| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: mmohabey@google.com (Megha Mohabey) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_DETERMINISTIC_JS_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_DETERMINISTIC_JS_FILTER_H_ |
| |
| #include "net/instaweb/rewriter/public/common_filter.h" |
| #include "net/instaweb/rewriter/public/rewrite_driver.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/html/html_element.h" |
| |
| namespace net_instaweb { |
| |
| // Injects javascript at the beginning of the head tag to make it deterministic. |
| // The JS redefines functions like Math.random and Date. This filter is useful |
| // for testing and measurement but does not provide any latency gains. A head |
| // element is added if it is not already present in the html. |
| class DeterministicJsFilter : public CommonFilter { |
| public: |
| explicit DeterministicJsFilter(RewriteDriver* driver); |
| virtual ~DeterministicJsFilter(); |
| |
| virtual void StartDocumentImpl(); |
| virtual void StartElementImpl(HtmlElement* element); |
| virtual void EndElementImpl(HtmlElement* element) { } |
| virtual const char* Name() const { return "DeterministicJs"; } |
| |
| private: |
| bool found_head_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DeterministicJsFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_DETERMINISTIC_JS_FILTER_H_ |