Implement a part of ProcessingInstruction by using PrivateScript

Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 51 matching lines @@
     , m_usesSiblingRulesOverride(false)
     , m_usesFirstLineRules(false)
     , m_usesFirstLetterRules(false)
     , m_usesRemUnits(false)
     , m_maxDirectAdjacentSelectors(0)
     , m_ignorePendingStylesheets(false)
     , m_didCalculateResolver(false)
     // We don't need to create CSSFontSelector for imported document or
     // HTMLTemplateElement's document, because those documents have no frame.
     , m_fontSelector(document.frame() ? CSSFontSelector::create(&document) : nullptr)
-    , m_xslStyleSheet(nullptr)
 {
     if (m_fontSelector)
         m_fontSelector->registerForInvalidationCallbacks(this);
 }
 
 StyleEngine::~StyleEngine()
 {
 }
 
 #if !ENABLE(OILPAN)
@@ skipping 222 matching lines @@
     ASSERT(!isXSLStyleSheet(*node));
 
     TreeScopeStyleSheetCollection* collection = styleSheetCollectionFor(treeScope);
     ASSERT(collection);
     collection->removeStyleSheetCandidateNode(node, scopingNode);
 
     markTreeScopeDirty(treeScope);
     m_activeTreeScopes.remove(&treeScope);
 }
 
-void StyleEngine::addXSLStyleSheet(ProcessingInstruction* node, bool createdByParser)
-{
-    if (!node->inDocument())
-        return;
-
-    ASSERT(isXSLStyleSheet(*node));
-    bool needToUpdate = false;
-    if (createdByParser || !m_xslStyleSheet) {
-        needToUpdate = !m_xslStyleSheet;
-    } else {
-        unsigned position = m_xslStyleSheet->compareDocumentPosition(node, Node::TreatShadowTreesAsDisconnected);
-        needToUpdate = position & Node::DOCUMENT_POSITION_FOLLOWING;
-    }
-
-    if (!needToUpdate)
-        return;
-
-    markTreeScopeDirty(*m_document);
-    m_xslStyleSheet = node;
-}
-
-void StyleEngine::removeXSLStyleSheet(ProcessingInstruction* node)
-{
-    ASSERT(isXSLStyleSheet(*node));
-    if (m_xslStyleSheet != node)
-        return;
-
-    markTreeScopeDirty(*m_document);
-    m_xslStyleSheet = nullptr;
-}
-
 void StyleEngine::modifiedStyleSheetCandidateNode(Node* node)
 {
     if (!node->inDocument())
         return;
 
     TreeScope& treeScope = isHTMLStyleElement(*node) ? node->treeScope() : *m_document;
     ASSERT(isHTMLStyleElement(node) || treeScope == m_document);
     markTreeScopeDirty(treeScope);
 }
 
@@ skipping 161 matching lines @@
 void StyleEngine::didDetach()
 {
     clearResolver();
 }
 
 bool StyleEngine::shouldClearResolver() const
 {
     return !m_didCalculateResolver && !haveStylesheetsLoaded();
 }
 
-bool StyleEngine::shouldApplyXSLTransform() const
-{
-    if (!RuntimeEnabledFeatures::xsltEnabled())
-        return false;
-    return m_xslStyleSheet && !m_document->transformSourceDocument();
-}
-
 void StyleEngine::resolverChanged(StyleResolverUpdateMode mode)
 {
     if (!isMaster()) {
         if (Document* master = this->master())
             master->styleResolverChanged(mode);
         return;
     }
 
     // Don't bother updating, since we haven't loaded all our style info yet
     // and haven't calculated the style selector for the first time.
     if (!document().isActive() || shouldClearResolver()) {
         clearResolver();
         return;
     }
 
-    if (shouldApplyXSLTransform()) {
-        // Processing instruction (XML documents only).
-        // We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
-        // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
-        if (!m_document->parsing() && !m_xslStyleSheet->isLoading())
-            m_document->applyXSLTransform(m_xslStyleSheet.get());
-        return;
-    }
-
     m_didCalculateResolver = true;
     updateActiveStyleSheets(mode);
 }
 
 void StyleEngine::clearFontCache()
 {
     if (m_fontSelector)
         m_fontSelector->fontFaceCache()->clearCSSConnected();
     if (m_resolver)
         m_resolver->invalidateMatchedPropertiesCache();
@@ skipping 131 matching lines @@
     visitor->trace(m_document);
     visitor->trace(m_injectedAuthorStyleSheets);
     visitor->trace(m_authorStyleSheets);
     visitor->trace(m_documentStyleSheetCollection);
     visitor->trace(m_styleSheetCollectionMap);
     visitor->trace(m_scopedStyleResolvers);
     visitor->trace(m_resolver);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
-    visitor->trace(m_xslStyleSheet);
 #endif
     CSSFontSelectorClient::trace(visitor);
 }
 
 }