1 files changed, 240 insertions, 0 deletions
diff --git a/dom/svg/SVGMPathElement.cpp b/dom/svg/SVGMPathElement.cpp
new file mode 100644
index 0000000000..ec441b9aeb
--- /dev/null
+++ b/dom/svg/SVGMPathElement.cpp
@@ -0,0 +1,240 @@
+/* -*- 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/SVGMPathElement.h"
+
+#include "nsDebug.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/SVGObserverUtils.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/SVGAnimateMotionElement.h"
+#include "mozilla/dom/SVGGeometryElement.h"
+#include "nsContentUtils.h"
+#include "nsIReferrerInfo.h"
+#include "mozilla/dom/SVGMPathElementBinding.h"
+#include "nsIURI.h"
+
+NS_IMPL_NS_NEW_SVG_ELEMENT(MPath)
+
+namespace mozilla::dom {
+
+JSObject* SVGMPathElement::WrapNode(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  return SVGMPathElement_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+SVGElement::StringInfo SVGMPathElement::sStringInfo[2] = {
+    {nsGkAtoms::href, kNameSpaceID_None, false},
+    {nsGkAtoms::href, kNameSpaceID_XLink, false}};
+
+// Cycle collection magic -- based on SVGUseElement
+NS_IMPL_CYCLE_COLLECTION_CLASS(SVGMPathElement)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SVGMPathElement,
+                                                SVGMPathElementBase)
+  tmp->UnlinkHrefTarget(false);
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGMPathElement,
+                                                  SVGMPathElementBase)
+  tmp->mPathTracker.Traverse(&cb);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+//----------------------------------------------------------------------
+// nsISupports methods
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(SVGMPathElement,
+                                             SVGMPathElementBase,
+                                             nsIMutationObserver)
+
+// Constructor
+SVGMPathElement::SVGMPathElement(
+    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
+    : SVGMPathElementBase(std::move(aNodeInfo)), mPathTracker(this) {}
+
+SVGMPathElement::~SVGMPathElement() { UnlinkHrefTarget(false); }
+
+//----------------------------------------------------------------------
+// nsINode methods
+
+NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGMPathElement)
+
+already_AddRefed<DOMSVGAnimatedString> SVGMPathElement::Href() {
+  return mStringAttributes[HREF].IsExplicitlySet()
+             ? mStringAttributes[HREF].ToDOMAnimatedString(this)
+             : mStringAttributes[XLINK_HREF].ToDOMAnimatedString(this);
+}
+
+//----------------------------------------------------------------------
+// nsIContent methods
+
+nsresult SVGMPathElement::BindToTree(BindContext& aContext, nsINode& aParent) {
+  MOZ_ASSERT(!mPathTracker.get(),
+             "Shouldn't have href-target yet (or it should've been cleared)");
+  nsresult rv = SVGMPathElementBase::BindToTree(aContext, aParent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (IsInComposedDoc()) {
+    const nsAttrValue* hrefAttrValue =
+        HasAttr(kNameSpaceID_None, nsGkAtoms::href)
+            ? mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_None)
+            : mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink);
+    if (hrefAttrValue) {
+      UpdateHrefTarget(nsIContent::FromNode(aParent),
+                       hrefAttrValue->GetStringValue());
+    }
+  }
+
+  return NS_OK;
+}
+
+void SVGMPathElement::UnbindFromTree(bool aNullParent) {
+  UnlinkHrefTarget(true);
+  SVGMPathElementBase::UnbindFromTree(aNullParent);
+}
+
+void SVGMPathElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                                   const nsAttrValue* aValue,
+                                   const nsAttrValue* aOldValue,
+                                   nsIPrincipal* aMaybeScriptedPrincipal,
+                                   bool aNotify) {
+  if (aName == nsGkAtoms::href) {
+    if (aValue) {
+      if ((aNamespaceID == kNameSpaceID_XLink ||
+           aNamespaceID == kNameSpaceID_None) &&
+          IsInComposedDoc()) {
+        // Note: If we fail the IsInComposedDoc call, it's ok -- we'll update
+        // the target on next BindToTree call.
+
+        // Note: "href" takes priority over xlink:href. So if "xlink:href" is
+        // being set here, we only let that update our target if "href" is
+        // *unset*.
+        if (aNamespaceID != kNameSpaceID_XLink ||
+            !mStringAttributes[HREF].IsExplicitlySet()) {
+          UpdateHrefTarget(GetParent(), aValue->GetStringValue());
+        }
+      }
+    } else {
+      // href attr being removed.
