Refactoring how conditions without URL attributes are handled.

chrome/browser/extensions/api/declarative_webrequest/webrequest_condition.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_webrequest/webrequest_condition.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/stl_util.h"
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/declarative_webrequest/request_stage.h"
 #include "chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h"
 #include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
-#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
 #include "chrome/common/extensions/matcher/url_matcher.h"
 #include "chrome/common/extensions/matcher/url_matcher_factory.h"
 #include "net/url_request/url_request.h"
 
 namespace keys = extensions::declarative_webrequest_constants;
 
 namespace {
 static extensions::URLMatcherConditionSet::ID g_next_id = 0;
 
 // TODO(battre): improve error messaging to give more meaningful messages
@@ skipping 17 matching lines @@
 //
 // WebRequestCondition
 //
 
 WebRequestCondition::WebRequestCondition(
     scoped_refptr<URLMatcherConditionSet> url_matcher_conditions,
     const WebRequestConditionAttributes& condition_attributes)
     : url_matcher_conditions_(url_matcher_conditions),
       condition_attributes_(condition_attributes),
       applicable_request_stages_(~0) {
-  CHECK(url_matcher_conditions.get());
   for (WebRequestConditionAttributes::const_iterator i =
        condition_attributes_.begin(); i != condition_attributes_.end(); ++i) {
     applicable_request_stages_ &= (*i)->GetStages();
   }
 }
 
 WebRequestCondition::~WebRequestCondition() {}
 
 bool WebRequestCondition::IsFulfilled(
+    URLMatcherConditionSet::ID url_match_trigger,

[battre, 2013/01/15 13:34:10]

I would suggest to remove this line.

[vabr (Chromium), 2013/01/15 14:14:07]

Done.

+    const std::set<URLMatcherConditionSet::ID>& url_matches,
     const WebRequestRule::RequestData& request_data) const {
-  // All condition attributes must be fulfilled for a fulfilled condition.
   if (!(request_data.stage & applicable_request_stages_)) {
     // A condition that cannot be evaluated is considered as violated.
     return false;
   }
 
+  // Check a UrlFilter attribute if present.
+  if (url_matcher_conditions_.get() &&
+      (url_match_trigger != url_matcher_conditions_->id()))

[battre, 2013/01/15 13:34:10]

and change this to
if (url_matcher_conditions_.get() &&
    !ContainsKey(url_matches, url_matcher_conditions_->id)

Then the comment in the function header can be simplified.

The reason for this is that the WebRequestCondition will only have one match
trigger, right?

[vabr (Chromium), 2013/01/15 14:14:07]

Done. (After an off-line chat with Dominic, we decided that the logarithmic
look-up is not too much worse than the constant check, and worth having a
cleaner interface.)

+    return false;
+
+  // All condition attributes must be fulfilled for a fulfilled condition.
   for (WebRequestConditionAttributes::const_iterator i =
        condition_attributes_.begin(); i != condition_attributes_.end(); ++i) {
     if (!(*i)->IsFulfilled(request_data))
       return false;
   }
   return true;
 }
 
 // static
 scoped_ptr<WebRequestCondition> WebRequestCondition::Create(
@@ skipping 46 matching lines @@
       if (attribute.get())
         attributes.push_back(make_linked_ptr(attribute.release()));
     } else {
       *error = base::StringPrintf(kUnknownConditionAttribute,
                                   condition_attribute_name.c_str());
     }
     if (!error->empty())
       return scoped_ptr<WebRequestCondition>(NULL);
   }
 
-  if (!url_matcher_condition_set) {
-    URLMatcherConditionSet::Conditions url_matcher_conditions;
-    url_matcher_conditions.insert(
-        url_matcher_condition_factory->CreateHostPrefixCondition(""));
-    url_matcher_condition_set =
-        new URLMatcherConditionSet(++g_next_id, url_matcher_conditions);
-  }
   scoped_ptr<WebRequestCondition> result(
       new WebRequestCondition(url_matcher_condition_set, attributes));
 
   if (!result->stages()) {
     *error = kConditionCannotBeFulfilled;
     return scoped_ptr<WebRequestCondition>(NULL);
   }
 
   return result.Pass();
 }
 
-
 //
 // WebRequestConditionSet
 //
 
-WebRequestConditionSet::WebRequestConditionSet(
-    const WebRequestConditionSet::Conditions& conditions)
-    : conditions_(conditions) {
-  for (Conditions::iterator i = conditions_.begin(); i != conditions_.end();
-       ++i) {
-    URLMatcherConditionSet::ID trigger_id =
-        (*i)->url_matcher_condition_set_id();
-    match_triggers_[trigger_id] = i->get();
-  }
-}
-
 WebRequestConditionSet::~WebRequestConditionSet() {}
 
