Index: Source/core/css/analyzer/RuleSetAnalyzer.cpp |
diff --git a/Source/core/css/analyzer/RuleSetAnalyzer.cpp b/Source/core/css/analyzer/RuleSetAnalyzer.cpp |
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+/* |
+ * Copyright (C) 2014 Google Inc. All rights reserved. |
+ * |
+ * Redistribution and use in source and binary forms, with or without |
+ * modification, are permitted provided that the following conditions are |
+ * met: |
+ * |
+ * * Redistributions of source code must retain the above copyright |
+ * notice, this list of conditions and the following disclaimer. |
+ * * Redistributions in binary form must reproduce the above |
+ * copyright notice, this list of conditions and the following disclaimer |
+ * in the documentation and/or other materials provided with the |
+ * distribution. |
+ * * Neither the name of Google Inc. nor the names of its |
+ * contributors may be used to endorse or promote products derived from |
+ * this software without specific prior written permission. |
+ * |
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ */ |
+ |
+#include "config.h" |
+#include "core/css/analyzer/RuleSetAnalyzer.h" |
+ |
+#include "core/css/CSSSelector.h" |
+#include "core/css/CSSSelectorList.h" |
+#include "core/css/RuleFeature.h" |
+#include "core/css/RuleSet.h" |
+#include "core/css/analyzer/DescendantInvalidationSet.h" |
+#include "core/dom/Document.h" |
+#include "core/dom/Element.h" |
+#include "core/dom/Node.h" |
+#include "core/dom/shadow/ElementShadow.h" |
+#include "core/dom/shadow/ShadowRoot.h" |
+#include "wtf/Forward.h" |
+#include "wtf/HashSet.h" |
+#include "wtf/text/AtomicString.h" |
+#include "wtf/text/StringHash.h" |
+ |
+ |
+namespace WebCore { |
+ |
+static bool isSkippableComponentForInvalidation(const CSSSelector* selector) |
+{ |
+ if (selector->matchesPseudoElement() || selector->pseudoType() == CSSSelector::PseudoHost) |
+ return false; |
+ return true; |
+} |
+ |
+// This method is somewhat conservative in what it acceptss. |
+static bool supportsClassDescendantInvalidation(const CSSSelector* selector) |
+{ |
+ bool foundDescendantRelation = false; |
+ bool foundAncestorIdent = false; |
+ bool foundIdent = false; |
+ for (const CSSSelector* component = selector; component; component = component->tagHistory()) { |
+ |
+ // FIXME: We should allow pseudo elements, but we need to change how they hook |
+ // into recalcStyle by moving them to recalcOwnStyle instead of recalcChildStyle. |
+ |
+ // FIXME: next up is adding ids and tags. |
+ if (component->m_match == CSSSelector::Class) { |
+ if (!foundDescendantRelation) |
+ foundIdent = true; |
+ else |
+ foundAncestorIdent = true; |
+ } else if (!isSkippableComponentForInvalidation(component)) { |
+ return false; |
+ } |
+ // FIXME: We can probably support ChildTree and DescendantTree. |
+ switch (component->relation()) { |
+ case CSSSelector::Descendant: |
+ case CSSSelector::Child: |
+ foundDescendantRelation = true; |
+ // Fall through! |
+ case CSSSelector::SubSelector: |
+ continue; |
+ default: |
+ return false; |
+ } |
+ } |
+ return foundDescendantRelation && foundAncestorIdent && foundIdent; |
+} |
+ |
+void extractClassIdOrTag(const CSSSelector& selector, HashSet<AtomicString>& classes, AtomicString& id, AtomicString& tagName) |
+{ |
+ if (selector.m_match == CSSSelector::Tag) |
+ tagName = selector.tagQName().localName(); |
+ else if (selector.m_match == CSSSelector::Id) |
+ id = selector.value(); |
+ else if (selector.m_match == CSSSelector::Class) |
+ classes.add(selector.value()); |
+} |
+ |
+RuleSetAnalyzer::RuleSetAnalyzer() |
+{ |
+} |
+ |
+bool RuleSetAnalyzer::updateClassInvalidationSets(const CSSSelector* selector) |
+{ |
+ if (!selector) |
+ return false; |
+ bool supported = supportsClassDescendantInvalidation(selector); |
+ // if (supported) |
+ // printf("desc. analysis supported for selector: %d %s\n", supported, selector->selectorText().ascii().data()); |
+ if (!supported) |
+ return false; |
+ |
+ HashSet<AtomicString> classes; |
+ AtomicString id; |
+ AtomicString tagName; |
+ |
+ const CSSSelector* lastSelector = selector; |
+ for (; lastSelector->relation() == CSSSelector::SubSelector; lastSelector = lastSelector->tagHistory()) { |
