| /* |
| * Copyright 2010 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: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CSS_COMBINE_FILTER_H_ |
| #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_COMBINE_FILTER_H_ |
| |
| #include "net/instaweb/rewriter/public/rewrite_filter.h" |
| #include "net/instaweb/rewriter/public/rewrite_options.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/scoped_ptr.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #include "pagespeed/kernel/util/url_multipart_encoder.h" |
| |
| namespace net_instaweb { |
| |
| class HtmlElement; |
| class HtmlIEDirectiveNode; |
| class RewriteContext; |
| class RewriteDriver; |
| class Statistics; |
| class UrlSegmentEncoder; |
| class Variable; |
| |
| class CssCombineFilter : public RewriteFilter { |
| public: |
| // Statistic names: |
| // # of CSS links which could ideally have been reduced (# CSS links on |
| // original page - 1 for each page). |
| static const char kCssCombineOpportunities[]; |
| // CSS file reduction (Optimally this equals kCssCombineOpportunities). |
| static const char kCssFileCountReduction[]; |
| |
| explicit CssCombineFilter(RewriteDriver* rewrite_driver); |
| virtual ~CssCombineFilter(); |
| |
| static void InitStats(Statistics* statistics); |
| |
| virtual void StartDocumentImpl(); |
| virtual void EndDocument(); |
| virtual void StartElementImpl(HtmlElement* element); |
| virtual void EndElementImpl(HtmlElement* element) {} |
| virtual void Flush(); |
| virtual void DetermineEnabled(GoogleString* disabled_reason); |
| virtual void IEDirective(HtmlIEDirectiveNode* directive); |
| virtual const char* Name() const { return "CssCombine"; } |
| virtual const UrlSegmentEncoder* encoder() const { |
| return &multipart_encoder_; |
| } |
| |
| virtual RewriteContext* MakeRewriteContext(); |
| virtual const char* id() const { return RewriteOptions::kCssCombinerId; } |
| |
| private: |
| class Context; |
| class CssCombiner; |
| |
| CssCombiner* combiner(); |
| void NextCombination(StringPiece debug_help); |
| Context* MakeContext(); |
| |
| scoped_ptr<Context> context_; |
| UrlMultipartEncoder multipart_encoder_; |
| bool end_document_found_; |
| int css_links_; // # of CSS <link>s found on this page. |
| |
| Variable* css_combine_opportunities_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CssCombineFilter); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_REWRITER_PUBLIC_CSS_COMBINE_FILTER_H_ |