| /* |
| * 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: sriharis@google.com (Srihari Sukumaran) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_SUPPORT_NOSCRIPT_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_SUPPORT_NOSCRIPT_FILTER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/html/empty_html_filter.h" |
| |
| namespace net_instaweb { |
| |
| class HtmlElement; |
| class RewriteDriver; |
| |
| // Inserts a noscript tag as the first element of body. This noscript redirects |
| // to "ModPagespeed=off" to prevent breakage when pages rewritten by filters |
| // that depend on script execution (such as lazyload_images) are rendered on |
| // browsers with script execution disabled. |
| class SupportNoscriptFilter : public EmptyHtmlFilter { |
| public: |
| explicit SupportNoscriptFilter(RewriteDriver* rewrite_driver); |
| virtual ~SupportNoscriptFilter(); |
| |
| virtual void DetermineEnabled(GoogleString* disabled_reason); |
| |
| virtual void StartElement(HtmlElement* element); |
| virtual const char* Name() const { return "SupportNoscript"; } |
| |
| private: |
| bool IsAnyFilterRequiringScriptExecutionEnabled() const; |
| RewriteDriver* rewrite_driver_; // We do not own this. |
| bool should_insert_noscript_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SupportNoscriptFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_SUPPORT_NOSCRIPT_FILTER_H_ |