+ extractClassIdOrTag(*selector, classes, id, tagName); |
+ } |
+ extractClassIdOrTag(*lastSelector, classes, id, tagName); |
+ |
+ for ( ; selector; selector = selector->tagHistory()) { |
+ if (selector->m_match == CSSSelector::Class) { |
+ DescendantInvalidationSet* invalidationSet = ensureClassInvalidationSet(selector->value()); |
+ if (!id.isEmpty()) |
+ invalidationSet->addId(id); |
+ if (!tagName.isEmpty()) |
+ invalidationSet->addTagName(tagName); |
+ for (HashSet<AtomicString>::const_iterator it = classes.begin(); it != classes.end(); ++it) { |
+ invalidationSet->addClass(*it); |
+ } |
+ } |
+ } |
+ return true; |
+} |
+ |
+PassRefPtr<RuleSetAnalyzer> RuleSetAnalyzer::create() |
+{ |
+ return adoptRef(new RuleSetAnalyzer); |
+} |
+static bool debug = false; |
+ |
+ |
+void RuleSetAnalyzer::collectFeaturesFromRuleData(RuleFeatureSet& features, const RuleData& ruleData) |
+{ |
+ bool foundSiblingSelector = false; |
+ unsigned maxDirectAdjacentSelectors = 0; |
+ bool selectorUsesClassInvalidationSet= updateClassInvalidationSets(ruleData.selector()); |
+ |
+ HashSet<AtomicString> addedClasses; |
+ for (const CSSSelector* selector = ruleData.selector(); selector; selector = selector->tagHistory()) { |
+ features.collectFeaturesFromSelector(selector, &addedClasses); |
+ |
+ if (const CSSSelectorList* selectorList = selector->selectorList()) { |
+ for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) { |
+ // FIXME: Shouldn't this be checking subSelector->isSiblingSelector()? |
+ if (!foundSiblingSelector && selector->isSiblingSelector()) |
+ foundSiblingSelector = true; |
+ if (subSelector->isDirectAdjacentSelector()) |
+ maxDirectAdjacentSelectors++; |
+ features.collectFeaturesFromSelector(subSelector, &addedClasses); |
+ } |
+ } else { |
+ if (!foundSiblingSelector && selector->isSiblingSelector()) |
+ foundSiblingSelector = true; |
+ if (selector->isDirectAdjacentSelector()) |
+ maxDirectAdjacentSelectors++; |
+ } |
+ } |
+ if (!selectorUsesClassInvalidationSet) { |
+ for (HashSet<AtomicString>::const_iterator it = addedClasses.begin(); it != addedClasses.end(); ++it) { |
+ if (debug) { |
+ printf("recalc whole subtree for class=%s selector=%s\n", it->ascii().data(), ruleData.selector()->selectorText().ascii().data()); |
+ } |
+ DescendantInvalidationSet* invalidationSet = ensureClassInvalidationSet(*it); |
+ invalidationSet->setWholeSubtreeInvalid(); |
+ } |
+ } |
+ // } else { |
+ // printf("desc analysis supported: %s\n", ruleData.selector()->selectorText().ascii().data()); |
+ // } |
+ features.setMaxDirectAdjacentSelectors(maxDirectAdjacentSelectors); |
+ if (foundSiblingSelector) |
+ features.siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin())); |
+ if (ruleData.containsUncommonAttributeSelector()) |
+ features.uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.hasDocumentSecurityOrigin())); |
+} |
+ |
+DescendantInvalidationSet* RuleSetAnalyzer::ensureClassInvalidationSet(const AtomicString& className) |
+{ |
+ InvalidationSetMap::AddResult addResult = classInvalidationSets.add(className, 0); |
+ if (addResult.isNewEntry) |
+ addResult.iterator->value = DescendantInvalidationSet::create(); |
+ return addResult.iterator->value.get(); |
+} |
+ |
+void RuleSetAnalyzer::combine(const RuleSetAnalyzer& other) |
+{ |
+ for (InvalidationSetMap::const_iterator it = other.classInvalidationSets.begin(); it != other.classInvalidationSets.end(); ++it) { |
+ ensureClassInvalidationSet(it->key)->combine(*it->value); |
+ } |
+} |
+ |
+RuleSetAnalyzer::InvalidationVec* RuleSetAnalyzer::ensurePendingInvalidationVector(Element* element) |
+{ |
+ PendingInvalidationMap::AddResult addResult = m_pendingInvalidationMap.add(element, 0); |
+ if (addResult.isNewEntry) |
+ addResult.iterator->value = new InvalidationVec; |
+ return addResult.iterator->value; |
+} |
+ |
+ |
+bool RuleSetAnalyzer::scheduleClassInvalidationForElement(const AtomicString& className, Element* element) |
+{ |
+ if (DescendantInvalidationSet* invalidationSet = classInvalidationSets.get(className)) { |
+ ensurePendingInvalidationVector(element)->append(invalidationSet); |
+ element->setNeedsInvalidation(); |
+ if (debug) |
+ printf("element invalidation recorded for class=%s outerHTML=%s\n", className.ascii().data(), element->outerHTML().ascii().data()); |
