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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.text.measure.text-clusters-split.tentative</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">
<h1>2d.text.measure.text-clusters-split.tentative</h1>
<p class="desc">Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="400" height="200"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
var t = async_test("Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.");
_addTest(function(canvas, ctx) {
function getClusterIndexes(text) {
const clusters = ctx.measureText(text).getTextClusters();
const result = [];
for (let i = 0; i < clusters.length; i++) {
const end = clusters[i].end;
if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) {
result.push(clusters[i].start);
} else {
result.push([clusters[i].start, clusters[i].end]);
}
}
return result;
}
function assertClusterIndexes(text, expected) {
const actual = getClusterIndexes(text);
assert_array_equals(actual, expected);
}
ctx.font = '50px serif';
const text = 'ABC ☺️❤️';
ctx.fillText(text, 20, 100);
assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]);
// [UAX#29]: https://unicode.org/reports/tr29/
// [UAX#29] GB9: × (Extend | ZWJ)
assertClusterIndexes('X\u200DY', [0, 2]);
// [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}
assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]);
});
</script>
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