+      if (aNamespaceID == kNameSpaceID_None) {
+        UnlinkHrefTarget(true);
+
+        // After unsetting href, we may still have xlink:href, so we should
+        // try to add it back.
+        const nsAttrValue* xlinkHref =
+            mAttrs.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink);
+        if (xlinkHref) {
+          UpdateHrefTarget(GetParent(), xlinkHref->GetStringValue());
+        }
+      } else if (aNamespaceID == kNameSpaceID_XLink &&
+                 !HasAttr(nsGkAtoms::href)) {
+        UnlinkHrefTarget(true);
+      }  // else: we unset some random-namespace href attribute, or unset
+         // xlink:href but still have href attribute, so keep the target linking
+         // to href.
+    }
+  }
+
+  return SVGMPathElementBase::AfterSetAttr(
+      aNamespaceID, aName, aValue, aOldValue, aMaybeScriptedPrincipal, aNotify);
+}
+
+//----------------------------------------------------------------------
+// SVGElement methods
+
+SVGElement::StringAttributesInfo SVGMPathElement::GetStringInfo() {
+  return StringAttributesInfo(mStringAttributes, sStringInfo,
+                              ArrayLength(sStringInfo));
+}
+
+//----------------------------------------------------------------------
+// nsIMutationObserver methods
+
+void SVGMPathElement::AttributeChanged(Element* aElement, int32_t aNameSpaceID,
+                                       nsAtom* aAttribute, int32_t aModType,
+                                       const nsAttrValue* aOldValue) {
+  if (aNameSpaceID == kNameSpaceID_None) {
+    if (aAttribute == nsGkAtoms::d) {
+      NotifyParentOfMpathChange(GetParent());
+    }
+  }
+}
+
+//----------------------------------------------------------------------
+// Public helper methods
+
+SVGGeometryElement* SVGMPathElement::GetReferencedPath() {
+  if (!HasAttr(kNameSpaceID_XLink, nsGkAtoms::href) &&
+      !HasAttr(kNameSpaceID_None, nsGkAtoms::href)) {
+    MOZ_ASSERT(!mPathTracker.get(),
+               "We shouldn't have a href target "
+               "if we don't have an xlink:href or href attribute");
+    return nullptr;
+  }
+
+  return SVGGeometryElement::FromNodeOrNull(mPathTracker.get());
+}
+
+//----------------------------------------------------------------------
+// Protected helper methods
+
+void SVGMPathElement::UpdateHrefTarget(nsIContent* aParent,
+                                       const nsAString& aHrefStr) {
+  nsCOMPtr<nsIURI> baseURI = GetBaseURI();
+  if (nsContentUtils::IsLocalRefURL(aHrefStr)) {
+    baseURI = SVGObserverUtils::GetBaseURLForLocalRef(this, baseURI);
+  }
+  nsCOMPtr<nsIURI> targetURI;
+  nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), aHrefStr,
+                                            OwnerDoc(), baseURI);
+
+  // Stop observing old target (if any)
+  if (mPathTracker.get()) {
+    mPathTracker.get()->RemoveMutationObserver(this);
+  }
+
+  if (aParent) {
+    // Pass in |aParent| instead of |this| -- first argument is only used
+    // for a call to GetComposedDoc(), and |this| might not have a current
+    // document yet (if our caller is BindToTree).
+    nsCOMPtr<nsIReferrerInfo> referrerInfo =
+        OwnerDoc()->ReferrerInfoForInternalCSSAndSVGResources();
+    mPathTracker.ResetToURIFragmentID(aParent, targetURI, referrerInfo);
+  } else {
+    // if we don't have a parent, then there's no animateMotion element
+    // depending on our target, so there's no point tracking it right now.
+    mPathTracker.Unlink();
+  }
+
+  // Start observing new target (if any)
+  if (mPathTracker.get()) {
+    mPathTracker.get()->AddMutationObserver(this);
+  }
+
+  NotifyParentOfMpathChange(aParent);
+}
+
+void SVGMPathElement::UnlinkHrefTarget(bool aNotifyParent) {
+  // Stop observing old target (if any)
+  if (mPathTracker.get()) {
+    mPathTracker.get()->RemoveMutationObserver(this);
+  }
+  mPathTracker.Unlink();
+
+  if (aNotifyParent) {
+    NotifyParentOfMpathChange(GetParent());
+  }
+}
+
+void SVGMPathElement::NotifyParentOfMpathChange(nsIContent* aParent) {
+  if (auto* animateMotionParent =
+          SVGAnimateMotionElement::FromNodeOrNull(aParent)) {
+    animateMotionParent->MpathChanged();
+    AnimationNeedsResample();
+  }
+}
+
+}  // namespace mozilla::dom