1 files changed, 255 insertions, 0 deletions
diff --git a/dom/base/nsTextNode.cpp b/dom/base/nsTextNode.cpp
new file mode 100644
index 0000000000..df08c547be
--- /dev/null
+++ b/dom/base/nsTextNode.cpp
@@ -0,0 +1,255 @@
+/* -*- 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/. */
+
+/*
+ * Implementation of DOM Core's Text node.
+ */
+
+#include "nsTextNode.h"
+#include "mozilla/dom/TextBinding.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/DirectionalityUtils.h"
+#include "mozilla/dom/Document.h"
+#include "nsThreadUtils.h"
+#include "nsStubMutationObserver.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#ifdef MOZ_DOM_LIST
+#  include "nsRange.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+/**
+ * class used to implement attr() generated content
+ */
+class nsAttributeTextNode final : public nsTextNode,
+                                  public nsStubMutationObserver {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  nsAttributeTextNode(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
+                      int32_t aNameSpaceID, nsAtom* aAttrName,
+                      nsAtom* aFallback)
+      : nsTextNode(std::move(aNodeInfo)),
+        mGrandparent(nullptr),
+        mNameSpaceID(aNameSpaceID),
+        mAttrName(aAttrName),
+        mFallback(aFallback) {
+    NS_ASSERTION(mNameSpaceID != kNameSpaceID_Unknown, "Must know namespace");
+    NS_ASSERTION(mAttrName, "Must have attr name");
+  }
+
+  virtual nsresult BindToTree(BindContext&, nsINode& aParent) override;
+  virtual void UnbindFromTree(bool aNullParent = true) override;
+
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+  virtual already_AddRefed<CharacterData> CloneDataNode(
+      mozilla::dom::NodeInfo* aNodeInfo, bool aCloneText) const override {
+    RefPtr<nsAttributeTextNode> it =
+        new (aNodeInfo->NodeInfoManager()) nsAttributeTextNode(
+            do_AddRef(aNodeInfo), mNameSpaceID, mAttrName, mFallback);
+    if (aCloneText) {
+      it->mText = mText;
+    }
+
+    return it.forget();
+  }
+
+  // Public method for the event to run
+  void UpdateText() { UpdateText(true); }
+
+ private:
+  virtual ~nsAttributeTextNode() {
+    NS_ASSERTION(!mGrandparent, "We were not unbound!");
+  }
+
+  // Update our text to our parent's current attr value
+  void UpdateText(bool aNotify);
+
+  // This doesn't need to be a strong pointer because it's only non-null
+  // while we're bound to the document tree, and it points to an ancestor
+  // so the ancestor must be bound to the document tree the whole time
+  // and can't be deleted.
+  Element* mGrandparent;
+  // What attribute we're showing
+  int32_t mNameSpaceID;
+  RefPtr<nsAtom> mAttrName;
+  RefPtr<nsAtom> mFallback;
+};
+
+nsTextNode::~nsTextNode() = default;
+
+// Use the CC variant of this, even though this class does not define
+// a new CC participant, to make QIing to the CC interfaces faster.
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(nsTextNode, CharacterData)
+
+JSObject* nsTextNode::WrapNode(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) {
+  return Text_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<CharacterData> nsTextNode::CloneDataNode(
+    mozilla::dom::NodeInfo* aNodeInfo, bool aCloneText) const {
+  RefPtr<nsTextNode> it =
+      new (aNodeInfo->NodeInfoManager()) nsTextNode(do_AddRef(aNodeInfo));
+  if (aCloneText) {
+    it->mText = mText;
+  }
+
+  return it.forget();
+}
+
+nsresult nsTextNode::AppendTextForNormalize(const char16_t* aBuffer,
+                                            uint32_t aLength, bool aNotify,
+                                            nsIContent* aNextSibling) {
+  CharacterDataChangeInfo::Details details = {
+      CharacterDataChangeInfo::Details::eMerge, aNextSibling};
+  return SetTextInternal(mText.GetLength(), 0, aBuffer, aLength, aNotify,
+                         &details);
+}
+
+nsresult nsTextNode::BindToTree(BindContext& aContext, nsINode& aParent) {
+  nsresult rv = CharacterData::BindToTree(aContext, aParent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  SetDirectionFromNewTextNode(this);
+
+  return NS_OK;
+}
+
+void nsTextNode::UnbindFromTree(bool aNullParent) {
+  ResetDirectionSetByTextNode(this);
+
+  CharacterData::UnbindFromTree(aNullParent);
+}
+
+#ifdef MOZ_DOM_LIST
+void nsTextNode::List(FILE* out, int32_t aIndent) const {
+  int32_t index;
+  for (index = aIndent; --index >= 0;) fputs("  ", out);
