Page Speed Optimization Libraries  1.7.30.3
net/instaweb/rewriter/public/simple_text_filter.h
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00001 /*
00002  * Copyright 2011 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_SIMPLE_TEXT_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_SIMPLE_TEXT_FILTER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/html_element.h"
00023 #include "net/instaweb/rewriter/public/output_resource_kind.h"
00024 #include "net/instaweb/rewriter/public/resource.h"  
00025 #include "net/instaweb/rewriter/public/server_context.h"
00026 #include "net/instaweb/rewriter/public/resource_slot.h"
00027 #include "net/instaweb/rewriter/public/rewrite_filter.h"
00028 #include "net/instaweb/rewriter/public/single_rewrite_context.h"
00029 #include "net/instaweb/util/public/basictypes.h"
00030 #include "net/instaweb/util/public/string.h"
00031 #include "net/instaweb/util/public/string_util.h"
00032 
00033 namespace net_instaweb {
00034 
00035 class RewriteContext;
00036 class RewriteDriver;
00037 
00046 class SimpleTextFilter : public RewriteFilter {
00047  public:
00048   class Rewriter : public RefCounted<Rewriter> {
00049    public:
00050     Rewriter() {}
00051     virtual bool RewriteText(const StringPiece& url,
00052                              const StringPiece& in,
00053                              GoogleString* out,
00054                              ServerContext* server_context) = 0;
00055     virtual HtmlElement::Attribute* FindResourceAttribute(
00056         HtmlElement* element) = 0;
00057 
00058     virtual OutputResourceKind kind() const = 0;
00059     virtual const char* id() const = 0;
00060     virtual const char* name() const = 0;
00061 
00063     virtual bool OptimizationOnly() const { return true; }
00064 
00065    protected:
00066     REFCOUNT_FRIEND_DECLARATION(Rewriter);
00067     virtual ~Rewriter();
00068 
00069    private:
00070     DISALLOW_COPY_AND_ASSIGN(Rewriter);
00071   };
00072 
00073   typedef RefCountedPtr<Rewriter> RewriterPtr;
00074 
00075   class Context : public SingleRewriteContext {
00076    public:
00077     Context(const RewriterPtr& rewriter, RewriteDriver* driver,
00078             RewriteContext* parent);
00079     virtual ~Context();
00080     virtual void RewriteSingle(
00081         const ResourcePtr& input, const OutputResourcePtr& output);
00082 
00083    protected:
00084     virtual const char* id() const { return rewriter_->id(); }
00085     virtual OutputResourceKind kind() const { return rewriter_->kind(); }
00086     virtual bool OptimizationOnly() const {
00087       return rewriter_->OptimizationOnly();
00088     }
00089 
00090    private:
00091     RewriterPtr rewriter_;
00092 
00093     DISALLOW_COPY_AND_ASSIGN(Context);
00094   };
00095 
00096   SimpleTextFilter(Rewriter* rewriter, RewriteDriver* driver);
00097   virtual ~SimpleTextFilter();
00098 
00099   virtual void StartDocumentImpl() {}
00100   virtual void EndElementImpl(HtmlElement* element) {}
00101   virtual void StartElementImpl(HtmlElement* element);
00102 
00103   virtual RewriteContext* MakeRewriteContext();
00104   virtual RewriteContext* MakeNestedRewriteContext(
00105       RewriteContext* parent, const ResourceSlotPtr& slot);
00106 
00107  protected:
00108   virtual const char* id() const { return rewriter_->id(); }
00109   virtual const char* Name() const { return rewriter_->name(); }
00110   virtual bool ComputeOnTheFly() const {
00111     return rewriter_->kind() == kOnTheFlyResource;
00112   }
00113 
00114  private:
00115   RewriterPtr rewriter_;
00116 
00117   DISALLOW_COPY_AND_ASSIGN(SimpleTextFilter);
00118 };
00119 
00120 }  
00121 
00122 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_SIMPLE_TEXT_FILTER_H_
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