| /* |
| * Copyright (C) 2013 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/dom/CSSSelectorWatch.h" |
| |
| #include "core/css/CSSParser.h" |
| #include "core/css/CSSSelectorList.h" |
| #include "core/css/StylePropertySet.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/ExecutionContext.h" |
| #include "core/loader/FrameLoaderClient.h" |
| #include "core/frame/Frame.h" |
| #include "core/rendering/style/StyleRareNonInheritedData.h" |
| |
| namespace WebCore { |
| |
| // The address of this string is important; its value is just documentation. |
| static const char kSupplementName[] = "CSSSelectorWatch"; |
| |
| CSSSelectorWatch::CSSSelectorWatch(Document& document) |
| : m_document(document) |
| , m_callbackSelectorChangeTimer(this, &CSSSelectorWatch::callbackSelectorChangeTimerFired) |
| , m_timerExpirations(0) |
| { |
| } |
| |
| CSSSelectorWatch& CSSSelectorWatch::from(Document& document) |
| { |
| CSSSelectorWatch* watch = static_cast<CSSSelectorWatch*>(DocumentSupplement::from(&document, kSupplementName)); |
| if (!watch) { |
| watch = new CSSSelectorWatch(document); |
| DocumentSupplement::provideTo(&document, kSupplementName, adoptPtr(watch)); |
| } |
| return *watch; |
| } |
| |
| void CSSSelectorWatch::callbackSelectorChangeTimerFired(Timer<CSSSelectorWatch>*) |
| { |
| // Should be ensured by updateSelectorMatches(): |
| ASSERT(!m_addedSelectors.isEmpty() || !m_removedSelectors.isEmpty()); |
| |
| if (m_timerExpirations < 1) { |
| m_timerExpirations++; |
| m_callbackSelectorChangeTimer.startOneShot(0); |
| return; |
| } |
| if (m_document.frame()) { |
| Vector<String> addedSelectors; |
| Vector<String> removedSelectors; |
| copyToVector(m_addedSelectors, addedSelectors); |
| copyToVector(m_removedSelectors, removedSelectors); |
| m_document.frame()->loader().client()->selectorMatchChanged(addedSelectors, removedSelectors); |
| } |
| m_addedSelectors.clear(); |
| m_removedSelectors.clear(); |
| m_timerExpirations = 0; |
| } |
| |
| void CSSSelectorWatch::updateSelectorMatches(const Vector<String>& removedSelectors, const Vector<String>& addedSelectors) |
| { |
| bool shouldUpdateTimer = false; |
| |
| for (unsigned i = 0; i < removedSelectors.size(); ++i) { |
| const String& selector = removedSelectors[i]; |
| if (!m_matchingCallbackSelectors.remove(selector)) |
| continue; |
| |
| // Count reached 0. |
| shouldUpdateTimer = true; |
| if (m_addedSelectors.contains(selector)) |
| m_addedSelectors.remove(selector); |
| else |
| m_removedSelectors.add(selector); |
| } |
| |
| for (unsigned i = 0; i < addedSelectors.size(); ++i) { |
| const String& selector = addedSelectors[i]; |
| HashCountedSet<String>::AddResult result = m_matchingCallbackSelectors.add(selector); |
| if (!result.isNewEntry) |
| continue; |
| |
| shouldUpdateTimer = true; |
| if (m_removedSelectors.contains(selector)) |
| m_removedSelectors.remove(selector); |
| else |
| m_addedSelectors.add(selector); |
| } |
| |
| if (!shouldUpdateTimer) |
| return; |
| |
| if (m_removedSelectors.isEmpty() && m_addedSelectors.isEmpty()) { |
| if (m_callbackSelectorChangeTimer.isActive()) { |
| m_timerExpirations = 0; |
| m_callbackSelectorChangeTimer.stop(); |
| } |
| } else { |
| m_timerExpirations = 0; |
| if (!m_callbackSelectorChangeTimer.isActive()) |
| m_callbackSelectorChangeTimer.startOneShot(0); |
| } |
| } |
| |
| static bool allCompound(const CSSSelectorList& selectorList) |
| { |
| for (const CSSSelector* selector = selectorList.first(); selector; selector = selectorList.next(selector)) { |
| if (!selector->isCompound()) |
| return false; |
| } |
| return true; |
| } |
| |
| void CSSSelectorWatch::watchCSSSelectors(const Vector<String>& selectors) |
| { |
| m_watchedCallbackSelectors.clear(); |
| CSSParserContext context(UASheetMode); |
| CSSParser parser(context); |
| |
| const CSSProperty callbackProperty(CSSPropertyInternalCallback, CSSPrimitiveValue::createIdentifier(CSSValueInternalPresence)); |
| const RefPtr<StylePropertySet> callbackPropertySet = ImmutableStylePropertySet::create(&callbackProperty, 1, UASheetMode); |
| |
| CSSSelectorList selectorList; |
| for (unsigned i = 0; i < selectors.size(); ++i) { |
| parser.parseSelector(selectors[i], selectorList); |
| if (!selectorList.isValid()) |
| continue; |
| |
| // Only accept Compound Selectors, since they're cheaper to match. |
| if (!allCompound(selectorList)) |
| continue; |
| |
| RefPtr<StyleRule> rule = StyleRule::create(); |
| rule->wrapperAdoptSelectorList(selectorList); |
| rule->setProperties(callbackPropertySet); |
| m_watchedCallbackSelectors.append(rule.release()); |
| } |
| m_document.changedSelectorWatch(); |
| } |
| |
| } // namespace WebCore |