[WIP] Implement :dir()

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 3622 matching lines @@
     // Investigate cases where we share styles to optimize styling performance.
     if (isChildOfV1ShadowHost())
         return false;
     if (hasAnimations())
         return false;
     if (Fullscreen::isActiveFullScreenElement(*this))
         return false;
     return true;
 }
 
+TextDirection Element::directionality() const
+{
+    if (isHTMLElement() && toHTMLElement(this)->hasDirectionAuto()) {
+        CachedTextDirection direction = const_cast<Element*>(this)->ensureUniqueElementData().directionality();
+        if (direction == CachedTextDirection::NotAutoOrNotCached) {
+            toHTMLElement(this)->cacheDirectionalityForDirAuto();
+            direction = elementData()->directionality();
+            DCHECK(direction != CachedTextDirection::NotAutoOrNotCached);
+        }
+        if (direction == CachedTextDirection::AutoLTR)
+            return LTR;
+        return RTL;
+    }
+
+    if (equalIgnoringCase(fastGetAttribute(dirAttr), "ltr"))
+        return LTR;
+    if (equalIgnoringCase(fastGetAttribute(dirAttr), "rtl"))
+        return RTL;
+
+    const Element* parent = FlatTreeTraversal::parentElement(*this);
+    if (parent)
+        return parent->directionality();
+    return LTR;
+}
+
 void Element::logAddElementIfIsolatedWorldAndInDocument(const char element[], const QualifiedName& attr1)
 {
     if (!inShadowIncludingDocument())
         return;
     V8DOMActivityLogger* activityLogger = V8DOMActivityLogger::currentActivityLoggerIfIsolatedWorld();
     if (!activityLogger)
         return;
     Vector<String, 2> argv;
     argv.append(element);
     argv.append(fastGetAttribute(attr1));
@@ skipping 46 matching lines @@
 
 DEFINE_TRACE(Element)
 {
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink