| /* |
| * 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 "core/dom/CSSSelectorWatch.h" |
| |
| #include "core/css/StylePropertySet.h" |
| #include "core/css/parser/CSSParser.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/ExecutionContext.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/loader/FrameLoaderClient.h" |
| #include "core/style/StyleRareNonInheritedData.h" |
| |
| namespace blink { |
| |
| // 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 = fromIfExists(document); |
| if (!watch) { |
| watch = new CSSSelectorWatch(document); |
| WillBeHeapSupplement<Document>::provideTo(document, kSupplementName, adoptPtrWillBeNoop(watch)); |
| } |
| return *watch; |
| } |
| |
| CSSSelectorWatch* CSSSelectorWatch::fromIfExists(Document& document) |
| { |
| return static_cast<CSSSelectorWatch*>(WillBeHeapSupplement<Document>::from(document, kSupplementName)); |
| } |
| |
| 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, BLINK_FROM_HERE); |
| return; |
| } |
| if (document().frame()) { |
| Vector<String> addedSelectors; |
| Vector<String> removedSelectors; |
| copyToVector(m_addedSelectors, addedSelectors); |
| copyToVector(m_removedSelectors, removedSelectors); |
| 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, BLINK_FROM_HERE); |
| } |
| } |
| |
| 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(); |
| |
| const RefPtrWillBeRawPtr<StylePropertySet> callbackPropertySet = ImmutableStylePropertySet::create(nullptr, 0, UASheetMode); |
| |
| for (unsigned i = 0; i < selectors.size(); ++i) { |
| CSSSelectorList selectorList = CSSParser::parseSelector(CSSParserContext(UASheetMode, 0), selectors[i]); |
| if (!selectorList.isValid()) |
| continue; |
| |
| // Only accept Compound Selectors, since they're cheaper to match. |
| if (!allCompound(selectorList)) |
| continue; |
| |
| m_watchedCallbackSelectors.append(StyleRule::create(std::move(selectorList), callbackPropertySet)); |
| } |
| document().changedSelectorWatch(); |
| } |
| |
| DEFINE_TRACE(CSSSelectorWatch) |
| { |
| visitor->trace(m_watchedCallbackSelectors); |
| visitor->trace(m_document); |
| WillBeHeapSupplement<Document>::trace(visitor); |
| } |
| |
| } // namespace blink |