Implement rules removal for WebRequestRulesRegistry

chrome/browser/extensions/api/declarative/url_matcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/declarative/url_matcher.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/logging.h"
@@ skipping 326 matching lines @@
   while (i != pattern_singletons_.end()) {
     if (used_patterns.find((*i)->id()) != used_patterns.end()) {
       ++i;
     } else {
       delete *i;
       pattern_singletons_.erase(i++);
     }
   }
 }
 
+bool URLMatcherConditionFactory::IsEmpty() const {
+  return pattern_singletons_.empty();
+}
+
 URLMatcherCondition URLMatcherConditionFactory::CreateCondition(
     URLMatcherCondition::Criterion criterion,
     const std::string& pattern) {
   SubstringPattern search_pattern(pattern, 0);
   PatternSingletons::const_iterator iter =
       pattern_singletons_.find(&search_pattern);
   if (iter != pattern_singletons_.end()) {
     return URLMatcherCondition(criterion, *iter);
   } else {
     SubstringPattern* new_pattern =
@@ skipping 116 matching lines @@
     for (std::set<URLMatcherConditionSet::ID>::const_iterator j =
         condition_sets.begin(); j != condition_sets.end(); ++j) {
       if (url_matcher_condition_sets_[*j].IsMatch(matches, url))
         result.insert(*j);
     }
   }
 
   return result;
 }
 
+bool URLMatcher::IsEmpty() const {
+  return condition_factory_.IsEmpty() &&
+      url_matcher_condition_sets_.empty() &&
+      substring_match_triggers_.empty() &&
+      full_url_matcher_.IsEmpty() &&
+      url_component_matcher_.IsEmpty() &&
+      registered_full_url_patterns_.empty() &&
+      registered_url_component_patterns_.empty();
+}
+
 void URLMatcher::UpdateSubstringSetMatcher(bool full_url_conditions) {
   // The purpose of |full_url_conditions| is just that we need to execute
   // the same logic once for Full URL searches and once for URL Component
   // searches (see URLMatcherConditionFactory).
 
   // Determine which patterns need to be registered when this function
   // terminates.
   std::set<const SubstringPattern*> new_patterns;
   for (URLMatcherConditionSets::const_iterator condition_set_iter =
       url_matcher_condition_sets_.begin();
@@ skipping 111 matching lines @@
 }
 
 void URLMatcher::UpdateInternalDatastructures() {
   UpdateSubstringSetMatcher(false);
   UpdateSubstringSetMatcher(true);
   UpdateTriggers();
   UpdateConditionFactory();
 }
 
 }  // namespace extensions