| /* |
| * 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: pulkitg@google.com (Pulkit Goyal) |
| // |
| // Contains the implementation of the DeferIframeFilter which defers the iframe |
| // using JsDeferDisabledJavascriptFilter. This filter should be called before |
| // JsDeferDisabledJavascriptFilter. This filter renames all the iframe tags to |
| // pagespeed_iframe and add a script which converts pagespeed_iframe back to |
| // iframe and the added script is deferred by JsDeferDisabledJavascriptFilter. |
| // |
| // Html input to this filter looks like: |
| // <html> |
| // <head> |
| // </head> |
| // <body> |
| // <iframe src="1.html"></iframe> |
| // </body> |
| // </html> |
| // |
| // Output for the above html will be: |
| // <html> |
| // <head> |
| // </head> |
| // <body> |
| // <script> |
| // defer_iframe script. |
| // </script> |
| // <pagespeed_iframe src="1.html"> |
| // <script> |
| // Script which changes above pagespeed_iframe tag name to iframe. |
| // </script> |
| // </pagespeed_iframe> |
| // </body> |
| // </html> |
| // |
| // Above script which converts pagespeed_iframe to iframe will be deferred |
| // by JsDeferDisabledJavascriptFilter, hence loading of iframe is also deferred. |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_DEFER_IFRAME_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_DEFER_IFRAME_FILTER_H_ |
| |
| #include "net/instaweb/rewriter/public/common_filter.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| |
| namespace net_instaweb { |
| |
| class HtmlElement; |
| class RewriteDriver; |
| class StaticAssetManager; |
| |
| class DeferIframeFilter : public CommonFilter { |
| public: |
| static const char kDeferIframeInit[]; |
| static const char kDeferIframeIframeJs[]; |
| explicit DeferIframeFilter(RewriteDriver* driver); |
| ~DeferIframeFilter(); |
| |
| virtual void StartDocumentImpl(); |
| virtual void StartElementImpl(HtmlElement* element); |
| virtual void EndElementImpl(HtmlElement* element); |
| virtual void DetermineEnabled(GoogleString* disabled_reason); |
| |
| virtual const char* Name() const { return "DeferIframe"; } |
| |
| private: |
| StaticAssetManager* static_asset_manager_; |
| bool script_inserted_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DeferIframeFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_DEFER_IFRAME_FILTER_H_ |
