Improve CSS Style matching spec compliance

LayoutTests/css3/fonts/resources/style-matching-test.js

+function emptyFontFaceDeclarations()
+{
+    var stylesheet = document.styleSheets[0];
+    var rules = stylesheet.cssRules;
+    var rulesLengthSnapshot = stylesheet.cssRules.length;
+    if (!rulesLengthSnapshot)
+        return;
+    for (var i = 0; i < rulesLengthSnapshot; i++) {
+        stylesheet.deleteRule(0);
+    }
+}
+
+function makeFontFaceDeclaration(stretch, style, weight)
+{
+    var fontFaceDeclaration = '@font-face { font-family: "CSSMatchingtest"; ' +
+        "font-stretch: " + stretch + ";" +
+        "font-style: " + style + ";" +
+        "font-weight: " + weight + ";" +
+        'src: url("' +
+        "resources/fonts/CSSMatchingTest_" +
+        stretch + "_" + style + "_" + weight + '.ttf");';
+    return fontFaceDeclaration;
+}
+
+function notifyInspectorFontsReady() {
+    var cssRules = document.styleSheets[0].cssRules;
+    var fontsAvailable = [];
+    for (var i = 0; i < cssRules.length; i++) {
+        urlmatch = /url\(.*fonts\/CSSMatchingTest_(.*).ttf\)/.exec(
+            cssRules[i].cssText);
+        fontsAvailable.push(urlmatch[1]);
+    }
+    evaluateInFrontend('window.onFontsLoaded(' +
+                       JSON.stringify(fontsAvailable) + ");");
+}
+
+function updateAvailableFontFaceDeclarations(available)
+{
+    emptyFontFaceDeclarations();
+    for (stretch of available.stretches)
+        for (style of available.styles)
+            for (weight of available.weights) {
+                document.styleSheets[0].addRule(
+                    makeFontFaceDeclaration(stretch, style, weight));
+            }
+
+    document.fonts.ready.then(window.notifyInspectorFontsReady);
+}
+
+function test()
+{
+    var documentNodeId;
+    var documentNodeSelector;
+    var allTestSelectors = [];
+    var testSelectors = [];
+
+    var stretches = [ 'condensed', 'expanded' ];
+    var styles = [ 'normal', 'italic' ];
+    var weights = [ '100', '900' ];
+
+    var weightsHumanReadable = [ "Thin", "Black" ];
+
+    var fontSetVariations = [];
+    var currentFontSetVariation = {};
+
+    makeFontSetVariations();
+
+    function makeFontSetVariations() {
+        // For each of the three properties we have three choices:
+        // Restrict to the first value, to the second, or
+        // allow both. So we're iterating over those options
+        // for each dimension to generate the set of allowed
+        // options for each property. The fonts in the test
+        // page will later be generated from these possible
+        // choices / restrictions.
+        function choices(property) {
+            return [ property, [ property[0] ], [ property[1] ] ];
+        }
+
+        for (stretchChoice of choices(stretches)) {
+            for (styleChoice of choices(styles)) {
+                for (weightChoice of choices(weights)) {
+                    var available = {};
+                    available.stretches = stretchChoice;
+                    available.styles = styleChoice;
+                    available.weights = weightChoice;
+                    fontSetVariations.push(available);
+                }
+            }
+        }
+    }
+
+    InspectorTest.requestDocumentNodeId(onDocumentNodeId);
+
+    function onDocumentNodeId(nodeId)
+    {
+        documentNodeId = nodeId;
+
+        InspectorTest.evaluateInInspectedPage(
+            'JSON.stringify(' +
+                'Array.prototype.map.call(' +
+                'document.querySelectorAll(".test *"),' +
+                'function(element) { return element.id } ));',
+            startTestingPage);
+    }
+
+    function startTestingPage(result)
+    {
+        allTestSelectors = JSON.parse(result.result.result.value);
+        nextTest();
+    }
+
+    function nextTest() {
+        if (testSelectors.length) {
+            testNextPageElement();
+        } else {
+            currentFontSetVariation = fontSetVariations.shift();
+            if (currentFontSetVariation) {
+                testSelectors = allTestSelectors.slice();
+                updateFontDeclarationsInPageForVariation(
+                    currentFontSetVariation);
+            } else {
+                InspectorTest.completeTest();
+            }
+        }
+    }
+
+    function updateFontDeclarationsInPageForVariation(fontSetVariation)
+    {
+        window.testPageFontsReady = false;
+        InspectorTest.evaluateInInspectedPage(
+            'updateAvailableFontFaceDeclarations(' +
+                JSON.stringify(fontSetVariation) +
+                ');');
+        // nextTest() is called once we receive the onFontsLoaded
+        // notification from the page.
