2d.text.measure.text-clusters-split.tentative.html (2008B)
1 <!DOCTYPE html> 2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> 3 <meta charset="UTF-8"> 4 <title>Canvas test: 2d.text.measure.text-clusters-split.tentative</title> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/html/canvas/resources/canvas-tests.js"></script> 8 <link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css"> 9 <body class="show_output"> 10 11 <h1>2d.text.measure.text-clusters-split.tentative</h1> 12 <p class="desc">Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together.</p> 13 14 15 <p class="output">Actual output:</p> 16 <canvas id="c" class="output" width="400" height="200"><p class="fallback">FAIL (fallback content)</p></canvas> 17 18 <ul id="d"></ul> 19 <script> 20 var t = async_test("Test that getTextClusters() splits the input correctly into the minimal clusters, keeping emojis together."); 21 _addTest(function(canvas, ctx) { 22 23 function getClusterIndexes(text) { 24 const clusters = ctx.measureText(text).getTextClusters(); 25 const result = []; 26 for (let i = 0; i < clusters.length; i++) { 27 const end = clusters[i].end; 28 if (end === (i + 1 < clusters.length ? clusters[i + 1].start : text.length)) { 29 result.push(clusters[i].start); 30 } else { 31 result.push([clusters[i].start, clusters[i].end]); 32 } 33 } 34 return result; 35 } 36 37 function assertClusterIndexes(text, expected) { 38 const actual = getClusterIndexes(text); 39 assert_array_equals(actual, expected); 40 } 41 42 ctx.font = '50px serif'; 43 const text = 'ABC ☺️❤️'; 44 ctx.fillText(text, 20, 100); 45 assertClusterIndexes(text, [0, 1, 2, 3, 4, 6]); 46 47 // [UAX#29]: https://unicode.org/reports/tr29/ 48 // [UAX#29] GB9: × (Extend | ZWJ) 49 assertClusterIndexes('X\u200DY', [0, 2]); 50 // [UAX#29] GB11: \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic} 51 assertClusterIndexes('\u{1FFFD}\u200D\u{1FFFD}', [0]); 52 53 }); 54 </script>