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-rw-r--r--layout/base/nsGenConList.h132
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diff --git a/layout/base/nsGenConList.h b/layout/base/nsGenConList.h
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+/* -*- 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___ */