Page Speed Optimization Libraries  1.7.30.3
net/instaweb/rewriter/public/css_inline_filter.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CSS_INLINE_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_INLINE_FILTER_H_
00021 
00022 #include <cstddef>
00023 
00024 #include "net/instaweb/rewriter/public/common_filter.h"
00025 #include "net/instaweb/rewriter/public/css_tag_scanner.h"
00026 #include "net/instaweb/rewriter/public/resource.h"
00027 #include "net/instaweb/util/public/basictypes.h"
00028 #include "net/instaweb/util/public/string.h"
00029 #include "net/instaweb/util/public/string_util.h"
00030 
00031 namespace net_instaweb {
00032 
00033 class CachedResult;
00034 class GoogleUrl;
00035 class HtmlElement;
00036 class RewriteDriver;
00037 class Statistics;
00038 class Variable;
00039 
00041 class CssInlineFilter : public CommonFilter {
00042  public:
00043   static const char kNumCssInlined[];
00044 
00045   explicit CssInlineFilter(RewriteDriver* driver);
00046   virtual ~CssInlineFilter();
00047 
00048   virtual void StartDocumentImpl();
00049   virtual void StartElementImpl(HtmlElement* element) {}
00050   virtual void EndElementImpl(HtmlElement* element);
00051   virtual const char* Name() const { return "InlineCss"; }
00055   virtual bool AllowUnauthorizedDomain() const { return true; }
00056 
00057   static void InitStats(Statistics* statistics);
00058 
00059  protected:
00062   void set_id(const char* id) { id_ = id; }
00063 
00066   virtual ResourcePtr CreateResource(const char* url);
00067 
00068  private:
00069   class Context;
00070   friend class Context;
00071 
00072   bool ShouldInline(const ResourcePtr& resource,
00073                     const StringPiece& attrs_attribute) const;
00074   void RenderInline(const ResourcePtr& resource, const CachedResult& cached,
00075                     const GoogleUrl& base_url, const StringPiece& text,
00076                     HtmlElement* element);
00077 
00078   const char* id_; 
00079   const size_t size_threshold_bytes_;
00080 
00081   GoogleString domain_;
00082   CssTagScanner css_tag_scanner_;
00083 
00084   Variable* num_css_inlined_;
00085 
00086   DISALLOW_COPY_AND_ASSIGN(CssInlineFilter);
00087 };
00088 
00089 }  
00090 
00091 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_INLINE_FILTER_H_
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