+
+  fprintf(out, "Text@%p", static_cast<const void*>(this));
+  fprintf(out, " flags=[%08x]", static_cast<unsigned int>(GetFlags()));
+  if (IsClosestCommonInclusiveAncestorForRangeInSelection()) {
+    const LinkedList<AbstractRange>* ranges =
+        GetExistingClosestCommonInclusiveAncestorRanges();
+    uint32_t count = ranges ? ranges->length() : 0;
+    fprintf(out, " ranges:%d", count);
+  }
+  fprintf(out, " primaryframe=%p", static_cast<void*>(GetPrimaryFrame()));
+  fprintf(out, " refcount=%" PRIuPTR "<", mRefCnt.get());
+
+  nsAutoString tmp;
+  ToCString(tmp, 0, mText.GetLength());
+  fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
+
+  fputs(">\n", out);
+}
+
+void nsTextNode::DumpContent(FILE* out, int32_t aIndent, bool aDumpAll) const {
+  if (aDumpAll) {
+    int32_t index;
+    for (index = aIndent; --index >= 0;) fputs("  ", out);
+
+    nsAutoString tmp;
+    ToCString(tmp, 0, mText.GetLength());
+
+    if (!tmp.EqualsLiteral("\\n")) {
+      fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
+      if (aIndent) fputs("\n", out);
+    }
+  }
+}
+#endif
+
+nsresult NS_NewAttributeContent(nsNodeInfoManager* aNodeInfoManager,
+                                int32_t aNameSpaceID, nsAtom* aAttrName,
+                                nsAtom* aFallback, nsIContent** aResult) {
+  MOZ_ASSERT(aNodeInfoManager, "Missing nodeInfoManager");
+  MOZ_ASSERT(aAttrName, "Must have an attr name");
+  MOZ_ASSERT(aNameSpaceID != kNameSpaceID_Unknown, "Must know namespace");
+
+  *aResult = nullptr;
+
+  RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfoManager->GetTextNodeInfo();
+
+  RefPtr<nsAttributeTextNode> textNode = new (aNodeInfoManager)
+      nsAttributeTextNode(ni.forget(), aNameSpaceID, aAttrName, aFallback);
+  textNode.forget(aResult);
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(nsAttributeTextNode, nsTextNode,
+                            nsIMutationObserver)
+
+nsresult nsAttributeTextNode::BindToTree(BindContext& aContext,
+                                         nsINode& aParent) {
+  MOZ_ASSERT(aParent.IsContent() && aParent.GetParent(),
+             "This node can't be a child of the document or of "
+             "the document root");
+
+  nsresult rv = nsTextNode::BindToTree(aContext, aParent);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  NS_ASSERTION(!mGrandparent, "We were already bound!");
+  mGrandparent = aParent.GetParent()->AsElement();
+  mGrandparent->AddMutationObserver(this);
+
+  // Note that there is no need to notify here, since we have no
+  // frame yet at this point.
+  UpdateText(false);
+
+  return NS_OK;
+}
+
+void nsAttributeTextNode::UnbindFromTree(bool aNullParent) {
+  // UnbindFromTree can be called anytime so we have to be safe.
+  if (mGrandparent) {
+    // aNullParent might not be true here, but we want to remove the
+    // mutation observer anyway since we only need it while we're
+    // in the document.
+    mGrandparent->RemoveMutationObserver(this);
+    mGrandparent = nullptr;
+  }
+  nsTextNode::UnbindFromTree(aNullParent);
+}
+
+void nsAttributeTextNode::AttributeChanged(Element* aElement,
+                                           int32_t aNameSpaceID,
+                                           nsAtom* aAttribute, int32_t aModType,
+                                           const nsAttrValue* aOldValue) {
+  if (aNameSpaceID == mNameSpaceID && aAttribute == mAttrName &&
+      aElement == mGrandparent) {
+    // Since UpdateText notifies, do it when it's safe to run script.  Note
+    // that if we get unbound while the event is up that's ok -- we'll just
+    // have no grandparent when it fires, and will do nothing.
+    void (nsAttributeTextNode::*update)() = &nsAttributeTextNode::UpdateText;
+    nsContentUtils::AddScriptRunner(NewRunnableMethod(
+        "nsAttributeTextNode::AttributeChanged", this, update));
+  }
+}
+
+void nsAttributeTextNode::NodeWillBeDestroyed(nsINode* aNode) {
+  NS_ASSERTION(aNode == static_cast<nsINode*>(mGrandparent), "Wrong node!");
+  mGrandparent = nullptr;
+}
+
+void nsAttributeTextNode::UpdateText(bool aNotify) {
+  if (mGrandparent) {
+    nsAutoString attrValue;
+
+    if (!mGrandparent->GetAttr(mNameSpaceID, mAttrName, attrValue)) {
+      // Attr value does not exist, use fallback instead
+      mFallback->ToString(attrValue);
+    }
+
+    SetText(attrValue, aNotify);
+  }
+}