1 files changed, 132 insertions, 0 deletions
diff --git a/layout/base/nsGenConList.h b/layout/base/nsGenConList.h
new file mode 100644
index 000000000..55bf6bc32
--- /dev/null
+++ b/layout/base/nsGenConList.h
@@ -0,0 +1,132 @@
+/* -*- 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/. */
+
+/* base class for nsCounterList and nsQuoteList */
+
+#ifndef nsGenConList_h___
+#define nsGenConList_h___
+
+#include "mozilla/LinkedList.h"
+#include "nsIFrame.h"
+#include "nsStyleStruct.h"
+#include "nsCSSPseudoElements.h"
+#include "nsTextNode.h"
+
+class nsGenConList;
+
+struct nsGenConNode : public mozilla::LinkedListElement<nsGenConNode> {
+  // The wrapper frame for all of the pseudo-element's content.  This
+  // frame generally has useful style data and has the
+  // NS_FRAME_GENERATED_CONTENT bit set (so we use it to track removal),
+  // but does not necessarily for |nsCounterChangeNode|s.
+  nsIFrame* mPseudoFrame;
+
+  // Index within the list of things specified by the 'content' property,
+  // which is needed to do 'content: open-quote open-quote' correctly,
+  // and needed for similar cases for counters.
+  const int32_t mContentIndex;
+
+  // null for 'content:no-open-quote', 'content:no-close-quote' and for
+  // counter nodes for increments and resets (rather than uses)
+  RefPtr<nsTextNode> mText;
+
+  explicit nsGenConNode(int32_t aContentIndex)
+    : mPseudoFrame(nullptr)
+    , mContentIndex(aContentIndex)
+  {
+  }
+
+  /**
+   * Finish initializing the generated content node once we know the
+   * relevant text frame. This must be called just after
+   * the textframe has been initialized. This need not be called at all
+   * for nodes that don't generate text. This will generally set the
+   * mPseudoFrame, insert the node into aList, and set aTextFrame up
+   * with the correct text.
+   * @param aList the list the node belongs to
+   * @param aPseudoFrame the :before or :after frame
+   * @param aTextFrame the textframe where the node contents will render
+   * @return true iff this marked the list dirty
+   */
+  virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame,
+                             nsIFrame* aTextFrame)
+  {
+    mPseudoFrame = aPseudoFrame;
+    CheckFrameAssertions();
+    return false;
+  }
+
+  virtual ~nsGenConNode() {} // XXX Avoid, perhaps?
+
+protected:
+  void CheckFrameAssertions() {
+    NS_ASSERTION(mContentIndex <
+                   int32_t(mPseudoFrame->StyleContent()->ContentCount()),
+                 "index out of range");
+      // We allow negative values of mContentIndex for 'counter-reset' and
+      // 'counter-increment'.
+
+    NS_ASSERTION(mContentIndex < 0 ||
+                 mPseudoFrame->StyleContext()->GetPseudo() ==
+                   nsCSSPseudoElements::before ||
+                 mPseudoFrame->StyleContext()->GetPseudo() ==
+                   nsCSSPseudoElements::after,
+                 "not :before/:after generated content and not counter change");
+    NS_ASSERTION(mContentIndex < 0 ||
+                 mPseudoFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT,
+                 "not generated content and not counter change");
+  }
+};
+
+class nsGenConList {
+protected:
+  mozilla::LinkedList<nsGenConNode> mList;
+  uint32_t mSize;
+
+public:
+  nsGenConList() : mSize(0) {}
+  ~nsGenConList() { Clear(); }
+  void Clear();
+  static nsGenConNode* Next(nsGenConNode* aNode) {
+    MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
+    return aNode->getNext();
+  }
+  static nsGenConNode* Prev(nsGenConNode* aNode) {
+    MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
+    return aNode->getPrevious();
+  }
+  void Insert(nsGenConNode* aNode);
+
+  // Destroy all nodes with aFrame as parent. Returns true if some nodes
+  // have been destroyed; otherwise false.
+  bool DestroyNodesFor(nsIFrame* aFrame);
+
+  // Return true if |aNode1| is after |aNode2|.
+  static bool NodeAfter(const nsGenConNode* aNode1,
+                        const nsGenConNode* aNode2);
+
+  bool IsFirst(nsGenConNode* aNode) {
+    MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
+    return aNode == mList.getFirst();
+  }
+
+  bool IsLast(nsGenConNode* aNode) {
+    MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
+    return aNode == mList.getLast();
+  }
+
+private:
+  void Destroy(nsGenConNode* aNode)
+  {
+    MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
+    delete aNode;
+    mSize--;
+  }
+
+  // Map from frame to the first nsGenConNode of it in the list.
+  nsDataHashtable<nsPtrHashKey<nsIFrame>, nsGenConNode*> mNodes;
+};
+
+#endif /* nsGenConList_h___ */