Convert first letter into a pseudo element.

Source/core/dom/RenderTreeBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google 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
@@ skipping 11 matching lines @@
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/dom/RenderTreeBuilder.h"
 
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
 #include "core/css/resolver/StyleResolver.h"
+#include "core/dom/FirstLetterPseudoElement.h"
 #include "core/dom/Fullscreen.h"
 #include "core/dom/Node.h"
+#include "core/dom/PseudoElement.h"
 #include "core/dom/Text.h"
 #include "core/rendering/RenderFullScreen.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/RenderView.h"
 #include "core/svg/SVGElement.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
+RenderTreeBuilder::RenderTreeBuilder(Node* node, RenderStyle* style)
+    : m_node(node)
+    , m_renderingParent(nullptr)
+    , m_style(style)
+{
+    ASSERT(!node->renderer());
+    ASSERT(node->needsAttach());
+    ASSERT(node->document().inStyleRecalc());
+
+    // FIXME: We should be able to ASSERT(node->inActiveDocument()) but childrenChanged is called
+    // before ChildNodeInsertionNotifier in ContainerNode's methods and some implementations
+    // will trigger a layout inside childrenChanged.
+    // Mainly HTMLTextAreaElement::childrenChanged calls HTMLTextFormControlElement::setSelectionRange
+    // which does an updateLayoutIgnorePendingStylesheets.
+
+    Element* element = node->isElementNode() ? toElement(node) : 0;
+    if (element && element->isFirstLetterPseudoElement()) {
+        if (RenderObject* nextRenderer = FirstLetterPseudoElement::firstLetterTextRenderer(*element))
+            m_renderingParent = nextRenderer->parent();
+    } else if (ContainerNode* containerNode = NodeRenderingTraversal::parent(node, &m_parentDetails)) {
+        m_renderingParent = containerNode->renderer();
+    }
+}
+
 RenderObject* RenderTreeBuilder::nextRenderer() const
 {
     ASSERT(m_renderingParent);
 
     Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
 
     if (element && element->isInTopLayer())
         return NodeRenderingTraversal::nextInTopLayer(element);
 
+    if (element && element->isFirstLetterPseudoElement())
+        return FirstLetterPseudoElement::firstLetterTextRenderer(*element);
+
     // Avoid an O(N^2) walk over the children when reattaching all children of a node.
-    if (m_renderingParent->needsAttach())
+    if (m_renderingParent->node() && m_renderingParent->node()->needsAttach())
         return 0;
 
     return NodeRenderingTraversal::nextSiblingRenderer(m_node);
 }
 
 RenderObject* RenderTreeBuilder::parentRenderer() const
 {
     ASSERT(m_renderingParent);
 
     Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
 
-    if (element && m_renderingParent->renderer()) {
-        // FIXME: Guarding this by m_renderingParent->renderer() isn't quite right as the spec for
+    if (element && m_renderingParent) {
+        // FIXME: Guarding this by m_renderingParent isn't quite right as the spec for
         // top layer only talks about display: none ancestors so putting a <dialog> inside an
         // <optgroup> seems like it should still work even though this check will prevent it.
         if (element->isInTopLayer())
             return m_node->document().renderView();
     }
 
-    return m_renderingParent->renderer();
+    return m_renderingParent;
 }
 
 bool RenderTreeBuilder::shouldCreateRenderer() const
 {
     if (!m_renderingParent)
         return false;
     if (m_node->isSVGElement()) {
         // SVG elements only render when inside <svg>, or if the element is an <svg> itself.
-        if (!isSVGSVGElement(*m_node) && !m_renderingParent->isSVGElement())
+        if (!isSVGSVGElement(*m_node) && (!m_renderingParent->node() || !m_renderingParent->node()->isSVGElement()))
             return false;
         if (!toSVGElement(m_node)->isValid())
             return false;
     }
+
     RenderObject* parentRenderer = this->parentRenderer();
     if (!parentRenderer)
         return false;
     if (!parentRenderer->canHaveChildren())
         return false;
     return true;
 }
 
 RenderStyle& RenderTreeBuilder::style() const
 {
@@ skipping 70 matching lines @@
     newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
 
     RenderObject* nextRenderer = this->nextRenderer();
     textNode->setRenderer(newRenderer);
     // Parent takes care of the animations, no need to call setAnimatableStyle.
     newRenderer->setStyle(m_style.release());
     parentRenderer->addChild(newRenderer, nextRenderer);
 }
 
 }