1 files changed, 82 insertions, 0 deletions
diff --git a/layout/style/FontFaceSetIterator.cpp b/layout/style/FontFaceSetIterator.cpp
new file mode 100644
index 0000000000..ca05ee87d7
--- /dev/null
+++ b/layout/style/FontFaceSetIterator.cpp
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "mozilla/dom/FontFaceSetIterator.h"
+
+#include "js/Array.h"  // JS::NewArrayObject
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION(FontFaceSetIterator, mFontFaceSet)
+
+FontFaceSetIterator::FontFaceSetIterator(FontFaceSet* aFontFaceSet,
+                                         bool aIsKeyAndValue)
+    : mFontFaceSet(aFontFaceSet),
+      mNextIndex(0),
+      mIsKeyAndValue(aIsKeyAndValue) {
+  MOZ_COUNT_CTOR(FontFaceSetIterator);
+}
+
+FontFaceSetIterator::~FontFaceSetIterator() {
+  MOZ_COUNT_DTOR(FontFaceSetIterator);
+}
+
+bool FontFaceSetIterator::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto,
+                                     JS::MutableHandle<JSObject*> aReflector) {
+  return FontFaceSetIterator_Binding::Wrap(aCx, this, aGivenProto, aReflector);
+}
+
+void FontFaceSetIterator::Next(JSContext* aCx,
+                               FontFaceSetIteratorResult& aResult,
+                               ErrorResult& aRv) {
+  if (!mFontFaceSet) {
+    aResult.mDone = true;
+    return;
+  }
+
+  // Skip over non-Author origin fonts (GetFontFaceAt returns nullptr
+  // for those).
+  FontFace* face;
+  while (!(face = mFontFaceSet->GetFontFaceAt(mNextIndex++))) {
+    if (mNextIndex >= mFontFaceSet->SizeIncludingNonAuthorOrigins()) {
+      break;  // this iterator is done
+    }
+  }
+
+  if (!face) {
+    aResult.mValue.setUndefined();
+    aResult.mDone = true;
+    mFontFaceSet = nullptr;
+    return;
+  }
+
+  JS::Rooted<JS::Value> value(aCx);
+  if (!ToJSValue(aCx, face, &value)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  if (mIsKeyAndValue) {
+    JS::RootedValueArray<2> values(aCx);
+    values[0].set(value);
+    values[1].set(value);
+
+    JS::Rooted<JSObject*> array(aCx);
+    array = JS::NewArrayObject(aCx, values);
+    if (array) {
+      aResult.mValue.setObject(*array);
+    }
+  } else {
+    aResult.mValue = value;
+  }
+
+  aResult.mDone = false;
+}
+
+}  // namespace dom
+}  // namespace mozilla