+ return true; |
+ } |
+ return false; |
+} |
+ |
+bool RuleSetAnalyzer::needsInvalidation(const Element* element) const |
+{ |
+ return m_pendingInvalidationMap.get(const_cast<Element*>(element)); |
+} |
+ |
+void RuleSetAnalyzer::recalcInvalidation(Document* document) |
+{ |
+ if (debug) |
+ printf("RuleSetAnalyzer::recalcInvalidation\n"); |
+ Vector<AtomicString> invalidationClasses; |
+ for (Node* child = document->firstChild(); child; child = child->nextSibling()) { |
+ if (child->isElementNode() && child->childNeedsInvalidation()) { |
+ Element* childElement = toElement(child); |
+ recalcInvalidationInternal(childElement, invalidationClasses, false); |
+ } |
+ } |
+ document->clearChildNeedsInvalidation(); |
+ m_pendingInvalidationMap.clear(); |
+} |
+ |
+bool RuleSetAnalyzer::recalcInvalidationInternalForShadowRoot(ShadowRoot* root, Vector<AtomicString>& invalidationClasses, bool foundInvalidationSet) |
+{ |
+ bool someElementNeedsStyleRecalc = false; |
+ for (Node* child = root->firstChild(); child; child = child->nextSibling()) { |
+ if (child->isElementNode()) { |
+ Element* childElement = toElement(child); |
+ someElementNeedsStyleRecalc = someElementNeedsStyleRecalc || recalcInvalidationInternal(childElement, invalidationClasses, foundInvalidationSet); |
+ } |
+ } |
+ return someElementNeedsStyleRecalc; |
+} |
+ |
+bool RuleSetAnalyzer::recalcInvalidationInternal(Element* element, Vector<AtomicString>& invalidationClasses, bool foundInvalidationSet) |
+{ |
+ int oldSize = invalidationClasses.size(); |
+ if (InvalidationVec* invalidationVec = m_pendingInvalidationMap.get(element)) { |
+ foundInvalidationSet = true; |
+ if (debug) |
+ printf("found an invalidation vec for element with outerHTML=%s\n", element->outerHTML().ascii().data()); |
+ bool recalcWholeSubtree = false; |
+ for (InvalidationVec::const_iterator it = invalidationVec->begin(); it != invalidationVec->end(); ++it) { |
+ if ((*it)->wholeSubtreeInvalid()) { |
+ recalcWholeSubtree = true; |
+ break; |
+ } else { |
+ (*it)->appendClasses(invalidationClasses); |
+ } |
+ } |
+ if (recalcWholeSubtree) { |
+ if (debug) |
+ printf("setNeedsStyleRecalc(SubtreeStyleChange): element outerHTML=%s\n", element->outerHTML().ascii().data()); |
+ element->setNeedsStyleRecalc(SubtreeStyleChange); |
+ |
+ // share code!! |
+ invalidationClasses.remove(oldSize, invalidationClasses.size() - oldSize); |
+ element->clearChildNeedsInvalidation(); |
+ return true; |
+ } |
+ } |
+ |
+ bool thisElementNeedsStyleRecalc = false; |
+ |
+ if (element->hasClass()) { |
+ const SpaceSplitString& classNames = element->classNames(); |
+ if (debug) |
+ printf("element class: %s\n", element->getClassAttribute().ascii().data()); |
+ for (Vector<AtomicString>::const_iterator it = invalidationClasses.begin(); it != invalidationClasses.end(); ++it) { |
+ if (debug) |
+ printf("checking class for invalidation: %s\n", it->ascii().data()); |
+ if (classNames.contains(*it)) { |
+ thisElementNeedsStyleRecalc = true; |
+ break; |
+ } |
+ } |
+ } |
+ if (foundInvalidationSet || element->childNeedsInvalidation()) { |
+ for (Node* child = element->firstChild(); child; child = child->nextSibling()) { |
+ if (child->isElementNode()) { |
+ Element* childElement = toElement(child); |
+ bool childAddedNeedsRecalc = |
+ recalcInvalidationInternal(childElement, invalidationClasses, foundInvalidationSet); |
+ thisElementNeedsStyleRecalc = thisElementNeedsStyleRecalc || (childAddedNeedsRecalc && foundInvalidationSet); |
+ } |
+ } |
+ for (ShadowRoot* root = element->youngestShadowRoot(); root; root = root->olderShadowRoot()) { |
+ thisElementNeedsStyleRecalc = thisElementNeedsStyleRecalc || recalcInvalidationInternalForShadowRoot(root, invalidationClasses, foundInvalidationSet); |
+ } |
+ } |
+ |
+ if (thisElementNeedsStyleRecalc) { |
+ if (debug) |
+ printf("setNeedsStyleRecalc(LocalStyleChange): element outerHTML=%s\n", element->outerHTML().ascii().data()); |
+ element->setNeedsStyleRecalc(LocalStyleChange); |
+ } |
+ |
+ invalidationClasses.remove(oldSize, invalidationClasses.size() - oldSize); |
+ element->clearChildNeedsInvalidation(); |
+ return thisElementNeedsStyleRecalc; |
+} |
+ |
+} // namespace WebCore |