Page Speed Optimization Libraries  1.8.31.3
net/instaweb/rewriter/public/js_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_JS_INLINE_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_JS_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/resource.h"
00027 #include "net/instaweb/rewriter/public/rewrite_driver.h"
00028 #include "net/instaweb/rewriter/public/rewrite_options.h"
00029 #include "net/instaweb/rewriter/public/script_tag_scanner.h"
00030 #include "net/instaweb/util/public/basictypes.h"
00031 #include "net/instaweb/util/public/string_util.h"
00032 
00033 namespace net_instaweb {
00034 class HtmlElement;
00035 class HtmlCharactersNode;
00036 class Statistics;
00037 class Variable;
00038 
00040 class JsInlineFilter : public CommonFilter {
00041  public:
00042   static const char kNumJsInlined[];
00043   explicit JsInlineFilter(RewriteDriver* driver);
00044   virtual ~JsInlineFilter();
00045 
00046   virtual void StartDocumentImpl();
00047   virtual void EndDocument();
00048   virtual void StartElementImpl(HtmlElement* element);
00049   virtual void EndElementImpl(HtmlElement* element);
00050   virtual void Characters(HtmlCharactersNode* characters);
00051   virtual const char* Name() const { return "InlineJs"; }
00055   virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain()
00056       const {
00057     return driver()->options()->HasInlineUnauthorizedResourceType(
00058                semantic_type::kScript) ?
00059            RewriteDriver::kInlineUnauthorizedResources :
00060            RewriteDriver::kInlineOnlyAuthorizedResources;
00061   }
00062   virtual bool IntendedForInlining() const { return true; }
00063 
00064   static void InitStats(Statistics* statistics);
00065 
00066  private:
00067   class Context;
00068   friend class Context;
00069 
00070   bool ShouldInline(const ResourcePtr& resource) const;
00071   void RenderInline(const ResourcePtr& resource, const StringPiece& text,
00072                     HtmlElement* element);
00073 
00074   const size_t size_threshold_bytes_;
00075   ScriptTagScanner script_tag_scanner_;
00076 
00082   bool should_inline_;
00083 
00084   Variable* num_js_inlined_;
00085 
00086   DISALLOW_COPY_AND_ASSIGN(JsInlineFilter);
00087 };
00088 
00089 }  
00090 
00091 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_JS_INLINE_FILTER_H_
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