<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Attribute mapping</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#the-mathvariant-attribute">
<link rel="help" href="https://w3c.github.io/mathml-core/#the-displaystyle-and-scriptlevel-attributes">
<meta name="assert" content="Verify that mathvariant, scriptlevel, displaystyle are mapped to CSS">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
  #container {
      /* Ahem font does not have a MATH table so the font-size scale factor
         is always 0.71^{computed - inherited math script level} */
      font: 100px/1 Ahem;
  }
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", runTests);
  function fontSize(style) {
      return parseFloat((/(.+)px/).exec(style.getPropertyValue("font-size"))[1]);
  }
  function runTests() {
      var container = document.getElementById("container");
      for (tag in MathMLFragments) {
          container.insertAdjacentHTML("beforeend", `<math><mrow>${MathMLFragments[tag]}</mrow></math>`);
      }
      Array.from(document.getElementsByClassName("element")).forEach(element => {
          var tag = element.tagName;
          var style = window.getComputedStyle(element);

          test(function() {
              assert_equals(style.getPropertyValue("text-transform"),
                            tag === "mi" ? "math-auto" : "none",
                            "no attribute");
              element.parentNode.setAttribute("style", "text-transform: uppercase");
              assert_equals(style.getPropertyValue("text-transform"),
                            tag === "mi" ? "math-auto" : "uppercase",
                            "text-transform on parent");
              element.setAttribute("mathvariant", "normal");
              assert_equals(style.getPropertyValue("text-transform"),
                            tag === "mi" ? "none" : "uppercase", "attribute specified");
              element.setAttribute("mathvariant", "NoRmAl");
              assert_equals(style.getPropertyValue("text-transform"),
                            tag === "mi" ? "none" : "uppercase", "case insensitive");
          }, `mathvariant on the ${tag} element is ${tag === "mi" ? "" : "not"} mapped to CSS text-transform`)

          test(function() {
              // none and mprescripts appear as scripts
              assert_equals(style.getPropertyValue("math-depth"), tag === "none" || tag === "mprescripts" ? "1" : "0", "no attribute");

              var absoluteScriptlevel = 2;
              element.setAttribute("scriptlevel", absoluteScriptlevel);
              assert_equals(style.getPropertyValue("math-depth"), "" + absoluteScriptlevel, "attribute specified <U>");

              var positiveScriptlevelDelta = 1;
              element.setAttribute("scriptlevel", `+${positiveScriptlevelDelta}`);
              assert_equals(style.getPropertyValue("math-depth"), "" + positiveScriptlevelDelta, "attribute specified +<U>");

              var negativeScriptlevelDelta = -3;
              element.setAttribute("scriptlevel", `${negativeScriptlevelDelta}`);
              assert_equals(style.getPropertyValue("math-depth"), "" + negativeScriptlevelDelta, "attribute specified -<U>");

              element.setAttribute("scriptlevel", absoluteScriptlevel);
              element.setAttribute("mathsize", "42px");
              assert_approx_equals(fontSize(style), 42, 1, "mathsize wins over scriptlevel");

          }, `scriptlevel on the ${tag} element is mapped to math-depth(...)`);

          test(function() {
              element.removeAttribute("scriptlevel");
              // none and mprescripts appear as scripts
              let expected = `${tag === "none" || tag === "mprescripts" ? "1" : "0"}`;
              assert_equals(style.getPropertyValue("math-depth"), expected, "no attribute");

              // FIXME: Should we test values " +1" and "+1 " here?
              // See https://github.com/w3c/mathml/issues/122
              ["+-1", "--1", "+z1", "+ 1", "2.0", "-3\"", "200px", "add(2)"].forEach(invalid_value => {
                element.setAttribute("scriptlevel", invalid_value);
                assert_equals(style.getPropertyValue("math-depth"), expected, `invalid scriptlevel value '${invalid_value}'`);
              });
          }, `invalid scriptlevel values on the ${tag} element are not mapped to math-depth(...)`);

          test(function() {
              assert_equals(style.getPropertyValue("math-style"), "compact", "no attribute");
              element.setAttribute("displaystyle", "true");
              assert_equals(style.getPropertyValue("math-style"), "normal", "attribute specified");
              element.setAttribute("displaystyle", "TrUe");
              assert_equals(style.getPropertyValue("math-style"), "normal", "case insensitive");
          }, `displaystyle on the ${tag} element is mapped to CSS math-style`);
      });

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <div id="container">
    <div><math class="element"></math></div>
  </div>
</body>
</html>
