DevTools: [SASS] introduce sass module, implement SCSS AST-builder.

third_party/WebKit/LayoutTests/inspector/sass/sass-test.js

+var initialize_SassTest = function() {
+
+InspectorTest.preloadModule("sass");
+
+InspectorTest.dumpAST = function(ast)
+{
+    var lines = [String.sprintf("=== AST === %s", ast.document.url)];
+    for (var i = 0; i < ast.rules.length; ++i) {
+        var rule = ast.rules[i];
+        lines.push(String.sprintf("rule %d: \"%s\"", i, rule.selector));
+        var ruleLines = dumpRule(rule);
+        lines = lines.concat(indent(ruleLines));
+    }
+    lines.push("======");
+    InspectorTest.addResult(lines.join("\n"));
+    return ast;
+
+    function dumpRule(rule)
+    {
+        var lines = [];
+        for (var i = 0; i < rule.properties.length; ++i) {
+            var property = rule.properties[i];
+            lines.push("property " + i);
+            var propertyLines = dumpProperty(property);
+            lines = lines.concat(indent(propertyLines));
+        }
+        return lines;
+    }
+
+    function dumpProperty(property)
+    {
+        var lines = [];
+        lines.push(String.sprintf("name: \"%s\"", property.name.text));
+        lines = lines.concat(indent(dumpTextNode(property.name)));
+        lines.push(String.sprintf("value: \"%s\"", property.value.text));
+        lines = lines.concat(indent(dumpTextNode(property.value)));
+        lines.push(String.sprintf("range: %s", property.range.toString()));
+        lines.push(String.sprintf("disabled: %s", property.disabled));
+        return lines;
+    }
+
+    function dumpTextNode(textNode)
+    {
+        return [String.sprintf("range: %s", textNode.range.toString())];
+    }
+
+    function indent(lines)
+    {
+        return lines.map(line => "    " + line);
+    }
+}
+
+InspectorTest.validateASTRanges = function(ast)
+{
+    var invalidNodes = [];
+    for (var rule of ast.rules) {
+        for (var property of rule.properties) {
+            validate(property.name);
+            validate(property.value);
+        }
+    }
+    if (invalidNodes.length) {
+        InspectorTest.addResult("Bad ranges: " + invalidNodes.length);
+        for (var node of invalidNodes)
+            InspectorTest.addResult(String.sprintf("  - range: %s text: %s", node.range.toString(), node.text));
+    } else {
+        InspectorTest.addResult("Ranges OK.");
+    }
+    return ast;
+
+    function validate(textNode)
+    {
+        if (textNode.range.extract(textNode.document.text) !== textNode.text)
+            invalidNodes.push(textNode);
+    }
+}
+
+InspectorTest.parseSCSS = function(url, text)
+{
+    return self.runtime.instancePromise(WebInspector.TokenizerFactory)
+        .then(onTokenizer);
+
+    function onTokenizer(tokenizer)
+    {
+        return WebInspector.SASSSupport.parseSCSS(url, text, tokenizer);
+    }
+}
+
+}
+