Page Speed Optimization Libraries  1.7.30.4
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/http/public/semantic_type.h"
00025 #include "net/instaweb/rewriter/public/common_filter.h"
00026 #include "net/instaweb/rewriter/public/css_tag_scanner.h"
00027 #include "net/instaweb/rewriter/public/resource.h"
00028 #include "net/instaweb/rewriter/public/rewrite_driver.h"
00029 #include "net/instaweb/rewriter/public/rewrite_options.h"
00030 #include "net/instaweb/util/public/basictypes.h"
00031 #include "net/instaweb/util/public/string.h"
00032 #include "net/instaweb/util/public/string_util.h"
00033 
00034 namespace net_instaweb {
00035 
00036 class CachedResult;
00037 class GoogleUrl;
00038 class HtmlElement;
00039 class Statistics;
00040 class Variable;
00041 
00043 class CssInlineFilter : public CommonFilter {
00044  public:
00045   static const char kNumCssInlined[];
00046 
00047   explicit CssInlineFilter(RewriteDriver* driver);
00048   virtual ~CssInlineFilter();
00049 
00050   virtual void StartDocumentImpl();
00051   virtual void StartElementImpl(HtmlElement* element) {}
00052   virtual void EndElementImpl(HtmlElement* element);
00053   virtual const char* Name() const { return "InlineCss"; }
00057   virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain()
00058       const {
00059     return driver_->options()->HasInlineUnauthorizedResourceType(
00060                semantic_type::kStylesheet) ?
00061            RewriteDriver::kInlineUnauthorizedResources :
00062            RewriteDriver::kInlineOnlyAuthorizedResources;
00063   }
00064   virtual bool IntendedForInlining() const { return true; }
00065 
00066   static void InitStats(Statistics* statistics);
00067   static bool HasClosingStyleTag(StringPiece contents);
00068 
00069  protected:
00072   void set_id(const char* id) { id_ = id; }
00073 
00076   virtual ResourcePtr CreateResource(const char* url);
00077 
00078  private:
00079   class Context;
00080   friend class Context;
00081 
00082   bool ShouldInline(const ResourcePtr& resource,
00083                     const StringPiece& attrs_attribute) const;
00084   void RenderInline(const ResourcePtr& resource, const CachedResult& cached,
00085                     const GoogleUrl& base_url, const StringPiece& text,
00086                     HtmlElement* element);
00087 
00088   const char* id_; 
00089   const size_t size_threshold_bytes_;
00090 
00091   GoogleString domain_;
00092   CssTagScanner css_tag_scanner_;
00093 
00094   Variable* num_css_inlined_;
00095 
00096   DISALLOW_COPY_AND_ASSIGN(CssInlineFilter);
00097 };
00098 
00099 }  
00100 
00101 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_INLINE_FILTER_H_
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