1 files changed, 126 insertions, 0 deletions
diff --git a/dom/svg/DOMSVGAnimatedLengthList.cpp b/dom/svg/DOMSVGAnimatedLengthList.cpp
new file mode 100644
index 0000000000..b64b923745
--- /dev/null
+++ b/dom/svg/DOMSVGAnimatedLengthList.cpp
@@ -0,0 +1,126 @@
+/* -*- 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 "DOMSVGAnimatedLengthList.h"
+
+#include "DOMSVGLengthList.h"
+#include "SVGAnimatedLengthList.h"
+#include "SVGAttrTearoffTable.h"
+#include "mozilla/dom/SVGAnimatedLengthListBinding.h"
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/RefPtr.h"
+
+// See the architecture comment in this file's header.
+
+namespace mozilla::dom {
+
+static inline SVGAttrTearoffTable<SVGAnimatedLengthList,
+                                  DOMSVGAnimatedLengthList>&
+SVGAnimatedLengthListTearoffTable() {
+  static SVGAttrTearoffTable<SVGAnimatedLengthList, DOMSVGAnimatedLengthList>
+      sSVGAnimatedLengthListTearoffTable;
+  return sSVGAnimatedLengthListTearoffTable;
+}
+
+NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGAnimatedLengthList,
+                                               mElement)
+
+JSObject* DOMSVGAnimatedLengthList::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return dom::SVGAnimatedLengthList_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<DOMSVGLengthList> DOMSVGAnimatedLengthList::BaseVal() {
+  if (!mBaseVal) {
+    mBaseVal = new DOMSVGLengthList(this, InternalAList().GetBaseValue());
+  }
+  RefPtr<DOMSVGLengthList> baseVal = mBaseVal;
+  return baseVal.forget();
+}
+
+already_AddRefed<DOMSVGLengthList> DOMSVGAnimatedLengthList::AnimVal() {
+  if (!mAnimVal) {
+    mAnimVal = new DOMSVGLengthList(this, InternalAList().GetAnimValue());
+  }
+  RefPtr<DOMSVGLengthList> animVal = mAnimVal;
+  return animVal.forget();
+}
+
+/* static */
+already_AddRefed<DOMSVGAnimatedLengthList>
+DOMSVGAnimatedLengthList::GetDOMWrapper(SVGAnimatedLengthList* aList,
+                                        dom::SVGElement* aElement,
+                                        uint8_t aAttrEnum, uint8_t aAxis) {
+  RefPtr<DOMSVGAnimatedLengthList> wrapper =
+      SVGAnimatedLengthListTearoffTable().GetTearoff(aList);
+  if (!wrapper) {
+    wrapper = new DOMSVGAnimatedLengthList(aElement, aAttrEnum, aAxis);
+    SVGAnimatedLengthListTearoffTable().AddTearoff(aList, wrapper);
+  }
+  return wrapper.forget();
+}
+
+/* static */
+DOMSVGAnimatedLengthList* DOMSVGAnimatedLengthList::GetDOMWrapperIfExists(
+    SVGAnimatedLengthList* aList) {
+  return SVGAnimatedLengthListTearoffTable().GetTearoff(aList);
+}
+
+DOMSVGAnimatedLengthList::~DOMSVGAnimatedLengthList() {
+  // Script no longer has any references to us, to our base/animVal objects, or
+  // to any of their list items.
+  SVGAnimatedLengthListTearoffTable().RemoveTearoff(&InternalAList());
+}
+
+void DOMSVGAnimatedLengthList::InternalBaseValListWillChangeTo(
+    const SVGLengthList& aNewValue) {
+  // When the number of items in our internal counterpart's baseVal changes,
+  // we MUST keep our baseVal in sync. If we don't, script will either see a
+  // list that is too short and be unable to access indexes that should be
+  // valid, or else, MUCH WORSE, script will see a list that is too long and be
+  // able to access "items" at indexes that are out of bounds (read/write to
+  // bad memory)!!
+
+  RefPtr<DOMSVGAnimatedLengthList> kungFuDeathGrip;
+  if (mBaseVal) {
+    if (aNewValue.Length() < mBaseVal->LengthNoFlush()) {
+      // InternalListLengthWillChange might clear last reference to |this|.
+      // Retain a temporary reference to keep from dying before returning.
+      kungFuDeathGrip = this;
+    }
+    mBaseVal->InternalListLengthWillChange(aNewValue.Length());
+  }
+
+  // If our attribute is not animating, then our animVal mirrors our baseVal
+  // and we must sync its length too. (If our attribute is animating, then the
+  // SMIL engine takes care of calling InternalAnimValListWillChangeTo() if
+  // necessary.)
+
+  if (!IsAnimating()) {
+    InternalAnimValListWillChangeTo(aNewValue);
+  }
+}
+
+void DOMSVGAnimatedLengthList::InternalAnimValListWillChangeTo(
+    const SVGLengthList& aNewValue) {
+  if (mAnimVal) {
+    mAnimVal->InternalListLengthWillChange(aNewValue.Length());
+  }
+}
+
+bool DOMSVGAnimatedLengthList::IsAnimating() const {
+  return InternalAList().IsAnimating();
+}
+
+SVGAnimatedLengthList& DOMSVGAnimatedLengthList::InternalAList() {
+  return *mElement->GetAnimatedLengthList(mAttrEnum);
+}
+
+const SVGAnimatedLengthList& DOMSVGAnimatedLengthList::InternalAList() const {
+  return *mElement->GetAnimatedLengthList(mAttrEnum);
+}
+
+}  // namespace mozilla::dom