third_party/WebKit/LayoutTests/fast/text/zero-width-characters-complex-script.html

   1 <head>
   2 <script>
   3
   4 function testChar(a, b, ch)
   5 {
   6     // Strings a and b selected here do not have any 'interaction' between them.
   7     var span = document.getElementById("characters");
   8     span.firstChild.data = a + b;
   9     var abWidth = span.offsetWidth;
  10     span.firstChild.data = a;
  11     var aWidth = span.offsetWidth;
  12     span.firstChild.data = a + String.fromCharCode(ch) + b;
  13     var abWithChWidth = span.offsetWidth;
  14
  15     if (abWithChWidth > abWidth)
  16         return 1;
  17     if (abWidth > aWidth)
  18         return 0;
  19     return 1;
  20 }
  21
  22 function testWithZeroWidthSpace(a, b) {
  23     var failedCount = 0;
  24
  25     for (var i = 1; i < 32; ++i)
  26         if (i != 9 && i != 10 && i != 13)
  27             failedCount += testChar(a, b, i);
  28
  29     for (var i = 0x7F; i < 0xA0; ++i)
  30         failedCount += testChar(a, b, i);
  31     failedCount += testChar(a, b, 0xAD);
  32
  33     // ZWJ (U+200C) and ZWNJ (U+200D) are excluded because they
  34     // can affect the rendering in complex script text.
  35     failedCount += testChar(a, b, 0x200B);
  36     failedCount += testChar(a, b, 0x200E);
  37     failedCount += testChar(a, b, 0x200F);
  38     failedCount += testChar(a, b, 0x202A);
  39     failedCount += testChar(a, b, 0x202B);
  40     failedCount += testChar(a, b, 0x202C);
  41     failedCount += testChar(a, b, 0x202D);
  42     failedCount += testChar(a, b, 0x202E);
  43     failedCount += testChar(a, b, 0xFEFF);
  44     failedCount += testChar(a, b, 0xFFFC);
  45
  46     return failedCount;
  47 }
  48
  49 function test()
  50 {
  51     if (window.testRunner)
  52         testRunner.dumpAsText();
  53
  54     var failedDevanagariCount = testWithZeroWidthSpace("\u0915\u093E", "\u0916");
  55
  56     var failedArabicCount = testWithZeroWidthSpace("\u0627\u0644\u0645\u062A\u0648\u0633\u0637\u0020\u200B\u200B\u0647\u0648\u0020\u0020", "\u0647\u0648\u0020");
  57
  58     var testArea = document.getElementById("testArea");
  59     testArea.parentNode.removeChild(testArea);
  60
  61     var result = "";
  62     if (failedDevanagariCount == 0 && failedArabicCount == 0)
  63         result = "PASS: All characters had zero-width.";
  64     else {
  65         if (failedDevanagariCount > 0)
  66             result = "FAIL: " + failedDevanagariCount + " characters had non-zero width" +
  67                  " or failed to get measured when test with Devanagari";
  68         if (failedArabicCount > 0)
  69             result += "\nFAIL: " + failedArabicCount + " characters had non-zero width" +
  70                  " or failed to get measured when test with Arabic";
  71     }
  72     document.getElementById("result").firstChild.data = result;
  73 }
  74 </script>
  75 </head>
  76 <body onload="test()">
  77 <p>This test checks various characters that should always be zero width to ensure that they are when enclosed by complex script characters.
  78 The WebKit text system ensures this in a way that's independent of the fonts installed on the system.</p>
  79 <p id="result">FAIL: Script did not run to completion.</p>
  80 <p id="testArea"><span id="characters">&#x0915;&#x093E;&#x0916;</span></p>
  81 </body>