1 files changed, 107 insertions, 0 deletions
diff --git a/layout/style/CSS.cpp b/layout/style/CSS.cpp
new file mode 100644
index 000000000..b70f67a50
--- /dev/null
+++ b/layout/style/CSS.cpp
@@ -0,0 +1,107 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* DOM object holding utility CSS functions */
+
+#include "CSS.h"
+
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/ServoBindings.h"
+#include "nsCSSParser.h"
+#include "nsGlobalWindow.h"
+#include "nsIDocument.h"
+#include "nsIURI.h"
+#include "nsStyleUtil.h"
+#include "xpcpublic.h"
+
+namespace mozilla {
+namespace dom {
+
+struct SupportsParsingInfo
+{
+  nsIURI* mDocURI;
+  nsIURI* mBaseURI;
+  nsIPrincipal* mPrincipal;
+  StyleBackendType mStyleBackendType;
+};
+
+static nsresult
+GetParsingInfo(const GlobalObject& aGlobal,
+               SupportsParsingInfo& aInfo)
+{
+  nsGlobalWindow* win = xpc::WindowOrNull(aGlobal.Get());
+  if (!win) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIDocument> doc = win->GetDoc();
+  if (!doc) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aInfo.mDocURI = nsCOMPtr<nsIURI>(doc->GetDocumentURI()).get();
+  aInfo.mBaseURI = nsCOMPtr<nsIURI>(doc->GetBaseURI()).get();
+  aInfo.mPrincipal = win->GetPrincipal();
+  aInfo.mStyleBackendType = doc->GetStyleBackendType();
+  return NS_OK;
+}
+
+/* static */ bool
+CSS::Supports(const GlobalObject& aGlobal,
+              const nsAString& aProperty,
+              const nsAString& aValue,
+              ErrorResult& aRv)
+{
+  SupportsParsingInfo info;
+
+  nsresult rv = GetParsingInfo(aGlobal, info);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return false;
+  }
+
+  if (info.mStyleBackendType == StyleBackendType::Servo) {
+    NS_ConvertUTF16toUTF8 property(aProperty);
+    NS_ConvertUTF16toUTF8 value(aValue);
+    return Servo_CSSSupports(&property, &value);
+  }
+
+  nsCSSParser parser;
+  return parser.EvaluateSupportsDeclaration(aProperty, aValue, info.mDocURI,
+                                            info.mBaseURI, info.mPrincipal);
+}
+
+/* static */ bool
+CSS::Supports(const GlobalObject& aGlobal,
+              const nsAString& aCondition,
+              ErrorResult& aRv)
+{
+  SupportsParsingInfo info;
+
+  nsresult rv = GetParsingInfo(aGlobal, info);
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return false;
+  }
+
+  if (info.mStyleBackendType == StyleBackendType::Servo) {
+    MOZ_CRASH("stylo: CSS.supports() with arguments is not yet implemented");
+  }
+
+  nsCSSParser parser;
+  return parser.EvaluateSupportsCondition(aCondition, info.mDocURI,
+                                          info.mBaseURI, info.mPrincipal);
+}
+
+/* static */ void
+CSS::Escape(const GlobalObject& aGlobal,
+            const nsAString& aIdent,
+            nsAString& aReturn)
+{
+  nsStyleUtil::AppendEscapedCSSIdent(aIdent, aReturn);
+}
+
+} // namespace dom
+} // namespace mozilla