Page Speed Optimization Libraries  1.7.30.2
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 
00039 class CssInlineFilter : public CommonFilter {
00040  public:
00041   explicit CssInlineFilter(RewriteDriver* driver);
00042   virtual ~CssInlineFilter();
00043 
00044   virtual void StartDocumentImpl();
00045   virtual void StartElementImpl(HtmlElement* element) {}
00046   virtual void EndElementImpl(HtmlElement* element);
00047   virtual const char* Name() const { return "InlineCss"; }
00051   virtual bool AllowUnauthorizedDomain() const { return true; }
00052 
00053  protected:
00056   void set_id(const char* id) { id_ = id; }
00057 
00060   virtual ResourcePtr CreateResource(const char* url);
00061 
00062  private:
00063   class Context;
00064   friend class Context;
00065 
00066   bool ShouldInline(const ResourcePtr& resource,
00067                     const StringPiece& attrs_attribute) const;
00068   void RenderInline(const ResourcePtr& resource, const CachedResult& cached,
00069                     const GoogleUrl& base_url, const StringPiece& text,
00070                     HtmlElement* element);
00071 
00072   const char* id_; 
00073   const size_t size_threshold_bytes_;
00074 
00075   GoogleString domain_;
00076   CssTagScanner css_tag_scanner_;
00077 
00078   DISALLOW_COPY_AND_ASSIGN(CssInlineFilter);
00079 };
00080 
00081 }  
00082 
00083 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_INLINE_FILTER_H_
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