Convert first letter into a pseudo element.

Source/core/rendering/RenderTextFragment.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef RenderTextFragment_h
 #define RenderTextFragment_h
 
 #include "core/rendering/RenderText.h"
 
 namespace blink {
 
+class FirstLetterPseudoElement;
+
 // Used to represent a text substring of an element, e.g., for text runs that are split because of
 // first letter and that must therefore have different styles (and positions in the render tree).
 // We cache offsets so that text transformations can be applied in such a way that we can recover
 // the original unaltered string from our corresponding DOM node.
 class RenderTextFragment final : public RenderText {
 public:
     RenderTextFragment(Node*, StringImpl*, int startOffset, int length);
     RenderTextFragment(Node*, StringImpl*);
     virtual ~RenderTextFragment();
     virtual void trace(Visitor*) override;
+    virtual void destroy() override;
 
     virtual bool isTextFragment() const override { return true; }
 
     virtual bool canBeSelectionLeaf() const override { return node() && node()->hasEditableStyle(); }
 
     unsigned start() const { return m_start; }
     unsigned end() const { return m_end; }
     virtual unsigned textStartOffset() const override { return start(); }
 
-    RenderBoxModelObject* firstLetter() const { return m_firstLetter; }
-    void setFirstLetter(RenderBoxModelObject* firstLetter) { m_firstLetter = firstLetter; }
-    RenderText* firstRenderTextInFirstLetter() const;
+    void setContentString(StringImpl*);
+    StringImpl* contentString() const { return m_contentString.get(); }
+    // The complete text is all of the text in the associated DOM text node.
+    PassRefPtr<StringImpl> completeText() const;
+    // The fragment text is the text which will be used by this RenderTextFragment. For
+    // things like first-letter this may differ from the completeText as we maybe using
+    // only a portion of the text nodes content.
 
-    void setContentString(StringImpl*);
     virtual PassRefPtr<StringImpl> originalText() const override;
 
     virtual void setText(PassRefPtr<StringImpl>, bool force = false) override;
 
     virtual void transformText() override;
 
     virtual const char* renderName() const override final { return "RenderTextFragment"; }
 
-protected:
-    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
+    void setFirstLetterPseudoElement(FirstLetterPseudoElement* element) { m_firstLetterPseudoElement = element; }
+    FirstLetterPseudoElement* firstLetterPseudoElement() const { return m_firstLetterPseudoElement; }
+
+    void setIsRemainingTextRenderer() { m_isRemainingTextRenderer = true; }
+    bool isRemainingTextRenderer() const { return m_isRemainingTextRenderer; }
 
 private:
-    virtual void willBeDestroyed() override;
+    RenderBlock* blockForAccompanyingFirstLetter() const;
+    virtual UChar previousCharacter() const override;
 
-    virtual UChar previousCharacter() const override;
-    RenderBlock* blockForAccompanyingFirstLetter() const;
-    virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
+    Text* associatedTextNode() const;
 
     unsigned m_start;
     unsigned m_end;
+    bool m_isRemainingTextRenderer;
     RefPtr<StringImpl> m_contentString;
-    RawPtrWillBeMember<RenderBoxModelObject> m_firstLetter;
+    RawPtrWillBeMember<FirstLetterPseudoElement> m_firstLetterPseudoElement;
 };
 
 DEFINE_TYPE_CASTS(RenderTextFragment, RenderObject, object, toRenderText(object)->isTextFragment(), toRenderText(object).isTextFragment());
 
 } // namespace blink
 
 #endif // RenderTextFragment_h