[WIP] Streaming CSS parser

third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp

 /*
  * Copyright (C) 2010, 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 220 matching lines @@
 
 void StyleSheetHandler::startRuleBody(unsigned offset) {
   m_currentRuleData = nullptr;
   ASSERT(!m_currentRuleDataStack.isEmpty());
   if (m_parsedText[offset] == '{')
     ++offset;  // Skip the rule body opening brace.
   m_currentRuleDataStack.back()->ruleBodyRange.start = offset;
 }
 
 void StyleSheetHandler::endRuleBody(unsigned offset) {
+  // Pop off data for a previous invalid rule.
+  if (m_currentRuleData) {
+    m_currentRuleData = nullptr;
+    m_currentRuleDataStack.pop_back();
+  }
+
   ASSERT(!m_currentRuleDataStack.isEmpty());
   m_currentRuleDataStack.back()->ruleBodyRange.end = offset;
   RefPtr<CSSRuleSourceData> rule = popRuleData();
 
   fixUnparsedPropertyRanges(rule.get());
   addNewRuleToSourceTree(rule.release());
 }
 
 void StyleSheetHandler::addNewRuleToSourceTree(
     PassRefPtr<CSSRuleSourceData> rule) {
@@ skipping 196 matching lines @@
 bool verifyKeyframeKeyText(Document* document, const String& keyText) {
   StyleSheetContents* styleSheet =
       StyleSheetContents::create(strictCSSParserContext());
   RuleSourceDataList sourceData;
   String text = "@keyframes boguzAnim { " + keyText +
                 " { -webkit-boguz-propertee : none; } }";
   StyleSheetHandler handler(text, document, &sourceData);
   CSSParser::parseSheetForInspector(parserContextForDocument(document),
                                     styleSheet, text, handler);
 
-  // Exactly two should be parsed.
+  // Exactly one should be parsed.
   unsigned ruleCount = sourceData.size();
-  if (ruleCount != 2 || sourceData.at(0)->type != StyleRule::Keyframes ||
-      sourceData.at(1)->type != StyleRule::Keyframe)
+  if (ruleCount != 1 || sourceData.at(0)->type != StyleRule::Keyframes)
+    return false;
+
+  const CSSRuleSourceData& keyframesData = *sourceData.at(0);
+  if (keyframesData.childRules.size() != 1 ||
+      keyframesData.childRules.at(0)->type != StyleRule::Keyframe)
     return false;
 
   // Exactly one property should be in keyframe rule.
   Vector<CSSPropertySourceData>& propertyData =
-      sourceData.at(1)->styleSourceData->propertyData;
+      keyframesData.childRules.at(0)->styleSourceData->propertyData;
   unsigned propertyCount = propertyData.size();
   if (propertyCount != 1)
     return false;
 
   return true;
 }
 
 bool verifySelectorText(Document* document, const String& selectorText) {
   DEFINE_STATIC_LOCAL(String, bogusPropertyName, ("-webkit-boguz-propertee"));
   StyleSheetContents* styleSheet =
@@ skipping 1527 matching lines @@
   return m_element->getAttribute("style").getString();
 }
 
 DEFINE_TRACE(InspectorStyleSheetForInlineStyle) {
   visitor->trace(m_element);
   visitor->trace(m_inspectorStyle);
   InspectorStyleSheetBase::trace(visitor);
 }
 
 }  // namespace blink