+    }
+
+    // Explicitly make this available on window scope so that testing
+    // can resume through a signal from the page once the fonts.ready
+    // promise resolves.
+    window.onFontsLoaded = function(loadedFonts) {
+        InspectorTest.log("Available fonts updated: " +
+                          JSON.stringify(loadedFonts) + "\n");
+        // fonts.ready event fires too early, used fonts for rendering
+        // have not been updated yet. Remove this wehn crbug.com/516680
+        // is fixed.
+        // https://drafts.csswg.org/css-font-loading/#font-face-set-ready
+        setTimeout(nextTest, 100);
+    }
+
+    function testNextPageElement(result)
+    {
+        var nextSelector = testSelectors.shift()
+        if (nextSelector) {
+            documentNodeSelector = "#" + nextSelector;
+            platformFontsForElementWithSelector(documentNodeSelector);
+        }
+    }
+
+    function platformFontsForElementWithSelector(selector)
+    {
+        InspectorTest.requestNodeId(documentNodeId, selector, onNodeId);
+
+        function onNodeId(nodeId)
+        {
+            InspectorTest.sendCommandOrDie("CSS.getPlatformFontsForNode",
+                                           { nodeId: nodeId },
+                                           onGotComputedFonts);
+        }
+
+        function onGotComputedFonts(response)
+        {
+            logResults(response);
+            nextTest();
+        }
+    }
+
+    function logResults(response)
+    {
+        InspectorTest.log(documentNodeSelector);
+        logPassFailResult(
+            documentNodeSelector,
+            response.fonts[0].familyName);
+    }
+
+    function cssStyleMatchingExpectationForSelector(selector) {
+        var selectorStretchStyleWeight = selector.substr(1).split("_");
+        var selectorStretch = selectorStretchStyleWeight[0].toLowerCase();
+        var selectorStyle = selectorStretchStyleWeight[1].toLowerCase();
+        var selectorWeight = selectorStretchStyleWeight[2];
+
+        var expectedProperties = {};
+        if (currentFontSetVariation.stretches.indexOf(selectorStretch) > 0) {
+            expectedProperties.stretch = selectorStretch;
+        } else {
+            // If the requested property value is not availabe in the
+            // current font set, then it's restricted to only one value,
+            // which is the nearest match, and at index 0.
+            expectedProperties.stretch = currentFontSetVariation.stretches[0];
+        }
+
+        if (currentFontSetVariation.styles.indexOf(selectorStyle) > 0) {
+            expectedProperties.style = selectorStyle;
+        } else {
+            expectedProperties.style = currentFontSetVariation.styles[0];
+        }
+
+        if (currentFontSetVariation.weights.indexOf(selectorWeight) > 0) {
+            expectedProperties.weight = selectorWeight;
+        } else {
+            expectedProperties.weight = currentFontSetVariation.weights[0];
+        }
+
+        return expectedProperties;
+    }
+
+    function logPassFailResult(selector, usedFontName)
+    {
+        var actualStretchStyleWeight =
+            /CSSMatchingTest (\w*) (\w*) (.*)/.exec(usedFontName);
+        var actualStretch, actualStyle, actualWeight;
+        if (actualStretchStyleWeight && actualStretchStyleWeight.length > 3) {
+            actualStretch = actualStretchStyleWeight[1].toLowerCase();
+            actualStyle = actualStretchStyleWeight[2].toLowerCase();
+            // Font names have human readable weight description,
+            // we need to convert.
+            actualWeight = weights [
+                weightsHumanReadable.indexOf(actualStretchStyleWeight[3]) ];
+        } else {
+            actualStretch = usedFontName;
+            actualStyle = "";
+            actualWeight = "";
+        }
+
+        var expectedProperties = cssStyleMatchingExpectationForSelector(
+            selector);
+
+        InspectorTest.log("Expected: " +
+                          expectedProperties.stretch + " " +
+                          expectedProperties.style + " " +
+                          expectedProperties.weight);
+        InspectorTest.log("Actual: " + actualStretch + " " +
+                          actualStyle + " " +
+                          actualWeight);
+
+        if (actualStretch != expectedProperties.stretch ||
+            actualStyle != expectedProperties.style ||
+            actualWeight != expectedProperties.weight) {
+            InspectorTest.log("FAIL\n");
+        } else {
+            InspectorTest.log("PASS\n");
+        }
+    }
+};
+
+window.addEventListener("DOMContentLoaded", function () {
+    runTest();
+}, false);