() removes all Highlights before iteration visits them');
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}, 'HighlightRegistry iteration skips all Highlights when .clear() is called before visiting them (Map-like behavior)');
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</script>
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