 bool WebRequestConditionSet::IsFulfilled(
-    URLMatcherConditionSet::ID url_match,
+    URLMatcherConditionSet::ID url_match_trigger,
+    const std::set<URLMatcherConditionSet::ID>& url_matches,
     const WebRequestRule::RequestData& request_data) const {
-  MatchTriggers::const_iterator trigger = match_triggers_.find(url_match);
-  DCHECK(trigger != match_triggers_.end());
-  DCHECK_EQ(url_match, trigger->second->url_matcher_condition_set_id());
-  return trigger->second->IsFulfilled(request_data);
+  if (url_matches.find(url_match_trigger) == url_matches.end()) {

[battre, 2013/01/15 13:34:10]

change this to "if (url_match_trigger == -1)"?

else: nit: simplify to ContainsKey?

[vabr (Chromium), 2013/01/15 14:14:07]

As described here:
https://codereview.chromium.org/11569007/diff/46001/chrome/browser/extensions...,
the ContainsKey might be back once we add another url attribute, but I'm fine
with using -1 for now.

+    // Invalid trigger -- indication that we should only check conditions
+    // without URL attributes.
+    for (std::vector<const WebRequestCondition*>::const_iterator it =
+         conditions_without_urls_.begin();
+         it != conditions_without_urls_.end(); ++it) {
+      if ((*it)->IsFulfilled(-1, url_matches, request_data))
+        return true;
+    }
+    return false;
+  }
+
+  URLMatcherIdToCondition::const_iterator triggered =
+      match_id_to_condition_.find(url_match_trigger);
+  return (triggered != match_id_to_condition_.end() &&
+          triggered->second->IsFulfilled(url_match_trigger, url_matches,
+                                         request_data));
 }
 
 void WebRequestConditionSet::GetURLMatcherConditionSets(
     URLMatcherConditionSet::Vector* condition_sets) const {
   for (Conditions::const_iterator i = conditions_.begin();
        i != conditions_.end(); ++i) {
-    condition_sets->push_back((*i)->url_matcher_condition_set());
+    scoped_refptr<URLMatcherConditionSet> set =
+        (*i)->url_matcher_condition_set();
+    if (set.get())
+      condition_sets->push_back(set);
   }
 }
 
 // static
 scoped_ptr<WebRequestConditionSet> WebRequestConditionSet::Create(
     URLMatcherConditionFactory* url_matcher_condition_factory,
     const AnyVector& conditions,
     std::string* error) {
-  WebRequestConditionSet::Conditions result;
+  Conditions result;
 
   for (AnyVector::const_iterator i = conditions.begin();
        i != conditions.end(); ++i) {
     CHECK(i->get());
     scoped_ptr<WebRequestCondition> condition =
         WebRequestCondition::Create(url_matcher_condition_factory,
                                     (*i)->value(), error);
     if (!error->empty())
       return scoped_ptr<WebRequestConditionSet>(NULL);
     result.push_back(make_linked_ptr(condition.release()));
   }
 
-  return scoped_ptr<WebRequestConditionSet>(new WebRequestConditionSet(result));
+  URLMatcherIdToCondition match_id_to_condition;
+  std::vector<const WebRequestCondition*> conditions_without_urls;
+
+  for (Conditions::const_iterator i = result.begin(); i != result.end(); ++i) {
+    const URLMatcherConditionSet* set = (*i)->url_matcher_condition_set().get();
+    if (set) {
+      URLMatcherConditionSet::ID id = set->id();
+      match_id_to_condition[id] = i->get();
+    } else {
+      conditions_without_urls.push_back(i->get());
+    }
+  }
+
+  return make_scoped_ptr(new WebRequestConditionSet(
+      result, match_id_to_condition, conditions_without_urls));
 }
 
+bool WebRequestConditionSet::HasConditionsWithoutUrls() const {
+  return !conditions_without_urls_.empty();
+}
+
+WebRequestConditionSet::WebRequestConditionSet(
+    const Conditions& conditions,
+    const URLMatcherIdToCondition& match_id_to_condition,
+    const std::vector<const WebRequestCondition*>& conditions_without_urls)
+    : match_id_to_condition_(match_id_to_condition),
+      conditions_(conditions),
+      conditions_without_urls_(conditions_without_urls) {}
+
 }  // namespace extensions